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Commit | Line | Data |
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0628567a | 1 | /* execute_cmd.c -- Execute a COMMAND structure. */ |
726f6388 | 2 | |
3185942a | 3 | /* Copyright (C) 1987-2009 Free Software Foundation, Inc. |
726f6388 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
726f6388 | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
726f6388 JA |
16 | |
17 | You should have received a copy of the GNU General Public License | |
3185942a JA |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. |
19 | */ | |
20 | ||
ccc6cda3 JA |
21 | #include "config.h" |
22 | ||
23 | #if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX) | |
726f6388 | 24 | #pragma alloca |
ccc6cda3 | 25 | #endif /* _AIX && RISC6000 && !__GNUC__ */ |
726f6388 JA |
26 | |
27 | #include <stdio.h> | |
f73dda09 | 28 | #include "chartypes.h" |
726f6388 | 29 | #include "bashtypes.h" |
b80f6443 | 30 | #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) |
cce855bc JA |
31 | # include <sys/file.h> |
32 | #endif | |
726f6388 JA |
33 | #include "filecntl.h" |
34 | #include "posixstat.h" | |
35 | #include <signal.h> | |
cce855bc JA |
36 | #ifndef _MINIX |
37 | # include <sys/param.h> | |
38 | #endif | |
726f6388 | 39 | |
ccc6cda3 JA |
40 | #if defined (HAVE_UNISTD_H) |
41 | # include <unistd.h> | |
42 | #endif | |
43 | ||
bb70624e | 44 | #include "posixtime.h" |
ccc6cda3 | 45 | |
cce855bc | 46 | #if defined (HAVE_SYS_RESOURCE_H) && !defined (RLIMTYPE) |
ccc6cda3 JA |
47 | # include <sys/resource.h> |
48 | #endif | |
49 | ||
50 | #if defined (HAVE_SYS_TIMES_H) && defined (HAVE_TIMES) | |
51 | # include <sys/times.h> | |
726f6388 JA |
52 | #endif |
53 | ||
726f6388 JA |
54 | #include <errno.h> |
55 | ||
56 | #if !defined (errno) | |
57 | extern int errno; | |
58 | #endif | |
59 | ||
0001803f CR |
60 | #define NEED_FPURGE_DECL |
61 | ||
ccc6cda3 | 62 | #include "bashansi.h" |
b80f6443 | 63 | #include "bashintl.h" |
726f6388 | 64 | |
ccc6cda3 | 65 | #include "memalloc.h" |
726f6388 | 66 | #include "shell.h" |
d166f048 | 67 | #include <y.tab.h> /* use <...> so we pick it up from the build directory */ |
726f6388 | 68 | #include "flags.h" |
ccc6cda3 JA |
69 | #include "builtins.h" |
70 | #include "hashlib.h" | |
726f6388 JA |
71 | #include "jobs.h" |
72 | #include "execute_cmd.h" | |
cce855bc JA |
73 | #include "findcmd.h" |
74 | #include "redir.h" | |
ccc6cda3 JA |
75 | #include "trap.h" |
76 | #include "pathexp.h" | |
d166f048 | 77 | #include "hashcmd.h" |
726f6388 | 78 | |
cce855bc JA |
79 | #if defined (COND_COMMAND) |
80 | # include "test.h" | |
81 | #endif | |
82 | ||
726f6388 JA |
83 | #include "builtins/common.h" |
84 | #include "builtins/builtext.h" /* list of builtins */ | |
85 | ||
f73dda09 | 86 | #include <glob/strmatch.h> |
726f6388 JA |
87 | #include <tilde/tilde.h> |
88 | ||
89 | #if defined (BUFFERED_INPUT) | |
90 | # include "input.h" | |
91 | #endif | |
92 | ||
ccc6cda3 JA |
93 | #if defined (ALIAS) |
94 | # include "alias.h" | |
95 | #endif | |
96 | ||
97 | #if defined (HISTORY) | |
98 | # include "bashhist.h" | |
99 | #endif | |
100 | ||
726f6388 | 101 | extern int posixly_correct; |
f73dda09 | 102 | extern int expand_aliases; |
3185942a JA |
103 | extern int autocd; |
104 | extern int breaking, continuing, loop_level; | |
0001803f | 105 | extern int parse_and_execute_level, running_trap, sourcelevel; |
f73dda09 | 106 | extern int command_string_index, line_number; |
726f6388 | 107 | extern int dot_found_in_search; |
ccc6cda3 | 108 | extern int already_making_children; |
b80f6443 | 109 | extern int tempenv_assign_error; |
726f6388 JA |
110 | extern char *the_printed_command, *shell_name; |
111 | extern pid_t last_command_subst_pid; | |
f73dda09 | 112 | extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin; |
726f6388 | 113 | extern char **subshell_argv, **subshell_envp; |
ccc6cda3 | 114 | extern int subshell_argc; |
f73dda09 | 115 | #if 0 |
ccc6cda3 | 116 | extern char *glob_argv_flags; |
f73dda09 | 117 | #endif |
726f6388 | 118 | |
f73dda09 | 119 | extern int close __P((int)); |
726f6388 JA |
120 | |
121 | /* Static functions defined and used in this file. */ | |
f73dda09 JA |
122 | static void close_pipes __P((int, int)); |
123 | static void do_piping __P((int, int)); | |
124 | static void bind_lastarg __P((char *)); | |
125 | static int shell_control_structure __P((enum command_type)); | |
126 | static void cleanup_redirects __P((REDIRECT *)); | |
127 | ||
128 | #if defined (JOB_CONTROL) | |
129 | static int restore_signal_mask __P((sigset_t *)); | |
130 | #endif | |
ccc6cda3 | 131 | |
f73dda09 JA |
132 | static void async_redirect_stdin __P((void)); |
133 | ||
134 | static int builtin_status __P((int)); | |
135 | ||
136 | static int execute_for_command __P((FOR_COM *)); | |
ccc6cda3 | 137 | #if defined (SELECT_COMMAND) |
f73dda09 JA |
138 | static int print_index_and_element __P((int, int, WORD_LIST *)); |
139 | static void indent __P((int, int)); | |
140 | static void print_select_list __P((WORD_LIST *, int, int, int)); | |
7117c2d2 | 141 | static char *select_query __P((WORD_LIST *, int, char *, int)); |
f73dda09 | 142 | static int execute_select_command __P((SELECT_COM *)); |
ccc6cda3 | 143 | #endif |
cce855bc | 144 | #if defined (DPAREN_ARITHMETIC) |
f73dda09 | 145 | static int execute_arith_command __P((ARITH_COM *)); |
cce855bc JA |
146 | #endif |
147 | #if defined (COND_COMMAND) | |
f73dda09 JA |
148 | static int execute_cond_node __P((COND_COM *)); |
149 | static int execute_cond_command __P((COND_COM *)); | |
cce855bc | 150 | #endif |
d166f048 | 151 | #if defined (COMMAND_TIMING) |
f73dda09 JA |
152 | static int mkfmt __P((char *, int, int, time_t, int)); |
153 | static void print_formatted_time __P((FILE *, char *, | |
154 | time_t, int, time_t, int, | |
155 | time_t, int, int)); | |
156 | static int time_command __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
d166f048 | 157 | #endif |
bb70624e | 158 | #if defined (ARITH_FOR_COMMAND) |
7117c2d2 | 159 | static intmax_t eval_arith_for_expr __P((WORD_LIST *, int *)); |
f73dda09 | 160 | static int execute_arith_for_command __P((ARITH_FOR_COM *)); |
bb70624e | 161 | #endif |
f73dda09 JA |
162 | static int execute_case_command __P((CASE_COM *)); |
163 | static int execute_while_command __P((WHILE_COM *)); | |
164 | static int execute_until_command __P((WHILE_COM *)); | |
165 | static int execute_while_or_until __P((WHILE_COM *, int)); | |
166 | static int execute_if_command __P((IF_COM *)); | |
95732b49 | 167 | static int execute_null_command __P((REDIRECT *, int, int, int)); |
f73dda09 JA |
168 | static void fix_assignment_words __P((WORD_LIST *)); |
169 | static int execute_simple_command __P((SIMPLE_COM *, int, int, int, struct fd_bitmap *)); | |
170 | static int execute_builtin __P((sh_builtin_func_t *, WORD_LIST *, int, int)); | |
171 | static int execute_function __P((SHELL_VAR *, WORD_LIST *, int, struct fd_bitmap *, int, int)); | |
172 | static int execute_builtin_or_function __P((WORD_LIST *, sh_builtin_func_t *, | |
173 | SHELL_VAR *, | |
174 | REDIRECT *, struct fd_bitmap *, int)); | |
175 | static void execute_subshell_builtin_or_function __P((WORD_LIST *, REDIRECT *, | |
176 | sh_builtin_func_t *, | |
177 | SHELL_VAR *, | |
178 | int, int, int, | |
179 | struct fd_bitmap *, | |
180 | int)); | |
181 | static void execute_disk_command __P((WORD_LIST *, REDIRECT *, char *, | |
182 | int, int, int, struct fd_bitmap *, int)); | |
183 | ||
184 | static char *getinterp __P((char *, int, int *)); | |
185 | static void initialize_subshell __P((void)); | |
186 | static int execute_in_subshell __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
3185942a JA |
187 | #if defined (COPROCESS_SUPPORT) |
188 | static int execute_coproc __P((COMMAND *, int, int, struct fd_bitmap *)); | |
189 | #endif | |
f73dda09 JA |
190 | |
191 | static int execute_pipeline __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
192 | ||
193 | static int execute_connection __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
194 | ||
195 | static int execute_intern_function __P((WORD_DESC *, COMMAND *)); | |
196 | ||
d166f048 JA |
197 | /* Set to 1 if fd 0 was the subject of redirection to a subshell. Global |
198 | so that reader_loop can set it to zero before executing a command. */ | |
199 | int stdin_redir; | |
726f6388 JA |
200 | |
201 | /* The name of the command that is currently being executed. | |
202 | `test' needs this, for example. */ | |
203 | char *this_command_name; | |
204 | ||
b80f6443 JA |
205 | /* The printed representation of the currently-executing command (same as |
206 | the_printed_command), except when a trap is being executed. Useful for | |
207 | a debugger to know where exactly the program is currently executing. */ | |
208 | char *the_printed_command_except_trap; | |
209 | ||
726f6388 | 210 | /* For catching RETURN in a function. */ |
ccc6cda3 | 211 | int return_catch_flag; |
726f6388 | 212 | int return_catch_value; |
ccc6cda3 | 213 | procenv_t return_catch; |
726f6388 JA |
214 | |
215 | /* The value returned by the last synchronous command. */ | |
ccc6cda3 | 216 | int last_command_exit_value; |
726f6388 | 217 | |
b80f6443 JA |
218 | /* Whether or not the last command (corresponding to last_command_exit_value) |
219 | was terminated by a signal, and, if so, which one. */ | |
220 | int last_command_exit_signal; | |
221 | ||
726f6388 JA |
222 | /* The list of redirections to perform which will undo the redirections |
223 | that I made in the shell. */ | |
224 | REDIRECT *redirection_undo_list = (REDIRECT *)NULL; | |
225 | ||
226 | /* The list of redirections to perform which will undo the internal | |
227 | redirections performed by the `exec' builtin. These are redirections | |
228 | that must be undone even when exec discards redirection_undo_list. */ | |
229 | REDIRECT *exec_redirection_undo_list = (REDIRECT *)NULL; | |
230 | ||
3185942a JA |
231 | /* When greater than zero, value is the `level' of builtins we are |
232 | currently executing (e.g. `eval echo a' would have it set to 2). */ | |
233 | int executing_builtin = 0; | |
234 | ||
235 | /* Non-zero if we are executing a command list (a;b;c, etc.) */ | |
236 | int executing_list = 0; | |
237 | ||
238 | /* Non-zero if failing commands in a command substitution should not exit the | |
239 | shell even if -e is set. Used to pass the CMD_IGNORE_RETURN flag down to | |
240 | commands run in command substitutions by parse_and_execute. */ | |
241 | int comsub_ignore_return = 0; | |
242 | ||
726f6388 JA |
243 | /* Non-zero if we have just forked and are currently running in a subshell |
244 | environment. */ | |
ccc6cda3 JA |
245 | int subshell_environment; |
246 | ||
b80f6443 JA |
247 | /* Count of nested subshells, like SHLVL. Available via $BASH_SUBSHELL */ |
248 | int subshell_level = 0; | |
249 | ||
bb70624e JA |
250 | /* Currently-executing shell function. */ |
251 | SHELL_VAR *this_shell_function; | |
252 | ||
95732b49 JA |
253 | /* If non-zero, matches in case and [[ ... ]] are case-insensitive */ |
254 | int match_ignore_case = 0; | |
255 | ||
3185942a JA |
256 | struct stat SB; /* used for debugging */ |
257 | ||
258 | static int special_builtin_failed; | |
259 | ||
260 | static COMMAND *currently_executing_command; | |
261 | ||
262 | /* The line number that the currently executing function starts on. */ | |
263 | static int function_line_number; | |
264 | ||
265 | /* XXX - set to 1 if we're running the DEBUG trap and we want to show the line | |
266 | number containing the function name. Used by executing_line_number to | |
267 | report the correct line number. Kind of a hack. */ | |
268 | static int showing_function_line; | |
269 | ||
270 | static int line_number_for_err_trap; | |
271 | ||
0001803f CR |
272 | /* A sort of function nesting level counter */ |
273 | static int funcnest = 0; | |
274 | int funcnest_max = 0; /* XXX - for bash-4.2 */ | |
275 | ||
726f6388 JA |
276 | struct fd_bitmap *current_fds_to_close = (struct fd_bitmap *)NULL; |
277 | ||
f73dda09 | 278 | #define FD_BITMAP_DEFAULT_SIZE 32 |
d166f048 | 279 | |
726f6388 JA |
280 | /* Functions to allocate and deallocate the structures used to pass |
281 | information from the shell to its children about file descriptors | |
282 | to close. */ | |
283 | struct fd_bitmap * | |
284 | new_fd_bitmap (size) | |
f73dda09 | 285 | int size; |
726f6388 JA |
286 | { |
287 | struct fd_bitmap *ret; | |
288 | ||
289 | ret = (struct fd_bitmap *)xmalloc (sizeof (struct fd_bitmap)); | |
290 | ||
291 | ret->size = size; | |
292 | ||
293 | if (size) | |
294 | { | |
f73dda09 | 295 | ret->bitmap = (char *)xmalloc (size); |
7117c2d2 | 296 | memset (ret->bitmap, '\0', size); |
726f6388 JA |
297 | } |
298 | else | |
299 | ret->bitmap = (char *)NULL; | |
300 | return (ret); | |
301 | } | |
302 | ||
303 | void | |
304 | dispose_fd_bitmap (fdbp) | |
305 | struct fd_bitmap *fdbp; | |
306 | { | |
307 | FREE (fdbp->bitmap); | |
308 | free (fdbp); | |
309 | } | |
310 | ||
311 | void | |
312 | close_fd_bitmap (fdbp) | |
313 | struct fd_bitmap *fdbp; | |
314 | { | |
315 | register int i; | |
316 | ||
317 | if (fdbp) | |
318 | { | |
319 | for (i = 0; i < fdbp->size; i++) | |
320 | if (fdbp->bitmap[i]) | |
321 | { | |
322 | close (i); | |
323 | fdbp->bitmap[i] = 0; | |
324 | } | |
325 | } | |
326 | } | |
327 | ||
ccc6cda3 JA |
328 | /* Return the line number of the currently executing command. */ |
329 | int | |
330 | executing_line_number () | |
331 | { | |
b80f6443 JA |
332 | if (executing && showing_function_line == 0 && |
333 | (variable_context == 0 || interactive_shell == 0) && | |
334 | currently_executing_command) | |
7117c2d2 | 335 | { |
b80f6443 JA |
336 | #if defined (COND_COMMAND) |
337 | if (currently_executing_command->type == cm_cond) | |
7117c2d2 | 338 | return currently_executing_command->value.Cond->line; |
b80f6443 JA |
339 | #endif |
340 | #if defined (DPAREN_ARITHMETIC) | |
7117c2d2 JA |
341 | else if (currently_executing_command->type == cm_arith) |
342 | return currently_executing_command->value.Arith->line; | |
b80f6443 JA |
343 | #endif |
344 | #if defined (ARITH_FOR_COMMAND) | |
7117c2d2 JA |
345 | else if (currently_executing_command->type == cm_arith_for) |
346 | return currently_executing_command->value.ArithFor->line; | |
b80f6443 JA |
347 | #endif |
348 | ||
7117c2d2 JA |
349 | return line_number; |
350 | } | |
d166f048 JA |
351 | else |
352 | return line_number; | |
ccc6cda3 JA |
353 | } |
354 | ||
726f6388 JA |
355 | /* Execute the command passed in COMMAND. COMMAND is exactly what |
356 | read_command () places into GLOBAL_COMMAND. See "command.h" for the | |
357 | details of the command structure. | |
358 | ||
359 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
360 | return values. Executing a command with nothing in it returns | |
361 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 362 | int |
726f6388 JA |
363 | execute_command (command) |
364 | COMMAND *command; | |
365 | { | |
366 | struct fd_bitmap *bitmap; | |
367 | int result; | |
368 | ||
369 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
370 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
371 | begin_unwind_frame ("execute-command"); | |
372 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
373 | ||
374 | /* Just do the command, but not asynchronously. */ | |
375 | result = execute_command_internal (command, 0, NO_PIPE, NO_PIPE, bitmap); | |
376 | ||
377 | dispose_fd_bitmap (bitmap); | |
378 | discard_unwind_frame ("execute-command"); | |
379 | ||
380 | #if defined (PROCESS_SUBSTITUTION) | |
bb70624e JA |
381 | /* don't unlink fifos if we're in a shell function; wait until the function |
382 | returns. */ | |
383 | if (variable_context == 0) | |
384 | unlink_fifo_list (); | |
726f6388 JA |
385 | #endif /* PROCESS_SUBSTITUTION */ |
386 | ||
0628567a | 387 | QUIT; |
726f6388 JA |
388 | return (result); |
389 | } | |
390 | ||
391 | /* Return 1 if TYPE is a shell control structure type. */ | |
392 | static int | |
393 | shell_control_structure (type) | |
394 | enum command_type type; | |
395 | { | |
396 | switch (type) | |
397 | { | |
bb70624e JA |
398 | #if defined (ARITH_FOR_COMMAND) |
399 | case cm_arith_for: | |
400 | #endif | |
726f6388 JA |
401 | #if defined (SELECT_COMMAND) |
402 | case cm_select: | |
cce855bc JA |
403 | #endif |
404 | #if defined (DPAREN_ARITHMETIC) | |
405 | case cm_arith: | |
406 | #endif | |
407 | #if defined (COND_COMMAND) | |
408 | case cm_cond: | |
726f6388 JA |
409 | #endif |
410 | case cm_case: | |
411 | case cm_while: | |
412 | case cm_until: | |
413 | case cm_if: | |
95732b49 | 414 | case cm_for: |
726f6388 | 415 | case cm_group: |
95732b49 | 416 | case cm_function_def: |
726f6388 JA |
417 | return (1); |
418 | ||
419 | default: | |
420 | return (0); | |
421 | } | |
422 | } | |
423 | ||
424 | /* A function to use to unwind_protect the redirection undo list | |
425 | for loops. */ | |
426 | static void | |
427 | cleanup_redirects (list) | |
428 | REDIRECT *list; | |
429 | { | |
b80f6443 | 430 | do_redirections (list, RX_ACTIVE); |
726f6388 JA |
431 | dispose_redirects (list); |
432 | } | |
433 | ||
ccc6cda3 | 434 | #if 0 |
726f6388 JA |
435 | /* Function to unwind_protect the redirections for functions and builtins. */ |
436 | static void | |
437 | cleanup_func_redirects (list) | |
438 | REDIRECT *list; | |
439 | { | |
b80f6443 | 440 | do_redirections (list, RX_ACTIVE); |
726f6388 | 441 | } |
ccc6cda3 | 442 | #endif |
726f6388 | 443 | |
cce855bc | 444 | void |
726f6388 JA |
445 | dispose_exec_redirects () |
446 | { | |
447 | if (exec_redirection_undo_list) | |
448 | { | |
449 | dispose_redirects (exec_redirection_undo_list); | |
450 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
451 | } | |
452 | } | |
453 | ||
454 | #if defined (JOB_CONTROL) | |
455 | /* A function to restore the signal mask to its proper value when the shell | |
456 | is interrupted or errors occur while creating a pipeline. */ | |
457 | static int | |
458 | restore_signal_mask (set) | |
f73dda09 | 459 | sigset_t *set; |
726f6388 | 460 | { |
f73dda09 | 461 | return (sigprocmask (SIG_SETMASK, set, (sigset_t *)NULL)); |
726f6388 JA |
462 | } |
463 | #endif /* JOB_CONTROL */ | |
464 | ||
f73dda09 | 465 | #ifdef DEBUG |
726f6388 JA |
466 | /* A debugging function that can be called from gdb, for instance. */ |
467 | void | |
468 | open_files () | |
469 | { | |
470 | register int i; | |
471 | int f, fd_table_size; | |
472 | ||
473 | fd_table_size = getdtablesize (); | |
474 | ||
f73dda09 | 475 | fprintf (stderr, "pid %ld open files:", (long)getpid ()); |
726f6388 JA |
476 | for (i = 3; i < fd_table_size; i++) |
477 | { | |
478 | if ((f = fcntl (i, F_GETFD, 0)) != -1) | |
479 | fprintf (stderr, " %d (%s)", i, f ? "close" : "open"); | |
480 | } | |
481 | fprintf (stderr, "\n"); | |
482 | } | |
f73dda09 | 483 | #endif |
726f6388 | 484 | |
d166f048 JA |
485 | static void |
486 | async_redirect_stdin () | |
487 | { | |
488 | int fd; | |
489 | ||
490 | fd = open ("/dev/null", O_RDONLY); | |
491 | if (fd > 0) | |
492 | { | |
493 | dup2 (fd, 0); | |
494 | close (fd); | |
495 | } | |
496 | else if (fd < 0) | |
b80f6443 | 497 | internal_error (_("cannot redirect standard input from /dev/null: %s"), strerror (errno)); |
d166f048 JA |
498 | } |
499 | ||
ccc6cda3 | 500 | #define DESCRIBE_PID(pid) do { if (interactive) describe_pid (pid); } while (0) |
726f6388 JA |
501 | |
502 | /* Execute the command passed in COMMAND, perhaps doing it asynchrounously. | |
503 | COMMAND is exactly what read_command () places into GLOBAL_COMMAND. | |
504 | ASYNCHROUNOUS, if non-zero, says to do this command in the background. | |
505 | PIPE_IN and PIPE_OUT are file descriptors saying where input comes | |
506 | from and where it goes. They can have the value of NO_PIPE, which means | |
507 | I/O is stdin/stdout. | |
508 | FDS_TO_CLOSE is a list of file descriptors to close once the child has | |
509 | been forked. This list often contains the unusable sides of pipes, etc. | |
510 | ||
511 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
512 | return values. Executing a command with nothing in it returns | |
513 | EXECUTION_SUCCESS. */ | |
ccc6cda3 JA |
514 | int |
515 | execute_command_internal (command, asynchronous, pipe_in, pipe_out, | |
726f6388 JA |
516 | fds_to_close) |
517 | COMMAND *command; | |
518 | int asynchronous; | |
519 | int pipe_in, pipe_out; | |
520 | struct fd_bitmap *fds_to_close; | |
521 | { | |
17345e5a | 522 | int exec_result, user_subshell, invert, ignore_return, was_error_trap; |
d166f048 | 523 | REDIRECT *my_undo_list, *exec_undo_list; |
95732b49 | 524 | volatile int last_pid; |
b80f6443 | 525 | volatile int save_line_number; |
726f6388 | 526 | |
f1be666c | 527 | #if 0 |
ccc6cda3 | 528 | if (command == 0 || breaking || continuing || read_but_dont_execute) |
726f6388 | 529 | return (EXECUTION_SUCCESS); |
f1be666c JA |
530 | #else |
531 | if (breaking || continuing) | |
532 | return (last_command_exit_value); | |
533 | if (command == 0 || read_but_dont_execute) | |
534 | return (EXECUTION_SUCCESS); | |
535 | #endif | |
726f6388 | 536 | |
0628567a | 537 | QUIT; |
726f6388 JA |
538 | run_pending_traps (); |
539 | ||
b80f6443 | 540 | #if 0 |
ccc6cda3 | 541 | if (running_trap == 0) |
b80f6443 | 542 | #endif |
ccc6cda3 JA |
543 | currently_executing_command = command; |
544 | ||
726f6388 | 545 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
d166f048 JA |
546 | |
547 | /* If we're inverting the return value and `set -e' has been executed, | |
548 | we don't want a failing command to inadvertently cause the shell | |
549 | to exit. */ | |
550 | if (exit_immediately_on_error && invert) /* XXX */ | |
551 | command->flags |= CMD_IGNORE_RETURN; /* XXX */ | |
552 | ||
ccc6cda3 | 553 | exec_result = EXECUTION_SUCCESS; |
726f6388 JA |
554 | |
555 | /* If a command was being explicitly run in a subshell, or if it is | |
556 | a shell control-structure, and it has a pipe, then we do the command | |
557 | in a subshell. */ | |
bb70624e JA |
558 | if (command->type == cm_subshell && (command->flags & CMD_NO_FORK)) |
559 | return (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); | |
726f6388 | 560 | |
3185942a JA |
561 | #if defined (COPROCESS_SUPPORT) |
562 | if (command->type == cm_coproc) | |
563 | return (execute_coproc (command, pipe_in, pipe_out, fds_to_close)); | |
564 | #endif | |
565 | ||
17345e5a JA |
566 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); |
567 | ||
bb70624e JA |
568 | if (command->type == cm_subshell || |
569 | (command->flags & (CMD_WANT_SUBSHELL|CMD_FORCE_SUBSHELL)) || | |
726f6388 JA |
570 | (shell_control_structure (command->type) && |
571 | (pipe_out != NO_PIPE || pipe_in != NO_PIPE || asynchronous))) | |
572 | { | |
573 | pid_t paren_pid; | |
574 | ||
575 | /* Fork a subshell, turn off the subshell bit, turn off job | |
576 | control and call execute_command () on the command again. */ | |
89a92869 | 577 | line_number_for_err_trap = line_number; |
726f6388 JA |
578 | paren_pid = make_child (savestring (make_command_string (command)), |
579 | asynchronous); | |
580 | if (paren_pid == 0) | |
28ef6c31 JA |
581 | exit (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); |
582 | /* NOTREACHED */ | |
726f6388 JA |
583 | else |
584 | { | |
585 | close_pipes (pipe_in, pipe_out); | |
586 | ||
587 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
588 | unlink_fifo_list (); | |
589 | #endif | |
590 | /* If we are part of a pipeline, and not the end of the pipeline, | |
591 | then we should simply return and let the last command in the | |
592 | pipe be waited for. If we are not in a pipeline, or are the | |
