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19baff85 CR |
1 | /* execute_cmd.c -- Execute a COMMAND structure. */ |
2 | ||
3 | /* Copyright (C) 1987-2010 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include "config.h" | |
22 | ||
23 | #if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX) | |
24 | #pragma alloca | |
25 | #endif /* _AIX && RISC6000 && !__GNUC__ */ | |
26 | ||
27 | #include <stdio.h> | |
28 | #include "chartypes.h" | |
29 | #include "bashtypes.h" | |
30 | #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) | |
31 | # include <sys/file.h> | |
32 | #endif | |
33 | #include "filecntl.h" | |
34 | #include "posixstat.h" | |
35 | #include <signal.h> | |
36 | #ifndef _MINIX | |
37 | # include <sys/param.h> | |
38 | #endif | |
39 | ||
40 | #if defined (HAVE_UNISTD_H) | |
41 | # include <unistd.h> | |
42 | #endif | |
43 | ||
44 | #include "posixtime.h" | |
45 | ||
46 | #if defined (HAVE_SYS_RESOURCE_H) && !defined (RLIMTYPE) | |
47 | # include <sys/resource.h> | |
48 | #endif | |
49 | ||
50 | #if defined (HAVE_SYS_TIMES_H) && defined (HAVE_TIMES) | |
51 | # include <sys/times.h> | |
52 | #endif | |
53 | ||
54 | #include <errno.h> | |
55 | ||
56 | #if !defined (errno) | |
57 | extern int errno; | |
58 | #endif | |
59 | ||
60 | #define NEED_FPURGE_DECL | |
61 | ||
62 | #include "bashansi.h" | |
63 | #include "bashintl.h" | |
64 | ||
65 | #include "memalloc.h" | |
66 | #include "shell.h" | |
67 | #include <y.tab.h> /* use <...> so we pick it up from the build directory */ | |
68 | #include "flags.h" | |
69 | #include "builtins.h" | |
70 | #include "hashlib.h" | |
71 | #include "jobs.h" | |
72 | #include "execute_cmd.h" | |
73 | #include "findcmd.h" | |
74 | #include "redir.h" | |
75 | #include "trap.h" | |
76 | #include "pathexp.h" | |
77 | #include "hashcmd.h" | |
78 | ||
79 | #if defined (COND_COMMAND) | |
80 | # include "test.h" | |
81 | #endif | |
82 | ||
83 | #include "builtins/common.h" | |
84 | #include "builtins/builtext.h" /* list of builtins */ | |
85 | ||
86 | #include <glob/strmatch.h> | |
87 | #include <tilde/tilde.h> | |
88 | ||
89 | #if defined (BUFFERED_INPUT) | |
90 | # include "input.h" | |
91 | #endif | |
92 | ||
93 | #if defined (ALIAS) | |
94 | # include "alias.h" | |
95 | #endif | |
96 | ||
97 | #if defined (HISTORY) | |
98 | # include "bashhist.h" | |
99 | #endif | |
100 | ||
101 | extern int dollar_dollar_pid; | |
102 | extern int posixly_correct; | |
103 | extern int expand_aliases; | |
104 | extern int autocd; | |
105 | extern int breaking, continuing, loop_level; | |
106 | extern int parse_and_execute_level, running_trap, sourcelevel; | |
107 | extern int command_string_index, line_number; | |
108 | extern int dot_found_in_search; | |
109 | extern int already_making_children; | |
110 | extern int tempenv_assign_error; | |
111 | extern char *the_printed_command, *shell_name; | |
112 | extern pid_t last_command_subst_pid; | |
113 | extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin; | |
114 | extern char **subshell_argv, **subshell_envp; | |
115 | extern int subshell_argc; | |
116 | extern time_t shell_start_time; | |
117 | #if 0 | |
118 | extern char *glob_argv_flags; | |
119 | #endif | |
120 | ||
121 | extern int close __P((int)); | |
122 | ||
123 | /* Static functions defined and used in this file. */ | |
124 | static void close_pipes __P((int, int)); | |
125 | static void do_piping __P((int, int)); | |
126 | static void bind_lastarg __P((char *)); | |
127 | static int shell_control_structure __P((enum command_type)); | |
128 | static void cleanup_redirects __P((REDIRECT *)); | |
129 | ||
130 | #if defined (JOB_CONTROL) | |
131 | static int restore_signal_mask __P((sigset_t *)); | |
132 | #endif | |
133 | ||
134 | static void async_redirect_stdin __P((void)); | |
135 | ||
136 | static int builtin_status __P((int)); | |
137 | ||
138 | static int execute_for_command __P((FOR_COM *)); | |
139 | #if defined (SELECT_COMMAND) | |
140 | static int displen __P((const char *)); | |
141 | static int print_index_and_element __P((int, int, WORD_LIST *)); | |
142 | static void indent __P((int, int)); | |
143 | static void print_select_list __P((WORD_LIST *, int, int, int)); | |
144 | static char *select_query __P((WORD_LIST *, int, char *, int)); | |
145 | static int execute_select_command __P((SELECT_COM *)); | |
146 | #endif | |
147 | #if defined (DPAREN_ARITHMETIC) | |
148 | static int execute_arith_command __P((ARITH_COM *)); | |
149 | #endif | |
150 | #if defined (COND_COMMAND) | |
151 | static int execute_cond_node __P((COND_COM *)); | |
152 | static int execute_cond_command __P((COND_COM *)); | |
153 | #endif | |
154 | #if defined (COMMAND_TIMING) | |
155 | static int mkfmt __P((char *, int, int, time_t, int)); | |
156 | static void print_formatted_time __P((FILE *, char *, | |
157 | time_t, int, time_t, int, | |
158 | time_t, int, int)); | |
159 | static int time_command __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
160 | #endif | |
161 | #if defined (ARITH_FOR_COMMAND) | |
162 | static intmax_t eval_arith_for_expr __P((WORD_LIST *, int *)); | |
163 | static int execute_arith_for_command __P((ARITH_FOR_COM *)); | |
164 | #endif | |
165 | static int execute_case_command __P((CASE_COM *)); | |
166 | static int execute_while_command __P((WHILE_COM *)); | |
167 | static int execute_until_command __P((WHILE_COM *)); | |
168 | static int execute_while_or_until __P((WHILE_COM *, int)); | |
169 | static int execute_if_command __P((IF_COM *)); | |
170 | static int execute_null_command __P((REDIRECT *, int, int, int)); | |
171 | static void fix_assignment_words __P((WORD_LIST *)); | |
172 | static int execute_simple_command __P((SIMPLE_COM *, int, int, int, struct fd_bitmap *)); | |
173 | static int execute_builtin __P((sh_builtin_func_t *, WORD_LIST *, int, int)); | |
174 | static int execute_function __P((SHELL_VAR *, WORD_LIST *, int, struct fd_bitmap *, int, int)); | |
175 | static int execute_builtin_or_function __P((WORD_LIST *, sh_builtin_func_t *, | |
176 | SHELL_VAR *, | |
177 | REDIRECT *, struct fd_bitmap *, int)); | |
178 | static void execute_subshell_builtin_or_function __P((WORD_LIST *, REDIRECT *, | |
179 | sh_builtin_func_t *, | |
180 | SHELL_VAR *, | |
181 | int, int, int, | |
182 | struct fd_bitmap *, | |
183 | int)); | |
184 | static int execute_disk_command __P((WORD_LIST *, REDIRECT *, char *, | |
185 | int, int, int, struct fd_bitmap *, int)); | |
186 | ||
187 | static char *getinterp __P((char *, int, int *)); | |
188 | static void initialize_subshell __P((void)); | |
189 | static int execute_in_subshell __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
190 | #if defined (COPROCESS_SUPPORT) | |
191 | static int execute_coproc __P((COMMAND *, int, int, struct fd_bitmap *)); | |
192 | #endif | |
193 | ||
194 | static int execute_pipeline __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
195 | ||
196 | static int execute_connection __P((COMMAND *, int, int, int, struct fd_bitmap *)); | |
197 | ||
198 | static int execute_intern_function __P((WORD_DESC *, COMMAND *)); | |
199 | ||
200 | /* Set to 1 if fd 0 was the subject of redirection to a subshell. Global | |
201 | so that reader_loop can set it to zero before executing a command. */ | |
202 | int stdin_redir; | |
203 | ||
204 | /* The name of the command that is currently being executed. | |
205 | `test' needs this, for example. */ | |
206 | char *this_command_name; | |
207 | ||
208 | /* The printed representation of the currently-executing command (same as | |
209 | the_printed_command), except when a trap is being executed. Useful for | |
210 | a debugger to know where exactly the program is currently executing. */ | |
211 | char *the_printed_command_except_trap; | |
212 | ||
213 | /* For catching RETURN in a function. */ | |
214 | int return_catch_flag; | |
215 | int return_catch_value; | |
216 | procenv_t return_catch; | |
217 | ||
218 | /* The value returned by the last synchronous command. */ | |
219 | int last_command_exit_value; | |
220 | ||
221 | /* Whether or not the last command (corresponding to last_command_exit_value) | |
222 | was terminated by a signal, and, if so, which one. */ | |
223 | int last_command_exit_signal; | |
224 | ||
225 | /* The list of redirections to perform which will undo the redirections | |
226 | that I made in the shell. */ | |
227 | REDIRECT *redirection_undo_list = (REDIRECT *)NULL; | |
228 | ||
229 | /* The list of redirections to perform which will undo the internal | |
230 | redirections performed by the `exec' builtin. These are redirections | |
231 | that must be undone even when exec discards redirection_undo_list. */ | |
232 | REDIRECT *exec_redirection_undo_list = (REDIRECT *)NULL; | |
233 | ||
234 | /* When greater than zero, value is the `level' of builtins we are | |
235 | currently executing (e.g. `eval echo a' would have it set to 2). */ | |
236 | int executing_builtin = 0; | |
237 | ||
238 | /* Non-zero if we are executing a command list (a;b;c, etc.) */ | |
239 | int executing_list = 0; | |
240 | ||
241 | /* Non-zero if failing commands in a command substitution should not exit the | |
242 | shell even if -e is set. Used to pass the CMD_IGNORE_RETURN flag down to | |
243 | commands run in command substitutions by parse_and_execute. */ | |
244 | int comsub_ignore_return = 0; | |
245 | ||
246 | /* Non-zero if we have just forked and are currently running in a subshell | |
247 | environment. */ | |
248 | int subshell_environment; | |
249 | ||
250 | /* Count of nested subshells, like SHLVL. Available via $BASH_SUBSHELL */ | |
251 | int subshell_level = 0; | |
252 | ||
253 | /* Currently-executing shell function. */ | |
254 | SHELL_VAR *this_shell_function; | |
255 | ||
256 | /* If non-zero, matches in case and [[ ... ]] are case-insensitive */ | |
257 | int match_ignore_case = 0; | |
258 | ||
259 | int executing_command_builtin = 0; | |
260 | ||
261 | struct stat SB; /* used for debugging */ | |
262 | ||
263 | static int special_builtin_failed; | |
264 | ||
265 | static COMMAND *currently_executing_command; | |
266 | ||
267 | /* The line number that the currently executing function starts on. */ | |
268 | static int function_line_number; | |
269 | ||
270 | /* XXX - set to 1 if we're running the DEBUG trap and we want to show the line | |
271 | number containing the function name. Used by executing_line_number to | |
272 | report the correct line number. Kind of a hack. */ | |
273 | static int showing_function_line; | |
274 | ||
275 | static int line_number_for_err_trap; | |
276 | ||
277 | /* A sort of function nesting level counter */ | |
278 | int funcnest = 0; | |
279 | int funcnest_max = 0; /* XXX - bash-4.2 */ | |
280 | ||
281 | int lastpipe_opt = 0; | |
282 | ||
283 | struct fd_bitmap *current_fds_to_close = (struct fd_bitmap *)NULL; | |
284 | ||
285 | #define FD_BITMAP_DEFAULT_SIZE 32 | |
286 | ||
287 | /* Functions to allocate and deallocate the structures used to pass | |
288 | information from the shell to its children about file descriptors | |
289 | to close. */ | |
290 | struct fd_bitmap * | |
291 | new_fd_bitmap (size) | |
292 | int size; | |
293 | { | |
294 | struct fd_bitmap *ret; | |
295 | ||
296 | ret = (struct fd_bitmap *)xmalloc (sizeof (struct fd_bitmap)); | |
297 | ||
298 | ret->size = size; | |
299 | ||
300 | if (size) | |
301 | { | |
302 | ret->bitmap = (char *)xmalloc (size); | |
303 | memset (ret->bitmap, '\0', size); | |
304 | } | |
305 | else | |
306 | ret->bitmap = (char *)NULL; | |
307 | return (ret); | |
308 | } | |
309 | ||
310 | void | |
311 | dispose_fd_bitmap (fdbp) | |
312 | struct fd_bitmap *fdbp; | |
313 | { | |
314 | FREE (fdbp->bitmap); | |
315 | free (fdbp); | |
316 | } | |
317 | ||
318 | void | |
319 | close_fd_bitmap (fdbp) | |
320 | struct fd_bitmap *fdbp; | |
321 | { | |
322 | register int i; | |
323 | ||
324 | if (fdbp) | |
325 | { | |
326 | for (i = 0; i < fdbp->size; i++) | |
327 | if (fdbp->bitmap[i]) | |
328 | { | |
329 | close (i); | |
330 | fdbp->bitmap[i] = 0; | |
331 | } | |
332 | } | |
333 | } | |
334 | ||
335 | /* Return the line number of the currently executing command. */ | |
336 | int | |
337 | executing_line_number () | |
338 | { | |
339 | if (executing && showing_function_line == 0 && | |
340 | (variable_context == 0 || interactive_shell == 0) && | |
341 | currently_executing_command) | |
342 | { | |
343 | #if defined (COND_COMMAND) | |
344 | if (currently_executing_command->type == cm_cond) | |
345 | return currently_executing_command->value.Cond->line; | |
346 | #endif | |
347 | #if defined (DPAREN_ARITHMETIC) | |
348 | else if (currently_executing_command->type == cm_arith) | |
349 | return currently_executing_command->value.Arith->line; | |
350 | #endif | |
351 | #if defined (ARITH_FOR_COMMAND) | |
352 | else if (currently_executing_command->type == cm_arith_for) | |
353 | return currently_executing_command->value.ArithFor->line; | |
354 | #endif | |
355 | ||
356 | return line_number; | |
357 | } | |
358 | else | |
359 | return line_number; | |
360 | } | |
361 | ||
362 | /* Execute the command passed in COMMAND. COMMAND is exactly what | |
363 | read_command () places into GLOBAL_COMMAND. See "command.h" for the | |
364 | details of the command structure. | |
365 | ||
366 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
367 | return values. Executing a command with nothing in it returns | |
368 | EXECUTION_SUCCESS. */ | |
369 | int | |
370 | execute_command (command) | |
371 | COMMAND *command; | |
372 | { | |
373 | struct fd_bitmap *bitmap; | |
374 | int result; | |
375 | ||
376 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
377 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
378 | begin_unwind_frame ("execute-command"); | |
379 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
380 | ||
381 | /* Just do the command, but not asynchronously. */ | |
382 | result = execute_command_internal (command, 0, NO_PIPE, NO_PIPE, bitmap); | |
383 | ||
384 | dispose_fd_bitmap (bitmap); | |
385 | discard_unwind_frame ("execute-command"); | |
386 | ||
387 | #if defined (PROCESS_SUBSTITUTION) | |
388 | /* don't unlink fifos if we're in a shell function; wait until the function | |
389 | returns. */ | |
390 | if (variable_context == 0) | |
391 | unlink_fifo_list (); | |
392 | #endif /* PROCESS_SUBSTITUTION */ | |
393 | ||
394 | QUIT; | |
395 | return (result); | |
396 | } | |
397 | ||
398 | /* Return 1 if TYPE is a shell control structure type. */ | |
399 | static int | |
400 | shell_control_structure (type) | |
401 | enum command_type type; | |
402 | { | |
403 | switch (type) | |
404 | { | |
405 | #if defined (ARITH_FOR_COMMAND) | |
406 | case cm_arith_for: | |
407 | #endif | |
408 | #if defined (SELECT_COMMAND) | |
409 | case cm_select: | |
410 | #endif | |
411 | #if defined (DPAREN_ARITHMETIC) | |
412 | case cm_arith: | |
413 | #endif | |
414 | #if defined (COND_COMMAND) | |
415 | case cm_cond: | |
416 | #endif | |
417 | case cm_case: | |
418 | case cm_while: | |
419 | case cm_until: | |
420 | case cm_if: | |
421 | case cm_for: | |
422 | case cm_group: | |
423 | case cm_function_def: | |
424 | return (1); | |
425 | ||
426 | default: | |
427 | return (0); | |
428 | } | |
429 | } | |
430 | ||
431 | /* A function to use to unwind_protect the redirection undo list | |
432 | for loops. */ | |
433 | static void | |
434 | cleanup_redirects (list) | |
435 | REDIRECT *list; | |
436 | { | |
437 | do_redirections (list, RX_ACTIVE); | |
438 | dispose_redirects (list); | |
439 | } | |
440 | ||
441 | #if 0 | |
442 | /* Function to unwind_protect the redirections for functions and builtins. */ | |
443 | static void | |
444 | cleanup_func_redirects (list) | |
445 | REDIRECT *list; | |
446 | { | |
447 | do_redirections (list, RX_ACTIVE); | |
448 | } | |
449 | #endif | |
450 | ||
451 | void | |
452 | dispose_exec_redirects () | |
453 | { | |
454 | if (exec_redirection_undo_list) | |
455 | { | |
456 | dispose_redirects (exec_redirection_undo_list); | |
457 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
458 | } | |
459 | } | |
460 | ||
461 | #if defined (JOB_CONTROL) | |
462 | /* A function to restore the signal mask to its proper value when the shell | |
463 | is interrupted or errors occur while creating a pipeline. */ | |
464 | static int | |
465 | restore_signal_mask (set) | |
466 | sigset_t *set; | |
467 | { | |
468 | return (sigprocmask (SIG_SETMASK, set, (sigset_t *)NULL)); | |
469 | } | |
470 | #endif /* JOB_CONTROL */ | |
471 | ||
472 | #ifdef DEBUG | |
473 | /* A debugging function that can be called from gdb, for instance. */ | |
474 | void | |
475 | open_files () | |
476 | { | |
477 | register int i; | |
478 | int f, fd_table_size; | |
479 | ||
480 | fd_table_size = getdtablesize (); | |
481 | ||
482 | fprintf (stderr, "pid %ld open files:", (long)getpid ()); | |
483 | for (i = 3; i < fd_table_size; i++) | |
484 | { | |
485 | if ((f = fcntl (i, F_GETFD, 0)) != -1) | |
486 | fprintf (stderr, " %d (%s)", i, f ? "close" : "open"); | |
487 | } | |
488 | fprintf (stderr, "\n"); | |
489 | } | |
490 | #endif | |
491 | ||
492 | static void | |
493 | async_redirect_stdin () | |
494 | { | |
495 | int fd; | |
496 | ||
497 | fd = open ("/dev/null", O_RDONLY); | |
498 | if (fd > 0) | |
499 | { | |
500 | dup2 (fd, 0); | |
501 | close (fd); | |
502 | } | |
503 | else if (fd < 0) | |
504 | internal_error (_("cannot redirect standard input from /dev/null: %s"), strerror (errno)); | |
505 | } | |
506 | ||
507 | #define DESCRIBE_PID(pid) do { if (interactive) describe_pid (pid); } while (0) | |
508 | ||
509 | /* Execute the command passed in COMMAND, perhaps doing it asynchrounously. | |
510 | COMMAND is exactly what read_command () places into GLOBAL_COMMAND. | |
511 | ASYNCHROUNOUS, if non-zero, says to do this command in the background. | |
512 | PIPE_IN and PIPE_OUT are file descriptors saying where input comes | |
513 | from and where it goes. They can have the value of NO_PIPE, which means | |
514 | I/O is stdin/stdout. | |
515 | FDS_TO_CLOSE is a list of file descriptors to close once the child has | |
516 | been forked. This list often contains the unusable sides of pipes, etc. | |
517 | ||
518 | EXECUTION_SUCCESS or EXECUTION_FAILURE are the only possible | |
519 | return values. Executing a command with nothing in it returns | |
520 | EXECUTION_SUCCESS. */ | |
521 | int | |
522 | execute_command_internal (command, asynchronous, pipe_in, pipe_out, | |
523 | fds_to_close) | |
524 | COMMAND *command; | |
525 | int asynchronous; | |
526 | int pipe_in, pipe_out; | |
527 | struct fd_bitmap *fds_to_close; | |
528 | { | |
529 | int exec_result, user_subshell, invert, ignore_return, was_error_trap; | |
530 | REDIRECT *my_undo_list, *exec_undo_list; | |
531 | volatile int last_pid; | |
532 | volatile int save_line_number; | |
631b20c6 CR |
533 | #if defined (PROCESS_SUBSTITUTION) |
534 | volatile int ofifo, nfifo, osize, saved_fifo; | |
535 | volatile char *ofifo_list; | |
536 | #endif | |
19baff85 CR |
537 | |
538 | #if 0 | |
539 | if (command == 0 || breaking || continuing || read_but_dont_execute) | |
540 | return (EXECUTION_SUCCESS); | |
541 | #else | |
542 | if (breaking || continuing) | |
543 | return (last_command_exit_value); | |
544 | if (command == 0 || read_but_dont_execute) | |
545 | return (EXECUTION_SUCCESS); | |
546 | #endif | |
547 | ||
548 | QUIT; | |
549 | run_pending_traps (); | |
550 | ||
551 | #if 0 | |
552 | if (running_trap == 0) | |
553 | #endif | |
554 | currently_executing_command = command; | |
555 | ||
556 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
557 | ||
558 | /* If we're inverting the return value and `set -e' has been executed, | |
559 | we don't want a failing command to inadvertently cause the shell | |
560 | to exit. */ | |
561 | if (exit_immediately_on_error && invert) /* XXX */ | |
562 | command->flags |= CMD_IGNORE_RETURN; /* XXX */ | |
563 | ||
564 | exec_result = EXECUTION_SUCCESS; | |
565 | ||
566 | /* If a command was being explicitly run in a subshell, or if it is | |
567 | a shell control-structure, and it has a pipe, then we do the command | |
568 | in a subshell. */ | |
569 | if (command->type == cm_subshell && (command->flags & CMD_NO_FORK)) | |
570 | return (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); | |
571 | ||
572 | #if defined (COPROCESS_SUPPORT) | |
573 | if (command->type == cm_coproc) | |
574 | return (execute_coproc (command, pipe_in, pipe_out, fds_to_close)); | |
575 | #endif | |
576 | ||
577 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); | |
578 | ||
579 | if (command->type == cm_subshell || | |
580 | (command->flags & (CMD_WANT_SUBSHELL|CMD_FORCE_SUBSHELL)) || | |
581 | (shell_control_structure (command->type) && | |
582 | (pipe_out != NO_PIPE || pipe_in != NO_PIPE || asynchronous))) | |
583 | { | |
584 | pid_t paren_pid; | |
585 | ||
586 | /* Fork a subshell, turn off the subshell bit, turn off job | |
587 | control and call execute_command () on the command again. */ | |
588 | line_number_for_err_trap = line_number; | |
589 | paren_pid = make_child (savestring (make_command_string (command)), | |
590 | asynchronous); | |
591 | if (paren_pid == 0) | |
592 | exit (execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close)); | |
593 | /* NOTREACHED */ | |
594 | else | |
595 | { | |
596 | close_pipes (pipe_in, pipe_out); | |
597 | ||
598 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
122f603c CR |
599 | if (variable_context == 0) /* wait until shell function completes */ |
600 | unlink_fifo_list (); | |
19baff85 CR |
601 | #endif |
602 | /* If we are part of a pipeline, and not the end of the pipeline, | |
603 | then we should simply return and let the last command in the | |
604 | pipe be waited for. If we are not in a pipeline, or are the | |
605 | last command in the pipeline, then we wait for the subshell | |
606 | and return its exit status as usual. */ | |
607 | if (pipe_out != NO_PIPE) | |
608 | return (EXECUTION_SUCCESS); | |
609 | ||
610 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
611 | ||
612 | if (asynchronous == 0) | |
613 | { | |
614 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; | |
615 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
616 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
617 | ||
618 | exec_result = wait_for (paren_pid); | |
619 | ||
620 | /* If we have to, invert the return value. */ | |
621 | if (invert) | |
622 | exec_result = ((exec_result == EXECUTION_SUCCESS) | |
623 | ? EXECUTION_FAILURE | |
624 | : EXECUTION_SUCCESS); | |
625 | ||
626 | last_command_exit_value = exec_result; | |
627 | if (user_subshell && was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
628 | { | |
629 | save_line_number = line_number; | |
630 | line_number = line_number_for_err_trap; | |
631 | run_error_trap (); | |
632 | line_number = save_line_number; | |
633 | } | |
634 | ||
635 | if (user_subshell && ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
636 | { | |
637 | run_pending_traps (); | |
638 | jump_to_top_level (ERREXIT); | |
639 | } | |
640 | ||
641 | return (last_command_exit_value); | |
642 | } | |
643 | else | |
644 | { | |
645 | DESCRIBE_PID (paren_pid); | |
646 | ||
647 | run_pending_traps (); | |
648 | ||
649 | return (EXECUTION_SUCCESS); | |
650 | } | |
651 | } | |
652 | } | |
653 | ||
