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Commit | Line | Data |
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3185942a | 1 | /* jobs.c - functions that make children, remember them, and handle their termination. */ |
726f6388 | 2 | |
ccc6cda3 JA |
3 | /* This file works with both POSIX and BSD systems. It implements job |
4 | control. */ | |
726f6388 | 5 | |
a0c0a00f | 6 | /* Copyright (C) 1989-2015 Free Software Foundation, Inc. |
726f6388 JA |
7 | |
8 | This file is part of GNU Bash, the Bourne Again SHell. | |
9 | ||
3185942a JA |
10 | Bash is free software: you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation, either version 3 of the License, or | |
13 | (at your option) any later version. | |
726f6388 | 14 | |
3185942a JA |
15 | Bash is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
726f6388 | 19 | |
3185942a JA |
20 | You should have received a copy of the GNU General Public License |
21 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
22 | */ | |
726f6388 | 23 | |
726f6388 JA |
24 | #include "config.h" |
25 | ||
726f6388 JA |
26 | #include "bashtypes.h" |
27 | #include "trap.h" | |
28 | #include <stdio.h> | |
29 | #include <signal.h> | |
30 | #include <errno.h> | |
31 | ||
ccc6cda3 JA |
32 | #if defined (HAVE_UNISTD_H) |
33 | # include <unistd.h> | |
34 | #endif | |
726f6388 | 35 | |
f73dda09 | 36 | #include "posixtime.h" |
ccc6cda3 | 37 | |
cce855bc | 38 | #if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_WAIT3) && !defined (_POSIX_VERSION) && !defined (RLIMTYPE) |
ccc6cda3 | 39 | # include <sys/resource.h> |
cce855bc | 40 | #endif /* !_POSIX_VERSION && HAVE_SYS_RESOURCE_H && HAVE_WAIT3 && !RLIMTYPE */ |
726f6388 | 41 | |
b80f6443 JA |
42 | #if defined (HAVE_SYS_FILE_H) |
43 | # include <sys/file.h> | |
44 | #endif | |
45 | ||
726f6388 JA |
46 | #include "filecntl.h" |
47 | #include <sys/ioctl.h> | |
ac50fbac | 48 | #if defined (HAVE_SYS_PARAM_H) |
726f6388 | 49 | #include <sys/param.h> |
ac50fbac | 50 | #endif |
726f6388 JA |
51 | |
52 | #if defined (BUFFERED_INPUT) | |
53 | # include "input.h" | |
54 | #endif | |
55 | ||
ccc6cda3 | 56 | /* Need to include this up here for *_TTY_DRIVER definitions. */ |
bb70624e | 57 | #include "shtty.h" |
726f6388 JA |
58 | |
59 | /* Define this if your output is getting swallowed. It's a no-op on | |
60 | machines with the termio or termios tty drivers. */ | |
61 | /* #define DRAIN_OUTPUT */ | |
62 | ||
726f6388 | 63 | /* For the TIOCGPGRP and TIOCSPGRP ioctl parameters on HP-UX */ |
726f6388 JA |
64 | #if defined (hpux) && !defined (TERMIOS_TTY_DRIVER) |
65 | # include <bsdtty.h> | |
66 | #endif /* hpux && !TERMIOS_TTY_DRIVER */ | |
67 | ||
68 | #include "bashansi.h" | |
b80f6443 | 69 | #include "bashintl.h" |
726f6388 JA |
70 | #include "shell.h" |
71 | #include "jobs.h" | |
3185942a | 72 | #include "execute_cmd.h" |
ccc6cda3 | 73 | #include "flags.h" |
726f6388 JA |
74 | |
75 | #include "builtins/builtext.h" | |
76 | #include "builtins/common.h" | |
77 | ||
a0c0a00f CR |
78 | #if defined (READLINE) |
79 | # include <readline/readline.h> | |
80 | #endif | |
81 | ||
726f6388 JA |
82 | #if !defined (errno) |
83 | extern int errno; | |
84 | #endif /* !errno */ | |
85 | ||
495aee44 CR |
86 | #if !defined (HAVE_KILLPG) |
87 | extern int killpg __P((pid_t, int)); | |
88 | #endif | |
89 | ||
ac50fbac CR |
90 | #if !DEFAULT_CHILD_MAX |
91 | # define DEFAULT_CHILD_MAX 32 | |
92 | #endif | |
93 | ||
94 | #if !MAX_CHILD_MAX | |
95 | # define MAX_CHILD_MAX 8192 | |
96 | #endif | |
97 | ||
0628567a JA |
98 | #if !defined (DEBUG) |
99 | #define MAX_JOBS_IN_ARRAY 4096 /* production */ | |
100 | #else | |
101 | #define MAX_JOBS_IN_ARRAY 128 /* testing */ | |
102 | #endif | |
103 | ||
a0c0a00f CR |
104 | /* XXX for now */ |
105 | #define PIDSTAT_TABLE_SZ 4096 | |
106 | #define BGPIDS_TABLE_SZ 512 | |
107 | ||
0628567a JA |
108 | /* Flag values for second argument to delete_job */ |
109 | #define DEL_WARNSTOPPED 1 /* warn about deleting stopped jobs */ | |
110 | #define DEL_NOBGPID 2 /* don't add pgrp leader to bgpids */ | |
b72432fd | 111 | |
ccc6cda3 JA |
112 | /* Take care of system dependencies that must be handled when waiting for |
113 | children. The arguments to the WAITPID macro match those to the Posix.1 | |
114 | waitpid() function. */ | |
115 | ||
116 | #if defined (ultrix) && defined (mips) && defined (_POSIX_VERSION) | |
117 | # define WAITPID(pid, statusp, options) \ | |
118 | wait3 ((union wait *)statusp, options, (struct rusage *)0) | |
119 | #else | |
120 | # if defined (_POSIX_VERSION) || defined (HAVE_WAITPID) | |
121 | # define WAITPID(pid, statusp, options) \ | |
122 | waitpid ((pid_t)pid, statusp, options) | |
123 | # else | |
124 | # if defined (HAVE_WAIT3) | |
125 | # define WAITPID(pid, statusp, options) \ | |
126 | wait3 (statusp, options, (struct rusage *)0) | |
127 | # else | |
128 | # define WAITPID(pid, statusp, options) \ | |
129 | wait3 (statusp, options, (int *)0) | |
130 | # endif /* HAVE_WAIT3 */ | |
131 | # endif /* !_POSIX_VERSION && !HAVE_WAITPID*/ | |
132 | #endif /* !(Ultrix && mips && _POSIX_VERSION) */ | |
133 | ||
134 | /* getpgrp () varies between systems. Even systems that claim to be | |
135 | Posix.1 compatible lie sometimes (Ultrix, SunOS4, apollo). */ | |
136 | #if defined (GETPGRP_VOID) | |
137 | # define getpgid(p) getpgrp () | |
138 | #else | |
139 | # define getpgid(p) getpgrp (p) | |
140 | #endif /* !GETPGRP_VOID */ | |
141 | ||
142 | /* If the system needs it, REINSTALL_SIGCHLD_HANDLER will reinstall the | |
143 | handler for SIGCHLD. */ | |
144 | #if defined (MUST_REINSTALL_SIGHANDLERS) | |
145 | # define REINSTALL_SIGCHLD_HANDLER signal (SIGCHLD, sigchld_handler) | |
146 | #else | |
147 | # define REINSTALL_SIGCHLD_HANDLER | |
148 | #endif /* !MUST_REINSTALL_SIGHANDLERS */ | |
149 | ||
f73dda09 | 150 | /* Some systems let waitpid(2) tell callers about stopped children. */ |
95732b49 JA |
151 | #if !defined (WCONTINUED) || defined (WCONTINUED_BROKEN) |
152 | # undef WCONTINUED | |
f73dda09 | 153 | # define WCONTINUED 0 |
b80f6443 JA |
154 | #endif |
155 | #if !defined (WIFCONTINUED) | |
f73dda09 JA |
156 | # define WIFCONTINUED(s) (0) |
157 | #endif | |
158 | ||
ccc6cda3 JA |
159 | /* The number of additional slots to allocate when we run out. */ |
160 | #define JOB_SLOTS 8 | |
161 | ||
f73dda09 JA |
162 | typedef int sh_job_map_func_t __P((JOB *, int, int, int)); |
163 | ||
726f6388 | 164 | /* Variables used here but defined in other files. */ |
7117c2d2 | 165 | extern int subshell_environment, line_number; |
f73dda09 | 166 | extern int posixly_correct, shell_level; |
b80f6443 | 167 | extern int last_command_exit_value, last_command_exit_signal; |
726f6388 | 168 | extern int loop_level, breaking; |
3185942a | 169 | extern int executing_list; |
28ef6c31 | 170 | extern int sourcelevel; |
0628567a | 171 | extern int running_trap; |