ccc6cda3 | 593 | last command in the pipeline, then we wait for the subshell |
726f6388 JA |
594 | and return its exit status as usual. */ |
595 | if (pipe_out != NO_PIPE) | |
596 | return (EXECUTION_SUCCESS); | |
597 | ||
598 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
599 | ||
ccc6cda3 | 600 | if (asynchronous == 0) |
726f6388 | 601 | { |
17345e5a JA |
602 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
603 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
604 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
605 | ||
726f6388 JA |
606 | last_command_exit_value = wait_for (paren_pid); |
607 | ||
608 | /* If we have to, invert the return value. */ | |
609 | if (invert) | |
bb70624e JA |
610 | exec_result = ((last_command_exit_value == EXECUTION_SUCCESS) |
611 | ? EXECUTION_FAILURE | |
612 | : EXECUTION_SUCCESS); | |
726f6388 | 613 | else |
bb70624e JA |
614 | exec_result = last_command_exit_value; |
615 | ||
17345e5a JA |
616 | if (user_subshell && was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) |
617 | { | |
618 | last_command_exit_value = exec_result; | |
89a92869 CR |
619 | save_line_number = line_number; |
620 | line_number = line_number_for_err_trap; | |
17345e5a | 621 | run_error_trap (); |
89a92869 | 622 | line_number = save_line_number; |
17345e5a JA |
623 | } |
624 | ||
625 | if (user_subshell && ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
626 | { | |
627 | last_command_exit_value = exec_result; | |
628 | run_pending_traps (); | |
629 | jump_to_top_level (ERREXIT); | |
630 | } | |
631 | ||
bb70624e | 632 | return (last_command_exit_value = exec_result); |
726f6388 JA |
633 | } |
634 | else | |
635 | { | |
636 | DESCRIBE_PID (paren_pid); | |
637 | ||
638 | run_pending_traps (); | |
639 | ||
640 | return (EXECUTION_SUCCESS); | |
641 | } | |
642 | } | |
643 | } | |
644 | ||
d166f048 JA |
645 | #if defined (COMMAND_TIMING) |
646 | if (command->flags & CMD_TIME_PIPELINE) | |
647 | { | |
648 | if (asynchronous) | |
649 | { | |
650 | command->flags |= CMD_FORCE_SUBSHELL; | |
651 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
652 | } | |
653 | else | |
654 | { | |
655 | exec_result = time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
b80f6443 | 656 | #if 0 |
d166f048 | 657 | if (running_trap == 0) |
b80f6443 | 658 | #endif |
d166f048 JA |
659 | currently_executing_command = (COMMAND *)NULL; |
660 | } | |
661 | return (exec_result); | |
662 | } | |
663 | #endif /* COMMAND_TIMING */ | |
664 | ||
665 | if (shell_control_structure (command->type) && command->redirects) | |
666 | stdin_redir = stdin_redirects (command->redirects); | |
667 | ||
726f6388 JA |
668 | /* Handle WHILE FOR CASE etc. with redirections. (Also '&' input |
669 | redirection.) */ | |
b80f6443 | 670 | if (do_redirections (command->redirects, RX_ACTIVE|RX_UNDOABLE) != 0) |
726f6388 JA |
671 | { |
672 | cleanup_redirects (redirection_undo_list); | |
673 | redirection_undo_list = (REDIRECT *)NULL; | |
674 | dispose_exec_redirects (); | |
f1be666c | 675 | return (last_command_exit_value = EXECUTION_FAILURE); |
726f6388 JA |
676 | } |
677 | ||
678 | if (redirection_undo_list) | |
679 | { | |
680 | my_undo_list = (REDIRECT *)copy_redirects (redirection_undo_list); | |
681 | dispose_redirects (redirection_undo_list); | |
682 | redirection_undo_list = (REDIRECT *)NULL; | |
683 | } | |
684 | else | |
685 | my_undo_list = (REDIRECT *)NULL; | |
686 | ||
687 | if (exec_redirection_undo_list) | |
688 | { | |
689 | exec_undo_list = (REDIRECT *)copy_redirects (exec_redirection_undo_list); | |
690 | dispose_redirects (exec_redirection_undo_list); | |
691 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
692 | } | |
693 | else | |
694 | exec_undo_list = (REDIRECT *)NULL; | |
695 | ||
696 | if (my_undo_list || exec_undo_list) | |
697 | begin_unwind_frame ("loop_redirections"); | |
698 | ||
699 | if (my_undo_list) | |
700 | add_unwind_protect ((Function *)cleanup_redirects, my_undo_list); | |
701 | ||
702 | if (exec_undo_list) | |
703 | add_unwind_protect ((Function *)dispose_redirects, exec_undo_list); | |
704 | ||
705 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
706 | ||
707 | QUIT; | |
708 | ||
709 | switch (command->type) | |
710 | { | |
ccc6cda3 JA |
711 | case cm_simple: |
712 | { | |
b80f6443 JA |
713 | save_line_number = line_number; |
714 | /* We can't rely on variables retaining their values across a | |
ccc6cda3 JA |
715 | call to execute_simple_command if a longjmp occurs as the |
716 | result of a `return' builtin. This is true for sure with gcc. */ | |
95732b49 JA |
717 | #if defined (RECYCLES_PIDS) |
718 | last_made_pid = NO_PID; | |
719 | #endif | |
ccc6cda3 | 720 | last_pid = last_made_pid; |
f73dda09 | 721 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
ccc6cda3 JA |
722 | |
723 | if (ignore_return && command->value.Simple) | |
724 | command->value.Simple->flags |= CMD_IGNORE_RETURN; | |
d166f048 JA |
725 | if (command->flags & CMD_STDIN_REDIR) |
726 | command->value.Simple->flags |= CMD_STDIN_REDIR; | |
b80f6443 | 727 | |
0628567a | 728 | line_number_for_err_trap = line_number = command->value.Simple->line; |
ccc6cda3 JA |
729 | exec_result = |
730 | execute_simple_command (command->value.Simple, pipe_in, pipe_out, | |
731 | asynchronous, fds_to_close); | |
b80f6443 | 732 | line_number = save_line_number; |
ccc6cda3 JA |
733 | |
734 | /* The temporary environment should be used for only the simple | |
735 | command immediately following its definition. */ | |
736 | dispose_used_env_vars (); | |
737 | ||
738 | #if (defined (ultrix) && defined (mips)) || defined (C_ALLOCA) | |
739 | /* Reclaim memory allocated with alloca () on machines which | |
740 | may be using the alloca emulation code. */ | |
741 | (void) alloca (0); | |
742 | #endif /* (ultrix && mips) || C_ALLOCA */ | |
743 | ||
744 | /* If we forked to do the command, then we must wait_for () | |
745 | the child. */ | |
746 | ||
747 | /* XXX - this is something to watch out for if there are problems | |
748 | when the shell is compiled without job control. */ | |
749 | if (already_making_children && pipe_out == NO_PIPE && | |
95732b49 | 750 | last_made_pid != last_pid) |
ccc6cda3 JA |
751 | { |
752 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
753 | ||
754 | if (asynchronous) | |
755 | { | |
756 | DESCRIBE_PID (last_made_pid); | |
757 | } | |
758 | else | |
759 | #if !defined (JOB_CONTROL) | |
760 | /* Do not wait for asynchronous processes started from | |
761 | startup files. */ | |
762 | if (last_made_pid != last_asynchronous_pid) | |
763 | #endif | |
764 | /* When executing a shell function that executes other | |
765 | commands, this causes the last simple command in | |
b80f6443 JA |
766 | the function to be waited for twice. This also causes |
767 | subshells forked to execute builtin commands (e.g., in | |
768 | pipelines) to be waited for twice. */ | |
ccc6cda3 JA |
769 | exec_result = wait_for (last_made_pid); |
770 | } | |
771 | } | |
772 | ||
17345e5a JA |
773 | /* 2009/02/13 -- pipeline failure is processed elsewhere. This handles |
774 | only the failure of a simple command. */ | |
3185942a | 775 | if (was_error_trap && ignore_return == 0 && invert == 0 && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS) |
f73dda09 JA |
776 | { |
777 | last_command_exit_value = exec_result; | |
89a92869 | 778 | line_number = line_number_for_err_trap; |
f73dda09 | 779 | run_error_trap (); |
89a92869 | 780 | line_number = save_line_number; |
f73dda09 JA |
781 | } |
782 | ||
ccc6cda3 | 783 | if (ignore_return == 0 && invert == 0 && |
cce855bc | 784 | ((posixly_correct && interactive == 0 && special_builtin_failed) || |
3185942a | 785 | (exit_immediately_on_error && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS))) |
ccc6cda3 JA |
786 | { |
787 | last_command_exit_value = exec_result; | |
788 | run_pending_traps (); | |
b80f6443 | 789 | jump_to_top_level (ERREXIT); |
ccc6cda3 JA |
790 | } |
791 | ||
792 | break; | |
793 | ||
726f6388 JA |
794 | case cm_for: |
795 | if (ignore_return) | |
796 | command->value.For->flags |= CMD_IGNORE_RETURN; | |
797 | exec_result = execute_for_command (command->value.For); | |
798 | break; | |
799 | ||
bb70624e JA |
800 | #if defined (ARITH_FOR_COMMAND) |
801 | case cm_arith_for: | |
802 | if (ignore_return) | |
803 | command->value.ArithFor->flags |= CMD_IGNORE_RETURN; | |
804 | exec_result = execute_arith_for_command (command->value.ArithFor); | |
805 | break; | |
806 | #endif | |
807 | ||
726f6388 JA |
808 | #if defined (SELECT_COMMAND) |
809 | case cm_select: | |
810 | if (ignore_return) | |
811 | command->value.Select->flags |= CMD_IGNORE_RETURN; | |
812 | exec_result = execute_select_command (command->value.Select); | |
813 | break; | |
814 | #endif | |
815 | ||
816 | case cm_case: | |
817 | if (ignore_return) | |
818 | command->value.Case->flags |= CMD_IGNORE_RETURN; | |
819 | exec_result = execute_case_command (command->value.Case); | |
820 | break; | |
821 | ||
822 | case cm_while: | |
823 | if (ignore_return) | |
824 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
825 | exec_result = execute_while_command (command->value.While); | |
826 | break; | |
827 | ||
828 | case cm_until: | |
829 | if (ignore_return) | |
830 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
831 | exec_result = execute_until_command (command->value.While); | |
832 | break; | |
833 | ||
834 | case cm_if: | |
835 | if (ignore_return) | |
836 | command->value.If->flags |= CMD_IGNORE_RETURN; | |
837 | exec_result = execute_if_command (command->value.If); | |
838 | break; | |
839 | ||
840 | case cm_group: | |
841 | ||
842 | /* This code can be executed from either of two paths: an explicit | |
843 | '{}' command, or via a function call. If we are executed via a | |
844 | function call, we have already taken care of the function being | |
845 | executed in the background (down there in execute_simple_command ()), | |
846 | and this command should *not* be marked as asynchronous. If we | |
847 | are executing a regular '{}' group command, and asynchronous == 1, | |
848 | we must want to execute the whole command in the background, so we | |
849 | need a subshell, and we want the stuff executed in that subshell | |
850 | (this group command) to be executed in the foreground of that | |
851 | subshell (i.e. there will not be *another* subshell forked). | |
852 | ||
853 | What we do is to force a subshell if asynchronous, and then call | |
854 | execute_command_internal again with asynchronous still set to 1, | |
855 | but with the original group command, so the printed command will | |
856 | look right. | |
857 | ||
858 | The code above that handles forking off subshells will note that | |
859 | both subshell and async are on, and turn off async in the child | |
860 | after forking the subshell (but leave async set in the parent, so | |
861 | the normal call to describe_pid is made). This turning off | |
862 | async is *crucial*; if it is not done, this will fall into an | |
863 | infinite loop of executions through this spot in subshell after | |
864 | subshell until the process limit is exhausted. */ | |
865 | ||
866 | if (asynchronous) | |
867 | { | |
868 | command->flags |= CMD_FORCE_SUBSHELL; | |
869 | exec_result = | |
870 | execute_command_internal (command, 1, pipe_in, pipe_out, | |
871 | fds_to_close); | |
872 | } | |
873 | else | |
874 | { | |
875 | if (ignore_return && command->value.Group->command) | |
876 | command->value.Group->command->flags |= CMD_IGNORE_RETURN; | |
877 | exec_result = | |
878 | execute_command_internal (command->value.Group->command, | |
879 | asynchronous, pipe_in, pipe_out, | |
880 | fds_to_close); | |
881 | } | |
882 | break; | |
883 | ||
ccc6cda3 JA |
884 | case cm_connection: |
885 | exec_result = execute_connection (command, asynchronous, | |
886 | pipe_in, pipe_out, fds_to_close); | |
887 | break; | |
726f6388 | 888 | |
cce855bc JA |
889 | #if defined (DPAREN_ARITHMETIC) |
890 | case cm_arith: | |
0001803f | 891 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
cce855bc JA |
892 | if (ignore_return) |
893 | command->value.Arith->flags |= CMD_IGNORE_RETURN; | |
0001803f | 894 | line_number_for_err_trap = save_line_number = line_number; |
cce855bc | 895 | exec_result = execute_arith_command (command->value.Arith); |
0001803f CR |
896 | line_number = save_line_number; |
897 | ||
898 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
899 | { | |
900 | last_command_exit_value = exec_result; | |
901 | save_line_number = line_number; | |
902 | line_number = line_number_for_err_trap; | |
903 | run_error_trap (); | |
904 | line_number = save_line_number; | |
905 | } | |
906 | ||
907 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
908 | { | |
909 | last_command_exit_value = exec_result; | |
910 | run_pending_traps (); | |
911 | jump_to_top_level (ERREXIT); | |
912 | } | |
913 | ||
cce855bc JA |
914 | break; |
915 | #endif | |
916 | ||
917 | #if defined (COND_COMMAND) | |
918 | case cm_cond: | |
0001803f | 919 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
cce855bc JA |
920 | if (ignore_return) |
921 | command->value.Cond->flags |= CMD_IGNORE_RETURN; | |
0001803f CR |
922 | |
923 | line_number_for_err_trap = save_line_number = line_number; | |
cce855bc | 924 | exec_result = execute_cond_command (command->value.Cond); |
b80f6443 | 925 | line_number = save_line_number; |
0001803f CR |
926 | |
927 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
928 | { | |
929 | last_command_exit_value = exec_result; | |
930 | save_line_number = line_number; | |
931 | line_number = line_number_for_err_trap; | |
932 | run_error_trap (); | |
933 | line_number = save_line_number; | |
934 | } | |
935 | ||
936 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
937 | { | |
938 | last_command_exit_value = exec_result; | |
939 | run_pending_traps (); | |
940 | jump_to_top_level (ERREXIT); | |
941 | } | |
942 | ||
cce855bc JA |
943 | break; |
944 | #endif | |
945 | ||
ccc6cda3 JA |
946 | case cm_function_def: |
947 | exec_result = execute_intern_function (command->value.Function_def->name, | |
948 | command->value.Function_def->command); | |
949 | break; | |
726f6388 | 950 | |
ccc6cda3 | 951 | default: |
b72432fd | 952 | command_error ("execute_command", CMDERR_BADTYPE, command->type, 0); |
ccc6cda3 | 953 | } |
726f6388 | 954 | |
ccc6cda3 JA |
955 | if (my_undo_list) |
956 | { | |
b80f6443 | 957 | do_redirections (my_undo_list, RX_ACTIVE); |
ccc6cda3 JA |
958 | dispose_redirects (my_undo_list); |
959 | } | |
726f6388 | 960 | |
ccc6cda3 JA |
961 | if (exec_undo_list) |
962 | dispose_redirects (exec_undo_list); | |
726f6388 | 963 | |
ccc6cda3 JA |
964 | if (my_undo_list || exec_undo_list) |
965 | discard_unwind_frame ("loop_redirections"); | |
726f6388 | 966 | |
ccc6cda3 JA |
967 | /* Invert the return value if we have to */ |
968 | if (invert) | |
969 | exec_result = (exec_result == EXECUTION_SUCCESS) | |
970 | ? EXECUTION_FAILURE | |
971 | : EXECUTION_SUCCESS; | |
726f6388 | 972 | |
0628567a JA |
973 | #if defined (DPAREN_ARITHMETIC) || defined (COND_COMMAND) |
974 | /* This is where we set PIPESTATUS from the exit status of the appropriate | |
975 | compound commands (the ones that look enough like simple commands to | |
976 | cause confusion). We might be able to optimize by not doing this if | |
977 | subshell_environment != 0. */ | |
978 | switch (command->type) | |
979 | { | |
980 | # if defined (DPAREN_ARITHMETIC) | |
981 | case cm_arith: | |
982 | # endif | |
983 | # if defined (COND_COMMAND) | |
984 | case cm_cond: | |
985 | # endif | |
986 | set_pipestatus_from_exit (exec_result); | |
987 | break; | |
988 | } | |
989 | #endif | |
990 | ||
ccc6cda3 JA |
991 | last_command_exit_value = exec_result; |
992 | run_pending_traps (); | |
b80f6443 | 993 | #if 0 |
ccc6cda3 | 994 | if (running_trap == 0) |
b80f6443 | 995 | #endif |
ccc6cda3 JA |
996 | currently_executing_command = (COMMAND *)NULL; |
997 | return (last_command_exit_value); | |
998 | } | |
726f6388 | 999 | |
ccc6cda3 | 1000 | #if defined (COMMAND_TIMING) |
726f6388 | 1001 | |
bb70624e | 1002 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
f73dda09 JA |
1003 | extern struct timeval *difftimeval __P((struct timeval *, struct timeval *, struct timeval *)); |
1004 | extern struct timeval *addtimeval __P((struct timeval *, struct timeval *, struct timeval *)); | |
1005 | extern int timeval_to_cpu __P((struct timeval *, struct timeval *, struct timeval *)); | |
bb70624e | 1006 | #endif |
726f6388 | 1007 | |
ccc6cda3 JA |
1008 | #define POSIX_TIMEFORMAT "real %2R\nuser %2U\nsys %2S" |
1009 | #define BASH_TIMEFORMAT "\nreal\t%3lR\nuser\t%3lU\nsys\t%3lS" | |
726f6388 | 1010 | |
3185942a | 1011 | static const int precs[] = { 0, 100, 10, 1 }; |
726f6388 | 1012 | |
ccc6cda3 JA |
1013 | /* Expand one `%'-prefixed escape sequence from a time format string. */ |
1014 | static int | |
1015 | mkfmt (buf, prec, lng, sec, sec_fraction) | |
1016 | char *buf; | |
1017 | int prec, lng; | |
f73dda09 | 1018 | time_t sec; |
ccc6cda3 JA |
1019 | int sec_fraction; |
1020 | { | |
f73dda09 JA |
1021 | time_t min; |
1022 | char abuf[INT_STRLEN_BOUND(time_t) + 1]; | |
ccc6cda3 | 1023 | int ind, aind; |
726f6388 | 1024 | |
ccc6cda3 | 1025 | ind = 0; |
f73dda09 | 1026 | abuf[sizeof(abuf) - 1] = '\0'; |
726f6388 | 1027 | |
ccc6cda3 JA |
1028 | /* If LNG is non-zero, we want to decompose SEC into minutes and seconds. */ |
1029 | if (lng) | |
1030 | { | |
1031 | min = sec / 60; | |
1032 | sec %= 60; | |
f73dda09 | 1033 | aind = sizeof(abuf) - 2; |
ccc6cda3 JA |
1034 | do |
1035 | abuf[aind--] = (min % 10) + '0'; | |
1036 | while (min /= 10); | |
1037 | aind++; | |
1038 | while (abuf[aind]) | |
cce855bc | 1039 | buf[ind++] = abuf[aind++]; |
ccc6cda3 JA |
1040 | buf[ind++] = 'm'; |
1041 | } | |
726f6388 | 1042 | |
ccc6cda3 | 1043 | /* Now add the seconds. */ |
f73dda09 | 1044 | aind = sizeof (abuf) - 2; |
ccc6cda3 JA |
1045 | do |
1046 | abuf[aind--] = (sec % 10) + '0'; | |
1047 | while (sec /= 10); | |
1048 | aind++; | |
1049 | while (abuf[aind]) | |
1050 | buf[ind++] = abuf[aind++]; | |
1051 | ||
1052 | /* We want to add a decimal point and PREC places after it if PREC is | |
1053 | nonzero. PREC is not greater than 3. SEC_FRACTION is between 0 | |
1054 | and 999. */ | |
1055 | if (prec != 0) | |
1056 | { | |
1057 | buf[ind++] = '.'; | |
1058 | for (aind = 1; aind <= prec; aind++) | |
1059 | { | |
1060 | buf[ind++] = (sec_fraction / precs[aind]) + '0'; | |
1061 | sec_fraction %= precs[aind]; | |
1062 | } | |
1063 | } | |
726f6388 | 1064 | |
ccc6cda3 JA |
1065 | if (lng) |
1066 | buf[ind++] = 's'; | |
1067 | buf[ind] = '\0'; | |
726f6388 | 1068 | |
ccc6cda3 JA |
1069 | return (ind); |
1070 | } | |
726f6388 | 1071 | |
ccc6cda3 JA |
1072 | /* Interpret the format string FORMAT, interpolating the following escape |
1073 | sequences: | |
7117c2d2 | 1074 | %[prec][l][RUS] |
ccc6cda3 JA |
1075 | |
1076 | where the optional `prec' is a precision, meaning the number of | |
1077 | characters after the decimal point, the optional `l' means to format | |
1078 | using minutes and seconds (MMmNN[.FF]s), like the `times' builtin', | |
1079 | and the last character is one of | |
1080 | ||
7117c2d2 JA |
1081 | R number of seconds of `real' time |
1082 | U number of seconds of `user' time | |
1083 | S number of seconds of `system' time | |
ccc6cda3 JA |
1084 | |
1085 | An occurrence of `%%' in the format string is translated to a `%'. The | |
1086 | result is printed to FP, a pointer to a FILE. The other variables are | |
1087 | the seconds and thousandths of a second of real, user, and system time, | |
1088 | resectively. */ | |
1089 | static void | |
1090 | print_formatted_time (fp, format, rs, rsf, us, usf, ss, ssf, cpu) | |
1091 | FILE *fp; | |
1092 | char *format; | |
f73dda09 JA |
1093 | time_t rs; |
1094 | int rsf; | |
1095 | time_t us; | |
1096 | int usf; | |
1097 | time_t ss; | |
1098 | int ssf, cpu; | |
ccc6cda3 JA |
1099 | { |
1100 | int prec, lng, len; | |
f73dda09 JA |
1101 | char *str, *s, ts[INT_STRLEN_BOUND (time_t) + sizeof ("mSS.FFFF")]; |
1102 | time_t sum; | |
e8ce775d | 1103 | int sum_frac; |
ccc6cda3 | 1104 | int sindex, ssize; |
726f6388 | 1105 | |
ccc6cda3 JA |
1106 | len = strlen (format); |
1107 | ssize = (len + 64) - (len % 64); | |
f73dda09 | 1108 | str = (char *)xmalloc (ssize); |
ccc6cda3 JA |
1109 | sindex = 0; |
1110 | ||
1111 | for (s = format; *s; s++) | |
1112 | { | |
1113 | if (*s != '%' || s[1] == '\0') | |
cce855bc JA |
1114 | { |
1115 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1116 | str[sindex++] = *s; | |
1117 | } | |
ccc6cda3 | 1118 | else if (s[1] == '%') |
cce855bc JA |
1119 | { |
1120 | s++; | |
1121 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1122 | str[sindex++] = *s; | |
1123 | } | |
ccc6cda3 JA |
1124 | else if (s[1] == 'P') |
1125 | { | |
1126 | s++; | |
17345e5a JA |
1127 | #if 0 |
1128 | /* clamp CPU usage at 100% */ | |
ccc6cda3 JA |
1129 | if (cpu > 10000) |
1130 | cpu = 10000; | |
17345e5a | 1131 | #endif |
ccc6cda3 JA |
1132 | sum = cpu / 100; |
1133 | sum_frac = (cpu % 100) * 10; | |
1134 | len = mkfmt (ts, 2, 0, sum, sum_frac); | |
1135 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1136 | strcpy (str + sindex, ts); | |
1137 | sindex += len; | |
1138 | } | |
1139 | else | |
1140 | { | |
1141 | prec = 3; /* default is three places past the decimal point. */ | |
1142 | lng = 0; /* default is to not use minutes or append `s' */ | |
1143 | s++; | |
f73dda09 | 1144 | if (DIGIT (*s)) /* `precision' */ |
726f6388 | 1145 | { |
ccc6cda3 JA |
1146 | prec = *s++ - '0'; |
1147 | if (prec > 3) prec = 3; | |
726f6388 | 1148 | } |
ccc6cda3 JA |
1149 | if (*s == 'l') /* `length extender' */ |
1150 | { | |
1151 | lng = 1; | |
1152 | s++; | |
1153 | } | |
1154 | if (*s == 'R' || *s == 'E') | |
1155 | len = mkfmt (ts, prec, lng, rs, rsf); | |
1156 | else if (*s == 'U') | |
1157 | len = mkfmt (ts, prec, lng, us, usf); | |
1158 | else if (*s == 'S') | |
1159 | len = mkfmt (ts, prec, lng, ss, ssf); | |
1160 | else | |
1161 | { | |
b80f6443 | 1162 | internal_error (_("TIMEFORMAT: `%c': invalid format character"), *s); |
ccc6cda3 JA |
1163 | free (str); |
1164 | return; | |
1165 | } | |
1166 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1167 | strcpy (str + sindex, ts); | |
1168 | sindex += len; | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | str[sindex] = '\0'; | |
1173 | fprintf (fp, "%s\n", str); | |
1174 | fflush (fp); | |
1175 | ||
1176 | free (str); | |
1177 | } | |
1178 | ||
1179 | static int | |
1180 | time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1181 | COMMAND *command; | |
1182 | int asynchronous, pipe_in, pipe_out; | |
1183 | struct fd_bitmap *fds_to_close; | |
1184 | { | |
d166f048 | 1185 | int rv, posix_time, old_flags; |
f73dda09 | 1186 | time_t rs, us, ss; |
ccc6cda3 JA |
1187 | int rsf, usf, ssf; |
1188 | int cpu; | |
1189 | char *time_format; | |
1190 | ||
1191 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1192 | struct timeval real, user, sys; | |
1193 | struct timeval before, after; | |
b80f6443 JA |
1194 | # if defined (HAVE_STRUCT_TIMEZONE) |
1195 | struct timezone dtz; /* posix doesn't define this */ | |
1196 | # endif | |
ccc6cda3 JA |
1197 | struct rusage selfb, selfa, kidsb, kidsa; /* a = after, b = before */ |
1198 | #else | |
1199 | # if defined (HAVE_TIMES) | |
1200 | clock_t tbefore, tafter, real, user, sys; | |
1201 | struct tms before, after; | |
1202 | # endif | |
1203 | #endif | |
1204 | ||
1205 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
b80f6443 | 1206 | # if defined (HAVE_STRUCT_TIMEZONE) |
ccc6cda3 | 1207 | gettimeofday (&before, &dtz); |
b80f6443 JA |