654 | #if defined (COMMAND_TIMING) | |
655 | if (command->flags & CMD_TIME_PIPELINE) | |
656 | { | |
657 | if (asynchronous) | |
658 | { | |
659 | command->flags |= CMD_FORCE_SUBSHELL; | |
660 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
661 | } | |
662 | else | |
663 | { | |
664 | exec_result = time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
665 | #if 0 | |
666 | if (running_trap == 0) | |
667 | #endif | |
668 | currently_executing_command = (COMMAND *)NULL; | |
669 | } | |
670 | return (exec_result); | |
671 | } | |
672 | #endif /* COMMAND_TIMING */ | |
673 | ||
674 | if (shell_control_structure (command->type) && command->redirects) | |
675 | stdin_redir = stdin_redirects (command->redirects); | |
676 | ||
631b20c6 CR |
677 | #if defined (PROCESS_SUBSTITUTION) |
678 | if (variable_context != 0) | |
679 | { | |
680 | ofifo = num_fifos (); | |
681 | ofifo_list = copy_fifo_list (&osize); | |
682 | saved_fifo = 1; | |
683 | } | |
684 | else | |
685 | saved_fifo = 0; | |
686 | #endif | |
687 | ||
19baff85 CR |
688 | /* Handle WHILE FOR CASE etc. with redirections. (Also '&' input |
689 | redirection.) */ | |
690 | if (do_redirections (command->redirects, RX_ACTIVE|RX_UNDOABLE) != 0) | |
691 | { | |
692 | cleanup_redirects (redirection_undo_list); | |
693 | redirection_undo_list = (REDIRECT *)NULL; | |
694 | dispose_exec_redirects (); | |
631b20c6 CR |
695 | #if defined (PROCESS_SUBSTITUTION) |
696 | free (ofifo_list); | |
697 | #endif | |
19baff85 CR |
698 | return (last_command_exit_value = EXECUTION_FAILURE); |
699 | } | |
700 | ||
701 | if (redirection_undo_list) | |
702 | { | |
703 | /* XXX - why copy here? */ | |
704 | my_undo_list = (REDIRECT *)copy_redirects (redirection_undo_list); | |
705 | dispose_redirects (redirection_undo_list); | |
706 | redirection_undo_list = (REDIRECT *)NULL; | |
707 | } | |
708 | else | |
709 | my_undo_list = (REDIRECT *)NULL; | |
710 | ||
711 | if (exec_redirection_undo_list) | |
712 | { | |
713 | /* XXX - why copy here? */ | |
714 | exec_undo_list = (REDIRECT *)copy_redirects (exec_redirection_undo_list); | |
715 | dispose_redirects (exec_redirection_undo_list); | |
716 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
717 | } | |
718 | else | |
719 | exec_undo_list = (REDIRECT *)NULL; | |
720 | ||
721 | if (my_undo_list || exec_undo_list) | |
722 | begin_unwind_frame ("loop_redirections"); | |
723 | ||
724 | if (my_undo_list) | |
725 | add_unwind_protect ((Function *)cleanup_redirects, my_undo_list); | |
726 | ||
727 | if (exec_undo_list) | |
728 | add_unwind_protect ((Function *)dispose_redirects, exec_undo_list); | |
729 | ||
730 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
731 | ||
732 | QUIT; | |
733 | ||
734 | switch (command->type) | |
735 | { | |
736 | case cm_simple: | |
737 | { | |
738 | save_line_number = line_number; | |
739 | /* We can't rely on variables retaining their values across a | |
740 | call to execute_simple_command if a longjmp occurs as the | |
741 | result of a `return' builtin. This is true for sure with gcc. */ | |
742 | #if defined (RECYCLES_PIDS) | |
743 | last_made_pid = NO_PID; | |
744 | #endif | |
745 | last_pid = last_made_pid; | |
746 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; | |
747 | ||
748 | if (ignore_return && command->value.Simple) | |
749 | command->value.Simple->flags |= CMD_IGNORE_RETURN; | |
750 | if (command->flags & CMD_STDIN_REDIR) | |
751 | command->value.Simple->flags |= CMD_STDIN_REDIR; | |
752 | ||
753 | line_number_for_err_trap = line_number = command->value.Simple->line; | |
754 | exec_result = | |
755 | execute_simple_command (command->value.Simple, pipe_in, pipe_out, | |
756 | asynchronous, fds_to_close); | |
757 | line_number = save_line_number; | |
758 | ||
759 | /* The temporary environment should be used for only the simple | |
760 | command immediately following its definition. */ | |
761 | dispose_used_env_vars (); | |
762 | ||
763 | #if (defined (ultrix) && defined (mips)) || defined (C_ALLOCA) | |
764 | /* Reclaim memory allocated with alloca () on machines which | |
765 | may be using the alloca emulation code. */ | |
766 | (void) alloca (0); | |
767 | #endif /* (ultrix && mips) || C_ALLOCA */ | |
768 | ||
769 | /* If we forked to do the command, then we must wait_for () | |
770 | the child. */ | |
771 | ||
772 | /* XXX - this is something to watch out for if there are problems | |
773 | when the shell is compiled without job control. */ | |
774 | if (already_making_children && pipe_out == NO_PIPE && | |
775 | last_made_pid != last_pid) | |
776 | { | |
777 | stop_pipeline (asynchronous, (COMMAND *)NULL); | |
778 | ||
779 | if (asynchronous) | |
780 | { | |
781 | DESCRIBE_PID (last_made_pid); | |
782 | } | |
783 | else | |
784 | #if !defined (JOB_CONTROL) | |
785 | /* Do not wait for asynchronous processes started from | |
786 | startup files. */ | |
787 | if (last_made_pid != last_asynchronous_pid) | |
788 | #endif | |
789 | /* When executing a shell function that executes other | |
790 | commands, this causes the last simple command in | |
791 | the function to be waited for twice. This also causes | |
792 | subshells forked to execute builtin commands (e.g., in | |
793 | pipelines) to be waited for twice. */ | |
794 | exec_result = wait_for (last_made_pid); | |
795 | } | |
796 | } | |
797 | ||
798 | /* 2009/02/13 -- pipeline failure is processed elsewhere. This handles | |
799 | only the failure of a simple command. */ | |
800 | if (was_error_trap && ignore_return == 0 && invert == 0 && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS) | |
801 | { | |
802 | last_command_exit_value = exec_result; | |
803 | line_number = line_number_for_err_trap; | |
804 | run_error_trap (); | |
805 | line_number = save_line_number; | |
806 | } | |
807 | ||
808 | if (ignore_return == 0 && invert == 0 && | |
809 | ((posixly_correct && interactive == 0 && special_builtin_failed) || | |
810 | (exit_immediately_on_error && pipe_in == NO_PIPE && pipe_out == NO_PIPE && exec_result != EXECUTION_SUCCESS))) | |
811 | { | |
812 | last_command_exit_value = exec_result; | |
813 | run_pending_traps (); | |
814 | jump_to_top_level (ERREXIT); | |
815 | } | |
816 | ||
817 | break; | |
818 | ||
819 | case cm_for: | |
820 | if (ignore_return) | |
821 | command->value.For->flags |= CMD_IGNORE_RETURN; | |
822 | exec_result = execute_for_command (command->value.For); | |
823 | break; | |
824 | ||
825 | #if defined (ARITH_FOR_COMMAND) | |
826 | case cm_arith_for: | |
827 | if (ignore_return) | |
828 | command->value.ArithFor->flags |= CMD_IGNORE_RETURN; | |
829 | exec_result = execute_arith_for_command (command->value.ArithFor); | |
830 | break; | |
831 | #endif | |
832 | ||
833 | #if defined (SELECT_COMMAND) | |
834 | case cm_select: | |
835 | if (ignore_return) | |
836 | command->value.Select->flags |= CMD_IGNORE_RETURN; | |
837 | exec_result = execute_select_command (command->value.Select); | |
838 | break; | |
839 | #endif | |
840 | ||
841 | case cm_case: | |
842 | if (ignore_return) | |
843 | command->value.Case->flags |= CMD_IGNORE_RETURN; | |
844 | exec_result = execute_case_command (command->value.Case); | |
845 | break; | |
846 | ||
847 | case cm_while: | |
848 | if (ignore_return) | |
849 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
850 | exec_result = execute_while_command (command->value.While); | |
851 | break; | |
852 | ||
853 | case cm_until: | |
854 | if (ignore_return) | |
855 | command->value.While->flags |= CMD_IGNORE_RETURN; | |
856 | exec_result = execute_until_command (command->value.While); | |
857 | break; | |
858 | ||
859 | case cm_if: | |
860 | if (ignore_return) | |
861 | command->value.If->flags |= CMD_IGNORE_RETURN; | |
862 | exec_result = execute_if_command (command->value.If); | |
863 | break; | |
864 | ||
865 | case cm_group: | |
866 | ||
867 | /* This code can be executed from either of two paths: an explicit | |
868 | '{}' command, or via a function call. If we are executed via a | |
869 | function call, we have already taken care of the function being | |
870 | executed in the background (down there in execute_simple_command ()), | |
871 | and this command should *not* be marked as asynchronous. If we | |
872 | are executing a regular '{}' group command, and asynchronous == 1, | |
873 | we must want to execute the whole command in the background, so we | |
874 | need a subshell, and we want the stuff executed in that subshell | |
875 | (this group command) to be executed in the foreground of that | |
876 | subshell (i.e. there will not be *another* subshell forked). | |
877 | ||
878 | What we do is to force a subshell if asynchronous, and then call | |
879 | execute_command_internal again with asynchronous still set to 1, | |
880 | but with the original group command, so the printed command will | |
881 | look right. | |
882 | ||
883 | The code above that handles forking off subshells will note that | |
884 | both subshell and async are on, and turn off async in the child | |
885 | after forking the subshell (but leave async set in the parent, so | |
886 | the normal call to describe_pid is made). This turning off | |
887 | async is *crucial*; if it is not done, this will fall into an | |
888 | infinite loop of executions through this spot in subshell after | |
889 | subshell until the process limit is exhausted. */ | |
890 | ||
891 | if (asynchronous) | |
892 | { | |
893 | command->flags |= CMD_FORCE_SUBSHELL; | |
894 | exec_result = | |
895 | execute_command_internal (command, 1, pipe_in, pipe_out, | |
896 | fds_to_close); | |
897 | } | |
898 | else | |
899 | { | |
900 | if (ignore_return && command->value.Group->command) | |
901 | command->value.Group->command->flags |= CMD_IGNORE_RETURN; | |
902 | exec_result = | |
903 | execute_command_internal (command->value.Group->command, | |
904 | asynchronous, pipe_in, pipe_out, | |
905 | fds_to_close); | |
906 | } | |
907 | break; | |
908 | ||
909 | case cm_connection: | |
910 | exec_result = execute_connection (command, asynchronous, | |
911 | pipe_in, pipe_out, fds_to_close); | |
912 | break; | |
913 | ||
914 | #if defined (DPAREN_ARITHMETIC) | |
915 | case cm_arith: | |
916 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; | |
917 | if (ignore_return) | |
918 | command->value.Arith->flags |= CMD_IGNORE_RETURN; | |
919 | line_number_for_err_trap = save_line_number = line_number; | |
920 | exec_result = execute_arith_command (command->value.Arith); | |
921 | line_number = save_line_number; | |
922 | ||
923 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
924 | { | |
925 | last_command_exit_value = exec_result; | |
926 | save_line_number = line_number; | |
927 | line_number = line_number_for_err_trap; | |
928 | run_error_trap (); | |
929 | line_number = save_line_number; | |
930 | } | |
931 | ||
932 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
933 | { | |
934 | last_command_exit_value = exec_result; | |
935 | run_pending_traps (); | |
936 | jump_to_top_level (ERREXIT); | |
937 | } | |
938 | ||
939 | break; | |
940 | #endif | |
941 | ||
942 | #if defined (COND_COMMAND) | |
943 | case cm_cond: | |
944 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; | |
945 | if (ignore_return) | |
946 | command->value.Cond->flags |= CMD_IGNORE_RETURN; | |
947 | ||
948 | line_number_for_err_trap = save_line_number = line_number; | |
949 | exec_result = execute_cond_command (command->value.Cond); | |
950 | line_number = save_line_number; | |
951 | ||
952 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
953 | { | |
954 | last_command_exit_value = exec_result; | |
955 | save_line_number = line_number; | |
956 | line_number = line_number_for_err_trap; | |
957 | run_error_trap (); | |
958 | line_number = save_line_number; | |
959 | } | |
960 | ||
961 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
962 | { | |
963 | last_command_exit_value = exec_result; | |
964 | run_pending_traps (); | |
965 | jump_to_top_level (ERREXIT); | |
966 | } | |
967 | ||
968 | break; | |
969 | #endif | |
970 | ||
971 | case cm_function_def: | |
972 | exec_result = execute_intern_function (command->value.Function_def->name, | |
973 | command->value.Function_def->command); | |
974 | break; | |
975 | ||
976 | default: | |
977 | command_error ("execute_command", CMDERR_BADTYPE, command->type, 0); | |
978 | } | |
979 | ||
980 | if (my_undo_list) | |
981 | { | |
982 | do_redirections (my_undo_list, RX_ACTIVE); | |
983 | dispose_redirects (my_undo_list); | |
984 | } | |
985 | ||
986 | if (exec_undo_list) | |
987 | dispose_redirects (exec_undo_list); | |
988 | ||
989 | if (my_undo_list || exec_undo_list) | |
990 | discard_unwind_frame ("loop_redirections"); | |
991 | ||
631b20c6 CR |
992 | #if defined (PROCESS_SUBSTITUTION) |
993 | if (saved_fifo) | |
994 | { | |
995 | nfifo = num_fifos (); | |
996 | if (nfifo > ofifo) | |
997 | close_new_fifos (ofifo_list, osize); | |
998 | free (ofifo_list); | |
999 | } | |
1000 | #endif | |
1001 | ||
19baff85 CR |
1002 | /* Invert the return value if we have to */ |
1003 | if (invert) | |
1004 | exec_result = (exec_result == EXECUTION_SUCCESS) | |
1005 | ? EXECUTION_FAILURE | |
1006 | : EXECUTION_SUCCESS; | |
1007 | ||
1008 | #if defined (DPAREN_ARITHMETIC) || defined (COND_COMMAND) | |
1009 | /* This is where we set PIPESTATUS from the exit status of the appropriate | |
1010 | compound commands (the ones that look enough like simple commands to | |
1011 | cause confusion). We might be able to optimize by not doing this if | |
1012 | subshell_environment != 0. */ | |
1013 | switch (command->type) | |
1014 | { | |
1015 | # if defined (DPAREN_ARITHMETIC) | |
1016 | case cm_arith: | |
1017 | # endif | |
1018 | # if defined (COND_COMMAND) | |
1019 | case cm_cond: | |
1020 | # endif | |
1021 | set_pipestatus_from_exit (exec_result); | |
1022 | break; | |
1023 | } | |
1024 | #endif | |
1025 | ||
1026 | last_command_exit_value = exec_result; | |
1027 | run_pending_traps (); | |
1028 | #if 0 | |
1029 | if (running_trap == 0) | |
1030 | #endif | |
1031 | currently_executing_command = (COMMAND *)NULL; | |
631b20c6 | 1032 | |
19baff85 CR |
1033 | return (last_command_exit_value); |
1034 | } | |
1035 | ||
1036 | #if defined (COMMAND_TIMING) | |
1037 | ||
1038 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1039 | extern struct timeval *difftimeval __P((struct timeval *, struct timeval *, struct timeval *)); | |
1040 | extern struct timeval *addtimeval __P((struct timeval *, struct timeval *, struct timeval *)); | |
1041 | extern int timeval_to_cpu __P((struct timeval *, struct timeval *, struct timeval *)); | |
1042 | #endif | |
1043 | ||
1044 | #define POSIX_TIMEFORMAT "real %2R\nuser %2U\nsys %2S" | |
1045 | #define BASH_TIMEFORMAT "\nreal\t%3lR\nuser\t%3lU\nsys\t%3lS" | |
1046 | ||
1047 | static const int precs[] = { 0, 100, 10, 1 }; | |
1048 | ||
1049 | /* Expand one `%'-prefixed escape sequence from a time format string. */ | |
1050 | static int | |
1051 | mkfmt (buf, prec, lng, sec, sec_fraction) | |
1052 | char *buf; | |
1053 | int prec, lng; | |
1054 | time_t sec; | |
1055 | int sec_fraction; | |
1056 | { | |
1057 | time_t min; | |
1058 | char abuf[INT_STRLEN_BOUND(time_t) + 1]; | |
1059 | int ind, aind; | |
1060 | ||
1061 | ind = 0; | |
1062 | abuf[sizeof(abuf) - 1] = '\0'; | |
1063 | ||
1064 | /* If LNG is non-zero, we want to decompose SEC into minutes and seconds. */ | |
1065 | if (lng) | |
1066 | { | |
1067 | min = sec / 60; | |
1068 | sec %= 60; | |
1069 | aind = sizeof(abuf) - 2; | |
1070 | do | |
1071 | abuf[aind--] = (min % 10) + '0'; | |
1072 | while (min /= 10); | |
1073 | aind++; | |
1074 | while (abuf[aind]) | |
1075 | buf[ind++] = abuf[aind++]; | |
1076 | buf[ind++] = 'm'; | |
1077 | } | |
1078 | ||
1079 | /* Now add the seconds. */ | |
1080 | aind = sizeof (abuf) - 2; | |
1081 | do | |
1082 | abuf[aind--] = (sec % 10) + '0'; | |
1083 | while (sec /= 10); | |
1084 | aind++; | |
1085 | while (abuf[aind]) | |
1086 | buf[ind++] = abuf[aind++]; | |
1087 | ||
1088 | /* We want to add a decimal point and PREC places after it if PREC is | |
1089 | nonzero. PREC is not greater than 3. SEC_FRACTION is between 0 | |
1090 | and 999. */ | |
1091 | if (prec != 0) | |
1092 | { | |
1093 | buf[ind++] = '.'; | |
1094 | for (aind = 1; aind <= prec; aind++) | |
1095 | { | |
1096 | buf[ind++] = (sec_fraction / precs[aind]) + '0'; | |
1097 | sec_fraction %= precs[aind]; | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | if (lng) | |
1102 | buf[ind++] = 's'; | |
1103 | buf[ind] = '\0'; | |
1104 | ||
1105 | return (ind); | |
1106 | } | |
1107 | ||
1108 | /* Interpret the format string FORMAT, interpolating the following escape | |
1109 | sequences: | |
1110 | %[prec][l][RUS] | |
1111 | ||
1112 | where the optional `prec' is a precision, meaning the number of | |
1113 | characters after the decimal point, the optional `l' means to format | |
1114 | using minutes and seconds (MMmNN[.FF]s), like the `times' builtin', | |
1115 | and the last character is one of | |
1116 | ||
1117 | R number of seconds of `real' time | |
1118 | U number of seconds of `user' time | |
1119 | S number of seconds of `system' time | |
1120 | ||
1121 | An occurrence of `%%' in the format string is translated to a `%'. The | |
1122 | result is printed to FP, a pointer to a FILE. The other variables are | |
1123 | the seconds and thousandths of a second of real, user, and system time, | |
1124 | resectively. */ | |
1125 | static void | |
1126 | print_formatted_time (fp, format, rs, rsf, us, usf, ss, ssf, cpu) | |
1127 | FILE *fp; | |
1128 | char *format; | |
1129 | time_t rs; | |
1130 | int rsf; | |
1131 | time_t us; | |
1132 | int usf; | |
1133 | time_t ss; | |
1134 | int ssf, cpu; | |
1135 | { | |
1136 | int prec, lng, len; | |
1137 | char *str, *s, ts[INT_STRLEN_BOUND (time_t) + sizeof ("mSS.FFFF")]; | |
1138 | time_t sum; | |
1139 | int sum_frac; | |
1140 | int sindex, ssize; | |
1141 | ||
1142 | len = strlen (format); | |
1143 | ssize = (len + 64) - (len % 64); | |
1144 | str = (char *)xmalloc (ssize); | |
1145 | sindex = 0; | |
1146 | ||
1147 | for (s = format; *s; s++) | |
1148 | { | |
1149 | if (*s != '%' || s[1] == '\0') | |
1150 | { | |
1151 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1152 | str[sindex++] = *s; | |
1153 | } | |
1154 | else if (s[1] == '%') | |
1155 | { | |
1156 | s++; | |
1157 | RESIZE_MALLOCED_BUFFER (str, sindex, 1, ssize, 64); | |
1158 | str[sindex++] = *s; | |
1159 | } | |
1160 | else if (s[1] == 'P') | |
1161 | { | |
1162 | s++; | |
1163 | #if 0 | |
1164 | /* clamp CPU usage at 100% */ | |
1165 | if (cpu > 10000) | |
1166 | cpu = 10000; | |
1167 | #endif | |
1168 | sum = cpu / 100; | |
1169 | sum_frac = (cpu % 100) * 10; | |
1170 | len = mkfmt (ts, 2, 0, sum, sum_frac); | |
1171 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1172 | strcpy (str + sindex, ts); | |
1173 | sindex += len; | |
1174 | } | |
1175 | else | |
1176 | { | |
1177 | prec = 3; /* default is three places past the decimal point. */ | |
1178 | lng = 0; /* default is to not use minutes or append `s' */ | |
1179 | s++; | |
1180 | if (DIGIT (*s)) /* `precision' */ | |
1181 | { | |
1182 | prec = *s++ - '0'; | |
1183 | if (prec > 3) prec = 3; | |
1184 | } | |
1185 | if (*s == 'l') /* `length extender' */ | |
1186 | { | |
1187 | lng = 1; | |
1188 | s++; | |
1189 | } | |
1190 | if (*s == 'R' || *s == 'E') | |
1191 | len = mkfmt (ts, prec, lng, rs, rsf); | |
1192 | else if (*s == 'U') | |
1193 | len = mkfmt (ts, prec, lng, us, usf); | |
1194 | else if (*s == 'S') | |
1195 | len = mkfmt (ts, prec, lng, ss, ssf); | |
1196 | else | |
1197 | { | |
1198 | internal_error (_("TIMEFORMAT: `%c': invalid format character"), *s); | |
1199 | free (str); | |
1200 | return; | |
1201 | } | |
1202 | RESIZE_MALLOCED_BUFFER (str, sindex, len, ssize, 64); | |
1203 | strcpy (str + sindex, ts); | |
1204 | sindex += len; | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | str[sindex] = '\0'; | |
1209 | fprintf (fp, "%s\n", str); | |
1210 | fflush (fp); | |
1211 | ||
1212 | free (str); | |
1213 | } | |
1214 | ||
1215 | static int | |
1216 | time_command (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1217 | COMMAND *command; | |
1218 | int asynchronous, pipe_in, pipe_out; | |
1219 | struct fd_bitmap *fds_to_close; | |
1220 | { | |
1221 | int rv, posix_time, old_flags, nullcmd; | |
1222 | time_t rs, us, ss; | |
1223 | int rsf, usf, ssf; | |
1224 | int cpu; | |
1225 | char *time_format; | |
1226 | ||
1227 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1228 | struct timeval real, user, sys; | |
1229 | struct timeval before, after; | |
1230 | # if defined (HAVE_STRUCT_TIMEZONE) | |
1231 | struct timezone dtz; /* posix doesn't define this */ | |
1232 | # endif | |
1233 | struct rusage selfb, selfa, kidsb, kidsa; /* a = after, b = before */ | |
1234 | #else | |
1235 | # if defined (HAVE_TIMES) | |
1236 | clock_t tbefore, tafter, real, user, sys; | |
1237 | struct tms before, after; | |
1238 | # endif | |
1239 | #endif | |
1240 | ||
1241 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1242 | # if defined (HAVE_STRUCT_TIMEZONE) | |
1243 | gettimeofday (&before, &dtz); | |
1244 | # else | |
1245 | gettimeofday (&before, (void *)NULL); | |
1246 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
1247 | getrusage (RUSAGE_SELF, &selfb); | |
1248 | getrusage (RUSAGE_CHILDREN, &kidsb); | |
1249 | #else | |
1250 | # if defined (HAVE_TIMES) | |
1251 | tbefore = times (&before); | |
1252 | # endif | |
1253 | #endif | |
1254 | ||
631b20c6 | 1255 | posix_time = command && (command->flags & CMD_TIME_POSIX); |
19baff85 CR |
1256 | |
1257 | nullcmd = (command == 0) || (command->type == cm_simple && command->value.Simple->words == 0 && command->value.Simple->redirects == 0); | |
1258 | if (posixly_correct && nullcmd) | |
1259 | { | |
1260 | #if defined (HAVE_GETRUSAGE) | |
1261 | selfb.ru_utime.tv_sec = kidsb.ru_utime.tv_sec = selfb.ru_stime.tv_sec = kidsb.ru_stime.tv_sec = 0; | |
1262 | selfb.ru_utime.tv_usec = kidsb.ru_utime.tv_usec = selfb.ru_stime.tv_usec = kidsb.ru_stime.tv_usec = 0; | |
1263 | before.tv_sec = shell_start_time; | |
1264 | before.tv_usec = 0; | |
1265 | #else | |
1266 | before.tms_utime = before.tms_stime = before.tms_cutime = before.tms_cstime = 0; | |
1267 | tbefore = shell_start_time; | |
1268 | #endif | |
1269 | } | |
1270 | ||
1271 | old_flags = command->flags; | |
1272 | command->flags &= ~(CMD_TIME_PIPELINE|CMD_TIME_POSIX); | |
1273 | rv = execute_command_internal (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
1274 | command->flags = old_flags; | |
1275 | ||
1276 | rs = us = ss = 0; | |
1277 | rsf = usf = ssf = cpu = 0; | |
1278 | ||
1279 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_GETTIMEOFDAY) | |
1280 | # if defined (HAVE_STRUCT_TIMEZONE) | |
1281 | gettimeofday (&after, &dtz); | |
1282 | # else | |
1283 | gettimeofday (&after, (void *)NULL); | |
1284 | # endif /* !HAVE_STRUCT_TIMEZONE */ | |
1285 | getrusage (RUSAGE_SELF, &selfa); | |
1286 | getrusage (RUSAGE_CHILDREN, &kidsa); | |
1287 | ||
1288 | difftimeval (&real, &before, &after); | |
1289 | timeval_to_secs (&real, &rs, &rsf); | |
1290 | ||
1291 | addtimeval (&user, difftimeval(&after, &selfb.ru_utime, &selfa.ru_utime), | |
1292 | difftimeval(&before, &kidsb.ru_utime, &kidsa.ru_utime)); | |
1293 | timeval_to_secs (&user, &us, &usf); | |
1294 | ||