f73dda09 | 172 | extern sh_builtin_func_t *this_shell_builtin; |
726f6388 JA |
173 | extern char *shell_name, *this_command_name; |
174 | extern sigset_t top_level_mask; | |
bb70624e | 175 | extern procenv_t wait_intr_buf; |
a0c0a00f | 176 | extern int wait_intr_flag; |
7117c2d2 | 177 | extern int wait_signal_received; |
bb70624e | 178 | extern WORD_LIST *subst_assign_varlist; |
726f6388 | 179 | |
a0c0a00f CR |
180 | extern SigHandler **original_signals; |
181 | ||
182 | extern void set_original_signal __P((int, SigHandler *)); | |
183 | ||
95732b49 JA |
184 | static struct jobstats zerojs = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 }; |
185 | struct jobstats js = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 }; | |
186 | ||
a0c0a00f | 187 | ps_index_t pidstat_table[PIDSTAT_TABLE_SZ]; |
95732b49 JA |
188 | struct bgpids bgpids = { 0, 0, 0 }; |
189 | ||
726f6388 JA |
190 | /* The array of known jobs. */ |
191 | JOB **jobs = (JOB **)NULL; | |
192 | ||
95732b49 | 193 | #if 0 |
726f6388 JA |
194 | /* The number of slots currently allocated to JOBS. */ |
195 | int job_slots = 0; | |
95732b49 | 196 | #endif |
726f6388 | 197 | |
726f6388 JA |
198 | /* The controlling tty for this shell. */ |
199 | int shell_tty = -1; | |
200 | ||
201 | /* The shell's process group. */ | |
202 | pid_t shell_pgrp = NO_PID; | |
203 | ||
204 | /* The terminal's process group. */ | |
205 | pid_t terminal_pgrp = NO_PID; | |
206 | ||
207 | /* The process group of the shell's parent. */ | |
208 | pid_t original_pgrp = NO_PID; | |
209 | ||
210 | /* The process group of the pipeline currently being made. */ | |
211 | pid_t pipeline_pgrp = (pid_t)0; | |
212 | ||
213 | #if defined (PGRP_PIPE) | |
214 | /* Pipes which each shell uses to communicate with the process group leader | |
215 | until all of the processes in a pipeline have been started. Then the | |
216 | process leader is allowed to continue. */ | |
217 | int pgrp_pipe[2] = { -1, -1 }; | |
218 | #endif | |
ccc6cda3 | 219 | |
95732b49 | 220 | #if 0 |
726f6388 JA |
221 | /* The job which is current; i.e. the one that `%+' stands for. */ |
222 | int current_job = NO_JOB; | |
223 | ||
224 | /* The previous job; i.e. the one that `%-' stands for. */ | |
225 | int previous_job = NO_JOB; | |
95732b49 | 226 | #endif |
726f6388 JA |
227 | |
228 | /* Last child made by the shell. */ | |
ac50fbac | 229 | volatile pid_t last_made_pid = NO_PID; |
726f6388 JA |
230 | |
231 | /* Pid of the last asynchronous child. */ | |
ac50fbac | 232 | volatile pid_t last_asynchronous_pid = NO_PID; |
726f6388 JA |
233 | |
234 | /* The pipeline currently being built. */ | |
235 | PROCESS *the_pipeline = (PROCESS *)NULL; | |
236 | ||
237 | /* If this is non-zero, do job control. */ | |
238 | int job_control = 1; | |
239 | ||
a0c0a00f CR |
240 | /* Are we running in background? (terminal_pgrp != shell_pgrp) */ |
241 | int running_in_background = 0; | |
242 | ||
726f6388 JA |
243 | /* Call this when you start making children. */ |
244 | int already_making_children = 0; | |
245 | ||
ccc6cda3 JA |
246 | /* If this is non-zero, $LINES and $COLUMNS are reset after every process |
247 | exits from get_tty_state(). */ | |
ac50fbac | 248 | int check_window_size = CHECKWINSIZE_DEFAULT; |
ccc6cda3 | 249 | |
a0c0a00f CR |
250 | PROCESS *last_procsub_child = (PROCESS *)NULL; |
251 | ||
726f6388 | 252 | /* Functions local to this file. */ |
f73dda09 | 253 | |
f73dda09 JA |
254 | static sighandler wait_sigint_handler __P((int)); |
255 | static sighandler sigchld_handler __P((int)); | |
f73dda09 JA |
256 | static sighandler sigcont_sighandler __P((int)); |
257 | static sighandler sigstop_sighandler __P((int)); | |
258 | ||
259 | static int waitchld __P((pid_t, int)); | |
260 | ||
7117c2d2 | 261 | static PROCESS *find_pipeline __P((pid_t, int, int *)); |
95732b49 | 262 | static PROCESS *find_process __P((pid_t, int, int *)); |
f73dda09 JA |
263 | |
264 | static char *current_working_directory __P((void)); | |
265 | static char *job_working_directory __P((void)); | |
b80f6443 | 266 | static char *j_strsignal __P((int)); |
f73dda09 JA |
267 | static char *printable_job_status __P((int, PROCESS *, int)); |
268 | ||
95732b49 | 269 | static PROCESS *find_last_proc __P((int, int)); |
7117c2d2 | 270 | static pid_t find_last_pid __P((int, int)); |
f73dda09 JA |
271 | |
272 | static int set_new_line_discipline __P((int)); | |
273 | static int map_over_jobs __P((sh_job_map_func_t *, int, int)); | |
274 | static int job_last_stopped __P((int)); | |
275 | static int job_last_running __P((int)); | |
276 | static int most_recent_job_in_state __P((int, JOB_STATE)); | |
95732b49 | 277 | static int find_job __P((pid_t, int, PROCESS **)); |
f73dda09 JA |
278 | static int print_job __P((JOB *, int, int, int)); |
279 | static int process_exit_status __P((WAIT)); | |
b80f6443 | 280 | static int process_exit_signal __P((WAIT)); |
f73dda09 JA |
281 | static int set_job_status_and_cleanup __P((int)); |
282 | ||
f1be666c | 283 | static WAIT job_signal_status __P((int)); |
f73dda09 JA |
284 | static WAIT raw_job_exit_status __P((int)); |
285 | ||
286 | static void notify_of_job_status __P((void)); | |
95732b49 | 287 | static void reset_job_indices __P((void)); |
f73dda09 | 288 | static void cleanup_dead_jobs __P((void)); |
95732b49 JA |
289 | static int processes_in_job __P((int)); |
290 | static void realloc_jobs_list __P((void)); | |
7117c2d2 | 291 | static int compact_jobs_list __P((int)); |
f73dda09 JA |
292 | static void add_process __P((char *, pid_t)); |
293 | static void print_pipeline __P((PROCESS *, int, int, FILE *)); | |
294 | static void pretty_print_job __P((int, int, FILE *)); | |
295 | static void set_current_job __P((int)); | |
296 | static void reset_current __P((void)); | |
297 | static void set_job_running __P((int)); | |
298 | static void setjstatus __P((int)); | |
3185942a | 299 | static int maybe_give_terminal_to __P((pid_t, pid_t, int)); |
f73dda09 JA |
300 | static void mark_all_jobs_as_dead __P((void)); |
301 | static void mark_dead_jobs_as_notified __P((int)); | |
302 | static void restore_sigint_handler __P((void)); | |
726f6388 | 303 | #if defined (PGRP_PIPE) |
f73dda09 | 304 | static void pipe_read __P((int *)); |
726f6388 JA |
305 | #endif |
306 | ||
a0c0a00f CR |
307 | /* Hash table manipulation */ |
308 | ||
309 | static ps_index_t *pshash_getbucket __P((pid_t)); | |
310 | static void pshash_delindex __P((ps_index_t)); | |
311 | ||
312 | /* Saved background process status management */ | |
95732b49 JA |
313 | static struct pidstat *bgp_add __P((pid_t, int)); |
314 | static int bgp_delete __P((pid_t)); | |
315 | static void bgp_clear __P((void)); | |
316 | static int bgp_search __P((pid_t)); | |
a0c0a00f CR |
317 | |
318 | static ps_index_t bgp_getindex __P((void)); | |
319 | static void bgp_resize __P((void)); /* XXX */ | |
95732b49 | 320 | |
7117c2d2 JA |