1208 | # else |
1209 | gettimeofday (&before, (void *)NULL); | |
1210 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
ccc6cda3 JA |
1211 | getrusage (RUSAGE_SELF, &selfb); |
1212 | getrusage (RUSAGE_CHILDREN, &kidsb); | |
1213 | #else | |
1214 | # if defined (HAVE_TIMES) | |
1215 | tbefore = times (&before); | |
1216 | # endif | |
1217 | #endif | |
1218 | ||
1219 | posix_time = (command->flags & CMD_TIME_POSIX); | |
1220 | ||
d166f048 | 1221 | old_flags = command->flags; |
ccc6cda3 JA |
1222 | command->flags &= ~(CMD_TIME_PIPELINE|CMD_TIME_POSIX); |
1223 | rv = execute_command_internal (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
d166f048 | 1224 | command->flags = old_flags; |
ccc6cda3 | 1225 | |
f73dda09 | 1226 | rs = us = ss = 0; |
cce855bc JA |
1227 | rsf = usf = ssf = cpu = 0; |
1228 | ||
ccc6cda3 | 1229 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) |
b80f6443 | 1230 | # if defined (HAVE_STRUCT_TIMEZONE) |
ccc6cda3 | 1231 | gettimeofday (&after, &dtz); |
b80f6443 JA |
1232 | # else |
1233 | gettimeofday (&after, (void *)NULL); | |
1234 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
ccc6cda3 JA |
1235 | getrusage (RUSAGE_SELF, &selfa); |
1236 | getrusage (RUSAGE_CHILDREN, &kidsa); | |
1237 | ||
1238 | difftimeval (&real, &before, &after); | |
1239 | timeval_to_secs (&real, &rs, &rsf); | |
1240 | ||
1241 | addtimeval (&user, difftimeval(&after, &selfb.ru_utime, &selfa.ru_utime), | |
1242 | difftimeval(&before, &kidsb.ru_utime, &kidsa.ru_utime)); | |
1243 | timeval_to_secs (&user, &us, &usf); | |
1244 | ||
1245 | addtimeval (&sys, difftimeval(&after, &selfb.ru_stime, &selfa.ru_stime), | |
1246 | difftimeval(&before, &kidsb.ru_stime, &kidsa.ru_stime)); | |
1247 | timeval_to_secs (&sys, &ss, &ssf); | |
1248 | ||
1249 | cpu = timeval_to_cpu (&real, &user, &sys); | |
1250 | #else | |
1251 | # if defined (HAVE_TIMES) | |
1252 | tafter = times (&after); | |
1253 | ||
1254 | real = tafter - tbefore; | |
1255 | clock_t_to_secs (real, &rs, &rsf); | |
1256 | ||
1257 | user = (after.tms_utime - before.tms_utime) + (after.tms_cutime - before.tms_cutime); | |
1258 | clock_t_to_secs (user, &us, &usf); | |
1259 | ||
1260 | sys = (after.tms_stime - before.tms_stime) + (after.tms_cstime - before.tms_cstime); | |
1261 | clock_t_to_secs (sys, &ss, &ssf); | |
1262 | ||
d166f048 | 1263 | cpu = (real == 0) ? 0 : ((user + sys) * 10000) / real; |
ccc6cda3 JA |
1264 | |
1265 | # else | |
f73dda09 | 1266 | rs = us = ss = 0; |
ccc6cda3 JA |
1267 | rsf = usf = ssf = cpu = 0; |
1268 | # endif | |
1269 | #endif | |
1270 | ||
1271 | if (posix_time) | |
1272 | time_format = POSIX_TIMEFORMAT; | |
1273 | else if ((time_format = get_string_value ("TIMEFORMAT")) == 0) | |
1274 | time_format = BASH_TIMEFORMAT; | |
1275 | ||
1276 | if (time_format && *time_format) | |
1277 | print_formatted_time (stderr, time_format, rs, rsf, us, usf, ss, ssf, cpu); | |
1278 | ||
1279 | return rv; | |
1280 | } | |
1281 | #endif /* COMMAND_TIMING */ | |
1282 | ||
bb70624e | 1283 | /* Execute a command that's supposed to be in a subshell. This must be |
28ef6c31 JA |
1284 | called after make_child and we must be running in the child process. |
1285 | The caller will return or exit() immediately with the value this returns. */ | |
bb70624e JA |
1286 | static int |
1287 | execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1288 | COMMAND *command; | |
1289 | int asynchronous; | |
1290 | int pipe_in, pipe_out; | |
1291 | struct fd_bitmap *fds_to_close; | |
1292 | { | |
28ef6c31 | 1293 | int user_subshell, return_code, function_value, should_redir_stdin, invert; |
3185942a | 1294 | int ois, user_coproc; |
0001803f | 1295 | int result; |
bb70624e JA |
1296 | COMMAND *tcom; |
1297 | ||
f73dda09 | 1298 | USE_VAR(user_subshell); |
3185942a | 1299 | USE_VAR(user_coproc); |
f73dda09 JA |
1300 | USE_VAR(invert); |
1301 | USE_VAR(tcom); | |
1302 | USE_VAR(asynchronous); | |
1303 | ||
b80f6443 | 1304 | subshell_level++; |
bb70624e JA |
1305 | should_redir_stdin = (asynchronous && (command->flags & CMD_STDIN_REDIR) && |
1306 | pipe_in == NO_PIPE && | |
1307 | stdin_redirects (command->redirects) == 0); | |
1308 | ||
28ef6c31 | 1309 | invert = (command->flags & CMD_INVERT_RETURN) != 0; |
bb70624e | 1310 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); |
3185942a | 1311 | user_coproc = command->type == cm_coproc; |
28ef6c31 | 1312 | |
bb70624e JA |
1313 | command->flags &= ~(CMD_FORCE_SUBSHELL | CMD_WANT_SUBSHELL | CMD_INVERT_RETURN); |
1314 | ||
1315 | /* If a command is asynchronous in a subshell (like ( foo ) & or | |
1316 | the special case of an asynchronous GROUP command where the | |
1317 | the subshell bit is turned on down in case cm_group: below), | |
1318 | turn off `asynchronous', so that two subshells aren't spawned. | |
0628567a JA |
1319 | XXX - asynchronous used to be set to 0 in this block, but that |
1320 | means that setup_async_signals was never run. Now it's set to | |
1321 | 0 after subshell_environment is set appropriately and setup_async_signals | |
1322 | is run. | |
bb70624e JA |
1323 | |
1324 | This seems semantically correct to me. For example, | |
1325 | ( foo ) & seems to say ``do the command `foo' in a subshell | |
1326 | environment, but don't wait for that subshell to finish'', | |
1327 | and "{ foo ; bar ; } &" seems to me to be like functions or | |
1328 | builtins in the background, which executed in a subshell | |
1329 | environment. I just don't see the need to fork two subshells. */ | |
1330 | ||
1331 | /* Don't fork again, we are already in a subshell. A `doubly | |
1332 | async' shell is not interactive, however. */ | |
1333 | if (asynchronous) | |
1334 | { | |
1335 | #if defined (JOB_CONTROL) | |
1336 | /* If a construct like ( exec xxx yyy ) & is given while job | |
1337 | control is active, we want to prevent exec from putting the | |
1338 | subshell back into the original process group, carefully | |
1339 | undoing all the work we just did in make_child. */ | |
1340 | original_pgrp = -1; | |
1341 | #endif /* JOB_CONTROL */ | |
28ef6c31 | 1342 | ois = interactive_shell; |
bb70624e | 1343 | interactive_shell = 0; |
28ef6c31 JA |
1344 | /* This test is to prevent alias expansion by interactive shells that |
1345 | run `(command) &' but to allow scripts that have enabled alias | |
1346 | expansion with `shopt -s expand_alias' to continue to expand | |
1347 | aliases. */ | |
1348 | if (ois != interactive_shell) | |
1349 | expand_aliases = 0; | |
bb70624e JA |
1350 | } |
1351 | ||
1352 | /* Subshells are neither login nor interactive. */ | |
1353 | login_shell = interactive = 0; | |
1354 | ||
0628567a JA |
1355 | if (user_subshell) |
1356 | subshell_environment = SUBSHELL_PAREN; | |
1357 | else | |
1358 | { | |
1359 | subshell_environment = 0; /* XXX */ | |
1360 | if (asynchronous) | |
1361 | subshell_environment |= SUBSHELL_ASYNC; | |
1362 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
1363 | subshell_environment |= SUBSHELL_PIPE; | |
3185942a JA |
1364 | if (user_coproc) |
1365 | subshell_environment |= SUBSHELL_COPROC; | |
0628567a | 1366 | } |
bb70624e JA |
1367 | |
1368 | reset_terminating_signals (); /* in sig.c */ | |
1369 | /* Cancel traps, in trap.c. */ | |
1370 | restore_original_signals (); | |
0628567a JA |
1371 | |
1372 | /* Make sure restore_original_signals doesn't undo the work done by | |
1373 | make_child to ensure that asynchronous children are immune to SIGINT | |
1374 | and SIGQUIT. Turn off asynchronous to make sure more subshells are | |
1375 | not spawned. */ | |
bb70624e | 1376 | if (asynchronous) |
0628567a JA |
1377 | { |
1378 | setup_async_signals (); | |
1379 | asynchronous = 0; | |
1380 | } | |
bb70624e JA |
1381 | |
1382 | #if defined (JOB_CONTROL) | |
1383 | set_sigchld_handler (); | |
1384 | #endif /* JOB_CONTROL */ | |
1385 | ||
1386 | set_sigint_handler (); | |
1387 | ||
1388 | #if defined (JOB_CONTROL) | |
1389 | /* Delete all traces that there were any jobs running. This is | |
1390 | only for subshells. */ | |
1391 | without_job_control (); | |
1392 | #endif /* JOB_CONTROL */ | |
1393 | ||
1394 | if (fds_to_close) | |
1395 | close_fd_bitmap (fds_to_close); | |
1396 | ||
1397 | do_piping (pipe_in, pipe_out); | |
1398 | ||
3185942a JA |
1399 | #if defined (COPROCESS_SUPPORT) |
1400 | coproc_closeall (); | |
1401 | #endif | |
1402 | ||
bb70624e JA |
1403 | /* If this is a user subshell, set a flag if stdin was redirected. |
1404 | This is used later to decide whether to redirect fd 0 to | |
1405 | /dev/null for async commands in the subshell. This adds more | |
1406 | sh compatibility, but I'm not sure it's the right thing to do. */ | |
1407 | if (user_subshell) | |
1408 | { | |
1409 | stdin_redir = stdin_redirects (command->redirects); | |
1410 | restore_default_signal (0); | |
1411 | } | |
1412 | ||
1413 | /* If this is an asynchronous command (command &), we want to | |
1414 | redirect the standard input from /dev/null in the absence of | |
1415 | any specific redirection involving stdin. */ | |
1416 | if (should_redir_stdin && stdin_redir == 0) | |
1417 | async_redirect_stdin (); | |
1418 | ||
1419 | /* Do redirections, then dispose of them before recursive call. */ | |
1420 | if (command->redirects) | |
1421 | { | |
b80f6443 | 1422 | if (do_redirections (command->redirects, RX_ACTIVE) != 0) |
28ef6c31 | 1423 | exit (invert ? EXECUTION_SUCCESS : EXECUTION_FAILURE); |
bb70624e JA |
1424 | |
1425 | dispose_redirects (command->redirects); | |
1426 | command->redirects = (REDIRECT *)NULL; | |
1427 | } | |
1428 | ||
3185942a JA |
1429 | if (command->type == cm_subshell) |
1430 | tcom = command->value.Subshell->command; | |
1431 | else if (user_coproc) | |
1432 | tcom = command->value.Coproc->command; | |
1433 | else | |
1434 | tcom = command; | |
bb70624e | 1435 | |
95732b49 JA |
1436 | if (command->flags & CMD_TIME_PIPELINE) |
1437 | tcom->flags |= CMD_TIME_PIPELINE; | |
1438 | if (command->flags & CMD_TIME_POSIX) | |
1439 | tcom->flags |= CMD_TIME_POSIX; | |
1440 | ||
f73dda09 JA |
1441 | /* Make sure the subshell inherits any CMD_IGNORE_RETURN flag. */ |
1442 | if ((command->flags & CMD_IGNORE_RETURN) && tcom != command) | |
1443 | tcom->flags |= CMD_IGNORE_RETURN; | |
1444 | ||
bb70624e JA |
1445 | /* If this is a simple command, tell execute_disk_command that it |
1446 | might be able to get away without forking and simply exec. | |
1447 | This means things like ( sleep 10 ) will only cause one fork. | |
28ef6c31 JA |
1448 | If we're timing the command or inverting its return value, however, |
1449 | we cannot do this optimization. */ | |
3185942a | 1450 | if ((user_subshell || user_coproc) && (tcom->type == cm_simple || tcom->type == cm_subshell) && |
28ef6c31 JA |
1451 | ((tcom->flags & CMD_TIME_PIPELINE) == 0) && |
1452 | ((tcom->flags & CMD_INVERT_RETURN) == 0)) | |
bb70624e JA |
1453 | { |
1454 | tcom->flags |= CMD_NO_FORK; | |
1455 | if (tcom->type == cm_simple) | |
1456 | tcom->value.Simple->flags |= CMD_NO_FORK; | |
1457 | } | |
1458 | ||
28ef6c31 JA |
1459 | invert = (tcom->flags & CMD_INVERT_RETURN) != 0; |
1460 | tcom->flags &= ~CMD_INVERT_RETURN; | |
1461 | ||
0001803f CR |
1462 | result = setjmp (top_level); |
1463 | ||
bb70624e JA |
1464 | /* If we're inside a function while executing this subshell, we |
1465 | need to handle a possible `return'. */ | |
1466 | function_value = 0; | |
1467 | if (return_catch_flag) | |
1468 | function_value = setjmp (return_catch); | |
1469 | ||
0001803f CR |
1470 | /* If we're going to exit the shell, we don't want to invert the return |
1471 | status. */ | |
1472 | if (result == EXITPROG) | |
1473 | invert = 0, return_code = last_command_exit_value; | |
1474 | else if (result) | |
1475 | return_code = EXECUTION_FAILURE; | |
1476 | else if (function_value) | |
bb70624e JA |
1477 | return_code = return_catch_value; |
1478 | else | |
0628567a | 1479 | return_code = execute_command_internal (tcom, asynchronous, NO_PIPE, NO_PIPE, fds_to_close); |
bb70624e | 1480 | |
28ef6c31 JA |
1481 | /* If we are asked to, invert the return value. */ |
1482 | if (invert) | |
1483 | return_code = (return_code == EXECUTION_SUCCESS) ? EXECUTION_FAILURE | |
1484 | : EXECUTION_SUCCESS; | |
1485 | ||
bb70624e JA |
1486 | /* If we were explicitly placed in a subshell with (), we need |
1487 | to do the `shell cleanup' things, such as running traps[0]. */ | |
1488 | if (user_subshell && signal_is_trapped (0)) | |
1489 | { | |
1490 | last_command_exit_value = return_code; | |
1491 | return_code = run_exit_trap (); | |
1492 | } | |
1493 | ||
b80f6443 | 1494 | subshell_level--; |
bb70624e JA |
1495 | return (return_code); |
1496 | /* NOTREACHED */ | |
1497 | } | |
1498 | ||
3185942a JA |
1499 | #if defined (COPROCESS_SUPPORT) |
1500 | #define COPROC_MAX 16 | |
1501 | ||
1502 | typedef struct cpelement | |
1503 | { | |
1504 | struct cpelement *next; | |
1505 | struct coproc *coproc; | |
1506 | } | |
1507 | cpelement_t; | |
1508 | ||
1509 | typedef struct cplist | |
1510 | { | |
1511 | struct cpelement *head; | |
1512 | struct cpelement *tail; | |
1513 | int ncoproc; | |
1514 | } | |
1515 | cplist_t; | |
1516 | ||
1517 | static struct cpelement *cpe_alloc __P((struct coproc *)); | |
1518 | static void cpe_dispose __P((struct cpelement *)); | |
1519 | static struct cpelement *cpl_add __P((struct coproc *)); | |
1520 | static struct cpelement *cpl_delete __P((pid_t)); | |
17345e5a | 1521 | static void cpl_reap __P((void)); |
3185942a JA |
1522 | static void cpl_flush __P((void)); |
1523 | static struct cpelement *cpl_search __P((pid_t)); | |
1524 | static struct cpelement *cpl_searchbyname __P((char *)); | |
1525 | static void cpl_prune __P((void)); | |
1526 | ||
1527 | Coproc sh_coproc = { 0, NO_PID, -1, -1, 0, 0 }; | |
1528 | ||
1529 | cplist_t coproc_list = {0, 0, 0}; | |
1530 | ||
17345e5a | 1531 | /* Functions to manage the list of coprocs */ |
3185942a JA |
1532 | |
1533 | static struct cpelement * | |
1534 | cpe_alloc (cp) | |
1535 | Coproc *cp; | |
1536 | { | |
1537 | struct cpelement *cpe; | |
1538 | ||
1539 | cpe = (struct cpelement *)xmalloc (sizeof (struct cpelement)); | |
1540 | cpe->coproc = cp; | |
1541 | cpe->next = (struct cpelement *)0; | |
1542 | return cpe; | |
1543 | } | |
1544 | ||
1545 | static void | |
1546 | cpe_dispose (cpe) | |
1547 | struct cpelement *cpe; | |
1548 | { | |
1549 | free (cpe); | |
1550 | } | |
1551 | ||
1552 | static struct cpelement * | |
1553 | cpl_add (cp) | |
1554 | Coproc *cp; | |
1555 | { | |
1556 | struct cpelement *cpe; | |
1557 | ||
1558 | cpe = cpe_alloc (cp); | |
1559 | ||
1560 | if (coproc_list.head == 0) | |
1561 | { | |
1562 | coproc_list.head = coproc_list.tail = cpe; | |
1563 | coproc_list.ncoproc = 0; /* just to make sure */ | |
1564 | } | |
1565 | else | |
1566 | { | |
1567 | coproc_list.tail->next = cpe; | |
1568 | coproc_list.tail = cpe; | |
1569 | } | |
1570 | coproc_list.ncoproc++; | |
1571 | ||
1572 | return cpe; | |
1573 | } | |
1574 | ||
1575 | static struct cpelement * | |
1576 | cpl_delete (pid) | |
1577 | pid_t pid; | |
1578 | { | |
1579 | struct cpelement *prev, *p; | |
1580 | ||
1581 | for (prev = p = coproc_list.head; p; prev = p, p = p->next) | |
1582 | if (p->coproc->c_pid == pid) | |
1583 | { | |
1584 | prev->next = p->next; /* remove from list */ | |
1585 | break; | |
1586 | } | |
1587 | ||
1588 | if (p == 0) | |
1589 | return 0; /* not found */ | |
1590 | ||
1591 | #if defined (DEBUG) | |
1592 | itrace("cpl_delete: deleting %d", pid); | |
1593 | #endif | |
1594 | ||
1595 | /* Housekeeping in the border cases. */ | |
1596 | if (p == coproc_list.head) | |
1597 | coproc_list.head = coproc_list.head->next; | |
1598 | else if (p == coproc_list.tail) | |
1599 | coproc_list.tail = prev; | |
1600 | ||
1601 | coproc_list.ncoproc--; | |
1602 | if (coproc_list.ncoproc == 0) | |
1603 | coproc_list.head = coproc_list.tail = 0; | |
1604 | else if (coproc_list.ncoproc == 1) | |
1605 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1606 | ||
1607 | return (p); | |
1608 | } | |
1609 | ||
17345e5a JA |
1610 | static void |
1611 | cpl_reap () | |
1612 | { | |
1613 | struct cpelement *prev, *p; | |
1614 | ||
1615 | for (prev = p = coproc_list.head; p; prev = p, p = p->next) | |
1616 | if (p->coproc->c_flags & COPROC_DEAD) | |
1617 | { | |
1618 | prev->next = p->next; /* remove from list */ | |
1619 | ||
1620 | /* Housekeeping in the border cases. */ | |
1621 | if (p == coproc_list.head) | |
1622 | coproc_list.head = coproc_list.head->next; | |
1623 | else if (p == coproc_list.tail) | |
1624 | coproc_list.tail = prev; | |
1625 | ||
1626 | coproc_list.ncoproc--; | |
1627 | if (coproc_list.ncoproc == 0) | |
1628 | coproc_list.head = coproc_list.tail = 0; | |
1629 | else if (coproc_list.ncoproc == 1) | |
1630 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1631 | ||
1632 | #if defined (DEBUG) | |
1633 | itrace("cpl_reap: deleting %d", p->coproc->c_pid); | |
1634 | #endif | |
1635 | ||
1636 | coproc_dispose (p->coproc); | |
1637 | cpe_dispose (p); | |
1638 | } | |
1639 | } | |
1640 | ||
3185942a JA |
1641 | /* Clear out the list of saved statuses */ |
1642 | static void | |
1643 | cpl_flush () | |
1644 | { | |
1645 | struct cpelement *cpe, *p; | |
1646 | ||
1647 | for (cpe = coproc_list.head; cpe; ) | |
1648 | { | |
1649 | p = cpe; | |
1650 | cpe = cpe->next; | |
1651 | ||
1652 | coproc_dispose (p->coproc); | |
1653 | cpe_dispose (p); | |
1654 | } | |
1655 | ||
1656 | coproc_list.head = coproc_list.tail = 0; | |
1657 | coproc_list.ncoproc = 0; | |
1658 | } | |
1659 | ||
1660 | /* Search for PID in the list of coprocs; return the cpelement struct if | |
1661 | found. If not found, return NULL. */ | |
1662 | static struct cpelement * | |
1663 | cpl_search (pid) | |
1664 | pid_t pid; | |
1665 | { | |
1666 | struct cpelement *cp; | |
1667 | ||
1668 | for (cp = coproc_list.head ; cp; cp = cp->next) | |
1669 | if (cp->coproc->c_pid == pid) | |
1670 | return cp; | |
1671 | return (struct cpelement *)NULL; | |
1672 | } | |
1673 | ||
1674 | /* Search for the coproc named NAME in the list of coprocs; return the | |
1675 | cpelement struct if found. If not found, return NULL. */ | |
1676 | static struct cpelement * | |
1677 | cpl_searchbyname (name) | |
1678 | char *name; | |
1679 | { | |
1680 | struct cpelement *cp; | |
1681 | ||
1682 | for (cp = coproc_list.head ; cp; cp = cp->next) | |
1683 | if (STREQ (cp->coproc->c_name, name)) | |
1684 | return cp; | |
1685 | return (struct cpelement *)NULL; | |
1686 | } | |
1687 | ||
1688 | #if 0 | |
1689 | static void | |
1690 | cpl_prune () | |
1691 | { | |
1692 | struct cpelement *cp; | |
1693 | ||
1694 | while (coproc_list.head && coproc_list.ncoproc > COPROC_MAX) | |
1695 | { | |
1696 | cp = coproc_list.head; | |
1697 | coproc_list.head = coproc_list.head->next; | |
1698 | coproc_dispose (cp->coproc); | |
1699 | cpe_dispose (cp); | |
1700 | coproc_list.ncoproc--; | |
1701 | } | |
1702 | } | |
1703 | #endif | |
1704 | ||
1705 | /* These currently use a single global "shell coproc" but are written in a | |
1706 | way to not preclude additional coprocs later (using the list management | |
1707 | package above). */ | |
1708 | ||
1709 | struct coproc * | |
1710 | getcoprocbypid (pid) | |
1711 | pid_t pid; | |
1712 | { | |
1713 | return (pid == sh_coproc.c_pid ? &sh_coproc : 0); | |
1714 | } | |
1715 | ||
1716 | struct coproc * | |
1717 | getcoprocbyname (name) | |
1718 | const char *name; | |
1719 | { | |
1720 | return ((sh_coproc.c_name && STREQ (sh_coproc.c_name, name)) ? &sh_coproc : 0); | |
1721 | } | |
1722 | ||
1723 | void | |
1724 | coproc_init (cp) | |
1725 | struct coproc *cp; | |
1726 | { | |
1727 | cp->c_name = 0; | |
1728 | cp->c_pid = NO_PID; | |
1729 | cp->c_rfd = cp->c_wfd = -1; | |
1730 | cp->c_rsave = cp->c_wsave = -1; | |
1731 | cp->c_flags = cp->c_status = 0; | |
1732 | } | |
1733 | ||
1734 | struct coproc * | |
1735 | coproc_alloc (name, pid) | |
1736 | char *name; | |
1737 | pid_t pid; | |
1738 | { | |
1739 | struct coproc *cp; | |
1740 | ||
1741 | cp = &sh_coproc; /* XXX */ | |
1742 | coproc_init (cp); | |
1743 | ||
1744 | cp->c_name = savestring (name); | |
1745 | cp->c_pid = pid; | |
1746 | ||
1747 | return (cp); | |
1748 | } | |
1749 | ||
1750 | void | |
1751 | coproc_dispose (cp) | |
1752 | struct coproc *cp; | |
1753 | { | |
1754 | if (cp == 0) | |
1755 | return; | |
1756 | ||
1757 | coproc_unsetvars (cp); | |
1758 | FREE (cp->c_name); | |
1759 | coproc_close (cp); | |
1760 | coproc_init (cp); | |
1761 | } | |
1762 | ||
1763 | /* Placeholder for now. */ | |
1764 | void | |
1765 | coproc_flush () | |
1766 | { | |
1767 | coproc_dispose (&sh_coproc); | |
1768 | } | |
1769 | ||
1770 | void | |
1771 | coproc_close (cp) | |
1772 | struct coproc *cp; | |
1773 | { | |
1774 | if (cp->c_rfd >= 0) | |
1775 | { | |
1776 | close (cp->c_rfd); | |
1777 | cp->c_rfd = -1; | |
1778 | } | |
1779 | if (cp->c_wfd >= 0) | |
1780 | { | |
1781 | close (cp->c_wfd); | |
1782 | cp->c_wfd = -1; | |
1783 | } | |
1784 | cp->c_rsave = cp->c_wsave = -1; | |
1785 | } | |
1786 | ||
1787 | void | |
1788 | coproc_closeall () | |
1789 | { | |
1790 | coproc_close (&sh_coproc); | |
1791 | } | |
1792 | ||
17345e5a JA |
1793 | void |
1794 | coproc_reap () | |
1795 | { | |
1796 | struct coproc *cp; | |
1797 | ||
1798 | cp = &sh_coproc; | |
1799 | if (cp && (cp->c_flags & COPROC_DEAD)) | |
1800 | coproc_dispose (cp); | |
1801 | } | |
1802 | ||
3185942a JA |
1803 | void |
1804 | coproc_rclose (cp, fd) | |
1805 | struct coproc *cp; | |
1806 | int fd; | |
1807 | { | |
1808 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
1809 | { | |
1810 | close (cp->c_rfd); | |
1811 | cp->c_rfd = -1; | |
1812 | } | |
1813 | } | |
1814 | ||
1815 | void | |
1816 | coproc_wclose (cp, fd) | |
1817 | struct coproc *cp; | |
1818 | int fd; | |
1819 | { | |
1820 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
1821 | { | |
1822 | close (cp->c_wfd); | |
1823 | cp->c_wfd = -1; | |
1824 | } | |
1825 | } | |
1826 | ||
1827 | void | |
1828 | coproc_checkfd (cp, fd) | |
1829 | struct coproc *cp; | |
1830 | int fd; | |
1831 | { | |
1832 | int update; | |
1833 | ||
1834 | update = 0; | |
1835 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
1836 | update = cp->c_rfd = -1; | |
1837 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
1838 | update = cp->c_wfd = -1; | |
1839 | if (update) | |
1840 | coproc_setvars (cp); | |
1841 | } | |
1842 | ||
1843 | void | |
1844 | coproc_fdchk (fd) | |
1845 | int fd; | |
1846 | { | |
1847 | coproc_checkfd (&sh_coproc, fd); | |
1848 | } | |
1849 | ||
1850 | void | |
1851 | coproc_fdclose (cp, fd) | |
1852 | struct coproc *cp; | |
1853 | int fd; | |
1854 | { | |
1855 | coproc_rclose (cp, fd); | |
1856 | coproc_wclose (cp, fd); | |
1857 | coproc_setvars (cp); | |
1858 | } | |
1859 | ||
1860 | void | |
1861 | coproc_fdsave (cp) | |
1862 | struct coproc *cp; | |
1863 | { | |
1864 | cp->c_rsave = cp->c_rfd; | |
1865 | cp->c_wsave = cp->c_wfd; | |
1866 | } | |
1867 | ||
1868 | void | |
1869 | coproc_fdrestore (cp) | |
1870 | struct coproc *cp; | |
1871 | { | |
1872 | cp->c_rfd = cp->c_rsave; | |
1873 | cp->c_wfd = cp->c_wsave; | |
1874 | } | |
17345e5a | 1875 | |
3185942a | 1876 | void |
17345e5a | 1877 | coproc_pidchk (pid, status) |
3185942a JA |
1878 | pid_t pid; |
1879 | { | |
1880 | struct coproc *cp; | |
1881 | ||
1882 | cp = getcoprocbypid (pid); | |
1883 | #if 0 | |
1884 | if (cp) | |
1885 | itrace("coproc_pidchk: pid %d has died", pid); | |
1886 | #endif | |
1887 | if (cp) | |
17345e5a JA |
1888 | { |
1889 | cp->c_status = status; | |
1890 | cp->c_flags |= COPROC_DEAD; | |
1891 | cp->c_flags &= ~COPROC_RUNNING; | |
1892 | #if 0 | |
1893 | coproc_dispose (cp); | |
1894 | #endif | |
1895 | } | |
3185942a JA |