1295 | addtimeval (&sys, difftimeval(&after, &selfb.ru_stime, &selfa.ru_stime), | |
1296 | difftimeval(&before, &kidsb.ru_stime, &kidsa.ru_stime)); | |
1297 | timeval_to_secs (&sys, &ss, &ssf); | |
1298 | ||
1299 | cpu = timeval_to_cpu (&real, &user, &sys); | |
1300 | #else | |
1301 | # if defined (HAVE_TIMES) | |
1302 | tafter = times (&after); | |
1303 | ||
1304 | real = tafter - tbefore; | |
1305 | clock_t_to_secs (real, &rs, &rsf); | |
1306 | ||
1307 | user = (after.tms_utime - before.tms_utime) + (after.tms_cutime - before.tms_cutime); | |
1308 | clock_t_to_secs (user, &us, &usf); | |
1309 | ||
1310 | sys = (after.tms_stime - before.tms_stime) + (after.tms_cstime - before.tms_cstime); | |
1311 | clock_t_to_secs (sys, &ss, &ssf); | |
1312 | ||
1313 | cpu = (real == 0) ? 0 : ((user + sys) * 10000) / real; | |
1314 | ||
1315 | # else | |
1316 | rs = us = ss = 0; | |
1317 | rsf = usf = ssf = cpu = 0; | |
1318 | # endif | |
1319 | #endif | |
1320 | ||
1321 | if (posix_time) | |
1322 | time_format = POSIX_TIMEFORMAT; | |
1323 | else if ((time_format = get_string_value ("TIMEFORMAT")) == 0) | |
1324 | { | |
1325 | if (posixly_correct && nullcmd) | |
1326 | time_format = "user\t%2lU\nsys\t%2lS"; | |
1327 | else | |
1328 | time_format = BASH_TIMEFORMAT; | |
1329 | } | |
1330 | if (time_format && *time_format) | |
1331 | print_formatted_time (stderr, time_format, rs, rsf, us, usf, ss, ssf, cpu); | |
1332 | ||
1333 | return rv; | |
1334 | } | |
1335 | #endif /* COMMAND_TIMING */ | |
1336 | ||
1337 | /* Execute a command that's supposed to be in a subshell. This must be | |
1338 | called after make_child and we must be running in the child process. | |
1339 | The caller will return or exit() immediately with the value this returns. */ | |
1340 | static int | |
1341 | execute_in_subshell (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
1342 | COMMAND *command; | |
1343 | int asynchronous; | |
1344 | int pipe_in, pipe_out; | |
1345 | struct fd_bitmap *fds_to_close; | |
1346 | { | |
1347 | int user_subshell, return_code, function_value, should_redir_stdin, invert; | |
1348 | int ois, user_coproc; | |
1349 | int result; | |
1350 | volatile COMMAND *tcom; | |
1351 | ||
1352 | USE_VAR(user_subshell); | |
1353 | USE_VAR(user_coproc); | |
1354 | USE_VAR(invert); | |
1355 | USE_VAR(tcom); | |
1356 | USE_VAR(asynchronous); | |
1357 | ||
1358 | subshell_level++; | |
1359 | should_redir_stdin = (asynchronous && (command->flags & CMD_STDIN_REDIR) && | |
1360 | pipe_in == NO_PIPE && | |
1361 | stdin_redirects (command->redirects) == 0); | |
1362 | ||
1363 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
1364 | user_subshell = command->type == cm_subshell || ((command->flags & CMD_WANT_SUBSHELL) != 0); | |
1365 | user_coproc = command->type == cm_coproc; | |
1366 | ||
1367 | command->flags &= ~(CMD_FORCE_SUBSHELL | CMD_WANT_SUBSHELL | CMD_INVERT_RETURN); | |
1368 | ||
1369 | /* If a command is asynchronous in a subshell (like ( foo ) & or | |
1370 | the special case of an asynchronous GROUP command where the | |
1371 | the subshell bit is turned on down in case cm_group: below), | |
1372 | turn off `asynchronous', so that two subshells aren't spawned. | |
1373 | XXX - asynchronous used to be set to 0 in this block, but that | |
1374 | means that setup_async_signals was never run. Now it's set to | |
1375 | 0 after subshell_environment is set appropriately and setup_async_signals | |
1376 | is run. | |
1377 | ||
1378 | This seems semantically correct to me. For example, | |
1379 | ( foo ) & seems to say ``do the command `foo' in a subshell | |
1380 | environment, but don't wait for that subshell to finish'', | |
1381 | and "{ foo ; bar ; } &" seems to me to be like functions or | |
1382 | builtins in the background, which executed in a subshell | |
1383 | environment. I just don't see the need to fork two subshells. */ | |
1384 | ||
1385 | /* Don't fork again, we are already in a subshell. A `doubly | |
1386 | async' shell is not interactive, however. */ | |
1387 | if (asynchronous) | |
1388 | { | |
1389 | #if defined (JOB_CONTROL) | |
1390 | /* If a construct like ( exec xxx yyy ) & is given while job | |
1391 | control is active, we want to prevent exec from putting the | |
1392 | subshell back into the original process group, carefully | |
1393 | undoing all the work we just did in make_child. */ | |
1394 | original_pgrp = -1; | |
1395 | #endif /* JOB_CONTROL */ | |
1396 | ois = interactive_shell; | |
1397 | interactive_shell = 0; | |
1398 | /* This test is to prevent alias expansion by interactive shells that | |
1399 | run `(command) &' but to allow scripts that have enabled alias | |
1400 | expansion with `shopt -s expand_alias' to continue to expand | |
1401 | aliases. */ | |
1402 | if (ois != interactive_shell) | |
1403 | expand_aliases = 0; | |
1404 | } | |
1405 | ||
1406 | /* Subshells are neither login nor interactive. */ | |
1407 | login_shell = interactive = 0; | |
1408 | ||
1409 | if (user_subshell) | |
1410 | subshell_environment = SUBSHELL_PAREN; | |
1411 | else | |
1412 | { | |
1413 | subshell_environment = 0; /* XXX */ | |
1414 | if (asynchronous) | |
1415 | subshell_environment |= SUBSHELL_ASYNC; | |
1416 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
1417 | subshell_environment |= SUBSHELL_PIPE; | |
1418 | if (user_coproc) | |
1419 | subshell_environment |= SUBSHELL_COPROC; | |
1420 | } | |
1421 | ||
1422 | reset_terminating_signals (); /* in sig.c */ | |
1423 | /* Cancel traps, in trap.c. */ | |
1424 | /* Reset the signal handlers in the child, but don't free the | |
1425 | trap strings. Set a flag noting that we have to free the | |
1426 | trap strings if we run trap to change a signal disposition. */ | |
1427 | reset_signal_handlers (); | |
1428 | subshell_environment |= SUBSHELL_RESETTRAP; | |
1429 | ||
1430 | /* Make sure restore_original_signals doesn't undo the work done by | |
1431 | make_child to ensure that asynchronous children are immune to SIGINT | |
1432 | and SIGQUIT. Turn off asynchronous to make sure more subshells are | |
1433 | not spawned. */ | |
1434 | if (asynchronous) | |
1435 | { | |
1436 | setup_async_signals (); | |
1437 | asynchronous = 0; | |
1438 | } | |
1439 | ||
1440 | #if defined (JOB_CONTROL) | |
1441 | set_sigchld_handler (); | |
1442 | #endif /* JOB_CONTROL */ | |
1443 | ||
1444 | set_sigint_handler (); | |
1445 | ||
1446 | #if defined (JOB_CONTROL) | |
1447 | /* Delete all traces that there were any jobs running. This is | |
1448 | only for subshells. */ | |
1449 | without_job_control (); | |
1450 | #endif /* JOB_CONTROL */ | |
1451 | ||
1452 | if (fds_to_close) | |
1453 | close_fd_bitmap (fds_to_close); | |
1454 | ||
1455 | do_piping (pipe_in, pipe_out); | |
1456 | ||
1457 | #if defined (COPROCESS_SUPPORT) | |
1458 | coproc_closeall (); | |
1459 | #endif | |
1460 | ||
1461 | /* If this is a user subshell, set a flag if stdin was redirected. | |
1462 | This is used later to decide whether to redirect fd 0 to | |
1463 | /dev/null for async commands in the subshell. This adds more | |
1464 | sh compatibility, but I'm not sure it's the right thing to do. */ | |
1465 | if (user_subshell) | |
1466 | { | |
1467 | stdin_redir = stdin_redirects (command->redirects); | |
1468 | restore_default_signal (0); | |
1469 | } | |
1470 | ||
1471 | /* If this is an asynchronous command (command &), we want to | |
1472 | redirect the standard input from /dev/null in the absence of | |
1473 | any specific redirection involving stdin. */ | |
1474 | if (should_redir_stdin && stdin_redir == 0) | |
1475 | async_redirect_stdin (); | |
1476 | ||
1477 | /* Do redirections, then dispose of them before recursive call. */ | |
1478 | if (command->redirects) | |
1479 | { | |
1480 | if (do_redirections (command->redirects, RX_ACTIVE) != 0) | |
1481 | exit (invert ? EXECUTION_SUCCESS : EXECUTION_FAILURE); | |
1482 | ||
1483 | dispose_redirects (command->redirects); | |
1484 | command->redirects = (REDIRECT *)NULL; | |
1485 | } | |
1486 | ||
1487 | if (command->type == cm_subshell) | |
1488 | tcom = command->value.Subshell->command; | |
1489 | else if (user_coproc) | |
1490 | tcom = command->value.Coproc->command; | |
1491 | else | |
1492 | tcom = command; | |
1493 | ||
1494 | if (command->flags & CMD_TIME_PIPELINE) | |
1495 | tcom->flags |= CMD_TIME_PIPELINE; | |
1496 | if (command->flags & CMD_TIME_POSIX) | |
1497 | tcom->flags |= CMD_TIME_POSIX; | |
1498 | ||
1499 | /* Make sure the subshell inherits any CMD_IGNORE_RETURN flag. */ | |
1500 | if ((command->flags & CMD_IGNORE_RETURN) && tcom != command) | |
1501 | tcom->flags |= CMD_IGNORE_RETURN; | |
1502 | ||
1503 | /* If this is a simple command, tell execute_disk_command that it | |
1504 | might be able to get away without forking and simply exec. | |
1505 | This means things like ( sleep 10 ) will only cause one fork. | |
1506 | If we're timing the command or inverting its return value, however, | |
1507 | we cannot do this optimization. */ | |
1508 | if ((user_subshell || user_coproc) && (tcom->type == cm_simple || tcom->type == cm_subshell) && | |
1509 | ((tcom->flags & CMD_TIME_PIPELINE) == 0) && | |
1510 | ((tcom->flags & CMD_INVERT_RETURN) == 0)) | |
1511 | { | |
1512 | tcom->flags |= CMD_NO_FORK; | |
1513 | if (tcom->type == cm_simple) | |
1514 | tcom->value.Simple->flags |= CMD_NO_FORK; | |
1515 | } | |
1516 | ||
1517 | invert = (tcom->flags & CMD_INVERT_RETURN) != 0; | |
1518 | tcom->flags &= ~CMD_INVERT_RETURN; | |
1519 | ||
1520 | result = setjmp (top_level); | |
1521 | ||
1522 | /* If we're inside a function while executing this subshell, we | |
1523 | need to handle a possible `return'. */ | |
1524 | function_value = 0; | |
1525 | if (return_catch_flag) | |
1526 | function_value = setjmp (return_catch); | |
1527 | ||
1528 | /* If we're going to exit the shell, we don't want to invert the return | |
1529 | status. */ | |
1530 | if (result == EXITPROG) | |
1531 | invert = 0, return_code = last_command_exit_value; | |
1532 | else if (result) | |
1533 | return_code = EXECUTION_FAILURE; | |
1534 | else if (function_value) | |
1535 | return_code = return_catch_value; | |
1536 | else | |
1537 | return_code = execute_command_internal ((COMMAND *)tcom, asynchronous, NO_PIPE, NO_PIPE, fds_to_close); | |
1538 | ||
1539 | /* If we are asked to, invert the return value. */ | |
1540 | if (invert) | |
1541 | return_code = (return_code == EXECUTION_SUCCESS) ? EXECUTION_FAILURE | |
1542 | : EXECUTION_SUCCESS; | |
1543 | ||
1544 | /* If we were explicitly placed in a subshell with (), we need | |
1545 | to do the `shell cleanup' things, such as running traps[0]. */ | |
1546 | if (user_subshell && signal_is_trapped (0)) | |
1547 | { | |
1548 | last_command_exit_value = return_code; | |
1549 | return_code = run_exit_trap (); | |
1550 | } | |
1551 | ||
1552 | subshell_level--; | |
1553 | return (return_code); | |
1554 | /* NOTREACHED */ | |
1555 | } | |
1556 | ||
1557 | #if defined (COPROCESS_SUPPORT) | |
1558 | #define COPROC_MAX 16 | |
1559 | ||
1560 | typedef struct cpelement | |
1561 | { | |
1562 | struct cpelement *next; | |
1563 | struct coproc *coproc; | |
1564 | } | |
1565 | cpelement_t; | |
1566 | ||
1567 | typedef struct cplist | |
1568 | { | |
1569 | struct cpelement *head; | |
1570 | struct cpelement *tail; | |
1571 | int ncoproc; | |
1572 | } | |
1573 | cplist_t; | |
1574 | ||
1575 | static struct cpelement *cpe_alloc __P((struct coproc *)); | |
1576 | static void cpe_dispose __P((struct cpelement *)); | |
1577 | static struct cpelement *cpl_add __P((struct coproc *)); | |
1578 | static struct cpelement *cpl_delete __P((pid_t)); | |
1579 | static void cpl_reap __P((void)); | |
1580 | static void cpl_flush __P((void)); | |
1581 | static void cpl_closeall __P((void)); | |
1582 | static struct cpelement *cpl_search __P((pid_t)); | |
1583 | static struct cpelement *cpl_searchbyname __P((const char *)); | |
1584 | static void cpl_prune __P((void)); | |
1585 | ||
1586 | static void coproc_free __P((struct coproc *)); | |
1587 | ||
1588 | /* Will go away when there is fully-implemented support for multiple coprocs. */ | |
1589 | Coproc sh_coproc = { 0, NO_PID, -1, -1, 0, 0, 0, 0 }; | |
1590 | ||
1591 | cplist_t coproc_list = {0, 0, 0}; | |
1592 | ||
1593 | /* Functions to manage the list of coprocs */ | |
1594 | ||
1595 | static struct cpelement * | |
1596 | cpe_alloc (cp) | |
1597 | Coproc *cp; | |
1598 | { | |
1599 | struct cpelement *cpe; | |
1600 | ||
1601 | cpe = (struct cpelement *)xmalloc (sizeof (struct cpelement)); | |
1602 | cpe->coproc = cp; | |
1603 | cpe->next = (struct cpelement *)0; | |
1604 | return cpe; | |
1605 | } | |
1606 | ||
1607 | static void | |
1608 | cpe_dispose (cpe) | |
1609 | struct cpelement *cpe; | |
1610 | { | |
1611 | free (cpe); | |
1612 | } | |
1613 | ||
1614 | static struct cpelement * | |
1615 | cpl_add (cp) | |
1616 | Coproc *cp; | |
1617 | { | |
1618 | struct cpelement *cpe; | |
1619 | ||
1620 | cpe = cpe_alloc (cp); | |
1621 | ||
1622 | if (coproc_list.head == 0) | |
1623 | { | |
1624 | coproc_list.head = coproc_list.tail = cpe; | |
1625 | coproc_list.ncoproc = 0; /* just to make sure */ | |
1626 | } | |
1627 | else | |
1628 | { | |
1629 | coproc_list.tail->next = cpe; | |
1630 | coproc_list.tail = cpe; | |
1631 | } | |
1632 | coproc_list.ncoproc++; | |
1633 | ||
1634 | return cpe; | |
1635 | } | |
1636 | ||
1637 | static struct cpelement * | |
1638 | cpl_delete (pid) | |
1639 | pid_t pid; | |
1640 | { | |
1641 | struct cpelement *prev, *p; | |
1642 | ||
1643 | for (prev = p = coproc_list.head; p; prev = p, p = p->next) | |
1644 | if (p->coproc->c_pid == pid) | |
1645 | { | |
1646 | prev->next = p->next; /* remove from list */ | |
1647 | break; | |
1648 | } | |
1649 | ||
1650 | if (p == 0) | |
1651 | return 0; /* not found */ | |
1652 | ||
1653 | #if defined (DEBUG) | |
1654 | itrace("cpl_delete: deleting %d", pid); | |
1655 | #endif | |
1656 | ||
1657 | /* Housekeeping in the border cases. */ | |
1658 | if (p == coproc_list.head) | |
1659 | coproc_list.head = coproc_list.head->next; | |
1660 | else if (p == coproc_list.tail) | |
1661 | coproc_list.tail = prev; | |
1662 | ||
1663 | coproc_list.ncoproc--; | |
1664 | if (coproc_list.ncoproc == 0) | |
1665 | coproc_list.head = coproc_list.tail = 0; | |
1666 | else if (coproc_list.ncoproc == 1) | |
1667 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1668 | ||
1669 | return (p); | |
1670 | } | |
1671 | ||
1672 | static void | |
1673 | cpl_reap () | |
1674 | { | |
631b20c6 | 1675 | struct cpelement *p, *next, *nh, *nt; |
19baff85 | 1676 | |
631b20c6 CR |
1677 | /* Build a new list by removing dead coprocs and fix up the coproc_list |
1678 | pointers when done. */ | |
1679 | nh = nt = next = (struct cpelement *)0; | |
1680 | for (p = coproc_list.head; p; p = next) | |
1681 | { | |
1682 | next = p->next; | |
1683 | if (p->coproc->c_flags & COPROC_DEAD) | |
1684 | { | |
1685 | coproc_list.ncoproc--; /* keep running count, fix up pointers later */ | |
19baff85 CR |
1686 | |
1687 | #if defined (DEBUG) | |
631b20c6 | 1688 | itrace("cpl_reap: deleting %d", p->coproc->c_pid); |
19baff85 CR |
1689 | #endif |
1690 | ||
631b20c6 CR |
1691 | coproc_dispose (p->coproc); |
1692 | cpe_dispose (p); | |
1693 | } | |
1694 | else if (nh == 0) | |
1695 | nh = nt = p; | |
1696 | else | |
1697 | { | |
1698 | nt->next = p; | |
1699 | nt = nt->next; | |
1700 | } | |
1701 | } | |
1702 | ||
1703 | nt->next = 0; | |
1704 | ||
1705 | if (coproc_list.ncoproc == 0) | |
1706 | coproc_list.head = coproc_list.tail = 0; | |
1707 | else | |
1708 | { | |
1709 | coproc_list.head = nh; | |
1710 | coproc_list.tail = nt; | |
1711 | if (coproc_list.ncoproc == 1) | |
1712 | coproc_list.tail = coproc_list.head; /* just to make sure */ | |
1713 | } | |
19baff85 CR |
1714 | } |
1715 | ||
1716 | /* Clear out the list of saved statuses */ | |
1717 | static void | |
1718 | cpl_flush () | |
1719 | { | |
1720 | struct cpelement *cpe, *p; | |
1721 | ||
1722 | for (cpe = coproc_list.head; cpe; ) | |
1723 | { | |
1724 | p = cpe; | |
1725 | cpe = cpe->next; | |
1726 | ||
1727 | coproc_dispose (p->coproc); | |
1728 | cpe_dispose (p); | |
1729 | } | |
1730 | ||
1731 | coproc_list.head = coproc_list.tail = 0; | |
1732 | coproc_list.ncoproc = 0; | |
1733 | } | |
1734 | ||
1735 | static void | |
1736 | cpl_closeall () | |
1737 | { | |
1738 | struct cpelement *cpe; | |
1739 | ||
1740 | for (cpe = coproc_list.head; cpe; cpe = cpe->next) | |
1741 | coproc_close (cpe->coproc); | |
1742 | } | |
1743 | ||
1744 | static void | |
1745 | cpl_fdchk (fd) | |
1746 | int fd; | |
1747 | { | |
1748 | struct cpelement *cpe; | |
1749 | ||
1750 | for (cpe = coproc_list.head; cpe; cpe = cpe->next) | |
1751 | coproc_checkfd (cpe->coproc, fd); | |
1752 | } | |
1753 | ||
1754 | /* Search for PID in the list of coprocs; return the cpelement struct if | |
1755 | found. If not found, return NULL. */ | |
1756 | static struct cpelement * | |
1757 | cpl_search (pid) | |
1758 | pid_t pid; | |
1759 | { | |
1760 | struct cpelement *cpe; | |
1761 | ||
1762 | for (cpe = coproc_list.head ; cpe; cpe = cpe->next) | |
1763 | if (cpe->coproc->c_pid == pid) | |
1764 | return cpe; | |
1765 | return (struct cpelement *)NULL; | |
1766 | } | |
1767 | ||
1768 | /* Search for the coproc named NAME in the list of coprocs; return the | |
1769 | cpelement struct if found. If not found, return NULL. */ | |
1770 | static struct cpelement * | |
1771 | cpl_searchbyname (name) | |
1772 | const char *name; | |
1773 | { | |
1774 | struct cpelement *cp; | |
1775 | ||
1776 | for (cp = coproc_list.head ; cp; cp = cp->next) | |
1777 | if (STREQ (cp->coproc->c_name, name)) | |
1778 | return cp; | |
1779 | return (struct cpelement *)NULL; | |
1780 | } | |
1781 | ||
1782 | #if 0 | |
1783 | static void | |
1784 | cpl_prune () | |
1785 | { | |
1786 | struct cpelement *cp; | |
1787 | ||
1788 | while (coproc_list.head && coproc_list.ncoproc > COPROC_MAX) | |
1789 | { | |
1790 | cp = coproc_list.head; | |
1791 | coproc_list.head = coproc_list.head->next; | |
1792 | coproc_dispose (cp->coproc); | |
1793 | cpe_dispose (cp); | |
1794 | coproc_list.ncoproc--; | |
1795 | } | |
1796 | } | |
1797 | #endif | |
1798 | ||
1799 | /* These currently use a single global "shell coproc" but are written in a | |
1800 | way to not preclude additional coprocs later (using the list management | |
1801 | package above). */ | |
1802 | ||
1803 | struct coproc * | |
1804 | getcoprocbypid (pid) | |
1805 | pid_t pid; | |
1806 | { | |
1807 | #if MULTIPLE_COPROCS | |
1808 | struct cpelement *p; | |
1809 | ||
1810 | p = cpl_search (pid); | |
1811 | return (p ? p->coproc : 0); | |
1812 | #else | |
1813 | return (pid == sh_coproc.c_pid ? &sh_coproc : 0); | |
1814 | #endif | |
1815 | } | |
1816 | ||
1817 | struct coproc * | |
1818 | getcoprocbyname (name) | |
1819 | const char *name; | |
1820 | { | |
1821 | #if MULTIPLE_COPROCS | |
1822 | struct cpelement *p; | |
1823 | ||
1824 | p = cpl_searchbyname (name); | |
1825 | return (p ? p->coproc : 0); | |
1826 | #else | |
1827 | return ((sh_coproc.c_name && STREQ (sh_coproc.c_name, name)) ? &sh_coproc : 0); | |
1828 | #endif | |
1829 | } | |
1830 | ||
1831 | void | |
1832 | coproc_init (cp) | |
1833 | struct coproc *cp; | |
1834 | { | |
1835 | cp->c_name = 0; | |
1836 | cp->c_pid = NO_PID; | |
1837 | cp->c_rfd = cp->c_wfd = -1; | |
1838 | cp->c_rsave = cp->c_wsave = -1; | |
1839 | cp->c_flags = cp->c_status = 0; | |
1840 | } | |
1841 | ||
1842 | struct coproc * | |
1843 | coproc_alloc (name, pid) | |
1844 | char *name; | |
1845 | pid_t pid; | |
1846 | { | |
1847 | struct coproc *cp; | |
1848 | ||
1849 | #if MULTIPLE_COPROCS | |
1850 | cp = (struct coproc *)xmalloc (sizeof (struct coproc)); | |
1851 | #else | |
1852 | cp = &sh_coproc; | |
1853 | #endif | |
1854 | coproc_init (cp); | |
1855 | ||
1856 | cp->c_name = savestring (name); | |
1857 | cp->c_pid = pid; | |
1858 | ||
1859 | #if MULTIPLE_COPROCS | |
1860 | cpl_add (cp); | |
1861 | #endif | |
1862 | ||
1863 | return (cp); | |
1864 | } | |
1865 | ||
1866 | static void | |
1867 | coproc_free (cp) | |
1868 | struct coproc *cp; | |
1869 | { | |
1870 | free (cp); | |
1871 | } | |
1872 | ||
1873 | void | |
1874 | coproc_dispose (cp) | |
1875 | struct coproc *cp; | |
1876 | { | |
1877 | if (cp == 0) | |
1878 | return; | |
1879 | ||
1880 | coproc_unsetvars (cp); | |
1881 | FREE (cp->c_name); | |
1882 | coproc_close (cp); | |
1883 | #if MULTIPLE_COPROCS | |
1884 | coproc_free (cp); | |
1885 | #else | |
1886 | coproc_init (cp); | |
1887 | #endif | |
1888 | } | |
1889 | ||
1890 | /* Placeholder for now. Will require changes for multiple coprocs */ | |
1891 | void | |
1892 | coproc_flush () | |
1893 | { | |
1894 | #if MULTIPLE_COPROCS | |
1895 | cpl_flush (); | |
1896 | #else | |
1897 | coproc_dispose (&sh_coproc); | |
1898 | #endif | |
1899 | } | |
1900 | ||
1901 | void | |
1902 | coproc_close (cp) | |
1903 | struct coproc *cp; | |
1904 | { | |
1905 | if (cp->c_rfd >= 0) | |
1906 | { | |
1907 | close (cp->c_rfd); | |
1908 | cp->c_rfd = -1; | |
1909 | } | |
1910 | if (cp->c_wfd >= 0) | |
1911 | { | |
1912 | close (cp->c_wfd); | |
1913 | cp->c_wfd = -1; | |
1914 | } | |
1915 | cp->c_rsave = cp->c_wsave = -1; | |
1916 | } | |
1917 | ||
1918 | void | |
1919 | coproc_closeall () | |
1920 | { | |
1921 | #if MULTIPLE_COPROCS | |
1922 | cpl_closeall (); | |
1923 | #else | |
1924 | coproc_close (&sh_coproc); /* XXX - will require changes for multiple coprocs */ | |
1925 | #endif | |
1926 | } | |
1927 | ||
1928 | void | |
1929 | coproc_reap () | |
1930 | { | |
1931 | #if MULTIPLE_COPROCS | |
1932 | cpl_reap (); | |
1933 | #else | |
1934 | struct coproc *cp; | |
1935 | ||
1936 | cp = &sh_coproc; /* XXX - will require changes for multiple coprocs */ | |
1937 | if (cp && (cp->c_flags & COPROC_DEAD)) | |
1938 | coproc_dispose (cp); | |
1939 | #endif | |
1940 | } | |
1941 | ||
1942 | void | |
1943 | coproc_rclose (cp, fd) | |
1944 | struct coproc *cp; | |
1945 | int fd; | |
1946 | { | |
1947 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
1948 | { | |
1949 | close (cp->c_rfd); | |
1950 | cp->c_rfd = -1; | |
1951 | } | |
1952 | } | |
1953 | ||
1954 | void | |
1955 | coproc_wclose (cp, fd) | |
1956 | struct coproc *cp; | |
1957 | int fd; | |
1958 | { | |
1959 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
1960 | { | |
1961 | close (cp->c_wfd); | |
1962 | cp->c_wfd = -1; | |
1963 | } | |
1964 | } | |
1965 | ||
1966 | void | |
1967 | coproc_checkfd (cp, fd) | |
1968 | struct coproc *cp; | |
1969 | int fd; | |
1970 | { | |
1971 | int update; | |
1972 | ||
1973 | update = 0; | |
1974 | if (cp->c_rfd >= 0 && cp->c_rfd == fd) | |
1975 | update = cp->c_rfd = -1; | |
1976 | if (cp->c_wfd >= 0 && cp->c_wfd == fd) | |
1977 | update = cp->c_wfd = -1; | |
1978 | if (update) | |
1979 | coproc_setvars (cp); | |
1980 | } | |
1981 | ||
1982 | void | |
1983 | coproc_fdchk (fd) | |
1984 | int fd; | |
1985 | { | |
1986 | #if MULTIPLE_COPROCS | |
1987 | cpl_fdchk (fd); | |
1988 | #else | |
1989 | coproc_checkfd (&sh_coproc, fd); | |
1990 | #endif | |
1991 | } | |
1992 | ||
1993 | void | |
1994 | coproc_fdclose (cp, fd) | |
1995 | struct coproc *cp; | |
1996 | int fd; | |
1997 | { | |
1998 | coproc_rclose (cp, fd); | |
1999 | coproc_wclose (cp, fd); | |
2000 | coproc_setvars (cp); | |
2001 | } | |
2002 | ||
2003 | void | |
2004 | coproc_fdsave (cp) | |