321 | #if defined (ARRAY_VARS) |
322 | static int *pstatuses; /* list of pipeline statuses */ | |
323 | static int statsize; | |
324 | #endif | |
325 | ||
326 | /* Used to synchronize between wait_for and other functions and the SIGCHLD | |
327 | signal handler. */ | |
ccc6cda3 | 328 | static int sigchld; |
7117c2d2 JA |
329 | static int queue_sigchld; |
330 | ||
331 | #define QUEUE_SIGCHLD(os) (os) = sigchld, queue_sigchld++ | |
332 | ||
333 | #define UNQUEUE_SIGCHLD(os) \ | |
334 | do { \ | |
335 | queue_sigchld--; \ | |
336 | if (queue_sigchld == 0 && os != sigchld) \ | |
337 | waitchld (-1, 0); \ | |
338 | } while (0) | |
339 | ||
340 | static SigHandler *old_tstp, *old_ttou, *old_ttin; | |
341 | static SigHandler *old_cont = (SigHandler *)SIG_DFL; | |
342 | ||
ccc6cda3 | 343 | /* A place to temporarily save the current pipeline. */ |
a0c0a00f | 344 | static struct pipeline_saver *saved_pipeline; |
ccc6cda3 | 345 | static int saved_already_making_children; |
726f6388 JA |
346 | |
347 | /* Set this to non-zero whenever you don't want the jobs list to change at | |
348 | all: no jobs deleted and no status change notifications. This is used, | |
349 | for example, when executing SIGCHLD traps, which may run arbitrary | |
350 | commands. */ | |
ccc6cda3 | 351 | static int jobs_list_frozen; |
726f6388 | 352 | |
28ef6c31 JA |
353 | static char retcode_name_buffer[64]; |
354 | ||
726f6388 JA |
355 | #if !defined (_POSIX_VERSION) |
356 | ||
357 | /* These are definitions to map POSIX 1003.1 functions onto existing BSD | |
358 | library functions and system calls. */ | |
359 | #define setpgid(pid, pgrp) setpgrp (pid, pgrp) | |
360 | #define tcsetpgrp(fd, pgrp) ioctl ((fd), TIOCSPGRP, &(pgrp)) | |
361 | ||
362 | pid_t | |
363 | tcgetpgrp (fd) | |
364 | int fd; | |
365 | { | |
366 | pid_t pgrp; | |
367 | ||
368 | /* ioctl will handle setting errno correctly. */ | |
369 | if (ioctl (fd, TIOCGPGRP, &pgrp) < 0) | |
370 | return (-1); | |
371 | return (pgrp); | |
372 | } | |
373 | ||
726f6388 JA |
374 | #endif /* !_POSIX_VERSION */ |
375 | ||
0628567a | 376 | /* Initialize the global job stats structure and other bookkeeping variables */ |
95732b49 JA |
377 | void |
378 | init_job_stats () | |
379 | { | |
380 | js = zerojs; | |
381 | } | |
382 | ||
726f6388 JA |
383 | /* Return the working directory for the current process. Unlike |
384 | job_working_directory, this does not call malloc (), nor do any | |
385 | of the functions it calls. This is so that it can safely be called | |
386 | from a signal handler. */ | |
387 | static char * | |
388 | current_working_directory () | |
389 | { | |
390 | char *dir; | |
ccc6cda3 | 391 | static char d[PATH_MAX]; |
726f6388 JA |
392 | |
393 | dir = get_string_value ("PWD"); | |
394 | ||
ccc6cda3 | 395 | if (dir == 0 && the_current_working_directory && no_symbolic_links) |
726f6388 JA |
396 | dir = the_current_working_directory; |
397 | ||
ccc6cda3 | 398 | if (dir == 0) |
726f6388 | 399 | { |
ccc6cda3 | 400 | dir = getcwd (d, sizeof(d)); |
726f6388 JA |
401 | if (dir) |
402 | dir = d; | |
403 | } | |
404 | ||
ccc6cda3 | 405 | return (dir == 0) ? "<unknown>" : dir; |
726f6388 JA |
406 | } |
407 | ||
408 | /* Return the working directory for the current process. */ | |
409 | static char * | |
410 | job_working_directory () | |
411 | { | |
412 | char *dir; | |
413 | ||
414 | dir = get_string_value ("PWD"); | |
415 | if (dir) | |
416 | return (savestring (dir)); | |
417 | ||
418 | dir = get_working_directory ("job-working-directory"); | |
419 | if (dir) | |
420 | return (dir); | |
421 | ||
422 | return (savestring ("<unknown>")); | |
423 | } | |
424 | ||
425 | void | |
426 | making_children () | |
427 | { | |
428 | if (already_making_children) | |
429 | return; | |
430 | ||
431 | already_making_children = 1; | |
432 | start_pipeline (); | |
433 | } | |
434 | ||
435 | void | |
436 | stop_making_children () | |
437 | { | |
438 | already_making_children = 0; | |
439 | } | |
440 | ||
441 | void | |
442 | cleanup_the_pipeline () | |
443 | { | |
95732b49 JA |
444 | PROCESS *disposer; |
445 | sigset_t set, oset; | |
446 | ||
447 | BLOCK_CHILD (set, oset); | |
448 | disposer = the_pipeline; | |
449 | the_pipeline = (PROCESS *)NULL; | |
450 | UNBLOCK_CHILD (oset); | |
451 | ||
452 | if (disposer) | |
453 | discard_pipeline (disposer); | |
726f6388 JA |
454 | } |
455 | ||
2965eca9 CR |
456 | void |
457 | discard_last_procsub_child () | |
458 | { | |
459 | PROCESS *disposer; | |
460 | sigset_t set, oset; | |
461 | ||
462 | BLOCK_CHILD (set, oset); | |
463 | disposer = last_procsub_child; | |
464 | last_procsub_child = (PROCESS *)NULL; | |
465 | UNBLOCK_CHILD (oset); | |
466 | ||
467 | if (disposer) | |
468 | discard_pipeline (disposer); | |
469 | } | |
470 | ||
a0c0a00f CR |
471 | struct pipeline_saver * |
472 | alloc_pipeline_saver () | |
473 | { | |
474 | struct pipeline_saver *ret; | |
475 | ||
476 | ret = (struct pipeline_saver *)xmalloc (sizeof (struct pipeline_saver)); | |
477 | ret->pipeline = 0; | |
478 | ret->next = 0; | |
479 | return ret; | |
480 | } | |
481 | ||
ccc6cda3 JA |
482 | void |
483 | save_pipeline (clear) | |
484 | int clear; | |
485 | { | |
a0c0a00f CR |
486 | sigset_t set, oset; |
487 | struct pipeline_saver *saver; | |
488 | ||
489 | BLOCK_CHILD (set, oset); | |
490 | saver = alloc_pipeline_saver (); | |
491 | saver->pipeline = the_pipeline; | |
492 | saver->next = saved_pipeline; | |
493 | saved_pipeline = saver; | |
ccc6cda3 JA |
494 | if (clear) |
495 | the_pipeline = (PROCESS *)NULL; | |
95732b49 | 496 | saved_already_making_children = already_making_children; |
a0c0a00f | 497 | UNBLOCK_CHILD (oset); |
ccc6cda3 JA |
498 | } |
499 | ||
a0c0a00f | 500 | PROCESS * |
ccc6cda3 JA |
501 | restore_pipeline (discard) |
502 | int discard; | |
503 | { | |
504 | PROCESS *old_pipeline; | |
a0c0a00f CR |
505 | sigset_t set, oset; |
506 | struct pipeline_saver *saver; | |
ccc6cda3 | 507 | |
a0c0a00f | 508 | BLOCK_CHILD (set, oset); |
ccc6cda3 | 509 | old_pipeline = the_pipeline; |
a0c0a00f CR |
510 | the_pipeline = saved_pipeline->pipeline; |
511 | saver = saved_pipeline; | |
512 | saved_pipeline = saved_pipeline->next; | |
513 | free (saver); | |
ccc6cda3 | 514 | already_making_children = saved_already_making_children; |
a0c0a00f CR |
515 | UNBLOCK_CHILD (oset); |
516 | ||
89a92869 | 517 | if (discard && old_pipeline) |
a0c0a00f CR |
518 | { |
519 | discard_pipeline (old_pipeline); | |
520 | return ((PROCESS *)NULL); | |
521 | } | |
522 | return old_pipeline; | |
ccc6cda3 JA |
523 | } |
524 | ||
726f6388 JA |
525 | /* Start building a pipeline. */ |
526 | void | |
527 | start_pipeline () | |
528 | { | |
529 | if (the_pipeline) | |
530 | { | |
ccc6cda3 | 531 | cleanup_the_pipeline (); |
726f6388 JA |
532 | pipeline_pgrp = 0; |
533 | #if defined (PGRP_PIPE) | |
3185942a | 534 | sh_closepipe (pgrp_pipe); |
726f6388 JA |
535 | #endif |