1896 | } |
1897 | ||
1898 | void | |
1899 | coproc_setvars (cp) | |
1900 | struct coproc *cp; | |
1901 | { | |
1902 | SHELL_VAR *v; | |
1903 | char *namevar, *t; | |
1904 | int l; | |
1905 | #if defined (ARRAY_VARS) | |
1906 | arrayind_t ind; | |
1907 | #endif | |
1908 | ||
1909 | if (cp->c_name == 0) | |
1910 | return; | |
1911 | ||
1912 | l = strlen (cp->c_name); | |
1913 | namevar = xmalloc (l + 16); | |
1914 | ||
1915 | #if defined (ARRAY_VARS) | |
1916 | v = find_variable (cp->c_name); | |
1917 | if (v == 0) | |
1918 | v = make_new_array_variable (cp->c_name); | |
1919 | if (array_p (v) == 0) | |
1920 | v = convert_var_to_array (v); | |
1921 | ||
1922 | t = itos (cp->c_rfd); | |
1923 | ind = 0; | |
1924 | v = bind_array_variable (cp->c_name, ind, t, 0); | |
1925 | free (t); | |
1926 | ||
1927 | t = itos (cp->c_wfd); | |
1928 | ind = 1; | |
1929 | bind_array_variable (cp->c_name, ind, t, 0); | |
1930 | free (t); | |
1931 | #else | |
1932 | sprintf (namevar, "%s_READ", cp->c_name); | |
1933 | t = itos (cp->c_rfd); | |
1934 | bind_variable (namevar, t, 0); | |
1935 | free (t); | |
1936 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
1937 | t = itos (cp->c_wfd); | |
1938 | bind_variable (namevar, t, 0); | |
1939 | free (t); | |
1940 | #endif | |
1941 | ||
1942 | sprintf (namevar, "%s_PID", cp->c_name); | |
1943 | t = itos (cp->c_pid); | |
1944 | bind_variable (namevar, t, 0); | |
1945 | free (t); | |
1946 | ||
1947 | free (namevar); | |
1948 | } | |
1949 | ||
1950 | void | |
1951 | coproc_unsetvars (cp) | |
1952 | struct coproc *cp; | |
1953 | { | |
1954 | int l; | |
1955 | char *namevar; | |
1956 | ||
1957 | if (cp->c_name == 0) | |
1958 | return; | |
1959 | ||
1960 | l = strlen (cp->c_name); | |
1961 | namevar = xmalloc (l + 16); | |
1962 | ||
1963 | sprintf (namevar, "%s_PID", cp->c_name); | |
1964 | unbind_variable (namevar); | |
1965 | ||
1966 | #if defined (ARRAY_VARS) | |
1967 | unbind_variable (cp->c_name); | |
1968 | #else | |
1969 | sprintf (namevar, "%s_READ", cp->c_name); | |
1970 | unbind_variable (namevar); | |
1971 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
1972 | unbind_variable (namevar); | |
1973 | #endif | |
1974 | ||
1975 | free (namevar); | |
1976 | } | |
1977 | ||
1978 | static int | |
1979 | execute_coproc (command, pipe_in, pipe_out, fds_to_close) | |
1980 | COMMAND *command; | |
1981 | int pipe_in, pipe_out; | |
1982 | struct fd_bitmap *fds_to_close; | |
1983 | { | |
0001803f | 1984 | int rpipe[2], wpipe[2], estat; |
3185942a JA |
1985 | pid_t coproc_pid; |
1986 | Coproc *cp; | |
1987 | char *tcmd; | |
1988 | ||
1989 | /* XXX -- will require changes to handle multiple coprocs */ | |
1990 | if (sh_coproc.c_pid != NO_PID) | |
1991 | { | |
1992 | #if 0 | |
1993 | internal_error ("execute_coproc: coproc [%d:%s] already exists", sh_coproc.c_pid, sh_coproc.c_name); | |
1994 | return (last_command_exit_value = EXECUTION_FAILURE); | |
1995 | #else | |
1996 | internal_warning ("execute_coproc: coproc [%d:%s] still exists", sh_coproc.c_pid, sh_coproc.c_name); | |
1997 | #endif | |
1998 | } | |
1999 | coproc_init (&sh_coproc); | |
2000 | ||
2001 | command_string_index = 0; | |
2002 | tcmd = make_command_string (command); | |
2003 | ||
2004 | sh_openpipe ((int *)&rpipe); /* 0 = parent read, 1 = child write */ | |
2005 | sh_openpipe ((int *)&wpipe); /* 0 = child read, 1 = parent write */ | |
2006 | ||
2007 | coproc_pid = make_child (savestring (tcmd), 1); | |
2008 | if (coproc_pid == 0) | |
2009 | { | |
2010 | close (rpipe[0]); | |
2011 | close (wpipe[1]); | |
2012 | ||
0001803f CR |
2013 | estat = execute_in_subshell (command, 1, wpipe[0], rpipe[1], fds_to_close); |
2014 | ||
2015 | fflush (stdout); | |
2016 | fflush (stderr); | |
2017 | ||
2018 | exit (estat); | |
3185942a JA |
2019 | } |
2020 | ||
2021 | close (rpipe[1]); | |
2022 | close (wpipe[0]); | |
2023 | ||
2024 | cp = coproc_alloc (command->value.Coproc->name, coproc_pid); | |
2025 | cp->c_rfd = rpipe[0]; | |
2026 | cp->c_wfd = wpipe[1]; | |
2027 | ||
2028 | SET_CLOSE_ON_EXEC (cp->c_rfd); | |
2029 | SET_CLOSE_ON_EXEC (cp->c_wfd); | |
2030 | ||
2031 | coproc_setvars (cp); | |
2032 | ||
2033 | #if 0 | |
2034 | itrace ("execute_coproc: [%d] %s", coproc_pid, the_printed_command); | |
2035 | #endif | |
2036 | ||
2037 | close_pipes (pipe_in, pipe_out); | |
2038 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
2039 | unlink_fifo_list (); | |
2040 | #endif | |
2041 | stop_pipeline (1, (COMMAND *)NULL); | |
2042 | DESCRIBE_PID (coproc_pid); | |
2043 | run_pending_traps (); | |
2044 | ||
2045 | return (EXECUTION_SUCCESS); | |
2046 | } | |
2047 | #endif | |
2048 | ||
ccc6cda3 JA |
2049 | static int |
2050 | execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2051 | COMMAND *command; | |
2052 | int asynchronous, pipe_in, pipe_out; | |
2053 | struct fd_bitmap *fds_to_close; | |
2054 | { | |
2055 | int prev, fildes[2], new_bitmap_size, dummyfd, ignore_return, exec_result; | |
2056 | COMMAND *cmd; | |
2057 | struct fd_bitmap *fd_bitmap; | |
726f6388 JA |
2058 | |
2059 | #if defined (JOB_CONTROL) | |
ccc6cda3 JA |
2060 | sigset_t set, oset; |
2061 | BLOCK_CHILD (set, oset); | |
726f6388 JA |
2062 | #endif /* JOB_CONTROL */ |
2063 | ||
ccc6cda3 | 2064 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; |
726f6388 | 2065 | |
ccc6cda3 JA |
2066 | prev = pipe_in; |
2067 | cmd = command; | |
2068 | ||
2069 | while (cmd && cmd->type == cm_connection && | |
2070 | cmd->value.Connection && cmd->value.Connection->connector == '|') | |
2071 | { | |
2072 | /* Make a pipeline between the two commands. */ | |
2073 | if (pipe (fildes) < 0) | |
2074 | { | |
3185942a | 2075 | sys_error (_("pipe error")); |
726f6388 | 2076 | #if defined (JOB_CONTROL) |
ccc6cda3 JA |
2077 | terminate_current_pipeline (); |
2078 | kill_current_pipeline (); | |
95732b49 | 2079 | UNBLOCK_CHILD (oset); |
726f6388 | 2080 | #endif /* JOB_CONTROL */ |
ccc6cda3 JA |
2081 | last_command_exit_value = EXECUTION_FAILURE; |
2082 | /* The unwind-protects installed below will take care | |
2083 | of closing all of the open file descriptors. */ | |
2084 | throw_to_top_level (); | |
2085 | return (EXECUTION_FAILURE); /* XXX */ | |
2086 | } | |
2087 | ||
2088 | /* Here is a problem: with the new file close-on-exec | |
2089 | code, the read end of the pipe (fildes[0]) stays open | |
2090 | in the first process, so that process will never get a | |
2091 | SIGPIPE. There is no way to signal the first process | |
2092 | that it should close fildes[0] after forking, so it | |
2093 | remains open. No SIGPIPE is ever sent because there | |
2094 | is still a file descriptor open for reading connected | |
2095 | to the pipe. We take care of that here. This passes | |
2096 | around a bitmap of file descriptors that must be | |
2097 | closed after making a child process in execute_simple_command. */ | |
2098 | ||
2099 | /* We need fd_bitmap to be at least as big as fildes[0]. | |
2100 | If fildes[0] is less than fds_to_close->size, then | |
2101 | use fds_to_close->size. */ | |
2102 | new_bitmap_size = (fildes[0] < fds_to_close->size) | |
2103 | ? fds_to_close->size | |
2104 | : fildes[0] + 8; | |
2105 | ||
2106 | fd_bitmap = new_fd_bitmap (new_bitmap_size); | |
2107 | ||
2108 | /* Now copy the old information into the new bitmap. */ | |
2109 | xbcopy ((char *)fds_to_close->bitmap, (char *)fd_bitmap->bitmap, fds_to_close->size); | |
2110 | ||
2111 | /* And mark the pipe file descriptors to be closed. */ | |
2112 | fd_bitmap->bitmap[fildes[0]] = 1; | |
2113 | ||
2114 | /* In case there are pipe or out-of-processes errors, we | |
cce855bc | 2115 | want all these file descriptors to be closed when |
ccc6cda3 JA |
2116 | unwind-protects are run, and the storage used for the |
2117 | bitmaps freed up. */ | |
2118 | begin_unwind_frame ("pipe-file-descriptors"); | |
2119 | add_unwind_protect (dispose_fd_bitmap, fd_bitmap); | |
2120 | add_unwind_protect (close_fd_bitmap, fd_bitmap); | |
2121 | if (prev >= 0) | |
2122 | add_unwind_protect (close, prev); | |
2123 | dummyfd = fildes[1]; | |
2124 | add_unwind_protect (close, dummyfd); | |
726f6388 JA |
2125 | |
2126 | #if defined (JOB_CONTROL) | |
f73dda09 | 2127 | add_unwind_protect (restore_signal_mask, &oset); |
726f6388 JA |
2128 | #endif /* JOB_CONTROL */ |
2129 | ||
ccc6cda3 JA |
2130 | if (ignore_return && cmd->value.Connection->first) |
2131 | cmd->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2132 | execute_command_internal (cmd->value.Connection->first, asynchronous, | |
2133 | prev, fildes[1], fd_bitmap); | |
2134 | ||
2135 | if (prev >= 0) | |
2136 | close (prev); | |
2137 | ||
2138 | prev = fildes[0]; | |
2139 | close (fildes[1]); | |
2140 | ||
2141 | dispose_fd_bitmap (fd_bitmap); | |
2142 | discard_unwind_frame ("pipe-file-descriptors"); | |
726f6388 | 2143 | |
ccc6cda3 JA |
2144 | cmd = cmd->value.Connection->second; |
2145 | } | |
2146 | ||
2147 | /* Now execute the rightmost command in the pipeline. */ | |
2148 | if (ignore_return && cmd) | |
2149 | cmd->flags |= CMD_IGNORE_RETURN; | |
2150 | exec_result = execute_command_internal (cmd, asynchronous, prev, pipe_out, fds_to_close); | |
726f6388 | 2151 | |
ccc6cda3 JA |
2152 | if (prev >= 0) |
2153 | close (prev); | |
726f6388 JA |
2154 | |
2155 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 2156 | UNBLOCK_CHILD (oset); |
726f6388 | 2157 | #endif |
726f6388 | 2158 | |
3185942a | 2159 | QUIT; |
ccc6cda3 JA |
2160 | return (exec_result); |
2161 | } | |
2162 | ||
2163 | static int | |
2164 | execute_connection (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2165 | COMMAND *command; | |
2166 | int asynchronous, pipe_in, pipe_out; | |
2167 | struct fd_bitmap *fds_to_close; | |
2168 | { | |
d166f048 | 2169 | REDIRECT *rp; |
ccc6cda3 | 2170 | COMMAND *tc, *second; |
17345e5a | 2171 | int ignore_return, exec_result, was_error_trap, invert; |
89a92869 | 2172 | volatile int save_line_number; |
ccc6cda3 JA |
2173 | |
2174 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2175 | ||
2176 | switch (command->value.Connection->connector) | |
2177 | { | |
2178 | /* Do the first command asynchronously. */ | |
2179 | case '&': | |
2180 | tc = command->value.Connection->first; | |
2181 | if (tc == 0) | |
2182 | return (EXECUTION_SUCCESS); | |
2183 | ||
2184 | rp = tc->redirects; | |
2185 | ||
d166f048 | 2186 | if (ignore_return) |
ccc6cda3 | 2187 | tc->flags |= CMD_IGNORE_RETURN; |
d166f048 | 2188 | tc->flags |= CMD_AMPERSAND; |
ccc6cda3 | 2189 | |
f73dda09 JA |
2190 | /* If this shell was compiled without job control support, |
2191 | if we are currently in a subshell via `( xxx )', or if job | |
2192 | control is not active then the standard input for an | |
2193 | asynchronous command is forced to /dev/null. */ | |
ccc6cda3 | 2194 | #if defined (JOB_CONTROL) |
f73dda09 | 2195 | if ((subshell_environment || !job_control) && !stdin_redir) |
ccc6cda3 JA |
2196 | #else |
2197 | if (!stdin_redir) | |
2198 | #endif /* JOB_CONTROL */ | |
7117c2d2 | 2199 | tc->flags |= CMD_STDIN_REDIR; |
ccc6cda3 JA |
2200 | |
2201 | exec_result = execute_command_internal (tc, 1, pipe_in, pipe_out, fds_to_close); | |
3185942a | 2202 | QUIT; |
ccc6cda3 | 2203 | |
d166f048 | 2204 | if (tc->flags & CMD_STDIN_REDIR) |
7117c2d2 | 2205 | tc->flags &= ~CMD_STDIN_REDIR; |
726f6388 | 2206 | |
ccc6cda3 JA |
2207 | second = command->value.Connection->second; |
2208 | if (second) | |
2209 | { | |
2210 | if (ignore_return) | |
2211 | second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2212 | |
ccc6cda3 JA |
2213 | exec_result = execute_command_internal (second, asynchronous, pipe_in, pipe_out, fds_to_close); |
2214 | } | |
726f6388 | 2215 | |
ccc6cda3 | 2216 | break; |
726f6388 | 2217 | |
ccc6cda3 JA |
2218 | /* Just call execute command on both sides. */ |
2219 | case ';': | |
2220 | if (ignore_return) | |
2221 | { | |
2222 | if (command->value.Connection->first) | |
2223 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2224 | if (command->value.Connection->second) | |
2225 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2226 | } |
3185942a | 2227 | executing_list++; |
ccc6cda3 JA |
2228 | QUIT; |
2229 | execute_command (command->value.Connection->first); | |
2230 | QUIT; | |
2231 | exec_result = execute_command_internal (command->value.Connection->second, | |
2232 | asynchronous, pipe_in, pipe_out, | |
2233 | fds_to_close); | |
3185942a | 2234 | executing_list--; |
726f6388 JA |
2235 | break; |
2236 | ||
ccc6cda3 | 2237 | case '|': |
17345e5a JA |
2238 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; |
2239 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
2240 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2241 | ||
89a92869 | 2242 | line_number_for_err_trap = line_number; |
ccc6cda3 | 2243 | exec_result = execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close); |
17345e5a JA |
2244 | |
2245 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
2246 | { | |
2247 | last_command_exit_value = exec_result; | |
89a92869 CR |
2248 | save_line_number = line_number; |
2249 | line_number = line_number_for_err_trap; | |
17345e5a | 2250 | run_error_trap (); |
89a92869 | 2251 | line_number = save_line_number; |
17345e5a JA |
2252 | } |
2253 | ||
2254 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
2255 | { | |
2256 | last_command_exit_value = exec_result; | |
2257 | run_pending_traps (); | |
2258 | jump_to_top_level (ERREXIT); | |
2259 | } | |
2260 | ||
726f6388 JA |
2261 | break; |
2262 | ||
ccc6cda3 JA |
2263 | case AND_AND: |
2264 | case OR_OR: | |
2265 | if (asynchronous) | |
2266 | { | |
2267 | /* If we have something like `a && b &' or `a || b &', run the | |
2268 | && or || stuff in a subshell. Force a subshell and just call | |
2269 | execute_command_internal again. Leave asynchronous on | |
2270 | so that we get a report from the parent shell about the | |
2271 | background job. */ | |
2272 | command->flags |= CMD_FORCE_SUBSHELL; | |
2273 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
2274 | break; | |
2275 | } | |
726f6388 | 2276 | |
ccc6cda3 JA |
2277 | /* Execute the first command. If the result of that is successful |
2278 | and the connector is AND_AND, or the result is not successful | |
2279 | and the connector is OR_OR, then execute the second command, | |
2280 | otherwise return. */ | |
726f6388 | 2281 | |
3185942a | 2282 | executing_list++; |
ccc6cda3 JA |
2283 | if (command->value.Connection->first) |
2284 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2285 | |
ccc6cda3 JA |
2286 | exec_result = execute_command (command->value.Connection->first); |
2287 | QUIT; | |
2288 | if (((command->value.Connection->connector == AND_AND) && | |
2289 | (exec_result == EXECUTION_SUCCESS)) || | |
2290 | ((command->value.Connection->connector == OR_OR) && | |
2291 | (exec_result != EXECUTION_SUCCESS))) | |
2292 | { | |
2293 | if (ignore_return && command->value.Connection->second) | |
2294 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
726f6388 | 2295 | |
ccc6cda3 JA |
2296 | exec_result = execute_command (command->value.Connection->second); |
2297 | } | |
3185942a | 2298 | executing_list--; |
ccc6cda3 JA |
2299 | break; |
2300 | ||
2301 | default: | |
b72432fd | 2302 | command_error ("execute_connection", CMDERR_BADCONN, command->value.Connection->connector, 0); |
ccc6cda3 JA |
2303 | jump_to_top_level (DISCARD); |
2304 | exec_result = EXECUTION_FAILURE; | |
726f6388 JA |
2305 | } |
2306 | ||
ccc6cda3 | 2307 | return exec_result; |
726f6388 JA |
2308 | } |
2309 | ||
bb70624e JA |
2310 | #define REAP() \ |
2311 | do \ | |
2312 | { \ | |
2313 | if (!interactive_shell) \ | |
2314 | reap_dead_jobs (); \ | |
2315 | } \ | |
2316 | while (0) | |
726f6388 JA |
2317 | |
2318 | /* Execute a FOR command. The syntax is: FOR word_desc IN word_list; | |
2319 | DO command; DONE */ | |
ccc6cda3 | 2320 | static int |
726f6388 JA |
2321 | execute_for_command (for_command) |
2322 | FOR_COM *for_command; | |
2323 | { | |
726f6388 | 2324 | register WORD_LIST *releaser, *list; |
ccc6cda3 | 2325 | SHELL_VAR *v; |
726f6388 | 2326 | char *identifier; |
b80f6443 | 2327 | int retval, save_line_number; |
ccc6cda3 | 2328 | #if 0 |
726f6388 | 2329 | SHELL_VAR *old_value = (SHELL_VAR *)NULL; /* Remember the old value of x. */ |
ccc6cda3 | 2330 | #endif |
726f6388 | 2331 | |
b80f6443 | 2332 | save_line_number = line_number; |
726f6388 | 2333 | if (check_identifier (for_command->name, 1) == 0) |
ccc6cda3 JA |
2334 | { |
2335 | if (posixly_correct && interactive_shell == 0) | |
cce855bc | 2336 | { |
3185942a | 2337 | last_command_exit_value = EX_BADUSAGE; |
b80f6443 | 2338 | jump_to_top_level (ERREXIT); |
cce855bc | 2339 | } |
ccc6cda3 JA |
2340 | return (EXECUTION_FAILURE); |
2341 | } | |
726f6388 JA |
2342 | |
2343 | loop_level++; | |
2344 | identifier = for_command->name->word; | |
2345 | ||
2346 | list = releaser = expand_words_no_vars (for_command->map_list); | |
2347 | ||
2348 | begin_unwind_frame ("for"); | |
2349 | add_unwind_protect (dispose_words, releaser); | |
2350 | ||
ccc6cda3 | 2351 | #if 0 |
726f6388 JA |
2352 | if (lexical_scoping) |
2353 | { | |
2354 | old_value = copy_variable (find_variable (identifier)); | |
2355 | if (old_value) | |
2356 | add_unwind_protect (dispose_variable, old_value); | |
2357 | } | |
ccc6cda3 | 2358 | #endif |
726f6388 JA |
2359 | |
2360 | if (for_command->flags & CMD_IGNORE_RETURN) | |
2361 | for_command->action->flags |= CMD_IGNORE_RETURN; | |
2362 | ||
ccc6cda3 | 2363 | for (retval = EXECUTION_SUCCESS; list; list = list->next) |
726f6388 JA |
2364 | { |
2365 | QUIT; | |
b80f6443 JA |
2366 | |
2367 | line_number = for_command->line; | |
2368 | ||
2369 | /* Remember what this command looks like, for debugger. */ | |
2370 | command_string_index = 0; | |
2371 | print_for_command_head (for_command); | |
2372 | ||
2373 | if (echo_command_at_execute) | |
2374 | xtrace_print_for_command_head (for_command); | |
2375 | ||
95732b49 JA |
2376 | /* Save this command unless it's a trap command and we're not running |
2377 | a debug trap. */ | |
0628567a | 2378 | #if 0 |
95732b49 | 2379 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
2380 | #else |
2381 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
2382 | #endif | |
b80f6443 JA |
2383 | { |
2384 | FREE (the_printed_command_except_trap); | |
2385 | the_printed_command_except_trap = savestring (the_printed_command); | |
2386 | } | |
2387 | ||
2388 | retval = run_debug_trap (); | |
2389 | #if defined (DEBUGGER) | |
2390 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2391 | skip the command. */ | |
2392 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
2393 | continue; | |
2394 | #endif | |
2395 | ||
ccc6cda3 | 2396 | this_command_name = (char *)NULL; |
95732b49 | 2397 | v = bind_variable (identifier, list->word->word, 0); |
28ef6c31 | 2398 | if (readonly_p (v) || noassign_p (v)) |
ccc6cda3 | 2399 | { |
b80f6443 | 2400 | line_number = save_line_number; |
28ef6c31 | 2401 | if (readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
2402 | { |
2403 | last_command_exit_value = EXECUTION_FAILURE; | |
2404 | jump_to_top_level (FORCE_EOF); | |
2405 | } | |
2406 | else | |
2407 | { | |
b80f6443 JA |
2408 | dispose_words (releaser); |
2409 | discard_unwind_frame ("for"); | |
d166f048 | 2410 | loop_level--; |
ccc6cda3 JA |
2411 | return (EXECUTION_FAILURE); |
2412 | } | |
2413 | } | |
2414 | retval = execute_command (for_command->action); | |
726f6388 JA |
2415 | REAP (); |
2416 | QUIT; | |
2417 | ||
2418 | if (breaking) | |
2419 | { | |
ccc6cda3 | 2420 | breaking--; |
726f6388 JA |
2421 | break; |
2422 | } | |
2423 | ||
2424 | if (continuing) | |
2425 | { | |
2426 | continuing--; | |
2427 | if (continuing) | |
2428 | break; | |
2429 | } | |
726f6388 JA |
2430 | } |
2431 | ||
2432 | loop_level--; | |
b80f6443 | 2433 | line_number = save_line_number; |
726f6388 | 2434 | |
ccc6cda3 | 2435 | #if 0 |
726f6388 JA |
2436 | if (lexical_scoping) |
2437 | { | |
2438 | if (!old_value) | |
7117c2d2 | 2439 | unbind_variable (identifier); |
726f6388 JA |
2440 | else |
2441 | { | |
2442 | SHELL_VAR *new_value; | |
2443 | ||
95732b49 | 2444 | new_value = bind_variable (identifier, value_cell(old_value), 0); |
726f6388 JA |
2445 | new_value->attributes = old_value->attributes; |
2446 | dispose_variable (old_value); | |
2447 | } | |
2448 | } | |
ccc6cda3 | 2449 | #endif |
726f6388 JA |
2450 | |
2451 | dispose_words (releaser); | |
2452 | discard_unwind_frame ("for"); | |
2453 | return (retval); | |
2454 | } | |
2455 | ||
bb70624e JA |
2456 | #if defined (ARITH_FOR_COMMAND) |
2457 | /* Execute an arithmetic for command. The syntax is | |
2458 | ||
2459 | for (( init ; step ; test )) | |
2460 | do | |
2461 | body | |
2462 | done | |
2463 | ||
2464 | The execution should be exactly equivalent to | |
2465 | ||
2466 | eval \(\( init \)\) | |
2467 | while eval \(\( test \)\) ; do | |
2468 | body; | |
2469 | eval \(\( step \)\) | |
2470 | done | |
2471 | */ | |
7117c2d2 | 2472 | static intmax_t |
bb70624e JA |
2473 | eval_arith_for_expr (l, okp) |
2474 | WORD_LIST *l; | |
2475 | int *okp; | |
2476 | { | |
2477 | WORD_LIST *new; | |
7117c2d2 | 2478 | intmax_t expresult; |
b80f6443 | 2479 | int r; |
bb70624e JA |
2480 | |
2481 | new = expand_words_no_vars (l); | |
f73dda09 JA |
2482 | if (new) |
2483 | { | |
2484 | if (echo_command_at_execute) | |
2485 | xtrace_print_arith_cmd (new); | |
7117c2d2 | 2486 | this_command_name = "(("; /* )) for expression error messages */ |
b80f6443 JA |
2487 | |
2488 | command_string_index = 0; | |
2489 | print_arith_command (new); | |
95732b49 JA |
2490 | if (signal_in_progress (DEBUG_TRAP) == 0) |
2491 | { | |
2492 | FREE (the_printed_command_except_trap); | |
2493 | the_printed_command_except_trap = savestring (the_printed_command); | |
2494 | } | |
b80f6443 JA |
2495 | |
2496 | r = run_debug_trap (); | |
2497 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2498 | skip the command. */ | |
2499 | #if defined (DEBUGGER) | |
2500 | if (debugging_mode == 0 || r == EXECUTION_SUCCESS) | |
2501 | expresult = evalexp (new->word->word, okp); | |
2502 | else | |
2503 | { | |
2504 | expresult = 0; | |
2505 | if (okp) | |
2506 | *okp = 1; | |
2507 | } | |
2508 | #else | |
f73dda09 | 2509 | expresult = evalexp (new->word->word, okp); |
b80f6443 | 2510 | #endif |
f73dda09 JA |
2511 | dispose_words (new); |
2512 | } | |
2513 | else | |
2514 | { | |
2515 | expresult = 0; | |
2516 | if (okp) | |
2517 | *okp = 1; | |
2518 | } | |
bb70624e JA |
2519 | return (expresult); |
2520 | } | |
2521 | ||
2522 | static int | |
2523 | execute_arith_for_command (arith_for_command) | |
2524 | ARITH_FOR_COM *arith_for_command; | |
2525 | { | |
7117c2d2 JA |
2526 | intmax_t expresult; |
2527 | int expok, body_status, arith_lineno, save_lineno; | |
bb70624e JA |
2528 | |
2529 | body_status = EXECUTION_SUCCESS; | |
2530 | loop_level++; | |
b80f6443 | 2531 | save_lineno = line_number; |
bb70624e JA |
2532 | |
2533 | if (arith_for_command->flags & CMD_IGNORE_RETURN) | |
2534 | arith_for_command->action->flags |= CMD_IGNORE_RETURN; | |
2535 | ||
2536 | this_command_name = "(("; /* )) for expression error messages */ | |
2537 | ||
7117c2d2 JA |
2538 | /* save the starting line number of the command so we can reset |
2539 | line_number before executing each expression -- for $LINENO | |
2540 | and the DEBUG trap. */ | |
b80f6443 | 2541 | line_number = arith_lineno = arith_for_command->line; |
7117c2d2 | 2542 | if (variable_context && interactive_shell) |
b80f6443 | 2543 | line_number -= function_line_number; |
bb70624e JA |
2544 | |
2545 | /* Evaluate the initialization expression. */ | |
2546 | expresult = eval_arith_for_expr (arith_for_command->init, &expok); | |