2005 | struct coproc *cp; | |
2006 | { | |
2007 | cp->c_rsave = cp->c_rfd; | |
2008 | cp->c_wsave = cp->c_wfd; | |
2009 | } | |
2010 | ||
2011 | void | |
2012 | coproc_fdrestore (cp) | |
2013 | struct coproc *cp; | |
2014 | { | |
2015 | cp->c_rfd = cp->c_rsave; | |
2016 | cp->c_wfd = cp->c_wsave; | |
2017 | } | |
2018 | ||
2019 | void | |
2020 | coproc_pidchk (pid, status) | |
2021 | pid_t pid; | |
2022 | { | |
2023 | struct coproc *cp; | |
2024 | ||
2025 | #if MULTIPLE_COPROCS | |
2026 | struct cpelement *cpe; | |
2027 | ||
2028 | cpe = cpl_delete (pid); | |
2029 | cp = cpe ? cpe->coproc : 0; | |
2030 | #else | |
2031 | cp = getcoprocbypid (pid); | |
2032 | #endif | |
2033 | if (cp) | |
2034 | { | |
2035 | #if 0 | |
2036 | itrace("coproc_pidchk: pid %d has died", pid); | |
2037 | #endif | |
2038 | cp->c_status = status; | |
2039 | cp->c_flags |= COPROC_DEAD; | |
2040 | cp->c_flags &= ~COPROC_RUNNING; | |
2041 | #if MULTIPLE_COPROCS | |
2042 | coproc_dispose (cp); | |
2043 | #else | |
2044 | coproc_unsetvars (cp); | |
2045 | #endif | |
2046 | } | |
2047 | } | |
2048 | ||
2049 | void | |
2050 | coproc_setvars (cp) | |
2051 | struct coproc *cp; | |
2052 | { | |
2053 | SHELL_VAR *v; | |
2054 | char *namevar, *t; | |
2055 | int l; | |
2056 | #if defined (ARRAY_VARS) | |
2057 | arrayind_t ind; | |
2058 | #endif | |
2059 | ||
2060 | if (cp->c_name == 0) | |
2061 | return; | |
2062 | ||
2063 | l = strlen (cp->c_name); | |
2064 | namevar = xmalloc (l + 16); | |
2065 | ||
2066 | #if defined (ARRAY_VARS) | |
2067 | v = find_variable (cp->c_name); | |
2068 | if (v == 0) | |
2069 | v = make_new_array_variable (cp->c_name); | |
2070 | if (array_p (v) == 0) | |
2071 | v = convert_var_to_array (v); | |
2072 | ||
2073 | t = itos (cp->c_rfd); | |
2074 | ind = 0; | |
2075 | v = bind_array_variable (cp->c_name, ind, t, 0); | |
2076 | free (t); | |
2077 | ||
2078 | t = itos (cp->c_wfd); | |
2079 | ind = 1; | |
2080 | bind_array_variable (cp->c_name, ind, t, 0); | |
2081 | free (t); | |
2082 | #else | |
2083 | sprintf (namevar, "%s_READ", cp->c_name); | |
2084 | t = itos (cp->c_rfd); | |
2085 | bind_variable (namevar, t, 0); | |
2086 | free (t); | |
2087 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
2088 | t = itos (cp->c_wfd); | |
2089 | bind_variable (namevar, t, 0); | |
2090 | free (t); | |
2091 | #endif | |
2092 | ||
2093 | sprintf (namevar, "%s_PID", cp->c_name); | |
2094 | t = itos (cp->c_pid); | |
2095 | bind_variable (namevar, t, 0); | |
2096 | free (t); | |
2097 | ||
2098 | free (namevar); | |
2099 | } | |
2100 | ||
2101 | void | |
2102 | coproc_unsetvars (cp) | |
2103 | struct coproc *cp; | |
2104 | { | |
2105 | int l; | |
2106 | char *namevar; | |
2107 | ||
2108 | if (cp->c_name == 0) | |
2109 | return; | |
2110 | ||
2111 | l = strlen (cp->c_name); | |
2112 | namevar = xmalloc (l + 16); | |
2113 | ||
2114 | sprintf (namevar, "%s_PID", cp->c_name); | |
2115 | unbind_variable (namevar); | |
2116 | ||
2117 | #if defined (ARRAY_VARS) | |
2118 | unbind_variable (cp->c_name); | |
2119 | #else | |
2120 | sprintf (namevar, "%s_READ", cp->c_name); | |
2121 | unbind_variable (namevar); | |
2122 | sprintf (namevar, "%s_WRITE", cp->c_name); | |
2123 | unbind_variable (namevar); | |
2124 | #endif | |
2125 | ||
2126 | free (namevar); | |
2127 | } | |
2128 | ||
2129 | static int | |
2130 | execute_coproc (command, pipe_in, pipe_out, fds_to_close) | |
2131 | COMMAND *command; | |
2132 | int pipe_in, pipe_out; | |
2133 | struct fd_bitmap *fds_to_close; | |
2134 | { | |
2135 | int rpipe[2], wpipe[2], estat; | |
2136 | pid_t coproc_pid; | |
2137 | Coproc *cp; | |
2138 | char *tcmd; | |
2139 | ||
2140 | /* XXX -- can be removed after changes to handle multiple coprocs */ | |
2141 | #if !MULTIPLE_COPROCS | |
2142 | if (sh_coproc.c_pid != NO_PID) | |
2143 | internal_warning ("execute_coproc: coproc [%d:%s] still exists", sh_coproc.c_pid, sh_coproc.c_name); | |
2144 | coproc_init (&sh_coproc); | |
2145 | #endif | |
2146 | ||
2147 | command_string_index = 0; | |
2148 | tcmd = make_command_string (command); | |
2149 | ||
2150 | sh_openpipe ((int *)&rpipe); /* 0 = parent read, 1 = child write */ | |
2151 | sh_openpipe ((int *)&wpipe); /* 0 = child read, 1 = parent write */ | |
2152 | ||
2153 | coproc_pid = make_child (savestring (tcmd), 1); | |
2154 | if (coproc_pid == 0) | |
2155 | { | |
2156 | close (rpipe[0]); | |
2157 | close (wpipe[1]); | |
2158 | ||
2159 | estat = execute_in_subshell (command, 1, wpipe[0], rpipe[1], fds_to_close); | |
2160 | ||
2161 | fflush (stdout); | |
2162 | fflush (stderr); | |
2163 | ||
2164 | exit (estat); | |
2165 | } | |
2166 | ||
2167 | close (rpipe[1]); | |
2168 | close (wpipe[0]); | |
2169 | ||
2170 | cp = coproc_alloc (command->value.Coproc->name, coproc_pid); | |
2171 | cp->c_rfd = rpipe[0]; | |
2172 | cp->c_wfd = wpipe[1]; | |
2173 | ||
2174 | SET_CLOSE_ON_EXEC (cp->c_rfd); | |
2175 | SET_CLOSE_ON_EXEC (cp->c_wfd); | |
2176 | ||
2177 | coproc_setvars (cp); | |
2178 | ||
2179 | #if 0 | |
2180 | itrace ("execute_coproc: [%d] %s", coproc_pid, the_printed_command); | |
2181 | #endif | |
2182 | ||
2183 | close_pipes (pipe_in, pipe_out); | |
2184 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
2185 | unlink_fifo_list (); | |
2186 | #endif | |
2187 | stop_pipeline (1, (COMMAND *)NULL); | |
2188 | DESCRIBE_PID (coproc_pid); | |
2189 | run_pending_traps (); | |
2190 | ||
2191 | return (EXECUTION_SUCCESS); | |
2192 | } | |
2193 | #endif | |
2194 | ||
2195 | static void | |
2196 | restore_stdin (s) | |
2197 | int s; | |
2198 | { | |
2199 | dup2 (s, 0); | |
2200 | close (s); | |
2201 | } | |
2202 | ||
2203 | /* Catch-all cleanup function for lastpipe code for unwind-protects */ | |
2204 | static void | |
2205 | lastpipe_cleanup (s) | |
2206 | int s; | |
2207 | { | |
2208 | unfreeze_jobs_list (); | |
2209 | } | |
2210 | ||
2211 | static int | |
2212 | execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2213 | COMMAND *command; | |
2214 | int asynchronous, pipe_in, pipe_out; | |
2215 | struct fd_bitmap *fds_to_close; | |
2216 | { | |
2217 | int prev, fildes[2], new_bitmap_size, dummyfd, ignore_return, exec_result; | |
2218 | int lstdin, lastpipe_flag, lastpipe_jid; | |
2219 | COMMAND *cmd; | |
2220 | struct fd_bitmap *fd_bitmap; | |
2221 | pid_t lastpid; | |
2222 | ||
2223 | #if defined (JOB_CONTROL) | |
2224 | sigset_t set, oset; | |
2225 | BLOCK_CHILD (set, oset); | |
2226 | #endif /* JOB_CONTROL */ | |
2227 | ||
2228 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2229 | ||
2230 | prev = pipe_in; | |
2231 | cmd = command; | |
2232 | ||
2233 | while (cmd && cmd->type == cm_connection && | |
2234 | cmd->value.Connection && cmd->value.Connection->connector == '|') | |
2235 | { | |
2236 | /* Make a pipeline between the two commands. */ | |
2237 | if (pipe (fildes) < 0) | |
2238 | { | |
2239 | sys_error (_("pipe error")); | |
2240 | #if defined (JOB_CONTROL) | |
2241 | terminate_current_pipeline (); | |
2242 | kill_current_pipeline (); | |
2243 | UNBLOCK_CHILD (oset); | |
2244 | #endif /* JOB_CONTROL */ | |
2245 | last_command_exit_value = EXECUTION_FAILURE; | |
2246 | /* The unwind-protects installed below will take care | |
2247 | of closing all of the open file descriptors. */ | |
2248 | throw_to_top_level (); | |
2249 | return (EXECUTION_FAILURE); /* XXX */ | |
2250 | } | |
2251 | ||
2252 | /* Here is a problem: with the new file close-on-exec | |
2253 | code, the read end of the pipe (fildes[0]) stays open | |
2254 | in the first process, so that process will never get a | |
2255 | SIGPIPE. There is no way to signal the first process | |
2256 | that it should close fildes[0] after forking, so it | |
2257 | remains open. No SIGPIPE is ever sent because there | |
2258 | is still a file descriptor open for reading connected | |
2259 | to the pipe. We take care of that here. This passes | |
2260 | around a bitmap of file descriptors that must be | |
2261 | closed after making a child process in execute_simple_command. */ | |
2262 | ||
2263 | /* We need fd_bitmap to be at least as big as fildes[0]. | |
2264 | If fildes[0] is less than fds_to_close->size, then | |
2265 | use fds_to_close->size. */ | |
2266 | new_bitmap_size = (fildes[0] < fds_to_close->size) | |
2267 | ? fds_to_close->size | |
2268 | : fildes[0] + 8; | |
2269 | ||
2270 | fd_bitmap = new_fd_bitmap (new_bitmap_size); | |
2271 | ||
2272 | /* Now copy the old information into the new bitmap. */ | |
2273 | xbcopy ((char *)fds_to_close->bitmap, (char *)fd_bitmap->bitmap, fds_to_close->size); | |
2274 | ||
2275 | /* And mark the pipe file descriptors to be closed. */ | |
2276 | fd_bitmap->bitmap[fildes[0]] = 1; | |
2277 | ||
2278 | /* In case there are pipe or out-of-processes errors, we | |
2279 | want all these file descriptors to be closed when | |
2280 | unwind-protects are run, and the storage used for the | |
2281 | bitmaps freed up. */ | |
2282 | begin_unwind_frame ("pipe-file-descriptors"); | |
2283 | add_unwind_protect (dispose_fd_bitmap, fd_bitmap); | |
2284 | add_unwind_protect (close_fd_bitmap, fd_bitmap); | |
2285 | if (prev >= 0) | |
2286 | add_unwind_protect (close, prev); | |
2287 | dummyfd = fildes[1]; | |
2288 | add_unwind_protect (close, dummyfd); | |
2289 | ||
2290 | #if defined (JOB_CONTROL) | |
2291 | add_unwind_protect (restore_signal_mask, &oset); | |
2292 | #endif /* JOB_CONTROL */ | |
2293 | ||
2294 | if (ignore_return && cmd->value.Connection->first) | |
2295 | cmd->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2296 | execute_command_internal (cmd->value.Connection->first, asynchronous, | |
2297 | prev, fildes[1], fd_bitmap); | |
2298 | ||
2299 | if (prev >= 0) | |
2300 | close (prev); | |
2301 | ||
2302 | prev = fildes[0]; | |
2303 | close (fildes[1]); | |
2304 | ||
2305 | dispose_fd_bitmap (fd_bitmap); | |
2306 | discard_unwind_frame ("pipe-file-descriptors"); | |
2307 | ||
2308 | cmd = cmd->value.Connection->second; | |
2309 | } | |
2310 | ||
2311 | lastpid = last_made_pid; | |
2312 | ||
2313 | /* Now execute the rightmost command in the pipeline. */ | |
2314 | if (ignore_return && cmd) | |
2315 | cmd->flags |= CMD_IGNORE_RETURN; | |
2316 | ||
2317 | #if defined (JOB_CONTROL) | |
2318 | lastpipe_flag = 0; | |
2319 | begin_unwind_frame ("lastpipe-exec"); | |
2320 | lstdin = -1; | |
2321 | /* If the `lastpipe' option is set with shopt, and job control is not | |
2322 | enabled, execute the last element of non-async pipelines in the | |
2323 | current shell environment. */ | |
2324 | if (lastpipe_opt && job_control == 0 && asynchronous == 0 && pipe_out == NO_PIPE && prev > 0) | |
2325 | { | |
2326 | lstdin = move_to_high_fd (0, 0, 255); | |
2327 | if (lstdin > 0) | |
2328 | { | |
2329 | do_piping (prev, pipe_out); | |
2330 | prev = NO_PIPE; | |
2331 | add_unwind_protect (restore_stdin, lstdin); | |
2332 | lastpipe_flag = 1; | |
2333 | freeze_jobs_list (); | |
2334 | lastpipe_jid = stop_pipeline (0, (COMMAND *)NULL); /* XXX */ | |
2335 | add_unwind_protect (lastpipe_cleanup, lastpipe_jid); | |
2336 | } | |
631b20c6 CR |
2337 | if (cmd) |
2338 | cmd->flags |= CMD_LASTPIPE; | |
19baff85 CR |
2339 | } |
2340 | if (prev >= 0) | |
2341 | add_unwind_protect (close, prev); | |
2342 | #endif | |
2343 | ||
2344 | exec_result = execute_command_internal (cmd, asynchronous, prev, pipe_out, fds_to_close); | |
2345 | ||
2346 | #if defined (JOB_CONTROL) | |
2347 | if (lstdin > 0) | |
2348 | restore_stdin (lstdin); | |
2349 | #endif | |
2350 | ||
2351 | if (prev >= 0) | |
2352 | close (prev); | |
2353 | ||
2354 | #if defined (JOB_CONTROL) | |
2355 | UNBLOCK_CHILD (oset); | |
2356 | #endif | |
2357 | ||
2358 | QUIT; | |
2359 | ||
2360 | if (lastpipe_flag) | |
2361 | { | |
2362 | #if defined (JOB_CONTROL) | |
2363 | append_process (savestring (the_printed_command), dollar_dollar_pid, exec_result, lastpipe_jid); | |
2364 | #endif | |
2365 | lstdin = wait_for (lastpid); | |
2366 | #if defined (JOB_CONTROL) | |
2367 | exec_result = job_exit_status (lastpipe_jid); | |
2368 | #endif | |
2369 | unfreeze_jobs_list (); | |
2370 | } | |
2371 | ||
2372 | discard_unwind_frame ("lastpipe-exec"); | |
2373 | ||
2374 | return (exec_result); | |
2375 | } | |
2376 | ||
2377 | static int | |
2378 | execute_connection (command, asynchronous, pipe_in, pipe_out, fds_to_close) | |
2379 | COMMAND *command; | |
2380 | int asynchronous, pipe_in, pipe_out; | |
2381 | struct fd_bitmap *fds_to_close; | |
2382 | { | |
2383 | COMMAND *tc, *second; | |
2384 | int ignore_return, exec_result, was_error_trap, invert; | |
2385 | volatile int save_line_number; | |
2386 | ||
2387 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2388 | ||
2389 | switch (command->value.Connection->connector) | |
2390 | { | |
2391 | /* Do the first command asynchronously. */ | |
2392 | case '&': | |
2393 | tc = command->value.Connection->first; | |
2394 | if (tc == 0) | |
2395 | return (EXECUTION_SUCCESS); | |
2396 | ||
2397 | if (ignore_return) | |
2398 | tc->flags |= CMD_IGNORE_RETURN; | |
2399 | tc->flags |= CMD_AMPERSAND; | |
2400 | ||
2401 | /* If this shell was compiled without job control support, | |
2402 | if we are currently in a subshell via `( xxx )', or if job | |
2403 | control is not active then the standard input for an | |
2404 | asynchronous command is forced to /dev/null. */ | |
2405 | #if defined (JOB_CONTROL) | |
2406 | if ((subshell_environment || !job_control) && !stdin_redir) | |
2407 | #else | |
2408 | if (!stdin_redir) | |
2409 | #endif /* JOB_CONTROL */ | |
2410 | tc->flags |= CMD_STDIN_REDIR; | |
2411 | ||
2412 | exec_result = execute_command_internal (tc, 1, pipe_in, pipe_out, fds_to_close); | |
2413 | QUIT; | |
2414 | ||
2415 | if (tc->flags & CMD_STDIN_REDIR) | |
2416 | tc->flags &= ~CMD_STDIN_REDIR; | |
2417 | ||
2418 | second = command->value.Connection->second; | |
2419 | if (second) | |
2420 | { | |
2421 | if (ignore_return) | |
2422 | second->flags |= CMD_IGNORE_RETURN; | |
2423 | ||
2424 | exec_result = execute_command_internal (second, asynchronous, pipe_in, pipe_out, fds_to_close); | |
2425 | } | |
2426 | ||
2427 | break; | |
2428 | ||
2429 | /* Just call execute command on both sides. */ | |
2430 | case ';': | |
2431 | if (ignore_return) | |
2432 | { | |
2433 | if (command->value.Connection->first) | |
2434 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2435 | if (command->value.Connection->second) | |
2436 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
2437 | } | |
2438 | executing_list++; | |
2439 | QUIT; | |
2440 | execute_command (command->value.Connection->first); | |
2441 | QUIT; | |
2442 | exec_result = execute_command_internal (command->value.Connection->second, | |
2443 | asynchronous, pipe_in, pipe_out, | |
2444 | fds_to_close); | |
2445 | executing_list--; | |
2446 | break; | |
2447 | ||
2448 | case '|': | |
2449 | was_error_trap = signal_is_trapped (ERROR_TRAP) && signal_is_ignored (ERROR_TRAP) == 0; | |
2450 | invert = (command->flags & CMD_INVERT_RETURN) != 0; | |
2451 | ignore_return = (command->flags & CMD_IGNORE_RETURN) != 0; | |
2452 | ||
2453 | line_number_for_err_trap = line_number; | |
2454 | exec_result = execute_pipeline (command, asynchronous, pipe_in, pipe_out, fds_to_close); | |
2455 | ||
2456 | if (was_error_trap && ignore_return == 0 && invert == 0 && exec_result != EXECUTION_SUCCESS) | |
2457 | { | |
2458 | last_command_exit_value = exec_result; | |
2459 | save_line_number = line_number; | |
2460 | line_number = line_number_for_err_trap; | |
2461 | run_error_trap (); | |
2462 | line_number = save_line_number; | |
2463 | } | |
2464 | ||
2465 | if (ignore_return == 0 && invert == 0 && exit_immediately_on_error && exec_result != EXECUTION_SUCCESS) | |
2466 | { | |
2467 | last_command_exit_value = exec_result; | |
2468 | run_pending_traps (); | |
2469 | jump_to_top_level (ERREXIT); | |
2470 | } | |
2471 | ||
2472 | break; | |
2473 | ||
2474 | case AND_AND: | |
2475 | case OR_OR: | |
2476 | if (asynchronous) | |
2477 | { | |
2478 | /* If we have something like `a && b &' or `a || b &', run the | |
2479 | && or || stuff in a subshell. Force a subshell and just call | |
2480 | execute_command_internal again. Leave asynchronous on | |
2481 | so that we get a report from the parent shell about the | |
2482 | background job. */ | |
2483 | command->flags |= CMD_FORCE_SUBSHELL; | |
2484 | exec_result = execute_command_internal (command, 1, pipe_in, pipe_out, fds_to_close); | |
2485 | break; | |
2486 | } | |
2487 | ||
2488 | /* Execute the first command. If the result of that is successful | |
2489 | and the connector is AND_AND, or the result is not successful | |
2490 | and the connector is OR_OR, then execute the second command, | |
2491 | otherwise return. */ | |
2492 | ||
2493 | executing_list++; | |
2494 | if (command->value.Connection->first) | |
2495 | command->value.Connection->first->flags |= CMD_IGNORE_RETURN; | |
2496 | ||
2497 | exec_result = execute_command (command->value.Connection->first); | |
2498 | QUIT; | |
2499 | if (((command->value.Connection->connector == AND_AND) && | |
2500 | (exec_result == EXECUTION_SUCCESS)) || | |
2501 | ((command->value.Connection->connector == OR_OR) && | |
2502 | (exec_result != EXECUTION_SUCCESS))) | |
2503 | { | |
2504 | if (ignore_return && command->value.Connection->second) | |
2505 | command->value.Connection->second->flags |= CMD_IGNORE_RETURN; | |
2506 | ||
2507 | exec_result = execute_command (command->value.Connection->second); | |
2508 | } | |
2509 | executing_list--; | |
2510 | break; | |
2511 | ||
2512 | default: | |
2513 | command_error ("execute_connection", CMDERR_BADCONN, command->value.Connection->connector, 0); | |
2514 | jump_to_top_level (DISCARD); | |
2515 | exec_result = EXECUTION_FAILURE; | |
2516 | } | |
2517 | ||
2518 | return exec_result; | |
2519 | } | |
2520 | ||
2521 | #define REAP() \ | |
2522 | do \ | |
2523 | { \ | |
2524 | if (!interactive_shell) \ | |
2525 | reap_dead_jobs (); \ | |
2526 | } \ | |
2527 | while (0) | |
2528 | ||
2529 | /* Execute a FOR command. The syntax is: FOR word_desc IN word_list; | |
2530 | DO command; DONE */ | |
2531 | static int | |
2532 | execute_for_command (for_command) | |
2533 | FOR_COM *for_command; | |
2534 | { | |
2535 | register WORD_LIST *releaser, *list; | |
2536 | SHELL_VAR *v; | |
2537 | char *identifier; | |
2538 | int retval, save_line_number; | |
2539 | #if 0 | |
2540 | SHELL_VAR *old_value = (SHELL_VAR *)NULL; /* Remember the old value of x. */ | |
2541 | #endif | |
2542 | ||
2543 | save_line_number = line_number; | |
2544 | if (check_identifier (for_command->name, 1) == 0) | |
2545 | { | |
2546 | if (posixly_correct && interactive_shell == 0) | |
2547 | { | |
2548 | last_command_exit_value = EX_BADUSAGE; | |
2549 | jump_to_top_level (ERREXIT); | |
2550 | } | |
2551 | return (EXECUTION_FAILURE); | |
2552 | } | |
2553 | ||
2554 | loop_level++; | |
2555 | identifier = for_command->name->word; | |
2556 | ||
2557 | list = releaser = expand_words_no_vars (for_command->map_list); | |
2558 | ||
2559 | begin_unwind_frame ("for"); | |
2560 | add_unwind_protect (dispose_words, releaser); | |
2561 | ||
2562 | #if 0 | |
2563 | if (lexical_scoping) | |
2564 | { | |
2565 | old_value = copy_variable (find_variable (identifier)); | |
2566 | if (old_value) | |
2567 | add_unwind_protect (dispose_variable, old_value); | |
2568 | } | |
2569 | #endif | |
2570 | ||
2571 | if (for_command->flags & CMD_IGNORE_RETURN) | |
2572 | for_command->action->flags |= CMD_IGNORE_RETURN; | |
2573 | ||
2574 | for (retval = EXECUTION_SUCCESS; list; list = list->next) | |
2575 | { | |
2576 | QUIT; | |
2577 | ||
2578 | line_number = for_command->line; | |
2579 | ||
2580 | /* Remember what this command looks like, for debugger. */ | |
2581 | command_string_index = 0; | |
2582 | print_for_command_head (for_command); | |
2583 | ||
2584 | if (echo_command_at_execute) | |
2585 | xtrace_print_for_command_head (for_command); | |
2586 | ||
2587 | /* Save this command unless it's a trap command and we're not running | |
2588 | a debug trap. */ | |
2589 | #if 0 | |
2590 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) | |
2591 | #else | |
2592 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
2593 | #endif | |
2594 | { | |
2595 | FREE (the_printed_command_except_trap); | |
2596 | the_printed_command_except_trap = savestring (the_printed_command); | |
2597 | } | |
2598 | ||
2599 | retval = run_debug_trap (); | |
2600 | #if defined (DEBUGGER) | |
2601 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2602 | skip the command. */ | |
2603 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
2604 | continue; | |
2605 | #endif | |
2606 | ||
2607 | this_command_name = (char *)NULL; | |
2608 | v = bind_variable (identifier, list->word->word, 0); | |
2609 | if (readonly_p (v) || noassign_p (v)) | |
2610 | { | |
2611 | line_number = save_line_number; | |
2612 | if (readonly_p (v) && interactive_shell == 0 && posixly_correct) | |
2613 | { | |
2614 | last_command_exit_value = EXECUTION_FAILURE; | |
2615 | jump_to_top_level (FORCE_EOF); | |
2616 | } | |
2617 | else | |
2618 | { | |
2619 | dispose_words (releaser); | |
2620 | discard_unwind_frame ("for"); | |
2621 | loop_level--; | |
2622 | return (EXECUTION_FAILURE); | |
2623 | } | |
2624 | } | |
2625 | retval = execute_command (for_command->action); | |
2626 | REAP (); | |
2627 | QUIT; | |
2628 | ||
2629 | if (breaking) | |
2630 | { | |
2631 | breaking--; | |
2632 | break; | |
2633 | } | |
2634 | ||
2635 | if (continuing) | |
2636 | { | |
2637 | continuing--; | |
2638 | if (continuing) | |
2639 | break; | |
2640 | } | |
2641 | } | |
2642 | ||
2643 | loop_level--; | |
2644 | line_number = save_line_number; | |
2645 | ||
2646 | #if 0 | |
2647 | if (lexical_scoping) | |
2648 | { | |
2649 | if (!old_value) | |
2650 | unbind_variable (identifier); | |
2651 | else | |
2652 | { | |
2653 | SHELL_VAR *new_value; | |
2654 | ||
2655 | new_value = bind_variable (identifier, value_cell(old_value), 0); | |
2656 | new_value->attributes = old_value->attributes; | |
2657 | dispose_variable (old_value); | |
2658 | } | |
2659 | } | |
2660 | #endif | |
2661 | ||
2662 | dispose_words (releaser); | |
2663 | discard_unwind_frame ("for"); | |
2664 | return (retval); | |
2665 | } | |
2666 | ||
2667 | #if defined (ARITH_FOR_COMMAND) | |
2668 | /* Execute an arithmetic for command. The syntax is | |
2669 | ||
2670 | for (( init ; step ; test )) | |
2671 | do | |
2672 | body | |
2673 | done | |
2674 | ||
2675 | The execution should be exactly equivalent to | |
2676 | ||
2677 | eval \(\( init \)\) | |
2678 | while eval \(\( test \)\) ; do | |
2679 | body; | |
2680 | eval \(\( step \)\) | |
2681 | done | |
2682 | */ | |
2683 | static intmax_t | |
2684 | eval_arith_for_expr (l, okp) | |
2685 | WORD_LIST *l; | |
2686 | int *okp; | |
2687 | { | |
2688 | WORD_LIST *new; | |
2689 | intmax_t expresult; | |
2690 | int r; | |
2691 | ||
2692 | new = expand_words_no_vars (l); | |
2693 | if (new) | |
2694 | { | |
2695 | if (echo_command_at_execute) | |
2696 | xtrace_print_arith_cmd (new); | |
2697 | this_command_name = "(("; /* )) for expression error messages */ | |
2698 | ||
2699 | command_string_index = 0; | |
2700 | print_arith_command (new); | |
2701 | if (signal_in_progress (DEBUG_TRAP) == 0) | |
2702 | { | |
2703 | FREE (the_printed_command_except_trap); | |
2704 | the_printed_command_except_trap = savestring (the_printed_command); | |