536 | } | |
537 | ||
538 | #if defined (PGRP_PIPE) | |
539 | if (job_control) | |
540 | { | |
541 | if (pipe (pgrp_pipe) == -1) | |
3185942a | 542 | sys_error (_("start_pipeline: pgrp pipe")); |
726f6388 JA |
543 | } |
544 | #endif | |
545 | } | |
546 | ||
547 | /* Stop building a pipeline. Install the process list in the job array. | |
548 | This returns the index of the newly installed job. | |
549 | DEFERRED is a command structure to be executed upon satisfactory | |
550 | execution exit of this pipeline. */ | |
551 | int | |
552 | stop_pipeline (async, deferred) | |
553 | int async; | |
554 | COMMAND *deferred; | |
555 | { | |
556 | register int i, j; | |
ccc6cda3 | 557 | JOB *newjob; |
726f6388 JA |
558 | sigset_t set, oset; |
559 | ||
560 | BLOCK_CHILD (set, oset); | |
561 | ||
562 | #if defined (PGRP_PIPE) | |
563 | /* The parent closes the process group synchronization pipe. */ | |
3185942a | 564 | sh_closepipe (pgrp_pipe); |
726f6388 | 565 | #endif |
ccc6cda3 | 566 | |
726f6388 JA |
567 | cleanup_dead_jobs (); |
568 | ||
95732b49 | 569 | if (js.j_jobslots == 0) |
726f6388 | 570 | { |
95732b49 JA |
571 | js.j_jobslots = JOB_SLOTS; |
572 | jobs = (JOB **)xmalloc (js.j_jobslots * sizeof (JOB *)); | |
726f6388 JA |
573 | |
574 | /* Now blank out these new entries. */ | |
95732b49 | 575 | for (i = 0; i < js.j_jobslots; i++) |
726f6388 | 576 | jobs[i] = (JOB *)NULL; |
95732b49 JA |
577 | |
578 | js.j_firstj = js.j_lastj = js.j_njobs = 0; | |
726f6388 JA |
579 | } |
580 | ||
581 | /* Scan from the last slot backward, looking for the next free one. */ | |
b80f6443 | 582 | /* XXX - revisit this interactive assumption */ |
95732b49 | 583 | /* XXX - this way for now */ |
726f6388 JA |
584 | if (interactive) |
585 | { | |
95732b49 | 586 | for (i = js.j_jobslots; i; i--) |
726f6388 JA |
587 | if (jobs[i - 1]) |
588 | break; | |
589 | } | |
590 | else | |
591 | { | |
95732b49 JA |
592 | #if 0 |
593 | /* This wraps around, but makes it inconvenient to extend the array */ | |
594 | for (i = js.j_lastj+1; i != js.j_lastj; i++) | |
595 | { | |
596 | if (i >= js.j_jobslots) | |
597 | i = 0; | |
598 | if (jobs[i] == 0) | |
599 | break; | |
600 | } | |
601 | if (i == js.j_lastj) | |
602 | i = js.j_jobslots; | |
603 | #else | |
604 | /* This doesn't wrap around yet. */ | |
605 | for (i = js.j_lastj ? js.j_lastj + 1 : js.j_lastj; i < js.j_jobslots; i++) | |
ccc6cda3 | 606 | if (jobs[i] == 0) |
726f6388 | 607 | break; |
95732b49 | 608 | #endif |
726f6388 JA |
609 | } |
610 | ||
611 | /* Do we need more room? */ | |
7117c2d2 JA |
612 | |
613 | /* First try compaction */ | |
95732b49 | 614 | if ((interactive_shell == 0 || subshell_environment) && i == js.j_jobslots && js.j_jobslots >= MAX_JOBS_IN_ARRAY) |
7117c2d2 JA |
615 | i = compact_jobs_list (0); |
616 | ||
617 | /* If we can't compact, reallocate */ | |
95732b49 | 618 | if (i == js.j_jobslots) |
726f6388 | 619 | { |
95732b49 JA |
620 | js.j_jobslots += JOB_SLOTS; |
621 | jobs = (JOB **)xrealloc (jobs, (js.j_jobslots * sizeof (JOB *))); | |
726f6388 | 622 | |
95732b49 | 623 | for (j = i; j < js.j_jobslots; j++) |
726f6388 JA |
624 | jobs[j] = (JOB *)NULL; |
625 | } | |
626 | ||
627 | /* Add the current pipeline to the job list. */ | |
628 | if (the_pipeline) | |
629 | { | |
630 | register PROCESS *p; | |
95732b49 | 631 | int any_running, any_stopped, n; |
726f6388 JA |
632 | |
633 | newjob = (JOB *)xmalloc (sizeof (JOB)); | |
634 | ||
95732b49 | 635 | for (n = 1, p = the_pipeline; p->next != the_pipeline; n++, p = p->next) |
ccc6cda3 | 636 | ; |
726f6388 JA |
637 | p->next = (PROCESS *)NULL; |
638 | newjob->pipe = REVERSE_LIST (the_pipeline, PROCESS *); | |
ccc6cda3 JA |
639 | for (p = newjob->pipe; p->next; p = p->next) |
640 | ; | |
726f6388 JA |
641 | p->next = newjob->pipe; |
642 | ||
643 | the_pipeline = (PROCESS *)NULL; | |
644 | newjob->pgrp = pipeline_pgrp; | |
645 | pipeline_pgrp = 0; | |
646 | ||
647 | newjob->flags = 0; | |
648 | ||
649 | /* Flag to see if in another pgrp. */ | |
650 | if (job_control) | |
651 | newjob->flags |= J_JOBCONTROL; | |
652 | ||
653 | /* Set the state of this pipeline. */ | |
ccc6cda3 | 654 | p = newjob->pipe; |
95732b49 | 655 | any_running = any_stopped = 0; |
ccc6cda3 JA |
656 | do |
657 | { | |
95732b49 JA |
658 | any_running |= PRUNNING (p); |
659 | any_stopped |= PSTOPPED (p); | |
ccc6cda3 JA |
660 | p = p->next; |
661 | } | |
662 | while (p != newjob->pipe); | |
726f6388 | 663 | |
95732b49 | 664 | newjob->state = any_running ? JRUNNING : (any_stopped ? JSTOPPED : JDEAD); |
726f6388 JA |
665 | newjob->wd = job_working_directory (); |
666 | newjob->deferred = deferred; | |
667 | ||
f73dda09 | 668 | newjob->j_cleanup = (sh_vptrfunc_t *)NULL; |
ccc6cda3 JA |
669 | newjob->cleanarg = (PTR_T) NULL; |
670 | ||
726f6388 | 671 | jobs[i] = newjob; |
ccc6cda3 JA |
672 | if (newjob->state == JDEAD && (newjob->flags & J_FOREGROUND)) |
673 | setjstatus (i); | |
95732b49 JA |
674 | if (newjob->state == JDEAD) |
675 | { | |
676 | js.c_reaped += n; /* wouldn't have been done since this was not part of a job */ | |
677 | js.j_ndead++; | |
678 | } | |
679 | js.c_injobs += n; | |
680 | ||
681 | js.j_lastj = i; | |
682 | js.j_njobs++; | |
726f6388 | 683 | } |
ccc6cda3 JA |
684 | else |
685 | newjob = (JOB *)NULL; | |
726f6388 | 686 | |
95732b49 JA |
687 | if (newjob) |
688 | js.j_lastmade = newjob; | |
689 | ||
726f6388 JA |
690 | if (async) |
691 | { | |
692 | if (newjob) | |
95732b49 JA |
693 | { |
694 | newjob->flags &= ~J_FOREGROUND; | |
695 | newjob->flags |= J_ASYNC; | |
696 | js.j_lastasync = newjob; | |
697 | } | |
726f6388 JA |
698 | reset_current (); |
699 | } | |
700 | else | |
701 | { | |
702 | if (newjob) | |
703 | { | |
704 | newjob->flags |= J_FOREGROUND; | |
705 | /* | |
706 | * !!!!! NOTE !!!!! (chet@ins.cwru.edu) | |
707 | * | |
708 | * The currently-accepted job control wisdom says to set the | |
709 | * terminal's process group n+1 times in an n-step pipeline: | |
710 | * once in the parent and once in each child. This is where | |
711 | * the parent gives it away. | |
712 | * | |
0628567a | 713 | * Don't give the terminal away if this shell is an asynchronous |
a0c0a00f CR |
714 | * subshell or if we're a (presumably non-interactive) shell running |
715 | * in the background. | |
0628567a | 716 | * |
726f6388 | 717 | */ |
a0c0a00f | 718 | if (job_control && newjob->pgrp && (subshell_environment&SUBSHELL_ASYNC) == 0 && running_in_background == 0) |
3185942a | 719 | maybe_give_terminal_to (shell_pgrp, newjob->pgrp, 0); |
726f6388 JA |
720 | } |
721 | } | |
722 | ||
723 | stop_making_children (); | |
724 | UNBLOCK_CHILD (oset); | |
495aee44 | 725 | return (newjob ? i : js.j_current); |
95732b49 JA |
726 | } |
727 | ||
728 | /* Functions to manage the list of exited background pids whose status has | |
a0c0a00f | 729 | been saved. |
95732b49 | 730 | |
a0c0a00f CR |