2547 | if (expok == 0) | |
b80f6443 JA |
2548 | { |
2549 | line_number = save_lineno; | |
2550 | return (EXECUTION_FAILURE); | |
2551 | } | |
bb70624e JA |
2552 | |
2553 | while (1) | |
2554 | { | |
2555 | /* Evaluate the test expression. */ | |
7117c2d2 | 2556 | line_number = arith_lineno; |
bb70624e | 2557 | expresult = eval_arith_for_expr (arith_for_command->test, &expok); |
7117c2d2 JA |
2558 | line_number = save_lineno; |
2559 | ||
bb70624e JA |
2560 | if (expok == 0) |
2561 | { | |
2562 | body_status = EXECUTION_FAILURE; | |
2563 | break; | |
2564 | } | |
2565 | REAP (); | |
2566 | if (expresult == 0) | |
28ef6c31 | 2567 | break; |
bb70624e JA |
2568 | |
2569 | /* Execute the body of the arithmetic for command. */ | |
2570 | QUIT; | |
2571 | body_status = execute_command (arith_for_command->action); | |
2572 | QUIT; | |
2573 | ||
2574 | /* Handle any `break' or `continue' commands executed by the body. */ | |
2575 | if (breaking) | |
2576 | { | |
2577 | breaking--; | |
2578 | break; | |
2579 | } | |
2580 | ||
2581 | if (continuing) | |
2582 | { | |
2583 | continuing--; | |
2584 | if (continuing) | |
2585 | break; | |
2586 | } | |
2587 | ||
2588 | /* Evaluate the step expression. */ | |
7117c2d2 | 2589 | line_number = arith_lineno; |
bb70624e | 2590 | expresult = eval_arith_for_expr (arith_for_command->step, &expok); |
7117c2d2 JA |
2591 | line_number = save_lineno; |
2592 | ||
bb70624e JA |
2593 | if (expok == 0) |
2594 | { | |
2595 | body_status = EXECUTION_FAILURE; | |
2596 | break; | |
2597 | } | |
2598 | } | |
2599 | ||
2600 | loop_level--; | |
b80f6443 JA |
2601 | line_number = save_lineno; |
2602 | ||
bb70624e JA |
2603 | return (body_status); |
2604 | } | |
2605 | #endif | |
2606 | ||
726f6388 JA |
2607 | #if defined (SELECT_COMMAND) |
2608 | static int LINES, COLS, tabsize; | |
2609 | ||
2610 | #define RP_SPACE ") " | |
2611 | #define RP_SPACE_LEN 2 | |
2612 | ||
2613 | /* XXX - does not handle numbers > 1000000 at all. */ | |
2614 | #define NUMBER_LEN(s) \ | |
2615 | ((s < 10) ? 1 \ | |
2616 | : ((s < 100) ? 2 \ | |
2617 | : ((s < 1000) ? 3 \ | |
2618 | : ((s < 10000) ? 4 \ | |
2619 | : ((s < 100000) ? 5 \ | |
2620 | : 6))))) | |
2621 | ||
2622 | static int | |
2623 | print_index_and_element (len, ind, list) | |
2624 | int len, ind; | |
2625 | WORD_LIST *list; | |
2626 | { | |
2627 | register WORD_LIST *l; | |
2628 | register int i; | |
2629 | ||
2630 | if (list == 0) | |
2631 | return (0); | |
ccc6cda3 JA |
2632 | for (i = ind, l = list; l && --i; l = l->next) |
2633 | ; | |
726f6388 JA |
2634 | fprintf (stderr, "%*d%s%s", len, ind, RP_SPACE, l->word->word); |
2635 | return (STRLEN (l->word->word)); | |
2636 | } | |
2637 | ||
2638 | static void | |
2639 | indent (from, to) | |
2640 | int from, to; | |
2641 | { | |
2642 | while (from < to) | |
2643 | { | |
2644 | if ((to / tabsize) > (from / tabsize)) | |
2645 | { | |
2646 | putc ('\t', stderr); | |
2647 | from += tabsize - from % tabsize; | |
2648 | } | |
2649 | else | |
2650 | { | |
2651 | putc (' ', stderr); | |
2652 | from++; | |
2653 | } | |
2654 | } | |
2655 | } | |
2656 | ||
2657 | static void | |
2658 | print_select_list (list, list_len, max_elem_len, indices_len) | |
2659 | WORD_LIST *list; | |
2660 | int list_len, max_elem_len, indices_len; | |
2661 | { | |
2662 | int ind, row, elem_len, pos, cols, rows; | |
2663 | int first_column_indices_len, other_indices_len; | |
2664 | ||
2665 | if (list == 0) | |
2666 | { | |
2667 | putc ('\n', stderr); | |
2668 | return; | |
2669 | } | |
2670 | ||
ccc6cda3 | 2671 | cols = max_elem_len ? COLS / max_elem_len : 1; |
726f6388 JA |
2672 | if (cols == 0) |
2673 | cols = 1; | |
2674 | rows = list_len ? list_len / cols + (list_len % cols != 0) : 1; | |
2675 | cols = list_len ? list_len / rows + (list_len % rows != 0) : 1; | |
2676 | ||
2677 | if (rows == 1) | |
2678 | { | |
2679 | rows = cols; | |
2680 | cols = 1; | |
2681 | } | |
2682 | ||
2683 | first_column_indices_len = NUMBER_LEN (rows); | |
2684 | other_indices_len = indices_len; | |
2685 | ||
2686 | for (row = 0; row < rows; row++) | |
2687 | { | |
2688 | ind = row; | |
2689 | pos = 0; | |
2690 | while (1) | |
2691 | { | |
2692 | indices_len = (pos == 0) ? first_column_indices_len : other_indices_len; | |
2693 | elem_len = print_index_and_element (indices_len, ind + 1, list); | |
2694 | elem_len += indices_len + RP_SPACE_LEN; | |
2695 | ind += rows; | |
2696 | if (ind >= list_len) | |
2697 | break; | |
2698 | indent (pos + elem_len, pos + max_elem_len); | |
2699 | pos += max_elem_len; | |
2700 | } | |
2701 | putc ('\n', stderr); | |
2702 | } | |
2703 | } | |
2704 | ||
2705 | /* Print the elements of LIST, one per line, preceded by an index from 1 to | |
2706 | LIST_LEN. Then display PROMPT and wait for the user to enter a number. | |
2707 | If the number is between 1 and LIST_LEN, return that selection. If EOF | |
e8ce775d JA |
2708 | is read, return a null string. If a blank line is entered, or an invalid |
2709 | number is entered, the loop is executed again. */ | |
726f6388 | 2710 | static char * |
7117c2d2 | 2711 | select_query (list, list_len, prompt, print_menu) |
726f6388 JA |
2712 | WORD_LIST *list; |
2713 | int list_len; | |
2714 | char *prompt; | |
7117c2d2 | 2715 | int print_menu; |
726f6388 | 2716 | { |
e8ce775d | 2717 | int max_elem_len, indices_len, len; |
7117c2d2 | 2718 | intmax_t reply; |
726f6388 JA |
2719 | WORD_LIST *l; |
2720 | char *repl_string, *t; | |
2721 | ||
2722 | t = get_string_value ("LINES"); | |
2723 | LINES = (t && *t) ? atoi (t) : 24; | |
2724 | t = get_string_value ("COLUMNS"); | |
2725 | COLS = (t && *t) ? atoi (t) : 80; | |
2726 | ||
2727 | #if 0 | |
2728 | t = get_string_value ("TABSIZE"); | |
2729 | tabsize = (t && *t) ? atoi (t) : 8; | |
2730 | if (tabsize <= 0) | |
2731 | tabsize = 8; | |
2732 | #else | |
2733 | tabsize = 8; | |
2734 | #endif | |
2735 | ||
2736 | max_elem_len = 0; | |
2737 | for (l = list; l; l = l->next) | |
2738 | { | |
2739 | len = STRLEN (l->word->word); | |
2740 | if (len > max_elem_len) | |
cce855bc | 2741 | max_elem_len = len; |
726f6388 JA |
2742 | } |
2743 | indices_len = NUMBER_LEN (list_len); | |
2744 | max_elem_len += indices_len + RP_SPACE_LEN + 2; | |
2745 | ||
2746 | while (1) | |
2747 | { | |
7117c2d2 JA |
2748 | if (print_menu) |
2749 | print_select_list (list, list_len, max_elem_len, indices_len); | |
ccc6cda3 JA |
2750 | fprintf (stderr, "%s", prompt); |
2751 | fflush (stderr); | |
726f6388 JA |
2752 | QUIT; |
2753 | ||
2754 | if (read_builtin ((WORD_LIST *)NULL) == EXECUTION_FAILURE) | |
2755 | { | |
2756 | putchar ('\n'); | |
2757 | return ((char *)NULL); | |
2758 | } | |
2759 | repl_string = get_string_value ("REPLY"); | |
2760 | if (*repl_string == 0) | |
7117c2d2 JA |
2761 | { |
2762 | print_menu = 1; | |
2763 | continue; | |
2764 | } | |
e8ce775d | 2765 | if (legal_number (repl_string, &reply) == 0) |
cce855bc | 2766 | return ""; |
726f6388 JA |
2767 | if (reply < 1 || reply > list_len) |
2768 | return ""; | |
2769 | ||
ccc6cda3 JA |
2770 | for (l = list; l && --reply; l = l->next) |
2771 | ; | |
726f6388 JA |
2772 | return (l->word->word); |
2773 | } | |
2774 | } | |
2775 | ||
2776 | /* Execute a SELECT command. The syntax is: | |
2777 | SELECT word IN list DO command_list DONE | |
2778 | Only `break' or `return' in command_list will terminate | |
2779 | the command. */ | |
ccc6cda3 | 2780 | static int |
726f6388 JA |
2781 | execute_select_command (select_command) |
2782 | SELECT_COM *select_command; | |
2783 | { | |
2784 | WORD_LIST *releaser, *list; | |
ccc6cda3 | 2785 | SHELL_VAR *v; |
726f6388 | 2786 | char *identifier, *ps3_prompt, *selection; |
b80f6443 | 2787 | int retval, list_len, show_menu, save_line_number; |
7117c2d2 | 2788 | |
726f6388 JA |
2789 | if (check_identifier (select_command->name, 1) == 0) |
2790 | return (EXECUTION_FAILURE); | |
2791 | ||
b80f6443 JA |
2792 | save_line_number = line_number; |
2793 | line_number = select_command->line; | |
2794 | ||
2795 | command_string_index = 0; | |
2796 | print_select_command_head (select_command); | |
2797 | ||
2798 | if (echo_command_at_execute) | |
2799 | xtrace_print_select_command_head (select_command); | |
2800 | ||
0628567a | 2801 | #if 0 |
95732b49 | 2802 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
2803 | #else |
2804 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
2805 | #endif | |
95732b49 JA |
2806 | { |
2807 | FREE (the_printed_command_except_trap); | |
2808 | the_printed_command_except_trap = savestring (the_printed_command); | |
2809 | } | |
b80f6443 JA |
2810 | |
2811 | retval = run_debug_trap (); | |
2812 | #if defined (DEBUGGER) | |
2813 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2814 | skip the command. */ | |
2815 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
2816 | return (EXECUTION_SUCCESS); | |
2817 | #endif | |
2818 | ||
726f6388 JA |
2819 | loop_level++; |
2820 | identifier = select_command->name->word; | |
2821 | ||
2822 | /* command and arithmetic substitution, parameter and variable expansion, | |
2823 | word splitting, pathname expansion, and quote removal. */ | |
2824 | list = releaser = expand_words_no_vars (select_command->map_list); | |
2825 | list_len = list_length (list); | |
2826 | if (list == 0 || list_len == 0) | |
2827 | { | |
2828 | if (list) | |
2829 | dispose_words (list); | |
b80f6443 | 2830 | line_number = save_line_number; |
726f6388 JA |
2831 | return (EXECUTION_SUCCESS); |
2832 | } | |
2833 | ||
2834 | begin_unwind_frame ("select"); | |
2835 | add_unwind_protect (dispose_words, releaser); | |
2836 | ||
726f6388 JA |
2837 | if (select_command->flags & CMD_IGNORE_RETURN) |
2838 | select_command->action->flags |= CMD_IGNORE_RETURN; | |
2839 | ||
ccc6cda3 | 2840 | retval = EXECUTION_SUCCESS; |
7117c2d2 | 2841 | show_menu = 1; |
ccc6cda3 | 2842 | |
726f6388 JA |
2843 | while (1) |
2844 | { | |
b80f6443 | 2845 | line_number = select_command->line; |
726f6388 | 2846 | ps3_prompt = get_string_value ("PS3"); |
ccc6cda3 | 2847 | if (ps3_prompt == 0) |
726f6388 JA |
2848 | ps3_prompt = "#? "; |
2849 | ||
2850 | QUIT; | |
7117c2d2 | 2851 | selection = select_query (list, list_len, ps3_prompt, show_menu); |
726f6388 JA |
2852 | QUIT; |
2853 | if (selection == 0) | |
7117c2d2 JA |
2854 | { |
2855 | /* select_query returns EXECUTION_FAILURE if the read builtin | |
2856 | fails, so we want to return failure in this case. */ | |
2857 | retval = EXECUTION_FAILURE; | |
2858 | break; | |
2859 | } | |
ccc6cda3 | 2860 | |
95732b49 | 2861 | v = bind_variable (identifier, selection, 0); |
28ef6c31 | 2862 | if (readonly_p (v) || noassign_p (v)) |
ccc6cda3 | 2863 | { |
28ef6c31 | 2864 | if (readonly_p (v) && interactive_shell == 0 && posixly_correct) |
ccc6cda3 JA |
2865 | { |
2866 | last_command_exit_value = EXECUTION_FAILURE; | |
2867 | jump_to_top_level (FORCE_EOF); | |
2868 | } | |
2869 | else | |
2870 | { | |
b80f6443 JA |
2871 | dispose_words (releaser); |
2872 | discard_unwind_frame ("select"); | |
2873 | loop_level--; | |
2874 | line_number = save_line_number; | |
ccc6cda3 JA |
2875 | return (EXECUTION_FAILURE); |
2876 | } | |
2877 | } | |
726f6388 | 2878 | |
f73dda09 | 2879 | retval = execute_command (select_command->action); |
726f6388 JA |
2880 | |
2881 | REAP (); | |
2882 | QUIT; | |
2883 | ||
2884 | if (breaking) | |
2885 | { | |
2886 | breaking--; | |
2887 | break; | |
2888 | } | |
bb70624e JA |
2889 | |
2890 | if (continuing) | |
2891 | { | |
2892 | continuing--; | |
2893 | if (continuing) | |
2894 | break; | |
2895 | } | |
7117c2d2 JA |
2896 | |
2897 | #if defined (KSH_COMPATIBLE_SELECT) | |
2898 | show_menu = 0; | |
2899 | selection = get_string_value ("REPLY"); | |
2900 | if (selection && *selection == '\0') | |
2901 | show_menu = 1; | |
2902 | #endif | |
726f6388 JA |
2903 | } |
2904 | ||
2905 | loop_level--; | |
b80f6443 | 2906 | line_number = save_line_number; |
726f6388 | 2907 | |
b80f6443 JA |
2908 | dispose_words (releaser); |
2909 | discard_unwind_frame ("select"); | |
726f6388 JA |
2910 | return (retval); |
2911 | } | |
2912 | #endif /* SELECT_COMMAND */ | |
2913 | ||
2914 | /* Execute a CASE command. The syntax is: CASE word_desc IN pattern_list ESAC. | |
2915 | The pattern_list is a linked list of pattern clauses; each clause contains | |
2916 | some patterns to compare word_desc against, and an associated command to | |
2917 | execute. */ | |
ccc6cda3 | 2918 | static int |
726f6388 JA |
2919 | execute_case_command (case_command) |
2920 | CASE_COM *case_command; | |
2921 | { | |
2922 | register WORD_LIST *list; | |
ccc6cda3 | 2923 | WORD_LIST *wlist, *es; |
726f6388 | 2924 | PATTERN_LIST *clauses; |
ccc6cda3 | 2925 | char *word, *pattern; |
b80f6443 JA |
2926 | int retval, match, ignore_return, save_line_number; |
2927 | ||
2928 | save_line_number = line_number; | |
2929 | line_number = case_command->line; | |
2930 | ||
2931 | command_string_index = 0; | |
2932 | print_case_command_head (case_command); | |
2933 | ||
2934 | if (echo_command_at_execute) | |
2935 | xtrace_print_case_command_head (case_command); | |
2936 | ||
0628567a JA |
2937 | #if 0 |
2938 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) | |
2939 | #else | |
2940 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
2941 | #endif | |
b80f6443 JA |
2942 | { |
2943 | FREE (the_printed_command_except_trap); | |
2944 | the_printed_command_except_trap = savestring (the_printed_command); | |
2945 | } | |
2946 | ||
2947 | retval = run_debug_trap(); | |
2948 | #if defined (DEBUGGER) | |
2949 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2950 | skip the command. */ | |
2951 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
2952 | { | |
2953 | line_number = save_line_number; | |
2954 | return (EXECUTION_SUCCESS); | |
2955 | } | |
2956 | #endif | |
726f6388 | 2957 | |
28ef6c31 | 2958 | wlist = expand_word_unsplit (case_command->word, 0); |
ccc6cda3 JA |
2959 | word = wlist ? string_list (wlist) : savestring (""); |
2960 | dispose_words (wlist); | |
2961 | ||
726f6388 | 2962 | retval = EXECUTION_SUCCESS; |
ccc6cda3 | 2963 | ignore_return = case_command->flags & CMD_IGNORE_RETURN; |
726f6388 JA |
2964 | |
2965 | begin_unwind_frame ("case"); | |
726f6388 JA |
2966 | add_unwind_protect ((Function *)xfree, word); |
2967 | ||
ccc6cda3 JA |
2968 | #define EXIT_CASE() goto exit_case_command |
2969 | ||
2970 | for (clauses = case_command->clauses; clauses; clauses = clauses->next) | |
726f6388 JA |
2971 | { |
2972 | QUIT; | |
ccc6cda3 | 2973 | for (list = clauses->patterns; list; list = list->next) |
726f6388 | 2974 | { |
726f6388 JA |
2975 | es = expand_word_leave_quoted (list->word, 0); |
2976 | ||
2977 | if (es && es->word && es->word->word && *(es->word->word)) | |
cce855bc | 2978 | pattern = quote_string_for_globbing (es->word->word, QGLOB_CVTNULL); |
726f6388 | 2979 | else |
ccc6cda3 | 2980 | { |
f73dda09 | 2981 | pattern = (char *)xmalloc (1); |
ccc6cda3 JA |
2982 | pattern[0] = '\0'; |
2983 | } | |
726f6388 JA |
2984 | |
2985 | /* Since the pattern does not undergo quote removal (as per | |
f73dda09 | 2986 | Posix.2, section 3.9.4.3), the strmatch () call must be able |
726f6388 | 2987 | to recognize backslashes as escape characters. */ |
95732b49 | 2988 | match = strmatch (pattern, word, FNMATCH_EXTFLAG|FNMATCH_IGNCASE) != FNM_NOMATCH; |
726f6388 JA |
2989 | free (pattern); |
2990 | ||
2991 | dispose_words (es); | |
2992 | ||
2993 | if (match) | |
2994 | { | |
3185942a JA |
2995 | do |
2996 | { | |
2997 | if (clauses->action && ignore_return) | |
2998 | clauses->action->flags |= CMD_IGNORE_RETURN; | |
2999 | retval = execute_command (clauses->action); | |
3000 | } | |
3001 | while ((clauses->flags & CASEPAT_FALLTHROUGH) && (clauses = clauses->next)); | |
89a92869 | 3002 | if (clauses == 0 || (clauses->flags & CASEPAT_TESTNEXT) == 0) |
3185942a JA |
3003 | EXIT_CASE (); |
3004 | else | |
3005 | break; | |
726f6388 JA |
3006 | } |
3007 | ||
726f6388 JA |
3008 | QUIT; |
3009 | } | |
726f6388 JA |
3010 | } |
3011 | ||
ccc6cda3 JA |
3012 | exit_case_command: |
3013 | free (word); | |
726f6388 | 3014 | discard_unwind_frame ("case"); |
b80f6443 | 3015 | line_number = save_line_number; |
726f6388 JA |
3016 | return (retval); |
3017 | } | |
3018 | ||
3019 | #define CMD_WHILE 0 | |
3020 | #define CMD_UNTIL 1 | |
3021 | ||
3022 | /* The WHILE command. Syntax: WHILE test DO action; DONE. | |
3023 | Repeatedly execute action while executing test produces | |
3024 | EXECUTION_SUCCESS. */ | |
ccc6cda3 | 3025 | static int |
726f6388 JA |
3026 | execute_while_command (while_command) |
3027 | WHILE_COM *while_command; | |
3028 | { | |
3029 | return (execute_while_or_until (while_command, CMD_WHILE)); | |
3030 | } | |
3031 | ||
3032 | /* UNTIL is just like WHILE except that the test result is negated. */ | |
ccc6cda3 | 3033 | static int |
726f6388 JA |
3034 | execute_until_command (while_command) |
3035 | WHILE_COM *while_command; | |
3036 | { | |
3037 | return (execute_while_or_until (while_command, CMD_UNTIL)); | |
3038 | } | |
3039 | ||
3040 | /* The body for both while and until. The only difference between the | |
3041 | two is that the test value is treated differently. TYPE is | |
3042 | CMD_WHILE or CMD_UNTIL. The return value for both commands should | |
3043 | be EXECUTION_SUCCESS if no commands in the body are executed, and | |
3044 | the status of the last command executed in the body otherwise. */ | |
ccc6cda3 | 3045 | static int |
726f6388 JA |
3046 | execute_while_or_until (while_command, type) |
3047 | WHILE_COM *while_command; | |
3048 | int type; | |
3049 | { | |
3050 | int return_value, body_status; | |
3051 | ||
3052 | body_status = EXECUTION_SUCCESS; | |
3053 | loop_level++; | |
3054 | ||
3055 | while_command->test->flags |= CMD_IGNORE_RETURN; | |
3056 | if (while_command->flags & CMD_IGNORE_RETURN) | |
3057 | while_command->action->flags |= CMD_IGNORE_RETURN; | |
3058 | ||
3059 | while (1) | |
3060 | { | |
3061 | return_value = execute_command (while_command->test); | |
3062 | REAP (); | |
3063 | ||
f73dda09 JA |
3064 | /* Need to handle `break' in the test when we would break out of the |
3065 | loop. The job control code will set `breaking' to loop_level | |
3066 | when a job in a loop is stopped with SIGTSTP. If the stopped job | |
3067 | is in the loop test, `breaking' will not be reset unless we do | |
3068 | this, and the shell will cease to execute commands. */ | |
726f6388 | 3069 | if (type == CMD_WHILE && return_value != EXECUTION_SUCCESS) |
f73dda09 JA |
3070 | { |
3071 | if (breaking) | |
3072 | breaking--; | |
3073 | break; | |
3074 | } | |
726f6388 | 3075 | if (type == CMD_UNTIL && return_value == EXECUTION_SUCCESS) |
f73dda09 JA |
3076 | { |
3077 | if (breaking) | |
3078 | breaking--; | |
3079 | break; | |
3080 | } | |
726f6388 JA |
3081 | |
3082 | QUIT; | |
3083 | body_status = execute_command (while_command->action); | |
3084 | QUIT; | |
3085 | ||
3086 | if (breaking) | |
3087 | { | |
3088 | breaking--; | |
3089 | break; | |
3090 | } | |
3091 | ||
3092 | if (continuing) | |
3093 | { | |
3094 | continuing--; | |
3095 | if (continuing) | |
3096 | break; | |
3097 | } | |
3098 | } | |
3099 | loop_level--; | |
3100 | ||
3101 | return (body_status); | |
3102 | } | |
3103 | ||
3104 | /* IF test THEN command [ELSE command]. | |
3105 | IF also allows ELIF in the place of ELSE IF, but | |
3106 | the parser makes *that* stupidity transparent. */ | |
ccc6cda3 | 3107 | static int |
726f6388 JA |
3108 | execute_if_command (if_command) |
3109 | IF_COM *if_command; | |
3110 | { | |
b80f6443 | 3111 | int return_value, save_line_number; |
726f6388 | 3112 | |
b80f6443 | 3113 | save_line_number = line_number; |
726f6388 JA |
3114 | if_command->test->flags |= CMD_IGNORE_RETURN; |
3115 | return_value = execute_command (if_command->test); | |
b80f6443 | 3116 | line_number = save_line_number; |
726f6388 JA |
3117 | |
3118 | if (return_value == EXECUTION_SUCCESS) | |
3119 | { | |
3120 | QUIT; | |
ccc6cda3 | 3121 | |
726f6388 | 3122 | if (if_command->true_case && (if_command->flags & CMD_IGNORE_RETURN)) |
ccc6cda3 JA |
3123 | if_command->true_case->flags |= CMD_IGNORE_RETURN; |
3124 | ||
726f6388 JA |
3125 | return (execute_command (if_command->true_case)); |
3126 | } | |
3127 | else | |
3128 | { | |
3129 | QUIT; | |
3130 | ||
3131 | if (if_command->false_case && (if_command->flags & CMD_IGNORE_RETURN)) | |
3132 | if_command->false_case->flags |= CMD_IGNORE_RETURN; | |
3133 | ||
3134 | return (execute_command (if_command->false_case)); | |
3135 | } | |
3136 | } | |
3137 | ||
cce855bc JA |
3138 | #if defined (DPAREN_ARITHMETIC) |
3139 | static int | |
3140 | execute_arith_command (arith_command) | |
3141 | ARITH_COM *arith_command; | |
3142 | { | |
b80f6443 | 3143 | int expok, save_line_number, retval; |
7117c2d2 | 3144 | intmax_t expresult; |
f73dda09 | 3145 | WORD_LIST *new; |
0628567a | 3146 | char *exp; |
cce855bc | 3147 | |
f73dda09 | 3148 | expresult = 0; |
cce855bc | 3149 | |
b80f6443 | 3150 | save_line_number = line_number; |
b72432fd | 3151 | this_command_name = "(("; /* )) */ |
b80f6443 | 3152 | line_number = arith_command->line; |
cce855bc | 3153 | /* If we're in a function, update the line number information. */ |
7117c2d2 | 3154 | if (variable_context && interactive_shell) |
b80f6443 JA |
3155 | line_number -= function_line_number; |
3156 | ||
3157 | command_string_index = 0; | |
3158 | print_arith_command (arith_command->exp); | |
95732b49 JA |
3159 | |
3160 | if (signal_in_progress (DEBUG_TRAP) == 0) | |
3161 | { | |
3162 | FREE (the_printed_command_except_trap); | |
3163 | the_printed_command_except_trap = savestring (the_printed_command); | |
3164 | } | |
cce855bc | 3165 | |
7117c2d2 JA |
3166 | /* Run the debug trap before each arithmetic command, but do it after we |
3167 | update the line number information and before we expand the various | |
3168 | words in the expression. */ | |
b80f6443 JA |
3169 | retval = run_debug_trap (); |
3170 | #if defined (DEBUGGER) | |
3171 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3172 | skip the command. */ | |
3173 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3174 | { | |
3175 | line_number = save_line_number; | |
3176 | return (EXECUTION_SUCCESS); | |
3177 | } | |
3178 | #endif | |
7117c2d2 | 3179 | |
b80f6443 | 3180 | new = expand_words_no_vars (arith_command->exp); |
cce855bc JA |
3181 | |
3182 | /* If we're tracing, make a new word list with `((' at the front and `))' | |
3183 | at the back and print it. */ | |
3184 | if (echo_command_at_execute) | |
3185 | xtrace_print_arith_cmd (new); | |
3186 | ||
b80f6443 JA |
3187 | if (new) |
3188 | { | |
0628567a JA |
3189 | exp = new->next ? string_list (new) : new->word->word; |
3190 | expresult = evalexp (exp, &expok); | |
b80f6443 | 3191 | line_number = save_line_number; |
0628567a JA |
3192 | if (exp != new->word->word) |
3193 | free (exp); | |
b80f6443 JA |
3194 | dispose_words (new); |
3195 | } | |
3196 | else | |
3197 | { | |
3198 | expresult = 0; | |
3199 | expok = 1; | |
3200 | } | |
cce855bc JA |
3201 | |
3202 | if (expok == 0) | |
3203 | return (EXECUTION_FAILURE); | |
3204 | ||
f73dda09 | 3205 | return (expresult == 0 ? EXECUTION_FAILURE : EXECUTION_SUCCESS); |
cce855bc JA |
3206 | } |
3207 | #endif /* DPAREN_ARITHMETIC */ | |
3208 | ||
3209 | #if defined (COND_COMMAND) | |
3210 | ||
3185942a | 3211 | static char * const nullstr = ""; |
cce855bc JA |
3212 | |
3213 | static int | |
3214 | execute_cond_node (cond) | |
3215 | COND_COM *cond; | |
3216 | { | |
0001803f | 3217 | int result, invert, patmatch, rmatch, mflags, ignore; |
f73dda09 | 3218 | char *arg1, *arg2; |
cce855bc JA |
3219 | |
3220 | invert = (cond->flags & CMD_INVERT_RETURN); | |
0001803f CR |
3221 | ignore = (cond->flags & CMD_IGNORE_RETURN); |