2705 | } | |
2706 | ||
2707 | r = run_debug_trap (); | |
2708 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
2709 | skip the command. */ | |
2710 | #if defined (DEBUGGER) | |
2711 | if (debugging_mode == 0 || r == EXECUTION_SUCCESS) | |
2712 | expresult = evalexp (new->word->word, okp); | |
2713 | else | |
2714 | { | |
2715 | expresult = 0; | |
2716 | if (okp) | |
2717 | *okp = 1; | |
2718 | } | |
2719 | #else | |
2720 | expresult = evalexp (new->word->word, okp); | |
2721 | #endif | |
2722 | dispose_words (new); | |
2723 | } | |
2724 | else | |
2725 | { | |
2726 | expresult = 0; | |
2727 | if (okp) | |
2728 | *okp = 1; | |
2729 | } | |
2730 | return (expresult); | |
2731 | } | |
2732 | ||
2733 | static int | |
2734 | execute_arith_for_command (arith_for_command) | |
2735 | ARITH_FOR_COM *arith_for_command; | |
2736 | { | |
2737 | intmax_t expresult; | |
2738 | int expok, body_status, arith_lineno, save_lineno; | |
2739 | ||
2740 | body_status = EXECUTION_SUCCESS; | |
2741 | loop_level++; | |
2742 | save_lineno = line_number; | |
2743 | ||
2744 | if (arith_for_command->flags & CMD_IGNORE_RETURN) | |
2745 | arith_for_command->action->flags |= CMD_IGNORE_RETURN; | |
2746 | ||
2747 | this_command_name = "(("; /* )) for expression error messages */ | |
2748 | ||
2749 | /* save the starting line number of the command so we can reset | |
2750 | line_number before executing each expression -- for $LINENO | |
2751 | and the DEBUG trap. */ | |
2752 | line_number = arith_lineno = arith_for_command->line; | |
2753 | if (variable_context && interactive_shell) | |
2754 | line_number -= function_line_number; | |
2755 | ||
2756 | /* Evaluate the initialization expression. */ | |
2757 | expresult = eval_arith_for_expr (arith_for_command->init, &expok); | |
2758 | if (expok == 0) | |
2759 | { | |
2760 | line_number = save_lineno; | |
2761 | return (EXECUTION_FAILURE); | |
2762 | } | |
2763 | ||
2764 | while (1) | |
2765 | { | |
2766 | /* Evaluate the test expression. */ | |
2767 | line_number = arith_lineno; | |
2768 | expresult = eval_arith_for_expr (arith_for_command->test, &expok); | |
2769 | line_number = save_lineno; | |
2770 | ||
2771 | if (expok == 0) | |
2772 | { | |
2773 | body_status = EXECUTION_FAILURE; | |
2774 | break; | |
2775 | } | |
2776 | REAP (); | |
2777 | if (expresult == 0) | |
2778 | break; | |
2779 | ||
2780 | /* Execute the body of the arithmetic for command. */ | |
2781 | QUIT; | |
2782 | body_status = execute_command (arith_for_command->action); | |
2783 | QUIT; | |
2784 | ||
2785 | /* Handle any `break' or `continue' commands executed by the body. */ | |
2786 | if (breaking) | |
2787 | { | |
2788 | breaking--; | |
2789 | break; | |
2790 | } | |
2791 | ||
2792 | if (continuing) | |
2793 | { | |
2794 | continuing--; | |
2795 | if (continuing) | |
2796 | break; | |
2797 | } | |
2798 | ||
2799 | /* Evaluate the step expression. */ | |
2800 | line_number = arith_lineno; | |
2801 | expresult = eval_arith_for_expr (arith_for_command->step, &expok); | |
2802 | line_number = save_lineno; | |
2803 | ||
2804 | if (expok == 0) | |
2805 | { | |
2806 | body_status = EXECUTION_FAILURE; | |
2807 | break; | |
2808 | } | |
2809 | } | |
2810 | ||
2811 | loop_level--; | |
2812 | line_number = save_lineno; | |
2813 | ||
2814 | return (body_status); | |
2815 | } | |
2816 | #endif | |
2817 | ||
2818 | #if defined (SELECT_COMMAND) | |
2819 | static int LINES, COLS, tabsize; | |
2820 | ||
2821 | #define RP_SPACE ") " | |
2822 | #define RP_SPACE_LEN 2 | |
2823 | ||
2824 | /* XXX - does not handle numbers > 1000000 at all. */ | |
2825 | #define NUMBER_LEN(s) \ | |
2826 | ((s < 10) ? 1 \ | |
2827 | : ((s < 100) ? 2 \ | |
2828 | : ((s < 1000) ? 3 \ | |
2829 | : ((s < 10000) ? 4 \ | |
2830 | : ((s < 100000) ? 5 \ | |
2831 | : 6))))) | |
2832 | ||
2833 | static int | |
2834 | displen (s) | |
2835 | const char *s; | |
2836 | { | |
2837 | #if defined (HANDLE_MULTIBYTE) | |
2838 | wchar_t *wcstr; | |
2839 | size_t wclen, slen; | |
2840 | ||
2841 | wcstr = 0; | |
2842 | slen = mbstowcs (wcstr, s, 0); | |
2843 | if (slen == -1) | |
2844 | slen = 0; | |
2845 | wcstr = (wchar_t *)xmalloc (sizeof (wchar_t) * (slen + 1)); | |
2846 | mbstowcs (wcstr, s, slen + 1); | |
2847 | wclen = wcswidth (wcstr, slen); | |
2848 | free (wcstr); | |
2849 | return ((int)wclen); | |
2850 | #else | |
2851 | return (STRLEN (s)); | |
2852 | #endif | |
2853 | } | |
2854 | ||
2855 | static int | |
2856 | print_index_and_element (len, ind, list) | |
2857 | int len, ind; | |
2858 | WORD_LIST *list; | |
2859 | { | |
2860 | register WORD_LIST *l; | |
2861 | register int i; | |
2862 | ||
2863 | if (list == 0) | |
2864 | return (0); | |
2865 | for (i = ind, l = list; l && --i; l = l->next) | |
2866 | ; | |
631b20c6 CR |
2867 | if (l == 0) /* don't think this can happen */ |
2868 | return (0); | |
19baff85 CR |
2869 | fprintf (stderr, "%*d%s%s", len, ind, RP_SPACE, l->word->word); |
2870 | return (displen (l->word->word)); | |
2871 | } | |
2872 | ||
2873 | static void | |
2874 | indent (from, to) | |
2875 | int from, to; | |
2876 | { | |
2877 | while (from < to) | |
2878 | { | |
2879 | if ((to / tabsize) > (from / tabsize)) | |
2880 | { | |
2881 | putc ('\t', stderr); | |
2882 | from += tabsize - from % tabsize; | |
2883 | } | |
2884 | else | |
2885 | { | |
2886 | putc (' ', stderr); | |
2887 | from++; | |
2888 | } | |
2889 | } | |
2890 | } | |
2891 | ||
2892 | static void | |
2893 | print_select_list (list, list_len, max_elem_len, indices_len) | |
2894 | WORD_LIST *list; | |
2895 | int list_len, max_elem_len, indices_len; | |
2896 | { | |
2897 | int ind, row, elem_len, pos, cols, rows; | |
2898 | int first_column_indices_len, other_indices_len; | |
2899 | ||
2900 | if (list == 0) | |
2901 | { | |
2902 | putc ('\n', stderr); | |
2903 | return; | |
2904 | } | |
2905 | ||
2906 | cols = max_elem_len ? COLS / max_elem_len : 1; | |
2907 | if (cols == 0) | |
2908 | cols = 1; | |
2909 | rows = list_len ? list_len / cols + (list_len % cols != 0) : 1; | |
2910 | cols = list_len ? list_len / rows + (list_len % rows != 0) : 1; | |
2911 | ||
2912 | if (rows == 1) | |
2913 | { | |
2914 | rows = cols; | |
2915 | cols = 1; | |
2916 | } | |
2917 | ||
2918 | first_column_indices_len = NUMBER_LEN (rows); | |
2919 | other_indices_len = indices_len; | |
2920 | ||
2921 | for (row = 0; row < rows; row++) | |
2922 | { | |
2923 | ind = row; | |
2924 | pos = 0; | |
2925 | while (1) | |
2926 | { | |
2927 | indices_len = (pos == 0) ? first_column_indices_len : other_indices_len; | |
2928 | elem_len = print_index_and_element (indices_len, ind + 1, list); | |
2929 | elem_len += indices_len + RP_SPACE_LEN; | |
2930 | ind += rows; | |
2931 | if (ind >= list_len) | |
2932 | break; | |
2933 | indent (pos + elem_len, pos + max_elem_len); | |
2934 | pos += max_elem_len; | |
2935 | } | |
2936 | putc ('\n', stderr); | |
2937 | } | |
2938 | } | |
2939 | ||
2940 | /* Print the elements of LIST, one per line, preceded by an index from 1 to | |
2941 | LIST_LEN. Then display PROMPT and wait for the user to enter a number. | |
2942 | If the number is between 1 and LIST_LEN, return that selection. If EOF | |
2943 | is read, return a null string. If a blank line is entered, or an invalid | |
2944 | number is entered, the loop is executed again. */ | |
2945 | static char * | |
2946 | select_query (list, list_len, prompt, print_menu) | |
2947 | WORD_LIST *list; | |
2948 | int list_len; | |
2949 | char *prompt; | |
2950 | int print_menu; | |
2951 | { | |
2952 | int max_elem_len, indices_len, len; | |
2953 | intmax_t reply; | |
2954 | WORD_LIST *l; | |
2955 | char *repl_string, *t; | |
2956 | ||
2957 | #if 0 | |
2958 | t = get_string_value ("LINES"); | |
2959 | LINES = (t && *t) ? atoi (t) : 24; | |
2960 | #endif | |
2961 | t = get_string_value ("COLUMNS"); | |
2962 | COLS = (t && *t) ? atoi (t) : 80; | |
2963 | ||
2964 | #if 0 | |
2965 | t = get_string_value ("TABSIZE"); | |
2966 | tabsize = (t && *t) ? atoi (t) : 8; | |
2967 | if (tabsize <= 0) | |
2968 | tabsize = 8; | |
2969 | #else | |
2970 | tabsize = 8; | |
2971 | #endif | |
2972 | ||
2973 | max_elem_len = 0; | |
2974 | for (l = list; l; l = l->next) | |
2975 | { | |
2976 | len = displen (l->word->word); | |
2977 | if (len > max_elem_len) | |
2978 | max_elem_len = len; | |
2979 | } | |
2980 | indices_len = NUMBER_LEN (list_len); | |
2981 | max_elem_len += indices_len + RP_SPACE_LEN + 2; | |
2982 | ||
2983 | while (1) | |
2984 | { | |
2985 | if (print_menu) | |
2986 | print_select_list (list, list_len, max_elem_len, indices_len); | |
2987 | fprintf (stderr, "%s", prompt); | |
2988 | fflush (stderr); | |
2989 | QUIT; | |
2990 | ||
2991 | if (read_builtin ((WORD_LIST *)NULL) != EXECUTION_SUCCESS) | |
2992 | { | |
2993 | putchar ('\n'); | |
2994 | return ((char *)NULL); | |
2995 | } | |
2996 | repl_string = get_string_value ("REPLY"); | |
2997 | if (*repl_string == 0) | |
2998 | { | |
2999 | print_menu = 1; | |
3000 | continue; | |
3001 | } | |
3002 | if (legal_number (repl_string, &reply) == 0) | |
3003 | return ""; | |
3004 | if (reply < 1 || reply > list_len) | |
3005 | return ""; | |
3006 | ||
3007 | for (l = list; l && --reply; l = l->next) | |
3008 | ; | |
631b20c6 | 3009 | return (l->word->word); /* XXX - can't be null? */ |
19baff85 CR |
3010 | } |
3011 | } | |
3012 | ||
3013 | /* Execute a SELECT command. The syntax is: | |
3014 | SELECT word IN list DO command_list DONE | |
3015 | Only `break' or `return' in command_list will terminate | |
3016 | the command. */ | |
3017 | static int | |
3018 | execute_select_command (select_command) | |
3019 | SELECT_COM *select_command; | |
3020 | { | |
3021 | WORD_LIST *releaser, *list; | |
3022 | SHELL_VAR *v; | |
3023 | char *identifier, *ps3_prompt, *selection; | |
3024 | int retval, list_len, show_menu, save_line_number; | |
3025 | ||
3026 | if (check_identifier (select_command->name, 1) == 0) | |
3027 | return (EXECUTION_FAILURE); | |
3028 | ||
3029 | save_line_number = line_number; | |
3030 | line_number = select_command->line; | |
3031 | ||
3032 | command_string_index = 0; | |
3033 | print_select_command_head (select_command); | |
3034 | ||
3035 | if (echo_command_at_execute) | |
3036 | xtrace_print_select_command_head (select_command); | |
3037 | ||
3038 | #if 0 | |
3039 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) | |
3040 | #else | |
3041 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3042 | #endif | |
3043 | { | |
3044 | FREE (the_printed_command_except_trap); | |
3045 | the_printed_command_except_trap = savestring (the_printed_command); | |
3046 | } | |
3047 | ||
3048 | retval = run_debug_trap (); | |
3049 | #if defined (DEBUGGER) | |
3050 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3051 | skip the command. */ | |
3052 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3053 | return (EXECUTION_SUCCESS); | |
3054 | #endif | |
3055 | ||
3056 | loop_level++; | |
3057 | identifier = select_command->name->word; | |
3058 | ||
3059 | /* command and arithmetic substitution, parameter and variable expansion, | |
3060 | word splitting, pathname expansion, and quote removal. */ | |
3061 | list = releaser = expand_words_no_vars (select_command->map_list); | |
3062 | list_len = list_length (list); | |
3063 | if (list == 0 || list_len == 0) | |
3064 | { | |
3065 | if (list) | |
3066 | dispose_words (list); | |
3067 | line_number = save_line_number; | |
3068 | return (EXECUTION_SUCCESS); | |
3069 | } | |
3070 | ||
3071 | begin_unwind_frame ("select"); | |
3072 | add_unwind_protect (dispose_words, releaser); | |
3073 | ||
3074 | if (select_command->flags & CMD_IGNORE_RETURN) | |
3075 | select_command->action->flags |= CMD_IGNORE_RETURN; | |
3076 | ||
3077 | retval = EXECUTION_SUCCESS; | |
3078 | show_menu = 1; | |
3079 | ||
3080 | while (1) | |
3081 | { | |
3082 | line_number = select_command->line; | |
3083 | ps3_prompt = get_string_value ("PS3"); | |
3084 | if (ps3_prompt == 0) | |
3085 | ps3_prompt = "#? "; | |
3086 | ||
3087 | QUIT; | |
3088 | selection = select_query (list, list_len, ps3_prompt, show_menu); | |
3089 | QUIT; | |
3090 | if (selection == 0) | |
3091 | { | |
3092 | /* select_query returns EXECUTION_FAILURE if the read builtin | |
3093 | fails, so we want to return failure in this case. */ | |
3094 | retval = EXECUTION_FAILURE; | |
3095 | break; | |
3096 | } | |
3097 | ||
3098 | v = bind_variable (identifier, selection, 0); | |
3099 | if (readonly_p (v) || noassign_p (v)) | |
3100 | { | |
3101 | if (readonly_p (v) && interactive_shell == 0 && posixly_correct) | |
3102 | { | |
3103 | last_command_exit_value = EXECUTION_FAILURE; | |
3104 | jump_to_top_level (FORCE_EOF); | |
3105 | } | |
3106 | else | |
3107 | { | |
3108 | dispose_words (releaser); | |
3109 | discard_unwind_frame ("select"); | |
3110 | loop_level--; | |
3111 | line_number = save_line_number; | |
3112 | return (EXECUTION_FAILURE); | |
3113 | } | |
3114 | } | |
3115 | ||
3116 | retval = execute_command (select_command->action); | |
3117 | ||
3118 | REAP (); | |
3119 | QUIT; | |
3120 | ||
3121 | if (breaking) | |
3122 | { | |
3123 | breaking--; | |
3124 | break; | |
3125 | } | |
3126 | ||
3127 | if (continuing) | |
3128 | { | |
3129 | continuing--; | |
3130 | if (continuing) | |
3131 | break; | |
3132 | } | |
3133 | ||
3134 | #if defined (KSH_COMPATIBLE_SELECT) | |
3135 | show_menu = 0; | |
3136 | selection = get_string_value ("REPLY"); | |
3137 | if (selection && *selection == '\0') | |
3138 | show_menu = 1; | |
3139 | #endif | |
3140 | } | |
3141 | ||
3142 | loop_level--; | |
3143 | line_number = save_line_number; | |
3144 | ||
3145 | dispose_words (releaser); | |
3146 | discard_unwind_frame ("select"); | |
3147 | return (retval); | |
3148 | } | |
3149 | #endif /* SELECT_COMMAND */ | |
3150 | ||
3151 | /* Execute a CASE command. The syntax is: CASE word_desc IN pattern_list ESAC. | |
3152 | The pattern_list is a linked list of pattern clauses; each clause contains | |
3153 | some patterns to compare word_desc against, and an associated command to | |
3154 | execute. */ | |
3155 | static int | |
3156 | execute_case_command (case_command) | |
3157 | CASE_COM *case_command; | |
3158 | { | |
3159 | register WORD_LIST *list; | |
3160 | WORD_LIST *wlist, *es; | |
3161 | PATTERN_LIST *clauses; | |
3162 | char *word, *pattern; | |
3163 | int retval, match, ignore_return, save_line_number; | |
3164 | ||
3165 | save_line_number = line_number; | |
3166 | line_number = case_command->line; | |
3167 | ||
3168 | command_string_index = 0; | |
3169 | print_case_command_head (case_command); | |
3170 | ||
3171 | if (echo_command_at_execute) | |
3172 | xtrace_print_case_command_head (case_command); | |
3173 | ||
3174 | #if 0 | |
3175 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) | |
3176 | #else | |
3177 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3178 | #endif | |
3179 | { | |
3180 | FREE (the_printed_command_except_trap); | |
3181 | the_printed_command_except_trap = savestring (the_printed_command); | |
3182 | } | |
3183 | ||
3184 | retval = run_debug_trap(); | |
3185 | #if defined (DEBUGGER) | |
3186 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3187 | skip the command. */ | |
3188 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3189 | { | |
3190 | line_number = save_line_number; | |
3191 | return (EXECUTION_SUCCESS); | |
3192 | } | |
3193 | #endif | |
3194 | ||
3195 | wlist = expand_word_unsplit (case_command->word, 0); | |
3196 | word = wlist ? string_list (wlist) : savestring (""); | |
3197 | dispose_words (wlist); | |
3198 | ||
3199 | retval = EXECUTION_SUCCESS; | |
3200 | ignore_return = case_command->flags & CMD_IGNORE_RETURN; | |
3201 | ||
3202 | begin_unwind_frame ("case"); | |
3203 | add_unwind_protect ((Function *)xfree, word); | |
3204 | ||
3205 | #define EXIT_CASE() goto exit_case_command | |
3206 | ||
3207 | for (clauses = case_command->clauses; clauses; clauses = clauses->next) | |
3208 | { | |
3209 | QUIT; | |
3210 | for (list = clauses->patterns; list; list = list->next) | |
3211 | { | |
3212 | es = expand_word_leave_quoted (list->word, 0); | |
3213 | ||
3214 | if (es && es->word && es->word->word && *(es->word->word)) | |
3215 | pattern = quote_string_for_globbing (es->word->word, QGLOB_CVTNULL); | |
3216 | else | |
3217 | { | |
3218 | pattern = (char *)xmalloc (1); | |
3219 | pattern[0] = '\0'; | |
3220 | } | |
3221 | ||
3222 | /* Since the pattern does not undergo quote removal (as per | |
3223 | Posix.2, section 3.9.4.3), the strmatch () call must be able | |
3224 | to recognize backslashes as escape characters. */ | |
3225 | match = strmatch (pattern, word, FNMATCH_EXTFLAG|FNMATCH_IGNCASE) != FNM_NOMATCH; | |
3226 | free (pattern); | |
3227 | ||
3228 | dispose_words (es); | |
3229 | ||
3230 | if (match) | |
3231 | { | |
3232 | do | |
3233 | { | |
3234 | if (clauses->action && ignore_return) | |
3235 | clauses->action->flags |= CMD_IGNORE_RETURN; | |
3236 | retval = execute_command (clauses->action); | |
3237 | } | |
3238 | while ((clauses->flags & CASEPAT_FALLTHROUGH) && (clauses = clauses->next)); | |
3239 | if (clauses == 0 || (clauses->flags & CASEPAT_TESTNEXT) == 0) | |
3240 | EXIT_CASE (); | |
3241 | else | |
3242 | break; | |
3243 | } | |
3244 | ||
3245 | QUIT; | |
3246 | } | |
3247 | } | |
3248 | ||
3249 | exit_case_command: | |
3250 | free (word); | |
3251 | discard_unwind_frame ("case"); | |
3252 | line_number = save_line_number; | |
3253 | return (retval); | |
3254 | } | |
3255 | ||
3256 | #define CMD_WHILE 0 | |
3257 | #define CMD_UNTIL 1 | |
3258 | ||
3259 | /* The WHILE command. Syntax: WHILE test DO action; DONE. | |
3260 | Repeatedly execute action while executing test produces | |
3261 | EXECUTION_SUCCESS. */ | |
3262 | static int | |
3263 | execute_while_command (while_command) | |
3264 | WHILE_COM *while_command; | |
3265 | { | |
3266 | return (execute_while_or_until (while_command, CMD_WHILE)); | |
3267 | } | |
3268 | ||
3269 | /* UNTIL is just like WHILE except that the test result is negated. */ | |
3270 | static int | |
3271 | execute_until_command (while_command) | |
3272 | WHILE_COM *while_command; | |
3273 | { | |
3274 | return (execute_while_or_until (while_command, CMD_UNTIL)); | |
3275 | } | |
3276 | ||
3277 | /* The body for both while and until. The only difference between the | |
3278 | two is that the test value is treated differently. TYPE is | |
3279 | CMD_WHILE or CMD_UNTIL. The return value for both commands should | |
3280 | be EXECUTION_SUCCESS if no commands in the body are executed, and | |
3281 | the status of the last command executed in the body otherwise. */ | |
3282 | static int | |
3283 | execute_while_or_until (while_command, type) | |
3284 | WHILE_COM *while_command; | |
3285 | int type; | |
3286 | { | |
3287 | int return_value, body_status; | |
3288 | ||
3289 | body_status = EXECUTION_SUCCESS; | |
3290 | loop_level++; | |
3291 | ||
3292 | while_command->test->flags |= CMD_IGNORE_RETURN; | |
3293 | if (while_command->flags & CMD_IGNORE_RETURN) | |
3294 | while_command->action->flags |= CMD_IGNORE_RETURN; | |
3295 | ||
3296 | while (1) | |
3297 | { | |
3298 | return_value = execute_command (while_command->test); | |
3299 | REAP (); | |
3300 | ||
3301 | /* Need to handle `break' in the test when we would break out of the | |
3302 | loop. The job control code will set `breaking' to loop_level | |
3303 | when a job in a loop is stopped with SIGTSTP. If the stopped job | |
3304 | is in the loop test, `breaking' will not be reset unless we do | |
3305 | this, and the shell will cease to execute commands. */ | |
3306 | if (type == CMD_WHILE && return_value != EXECUTION_SUCCESS) | |
3307 | { | |
3308 | if (breaking) | |
3309 | breaking--; | |
3310 | break; | |
3311 | } | |
3312 | if (type == CMD_UNTIL && return_value == EXECUTION_SUCCESS) | |
3313 | { | |
3314 | if (breaking) | |
3315 | breaking--; | |
3316 | break; | |
3317 | } | |
3318 | ||
3319 | QUIT; | |
3320 | body_status = execute_command (while_command->action); | |
3321 | QUIT; | |
3322 | ||
3323 | if (breaking) | |
3324 | { | |
3325 | breaking--; | |
3326 | break; | |
3327 | } | |
3328 | ||
3329 | if (continuing) | |
3330 | { | |
3331 | continuing--; | |
3332 | if (continuing) | |
3333 | break; | |
3334 | } | |
3335 | } | |
3336 | loop_level--; | |
3337 | ||
3338 | return (body_status); | |
3339 | } | |
3340 | ||
3341 | /* IF test THEN command [ELSE command]. | |
3342 | IF also allows ELIF in the place of ELSE IF, but | |
3343 | the parser makes *that* stupidity transparent. */ | |
3344 | static int | |
3345 | execute_if_command (if_command) | |
3346 | IF_COM *if_command; | |
3347 | { | |
3348 | int return_value, save_line_number; | |
3349 | ||
3350 | save_line_number = line_number; | |
3351 | if_command->test->flags |= CMD_IGNORE_RETURN; | |
3352 | return_value = execute_command (if_command->test); | |
3353 | line_number = save_line_number; | |
3354 | ||
3355 | if (return_value == EXECUTION_SUCCESS) | |
3356 | { | |
3357 | QUIT; | |
3358 | ||
3359 | if (if_command->true_case && (if_command->flags & CMD_IGNORE_RETURN)) | |
3360 | if_command->true_case->flags |= CMD_IGNORE_RETURN; | |
3361 | ||
3362 | return (execute_command (if_command->true_case)); | |
3363 | } | |
3364 | else | |
3365 | { | |
3366 | QUIT; | |
3367 | ||
3368 | if (if_command->false_case && (if_command->flags & CMD_IGNORE_RETURN)) | |
3369 | if_command->false_case->flags |= CMD_IGNORE_RETURN; | |
3370 | ||
3371 | return (execute_command (if_command->false_case)); | |
3372 | } | |
3373 | } | |
3374 | ||
3375 | #if defined (DPAREN_ARITHMETIC) | |
3376 | static int | |
3377 | execute_arith_command (arith_command) | |
3378 | ARITH_COM *arith_command; | |
3379 | { | |
3380 | int expok, save_line_number, retval; | |
3381 | intmax_t expresult; | |
3382 | WORD_LIST *new; | |
3383 | char *exp; | |
3384 | ||
3385 | expresult = 0; | |
3386 | ||
3387 | save_line_number = line_number; | |
3388 | this_command_name = "(("; /* )) */ | |
3389 | line_number = arith_command->line; | |
3390 | /* If we're in a function, update the line number information. */ | |
3391 | if (variable_context && interactive_shell) | |
3392 | line_number -= function_line_number; | |
3393 | ||
3394 | command_string_index = 0; | |
3395 | print_arith_command (arith_command->exp); | |
3396 | ||
3397 | if (signal_in_progress (DEBUG_TRAP) == 0) | |
3398 | { | |
3399 | FREE (the_printed_command_except_trap); | |
3400 | the_printed_command_except_trap = savestring (the_printed_command); | |
3401 | } | |
3402 | ||
3403 | /* Run the debug trap before each arithmetic command, but do it after we | |
3404 | update the line number information and before we expand the various | |
3405 | words in the expression. */ | |
3406 | retval = run_debug_trap (); | |
3407 | #if defined (DEBUGGER) | |
3408 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3409 | skip the command. */ | |
3410 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3411 | { | |
3412 | line_number = save_line_number; | |
3413 | return (EXECUTION_SUCCESS); | |
3414 | } | |
3415 | #endif | |
3416 | ||
3417 | new = expand_words_no_vars (arith_command->exp); | |
3418 | ||
3419 | /* If we're tracing, make a new word list with `((' at the front and `))' | |
3420 | at the back and print it. */ | |
3421 | if (echo_command_at_execute) | |
3422 | xtrace_print_arith_cmd (new); | |