731 | pidstat_table: |
732 | ||
733 | The current implementation is a hash table using a single (separate) arena | |
734 | for storage that can be allocated and freed as a unit. The size of the hash | |
735 | table is a multiple of PIDSTAT_TABLE_SZ (4096) and multiple PIDs that hash | |
736 | to the same value are chained through the bucket_next and bucket_prev | |
737 | pointers (basically coalesced hashing for collision resolution). | |
738 | ||
739 | bgpids.storage: | |
740 | ||
741 | All pid/status storage is done using the circular buffer bgpids.storage. | |
742 | This must contain at least js.c_childmax entries. The circular buffer is | |
743 | used to supply the ordered list Posix requires ("the last CHILD_MAX | |
744 | processes"). To avoid searching the entire storage table for a given PID, | |
745 | the hash table (pidstat_table) holds pointers into the storage arena and | |
746 | uses a doubly-linked list of cells (bucket_next/bucket_prev, also pointers | |
747 | into the arena) to implement collision resolution. */ | |
748 | ||
749 | /* The number of elements in bgpids.storage always has to be > js.c_childmax for | |
750 | the circular buffer to work right. */ | |
751 | static void | |
752 | bgp_resize () | |
753 | { | |
754 | ps_index_t nsize; | |
755 | ps_index_t psi; | |
756 | ||
757 | if (bgpids.nalloc == 0) | |
758 | { | |
759 | /* invalidate hash table when bgpids table is reallocated */ | |
760 | for (psi = 0; psi < PIDSTAT_TABLE_SZ; psi++) | |
761 | pidstat_table[psi] = NO_PIDSTAT; | |
762 | nsize = BGPIDS_TABLE_SZ; /* should be power of 2 */ | |
763 | bgpids.head = 0; | |
764 | } | |
765 | else | |
766 | nsize = bgpids.nalloc; | |
767 | ||
768 | while (nsize < js.c_childmax) | |
769 | nsize *= 2; | |
770 | ||
771 | if (bgpids.nalloc < js.c_childmax) | |
772 | { | |
773 | bgpids.storage = (struct pidstat *)xrealloc (bgpids.storage, nsize * sizeof (struct pidstat)); | |
774 | ||
775 | for (psi = bgpids.nalloc; psi < nsize; psi++) | |
776 | bgpids.storage[psi].pid = NO_PID; | |
777 | ||
778 | bgpids.nalloc = nsize; | |
779 | ||
780 | } | |
781 | else if (bgpids.head >= bgpids.nalloc) /* wrap around */ | |
782 | bgpids.head = 0; | |
783 | } | |
784 | ||
785 | static ps_index_t | |
786 | bgp_getindex () | |
787 | { | |
788 | ps_index_t psi; | |
789 | ||
790 | if (bgpids.nalloc < js.c_childmax || bgpids.head >= bgpids.nalloc) | |
791 | bgp_resize (); | |
792 | ||
793 | pshash_delindex (bgpids.head); /* XXX - clear before reusing */ | |
794 | return bgpids.head++; | |
795 | } | |
796 | ||
797 | static ps_index_t * | |
798 | pshash_getbucket (pid) | |
95732b49 | 799 | pid_t pid; |
95732b49 | 800 | { |
a0c0a00f | 801 | unsigned long hash; /* XXX - u_bits32_t */ |
95732b49 | 802 | |
a0c0a00f CR |
803 | hash = pid * 0x9e370001UL; |
804 | return (&pidstat_table[hash % PIDSTAT_TABLE_SZ]); | |
726f6388 JA |
805 | } |
806 | ||
95732b49 JA |
807 | static struct pidstat * |
808 | bgp_add (pid, status) | |
809 | pid_t pid; | |
810 | int status; | |
811 | { | |
a0c0a00f | 812 | ps_index_t *bucket, psi; |
95732b49 JA |
813 | struct pidstat *ps; |
814 | ||
a0c0a00f CR |
815 | bucket = pshash_getbucket (pid); |
816 | psi = bgp_getindex (); | |
817 | ps = &bgpids.storage[psi]; | |
818 | ||
819 | ps->pid = pid; | |
820 | ps->status = status; | |
821 | ps->bucket_next = *bucket; | |
822 | ps->bucket_prev = NO_PIDSTAT; | |
95732b49 | 823 | |
95732b49 JA |
824 | bgpids.npid++; |
825 | ||
a0c0a00f | 826 | #if 0 |
95732b49 JA |
827 | if (bgpids.npid > js.c_childmax) |
828 | bgp_prune (); | |
a0c0a00f CR |
829 | #endif |
830 | ||
831 | if (ps->bucket_next != NO_PIDSTAT) | |
832 | bgpids.storage[ps->bucket_next].bucket_prev = psi; | |
833 | ||
834 | *bucket = psi; /* set chain head in hash table */ | |
95732b49 JA |
835 | |
836 | return ps; | |
837 | } | |
838 | ||
a0c0a00f CR |
839 | static void |
840 | pshash_delindex (psi) | |
841 | ps_index_t psi; | |
842 | { | |
843 | struct pidstat *ps; | |
844 | ||
845 | ps = &bgpids.storage[psi]; | |
846 | if (ps->pid == NO_PID) | |
847 | return; | |
848 | ||
849 | if (ps->bucket_next != NO_PID) | |
850 | bgpids.storage[ps->bucket_next].bucket_prev = ps->bucket_prev; | |
851 | if (ps->bucket_prev != NO_PID) | |
852 | bgpids.storage[ps->bucket_prev].bucket_next = ps->bucket_next; | |
853 | else | |
854 | *(pshash_getbucket (ps->pid)) = ps->bucket_next; | |
855 | } | |
856 | ||
95732b49 JA |
857 | static int |
858 | bgp_delete (pid) | |
859 | pid_t pid; | |
860 | { | |
a0c0a00f | 861 | ps_index_t psi; |
95732b49 | 862 | |
a0c0a00f CR |
863 | if (bgpids.storage == 0 || bgpids.nalloc == 0 || bgpids.npid == 0) |
864 | return 0; | |
95732b49 | 865 | |
a0c0a00f CR |
866 | /* Search chain using hash to find bucket in pidstat_table */ |
867 | for (psi = *(pshash_getbucket (pid)); psi != NO_PIDSTAT; psi = bgpids.storage[psi].bucket_next) | |
868 | if (bgpids.storage[psi].pid == pid) | |
869 | break; | |
870 | ||
871 | if (psi == NO_PIDSTAT) | |
95732b49 JA |
872 | return 0; /* not found */ |
873 | ||
874 | #if defined (DEBUG) | |
875 | itrace("bgp_delete: deleting %d", pid); | |
876 | #endif | |
877 | ||
a0c0a00f | 878 | pshash_delindex (psi); /* hash table management */ |
95732b49 JA |
879 | |
880 | bgpids.npid--; | |
95732b49 JA |
881 | return 1; |
882 | } | |
883 | ||
884 | /* Clear out the list of saved statuses */ | |
885 | static void | |
886 | bgp_clear () | |
887 | { | |
a0c0a00f CR |
888 | if (bgpids.storage == 0 || bgpids.nalloc == 0) |
889 | return; | |
890 | ||
891 | free (bgpids.storage); | |
892 | ||
893 | bgpids.storage = 0; | |
894 | bgpids.nalloc = 0; | |
895 | bgpids.head = 0; | |
95732b49 | 896 | |
95732b49 JA |
897 | bgpids.npid = 0; |
898 | } | |
899 | ||
900 | /* Search for PID in the list of saved background pids; return its status if | |
a0c0a00f CR |
901 | found. If not found, return -1. We hash to the right spot in pidstat_table |
902 | and follow the bucket chain to the end. */ | |
95732b49 JA |
903 | static int |
904 | bgp_search (pid) | |
905 | pid_t pid; | |
906 | { | |
a0c0a00f CR |
907 | ps_index_t psi; |
908 | ||
909 | if (bgpids.storage == 0 || bgpids.nalloc == 0 || bgpids.npid == 0) | |
910 | return -1; | |
911 | ||
912 | /* Search chain using hash to find bucket in pidstat_table */ | |
913 | for (psi = *(pshash_getbucket (pid)); psi != NO_PIDSTAT; psi = bgpids.storage[psi].bucket_next) | |
914 | if (bgpids.storage[psi].pid == pid) | |
915 | return (bgpids.storage[psi].status); | |
95732b49 | 916 | |
95732b49 JA |
917 | return -1; |
918 | } | |
919 | ||
a0c0a00f | 920 | #if 0 |
95732b49 JA |
921 | static void |
922 | bgp_prune () | |
923 | { | |
a0c0a00f | 924 | return; |
95732b49 | 925 | } |
a0c0a00f | 926 | #endif |
3185942a | 927 | |
95732b49 JA |
928 | /* Reset the values of js.j_lastj and js.j_firstj after one or both have |
929 | been deleted. The caller should check whether js.j_njobs is 0 before | |