3222 | if (ignore) | |
3223 | { | |
3224 | if (cond->left) | |
3225 | cond->left->flags |= CMD_IGNORE_RETURN; | |
3226 | if (cond->right) | |
3227 | cond->right->flags |= CMD_IGNORE_RETURN; | |
3228 | } | |
3229 | ||
cce855bc JA |
3230 | if (cond->type == COND_EXPR) |
3231 | result = execute_cond_node (cond->left); | |
3232 | else if (cond->type == COND_OR) | |
3233 | { | |
3234 | result = execute_cond_node (cond->left); | |
3235 | if (result != EXECUTION_SUCCESS) | |
3236 | result = execute_cond_node (cond->right); | |
3237 | } | |
3238 | else if (cond->type == COND_AND) | |
3239 | { | |
3240 | result = execute_cond_node (cond->left); | |
3241 | if (result == EXECUTION_SUCCESS) | |
3242 | result = execute_cond_node (cond->right); | |
3243 | } | |
3244 | else if (cond->type == COND_UNARY) | |
3245 | { | |
0001803f CR |
3246 | if (ignore) |
3247 | comsub_ignore_return++; | |
cce855bc | 3248 | arg1 = cond_expand_word (cond->left->op, 0); |
0001803f CR |
3249 | if (ignore) |
3250 | comsub_ignore_return--; | |
cce855bc JA |
3251 | if (arg1 == 0) |
3252 | arg1 = nullstr; | |
3253 | if (echo_command_at_execute) | |
3254 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, (char *)NULL); | |
3255 | result = unary_test (cond->op->word, arg1) ? EXECUTION_SUCCESS : EXECUTION_FAILURE; | |
3256 | if (arg1 != nullstr) | |
3257 | free (arg1); | |
3258 | } | |
3259 | else if (cond->type == COND_BINARY) | |
3260 | { | |
0628567a | 3261 | rmatch = 0; |
b72432fd JA |
3262 | patmatch = ((cond->op->word[1] == '=') && (cond->op->word[2] == '\0') && |
3263 | (cond->op->word[0] == '!' || cond->op->word[0] == '=') || | |
3264 | (cond->op->word[0] == '=' && cond->op->word[1] == '\0')); | |
b80f6443 JA |
3265 | #if defined (COND_REGEXP) |
3266 | rmatch = (cond->op->word[0] == '=' && cond->op->word[1] == '~' && | |
3267 | cond->op->word[2] == '\0'); | |
3268 | #endif | |
cce855bc | 3269 | |
0001803f CR |
3270 | if (ignore) |
3271 | comsub_ignore_return++; | |
cce855bc | 3272 | arg1 = cond_expand_word (cond->left->op, 0); |
0001803f CR |
3273 | if (ignore) |
3274 | comsub_ignore_return--; | |
cce855bc JA |
3275 | if (arg1 == 0) |
3276 | arg1 = nullstr; | |
0001803f CR |
3277 | if (ignore) |
3278 | comsub_ignore_return++; | |
f1be666c JA |
3279 | arg2 = cond_expand_word (cond->right->op, |
3280 | (rmatch && shell_compatibility_level > 31) ? 2 : (patmatch ? 1 : 0)); | |
0001803f CR |
3281 | if (ignore) |
3282 | comsub_ignore_return--; | |
cce855bc JA |
3283 | if (arg2 == 0) |
3284 | arg2 = nullstr; | |
3285 | ||
3286 | if (echo_command_at_execute) | |
3287 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, arg2); | |
3288 | ||
b80f6443 JA |
3289 | #if defined (COND_REGEXP) |
3290 | if (rmatch) | |
3291 | { | |
3292 | mflags = SHMAT_PWARN; | |
3293 | #if defined (ARRAY_VARS) | |
3294 | mflags |= SHMAT_SUBEXP; | |
3295 | #endif | |
3296 | ||
3297 | result = sh_regmatch (arg1, arg2, mflags); | |
3298 | } | |
3299 | else | |
3300 | #endif /* COND_REGEXP */ | |
95732b49 JA |
3301 | { |
3302 | int oe; | |
3303 | oe = extended_glob; | |
3304 | extended_glob = 1; | |
0001803f | 3305 | result = binary_test (cond->op->word, arg1, arg2, TEST_PATMATCH|TEST_ARITHEXP|TEST_LOCALE) |
95732b49 JA |
3306 | ? EXECUTION_SUCCESS |
3307 | : EXECUTION_FAILURE; | |
3308 | extended_glob = oe; | |
3309 | } | |
cce855bc JA |
3310 | if (arg1 != nullstr) |
3311 | free (arg1); | |
3312 | if (arg2 != nullstr) | |
3313 | free (arg2); | |
3314 | } | |
3315 | else | |
3316 | { | |
b72432fd | 3317 | command_error ("execute_cond_node", CMDERR_BADTYPE, cond->type, 0); |
cce855bc JA |
3318 | jump_to_top_level (DISCARD); |
3319 | result = EXECUTION_FAILURE; | |
3320 | } | |
3321 | ||
3322 | if (invert) | |
3323 | result = (result == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : EXECUTION_SUCCESS; | |
3324 | ||
3325 | return result; | |
3326 | } | |
3327 | ||
3328 | static int | |
3329 | execute_cond_command (cond_command) | |
3330 | COND_COM *cond_command; | |
3331 | { | |
b80f6443 | 3332 | int retval, save_line_number; |
cce855bc | 3333 | |
b80f6443 JA |
3334 | retval = EXECUTION_SUCCESS; |
3335 | save_line_number = line_number; | |
cce855bc JA |
3336 | |
3337 | this_command_name = "[["; | |
b80f6443 | 3338 | line_number = cond_command->line; |
cce855bc | 3339 | /* If we're in a function, update the line number information. */ |
7117c2d2 | 3340 | if (variable_context && interactive_shell) |
b80f6443 | 3341 | line_number -= function_line_number; |
b80f6443 JA |
3342 | command_string_index = 0; |
3343 | print_cond_command (cond_command); | |
95732b49 JA |
3344 | |
3345 | if (signal_in_progress (DEBUG_TRAP) == 0) | |
3346 | { | |
3347 | FREE (the_printed_command_except_trap); | |
3348 | the_printed_command_except_trap = savestring (the_printed_command); | |
3349 | } | |
cce855bc | 3350 | |
7117c2d2 JA |
3351 | /* Run the debug trap before each conditional command, but do it after we |
3352 | update the line number information. */ | |
b80f6443 JA |
3353 | retval = run_debug_trap (); |
3354 | #if defined (DEBUGGER) | |
3355 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3356 | skip the command. */ | |
3357 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3358 | { | |
3359 | line_number = save_line_number; | |
3360 | return (EXECUTION_SUCCESS); | |
3361 | } | |
3362 | #endif | |
7117c2d2 | 3363 | |
cce855bc JA |
3364 | #if 0 |
3365 | debug_print_cond_command (cond_command); | |
3366 | #endif | |
b80f6443 JA |
3367 | |
3368 | last_command_exit_value = retval = execute_cond_node (cond_command); | |
3369 | line_number = save_line_number; | |
3370 | return (retval); | |
cce855bc JA |
3371 | } |
3372 | #endif /* COND_COMMAND */ | |
3373 | ||
726f6388 JA |
3374 | static void |
3375 | bind_lastarg (arg) | |
3376 | char *arg; | |
3377 | { | |
3378 | SHELL_VAR *var; | |
3379 | ||
ccc6cda3 | 3380 | if (arg == 0) |
726f6388 | 3381 | arg = ""; |
95732b49 | 3382 | var = bind_variable ("_", arg, 0); |
bb70624e | 3383 | VUNSETATTR (var, att_exported); |
726f6388 JA |
3384 | } |
3385 | ||
ccc6cda3 JA |
3386 | /* Execute a null command. Fork a subshell if the command uses pipes or is |
3387 | to be run asynchronously. This handles all the side effects that are | |
3388 | supposed to take place. */ | |
3389 | static int | |
95732b49 | 3390 | execute_null_command (redirects, pipe_in, pipe_out, async) |
ccc6cda3 | 3391 | REDIRECT *redirects; |
bb70624e | 3392 | int pipe_in, pipe_out, async; |
ccc6cda3 | 3393 | { |
b80f6443 | 3394 | int r; |
0001803f CR |
3395 | int forcefork; |
3396 | REDIRECT *rd; | |
b80f6443 | 3397 | |
0001803f CR |
3398 | for (forcefork = 0, rd = redirects; rd; rd = rd->next) |
3399 | forcefork += rd->rflags & REDIR_VARASSIGN; | |
3400 | ||
3401 | if (forcefork || pipe_in != NO_PIPE || pipe_out != NO_PIPE || async) | |
ccc6cda3 JA |
3402 | { |
3403 | /* We have a null command, but we really want a subshell to take | |
3404 | care of it. Just fork, do piping and redirections, and exit. */ | |
3405 | if (make_child ((char *)NULL, async) == 0) | |
3406 | { | |
3407 | /* Cancel traps, in trap.c. */ | |
3408 | restore_original_signals (); /* XXX */ | |
3409 | ||
3410 | do_piping (pipe_in, pipe_out); | |
3411 | ||
3185942a JA |
3412 | #if defined (COPROCESS_SUPPORT) |
3413 | coproc_closeall (); | |
3414 | #endif | |
3415 | ||
3416 | subshell_environment = 0; | |
0628567a JA |
3417 | if (async) |
3418 | subshell_environment |= SUBSHELL_ASYNC; | |
3419 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
3420 | subshell_environment |= SUBSHELL_PIPE; | |
ccc6cda3 | 3421 | |
b80f6443 | 3422 | if (do_redirections (redirects, RX_ACTIVE) == 0) |
ccc6cda3 JA |
3423 | exit (EXECUTION_SUCCESS); |
3424 | else | |
3425 | exit (EXECUTION_FAILURE); | |
3426 | } | |
3427 | else | |
3428 | { | |
3429 | close_pipes (pipe_in, pipe_out); | |
3430 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
3431 | unlink_fifo_list (); | |
3432 | #endif | |
3433 | return (EXECUTION_SUCCESS); | |
3434 | } | |
3435 | } | |
3436 | else | |
3437 | { | |
3438 | /* Even if there aren't any command names, pretend to do the | |
3439 | redirections that are specified. The user expects the side | |
3440 | effects to take place. If the redirections fail, then return | |
3441 | failure. Otherwise, if a command substitution took place while | |
3442 | expanding the command or a redirection, return the value of that | |
3443 | substitution. Otherwise, return EXECUTION_SUCCESS. */ | |
3444 | ||
b80f6443 JA |
3445 | r = do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE); |
3446 | cleanup_redirects (redirection_undo_list); | |
3447 | redirection_undo_list = (REDIRECT *)NULL; | |
3448 | ||
3449 | if (r != 0) | |
ccc6cda3 | 3450 | return (EXECUTION_FAILURE); |
95732b49 | 3451 | else if (last_command_subst_pid != NO_PID) |
ccc6cda3 JA |
3452 | return (last_command_exit_value); |
3453 | else | |
3454 | return (EXECUTION_SUCCESS); | |
3455 | } | |
3456 | } | |
3457 | ||
3458 | /* This is a hack to suppress word splitting for assignment statements | |
3459 | given as arguments to builtins with the ASSIGNMENT_BUILTIN flag set. */ | |
3460 | static void | |
3461 | fix_assignment_words (words) | |
3462 | WORD_LIST *words; | |
3463 | { | |
3464 | WORD_LIST *w; | |
3465 | struct builtin *b; | |
3185942a | 3466 | int assoc; |
ccc6cda3 JA |
3467 | |
3468 | if (words == 0) | |
3469 | return; | |
3470 | ||
7117c2d2 | 3471 | b = 0; |
3185942a | 3472 | assoc = 0; |
ccc6cda3 JA |
3473 | |
3474 | for (w = words; w; w = w->next) | |
3475 | if (w->word->flags & W_ASSIGNMENT) | |
7117c2d2 JA |
3476 | { |
3477 | if (b == 0) | |
3478 | { | |
3479 | b = builtin_address_internal (words->word->word, 0); | |
3480 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) | |
3481 | return; | |
95732b49 JA |
3482 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) |
3483 | words->word->flags |= W_ASSNBLTIN; | |
7117c2d2 | 3484 | } |
95732b49 | 3485 | w->word->flags |= (W_NOSPLIT|W_NOGLOB|W_TILDEEXP|W_ASSIGNARG); |
3185942a JA |
3486 | #if defined (ARRAY_VARS) |
3487 | if (assoc) | |
3488 | w->word->flags |= W_ASSIGNASSOC; | |
3489 | #endif | |
7117c2d2 | 3490 | } |
3185942a JA |
3491 | #if defined (ARRAY_VARS) |
3492 | /* Note that we saw an associative array option to a builtin that takes | |
3493 | assignment statements. This is a bit of a kludge. */ | |
3494 | else if (w->word->word[0] == '-' && strchr (w->word->word, 'A')) | |
3495 | { | |
3496 | if (b == 0) | |
3497 | { | |
3498 | b = builtin_address_internal (words->word->word, 0); | |
3499 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) | |
3500 | return; | |
3501 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) | |
3502 | words->word->flags |= W_ASSNBLTIN; | |
3503 | } | |
3504 | if (words->word->flags & W_ASSNBLTIN) | |
3505 | assoc = 1; | |
3506 | } | |
3507 | #endif | |
3508 | } | |
3509 | ||
3510 | /* Return 1 if the file found by searching $PATH for PATHNAME, defaulting | |
3511 | to PATHNAME, is a directory. Used by the autocd code below. */ | |
3512 | static int | |
3513 | is_dirname (pathname) | |
3514 | char *pathname; | |
3515 | { | |
3516 | char *temp; | |
3517 | temp = search_for_command (pathname); | |
3518 | return (temp ? file_isdir (temp) : file_isdir (pathname)); | |
ccc6cda3 JA |
3519 | } |
3520 | ||
726f6388 JA |
3521 | /* The meaty part of all the executions. We have to start hacking the |
3522 | real execution of commands here. Fork a process, set things up, | |
3523 | execute the command. */ | |
ccc6cda3 | 3524 | static int |
726f6388 JA |
3525 | execute_simple_command (simple_command, pipe_in, pipe_out, async, fds_to_close) |
3526 | SIMPLE_COM *simple_command; | |
3527 | int pipe_in, pipe_out, async; | |
3528 | struct fd_bitmap *fds_to_close; | |
3529 | { | |
3530 | WORD_LIST *words, *lastword; | |
ccc6cda3 | 3531 | char *command_line, *lastarg, *temp; |
bc4cd23c | 3532 | int first_word_quoted, result, builtin_is_special, already_forked, dofork; |
95732b49 | 3533 | pid_t old_last_async_pid; |
f73dda09 | 3534 | sh_builtin_func_t *builtin; |
ccc6cda3 | 3535 | SHELL_VAR *func; |
726f6388 JA |
3536 | |
3537 | result = EXECUTION_SUCCESS; | |
ccc6cda3 | 3538 | special_builtin_failed = builtin_is_special = 0; |
cce855bc | 3539 | command_line = (char *)0; |
726f6388 | 3540 | |
ccc6cda3 | 3541 | /* If we're in a function, update the line number information. */ |
0001803f | 3542 | if (variable_context && interactive_shell && sourcelevel == 0) |
b80f6443 | 3543 | line_number -= function_line_number; |
7117c2d2 | 3544 | |
726f6388 JA |
3545 | /* Remember what this command line looks like at invocation. */ |
3546 | command_string_index = 0; | |
3547 | print_simple_command (simple_command); | |
726f6388 | 3548 | |
0628567a | 3549 | #if 0 |
95732b49 | 3550 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) |
0628567a JA |
3551 | #else |
3552 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3553 | #endif | |
b80f6443 JA |
3554 | { |
3555 | FREE (the_printed_command_except_trap); | |
95732b49 | 3556 | the_printed_command_except_trap = the_printed_command ? savestring (the_printed_command) : (char *)0; |
b80f6443 JA |
3557 | } |
3558 | ||
3559 | /* Run the debug trap before each simple command, but do it after we | |
3560 | update the line number information. */ | |
3561 | result = run_debug_trap (); | |
3562 | #if defined (DEBUGGER) | |
3563 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3564 | skip the command. */ | |
3565 | if (debugging_mode && result != EXECUTION_SUCCESS) | |
3566 | return (EXECUTION_SUCCESS); | |
3567 | #endif | |
3568 | ||
726f6388 | 3569 | first_word_quoted = |
3185942a | 3570 | simple_command->words ? (simple_command->words->word->flags & W_QUOTED) : 0; |
726f6388 | 3571 | |
95732b49 | 3572 | last_command_subst_pid = NO_PID; |
b72432fd | 3573 | old_last_async_pid = last_asynchronous_pid; |
726f6388 | 3574 | |
bc4cd23c JA |
3575 | already_forked = dofork = 0; |
3576 | ||
3577 | /* If we're in a pipeline or run in the background, set DOFORK so we | |
3578 | make the child early, before word expansion. This keeps assignment | |
3579 | statements from affecting the parent shell's environment when they | |
3580 | should not. */ | |
3581 | dofork = pipe_in != NO_PIPE || pipe_out != NO_PIPE || async; | |
3582 | ||
3583 | /* Something like `%2 &' should restart job 2 in the background, not cause | |
3584 | the shell to fork here. */ | |
3585 | if (dofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE && | |
3586 | simple_command->words && simple_command->words->word && | |
3587 | simple_command->words->word->word && | |
3588 | (simple_command->words->word->word[0] == '%')) | |
3589 | dofork = 0; | |
3590 | ||
3591 | if (dofork) | |
cce855bc | 3592 | { |
bb70624e JA |
3593 | /* Do this now, because execute_disk_command will do it anyway in the |
3594 | vast majority of cases. */ | |
3595 | maybe_make_export_env (); | |
3596 | ||
95732b49 JA |
3597 | /* Don't let a DEBUG trap overwrite the command string to be saved with |
3598 | the process/job associated with this child. */ | |
3599 | if (make_child (savestring (the_printed_command_except_trap), async) == 0) | |
cce855bc JA |
3600 | { |
3601 | already_forked = 1; | |
3602 | simple_command->flags |= CMD_NO_FORK; | |
3603 | ||
95732b49 JA |
3604 | subshell_environment = SUBSHELL_FORK; |
3605 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
3606 | subshell_environment |= SUBSHELL_PIPE; | |
3607 | if (async) | |
3608 | subshell_environment |= SUBSHELL_ASYNC; | |
28ef6c31 | 3609 | |
bb70624e JA |
3610 | /* We need to do this before piping to handle some really |
3611 | pathological cases where one of the pipe file descriptors | |
3612 | is < 2. */ | |
3613 | if (fds_to_close) | |
3614 | close_fd_bitmap (fds_to_close); | |
3615 | ||
cce855bc | 3616 | do_piping (pipe_in, pipe_out); |
f73dda09 | 3617 | pipe_in = pipe_out = NO_PIPE; |
3185942a JA |
3618 | #if defined (COPROCESS_SUPPORT) |
3619 | coproc_closeall (); | |
3620 | #endif | |
cce855bc | 3621 | |
b72432fd | 3622 | last_asynchronous_pid = old_last_async_pid; |
cce855bc JA |
3623 | } |
3624 | else | |
3625 | { | |
3626 | close_pipes (pipe_in, pipe_out); | |
3627 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
3628 | unlink_fifo_list (); | |
3629 | #endif | |
3630 | command_line = (char *)NULL; /* don't free this. */ | |
3631 | bind_lastarg ((char *)NULL); | |
3632 | return (result); | |
3633 | } | |
3634 | } | |
3635 | ||
726f6388 JA |
3636 | /* If we are re-running this as the result of executing the `command' |
3637 | builtin, do not expand the command words a second time. */ | |
3638 | if ((simple_command->flags & CMD_INHIBIT_EXPANSION) == 0) | |
3639 | { | |
3640 | current_fds_to_close = fds_to_close; | |
ccc6cda3 | 3641 | fix_assignment_words (simple_command->words); |
3185942a JA |
3642 | /* Pass the ignore return flag down to command substitutions */ |
3643 | if (simple_command->flags & CMD_IGNORE_RETURN) /* XXX */ | |
3644 | comsub_ignore_return++; | |
726f6388 | 3645 | words = expand_words (simple_command->words); |
3185942a JA |
3646 | if (simple_command->flags & CMD_IGNORE_RETURN) |
3647 | comsub_ignore_return--; | |
726f6388 JA |
3648 | current_fds_to_close = (struct fd_bitmap *)NULL; |
3649 | } | |
3650 | else | |
3651 | words = copy_word_list (simple_command->words); | |
3652 | ||
726f6388 JA |
3653 | /* It is possible for WORDS not to have anything left in it. |
3654 | Perhaps all the words consisted of `$foo', and there was | |
3655 | no variable `$foo'. */ | |
ccc6cda3 | 3656 | if (words == 0) |
726f6388 | 3657 | { |
b80f6443 | 3658 | this_command_name = 0; |
ccc6cda3 | 3659 | result = execute_null_command (simple_command->redirects, |
cce855bc | 3660 | pipe_in, pipe_out, |
95732b49 | 3661 | already_forked ? 0 : async); |
cce855bc JA |
3662 | if (already_forked) |
3663 | exit (result); | |
3664 | else | |
3665 | { | |
3666 | bind_lastarg ((char *)NULL); | |
3667 | set_pipestatus_from_exit (result); | |
3668 | return (result); | |
3669 | } | |
ccc6cda3 | 3670 | } |
726f6388 | 3671 | |
ccc6cda3 | 3672 | lastarg = (char *)NULL; |
726f6388 | 3673 | |
ccc6cda3 | 3674 | begin_unwind_frame ("simple-command"); |
726f6388 | 3675 | |
ccc6cda3 | 3676 | if (echo_command_at_execute) |
b80f6443 | 3677 | xtrace_print_word_list (words, 1); |
726f6388 | 3678 | |
f73dda09 | 3679 | builtin = (sh_builtin_func_t *)NULL; |
ccc6cda3 JA |
3680 | func = (SHELL_VAR *)NULL; |
3681 | if ((simple_command->flags & CMD_NO_FUNCTIONS) == 0) | |
3682 | { | |
3683 | /* Posix.2 says special builtins are found before functions. We | |
3684 | don't set builtin_is_special anywhere other than here, because | |
3685 | this path is followed only when the `command' builtin is *not* | |
3686 | being used, and we don't want to exit the shell if a special | |
3687 | builtin executed with `command builtin' fails. `command' is not | |
3688 | a special builtin. */ | |
3689 | if (posixly_correct) | |
3690 | { | |
3691 | builtin = find_special_builtin (words->word->word); | |
3692 | if (builtin) | |
3693 | builtin_is_special = 1; | |
726f6388 | 3694 | } |
ccc6cda3 | 3695 | if (builtin == 0) |
726f6388 | 3696 | func = find_function (words->word->word); |
ccc6cda3 | 3697 | } |
726f6388 | 3698 | |
b80f6443 JA |
3699 | /* In POSIX mode, assignment errors in the temporary environment cause a |
3700 | non-interactive shell to exit. */ | |
3701 | if (builtin_is_special && interactive_shell == 0 && tempenv_assign_error) | |
3702 | { | |
3703 | last_command_exit_value = EXECUTION_FAILURE; | |
3704 | jump_to_top_level (ERREXIT); | |
3705 | } | |
3706 | ||
ccc6cda3 JA |
3707 | add_unwind_protect (dispose_words, words); |
3708 | QUIT; | |
726f6388 | 3709 | |
ccc6cda3 JA |
3710 | /* Bind the last word in this command to "$_" after execution. */ |
3711 | for (lastword = words; lastword->next; lastword = lastword->next) | |
3712 | ; | |
3713 | lastarg = lastword->word->word; | |
726f6388 JA |
3714 | |
3715 | #if defined (JOB_CONTROL) | |
ccc6cda3 | 3716 | /* Is this command a job control related thing? */ |
cce855bc | 3717 | if (words->word->word[0] == '%' && already_forked == 0) |
ccc6cda3 JA |
3718 | { |
3719 | this_command_name = async ? "bg" : "fg"; | |
726f6388 | 3720 | last_shell_builtin = this_shell_builtin; |
ccc6cda3 JA |
3721 | this_shell_builtin = builtin_address (this_command_name); |
3722 | result = (*this_shell_builtin) (words); | |
3723 | goto return_result; | |
3724 | } | |
726f6388 | 3725 | |
ccc6cda3 JA |
3726 | /* One other possiblilty. The user may want to resume an existing job. |
3727 | If they do, find out whether this word is a candidate for a running | |
3728 | job. */ | |
cce855bc | 3729 | if (job_control && already_forked == 0 && async == 0 && |
ccc6cda3 JA |
3730 | !first_word_quoted && |
3731 | !words->next && | |
3732 | words->word->word[0] && | |
3733 | !simple_command->redirects && | |
3734 | pipe_in == NO_PIPE && | |
3735 | pipe_out == NO_PIPE && | |
3736 | (temp = get_string_value ("auto_resume"))) | |
3737 | { | |
7117c2d2 | 3738 | int job, jflags, started_status; |
ccc6cda3 | 3739 | |
7117c2d2 JA |
3740 | jflags = JM_STOPPED|JM_FIRSTMATCH; |
3741 | if (STREQ (temp, "exact")) | |
3742 | jflags |= JM_EXACT; | |
3743 | else if (STREQ (temp, "substring")) | |
3744 | jflags |= JM_SUBSTRING; | |
3745 | else | |
3746 | jflags |= JM_PREFIX; | |
3747 | job = get_job_by_name (words->word->word, jflags); | |
3748 | if (job != NO_JOB) | |
726f6388 | 3749 | { |
7117c2d2 JA |
3750 | run_unwind_frame ("simple-command"); |
3751 | this_command_name = "fg"; | |
3752 | last_shell_builtin = this_shell_builtin; | |
3753 | this_shell_builtin = builtin_address ("fg"); | |
ccc6cda3 | 3754 | |
7117c2d2 JA |
3755 | started_status = start_job (job, 1); |
3756 | return ((started_status < 0) ? EXECUTION_FAILURE : started_status); | |
726f6388 | 3757 | } |
ccc6cda3 JA |
3758 | } |
3759 | #endif /* JOB_CONTROL */ | |
726f6388 | 3760 | |
3185942a | 3761 | run_builtin: |
ccc6cda3 JA |
3762 | /* Remember the name of this command globally. */ |
3763 | this_command_name = words->word->word; | |
726f6388 | 3764 | |
ccc6cda3 JA |
3765 | QUIT; |
3766 | ||
3767 | /* This command could be a shell builtin or a user-defined function. | |
3768 | We have already found special builtins by this time, so we do not | |
3769 | set builtin_is_special. If this is a function or builtin, and we | |
3770 | have pipes, then fork a subshell in here. Otherwise, just execute | |
3771 | the command directly. */ | |
3772 | if (func == 0 && builtin == 0) | |
3773 | builtin = find_shell_builtin (this_command_name); | |
3774 | ||
3775 | last_shell_builtin = this_shell_builtin; | |
3776 | this_shell_builtin = builtin; | |
3777 | ||
3778 | if (builtin || func) | |
726f6388 | 3779 | { |
3185942a JA |
3780 | if (builtin) |
3781 | unwind_protect_int (executing_builtin); /* modified in execute_builtin */ | |
28ef6c31 | 3782 | if (already_forked) |
726f6388 | 3783 | { |
cce855bc JA |
3784 | /* reset_terminating_signals (); */ /* XXX */ |
3785 | /* Cancel traps, in trap.c. */ | |
3786 | restore_original_signals (); | |
726f6388 | 3787 | |
cce855bc | 3788 | if (async) |
ccc6cda3 | 3789 | { |
cce855bc JA |
3790 | if ((simple_command->flags & CMD_STDIN_REDIR) && |
3791 | pipe_in == NO_PIPE && | |
3792 | (stdin_redirects (simple_command->redirects) == 0)) | |
3793 | async_redirect_stdin (); | |
3794 | setup_async_signals (); | |
ccc6cda3 | 3795 | } |
cce855bc | 3796 | |
b80f6443 | 3797 | subshell_level++; |
cce855bc JA |
3798 | execute_subshell_builtin_or_function |
3799 | (words, simple_command->redirects, builtin, func, | |
3800 | pipe_in, pipe_out, async, fds_to_close, | |
3801 | simple_command->flags); | |
b80f6443 | 3802 | subshell_level--; |
726f6388 JA |