3423 | ||
3424 | if (new) | |
3425 | { | |
3426 | exp = new->next ? string_list (new) : new->word->word; | |
3427 | expresult = evalexp (exp, &expok); | |
3428 | line_number = save_line_number; | |
3429 | if (exp != new->word->word) | |
3430 | free (exp); | |
3431 | dispose_words (new); | |
3432 | } | |
3433 | else | |
3434 | { | |
3435 | expresult = 0; | |
3436 | expok = 1; | |
3437 | } | |
3438 | ||
3439 | if (expok == 0) | |
3440 | return (EXECUTION_FAILURE); | |
3441 | ||
3442 | return (expresult == 0 ? EXECUTION_FAILURE : EXECUTION_SUCCESS); | |
3443 | } | |
3444 | #endif /* DPAREN_ARITHMETIC */ | |
3445 | ||
3446 | #if defined (COND_COMMAND) | |
3447 | ||
3448 | static char * const nullstr = ""; | |
3449 | ||
631b20c6 | 3450 | /* XXX - can COND ever be NULL when this is called? */ |
19baff85 CR |
3451 | static int |
3452 | execute_cond_node (cond) | |
3453 | COND_COM *cond; | |
3454 | { | |
3455 | int result, invert, patmatch, rmatch, mflags, ignore; | |
3456 | char *arg1, *arg2; | |
3457 | ||
3458 | invert = (cond->flags & CMD_INVERT_RETURN); | |
3459 | ignore = (cond->flags & CMD_IGNORE_RETURN); | |
3460 | if (ignore) | |
3461 | { | |
3462 | if (cond->left) | |
3463 | cond->left->flags |= CMD_IGNORE_RETURN; | |
3464 | if (cond->right) | |
3465 | cond->right->flags |= CMD_IGNORE_RETURN; | |
3466 | } | |
3467 | ||
3468 | if (cond->type == COND_EXPR) | |
3469 | result = execute_cond_node (cond->left); | |
3470 | else if (cond->type == COND_OR) | |
3471 | { | |
3472 | result = execute_cond_node (cond->left); | |
3473 | if (result != EXECUTION_SUCCESS) | |
3474 | result = execute_cond_node (cond->right); | |
3475 | } | |
3476 | else if (cond->type == COND_AND) | |
3477 | { | |
3478 | result = execute_cond_node (cond->left); | |
3479 | if (result == EXECUTION_SUCCESS) | |
3480 | result = execute_cond_node (cond->right); | |
3481 | } | |
3482 | else if (cond->type == COND_UNARY) | |
3483 | { | |
3484 | if (ignore) | |
3485 | comsub_ignore_return++; | |
3486 | arg1 = cond_expand_word (cond->left->op, 0); | |
3487 | if (ignore) | |
3488 | comsub_ignore_return--; | |
3489 | if (arg1 == 0) | |
3490 | arg1 = nullstr; | |
3491 | if (echo_command_at_execute) | |
3492 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, (char *)NULL); | |
3493 | result = unary_test (cond->op->word, arg1) ? EXECUTION_SUCCESS : EXECUTION_FAILURE; | |
3494 | if (arg1 != nullstr) | |
3495 | free (arg1); | |
3496 | } | |
3497 | else if (cond->type == COND_BINARY) | |
3498 | { | |
3499 | rmatch = 0; | |
3500 | patmatch = ((cond->op->word[1] == '=') && (cond->op->word[2] == '\0') && | |
3501 | (cond->op->word[0] == '!' || cond->op->word[0] == '=') || | |
3502 | (cond->op->word[0] == '=' && cond->op->word[1] == '\0')); | |
3503 | #if defined (COND_REGEXP) | |
3504 | rmatch = (cond->op->word[0] == '=' && cond->op->word[1] == '~' && | |
3505 | cond->op->word[2] == '\0'); | |
3506 | #endif | |
3507 | ||
3508 | if (ignore) | |
3509 | comsub_ignore_return++; | |
3510 | arg1 = cond_expand_word (cond->left->op, 0); | |
3511 | if (ignore) | |
3512 | comsub_ignore_return--; | |
3513 | if (arg1 == 0) | |
3514 | arg1 = nullstr; | |
3515 | if (ignore) | |
3516 | comsub_ignore_return++; | |
3517 | arg2 = cond_expand_word (cond->right->op, | |
3518 | (rmatch && shell_compatibility_level > 31) ? 2 : (patmatch ? 1 : 0)); | |
3519 | if (ignore) | |
3520 | comsub_ignore_return--; | |
3521 | if (arg2 == 0) | |
3522 | arg2 = nullstr; | |
3523 | ||
3524 | if (echo_command_at_execute) | |
3525 | xtrace_print_cond_term (cond->type, invert, cond->op, arg1, arg2); | |
3526 | ||
3527 | #if defined (COND_REGEXP) | |
3528 | if (rmatch) | |
3529 | { | |
3530 | mflags = SHMAT_PWARN; | |
3531 | #if defined (ARRAY_VARS) | |
3532 | mflags |= SHMAT_SUBEXP; | |
3533 | #endif | |
3534 | ||
3535 | result = sh_regmatch (arg1, arg2, mflags); | |
3536 | } | |
3537 | else | |
3538 | #endif /* COND_REGEXP */ | |
3539 | { | |
3540 | int oe; | |
3541 | oe = extended_glob; | |
3542 | extended_glob = 1; | |
3543 | result = binary_test (cond->op->word, arg1, arg2, TEST_PATMATCH|TEST_ARITHEXP|TEST_LOCALE) | |
3544 | ? EXECUTION_SUCCESS | |
3545 | : EXECUTION_FAILURE; | |
3546 | extended_glob = oe; | |
3547 | } | |
3548 | if (arg1 != nullstr) | |
3549 | free (arg1); | |
3550 | if (arg2 != nullstr) | |
3551 | free (arg2); | |
3552 | } | |
3553 | else | |
3554 | { | |
3555 | command_error ("execute_cond_node", CMDERR_BADTYPE, cond->type, 0); | |
3556 | jump_to_top_level (DISCARD); | |
3557 | result = EXECUTION_FAILURE; | |
3558 | } | |
3559 | ||
3560 | if (invert) | |
3561 | result = (result == EXECUTION_SUCCESS) ? EXECUTION_FAILURE : EXECUTION_SUCCESS; | |
3562 | ||
3563 | return result; | |
3564 | } | |
3565 | ||
3566 | static int | |
3567 | execute_cond_command (cond_command) | |
3568 | COND_COM *cond_command; | |
3569 | { | |
3570 | int retval, save_line_number; | |
3571 | ||
3572 | retval = EXECUTION_SUCCESS; | |
3573 | save_line_number = line_number; | |
3574 | ||
3575 | this_command_name = "[["; | |
3576 | line_number = cond_command->line; | |
3577 | /* If we're in a function, update the line number information. */ | |
3578 | if (variable_context && interactive_shell) | |
3579 | line_number -= function_line_number; | |
3580 | command_string_index = 0; | |
3581 | print_cond_command (cond_command); | |
3582 | ||
3583 | if (signal_in_progress (DEBUG_TRAP) == 0) | |
3584 | { | |
3585 | FREE (the_printed_command_except_trap); | |
3586 | the_printed_command_except_trap = savestring (the_printed_command); | |
3587 | } | |
3588 | ||
3589 | /* Run the debug trap before each conditional command, but do it after we | |
3590 | update the line number information. */ | |
3591 | retval = run_debug_trap (); | |
3592 | #if defined (DEBUGGER) | |
3593 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3594 | skip the command. */ | |
3595 | if (debugging_mode && retval != EXECUTION_SUCCESS) | |
3596 | { | |
3597 | line_number = save_line_number; | |
3598 | return (EXECUTION_SUCCESS); | |
3599 | } | |
3600 | #endif | |
3601 | ||
3602 | #if 0 | |
3603 | debug_print_cond_command (cond_command); | |
3604 | #endif | |
3605 | ||
3606 | last_command_exit_value = retval = execute_cond_node (cond_command); | |
3607 | line_number = save_line_number; | |
3608 | return (retval); | |
3609 | } | |
3610 | #endif /* COND_COMMAND */ | |
3611 | ||
3612 | static void | |
3613 | bind_lastarg (arg) | |
3614 | char *arg; | |
3615 | { | |
3616 | SHELL_VAR *var; | |
3617 | ||
3618 | if (arg == 0) | |
3619 | arg = ""; | |
3620 | var = bind_variable ("_", arg, 0); | |
3621 | VUNSETATTR (var, att_exported); | |
3622 | } | |
3623 | ||
3624 | /* Execute a null command. Fork a subshell if the command uses pipes or is | |
3625 | to be run asynchronously. This handles all the side effects that are | |
3626 | supposed to take place. */ | |
3627 | static int | |
3628 | execute_null_command (redirects, pipe_in, pipe_out, async) | |
3629 | REDIRECT *redirects; | |
3630 | int pipe_in, pipe_out, async; | |
3631 | { | |
3632 | int r; | |
3633 | int forcefork; | |
3634 | REDIRECT *rd; | |
3635 | ||
3636 | for (forcefork = 0, rd = redirects; rd; rd = rd->next) | |
3637 | forcefork += rd->rflags & REDIR_VARASSIGN; | |
3638 | ||
3639 | if (forcefork || pipe_in != NO_PIPE || pipe_out != NO_PIPE || async) | |
3640 | { | |
3641 | /* We have a null command, but we really want a subshell to take | |
3642 | care of it. Just fork, do piping and redirections, and exit. */ | |
3643 | if (make_child ((char *)NULL, async) == 0) | |
3644 | { | |
3645 | /* Cancel traps, in trap.c. */ | |
3646 | restore_original_signals (); /* XXX */ | |
3647 | ||
3648 | do_piping (pipe_in, pipe_out); | |
3649 | ||
3650 | #if defined (COPROCESS_SUPPORT) | |
3651 | coproc_closeall (); | |
3652 | #endif | |
3653 | ||
3654 | subshell_environment = 0; | |
3655 | if (async) | |
3656 | subshell_environment |= SUBSHELL_ASYNC; | |
3657 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
3658 | subshell_environment |= SUBSHELL_PIPE; | |
3659 | ||
3660 | if (do_redirections (redirects, RX_ACTIVE) == 0) | |
3661 | exit (EXECUTION_SUCCESS); | |
3662 | else | |
3663 | exit (EXECUTION_FAILURE); | |
3664 | } | |
3665 | else | |
3666 | { | |
3667 | close_pipes (pipe_in, pipe_out); | |
3668 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
3669 | unlink_fifo_list (); | |
3670 | #endif | |
3671 | return (EXECUTION_SUCCESS); | |
3672 | } | |
3673 | } | |
3674 | else | |
3675 | { | |
3676 | /* Even if there aren't any command names, pretend to do the | |
3677 | redirections that are specified. The user expects the side | |
3678 | effects to take place. If the redirections fail, then return | |
3679 | failure. Otherwise, if a command substitution took place while | |
3680 | expanding the command or a redirection, return the value of that | |
3681 | substitution. Otherwise, return EXECUTION_SUCCESS. */ | |
3682 | ||
3683 | r = do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE); | |
3684 | cleanup_redirects (redirection_undo_list); | |
3685 | redirection_undo_list = (REDIRECT *)NULL; | |
3686 | ||
3687 | if (r != 0) | |
3688 | return (EXECUTION_FAILURE); | |
3689 | else if (last_command_subst_pid != NO_PID) | |
3690 | return (last_command_exit_value); | |
3691 | else | |
3692 | return (EXECUTION_SUCCESS); | |
3693 | } | |
3694 | } | |
3695 | ||
3696 | /* This is a hack to suppress word splitting for assignment statements | |
3697 | given as arguments to builtins with the ASSIGNMENT_BUILTIN flag set. */ | |
3698 | static void | |
3699 | fix_assignment_words (words) | |
3700 | WORD_LIST *words; | |
3701 | { | |
3702 | WORD_LIST *w, *wcmd; | |
3703 | struct builtin *b; | |
3704 | int assoc; | |
3705 | ||
3706 | if (words == 0) | |
3707 | return; | |
3708 | ||
3709 | b = 0; | |
3710 | assoc = 0; | |
3711 | ||
3712 | wcmd = words; | |
3713 | for (w = words; w; w = w->next) | |
3714 | if (w->word->flags & W_ASSIGNMENT) | |
3715 | { | |
3716 | if (b == 0) | |
3717 | { | |
122f603c CR |
3718 | /* Posix (post-2008) says that `command' doesn't change whether |
3719 | or not the builtin it shadows is a `declaration command', even | |
3720 | though it removes other special builtin properties. In Posix | |
3721 | mode, we skip over one or more instances of `command' and | |
3722 | deal with the next word as the assignment builtin. */ | |
19baff85 CR |
3723 | while (posixly_correct && wcmd && wcmd->word && wcmd->word->word && STREQ (wcmd->word->word, "command")) |
3724 | wcmd = wcmd->next; | |
3725 | b = builtin_address_internal (wcmd->word->word, 0); | |
3726 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) | |
3727 | return; | |
3728 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) | |
3729 | wcmd->word->flags |= W_ASSNBLTIN; | |
3730 | } | |
3731 | w->word->flags |= (W_NOSPLIT|W_NOGLOB|W_TILDEEXP|W_ASSIGNARG); | |
3732 | #if defined (ARRAY_VARS) | |
3733 | if (assoc) | |
3734 | w->word->flags |= W_ASSIGNASSOC; | |
3735 | #endif | |
3736 | } | |
3737 | #if defined (ARRAY_VARS) | |
3738 | /* Note that we saw an associative array option to a builtin that takes | |
3739 | assignment statements. This is a bit of a kludge. */ | |
3740 | else if (w->word->word[0] == '-' && strchr (w->word->word, 'A')) | |
3741 | { | |
3742 | if (b == 0) | |
3743 | { | |
122f603c CR |
3744 | while (posixly_correct && wcmd && wcmd->word && wcmd->word->word && STREQ (wcmd->word->word, "command")) |
3745 | wcmd = wcmd->next; | |
19baff85 CR |
3746 | b = builtin_address_internal (wcmd->word->word, 0); |
3747 | if (b == 0 || (b->flags & ASSIGNMENT_BUILTIN) == 0) | |
3748 | return; | |
3749 | else if (b && (b->flags & ASSIGNMENT_BUILTIN)) | |
3750 | wcmd->word->flags |= W_ASSNBLTIN; | |
3751 | } | |
3752 | if (wcmd->word->flags & W_ASSNBLTIN) | |
3753 | assoc = 1; | |
3754 | } | |
3755 | #endif | |
3756 | } | |
3757 | ||
3758 | /* Return 1 if the file found by searching $PATH for PATHNAME, defaulting | |
3759 | to PATHNAME, is a directory. Used by the autocd code below. */ | |
3760 | static int | |
3761 | is_dirname (pathname) | |
3762 | char *pathname; | |
3763 | { | |
3764 | char *temp; | |
631b20c6 CR |
3765 | int ret; |
3766 | ||
19baff85 | 3767 | temp = search_for_command (pathname); |
631b20c6 CR |
3768 | ret = (temp ? file_isdir (temp) : file_isdir (pathname)); |
3769 | free (temp); | |
3770 | return ret; | |
19baff85 CR |
3771 | } |
3772 | ||
3773 | /* The meaty part of all the executions. We have to start hacking the | |
3774 | real execution of commands here. Fork a process, set things up, | |
3775 | execute the command. */ | |
3776 | static int | |
3777 | execute_simple_command (simple_command, pipe_in, pipe_out, async, fds_to_close) | |
3778 | SIMPLE_COM *simple_command; | |
3779 | int pipe_in, pipe_out, async; | |
3780 | struct fd_bitmap *fds_to_close; | |
3781 | { | |
3782 | WORD_LIST *words, *lastword; | |
3783 | char *command_line, *lastarg, *temp; | |
3784 | int first_word_quoted, result, builtin_is_special, already_forked, dofork; | |
3785 | pid_t old_last_async_pid; | |
3786 | sh_builtin_func_t *builtin; | |
3787 | SHELL_VAR *func; | |
3788 | volatile int old_builtin, old_command_builtin; | |
3789 | ||
3790 | result = EXECUTION_SUCCESS; | |
3791 | special_builtin_failed = builtin_is_special = 0; | |
3792 | command_line = (char *)0; | |
3793 | ||
3794 | QUIT; | |
3795 | ||
3796 | /* If we're in a function, update the line number information. */ | |
3797 | if (variable_context && interactive_shell && sourcelevel == 0) | |
3798 | line_number -= function_line_number; | |
3799 | ||
3800 | /* Remember what this command line looks like at invocation. */ | |
3801 | command_string_index = 0; | |
3802 | print_simple_command (simple_command); | |
3803 | ||
3804 | #if 0 | |
3805 | if (signal_in_progress (DEBUG_TRAP) == 0 && (this_command_name == 0 || (STREQ (this_command_name, "trap") == 0))) | |
3806 | #else | |
3807 | if (signal_in_progress (DEBUG_TRAP) == 0 && running_trap == 0) | |
3808 | #endif | |
3809 | { | |
3810 | FREE (the_printed_command_except_trap); | |
3811 | the_printed_command_except_trap = the_printed_command ? savestring (the_printed_command) : (char *)0; | |
3812 | } | |
3813 | ||
3814 | /* Run the debug trap before each simple command, but do it after we | |
3815 | update the line number information. */ | |
3816 | result = run_debug_trap (); | |
3817 | #if defined (DEBUGGER) | |
3818 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
3819 | skip the command. */ | |
3820 | if (debugging_mode && result != EXECUTION_SUCCESS) | |
3821 | return (EXECUTION_SUCCESS); | |
3822 | #endif | |
3823 | ||
3824 | first_word_quoted = | |
3825 | simple_command->words ? (simple_command->words->word->flags & W_QUOTED) : 0; | |
3826 | ||
3827 | last_command_subst_pid = NO_PID; | |
3828 | old_last_async_pid = last_asynchronous_pid; | |
3829 | ||
3830 | already_forked = dofork = 0; | |
3831 | ||
3832 | /* If we're in a pipeline or run in the background, set DOFORK so we | |
3833 | make the child early, before word expansion. This keeps assignment | |
3834 | statements from affecting the parent shell's environment when they | |
3835 | should not. */ | |
3836 | dofork = pipe_in != NO_PIPE || pipe_out != NO_PIPE || async; | |
3837 | ||
3838 | /* Something like `%2 &' should restart job 2 in the background, not cause | |
3839 | the shell to fork here. */ | |
3840 | if (dofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE && | |
3841 | simple_command->words && simple_command->words->word && | |
3842 | simple_command->words->word->word && | |
3843 | (simple_command->words->word->word[0] == '%')) | |
3844 | dofork = 0; | |
3845 | ||
3846 | if (dofork) | |
3847 | { | |
3848 | /* Do this now, because execute_disk_command will do it anyway in the | |
3849 | vast majority of cases. */ | |
3850 | maybe_make_export_env (); | |
3851 | ||
3852 | /* Don't let a DEBUG trap overwrite the command string to be saved with | |
3853 | the process/job associated with this child. */ | |
3854 | if (make_child (savestring (the_printed_command_except_trap), async) == 0) | |
3855 | { | |
3856 | already_forked = 1; | |
3857 | simple_command->flags |= CMD_NO_FORK; | |
3858 | ||
3859 | subshell_environment = SUBSHELL_FORK; | |
3860 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
3861 | subshell_environment |= SUBSHELL_PIPE; | |
3862 | if (async) | |
3863 | subshell_environment |= SUBSHELL_ASYNC; | |
3864 | ||
3865 | /* We need to do this before piping to handle some really | |
3866 | pathological cases where one of the pipe file descriptors | |
3867 | is < 2. */ | |
3868 | if (fds_to_close) | |
3869 | close_fd_bitmap (fds_to_close); | |
3870 | ||
3871 | do_piping (pipe_in, pipe_out); | |
3872 | pipe_in = pipe_out = NO_PIPE; | |
3873 | #if defined (COPROCESS_SUPPORT) | |
3874 | coproc_closeall (); | |
3875 | #endif | |
3876 | ||
3877 | last_asynchronous_pid = old_last_async_pid; | |
3878 | } | |
3879 | else | |
3880 | { | |
3881 | /* Don't let simple commands that aren't the last command in a | |
3882 | pipeline change $? for the rest of the pipeline (or at all). */ | |
3883 | if (pipe_out != NO_PIPE) | |
3884 | result = last_command_exit_value; | |
3885 | close_pipes (pipe_in, pipe_out); | |
3886 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
3887 | unlink_fifo_list (); | |
3888 | #endif | |
3889 | command_line = (char *)NULL; /* don't free this. */ | |
3890 | bind_lastarg ((char *)NULL); | |
3891 | return (result); | |
3892 | } | |
3893 | } | |
3894 | ||
3895 | /* If we are re-running this as the result of executing the `command' | |
3896 | builtin, do not expand the command words a second time. */ | |
3897 | if ((simple_command->flags & CMD_INHIBIT_EXPANSION) == 0) | |
3898 | { | |
3899 | current_fds_to_close = fds_to_close; | |
3900 | fix_assignment_words (simple_command->words); | |
3901 | /* Pass the ignore return flag down to command substitutions */ | |
3902 | if (simple_command->flags & CMD_IGNORE_RETURN) /* XXX */ | |
3903 | comsub_ignore_return++; | |
3904 | words = expand_words (simple_command->words); | |
3905 | if (simple_command->flags & CMD_IGNORE_RETURN) | |
3906 | comsub_ignore_return--; | |
3907 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
3908 | } | |
3909 | else | |
3910 | words = copy_word_list (simple_command->words); | |
3911 | ||
3912 | /* It is possible for WORDS not to have anything left in it. | |
3913 | Perhaps all the words consisted of `$foo', and there was | |
3914 | no variable `$foo'. */ | |
3915 | if (words == 0) | |
3916 | { | |
3917 | this_command_name = 0; | |
3918 | result = execute_null_command (simple_command->redirects, | |
3919 | pipe_in, pipe_out, | |
3920 | already_forked ? 0 : async); | |
3921 | if (already_forked) | |
3922 | exit (result); | |
3923 | else | |
3924 | { | |
3925 | bind_lastarg ((char *)NULL); | |
3926 | set_pipestatus_from_exit (result); | |
3927 | return (result); | |
3928 | } | |
3929 | } | |
3930 | ||
3931 | lastarg = (char *)NULL; | |
3932 | ||
3933 | begin_unwind_frame ("simple-command"); | |
3934 | ||
3935 | if (echo_command_at_execute) | |
3936 | xtrace_print_word_list (words, 1); | |
3937 | ||
3938 | builtin = (sh_builtin_func_t *)NULL; | |
3939 | func = (SHELL_VAR *)NULL; | |
3940 | if ((simple_command->flags & CMD_NO_FUNCTIONS) == 0) | |
3941 | { | |
3942 | /* Posix.2 says special builtins are found before functions. We | |
3943 | don't set builtin_is_special anywhere other than here, because | |
3944 | this path is followed only when the `command' builtin is *not* | |
3945 | being used, and we don't want to exit the shell if a special | |
3946 | builtin executed with `command builtin' fails. `command' is not | |
3947 | a special builtin. */ | |
3948 | if (posixly_correct) | |
3949 | { | |
3950 | builtin = find_special_builtin (words->word->word); | |
3951 | if (builtin) | |
3952 | builtin_is_special = 1; | |
3953 | } | |
3954 | if (builtin == 0) | |
3955 | func = find_function (words->word->word); | |
3956 | } | |
3957 | ||
3958 | /* In POSIX mode, assignment errors in the temporary environment cause a | |
3959 | non-interactive shell to exit. */ | |
3960 | if (builtin_is_special && interactive_shell == 0 && tempenv_assign_error) | |
3961 | { | |
3962 | last_command_exit_value = EXECUTION_FAILURE; | |
3963 | jump_to_top_level (ERREXIT); | |
3964 | } | |
3965 | ||
3966 | add_unwind_protect (dispose_words, words); | |
3967 | QUIT; | |
3968 | ||
3969 | /* Bind the last word in this command to "$_" after execution. */ | |
3970 | for (lastword = words; lastword->next; lastword = lastword->next) | |
3971 | ; | |
3972 | lastarg = lastword->word->word; | |
3973 | ||
3974 | #if defined (JOB_CONTROL) | |
3975 | /* Is this command a job control related thing? */ | |
3976 | if (words->word->word[0] == '%' && already_forked == 0) | |
3977 | { | |
3978 | this_command_name = async ? "bg" : "fg"; | |
3979 | last_shell_builtin = this_shell_builtin; | |
3980 | this_shell_builtin = builtin_address (this_command_name); | |
3981 | result = (*this_shell_builtin) (words); | |
3982 | goto return_result; | |
3983 | } | |
3984 | ||
3985 | /* One other possiblilty. The user may want to resume an existing job. | |
3986 | If they do, find out whether this word is a candidate for a running | |
3987 | job. */ | |
3988 | if (job_control && already_forked == 0 && async == 0 && | |
3989 | !first_word_quoted && | |
3990 | !words->next && | |
3991 | words->word->word[0] && | |
3992 | !simple_command->redirects && | |
3993 | pipe_in == NO_PIPE && | |
3994 | pipe_out == NO_PIPE && | |
3995 | (temp = get_string_value ("auto_resume"))) | |
3996 | { | |
3997 | int job, jflags, started_status; | |
3998 | ||
3999 | jflags = JM_STOPPED|JM_FIRSTMATCH; | |
4000 | if (STREQ (temp, "exact")) | |
4001 | jflags |= JM_EXACT; | |
4002 | else if (STREQ (temp, "substring")) | |
4003 | jflags |= JM_SUBSTRING; | |
4004 | else | |
4005 | jflags |= JM_PREFIX; | |
4006 | job = get_job_by_name (words->word->word, jflags); | |
4007 | if (job != NO_JOB) | |
4008 | { | |
4009 | run_unwind_frame ("simple-command"); | |
4010 | this_command_name = "fg"; | |
4011 | last_shell_builtin = this_shell_builtin; | |
4012 | this_shell_builtin = builtin_address ("fg"); | |
4013 | ||
4014 | started_status = start_job (job, 1); | |
4015 | return ((started_status < 0) ? EXECUTION_FAILURE : started_status); | |
4016 | } | |
4017 | } | |
4018 | #endif /* JOB_CONTROL */ | |
4019 | ||
4020 | run_builtin: | |
4021 | /* Remember the name of this command globally. */ | |
4022 | this_command_name = words->word->word; | |
4023 | ||
4024 | QUIT; | |
4025 | ||
4026 | /* This command could be a shell builtin or a user-defined function. | |
4027 | We have already found special builtins by this time, so we do not | |
4028 | set builtin_is_special. If this is a function or builtin, and we | |
4029 | have pipes, then fork a subshell in here. Otherwise, just execute | |
4030 | the command directly. */ | |
4031 | if (func == 0 && builtin == 0) | |
4032 | builtin = find_shell_builtin (this_command_name); | |
4033 | ||
4034 | last_shell_builtin = this_shell_builtin; | |
4035 | this_shell_builtin = builtin; | |
4036 | ||
4037 | if (builtin || func) | |
4038 | { | |
4039 | if (builtin) | |
4040 | { | |
4041 | old_builtin = executing_builtin; | |
4042 | old_command_builtin = executing_command_builtin; | |