930 | calling this. This wraps around, but the rest of the code does not. At | |
931 | this point, it should not matter. */ | |
932 | static void | |
933 | reset_job_indices () | |
934 | { | |
935 | int old; | |
936 | ||
937 | if (jobs[js.j_firstj] == 0) | |
938 | { | |
939 | old = js.j_firstj++; | |
f1be666c JA |
940 | if (old >= js.j_jobslots) |
941 | old = js.j_jobslots - 1; | |
95732b49 JA |
942 | while (js.j_firstj != old) |
943 | { | |
944 | if (js.j_firstj >= js.j_jobslots) | |
945 | js.j_firstj = 0; | |
f1be666c | 946 | if (jobs[js.j_firstj] || js.j_firstj == old) /* needed if old == 0 */ |
95732b49 JA |
947 | break; |
948 | js.j_firstj++; | |
949 | } | |
950 | if (js.j_firstj == old) | |
951 | js.j_firstj = js.j_lastj = js.j_njobs = 0; | |
952 | } | |
953 | if (jobs[js.j_lastj] == 0) | |
954 | { | |
955 | old = js.j_lastj--; | |
f1be666c JA |
956 | if (old < 0) |
957 | old = 0; | |
95732b49 JA |
958 | while (js.j_lastj != old) |
959 | { | |
960 | if (js.j_lastj < 0) | |
961 | js.j_lastj = js.j_jobslots - 1; | |
f1be666c | 962 | if (jobs[js.j_lastj] || js.j_lastj == old) /* needed if old == js.j_jobslots */ |
95732b49 JA |
963 | break; |
964 | js.j_lastj--; | |
965 | } | |
966 | if (js.j_lastj == old) | |
967 | js.j_firstj = js.j_lastj = js.j_njobs = 0; | |
968 | } | |
969 | } | |
970 | ||
726f6388 JA |
971 | /* Delete all DEAD jobs that the user had received notification about. */ |
972 | static void | |
973 | cleanup_dead_jobs () | |
974 | { | |
975 | register int i; | |
7117c2d2 | 976 | int os; |
726f6388 | 977 | |
95732b49 | 978 | if (js.j_jobslots == 0 || jobs_list_frozen) |
726f6388 JA |
979 | return; |
980 | ||
7117c2d2 | 981 | QUEUE_SIGCHLD(os); |
726f6388 | 982 | |
0628567a | 983 | /* XXX could use js.j_firstj and js.j_lastj here */ |
95732b49 JA |
984 | for (i = 0; i < js.j_jobslots; i++) |
985 | { | |
986 | #if defined (DEBUG) | |
987 | if (i < js.j_firstj && jobs[i]) | |
988 | itrace("cleanup_dead_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj); | |
0628567a JA |
989 | if (i > js.j_lastj && jobs[i]) |
990 | itrace("cleanup_dead_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj); | |
95732b49 | 991 | #endif |
726f6388 | 992 | |
95732b49 JA |
993 | if (jobs[i] && DEADJOB (i) && IS_NOTIFIED (i)) |
994 | delete_job (i, 0); | |
995 | } | |
17345e5a | 996 | |
a0c0a00f CR |
997 | #if defined (PROCESS_SUBSTITUTION) |
998 | if (last_procsub_child && last_procsub_child->running == PS_DONE) | |
999 | { | |
1000 | bgp_add (last_procsub_child->pid, process_exit_status (last_procsub_child->status)); /* XXX */ | |
1001 | discard_pipeline (last_procsub_child); | |
1002 | last_procsub_child = (PROCESS *)NULL; | |
1003 | } | |
1004 | #endif | |
1005 | ||
17345e5a JA |
1006 | #if defined (COPROCESS_SUPPORT) |
1007 | coproc_reap (); | |
1008 | #endif | |
1009 | ||
7117c2d2 JA |
1010 | UNQUEUE_SIGCHLD(os); |
1011 | } | |
1012 | ||
7117c2d2 | 1013 | static int |
95732b49 | 1014 | processes_in_job (job) |
3185942a | 1015 | int job; |
7117c2d2 | 1016 | { |
95732b49 JA |
1017 | int nproc; |
1018 | register PROCESS *p; | |
7117c2d2 | 1019 | |
95732b49 JA |
1020 | nproc = 0; |
1021 | p = jobs[job]->pipe; | |
1022 | do | |
1023 | { | |
1024 | p = p->next; | |
1025 | nproc++; | |
1026 | } | |
1027 | while (p != jobs[job]->pipe); | |
7117c2d2 | 1028 | |
95732b49 JA |
1029 | return nproc; |
1030 | } | |
7117c2d2 | 1031 | |
0628567a JA |
1032 | static void |
1033 | delete_old_job (pid) | |
1034 | pid_t pid; | |
1035 | { | |
1036 | PROCESS *p; | |
1037 | int job; | |
1038 | ||
1039 | job = find_job (pid, 0, &p); | |
1040 | if (job != NO_JOB) | |
1041 | { | |
1042 | #ifdef DEBUG | |
1043 | itrace ("delete_old_job: found pid %d in job %d with state %d", pid, job, jobs[job]->state); | |
1044 | #endif | |
1045 | if (JOBSTATE (job) == JDEAD) | |
1046 | delete_job (job, DEL_NOBGPID); | |
1047 | else | |
1048 | { | |
ac50fbac CR |
1049 | #ifdef DEBUG |
1050 | internal_warning (_("forked pid %d appears in running job %d"), pid, job+1); | |
1051 | #endif | |
0628567a JA |
1052 | if (p) |
1053 | p->pid = 0; | |
1054 | } | |
1055 | } | |
1056 | } | |
1057 | ||
95732b49 JA |
1058 | /* Reallocate and compress the jobs list. This returns with a jobs array |
1059 | whose size is a multiple of JOB_SLOTS and can hold the current number of | |
1060 | jobs. Heuristics are used to minimize the number of new reallocs. */ | |
1061 | static void | |
1062 | realloc_jobs_list () | |
1063 | { | |
1064 | sigset_t set, oset; | |
0628567a | 1065 | int nsize, i, j, ncur, nprev; |
95732b49 | 1066 | JOB **nlist; |
7117c2d2 | 1067 | |
0628567a | 1068 | ncur = nprev = NO_JOB; |
95732b49 JA |
1069 | nsize = ((js.j_njobs + JOB_SLOTS - 1) / JOB_SLOTS); |
1070 | nsize *= JOB_SLOTS; | |
1071 | i = js.j_njobs % JOB_SLOTS; | |
1072 | if (i == 0 || i > (JOB_SLOTS >> 1)) | |
1073 | nsize += JOB_SLOTS; | |
7117c2d2 | 1074 | |
95732b49 | 1075 | BLOCK_CHILD (set, oset); |
0628567a JA |
1076 | nlist = (js.j_jobslots == nsize) ? jobs : (JOB **) xmalloc (nsize * sizeof (JOB *)); |
1077 | ||
3185942a | 1078 | js.c_reaped = js.j_ndead = 0; |
95732b49 | 1079 | for (i = j = 0; i < js.j_jobslots; i++) |
7117c2d2 | 1080 | if (jobs[i]) |
0628567a JA |
1081 | { |
1082 | if (i == js.j_current) | |
1083 | ncur = j; | |
1084 | if (i == js.j_previous) | |
1085 | nprev = j; | |
1086 | nlist[j++] = jobs[i]; | |
3185942a JA |
1087 | if (jobs[i]->state == JDEAD) |
1088 | { | |
1089 | js.j_ndead++; | |
1090 | js.c_reaped += processes_in_job (i); | |
1091 | } | |
0628567a JA |
1092 | } |
1093 | ||
ac50fbac | 1094 | #if 0 |
0628567a JA |
1095 | itrace ("realloc_jobs_list: resize jobs list from %d to %d", js.j_jobslots, nsize); |
1096 | itrace ("realloc_jobs_list: j_lastj changed from %d to %d", js.j_lastj, (j > 0) ? j - 1 : 0); | |
3185942a JA |
1097 | itrace ("realloc_jobs_list: j_njobs changed from %d to %d", js.j_njobs, j); |
1098 | itrace ("realloc_jobs_list: js.j_ndead %d js.c_reaped %d", js.j_ndead, js.c_reaped); | |
0628567a | 1099 | #endif |
7117c2d2 | 1100 | |
95732b49 | 1101 | js.j_firstj = 0; |
0628567a JA |
1102 | js.j_lastj = (j > 0) ? j - 1 : 0; |
1103 | js.j_njobs = j; | |
95732b49 | 1104 | js.j_jobslots = nsize; |
7117c2d2 | 1105 | |
0628567a JA |
1106 | /* Zero out remaining slots in new jobs list */ |
1107 | for ( ; j < nsize; j++) | |
1108 | nlist[j] = (JOB *)NULL; | |
1109 | ||
1110 | if (jobs != nlist) | |
1111 | { | |
1112 | free (jobs); | |
1113 | jobs = nlist; | |
1114 | } | |
1115 | ||
1116 | if (ncur != NO_JOB) | |
1117 | js.j_current = ncur; | |
1118 | if (nprev != NO_JOB) | |
1119 | js.j_previous = nprev; | |
1120 | ||
1121 | /* Need to reset these */ | |
1122 | if (js.j_current == NO_JOB || js.j_previous == NO_JOB || js.j_current > js.j_lastj || js.j_previous > js.j_lastj) | |
1123 | reset_current (); | |
1124 | ||
ac50fbac | 1125 | #if 0 |
0628567a JA |