3803 | } |
3804 | else | |
3805 | { | |
ccc6cda3 JA |
3806 | result = execute_builtin_or_function |
3807 | (words, builtin, func, simple_command->redirects, fds_to_close, | |
3808 | simple_command->flags); | |
3809 | if (builtin) | |
3810 | { | |
3811 | if (result > EX_SHERRBASE) | |
3812 | { | |
cce855bc JA |
3813 | result = builtin_status (result); |
3814 | if (builtin_is_special) | |
3815 | special_builtin_failed = 1; | |
ccc6cda3 JA |
3816 | } |
3817 | /* In POSIX mode, if there are assignment statements preceding | |
3818 | a special builtin, they persist after the builtin | |
3819 | completes. */ | |
3820 | if (posixly_correct && builtin_is_special && temporary_env) | |
3821 | merge_temporary_env (); | |
3822 | } | |
3823 | else /* function */ | |
3824 | { | |
3825 | if (result == EX_USAGE) | |
3826 | result = EX_BADUSAGE; | |
3827 | else if (result > EX_SHERRBASE) | |
cce855bc | 3828 | result = EXECUTION_FAILURE; |
ccc6cda3 JA |
3829 | } |
3830 | ||
cce855bc JA |
3831 | set_pipestatus_from_exit (result); |
3832 | ||
726f6388 JA |
3833 | goto return_result; |
3834 | } | |
3835 | } | |
726f6388 | 3836 | |
3185942a JA |
3837 | if (autocd && interactive && words->word && is_dirname (words->word->word)) |
3838 | { | |
3839 | words = make_word_list (make_word ("cd"), words); | |
3840 | xtrace_print_word_list (words, 0); | |
3841 | goto run_builtin; | |
3842 | } | |
3843 | ||
cce855bc | 3844 | if (command_line == 0) |
0628567a | 3845 | command_line = savestring (the_printed_command_except_trap); |
cce855bc | 3846 | |
f1be666c JA |
3847 | #if defined (PROCESS_SUBSTITUTION) |
3848 | if ((subshell_environment & SUBSHELL_COMSUB) && (simple_command->flags & CMD_NO_FORK) && fifos_pending() > 0) | |
3849 | simple_command->flags &= ~CMD_NO_FORK; | |
3850 | #endif | |
3851 | ||
ccc6cda3 JA |
3852 | execute_disk_command (words, simple_command->redirects, command_line, |
3853 | pipe_in, pipe_out, async, fds_to_close, | |
d166f048 | 3854 | simple_command->flags); |
726f6388 JA |
3855 | |
3856 | return_result: | |
3857 | bind_lastarg (lastarg); | |
ccc6cda3 | 3858 | FREE (command_line); |
b80f6443 JA |
3859 | dispose_words (words); |
3860 | discard_unwind_frame ("simple-command"); | |
3861 | this_command_name = (char *)NULL; /* points to freed memory now */ | |
726f6388 JA |
3862 | return (result); |
3863 | } | |
3864 | ||
ccc6cda3 JA |
3865 | /* Translate the special builtin exit statuses. We don't really need a |
3866 | function for this; it's a placeholder for future work. */ | |
3867 | static int | |
3868 | builtin_status (result) | |
3869 | int result; | |
3870 | { | |
3871 | int r; | |
3872 | ||
3873 | switch (result) | |
3874 | { | |
3875 | case EX_USAGE: | |
3876 | r = EX_BADUSAGE; | |
3877 | break; | |
3878 | case EX_REDIRFAIL: | |
3879 | case EX_BADSYNTAX: | |
3880 | case EX_BADASSIGN: | |
3881 | case EX_EXPFAIL: | |
3882 | r = EXECUTION_FAILURE; | |
3883 | break; | |
3884 | default: | |
3885 | r = EXECUTION_SUCCESS; | |
3886 | break; | |
3887 | } | |
3888 | return (r); | |
3889 | } | |
3890 | ||
726f6388 JA |
3891 | static int |
3892 | execute_builtin (builtin, words, flags, subshell) | |
f73dda09 | 3893 | sh_builtin_func_t *builtin; |
726f6388 JA |
3894 | WORD_LIST *words; |
3895 | int flags, subshell; | |
3896 | { | |
d166f048 | 3897 | int old_e_flag, result, eval_unwind; |
7117c2d2 | 3898 | int isbltinenv; |
0001803f | 3899 | char *error_trap; |
726f6388 | 3900 | |
3185942a JA |
3901 | #if 0 |
3902 | /* XXX -- added 12/11 */ | |
3903 | terminate_immediately++; | |
3904 | #endif | |
3905 | ||
0001803f | 3906 | error_trap = 0; |
ccc6cda3 | 3907 | old_e_flag = exit_immediately_on_error; |
726f6388 JA |
3908 | /* The eval builtin calls parse_and_execute, which does not know about |
3909 | the setting of flags, and always calls the execution functions with | |
3910 | flags that will exit the shell on an error if -e is set. If the | |
3911 | eval builtin is being called, and we're supposed to ignore the exit | |
0001803f CR |
3912 | value of the command, we turn the -e flag off ourselves and disable |
3913 | the ERR trap, then restore them when the command completes. This is | |
3914 | also a problem (as below) for the command and source/. builtins. */ | |
3185942a JA |
3915 | if (subshell == 0 && (flags & CMD_IGNORE_RETURN) && |
3916 | (builtin == eval_builtin || builtin == command_builtin || builtin == source_builtin)) | |
726f6388 JA |
3917 | { |
3918 | begin_unwind_frame ("eval_builtin"); | |
3919 | unwind_protect_int (exit_immediately_on_error); | |
0001803f CR |
3920 | error_trap = TRAP_STRING (ERROR_TRAP); |
3921 | if (error_trap) | |
3922 | { | |
3923 | error_trap = savestring (error_trap); | |
3924 | add_unwind_protect (xfree, error_trap); | |
3925 | add_unwind_protect (set_error_trap, error_trap); | |
3926 | restore_default_signal (ERROR_TRAP); | |
3927 | } | |
726f6388 | 3928 | exit_immediately_on_error = 0; |
d166f048 | 3929 | eval_unwind = 1; |
726f6388 | 3930 | } |
d166f048 JA |
3931 | else |
3932 | eval_unwind = 0; | |
726f6388 JA |
3933 | |
3934 | /* The temporary environment for a builtin is supposed to apply to | |
3935 | all commands executed by that builtin. Currently, this is a | |
95732b49 JA |
3936 | problem only with the `unset', `source' and `eval' builtins. */ |
3937 | ||
3938 | isbltinenv = (builtin == source_builtin || builtin == eval_builtin || builtin == unset_builtin); | |
3939 | ||
7117c2d2 | 3940 | if (isbltinenv) |
726f6388 JA |
3941 | { |
3942 | if (subshell == 0) | |
3943 | begin_unwind_frame ("builtin_env"); | |
3944 | ||
3945 | if (temporary_env) | |
3946 | { | |
7117c2d2 | 3947 | push_scope (VC_BLTNENV, temporary_env); |
726f6388 | 3948 | if (subshell == 0) |
95732b49 | 3949 | add_unwind_protect (pop_scope, (flags & CMD_COMMAND_BUILTIN) ? 0 : "1"); |
7117c2d2 | 3950 | temporary_env = (HASH_TABLE *)NULL; |
726f6388 | 3951 | } |
28ef6c31 JA |
3952 | } |
3953 | ||
3954 | /* `return' does a longjmp() back to a saved environment in execute_function. | |
3955 | If a variable assignment list preceded the command, and the shell is | |
3956 | running in POSIX mode, we need to merge that into the shell_variables | |
3957 | table, since `return' is a POSIX special builtin. */ | |
3958 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
3959 | { | |
3960 | begin_unwind_frame ("return_temp_env"); | |
3961 | add_unwind_protect (merge_temporary_env, (char *)NULL); | |
726f6388 JA |
3962 | } |
3963 | ||
3185942a | 3964 | executing_builtin++; |
726f6388 JA |
3965 | result = ((*builtin) (words->next)); |
3966 | ||
28ef6c31 JA |
3967 | /* This shouldn't happen, but in case `return' comes back instead of |
3968 | longjmp'ing, we need to unwind. */ | |
3969 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
3970 | discard_unwind_frame ("return_temp_env"); | |
3971 | ||
7117c2d2 JA |
3972 | if (subshell == 0 && isbltinenv) |
3973 | run_unwind_frame ("builtin_env"); | |
726f6388 | 3974 | |
d166f048 | 3975 | if (eval_unwind) |
726f6388 JA |
3976 | { |
3977 | exit_immediately_on_error += old_e_flag; | |
0001803f CR |
3978 | if (error_trap) |
3979 | { | |
3980 | set_error_trap (error_trap); | |
3981 | xfree (error_trap); | |
3982 | } | |
726f6388 JA |
3983 | discard_unwind_frame ("eval_builtin"); |
3984 | } | |
3985 | ||
3185942a JA |
3986 | #if 0 |
3987 | /* XXX -- added 12/11 */ | |
3988 | terminate_immediately--; | |
3989 | #endif | |
3990 | ||
726f6388 JA |
3991 | return (result); |
3992 | } | |
3993 | ||
726f6388 JA |
3994 | static int |
3995 | execute_function (var, words, flags, fds_to_close, async, subshell) | |
3996 | SHELL_VAR *var; | |
3997 | WORD_LIST *words; | |
f73dda09 | 3998 | int flags; |
726f6388 | 3999 | struct fd_bitmap *fds_to_close; |
f73dda09 | 4000 | int async, subshell; |
726f6388 JA |
4001 | { |
4002 | int return_val, result; | |
b80f6443 JA |
4003 | COMMAND *tc, *fc, *save_current; |
4004 | char *debug_trap, *error_trap, *return_trap; | |
4005 | #if defined (ARRAY_VARS) | |
95732b49 | 4006 | SHELL_VAR *funcname_v, *nfv, *bash_source_v, *bash_lineno_v; |
b80f6443 JA |
4007 | ARRAY *funcname_a, *bash_source_a, *bash_lineno_a; |
4008 | #endif | |
4009 | FUNCTION_DEF *shell_fn; | |
4010 | char *sfile, *t; | |
f73dda09 JA |
4011 | |
4012 | USE_VAR(fc); | |
726f6388 | 4013 | |
0001803f CR |
4014 | #if 0 /* for bash-4.2 */ |
4015 | if (funcnest_max > 0 && funcnest >= funcnest_max) | |
4016 | { | |
4017 | internal_error ("%s: maximum function nesting level exceeded (%d)", var->name, funcnest); | |
4018 | jump_to_top_level (DISCARD); | |
4019 | } | |
4020 | #endif | |
4021 | ||
b80f6443 JA |
4022 | #if defined (ARRAY_VARS) |
4023 | GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a); | |
4024 | GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a); | |
4025 | GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a); | |
4026 | #endif | |
4027 | ||
726f6388 JA |
4028 | tc = (COMMAND *)copy_command (function_cell (var)); |
4029 | if (tc && (flags & CMD_IGNORE_RETURN)) | |
4030 | tc->flags |= CMD_IGNORE_RETURN; | |
4031 | ||
726f6388 JA |
4032 | if (subshell == 0) |
4033 | { | |
ccc6cda3 | 4034 | begin_unwind_frame ("function_calling"); |
7117c2d2 | 4035 | push_context (var->name, subshell, temporary_env); |
726f6388 JA |
4036 | add_unwind_protect (pop_context, (char *)NULL); |
4037 | unwind_protect_int (line_number); | |
ccc6cda3 JA |
4038 | unwind_protect_int (return_catch_flag); |
4039 | unwind_protect_jmp_buf (return_catch); | |
4040 | add_unwind_protect (dispose_command, (char *)tc); | |
bb70624e | 4041 | unwind_protect_pointer (this_shell_function); |
ccc6cda3 | 4042 | unwind_protect_int (loop_level); |
0001803f | 4043 | unwind_protect_int (funcnest); |
726f6388 | 4044 | } |
7117c2d2 JA |
4045 | else |
4046 | push_context (var->name, subshell, temporary_env); /* don't unwind-protect for subshells */ | |
4047 | ||
4048 | temporary_env = (HASH_TABLE *)NULL; | |
726f6388 | 4049 | |
bb70624e JA |
4050 | this_shell_function = var; |
4051 | make_funcname_visible (1); | |
4052 | ||
f73dda09 JA |
4053 | debug_trap = TRAP_STRING(DEBUG_TRAP); |
4054 | error_trap = TRAP_STRING(ERROR_TRAP); | |
b80f6443 | 4055 | return_trap = TRAP_STRING(RETURN_TRAP); |
f73dda09 | 4056 | |
b80f6443 JA |
4057 | /* The order of the unwind protects for debug_trap, error_trap and |
4058 | return_trap is important here! unwind-protect commands are run | |
4059 | in reverse order of registration. If this causes problems, take | |
4060 | out the xfree unwind-protect calls and live with the small memory leak. */ | |
4061 | ||
4062 | /* function_trace_mode != 0 means that all functions inherit the DEBUG trap. | |
4063 | if the function has the trace attribute set, it inherits the DEBUG trap */ | |
4064 | if (debug_trap && ((trace_p (var) == 0) && function_trace_mode == 0)) | |
ccc6cda3 JA |
4065 | { |
4066 | if (subshell == 0) | |
4067 | { | |
4068 | debug_trap = savestring (debug_trap); | |
cce855bc | 4069 | add_unwind_protect (xfree, debug_trap); |
ccc6cda3 JA |
4070 | add_unwind_protect (set_debug_trap, debug_trap); |
4071 | } | |
4072 | restore_default_signal (DEBUG_TRAP); | |
4073 | } | |
726f6388 | 4074 | |
b80f6443 JA |
4075 | /* error_trace_mode != 0 means that functions inherit the ERR trap. */ |
4076 | if (error_trap && error_trace_mode == 0) | |
f73dda09 JA |
4077 | { |
4078 | if (subshell == 0) | |
4079 | { | |
4080 | error_trap = savestring (error_trap); | |
4081 | add_unwind_protect (xfree, error_trap); | |
4082 | add_unwind_protect (set_error_trap, error_trap); | |
4083 | } | |
4084 | restore_default_signal (ERROR_TRAP); | |
4085 | } | |
4086 | ||
95732b49 JA |
4087 | /* Shell functions inherit the RETURN trap if function tracing is on |
4088 | globally or on individually for this function. */ | |
4089 | #if 0 | |
b80f6443 | 4090 | if (return_trap && ((trace_p (var) == 0) && function_trace_mode == 0)) |
95732b49 JA |
4091 | #else |
4092 | if (return_trap && (signal_in_progress (DEBUG_TRAP) || ((trace_p (var) == 0) && function_trace_mode == 0))) | |
4093 | #endif | |
b80f6443 JA |
4094 | { |
4095 | if (subshell == 0) | |
4096 | { | |
4097 | return_trap = savestring (return_trap); | |
4098 | add_unwind_protect (xfree, return_trap); | |
4099 | add_unwind_protect (set_return_trap, return_trap); | |
4100 | } | |
4101 | restore_default_signal (RETURN_TRAP); | |
4102 | } | |
4103 | ||
4104 | funcnest++; | |
4105 | #if defined (ARRAY_VARS) | |
4106 | /* This is quite similar to the code in shell.c and elsewhere. */ | |
4107 | shell_fn = find_function_def (this_shell_function->name); | |
4108 | sfile = shell_fn ? shell_fn->source_file : ""; | |
4109 | array_push (funcname_a, this_shell_function->name); | |
4110 | ||
4111 | array_push (bash_source_a, sfile); | |
4112 | t = itos (executing_line_number ()); | |
4113 | array_push (bash_lineno_a, t); | |
4114 | free (t); | |
4115 | #endif | |
4116 | ||
726f6388 JA |
4117 | /* The temporary environment for a function is supposed to apply to |
4118 | all commands executed within the function body. */ | |
726f6388 | 4119 | |
726f6388 JA |
4120 | remember_args (words->next, 1); |
4121 | ||
b80f6443 JA |
4122 | /* Update BASH_ARGV and BASH_ARGC */ |
4123 | if (debugging_mode) | |
4124 | push_args (words->next); | |
4125 | ||
ccc6cda3 | 4126 | /* Number of the line on which the function body starts. */ |
b80f6443 | 4127 | line_number = function_line_number = tc->line; |
726f6388 | 4128 | |
726f6388 | 4129 | #if defined (JOB_CONTROL) |
95732b49 JA |
4130 | if (subshell) |
4131 | stop_pipeline (async, (COMMAND *)NULL); | |
726f6388 | 4132 | #endif |
726f6388 | 4133 | |
95732b49 | 4134 | fc = tc; |
726f6388 JA |
4135 | |
4136 | return_catch_flag++; | |
4137 | return_val = setjmp (return_catch); | |
4138 | ||
4139 | if (return_val) | |
95732b49 JA |
4140 | { |
4141 | result = return_catch_value; | |
4142 | /* Run the RETURN trap in the function's context. */ | |
4143 | save_current = currently_executing_command; | |
4144 | run_return_trap (); | |
4145 | currently_executing_command = save_current; | |
4146 | } | |
726f6388 | 4147 | else |
b80f6443 JA |
4148 | { |
4149 | /* Run the debug trap here so we can trap at the start of a function's | |
4150 | execution rather than the execution of the body's first command. */ | |
4151 | showing_function_line = 1; | |
4152 | save_current = currently_executing_command; | |
4153 | result = run_debug_trap (); | |
4154 | #if defined (DEBUGGER) | |
4155 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
4156 | skip the command. */ | |
4157 | if (debugging_mode == 0 || result == EXECUTION_SUCCESS) | |
4158 | { | |
4159 | showing_function_line = 0; | |
4160 | currently_executing_command = save_current; | |
4161 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
4162 | ||
4163 | /* Run the RETURN trap in the function's context */ | |
4164 | save_current = currently_executing_command; | |
4165 | run_return_trap (); | |
4166 | currently_executing_command = save_current; | |
4167 | } | |
4168 | #else | |
4169 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
95732b49 JA |
4170 | |
4171 | save_current = currently_executing_command; | |
4172 | run_return_trap (); | |
4173 | currently_executing_command = save_current; | |
b80f6443 JA |
4174 | #endif |
4175 | showing_function_line = 0; | |
4176 | } | |
4177 | ||
4178 | /* Restore BASH_ARGC and BASH_ARGV */ | |
4179 | if (debugging_mode) | |
4180 | pop_args (); | |
726f6388 | 4181 | |
ccc6cda3 | 4182 | if (subshell == 0) |
726f6388 JA |
4183 | run_unwind_frame ("function_calling"); |
4184 | ||
b80f6443 | 4185 | #if defined (ARRAY_VARS) |
95732b49 JA |
4186 | /* These two variables cannot be unset, and cannot be affected by the |
4187 | function. */ | |
b80f6443 | 4188 | array_pop (bash_source_a); |
b80f6443 | 4189 | array_pop (bash_lineno_a); |
95732b49 JA |
4190 | |
4191 | /* FUNCNAME can be unset, and so can potentially be changed by the | |
4192 | function. */ | |
4193 | GET_ARRAY_FROM_VAR ("FUNCNAME", nfv, funcname_a); | |
4194 | if (nfv == funcname_v) | |
4195 | array_pop (funcname_a); | |
b80f6443 JA |
4196 | #endif |
4197 | ||
bb70624e | 4198 | if (variable_context == 0 || this_shell_function == 0) |
0001803f CR |
4199 | { |
4200 | make_funcname_visible (0); | |
4201 | #if defined (PROCESS_SUBSTITUTION) | |
4202 | unlink_fifo_list (); | |
4203 | #endif | |
4204 | } | |
4205 | ||
726f6388 JA |
4206 | return (result); |
4207 | } | |
4208 | ||
bb70624e JA |
4209 | /* A convenience routine for use by other parts of the shell to execute |
4210 | a particular shell function. */ | |
4211 | int | |
4212 | execute_shell_function (var, words) | |
4213 | SHELL_VAR *var; | |
4214 | WORD_LIST *words; | |
4215 | { | |
4216 | int ret; | |
4217 | struct fd_bitmap *bitmap; | |
4218 | ||
4219 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
4220 | begin_unwind_frame ("execute-shell-function"); | |
4221 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
4222 | ||
4223 | ret = execute_function (var, words, 0, bitmap, 0, 0); | |
4224 | ||
4225 | dispose_fd_bitmap (bitmap); | |
4226 | discard_unwind_frame ("execute-shell-function"); | |
4227 | ||
4228 | return ret; | |
4229 | } | |
4230 | ||
726f6388 JA |
4231 | /* Execute a shell builtin or function in a subshell environment. This |
4232 | routine does not return; it only calls exit(). If BUILTIN is non-null, | |
4233 | it points to a function to call to execute a shell builtin; otherwise | |
4234 | VAR points at the body of a function to execute. WORDS is the arguments | |
4235 | to the command, REDIRECTS specifies redirections to perform before the | |
4236 | command is executed. */ | |
4237 | static void | |
4238 | execute_subshell_builtin_or_function (words, redirects, builtin, var, | |
4239 | pipe_in, pipe_out, async, fds_to_close, | |
4240 | flags) | |
4241 | WORD_LIST *words; | |
4242 | REDIRECT *redirects; | |
f73dda09 | 4243 | sh_builtin_func_t *builtin; |
726f6388 JA |
4244 | SHELL_VAR *var; |
4245 | int pipe_in, pipe_out, async; | |
4246 | struct fd_bitmap *fds_to_close; | |
4247 | int flags; | |
4248 | { | |
0628567a | 4249 | int result, r, funcvalue; |
bb70624e JA |
4250 | #if defined (JOB_CONTROL) |
4251 | int jobs_hack; | |
726f6388 | 4252 | |
b72432fd JA |
4253 | jobs_hack = (builtin == jobs_builtin) && |
4254 | ((subshell_environment & SUBSHELL_ASYNC) == 0 || pipe_out != NO_PIPE); | |
bb70624e JA |
4255 | #endif |
4256 | ||
4257 | /* A subshell is neither a login shell nor interactive. */ | |
4258 | login_shell = interactive = 0; | |
b72432fd | 4259 | |
0628567a JA |
4260 | if (async) |
4261 | subshell_environment |= SUBSHELL_ASYNC; | |
4262 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
4263 | subshell_environment |= SUBSHELL_PIPE; | |
726f6388 | 4264 | |
ccc6cda3 | 4265 | maybe_make_export_env (); /* XXX - is this needed? */ |
726f6388 JA |
4266 | |
4267 | #if defined (JOB_CONTROL) | |
4268 | /* Eradicate all traces of job control after we fork the subshell, so | |
4269 | all jobs begun by this subshell are in the same process group as | |
4270 | the shell itself. */ | |
4271 | ||
4272 | /* Allow the output of `jobs' to be piped. */ | |
b72432fd | 4273 | if (jobs_hack) |
726f6388 JA |
4274 | kill_current_pipeline (); |
4275 | else | |
4276 | without_job_control (); | |
4277 | ||
4278 | set_sigchld_handler (); | |
4279 | #endif /* JOB_CONTROL */ | |
4280 | ||
4281 | set_sigint_handler (); | |
4282 | ||
726f6388 JA |
4283 | if (fds_to_close) |
4284 | close_fd_bitmap (fds_to_close); | |
4285 | ||
bb70624e JA |
4286 | do_piping (pipe_in, pipe_out); |
4287 | ||
b80f6443 | 4288 | if (do_redirections (redirects, RX_ACTIVE) != 0) |
726f6388 JA |
4289 | exit (EXECUTION_FAILURE); |
4290 | ||
4291 | if (builtin) | |
4292 | { | |
726f6388 JA |
4293 | /* Give builtins a place to jump back to on failure, |
4294 | so we don't go back up to main(). */ | |
4295 | result = setjmp (top_level); | |
4296 | ||
0628567a JA |
4297 | /* Give the return builtin a place to jump to when executed in a subshell |
4298 | or pipeline */ | |
4299 | funcvalue = 0; | |
4300 | if (return_catch_flag && builtin == return_builtin) | |
4301 | funcvalue = setjmp (return_catch); | |
4302 | ||
726f6388 JA |
4303 | if (result == EXITPROG) |
4304 | exit (last_command_exit_value); | |
4305 | else if (result) | |
4306 | exit (EXECUTION_FAILURE); | |
0628567a JA |
4307 | else if (funcvalue) |
4308 | exit (return_catch_value); | |
726f6388 | 4309 | else |
cce855bc JA |
4310 | { |
4311 | r = execute_builtin (builtin, words, flags, 1); | |
3185942a | 4312 | fflush (stdout); |
cce855bc JA |
4313 | if (r == EX_USAGE) |
4314 | r = EX_BADUSAGE; | |
4315 | exit (r); | |
4316 | } | |
726f6388 JA |
4317 | } |
4318 | else | |
3185942a JA |
4319 | { |
4320 | r = execute_function (var, words, flags, fds_to_close, async, 1); | |
4321 | fflush (stdout); | |
4322 | exit (r); | |
4323 | } | |
726f6388 JA |
4324 | } |
4325 | ||
4326 | /* Execute a builtin or function in the current shell context. If BUILTIN | |
4327 | is non-null, it is the builtin command to execute, otherwise VAR points | |
4328 | to the body of a function. WORDS are the command's arguments, REDIRECTS | |
4329 | are the redirections to perform. FDS_TO_CLOSE is the usual bitmap of | |
4330 | file descriptors to close. | |
4331 | ||
4332 | If BUILTIN is exec_builtin, the redirections specified in REDIRECTS are | |
4333 | not undone before this function returns. */ | |
4334 | static int | |
4335 | execute_builtin_or_function (words, builtin, var, redirects, | |
4336 | fds_to_close, flags) | |
4337 | WORD_LIST *words; | |
f73dda09 | 4338 | sh_builtin_func_t *builtin; |
726f6388 JA |
4339 | SHELL_VAR *var; |
4340 | REDIRECT *redirects; | |
4341 | struct fd_bitmap *fds_to_close; | |
4342 | int flags; | |
4343 | { | |
ccc6cda3 | 4344 | int result; |
726f6388 | 4345 | REDIRECT *saved_undo_list; |
f73dda09 | 4346 | sh_builtin_func_t *saved_this_shell_builtin; |
726f6388 | 4347 | |
b80f6443 | 4348 | if (do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE) != 0) |
726f6388 JA |
4349 | { |
4350 | cleanup_redirects (redirection_undo_list); | |
4351 | redirection_undo_list = (REDIRECT *)NULL; | |
4352 | dispose_exec_redirects (); | |
ccc6cda3 | 4353 | return (EX_REDIRFAIL); /* was EXECUTION_FAILURE */ |
726f6388 JA |
4354 | } |
4355 | ||
28ef6c31 | 4356 | saved_this_shell_builtin = this_shell_builtin; |
726f6388 JA |
4357 | saved_undo_list = redirection_undo_list; |
4358 | ||
4359 | /* Calling the "exec" builtin changes redirections forever. */ | |
4360 | if (builtin == exec_builtin) | |
4361 | { | |
4362 | dispose_redirects (saved_undo_list); | |
4363 | saved_undo_list = exec_redirection_undo_list; | |
4364 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
4365 | } | |
4366 | else | |
4367 | dispose_exec_redirects (); | |
4368 | ||
4369 | if (saved_undo_list) | |
4370 | { | |
4371 | begin_unwind_frame ("saved redirects"); | |
ccc6cda3 | 4372 | add_unwind_protect (cleanup_redirects, (char *)saved_undo_list); |
726f6388 JA |
4373 | } |
4374 | ||
4375 | redirection_undo_list = (REDIRECT *)NULL; | |
4376 | ||
4377 | if (builtin) | |
4378 | result = execute_builtin (builtin, words, flags, 0); | |
4379 | else | |
4380 | result = execute_function (var, words, flags, fds_to_close, 0, 0); | |
4381 | ||
b80f6443 | 4382 | /* We do this before undoing the effects of any redirections. */ |
3185942a JA |
4383 | fflush (stdout); |
4384 | fpurge (stdout); | |
b80f6443 JA |
4385 | if (ferror (stdout)) |
4386 | clearerr (stdout); | |
4387 | ||
28ef6c31 JA |
4388 | /* If we are executing the `command' builtin, but this_shell_builtin is |
4389 | set to `exec_builtin', we know that we have something like | |
4390 | `command exec [redirection]', since otherwise `exec' would have | |