4043 | unwind_protect_int (executing_builtin); /* modified in execute_builtin */ | |
4044 | unwind_protect_int (executing_command_builtin); /* ditto */ | |
4045 | } | |
4046 | if (already_forked) | |
4047 | { | |
4048 | /* reset_terminating_signals (); */ /* XXX */ | |
4049 | /* Reset the signal handlers in the child, but don't free the | |
4050 | trap strings. Set a flag noting that we have to free the | |
4051 | trap strings if we run trap to change a signal disposition. */ | |
4052 | reset_signal_handlers (); | |
4053 | subshell_environment |= SUBSHELL_RESETTRAP; | |
4054 | ||
4055 | if (async) | |
4056 | { | |
4057 | if ((simple_command->flags & CMD_STDIN_REDIR) && | |
4058 | pipe_in == NO_PIPE && | |
4059 | (stdin_redirects (simple_command->redirects) == 0)) | |
4060 | async_redirect_stdin (); | |
4061 | setup_async_signals (); | |
4062 | } | |
4063 | ||
4064 | subshell_level++; | |
4065 | execute_subshell_builtin_or_function | |
4066 | (words, simple_command->redirects, builtin, func, | |
4067 | pipe_in, pipe_out, async, fds_to_close, | |
4068 | simple_command->flags); | |
4069 | subshell_level--; | |
4070 | } | |
4071 | else | |
4072 | { | |
4073 | result = execute_builtin_or_function | |
4074 | (words, builtin, func, simple_command->redirects, fds_to_close, | |
4075 | simple_command->flags); | |
4076 | if (builtin) | |
4077 | { | |
4078 | if (result > EX_SHERRBASE) | |
4079 | { | |
4080 | result = builtin_status (result); | |
4081 | if (builtin_is_special) | |
4082 | special_builtin_failed = 1; | |
4083 | } | |
4084 | /* In POSIX mode, if there are assignment statements preceding | |
4085 | a special builtin, they persist after the builtin | |
4086 | completes. */ | |
4087 | if (posixly_correct && builtin_is_special && temporary_env) | |
4088 | merge_temporary_env (); | |
4089 | } | |
4090 | else /* function */ | |
4091 | { | |
4092 | if (result == EX_USAGE) | |
4093 | result = EX_BADUSAGE; | |
4094 | else if (result > EX_SHERRBASE) | |
4095 | result = EXECUTION_FAILURE; | |
4096 | } | |
4097 | ||
4098 | set_pipestatus_from_exit (result); | |
4099 | ||
4100 | goto return_result; | |
4101 | } | |
4102 | } | |
4103 | ||
4104 | if (autocd && interactive && words->word && is_dirname (words->word->word)) | |
4105 | { | |
4106 | words = make_word_list (make_word ("cd"), words); | |
4107 | xtrace_print_word_list (words, 0); | |
4108 | goto run_builtin; | |
4109 | } | |
4110 | ||
4111 | if (command_line == 0) | |
4112 | command_line = savestring (the_printed_command_except_trap); | |
4113 | ||
4114 | #if defined (PROCESS_SUBSTITUTION) | |
4115 | if ((subshell_environment & SUBSHELL_COMSUB) && (simple_command->flags & CMD_NO_FORK) && fifos_pending() > 0) | |
4116 | simple_command->flags &= ~CMD_NO_FORK; | |
4117 | #endif | |
4118 | ||
4119 | result = execute_disk_command (words, simple_command->redirects, command_line, | |
4120 | pipe_in, pipe_out, async, fds_to_close, | |
4121 | simple_command->flags); | |
4122 | ||
4123 | return_result: | |
4124 | bind_lastarg (lastarg); | |
4125 | FREE (command_line); | |
4126 | dispose_words (words); | |
4127 | if (builtin) | |
4128 | { | |
4129 | executing_builtin = old_builtin; | |
4130 | executing_command_builtin = old_command_builtin; | |
4131 | } | |
4132 | discard_unwind_frame ("simple-command"); | |
4133 | this_command_name = (char *)NULL; /* points to freed memory now */ | |
4134 | return (result); | |
4135 | } | |
4136 | ||
4137 | /* Translate the special builtin exit statuses. We don't really need a | |
4138 | function for this; it's a placeholder for future work. */ | |
4139 | static int | |
4140 | builtin_status (result) | |
4141 | int result; | |
4142 | { | |
4143 | int r; | |
4144 | ||
4145 | switch (result) | |
4146 | { | |
4147 | case EX_USAGE: | |
4148 | r = EX_BADUSAGE; | |
4149 | break; | |
4150 | case EX_REDIRFAIL: | |
4151 | case EX_BADSYNTAX: | |
4152 | case EX_BADASSIGN: | |
4153 | case EX_EXPFAIL: | |
4154 | r = EXECUTION_FAILURE; | |
4155 | break; | |
4156 | default: | |
4157 | r = EXECUTION_SUCCESS; | |
4158 | break; | |
4159 | } | |
4160 | return (r); | |
4161 | } | |
4162 | ||
4163 | static int | |
4164 | execute_builtin (builtin, words, flags, subshell) | |
4165 | sh_builtin_func_t *builtin; | |
4166 | WORD_LIST *words; | |
4167 | int flags, subshell; | |
4168 | { | |
4169 | int old_e_flag, result, eval_unwind; | |
4170 | int isbltinenv; | |
4171 | char *error_trap; | |
4172 | ||
4173 | error_trap = 0; | |
4174 | old_e_flag = exit_immediately_on_error; | |
4175 | /* The eval builtin calls parse_and_execute, which does not know about | |
4176 | the setting of flags, and always calls the execution functions with | |
4177 | flags that will exit the shell on an error if -e is set. If the | |
4178 | eval builtin is being called, and we're supposed to ignore the exit | |
4179 | value of the command, we turn the -e flag off ourselves and disable | |
4180 | the ERR trap, then restore them when the command completes. This is | |
4181 | also a problem (as below) for the command and source/. builtins. */ | |
4182 | if (subshell == 0 && (flags & CMD_IGNORE_RETURN) && | |
4183 | (builtin == eval_builtin || builtin == command_builtin || builtin == source_builtin)) | |
4184 | { | |
4185 | begin_unwind_frame ("eval_builtin"); | |
4186 | unwind_protect_int (exit_immediately_on_error); | |
4187 | error_trap = TRAP_STRING (ERROR_TRAP); | |
4188 | if (error_trap) | |
4189 | { | |
4190 | error_trap = savestring (error_trap); | |
4191 | add_unwind_protect (xfree, error_trap); | |
4192 | add_unwind_protect (set_error_trap, error_trap); | |
4193 | restore_default_signal (ERROR_TRAP); | |
4194 | } | |
4195 | exit_immediately_on_error = 0; | |
4196 | eval_unwind = 1; | |
4197 | } | |
4198 | else | |
4199 | eval_unwind = 0; | |
4200 | ||
4201 | /* The temporary environment for a builtin is supposed to apply to | |
4202 | all commands executed by that builtin. Currently, this is a | |
4203 | problem only with the `unset', `source' and `eval' builtins. */ | |
4204 | ||
4205 | isbltinenv = (builtin == source_builtin || builtin == eval_builtin || builtin == unset_builtin); | |
4206 | ||
4207 | if (isbltinenv) | |
4208 | { | |
4209 | if (subshell == 0) | |
4210 | begin_unwind_frame ("builtin_env"); | |
4211 | ||
4212 | if (temporary_env) | |
4213 | { | |
4214 | push_scope (VC_BLTNENV, temporary_env); | |
4215 | if (subshell == 0) | |
4216 | add_unwind_protect (pop_scope, (flags & CMD_COMMAND_BUILTIN) ? 0 : "1"); | |
4217 | temporary_env = (HASH_TABLE *)NULL; | |
4218 | } | |
4219 | } | |
4220 | ||
4221 | /* `return' does a longjmp() back to a saved environment in execute_function. | |
4222 | If a variable assignment list preceded the command, and the shell is | |
4223 | running in POSIX mode, we need to merge that into the shell_variables | |
4224 | table, since `return' is a POSIX special builtin. */ | |
4225 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
4226 | { | |
4227 | begin_unwind_frame ("return_temp_env"); | |
4228 | add_unwind_protect (merge_temporary_env, (char *)NULL); | |
4229 | } | |
4230 | ||
4231 | executing_builtin++; | |
4232 | executing_command_builtin |= builtin == command_builtin; | |
4233 | result = ((*builtin) (words->next)); | |
4234 | ||
4235 | /* This shouldn't happen, but in case `return' comes back instead of | |
4236 | longjmp'ing, we need to unwind. */ | |
4237 | if (posixly_correct && subshell == 0 && builtin == return_builtin && temporary_env) | |
4238 | discard_unwind_frame ("return_temp_env"); | |
4239 | ||
4240 | if (subshell == 0 && isbltinenv) | |
4241 | run_unwind_frame ("builtin_env"); | |
4242 | ||
4243 | if (eval_unwind) | |
4244 | { | |
4245 | exit_immediately_on_error += old_e_flag; | |
4246 | if (error_trap) | |
4247 | { | |
4248 | set_error_trap (error_trap); | |
4249 | xfree (error_trap); | |
4250 | } | |
4251 | discard_unwind_frame ("eval_builtin"); | |
4252 | } | |
4253 | ||
4254 | return (result); | |
4255 | } | |
4256 | ||
4257 | static int | |
4258 | execute_function (var, words, flags, fds_to_close, async, subshell) | |
4259 | SHELL_VAR *var; | |
4260 | WORD_LIST *words; | |
4261 | int flags; | |
4262 | struct fd_bitmap *fds_to_close; | |
4263 | int async, subshell; | |
4264 | { | |
4265 | int return_val, result; | |
4266 | COMMAND *tc, *fc, *save_current; | |
4267 | char *debug_trap, *error_trap, *return_trap; | |
4268 | #if defined (ARRAY_VARS) | |
4269 | SHELL_VAR *funcname_v, *nfv, *bash_source_v, *bash_lineno_v; | |
4270 | ARRAY *funcname_a; | |
4271 | volatile ARRAY *bash_source_a; | |
4272 | volatile ARRAY *bash_lineno_a; | |
4273 | #endif | |
4274 | FUNCTION_DEF *shell_fn; | |
4275 | char *sfile, *t; | |
4276 | ||
4277 | USE_VAR(fc); | |
4278 | ||
4279 | if (funcnest_max > 0 && funcnest >= funcnest_max) | |
4280 | { | |
122f603c | 4281 | internal_error (_("%s: maximum function nesting level exceeded (%d)"), var->name, funcnest); |
19baff85 CR |
4282 | funcnest = 0; /* XXX - should we reset it somewhere else? */ |
4283 | jump_to_top_level (DISCARD); | |
4284 | } | |
4285 | ||
4286 | #if defined (ARRAY_VARS) | |
4287 | GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a); | |
4288 | GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a); | |
4289 | GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a); | |
4290 | #endif | |
4291 | ||
4292 | tc = (COMMAND *)copy_command (function_cell (var)); | |
4293 | if (tc && (flags & CMD_IGNORE_RETURN)) | |
4294 | tc->flags |= CMD_IGNORE_RETURN; | |
4295 | ||
4296 | if (subshell == 0) | |
4297 | { | |
4298 | begin_unwind_frame ("function_calling"); | |
4299 | push_context (var->name, subshell, temporary_env); | |
4300 | add_unwind_protect (pop_context, (char *)NULL); | |
4301 | unwind_protect_int (line_number); | |
4302 | unwind_protect_int (return_catch_flag); | |
4303 | unwind_protect_jmp_buf (return_catch); | |
4304 | add_unwind_protect (dispose_command, (char *)tc); | |
4305 | unwind_protect_pointer (this_shell_function); | |
4306 | unwind_protect_int (loop_level); | |
4307 | unwind_protect_int (funcnest); | |
4308 | } | |
4309 | else | |
4310 | push_context (var->name, subshell, temporary_env); /* don't unwind-protect for subshells */ | |
4311 | ||
4312 | temporary_env = (HASH_TABLE *)NULL; | |
4313 | ||
4314 | this_shell_function = var; | |
4315 | make_funcname_visible (1); | |
4316 | ||
4317 | debug_trap = TRAP_STRING(DEBUG_TRAP); | |
4318 | error_trap = TRAP_STRING(ERROR_TRAP); | |
4319 | return_trap = TRAP_STRING(RETURN_TRAP); | |
4320 | ||
4321 | /* The order of the unwind protects for debug_trap, error_trap and | |
4322 | return_trap is important here! unwind-protect commands are run | |
4323 | in reverse order of registration. If this causes problems, take | |
4324 | out the xfree unwind-protect calls and live with the small memory leak. */ | |
4325 | ||
4326 | /* function_trace_mode != 0 means that all functions inherit the DEBUG trap. | |
4327 | if the function has the trace attribute set, it inherits the DEBUG trap */ | |
4328 | if (debug_trap && ((trace_p (var) == 0) && function_trace_mode == 0)) | |
4329 | { | |
4330 | if (subshell == 0) | |
4331 | { | |
4332 | debug_trap = savestring (debug_trap); | |
4333 | add_unwind_protect (xfree, debug_trap); | |
4334 | add_unwind_protect (set_debug_trap, debug_trap); | |
4335 | } | |
4336 | restore_default_signal (DEBUG_TRAP); | |
4337 | } | |
4338 | ||
4339 | /* error_trace_mode != 0 means that functions inherit the ERR trap. */ | |
4340 | if (error_trap && error_trace_mode == 0) | |
4341 | { | |
4342 | if (subshell == 0) | |
4343 | { | |
4344 | error_trap = savestring (error_trap); | |
4345 | add_unwind_protect (xfree, error_trap); | |
4346 | add_unwind_protect (set_error_trap, error_trap); | |
4347 | } | |
4348 | restore_default_signal (ERROR_TRAP); | |
4349 | } | |
4350 | ||
4351 | /* Shell functions inherit the RETURN trap if function tracing is on | |
4352 | globally or on individually for this function. */ | |
4353 | #if 0 | |
4354 | if (return_trap && ((trace_p (var) == 0) && function_trace_mode == 0)) | |
4355 | #else | |
4356 | if (return_trap && (signal_in_progress (DEBUG_TRAP) || ((trace_p (var) == 0) && function_trace_mode == 0))) | |
4357 | #endif | |
4358 | { | |
4359 | if (subshell == 0) | |
4360 | { | |
4361 | return_trap = savestring (return_trap); | |
4362 | add_unwind_protect (xfree, return_trap); | |
4363 | add_unwind_protect (set_return_trap, return_trap); | |
4364 | } | |
4365 | restore_default_signal (RETURN_TRAP); | |
4366 | } | |
4367 | ||
4368 | funcnest++; | |
4369 | #if defined (ARRAY_VARS) | |
4370 | /* This is quite similar to the code in shell.c and elsewhere. */ | |
4371 | shell_fn = find_function_def (this_shell_function->name); | |
4372 | sfile = shell_fn ? shell_fn->source_file : ""; | |
4373 | array_push ((ARRAY *)funcname_a, this_shell_function->name); | |
4374 | ||
4375 | array_push ((ARRAY *)bash_source_a, sfile); | |
4376 | t = itos (executing_line_number ()); | |
4377 | array_push ((ARRAY *)bash_lineno_a, t); | |
4378 | free (t); | |
4379 | #endif | |
4380 | ||
4381 | /* The temporary environment for a function is supposed to apply to | |
4382 | all commands executed within the function body. */ | |
4383 | ||
4384 | remember_args (words->next, 1); | |
4385 | ||
4386 | /* Update BASH_ARGV and BASH_ARGC */ | |
4387 | if (debugging_mode) | |
4388 | push_args (words->next); | |
4389 | ||
4390 | /* Number of the line on which the function body starts. */ | |
4391 | line_number = function_line_number = tc->line; | |
4392 | ||
4393 | #if defined (JOB_CONTROL) | |
4394 | if (subshell) | |
4395 | stop_pipeline (async, (COMMAND *)NULL); | |
4396 | #endif | |
4397 | ||
4398 | fc = tc; | |
4399 | ||
4400 | return_catch_flag++; | |
4401 | return_val = setjmp (return_catch); | |
4402 | ||
4403 | if (return_val) | |
4404 | { | |
4405 | result = return_catch_value; | |
4406 | /* Run the RETURN trap in the function's context. */ | |
4407 | save_current = currently_executing_command; | |
4408 | run_return_trap (); | |
4409 | currently_executing_command = save_current; | |
4410 | } | |
4411 | else | |
4412 | { | |
4413 | /* Run the debug trap here so we can trap at the start of a function's | |
4414 | execution rather than the execution of the body's first command. */ | |
4415 | showing_function_line = 1; | |
4416 | save_current = currently_executing_command; | |
4417 | result = run_debug_trap (); | |
4418 | #if defined (DEBUGGER) | |
4419 | /* In debugging mode, if the DEBUG trap returns a non-zero status, we | |
4420 | skip the command. */ | |
4421 | if (debugging_mode == 0 || result == EXECUTION_SUCCESS) | |
4422 | { | |
4423 | showing_function_line = 0; | |
4424 | currently_executing_command = save_current; | |
4425 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
4426 | ||
4427 | /* Run the RETURN trap in the function's context */ | |
4428 | save_current = currently_executing_command; | |
4429 | run_return_trap (); | |
4430 | currently_executing_command = save_current; | |
4431 | } | |
4432 | #else | |
4433 | result = execute_command_internal (fc, 0, NO_PIPE, NO_PIPE, fds_to_close); | |
4434 | ||
4435 | save_current = currently_executing_command; | |
4436 | run_return_trap (); | |
4437 | currently_executing_command = save_current; | |
4438 | #endif | |
4439 | showing_function_line = 0; | |
4440 | } | |
4441 | ||
4442 | /* Restore BASH_ARGC and BASH_ARGV */ | |
4443 | if (debugging_mode) | |
4444 | pop_args (); | |
4445 | ||
4446 | if (subshell == 0) | |
4447 | run_unwind_frame ("function_calling"); | |
4448 | ||
4449 | #if defined (ARRAY_VARS) | |
4450 | /* These two variables cannot be unset, and cannot be affected by the | |
4451 | function. */ | |
4452 | array_pop ((ARRAY *)bash_source_a); | |
4453 | array_pop ((ARRAY *)bash_lineno_a); | |
4454 | ||
4455 | /* FUNCNAME can be unset, and so can potentially be changed by the | |
4456 | function. */ | |
4457 | GET_ARRAY_FROM_VAR ("FUNCNAME", nfv, funcname_a); | |
4458 | if (nfv == funcname_v) | |
4459 | array_pop (funcname_a); | |
4460 | #endif | |
4461 | ||
4462 | if (variable_context == 0 || this_shell_function == 0) | |
4463 | { | |
4464 | make_funcname_visible (0); | |
4465 | #if defined (PROCESS_SUBSTITUTION) | |
4466 | unlink_fifo_list (); | |
4467 | #endif | |
4468 | } | |
4469 | ||
4470 | return (result); | |
4471 | } | |
4472 | ||
4473 | /* A convenience routine for use by other parts of the shell to execute | |
4474 | a particular shell function. */ | |
4475 | int | |
4476 | execute_shell_function (var, words) | |
4477 | SHELL_VAR *var; | |
4478 | WORD_LIST *words; | |
4479 | { | |
4480 | int ret; | |
4481 | struct fd_bitmap *bitmap; | |
4482 | ||
4483 | bitmap = new_fd_bitmap (FD_BITMAP_DEFAULT_SIZE); | |
4484 | begin_unwind_frame ("execute-shell-function"); | |
4485 | add_unwind_protect (dispose_fd_bitmap, (char *)bitmap); | |
4486 | ||
4487 | ret = execute_function (var, words, 0, bitmap, 0, 0); | |
4488 | ||
4489 | dispose_fd_bitmap (bitmap); | |
4490 | discard_unwind_frame ("execute-shell-function"); | |
4491 | ||
4492 | return ret; | |
4493 | } | |
4494 | ||
4495 | /* Execute a shell builtin or function in a subshell environment. This | |
4496 | routine does not return; it only calls exit(). If BUILTIN is non-null, | |
4497 | it points to a function to call to execute a shell builtin; otherwise | |
4498 | VAR points at the body of a function to execute. WORDS is the arguments | |
4499 | to the command, REDIRECTS specifies redirections to perform before the | |
4500 | command is executed. */ | |
4501 | static void | |
4502 | execute_subshell_builtin_or_function (words, redirects, builtin, var, | |
4503 | pipe_in, pipe_out, async, fds_to_close, | |
4504 | flags) | |
4505 | WORD_LIST *words; | |
4506 | REDIRECT *redirects; | |
4507 | sh_builtin_func_t *builtin; | |
4508 | SHELL_VAR *var; | |
4509 | int pipe_in, pipe_out, async; | |
4510 | struct fd_bitmap *fds_to_close; | |
4511 | int flags; | |
4512 | { | |
4513 | int result, r, funcvalue; | |
4514 | #if defined (JOB_CONTROL) | |
4515 | int jobs_hack; | |
4516 | ||
4517 | jobs_hack = (builtin == jobs_builtin) && | |
4518 | ((subshell_environment & SUBSHELL_ASYNC) == 0 || pipe_out != NO_PIPE); | |
4519 | #endif | |
4520 | ||
4521 | /* A subshell is neither a login shell nor interactive. */ | |
4522 | login_shell = interactive = 0; | |
4523 | ||
4524 | if (async) | |
4525 | subshell_environment |= SUBSHELL_ASYNC; | |
4526 | if (pipe_in != NO_PIPE || pipe_out != NO_PIPE) | |
4527 | subshell_environment |= SUBSHELL_PIPE; | |
4528 | ||
4529 | maybe_make_export_env (); /* XXX - is this needed? */ | |
4530 | ||
4531 | #if defined (JOB_CONTROL) | |
4532 | /* Eradicate all traces of job control after we fork the subshell, so | |
4533 | all jobs begun by this subshell are in the same process group as | |
4534 | the shell itself. */ | |
4535 | ||
4536 | /* Allow the output of `jobs' to be piped. */ | |
4537 | if (jobs_hack) | |
4538 | kill_current_pipeline (); | |
4539 | else | |
4540 | without_job_control (); | |
4541 | ||
4542 | set_sigchld_handler (); | |
4543 | #endif /* JOB_CONTROL */ | |
4544 | ||
4545 | set_sigint_handler (); | |
4546 | ||
4547 | if (fds_to_close) | |
4548 | close_fd_bitmap (fds_to_close); | |
4549 | ||
4550 | do_piping (pipe_in, pipe_out); | |
4551 | ||
4552 | if (do_redirections (redirects, RX_ACTIVE) != 0) | |
4553 | exit (EXECUTION_FAILURE); | |
4554 | ||
4555 | if (builtin) | |
4556 | { | |
4557 | /* Give builtins a place to jump back to on failure, | |
4558 | so we don't go back up to main(). */ | |
4559 | result = setjmp (top_level); | |
4560 | ||
4561 | /* Give the return builtin a place to jump to when executed in a subshell | |
4562 | or pipeline */ | |
4563 | funcvalue = 0; | |
4564 | if (return_catch_flag && builtin == return_builtin) | |
4565 | funcvalue = setjmp (return_catch); | |
4566 | ||
4567 | if (result == EXITPROG) | |
4568 | exit (last_command_exit_value); | |
4569 | else if (result) | |
4570 | exit (EXECUTION_FAILURE); | |
4571 | else if (funcvalue) | |
4572 | exit (return_catch_value); | |
4573 | else | |
4574 | { | |
4575 | r = execute_builtin (builtin, words, flags, 1); | |
4576 | fflush (stdout); | |
4577 | if (r == EX_USAGE) | |
4578 | r = EX_BADUSAGE; | |
4579 | exit (r); | |
4580 | } | |
4581 | } | |
4582 | else | |
4583 | { | |
4584 | r = execute_function (var, words, flags, fds_to_close, async, 1); | |
4585 | fflush (stdout); | |
4586 | exit (r); | |
4587 | } | |
4588 | } | |
4589 | ||
4590 | /* Execute a builtin or function in the current shell context. If BUILTIN | |
4591 | is non-null, it is the builtin command to execute, otherwise VAR points | |
4592 | to the body of a function. WORDS are the command's arguments, REDIRECTS | |
4593 | are the redirections to perform. FDS_TO_CLOSE is the usual bitmap of | |
4594 | file descriptors to close. | |
4595 | ||
4596 | If BUILTIN is exec_builtin, the redirections specified in REDIRECTS are | |
4597 | not undone before this function returns. */ | |
4598 | static int | |
4599 | execute_builtin_or_function (words, builtin, var, redirects, | |
4600 | fds_to_close, flags) | |
4601 | WORD_LIST *words; | |
4602 | sh_builtin_func_t *builtin; | |
4603 | SHELL_VAR *var; | |
4604 | REDIRECT *redirects; | |
4605 | struct fd_bitmap *fds_to_close; | |
4606 | int flags; | |
4607 | { | |
4608 | int result; | |
4609 | REDIRECT *saved_undo_list; | |
4610 | #if defined (PROCESS_SUBSTITUTION) | |
4611 | int ofifo, nfifo, osize; | |
4612 | char *ofifo_list; | |
4613 | #endif | |
4614 | ||
4615 | ||
4616 | #if defined (PROCESS_SUBSTITUTION) | |
4617 | ofifo = num_fifos (); | |
4618 | ofifo_list = copy_fifo_list (&osize); | |
4619 | #endif | |
4620 | ||
4621 | if (do_redirections (redirects, RX_ACTIVE|RX_UNDOABLE) != 0) | |
4622 | { | |
4623 | cleanup_redirects (redirection_undo_list); | |
4624 | redirection_undo_list = (REDIRECT *)NULL; | |
4625 | dispose_exec_redirects (); | |
4626 | #if defined (PROCESS_SUBSTITUTION) | |
4627 | free (ofifo_list); | |
4628 | #endif | |
4629 | return (EX_REDIRFAIL); /* was EXECUTION_FAILURE */ | |
4630 | } | |
4631 | ||
4632 | saved_undo_list = redirection_undo_list; | |
4633 | ||
4634 | /* Calling the "exec" builtin changes redirections forever. */ | |
4635 | if (builtin == exec_builtin) | |
4636 | { | |
4637 | dispose_redirects (saved_undo_list); | |
4638 | saved_undo_list = exec_redirection_undo_list; | |
4639 | exec_redirection_undo_list = (REDIRECT *)NULL; | |
4640 | } | |
4641 | else | |
4642 | dispose_exec_redirects (); | |
4643 | ||
4644 | if (saved_undo_list) | |
4645 | { | |
4646 | begin_unwind_frame ("saved redirects"); | |
4647 | add_unwind_protect (cleanup_redirects, (char *)saved_undo_list); | |
4648 | } | |
4649 | ||
4650 | redirection_undo_list = (REDIRECT *)NULL; | |
4651 | ||
4652 | if (builtin) | |
4653 | result = execute_builtin (builtin, words, flags, 0); | |
4654 | else | |
4655 | result = execute_function (var, words, flags, fds_to_close, 0, 0); | |
4656 | ||
4657 | /* We do this before undoing the effects of any redirections. */ | |
4658 | fflush (stdout); | |
4659 | fpurge (stdout); | |
4660 | if (ferror (stdout)) | |
4661 | clearerr (stdout); | |
4662 | ||
4663 | /* If we are executing the `command' builtin, but this_shell_builtin is | |
4664 | set to `exec_builtin', we know that we have something like | |
4665 | `command exec [redirection]', since otherwise `exec' would have | |