1126 | itrace ("realloc_jobs_list: reset js.j_current (%d) and js.j_previous (%d)", js.j_current, js.j_previous); |
1127 | #endif | |
7117c2d2 | 1128 | |
726f6388 | 1129 | UNBLOCK_CHILD (oset); |
95732b49 JA |
1130 | } |
1131 | ||
ac50fbac | 1132 | /* Compact the jobs list by removing dead jobs. Assume that we have filled |
95732b49 JA |
1133 | the jobs array to some predefined maximum. Called when the shell is not |
1134 | the foreground process (subshell_environment != 0). Returns the first | |
1135 | available slot in the compacted list. If that value is js.j_jobslots, then | |
0628567a | 1136 | the list needs to be reallocated. The jobs array may be in new memory if |
95732b49 JA |
1137 | this returns > 0 and < js.j_jobslots. FLAGS is reserved for future use. */ |
1138 | static int | |
1139 | compact_jobs_list (flags) | |
1140 | int flags; | |
1141 | { | |
1142 | if (js.j_jobslots == 0 || jobs_list_frozen) | |
1143 | return js.j_jobslots; | |
1144 | ||
1145 | reap_dead_jobs (); | |
1146 | realloc_jobs_list (); | |
7117c2d2 | 1147 | |
ac50fbac | 1148 | #if 0 |
f1be666c JA |
1149 | itrace("compact_jobs_list: returning %d", (js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0); |
1150 | #endif | |
1151 | ||
1152 | return ((js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0); | |
726f6388 JA |
1153 | } |
1154 | ||
1155 | /* Delete the job at INDEX from the job list. Must be called | |
1156 | with SIGCHLD blocked. */ | |
1157 | void | |
0628567a JA |
1158 | delete_job (job_index, dflags) |
1159 | int job_index, dflags; | |
726f6388 JA |
1160 | { |
1161 | register JOB *temp; | |
95732b49 | 1162 | PROCESS *proc; |
0628567a | 1163 | int ndel; |
726f6388 | 1164 | |
95732b49 | 1165 | if (js.j_jobslots == 0 || jobs_list_frozen) |
726f6388 JA |
1166 | return; |
1167 | ||
0628567a | 1168 | if ((dflags & DEL_WARNSTOPPED) && subshell_environment == 0 && STOPPED (job_index)) |
b80f6443 | 1169 | internal_warning (_("deleting stopped job %d with process group %ld"), job_index+1, (long)jobs[job_index]->pgrp); |
726f6388 | 1170 | temp = jobs[job_index]; |
0628567a JA |
1171 | if (temp == 0) |
1172 | return; | |
726f6388 | 1173 | |
a0c0a00f | 1174 | if ((dflags & DEL_NOBGPID) == 0 && (temp->flags & (J_ASYNC|J_FOREGROUND)) == J_ASYNC) |
0628567a JA |
1175 | { |
1176 | proc = find_last_proc (job_index, 0); | |
0628567a JA |
1177 | if (proc) |
1178 | bgp_add (proc->pid, process_exit_status (proc->status)); | |
1179 | } | |
95732b49 | 1180 | |
726f6388 | 1181 | jobs[job_index] = (JOB *)NULL; |
95732b49 JA |
1182 | if (temp == js.j_lastmade) |
1183 | js.j_lastmade = 0; | |
1184 | else if (temp == js.j_lastasync) | |
1185 | js.j_lastasync = 0; | |
1186 | ||
726f6388 | 1187 | free (temp->wd); |
95732b49 JA |
1188 | ndel = discard_pipeline (temp->pipe); |
1189 | ||
1190 | js.c_injobs -= ndel; | |
1191 | if (temp->state == JDEAD) | |
1192 | { | |
1193 | js.c_reaped -= ndel; | |
1194 | js.j_ndead--; | |
1195 | if (js.c_reaped < 0) | |
1196 | { | |
1197 | #ifdef DEBUG | |
1198 | itrace("delete_job (%d pgrp %d): js.c_reaped (%d) < 0 ndel = %d js.j_ndead = %d", job_index, temp->pgrp, js.c_reaped, ndel, js.j_ndead); | |
1199 | #endif | |
1200 | js.c_reaped = 0; | |
1201 | } | |
1202 | } | |
726f6388 JA |
1203 | |
1204 | if (temp->deferred) | |
1205 | dispose_command (temp->deferred); | |
1206 | ||
1207 | free (temp); | |
95732b49 JA |
1208 | |
1209 | js.j_njobs--; | |
1210 | if (js.j_njobs == 0) | |
1211 | js.j_firstj = js.j_lastj = 0; | |
1212 | else if (jobs[js.j_firstj] == 0 || jobs[js.j_lastj] == 0) | |
1213 | reset_job_indices (); | |
f1be666c JA |
1214 | |
1215 | if (job_index == js.j_current || job_index == js.j_previous) | |
1216 | reset_current (); | |
726f6388 JA |
1217 | } |
1218 | ||
ccc6cda3 JA |
1219 | /* Must be called with SIGCHLD blocked. */ |
1220 | void | |
1221 | nohup_job (job_index) | |
1222 | int job_index; | |
1223 | { | |
1224 | register JOB *temp; | |
1225 | ||
95732b49 | 1226 | if (js.j_jobslots == 0) |
cce855bc JA |
1227 | return; |
1228 | ||
d166f048 | 1229 | if (temp = jobs[job_index]) |
ccc6cda3 JA |
1230 | temp->flags |= J_NOHUP; |
1231 | } | |
1232 | ||
726f6388 | 1233 | /* Get rid of the data structure associated with a process chain. */ |
a0c0a00f | 1234 | int |
726f6388 JA |
1235 | discard_pipeline (chain) |
1236 | register PROCESS *chain; | |
1237 | { | |
1238 | register PROCESS *this, *next; | |
95732b49 | 1239 | int n; |
726f6388 JA |
1240 | |
1241 | this = chain; | |
95732b49 | 1242 | n = 0; |
726f6388 JA |
1243 | do |
1244 | { | |
1245 | next = this->next; | |
ccc6cda3 | 1246 | FREE (this->command); |
726f6388 | 1247 | free (this); |
95732b49 | 1248 | n++; |
726f6388 JA |
1249 | this = next; |
1250 | } | |
1251 | while (this != chain); | |
95732b49 JA |
1252 | |
1253 | return n; | |
726f6388 JA |
1254 | } |
1255 | ||
1256 | /* Add this process to the chain being built in the_pipeline. | |
1257 | NAME is the command string that will be exec'ed later. | |
1258 | PID is the process id of the child. */ | |
1259 | static void | |
1260 | add_process (name, pid) | |
1261 | char *name; | |
1262 | pid_t pid; | |
1263 | { | |
ccc6cda3 | 1264 | PROCESS *t, *p; |
726f6388 | 1265 | |
95732b49 JA |
1266 | #if defined (RECYCLES_PIDS) |
1267 | int j; | |
1268 | p = find_process (pid, 0, &j); | |
1269 | if (p) | |
1270 | { | |
1271 | # ifdef DEBUG | |
1272 | if (j == NO_JOB) | |
3185942a | 1273 | internal_warning (_("add_process: process %5ld (%s) in the_pipeline"), (long)p->pid, p->command); |
95732b49 JA |
1274 | # endif |
1275 | if (PALIVE (p)) | |
3185942a | 1276 | internal_warning (_("add_process: pid %5ld (%s) marked as still alive"), (long)p->pid, p->command); |
95732b49 JA |
1277 | p->running = PS_RECYCLED; /* mark as recycled */ |
1278 | } | |
1279 | #endif | |
1280 | ||
ccc6cda3 | 1281 | t = (PROCESS *)xmalloc (sizeof (PROCESS)); |
726f6388 JA |
1282 | t->next = the_pipeline; |
1283 | t->pid = pid; | |
1284 | WSTATUS (t->status) = 0; | |
7117c2d2 | 1285 | t->running = PS_RUNNING; |
726f6388 JA |
1286 | t->command = name; |
1287 | the_pipeline = t; | |
1288 | ||
ccc6cda3 | 1289 | if (t->next == 0) |
726f6388 JA |
1290 | t->next = t; |
1291 | else | |
1292 | { | |
ccc6cda3 | 1293 | p = t->next; |
726f6388 JA |
1294 | while (p->next != t->next) |
1295 | p = p->next; | |
1296 | p->next = t; | |
1297 | } | |
1298 | } | |
1299 | ||
495aee44 CR |
1300 | /* Create a (dummy) PROCESS with NAME, PID, and STATUS, and make it the last |
1301 | process in jobs[JID]->pipe. Used by the lastpipe code. */ | |
1302 | void | |
1303 | append_process (name, pid, status, jid) | |
1304 | char *name; | |
1305 | pid_t pid; | |
1306 | int status; | |
1307 | int jid; | |
1308 | { | |
1309 | PROCESS *t, *p; | |
1310 | ||
1311 | t = (PROCESS *)xmalloc (sizeof (PROCESS)); | |
1312 | t->next = (PROCESS *)NULL; | |
1313 | t->pid = pid; | |
1314 | /* set process exit status using offset discovered by configure */ | |