4391 | overwritten the shell and we wouldn't get here. In this case, we | |
4392 | want to behave as if the `command' builtin had not been specified | |
4393 | and preserve the redirections. */ | |
4394 | if (builtin == command_builtin && this_shell_builtin == exec_builtin) | |
4395 | { | |
4396 | if (saved_undo_list) | |
4397 | dispose_redirects (saved_undo_list); | |
4398 | redirection_undo_list = exec_redirection_undo_list; | |
4399 | saved_undo_list = exec_redirection_undo_list = (REDIRECT *)NULL; | |
4400 | discard_unwind_frame ("saved_redirects"); | |
4401 | } | |
4402 | ||
726f6388 JA |
4403 | if (saved_undo_list) |
4404 | { | |
4405 | redirection_undo_list = saved_undo_list; | |
4406 | discard_unwind_frame ("saved redirects"); | |
4407 | } | |
4408 | ||
4409 | if (redirection_undo_list) | |
4410 | { | |
ccc6cda3 | 4411 | cleanup_redirects (redirection_undo_list); |
726f6388 JA |
4412 | redirection_undo_list = (REDIRECT *)NULL; |
4413 | } | |
4414 | ||
4415 | return (result); | |
4416 | } | |
4417 | ||
4418 | void | |
4419 | setup_async_signals () | |
4420 | { | |
b72432fd JA |
4421 | #if defined (__BEOS__) |
4422 | set_signal_handler (SIGHUP, SIG_IGN); /* they want csh-like behavior */ | |
4423 | #endif | |
4424 | ||
726f6388 JA |
4425 | #if defined (JOB_CONTROL) |
4426 | if (job_control == 0) | |
4427 | #endif | |
4428 | { | |
4429 | set_signal_handler (SIGINT, SIG_IGN); | |
4430 | set_signal_ignored (SIGINT); | |
4431 | set_signal_handler (SIGQUIT, SIG_IGN); | |
4432 | set_signal_ignored (SIGQUIT); | |
4433 | } | |
4434 | } | |
4435 | ||
4436 | /* Execute a simple command that is hopefully defined in a disk file | |
4437 | somewhere. | |
4438 | ||
4439 | 1) fork () | |
4440 | 2) connect pipes | |
4441 | 3) look up the command | |
4442 | 4) do redirections | |
4443 | 5) execve () | |
4444 | 6) If the execve failed, see if the file has executable mode set. | |
4445 | If so, and it isn't a directory, then execute its contents as | |
4446 | a shell script. | |
4447 | ||
4448 | Note that the filename hashing stuff has to take place up here, | |
4449 | in the parent. This is probably why the Bourne style shells | |
4450 | don't handle it, since that would require them to go through | |
b80f6443 JA |
4451 | this gnarly hair, for no good reason. |
4452 | ||
4453 | NOTE: callers expect this to fork or exit(). */ | |
3185942a JA |
4454 | |
4455 | /* Name of a shell function to call when a command name is not found. */ | |
4456 | #ifndef NOTFOUND_HOOK | |
4457 | # define NOTFOUND_HOOK "command_not_found_handle" | |
4458 | #endif | |
4459 | ||
726f6388 JA |
4460 | static void |
4461 | execute_disk_command (words, redirects, command_line, pipe_in, pipe_out, | |
d166f048 | 4462 | async, fds_to_close, cmdflags) |
726f6388 JA |
4463 | WORD_LIST *words; |
4464 | REDIRECT *redirects; | |
4465 | char *command_line; | |
4466 | int pipe_in, pipe_out, async; | |
4467 | struct fd_bitmap *fds_to_close; | |
d166f048 | 4468 | int cmdflags; |
726f6388 | 4469 | { |
ccc6cda3 | 4470 | char *pathname, *command, **args; |
d166f048 | 4471 | int nofork; |
bb70624e | 4472 | pid_t pid; |
3185942a JA |
4473 | SHELL_VAR *hookf; |
4474 | WORD_LIST *wl; | |
726f6388 | 4475 | |
d166f048 | 4476 | nofork = (cmdflags & CMD_NO_FORK); /* Don't fork, just exec, if no pipes */ |
726f6388 | 4477 | pathname = words->word->word; |
ccc6cda3 | 4478 | |
726f6388 | 4479 | #if defined (RESTRICTED_SHELL) |
b80f6443 | 4480 | command = (char *)NULL; |
0001803f | 4481 | if (restricted && mbschr (pathname, '/')) |
726f6388 | 4482 | { |
b80f6443 | 4483 | internal_error (_("%s: restricted: cannot specify `/' in command names"), |
726f6388 JA |
4484 | pathname); |
4485 | last_command_exit_value = EXECUTION_FAILURE; | |
b80f6443 JA |
4486 | |
4487 | /* If we're not going to fork below, we must already be in a child | |
4488 | process or a context in which it's safe to call exit(2). */ | |
4489 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
4490 | exit (last_command_exit_value); | |
4491 | else | |
4492 | goto parent_return; | |
726f6388 JA |
4493 | } |
4494 | #endif /* RESTRICTED_SHELL */ | |
4495 | ||
ccc6cda3 | 4496 | command = search_for_command (pathname); |
726f6388 | 4497 | |
ccc6cda3 | 4498 | if (command) |
726f6388 | 4499 | { |
ccc6cda3 JA |
4500 | maybe_make_export_env (); |
4501 | put_command_name_into_env (command); | |
726f6388 JA |
4502 | } |
4503 | ||
bb70624e | 4504 | /* We have to make the child before we check for the non-existence |
726f6388 JA |
4505 | of COMMAND, since we want the error messages to be redirected. */ |
4506 | /* If we can get away without forking and there are no pipes to deal with, | |
4507 | don't bother to fork, just directly exec the command. */ | |
4508 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
4509 | pid = 0; | |
4510 | else | |
4511 | pid = make_child (savestring (command_line), async); | |
4512 | ||
4513 | if (pid == 0) | |
4514 | { | |
4515 | int old_interactive; | |
4516 | ||
d166f048 JA |
4517 | #if 0 |
4518 | /* This has been disabled for the time being. */ | |
ccc6cda3 JA |
4519 | #if !defined (ARG_MAX) || ARG_MAX >= 10240 |
4520 | if (posixly_correct == 0) | |
f73dda09 | 4521 | put_gnu_argv_flags_into_env ((long)getpid (), glob_argv_flags); |
d166f048 | 4522 | #endif |
ccc6cda3 JA |
4523 | #endif |
4524 | ||
726f6388 JA |
4525 | /* Cancel traps, in trap.c. */ |
4526 | restore_original_signals (); | |
4527 | ||
4528 | /* restore_original_signals may have undone the work done | |
cce855bc JA |
4529 | by make_child to ensure that SIGINT and SIGQUIT are ignored |
4530 | in asynchronous children. */ | |
726f6388 | 4531 | if (async) |
d166f048 JA |
4532 | { |
4533 | if ((cmdflags & CMD_STDIN_REDIR) && | |
4534 | pipe_in == NO_PIPE && | |
4535 | (stdin_redirects (redirects) == 0)) | |
4536 | async_redirect_stdin (); | |
4537 | setup_async_signals (); | |
4538 | } | |
726f6388 | 4539 | |
bb70624e JA |
4540 | /* This functionality is now provided by close-on-exec of the |
4541 | file descriptors manipulated by redirection and piping. | |
4542 | Some file descriptors still need to be closed in all children | |
4543 | because of the way bash does pipes; fds_to_close is a | |
4544 | bitmap of all such file descriptors. */ | |
4545 | if (fds_to_close) | |
4546 | close_fd_bitmap (fds_to_close); | |
4547 | ||
726f6388 JA |
4548 | do_piping (pipe_in, pipe_out); |
4549 | ||
f73dda09 | 4550 | old_interactive = interactive; |
726f6388 | 4551 | if (async) |
f73dda09 | 4552 | interactive = 0; |
726f6388 | 4553 | |
ccc6cda3 | 4554 | subshell_environment = SUBSHELL_FORK; |
726f6388 | 4555 | |
b80f6443 | 4556 | if (redirects && (do_redirections (redirects, RX_ACTIVE) != 0)) |
726f6388 JA |
4557 | { |
4558 | #if defined (PROCESS_SUBSTITUTION) | |
4559 | /* Try to remove named pipes that may have been created as the | |
4560 | result of redirections. */ | |
4561 | unlink_fifo_list (); | |
4562 | #endif /* PROCESS_SUBSTITUTION */ | |
4563 | exit (EXECUTION_FAILURE); | |
4564 | } | |
4565 | ||
4566 | if (async) | |
4567 | interactive = old_interactive; | |
4568 | ||
ccc6cda3 | 4569 | if (command == 0) |
726f6388 | 4570 | { |
3185942a JA |
4571 | hookf = find_function (NOTFOUND_HOOK); |
4572 | if (hookf == 0) | |
4573 | { | |
4574 | internal_error (_("%s: command not found"), pathname); | |
4575 | exit (EX_NOTFOUND); /* Posix.2 says the exit status is 127 */ | |
4576 | } | |
4577 | ||
4578 | wl = make_word_list (make_word (NOTFOUND_HOOK), words); | |
4579 | exit (execute_shell_function (hookf, wl)); | |
726f6388 JA |
4580 | } |
4581 | ||
ccc6cda3 JA |
4582 | /* Execve expects the command name to be in args[0]. So we |
4583 | leave it there, in the same format that the user used to | |
4584 | type it in. */ | |
7117c2d2 | 4585 | args = strvec_from_word_list (words, 0, 0, (int *)NULL); |
726f6388 JA |
4586 | exit (shell_execve (command, args, export_env)); |
4587 | } | |
4588 | else | |
4589 | { | |
b80f6443 | 4590 | parent_return: |
726f6388 JA |
4591 | /* Make sure that the pipes are closed in the parent. */ |
4592 | close_pipes (pipe_in, pipe_out); | |
4593 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
0001803f CR |
4594 | if (variable_context == 0) |
4595 | unlink_fifo_list (); | |
726f6388 JA |
4596 | #endif |
4597 | FREE (command); | |
4598 | } | |
4599 | } | |
4600 | ||
28ef6c31 JA |
4601 | /* CPP defines to decide whether a particular index into the #! line |
4602 | corresponds to a valid interpreter name or argument character, or | |
4603 | whitespace. The MSDOS define is to allow \r to be treated the same | |
4604 | as \n. */ | |
4605 | ||
4606 | #if !defined (MSDOS) | |
4607 | # define STRINGCHAR(ind) \ | |
f73dda09 | 4608 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n') |
28ef6c31 | 4609 | # define WHITECHAR(ind) \ |
f73dda09 | 4610 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
4611 | #else /* MSDOS */ |
4612 | # define STRINGCHAR(ind) \ | |
f73dda09 | 4613 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n' && sample[ind] != '\r') |
28ef6c31 | 4614 | # define WHITECHAR(ind) \ |
f73dda09 | 4615 | (ind < sample_len && whitespace (sample[ind])) |
28ef6c31 JA |
4616 | #endif /* MSDOS */ |
4617 | ||
f73dda09 JA |
4618 | static char * |
4619 | getinterp (sample, sample_len, endp) | |
4620 | char *sample; | |
4621 | int sample_len, *endp; | |
726f6388 JA |
4622 | { |
4623 | register int i; | |
f73dda09 JA |
4624 | char *execname; |
4625 | int start; | |
726f6388 JA |
4626 | |
4627 | /* Find the name of the interpreter to exec. */ | |
f73dda09 | 4628 | for (i = 2; i < sample_len && whitespace (sample[i]); i++) |
726f6388 JA |
4629 | ; |
4630 | ||
28ef6c31 | 4631 | for (start = i; STRINGCHAR(i); i++) |
726f6388 JA |
4632 | ; |
4633 | ||
f73dda09 JA |
4634 | execname = substring (sample, start, i); |
4635 | ||
4636 | if (endp) | |
4637 | *endp = i; | |
4638 | return execname; | |
4639 | } | |
4640 | ||
4641 | #if !defined (HAVE_HASH_BANG_EXEC) | |
4642 | /* If the operating system on which we're running does not handle | |
4643 | the #! executable format, then help out. SAMPLE is the text read | |
4644 | from the file, SAMPLE_LEN characters. COMMAND is the name of | |
4645 | the script; it and ARGS, the arguments given by the user, will | |
4646 | become arguments to the specified interpreter. ENV is the environment | |
4647 | to pass to the interpreter. | |
4648 | ||
4649 | The word immediately following the #! is the interpreter to execute. | |
4650 | A single argument to the interpreter is allowed. */ | |
4651 | ||
4652 | static int | |
4653 | execute_shell_script (sample, sample_len, command, args, env) | |
4654 | char *sample; | |
4655 | int sample_len; | |
4656 | char *command; | |
4657 | char **args, **env; | |
4658 | { | |
4659 | char *execname, *firstarg; | |
4660 | int i, start, size_increment, larry; | |
4661 | ||
4662 | /* Find the name of the interpreter to exec. */ | |
4663 | execname = getinterp (sample, sample_len, &i); | |
726f6388 JA |
4664 | size_increment = 1; |
4665 | ||
4666 | /* Now the argument, if any. */ | |
28ef6c31 | 4667 | for (firstarg = (char *)NULL, start = i; WHITECHAR(i); i++) |
726f6388 JA |
4668 | ; |
4669 | ||
4670 | /* If there is more text on the line, then it is an argument for the | |
4671 | interpreter. */ | |
28ef6c31 JA |
4672 | |
4673 | if (STRINGCHAR(i)) | |
726f6388 | 4674 | { |
28ef6c31 | 4675 | for (start = i; STRINGCHAR(i); i++) |
726f6388 | 4676 | ; |
bb70624e | 4677 | firstarg = substring ((char *)sample, start, i); |
726f6388 JA |
4678 | size_increment = 2; |
4679 | } | |
4680 | ||
7117c2d2 JA |
4681 | larry = strvec_len (args) + size_increment; |
4682 | args = strvec_resize (args, larry + 1); | |
726f6388 JA |
4683 | |
4684 | for (i = larry - 1; i; i--) | |
4685 | args[i] = args[i - size_increment]; | |
4686 | ||
4687 | args[0] = execname; | |
4688 | if (firstarg) | |
4689 | { | |
4690 | args[1] = firstarg; | |
4691 | args[2] = command; | |
4692 | } | |
4693 | else | |
4694 | args[1] = command; | |
4695 | ||
4696 | args[larry] = (char *)NULL; | |
4697 | ||
4698 | return (shell_execve (execname, args, env)); | |
4699 | } | |
28ef6c31 JA |
4700 | #undef STRINGCHAR |
4701 | #undef WHITECHAR | |
4702 | ||
ccc6cda3 JA |
4703 | #endif /* !HAVE_HASH_BANG_EXEC */ |
4704 | ||
d166f048 JA |
4705 | static void |
4706 | initialize_subshell () | |
4707 | { | |
4708 | #if defined (ALIAS) | |
4709 | /* Forget about any aliases that we knew of. We are in a subshell. */ | |
4710 | delete_all_aliases (); | |
4711 | #endif /* ALIAS */ | |
4712 | ||
4713 | #if defined (HISTORY) | |
4714 | /* Forget about the history lines we have read. This is a non-interactive | |
4715 | subshell. */ | |
4716 | history_lines_this_session = 0; | |
4717 | #endif | |
4718 | ||
4719 | #if defined (JOB_CONTROL) | |
4720 | /* Forget about the way job control was working. We are in a subshell. */ | |
4721 | without_job_control (); | |
4722 | set_sigchld_handler (); | |
95732b49 | 4723 | init_job_stats (); |
d166f048 JA |
4724 | #endif /* JOB_CONTROL */ |
4725 | ||
4726 | /* Reset the values of the shell flags and options. */ | |
4727 | reset_shell_flags (); | |
4728 | reset_shell_options (); | |
4729 | reset_shopt_options (); | |
4730 | ||
28ef6c31 JA |
4731 | /* Zero out builtin_env, since this could be a shell script run from a |
4732 | sourced file with a temporary environment supplied to the `source/.' | |
4733 | builtin. Such variables are not supposed to be exported (empirical | |
7117c2d2 JA |
4734 | testing with sh and ksh). Just throw it away; don't worry about a |
4735 | memory leak. */ | |
4736 | if (vc_isbltnenv (shell_variables)) | |
4737 | shell_variables = shell_variables->down; | |
28ef6c31 JA |
4738 | |
4739 | clear_unwind_protect_list (0); | |
f1be666c JA |
4740 | /* XXX -- are there other things we should be resetting here? */ |
4741 | parse_and_execute_level = 0; /* nothing left to restore it */ | |
28ef6c31 JA |
4742 | |
4743 | /* We're no longer inside a shell function. */ | |
0001803f | 4744 | variable_context = return_catch_flag = funcnest = 0; |
28ef6c31 | 4745 | |
3185942a JA |
4746 | executing_list = 0; /* XXX */ |
4747 | ||
d166f048 JA |
4748 | /* If we're not interactive, close the file descriptor from which we're |
4749 | reading the current shell script. */ | |
cce855bc | 4750 | if (interactive_shell == 0) |
b80f6443 | 4751 | unset_bash_input (0); |
d166f048 JA |
4752 | } |
4753 | ||
ccc6cda3 JA |
4754 | #if defined (HAVE_SETOSTYPE) && defined (_POSIX_SOURCE) |
4755 | # define SETOSTYPE(x) __setostype(x) | |
4756 | #else | |
4757 | # define SETOSTYPE(x) | |
4758 | #endif | |
726f6388 | 4759 | |
28ef6c31 JA |
4760 | #define READ_SAMPLE_BUF(file, buf, len) \ |
4761 | do \ | |
4762 | { \ | |
4763 | fd = open(file, O_RDONLY); \ | |
4764 | if (fd >= 0) \ | |
4765 | { \ | |
f73dda09 | 4766 | len = read (fd, buf, 80); \ |
28ef6c31 JA |
4767 | close (fd); \ |
4768 | } \ | |
4769 | else \ | |
4770 | len = -1; \ | |
4771 | } \ | |
4772 | while (0) | |
4773 | ||
726f6388 JA |
4774 | /* Call execve (), handling interpreting shell scripts, and handling |
4775 | exec failures. */ | |
4776 | int | |
4777 | shell_execve (command, args, env) | |
4778 | char *command; | |
4779 | char **args, **env; | |
4780 | { | |
ccc6cda3 | 4781 | int larray, i, fd; |
f73dda09 | 4782 | char sample[80]; |
28ef6c31 | 4783 | int sample_len; |
ccc6cda3 JA |
4784 | |
4785 | SETOSTYPE (0); /* Some systems use for USG/POSIX semantics */ | |
726f6388 | 4786 | execve (command, args, env); |
28ef6c31 | 4787 | i = errno; /* error from execve() */ |
3185942a | 4788 | CHECK_TERMSIG; |
ccc6cda3 | 4789 | SETOSTYPE (1); |
726f6388 JA |
4790 | |
4791 | /* If we get to this point, then start checking out the file. | |
4792 | Maybe it is something we can hack ourselves. */ | |
28ef6c31 | 4793 | if (i != ENOEXEC) |
ccc6cda3 | 4794 | { |
3185942a | 4795 | if (file_isdir (command)) |
b80f6443 | 4796 | internal_error (_("%s: is a directory"), command); |
7117c2d2 JA |
4797 | else if (executable_file (command) == 0) |
4798 | { | |
4799 | errno = i; | |
4800 | file_error (command); | |
4801 | } | |
95732b49 JA |
4802 | /* errors not involving the path argument to execve. */ |
4803 | else if (i == E2BIG || i == ENOMEM) | |
4804 | { | |
4805 | errno = i; | |
4806 | file_error (command); | |
4807 | } | |
ccc6cda3 JA |
4808 | else |
4809 | { | |
7117c2d2 JA |
4810 | /* The file has the execute bits set, but the kernel refuses to |
4811 | run it for some reason. See why. */ | |
28ef6c31 JA |
4812 | #if defined (HAVE_HASH_BANG_EXEC) |
4813 | READ_SAMPLE_BUF (command, sample, sample_len); | |
4814 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') | |
4815 | { | |
f73dda09 | 4816 | char *interp; |
95732b49 | 4817 | int ilen; |
f73dda09 JA |
4818 | |
4819 | interp = getinterp (sample, sample_len, (int *)NULL); | |
95732b49 | 4820 | ilen = strlen (interp); |
28ef6c31 | 4821 | errno = i; |
95732b49 JA |
4822 | if (interp[ilen - 1] == '\r') |
4823 | { | |
4824 | interp = xrealloc (interp, ilen + 2); | |
4825 | interp[ilen - 1] = '^'; | |
4826 | interp[ilen] = 'M'; | |
4827 | interp[ilen + 1] = '\0'; | |
4828 | } | |
b80f6443 | 4829 | sys_error (_("%s: %s: bad interpreter"), command, interp ? interp : ""); |
f73dda09 | 4830 | FREE (interp); |
28ef6c31 JA |
4831 | return (EX_NOEXEC); |
4832 | } | |
4833 | #endif | |
ccc6cda3 | 4834 | errno = i; |
726f6388 | 4835 | file_error (command); |
ccc6cda3 | 4836 | } |
d166f048 | 4837 | return ((i == ENOENT) ? EX_NOTFOUND : EX_NOEXEC); /* XXX Posix.2 says that exit status is 126 */ |
ccc6cda3 | 4838 | } |
726f6388 | 4839 | |
ccc6cda3 JA |
4840 | /* This file is executable. |
4841 | If it begins with #!, then help out people with losing operating | |
4842 | systems. Otherwise, check to see if it is a binary file by seeing | |
28ef6c31 JA |
4843 | if the contents of the first line (or up to 80 characters) are in the |
4844 | ASCII set. If it's a text file, execute the contents as shell commands, | |
4845 | otherwise return 126 (EX_BINARY_FILE). */ | |
4846 | READ_SAMPLE_BUF (command, sample, sample_len); | |
ccc6cda3 | 4847 | |
28ef6c31 JA |
4848 | if (sample_len == 0) |
4849 | return (EXECUTION_SUCCESS); | |
ccc6cda3 | 4850 | |
28ef6c31 JA |
4851 | /* Is this supposed to be an executable script? |
4852 | If so, the format of the line is "#! interpreter [argument]". | |
4853 | A single argument is allowed. The BSD kernel restricts | |
4854 | the length of the entire line to 32 characters (32 bytes | |
4855 | being the size of the BSD exec header), but we allow 80 | |
4856 | characters. */ | |
4857 | if (sample_len > 0) | |
4858 | { | |
ccc6cda3 | 4859 | #if !defined (HAVE_HASH_BANG_EXEC) |
28ef6c31 JA |
4860 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') |
4861 | return (execute_shell_script (sample, sample_len, command, args, env)); | |
4862 | else | |
ccc6cda3 | 4863 | #endif |
28ef6c31 JA |
4864 | if (check_binary_file (sample, sample_len)) |
4865 | { | |
b80f6443 | 4866 | internal_error (_("%s: cannot execute binary file"), command); |
28ef6c31 | 4867 | return (EX_BINARY_FILE); |
726f6388 | 4868 | } |
ccc6cda3 JA |
4869 | } |
4870 | ||
28ef6c31 JA |
4871 | /* We have committed to attempting to execute the contents of this file |
4872 | as shell commands. */ | |
4873 | ||
d166f048 | 4874 | initialize_subshell (); |
726f6388 | 4875 | |
ccc6cda3 | 4876 | set_sigint_handler (); |
726f6388 | 4877 | |
ccc6cda3 | 4878 | /* Insert the name of this shell into the argument list. */ |
7117c2d2 JA |
4879 | larray = strvec_len (args) + 1; |
4880 | args = strvec_resize (args, larray + 1); | |
726f6388 | 4881 | |
ccc6cda3 JA |
4882 | for (i = larray - 1; i; i--) |
4883 | args[i] = args[i - 1]; | |
726f6388 | 4884 | |
ccc6cda3 JA |
4885 | args[0] = shell_name; |
4886 | args[1] = command; | |
4887 | args[larray] = (char *)NULL; | |
726f6388 | 4888 | |
ccc6cda3 JA |
4889 | if (args[0][0] == '-') |
4890 | args[0]++; | |
726f6388 | 4891 | |
ccc6cda3 JA |
4892 | #if defined (RESTRICTED_SHELL) |
4893 | if (restricted) | |
4894 | change_flag ('r', FLAG_OFF); | |
4895 | #endif | |
726f6388 | 4896 | |
ccc6cda3 JA |
4897 | if (subshell_argv) |
4898 | { | |
4899 | /* Can't free subshell_argv[0]; that is shell_name. */ | |
4900 | for (i = 1; i < subshell_argc; i++) | |
4901 | free (subshell_argv[i]); | |
4902 | free (subshell_argv); | |
4903 | } | |
4904 | ||
4905 | dispose_command (currently_executing_command); /* XXX */ | |
4906 | currently_executing_command = (COMMAND *)NULL; | |
4907 | ||
4908 | subshell_argc = larray; | |
4909 | subshell_argv = args; | |
4910 | subshell_envp = env; | |
4911 | ||
4912 | unbind_args (); /* remove the positional parameters */ | |
4913 | ||
4914 | longjmp (subshell_top_level, 1); | |
f73dda09 | 4915 | /*NOTREACHED*/ |
ccc6cda3 JA |
4916 | } |
4917 | ||
4918 | static int | |
4919 | execute_intern_function (name, function) | |
4920 | WORD_DESC *name; | |
4921 | COMMAND *function; | |
4922 | { | |
4923 | SHELL_VAR *var; | |
4924 | ||
4925 | if (check_identifier (name, posixly_correct) == 0) | |
4926 | { | |
4927 | if (posixly_correct && interactive_shell == 0) | |
4928 | { | |
3185942a | 4929 | last_command_exit_value = EX_BADUSAGE; |
b80f6443 | 4930 | jump_to_top_level (ERREXIT); |
ccc6cda3 JA |
4931 | } |
4932 | return (EXECUTION_FAILURE); | |
4933 | } | |
4934 | ||
4935 | var = find_function (name->word); | |
28ef6c31 | 4936 | if (var && (readonly_p (var) || noassign_p (var))) |
ccc6cda3 | 4937 | { |
28ef6c31 | 4938 | if (readonly_p (var)) |
b80f6443 | 4939 | internal_error (_("%s: readonly function"), var->name); |
ccc6cda3 JA |
4940 | return (EXECUTION_FAILURE); |
4941 | } | |
4942 | ||
4943 | bind_function (name->word, function); | |
4944 | return (EXECUTION_SUCCESS); | |
726f6388 JA |
4945 | } |
4946 | ||
d166f048 | 4947 | #if defined (INCLUDE_UNUSED) |
726f6388 | 4948 | #if defined (PROCESS_SUBSTITUTION) |
726f6388 JA |
4949 | void |
4950 | close_all_files () | |
4951 | { | |
4952 | register int i, fd_table_size; | |
4953 | ||
4954 | fd_table_size = getdtablesize (); | |
4955 | if (fd_table_size > 256) /* clamp to a reasonable value */ | |
7117c2d2 | 4956 | fd_table_size = 256; |
726f6388 JA |
4957 | |
4958 | for (i = 3; i < fd_table_size; i++) | |
4959 | close (i); | |
4960 | } | |
4961 | #endif /* PROCESS_SUBSTITUTION */ | |
d166f048 | 4962 | #endif |
726f6388 JA |
4963 | |
4964 | static void | |
4965 | close_pipes (in, out) | |
4966 | int in, out; | |
4967 | { | |
4968 | if (in >= 0) | |
4969 | close (in); | |
4970 | if (out >= 0) | |
4971 | close (out); | |
4972 | } | |
4973 | ||
b80f6443 JA |
4974 | static void |
4975 | dup_error (oldd, newd) | |
4976 | int oldd, newd; | |
4977 | { | |
4978 | sys_error (_("cannot duplicate fd %d to fd %d"), oldd, newd); | |
4979 | } | |
4980 | ||
726f6388 JA |
4981 | /* Redirect input and output to be from and to the specified pipes. |
4982 | NO_PIPE and REDIRECT_BOTH are handled correctly. */ | |
4983 | static void | |
4984 | do_piping (pipe_in, pipe_out) | |
4985 | int pipe_in, pipe_out; | |
4986 | { | |
4987 | if (pipe_in != NO_PIPE) | |
4988 | { | |
4989 | if (dup2 (pipe_in, 0) < 0) | |
b80f6443 | 4990 | dup_error (pipe_in, 0); |
726f6388 | 4991 | if (pipe_in > 0) |
cce855bc | 4992 | close (pipe_in); |
726f6388 JA |
4993 | } |
4994 | if (pipe_out != NO_PIPE) | |
4995 | { | |
4996 | if (pipe_out != REDIRECT_BOTH) | |
4997 | { | |
4998 | if (dup2 (pipe_out, 1) < 0) | |
b80f6443 | 4999 | dup_error (pipe_out, 1); |
726f6388 JA |
5000 | if (pipe_out == 0 || pipe_out > 1) |
5001 | close (pipe_out); | |
5002 | } | |
5003 | else | |
ccc6cda3 | 5004 | { |
cce855bc | 5005 | if (dup2 (1, 2) < 0) |
b80f6443 | 5006 | dup_error (1, 2); |
ccc6cda3 | 5007 | } |
d166f048 | 5008 | } |
726f6388 | 5009 | } |