4666 | overwritten the shell and we wouldn't get here. In this case, we | |
4667 | want to behave as if the `command' builtin had not been specified | |
4668 | and preserve the redirections. */ | |
4669 | if (builtin == command_builtin && this_shell_builtin == exec_builtin) | |
4670 | { | |
4671 | int discard; | |
4672 | ||
4673 | discard = 0; | |
4674 | if (saved_undo_list) | |
4675 | { | |
4676 | dispose_redirects (saved_undo_list); | |
4677 | discard = 1; | |
4678 | } | |
4679 | redirection_undo_list = exec_redirection_undo_list; | |
4680 | saved_undo_list = exec_redirection_undo_list = (REDIRECT *)NULL; | |
4681 | if (discard) | |
4682 | discard_unwind_frame ("saved redirects"); | |
4683 | } | |
4684 | ||
4685 | if (saved_undo_list) | |
4686 | { | |
4687 | redirection_undo_list = saved_undo_list; | |
4688 | discard_unwind_frame ("saved redirects"); | |
4689 | } | |
4690 | ||
4691 | if (redirection_undo_list) | |
4692 | { | |
4693 | cleanup_redirects (redirection_undo_list); | |
4694 | redirection_undo_list = (REDIRECT *)NULL; | |
4695 | } | |
4696 | ||
4697 | #if defined (PROCESS_SUBSTITUTION) | |
4698 | /* Close any FIFOs created by this builtin or function. */ | |
4699 | nfifo = num_fifos (); | |
4700 | if (nfifo > ofifo) | |
4701 | close_new_fifos (ofifo_list, osize); | |
4702 | free (ofifo_list); | |
4703 | #endif | |
4704 | ||
4705 | return (result); | |
4706 | } | |
4707 | ||
4708 | void | |
4709 | setup_async_signals () | |
4710 | { | |
4711 | #if defined (__BEOS__) | |
4712 | set_signal_handler (SIGHUP, SIG_IGN); /* they want csh-like behavior */ | |
4713 | #endif | |
4714 | ||
4715 | #if defined (JOB_CONTROL) | |
4716 | if (job_control == 0) | |
4717 | #endif | |
4718 | { | |
4719 | set_signal_handler (SIGINT, SIG_IGN); | |
4720 | set_signal_ignored (SIGINT); | |
4721 | set_signal_handler (SIGQUIT, SIG_IGN); | |
4722 | set_signal_ignored (SIGQUIT); | |
4723 | } | |
4724 | } | |
4725 | ||
4726 | /* Execute a simple command that is hopefully defined in a disk file | |
4727 | somewhere. | |
4728 | ||
4729 | 1) fork () | |
4730 | 2) connect pipes | |
4731 | 3) look up the command | |
4732 | 4) do redirections | |
4733 | 5) execve () | |
4734 | 6) If the execve failed, see if the file has executable mode set. | |
4735 | If so, and it isn't a directory, then execute its contents as | |
4736 | a shell script. | |
4737 | ||
4738 | Note that the filename hashing stuff has to take place up here, | |
4739 | in the parent. This is probably why the Bourne style shells | |
4740 | don't handle it, since that would require them to go through | |
4741 | this gnarly hair, for no good reason. | |
4742 | ||
4743 | NOTE: callers expect this to fork or exit(). */ | |
4744 | ||
4745 | /* Name of a shell function to call when a command name is not found. */ | |
4746 | #ifndef NOTFOUND_HOOK | |
4747 | # define NOTFOUND_HOOK "command_not_found_handle" | |
4748 | #endif | |
4749 | ||
4750 | static int | |
4751 | execute_disk_command (words, redirects, command_line, pipe_in, pipe_out, | |
4752 | async, fds_to_close, cmdflags) | |
4753 | WORD_LIST *words; | |
4754 | REDIRECT *redirects; | |
4755 | char *command_line; | |
4756 | int pipe_in, pipe_out, async; | |
4757 | struct fd_bitmap *fds_to_close; | |
4758 | int cmdflags; | |
4759 | { | |
4760 | char *pathname, *command, **args; | |
4761 | int nofork, result; | |
4762 | pid_t pid; | |
4763 | SHELL_VAR *hookf; | |
4764 | WORD_LIST *wl; | |
4765 | ||
4766 | nofork = (cmdflags & CMD_NO_FORK); /* Don't fork, just exec, if no pipes */ | |
4767 | pathname = words->word->word; | |
4768 | ||
4769 | result = EXECUTION_SUCCESS; | |
4770 | #if defined (RESTRICTED_SHELL) | |
4771 | command = (char *)NULL; | |
4772 | if (restricted && mbschr (pathname, '/')) | |
4773 | { | |
4774 | internal_error (_("%s: restricted: cannot specify `/' in command names"), | |
4775 | pathname); | |
4776 | result = last_command_exit_value = EXECUTION_FAILURE; | |
4777 | ||
4778 | /* If we're not going to fork below, we must already be in a child | |
4779 | process or a context in which it's safe to call exit(2). */ | |
4780 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
4781 | exit (last_command_exit_value); | |
4782 | else | |
4783 | goto parent_return; | |
4784 | } | |
4785 | #endif /* RESTRICTED_SHELL */ | |
4786 | ||
4787 | command = search_for_command (pathname); | |
4788 | ||
4789 | if (command) | |
4790 | { | |
4791 | maybe_make_export_env (); | |
4792 | put_command_name_into_env (command); | |
4793 | } | |
4794 | ||
4795 | /* We have to make the child before we check for the non-existence | |
4796 | of COMMAND, since we want the error messages to be redirected. */ | |
4797 | /* If we can get away without forking and there are no pipes to deal with, | |
4798 | don't bother to fork, just directly exec the command. */ | |
4799 | if (nofork && pipe_in == NO_PIPE && pipe_out == NO_PIPE) | |
4800 | pid = 0; | |
4801 | else | |
4802 | pid = make_child (savestring (command_line), async); | |
4803 | ||
4804 | if (pid == 0) | |
4805 | { | |
4806 | int old_interactive; | |
4807 | ||
4808 | #if 0 | |
4809 | /* This has been disabled for the time being. */ | |
4810 | #if !defined (ARG_MAX) || ARG_MAX >= 10240 | |
4811 | if (posixly_correct == 0) | |
4812 | put_gnu_argv_flags_into_env ((long)getpid (), glob_argv_flags); | |
4813 | #endif | |
4814 | #endif | |
4815 | ||
4816 | reset_terminating_signals (); /* XXX */ | |
4817 | /* Cancel traps, in trap.c. */ | |
4818 | restore_original_signals (); | |
4819 | ||
4820 | /* restore_original_signals may have undone the work done | |
4821 | by make_child to ensure that SIGINT and SIGQUIT are ignored | |
4822 | in asynchronous children. */ | |
4823 | if (async) | |
4824 | { | |
4825 | if ((cmdflags & CMD_STDIN_REDIR) && | |
4826 | pipe_in == NO_PIPE && | |
4827 | (stdin_redirects (redirects) == 0)) | |
4828 | async_redirect_stdin (); | |
4829 | setup_async_signals (); | |
4830 | } | |
4831 | ||
4832 | /* This functionality is now provided by close-on-exec of the | |
4833 | file descriptors manipulated by redirection and piping. | |
4834 | Some file descriptors still need to be closed in all children | |
4835 | because of the way bash does pipes; fds_to_close is a | |
4836 | bitmap of all such file descriptors. */ | |
4837 | if (fds_to_close) | |
4838 | close_fd_bitmap (fds_to_close); | |
4839 | ||
4840 | do_piping (pipe_in, pipe_out); | |
4841 | ||
4842 | old_interactive = interactive; | |
4843 | if (async) | |
4844 | interactive = 0; | |
4845 | ||
4846 | subshell_environment = SUBSHELL_FORK; | |
4847 | ||
4848 | if (redirects && (do_redirections (redirects, RX_ACTIVE) != 0)) | |
4849 | { | |
4850 | #if defined (PROCESS_SUBSTITUTION) | |
4851 | /* Try to remove named pipes that may have been created as the | |
4852 | result of redirections. */ | |
4853 | unlink_fifo_list (); | |
4854 | #endif /* PROCESS_SUBSTITUTION */ | |
4855 | exit (EXECUTION_FAILURE); | |
4856 | } | |
4857 | ||
4858 | if (async) | |
4859 | interactive = old_interactive; | |
4860 | ||
4861 | if (command == 0) | |
4862 | { | |
4863 | hookf = find_function (NOTFOUND_HOOK); | |
4864 | if (hookf == 0) | |
4865 | { | |
4866 | /* Make sure filenames are displayed using printable characters */ | |
4867 | if (ansic_shouldquote (pathname)) | |
4868 | pathname = ansic_quote (pathname, 0, NULL); | |
4869 | internal_error (_("%s: command not found"), pathname); | |
4870 | exit (EX_NOTFOUND); /* Posix.2 says the exit status is 127 */ | |
4871 | } | |
4872 | ||
4873 | wl = make_word_list (make_word (NOTFOUND_HOOK), words); | |
4874 | exit (execute_shell_function (hookf, wl)); | |
4875 | } | |
4876 | ||
4877 | /* Execve expects the command name to be in args[0]. So we | |
4878 | leave it there, in the same format that the user used to | |
4879 | type it in. */ | |
4880 | args = strvec_from_word_list (words, 0, 0, (int *)NULL); | |
4881 | exit (shell_execve (command, args, export_env)); | |
4882 | } | |
4883 | else | |
4884 | { | |
4885 | parent_return: | |
4886 | QUIT; | |
4887 | ||
4888 | /* Make sure that the pipes are closed in the parent. */ | |
4889 | close_pipes (pipe_in, pipe_out); | |
4890 | #if defined (PROCESS_SUBSTITUTION) && defined (HAVE_DEV_FD) | |
4891 | if (variable_context == 0) | |
4892 | unlink_fifo_list (); | |
4893 | #endif | |
4894 | FREE (command); | |
4895 | return (result); | |
4896 | } | |
4897 | } | |
4898 | ||
4899 | /* CPP defines to decide whether a particular index into the #! line | |
4900 | corresponds to a valid interpreter name or argument character, or | |
4901 | whitespace. The MSDOS define is to allow \r to be treated the same | |
4902 | as \n. */ | |
4903 | ||
4904 | #if !defined (MSDOS) | |
4905 | # define STRINGCHAR(ind) \ | |
4906 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n') | |
4907 | # define WHITECHAR(ind) \ | |
4908 | (ind < sample_len && whitespace (sample[ind])) | |
4909 | #else /* MSDOS */ | |
4910 | # define STRINGCHAR(ind) \ | |
4911 | (ind < sample_len && !whitespace (sample[ind]) && sample[ind] != '\n' && sample[ind] != '\r') | |
4912 | # define WHITECHAR(ind) \ | |
4913 | (ind < sample_len && whitespace (sample[ind])) | |
4914 | #endif /* MSDOS */ | |
4915 | ||
4916 | static char * | |
4917 | getinterp (sample, sample_len, endp) | |
4918 | char *sample; | |
4919 | int sample_len, *endp; | |
4920 | { | |
4921 | register int i; | |
4922 | char *execname; | |
4923 | int start; | |
4924 | ||
4925 | /* Find the name of the interpreter to exec. */ | |
4926 | for (i = 2; i < sample_len && whitespace (sample[i]); i++) | |
4927 | ; | |
4928 | ||
4929 | for (start = i; STRINGCHAR(i); i++) | |
4930 | ; | |
4931 | ||
4932 | execname = substring (sample, start, i); | |
4933 | ||
4934 | if (endp) | |
4935 | *endp = i; | |
4936 | return execname; | |
4937 | } | |
4938 | ||
4939 | #if !defined (HAVE_HASH_BANG_EXEC) | |
4940 | /* If the operating system on which we're running does not handle | |
4941 | the #! executable format, then help out. SAMPLE is the text read | |
4942 | from the file, SAMPLE_LEN characters. COMMAND is the name of | |
4943 | the script; it and ARGS, the arguments given by the user, will | |
4944 | become arguments to the specified interpreter. ENV is the environment | |
4945 | to pass to the interpreter. | |
4946 | ||
4947 | The word immediately following the #! is the interpreter to execute. | |
4948 | A single argument to the interpreter is allowed. */ | |
4949 | ||
4950 | static int | |
4951 | execute_shell_script (sample, sample_len, command, args, env) | |
4952 | char *sample; | |
4953 | int sample_len; | |
4954 | char *command; | |
4955 | char **args, **env; | |
4956 | { | |
4957 | char *execname, *firstarg; | |
4958 | int i, start, size_increment, larry; | |
4959 | ||
4960 | /* Find the name of the interpreter to exec. */ | |
4961 | execname = getinterp (sample, sample_len, &i); | |
4962 | size_increment = 1; | |
4963 | ||
4964 | /* Now the argument, if any. */ | |
4965 | for (firstarg = (char *)NULL, start = i; WHITECHAR(i); i++) | |
4966 | ; | |
4967 | ||
4968 | /* If there is more text on the line, then it is an argument for the | |
4969 | interpreter. */ | |
4970 | ||
4971 | if (STRINGCHAR(i)) | |
4972 | { | |
4973 | for (start = i; STRINGCHAR(i); i++) | |
4974 | ; | |
4975 | firstarg = substring ((char *)sample, start, i); | |
4976 | size_increment = 2; | |
4977 | } | |
4978 | ||
4979 | larry = strvec_len (args) + size_increment; | |
4980 | args = strvec_resize (args, larry + 1); | |
4981 | ||
4982 | for (i = larry - 1; i; i--) | |
4983 | args[i] = args[i - size_increment]; | |
4984 | ||
4985 | args[0] = execname; | |
4986 | if (firstarg) | |
4987 | { | |
4988 | args[1] = firstarg; | |
4989 | args[2] = command; | |
4990 | } | |
4991 | else | |
4992 | args[1] = command; | |
4993 | ||
4994 | args[larry] = (char *)NULL; | |
4995 | ||
4996 | return (shell_execve (execname, args, env)); | |
4997 | } | |
4998 | #undef STRINGCHAR | |
4999 | #undef WHITECHAR | |
5000 | ||
5001 | #endif /* !HAVE_HASH_BANG_EXEC */ | |
5002 | ||
5003 | static void | |
5004 | initialize_subshell () | |
5005 | { | |
5006 | #if defined (ALIAS) | |
5007 | /* Forget about any aliases that we knew of. We are in a subshell. */ | |
5008 | delete_all_aliases (); | |
5009 | #endif /* ALIAS */ | |
5010 | ||
5011 | #if defined (HISTORY) | |
5012 | /* Forget about the history lines we have read. This is a non-interactive | |
5013 | subshell. */ | |
5014 | history_lines_this_session = 0; | |
5015 | #endif | |
5016 | ||
5017 | #if defined (JOB_CONTROL) | |
5018 | /* Forget about the way job control was working. We are in a subshell. */ | |
5019 | without_job_control (); | |
5020 | set_sigchld_handler (); | |
5021 | init_job_stats (); | |
5022 | #endif /* JOB_CONTROL */ | |
5023 | ||
5024 | /* Reset the values of the shell flags and options. */ | |
5025 | reset_shell_flags (); | |
5026 | reset_shell_options (); | |
5027 | reset_shopt_options (); | |
5028 | ||
5029 | /* Zero out builtin_env, since this could be a shell script run from a | |
5030 | sourced file with a temporary environment supplied to the `source/.' | |
5031 | builtin. Such variables are not supposed to be exported (empirical | |
5032 | testing with sh and ksh). Just throw it away; don't worry about a | |
5033 | memory leak. */ | |
5034 | if (vc_isbltnenv (shell_variables)) | |
5035 | shell_variables = shell_variables->down; | |
5036 | ||
5037 | clear_unwind_protect_list (0); | |
5038 | /* XXX -- are there other things we should be resetting here? */ | |
5039 | parse_and_execute_level = 0; /* nothing left to restore it */ | |
5040 | ||
5041 | /* We're no longer inside a shell function. */ | |
5042 | variable_context = return_catch_flag = funcnest = 0; | |
5043 | ||
5044 | executing_list = 0; /* XXX */ | |
5045 | ||
5046 | /* If we're not interactive, close the file descriptor from which we're | |
5047 | reading the current shell script. */ | |
5048 | if (interactive_shell == 0) | |
5049 | unset_bash_input (0); | |
5050 | } | |
5051 | ||
5052 | #if defined (HAVE_SETOSTYPE) && defined (_POSIX_SOURCE) | |
5053 | # define SETOSTYPE(x) __setostype(x) | |
5054 | #else | |
5055 | # define SETOSTYPE(x) | |
5056 | #endif | |
5057 | ||
5058 | #define READ_SAMPLE_BUF(file, buf, len) \ | |
5059 | do \ | |
5060 | { \ | |
5061 | fd = open(file, O_RDONLY); \ | |
5062 | if (fd >= 0) \ | |
5063 | { \ | |
5064 | len = read (fd, buf, 80); \ | |
5065 | close (fd); \ | |
5066 | } \ | |
5067 | else \ | |
5068 | len = -1; \ | |
5069 | } \ | |
5070 | while (0) | |
5071 | ||
5072 | /* Call execve (), handling interpreting shell scripts, and handling | |
5073 | exec failures. */ | |
5074 | int | |
5075 | shell_execve (command, args, env) | |
5076 | char *command; | |
5077 | char **args, **env; | |
5078 | { | |
5079 | int larray, i, fd; | |
5080 | char sample[80]; | |
5081 | int sample_len; | |
5082 | ||
5083 | SETOSTYPE (0); /* Some systems use for USG/POSIX semantics */ | |
5084 | execve (command, args, env); | |
5085 | i = errno; /* error from execve() */ | |
5086 | CHECK_TERMSIG; | |
5087 | SETOSTYPE (1); | |
5088 | ||
5089 | /* If we get to this point, then start checking out the file. | |
5090 | Maybe it is something we can hack ourselves. */ | |
5091 | if (i != ENOEXEC) | |
5092 | { | |
5093 | if (file_isdir (command)) | |
5094 | #if defined (EISDIR) | |
5095 | internal_error (_("%s: %s"), command, strerror (EISDIR)); | |
5096 | #else | |
5097 | internal_error (_("%s: is a directory"), command); | |
5098 | #endif | |
5099 | else if (executable_file (command) == 0) | |
5100 | { | |
5101 | errno = i; | |
5102 | file_error (command); | |
5103 | } | |
5104 | /* errors not involving the path argument to execve. */ | |
5105 | else if (i == E2BIG || i == ENOMEM) | |
5106 | { | |
5107 | errno = i; | |
5108 | file_error (command); | |
5109 | } | |
5110 | else | |
5111 | { | |
5112 | /* The file has the execute bits set, but the kernel refuses to | |
5113 | run it for some reason. See why. */ | |
5114 | #if defined (HAVE_HASH_BANG_EXEC) | |
5115 | READ_SAMPLE_BUF (command, sample, sample_len); | |
631b20c6 | 5116 | sample[sample_len - 1] = '\0'; |
19baff85 CR |
5117 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') |
5118 | { | |
5119 | char *interp; | |
5120 | int ilen; | |
5121 | ||
5122 | interp = getinterp (sample, sample_len, (int *)NULL); | |
5123 | ilen = strlen (interp); | |
5124 | errno = i; | |
5125 | if (interp[ilen - 1] == '\r') | |
5126 | { | |
5127 | interp = xrealloc (interp, ilen + 2); | |
5128 | interp[ilen - 1] = '^'; | |
5129 | interp[ilen] = 'M'; | |
5130 | interp[ilen + 1] = '\0'; | |
5131 | } | |
5132 | sys_error (_("%s: %s: bad interpreter"), command, interp ? interp : ""); | |
5133 | FREE (interp); | |
5134 | return (EX_NOEXEC); | |
5135 | } | |
5136 | #endif | |
5137 | errno = i; | |
5138 | file_error (command); | |
5139 | } | |
5140 | return ((i == ENOENT) ? EX_NOTFOUND : EX_NOEXEC); /* XXX Posix.2 says that exit status is 126 */ | |
5141 | } | |
5142 | ||
5143 | /* This file is executable. | |
5144 | If it begins with #!, then help out people with losing operating | |
5145 | systems. Otherwise, check to see if it is a binary file by seeing | |
5146 | if the contents of the first line (or up to 80 characters) are in the | |
5147 | ASCII set. If it's a text file, execute the contents as shell commands, | |
5148 | otherwise return 126 (EX_BINARY_FILE). */ | |
5149 | READ_SAMPLE_BUF (command, sample, sample_len); | |
5150 | ||
5151 | if (sample_len == 0) | |
5152 | return (EXECUTION_SUCCESS); | |
5153 | ||
5154 | /* Is this supposed to be an executable script? | |
5155 | If so, the format of the line is "#! interpreter [argument]". | |
5156 | A single argument is allowed. The BSD kernel restricts | |
5157 | the length of the entire line to 32 characters (32 bytes | |
5158 | being the size of the BSD exec header), but we allow 80 | |
5159 | characters. */ | |
5160 | if (sample_len > 0) | |
5161 | { | |
5162 | #if !defined (HAVE_HASH_BANG_EXEC) | |
5163 | if (sample_len > 2 && sample[0] == '#' && sample[1] == '!') | |
5164 | return (execute_shell_script (sample, sample_len, command, args, env)); | |
5165 | else | |
5166 | #endif | |
5167 | if (check_binary_file (sample, sample_len)) | |
5168 | { | |
122f603c | 5169 | internal_error (_("%s: cannot execute binary file: %s"), command, strerror (i)); |
19baff85 CR |
5170 | return (EX_BINARY_FILE); |
5171 | } | |
5172 | } | |
5173 | ||
5174 | /* We have committed to attempting to execute the contents of this file | |
5175 | as shell commands. */ | |
5176 | ||
5177 | initialize_subshell (); | |
5178 | ||
5179 | set_sigint_handler (); | |
5180 | ||
5181 | /* Insert the name of this shell into the argument list. */ | |
5182 | larray = strvec_len (args) + 1; | |
5183 | args = strvec_resize (args, larray + 1); | |
5184 | ||
5185 | for (i = larray - 1; i; i--) | |
5186 | args[i] = args[i - 1]; | |
5187 | ||
5188 | args[0] = shell_name; | |
5189 | args[1] = command; | |
5190 | args[larray] = (char *)NULL; | |
5191 | ||
5192 | if (args[0][0] == '-') | |
5193 | args[0]++; | |
5194 | ||
5195 | #if defined (RESTRICTED_SHELL) | |
5196 | if (restricted) | |
5197 | change_flag ('r', FLAG_OFF); | |
5198 | #endif | |
5199 | ||
5200 | if (subshell_argv) | |
5201 | { | |
5202 | /* Can't free subshell_argv[0]; that is shell_name. */ | |
5203 | for (i = 1; i < subshell_argc; i++) | |
5204 | free (subshell_argv[i]); | |
5205 | free (subshell_argv); | |
5206 | } | |
5207 | ||
5208 | dispose_command (currently_executing_command); /* XXX */ | |
5209 | currently_executing_command = (COMMAND *)NULL; | |
5210 | ||
5211 | subshell_argc = larray; | |
5212 | subshell_argv = args; | |
5213 | subshell_envp = env; | |
5214 | ||
5215 | unbind_args (); /* remove the positional parameters */ | |
5216 | ||
5217 | longjmp (subshell_top_level, 1); | |
5218 | /*NOTREACHED*/ | |
5219 | } | |
5220 | ||
5221 | static int | |
5222 | execute_intern_function (name, function) | |
5223 | WORD_DESC *name; | |
5224 | COMMAND *function; | |
5225 | { | |
5226 | SHELL_VAR *var; | |
5227 | ||
5228 | if (check_identifier (name, posixly_correct) == 0) | |
5229 | { | |
5230 | if (posixly_correct && interactive_shell == 0) | |
5231 | { | |
5232 | last_command_exit_value = EX_BADUSAGE; | |
5233 | jump_to_top_level (ERREXIT); | |
5234 | } | |
5235 | return (EXECUTION_FAILURE); | |
5236 | } | |
5237 | ||
122f603c CR |
5238 | /* Posix interpretation 383 */ |
5239 | if (posixly_correct && find_special_builtin (name->word)) | |
5240 | { | |
5241 | internal_error (_("`%s': is a special builtin"), name->word); | |
5242 | last_command_exit_value = EX_BADUSAGE; | |
5243 | jump_to_top_level (ERREXIT); | |
5244 | } | |
5245 | ||
19baff85 CR |
5246 | var = find_function (name->word); |
5247 | if (var && (readonly_p (var) || noassign_p (var))) | |
5248 | { | |
5249 | if (readonly_p (var)) | |
5250 | internal_error (_("%s: readonly function"), var->name); | |
5251 | return (EXECUTION_FAILURE); | |
5252 | } | |
5253 | ||
5254 | bind_function (name->word, function); | |
5255 | return (EXECUTION_SUCCESS); | |
5256 | } | |
5257 | ||
5258 | #if defined (INCLUDE_UNUSED) | |
5259 | #if defined (PROCESS_SUBSTITUTION) | |
5260 | void | |
5261 | close_all_files () | |
5262 | { | |
5263 | register int i, fd_table_size; | |
5264 | ||
5265 | fd_table_size = getdtablesize (); | |
5266 | if (fd_table_size > 256) /* clamp to a reasonable value */ | |
5267 | fd_table_size = 256; | |
5268 | ||
5269 | for (i = 3; i < fd_table_size; i++) | |
5270 | close (i); | |
5271 | } | |
5272 | #endif /* PROCESS_SUBSTITUTION */ | |
5273 | #endif | |
5274 | ||
5275 | static void | |
5276 | close_pipes (in, out) | |
5277 | int in, out; | |
5278 | { | |
5279 | if (in >= 0) | |
5280 | close (in); | |
5281 | if (out >= 0) | |
5282 | close (out); | |
5283 | } | |
5284 | ||
5285 | static void | |
5286 | dup_error (oldd, newd) | |
5287 | int oldd, newd; | |
5288 | { | |
5289 | sys_error (_("cannot duplicate fd %d to fd %d"), oldd, newd); | |
5290 | } | |
5291 | ||
5292 | /* Redirect input and output to be from and to the specified pipes. | |
5293 | NO_PIPE and REDIRECT_BOTH are handled correctly. */ | |
5294 | static void | |
5295 | do_piping (pipe_in, pipe_out) | |
5296 | int pipe_in, pipe_out; | |
5297 | { | |
5298 | if (pipe_in != NO_PIPE) | |
5299 | { | |
5300 | if (dup2 (pipe_in, 0) < 0) | |
5301 | dup_error (pipe_in, 0); | |
5302 | if (pipe_in > 0) | |
5303 | close (pipe_in); | |
5304 | #ifdef __CYGWIN__ | |
5305 | /* Let stdio know the fd may have changed from text to binary mode. */ | |
5306 | freopen (NULL, "r", stdin); | |
5307 | #endif /* __CYGWIN__ */ | |
5308 | } | |
5309 | if (pipe_out != NO_PIPE) | |
5310 | { | |
5311 | if (pipe_out != REDIRECT_BOTH) | |
5312 | { | |
5313 | if (dup2 (pipe_out, 1) < 0) | |
5314 | dup_error (pipe_out, 1); | |
5315 | if (pipe_out == 0 || pipe_out > 1) | |
5316 | close (pipe_out); | |
5317 | } | |
5318 | else | |
5319 | { | |
5320 | if (dup2 (1, 2) < 0) | |
5321 | dup_error (1, 2); | |
5322 | } | |
5323 | #ifdef __CYGWIN__ | |
5324 | /* Let stdio know the fd may have changed from text to binary mode, and | |
5325 | make sure to preserve stdout line buffering. */ | |
5326 | freopen (NULL, "w", stdout); | |
5327 | sh_setlinebuf (stdout); | |
5328 | #endif /* __CYGWIN__ */ | |
5329 | } | |
5330 | } |