1315 | t->status = (status & 0xff) << WEXITSTATUS_OFFSET; | |
1316 | t->running = PS_DONE; | |
1317 | t->command = name; | |
1318 | ||
1319 | js.c_reaped++; /* XXX */ | |
1320 | ||
1321 | for (p = jobs[jid]->pipe; p->next != jobs[jid]->pipe; p = p->next) | |
1322 | ; | |
1323 | p->next = t; | |
1324 | t->next = jobs[jid]->pipe; | |
1325 | } | |
1326 | ||
726f6388 JA |
1327 | #if 0 |
1328 | /* Take the last job and make it the first job. Must be called with | |
1329 | SIGCHLD blocked. */ | |
ccc6cda3 | 1330 | int |
726f6388 JA |
1331 | rotate_the_pipeline () |
1332 | { | |
1333 | PROCESS *p; | |
1334 | ||
1335 | if (the_pipeline->next == the_pipeline) | |
1336 | return; | |
1337 | for (p = the_pipeline; p->next != the_pipeline; p = p->next) | |
1338 | ; | |
1339 | the_pipeline = p; | |
1340 | } | |
1341 | ||
1342 | /* Reverse the order of the processes in the_pipeline. Must be called with | |
1343 | SIGCHLD blocked. */ | |
ccc6cda3 | 1344 | int |
726f6388 JA |
1345 | reverse_the_pipeline () |
1346 | { | |
1347 | PROCESS *p, *n; | |
1348 | ||
1349 | if (the_pipeline->next == the_pipeline) | |
1350 | return; | |
1351 | ||
1352 | for (p = the_pipeline; p->next != the_pipeline; p = p->next) | |
1353 | ; | |
1354 | p->next = (PROCESS *)NULL; | |
1355 | ||
1356 | n = REVERSE_LIST (the_pipeline, PROCESS *); | |
1357 | ||
1358 | the_pipeline = n; | |
1359 | for (p = the_pipeline; p->next; p = p->next) | |
1360 | ; | |
1361 | p->next = the_pipeline; | |
1362 | } | |
1363 | #endif | |
1364 | ||
1365 | /* Map FUNC over the list of jobs. If FUNC returns non-zero, | |
1366 | then it is time to stop mapping, and that is the return value | |
1367 | for map_over_jobs. FUNC is called with a JOB, arg1, arg2, | |
1368 | and INDEX. */ | |
1369 | static int | |
1370 | map_over_jobs (func, arg1, arg2) | |
f73dda09 | 1371 | sh_job_map_func_t *func; |
726f6388 JA |
1372 | int arg1, arg2; |
1373 | { | |
1374 | register int i; | |
1375 | int result; | |
1376 | sigset_t set, oset; | |
1377 | ||
95732b49 | 1378 | if (js.j_jobslots == 0) |
28ef6c31 JA |
1379 | return 0; |
1380 | ||
726f6388 | 1381 | BLOCK_CHILD (set, oset); |
726f6388 | 1382 | |
95732b49 JA |
1383 | /* XXX could use js.j_firstj here */ |
1384 | for (i = result = 0; i < js.j_jobslots; i++) | |
726f6388 | 1385 | { |
95732b49 JA |
1386 | #if defined (DEBUG) |
1387 | if (i < js.j_firstj && jobs[i]) | |
1388 | itrace("map_over_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj); | |
0628567a JA |
1389 | if (i > js.j_lastj && jobs[i]) |
1390 | itrace("map_over_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj); | |
95732b49 | 1391 | #endif |
726f6388 JA |
1392 | if (jobs[i]) |
1393 | { | |
1394 | result = (*func)(jobs[i], arg1, arg2, i); | |
1395 | if (result) | |
1396 | break; | |
1397 | } | |
1398 | } | |
1399 | ||
1400 | UNBLOCK_CHILD (oset); | |
ccc6cda3 | 1401 | |
726f6388 JA |
1402 | return (result); |
1403 | } | |
1404 | ||
1405 | /* Cause all the jobs in the current pipeline to exit. */ | |
1406 | void | |
1407 | terminate_current_pipeline () | |
1408 | { | |
1409 | if (pipeline_pgrp && pipeline_pgrp != shell_pgrp) | |
1410 | { | |
1411 | killpg (pipeline_pgrp, SIGTERM); | |
1412 | killpg (pipeline_pgrp, SIGCONT); | |
1413 | } | |
1414 | } | |
1415 | ||
1416 | /* Cause all stopped jobs to exit. */ | |
1417 | void | |
1418 | terminate_stopped_jobs () | |
1419 | { | |
1420 | register int i; | |
1421 | ||
95732b49 JA |
1422 | /* XXX could use js.j_firstj here */ |
1423 | for (i = 0; i < js.j_jobslots; i++) | |
726f6388 | 1424 | { |
ccc6cda3 | 1425 | if (jobs[i] && STOPPED (i)) |
726f6388 JA |
1426 | { |
1427 | killpg (jobs[i]->pgrp, SIGTERM); | |
1428 | killpg (jobs[i]->pgrp, SIGCONT); | |
1429 | } | |
1430 | } | |
1431 | } | |
1432 | ||
ccc6cda3 JA |
1433 | /* Cause all jobs, running or stopped, to receive a hangup signal. If |
1434 | a job is marked J_NOHUP, don't send the SIGHUP. */ | |
726f6388 JA |
1435 | void |
1436 | hangup_all_jobs () | |
1437 | { | |
1438 | register int i; | |
1439 | ||
95732b49 JA |
1440 | /* XXX could use js.j_firstj here */ |
1441 | for (i = 0; i < js.j_jobslots; i++) | |
726f6388 JA |
1442 | { |
1443 | if (jobs[i]) | |
1444 | { | |
0628567a JA |
1445 | if (jobs[i]->flags & J_NOHUP) |
1446 | continue; | |
1447 | killpg (jobs[i]->pgrp, SIGHUP); | |
ccc6cda3 | 1448 | if (STOPPED (i)) |
726f6388 JA |
1449 | killpg (jobs[i]->pgrp, SIGCONT); |
1450 | } | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | void | |
1455 | kill_current_pipeline () | |
1456 | { | |
1457 | stop_making_children (); | |
1458 | start_pipeline (); | |
1459 | } | |
1460 | ||
1461 | /* Return the pipeline that PID belongs to. Note that the pipeline | |
95732b49 JA |
1462 | doesn't have to belong to a job. Must be called with SIGCHLD blocked. |
1463 | If JOBP is non-null, return the index of the job containing PID. */ | |
726f6388 | 1464 | static PROCESS * |
95732b49 | 1465 | find_pipeline (pid, alive_only, jobp) |
726f6388 | 1466 | pid_t pid; |
95732b49 | 1467 | int alive_only; |
7117c2d2 | 1468 | int *jobp; /* index into jobs list or NO_JOB */ |
726f6388 JA |
1469 | { |
1470 | int job; | |
95732b49 | 1471 | PROCESS *p; |
726f6388 JA |
1472 | |
1473 | /* See if this process is in the pipeline that we are building. */ | |
7117c2d2 JA |
1474 | if (jobp) |
1475 | *jobp = NO_JOB; | |
726f6388 JA |
1476 | if (the_pipeline) |
1477 | { | |
ccc6cda3 | 1478 | p = the_pipeline; |
726f6388 JA |
1479 | do |
1480 | { | |
95732b49 JA |
1481 | /* Return it if we found it. Don't ever return a recycled pid. */ |
1482 | if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p))) | |
1483 | return (p); | |
726f6388 JA |
1484 | |
1485 | p = p->next; | |
1486 | } | |
1487 | while (p != the_pipeline); | |
1488 | } | |
a0c0a00f CR |
1489 | /* Now look in the last process substitution pipeline, since that sets $! */ |
1490 | if (last_procsub_child) | |
1491 | { | |
1492 | p = last_procsub_child; | |
1493 | do | |
1494 | { | |
1495 | /* Return it if we found it. Don't ever return a recycled pid. */ | |
1496 | if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p))) | |
1497 | return (p); | |
1498 | ||
1499 | p = p->next; | |
1500 | } | |
1501 | while (p != last_procsub_child); | |
1502 | } | |
726f6388 | 1503 | |
95732b49 | 1504 | job = find_job (pid, alive_only, &p); |
7117c2d2 JA |
1505 | if (jobp) |
1506 | *jobp = job; | |
ccc6cda3 | 1507 | return (job == NO_JOB) ? (PROCESS *)NULL : jobs[job]->pipe; |
726f6388 JA |
1508 | } |
1509 | ||
95732b49 JA |
1510 | /* Return the PROCESS * describing PID. If JOBP is non-null return the index |
1511 | into the jobs array of the job containing PID. Must be called with | |
1512 | SIGCHLD blocked. */ | |
1513 | static PROCESS * | |
1514 | find_process (pid, alive_only, jobp) | |
1515 | pid_t pid; | |
1516 | int alive_only; | |
1517 | int *jobp; /* index into jobs list or NO_JOB */ | |
1518 | { | |
1519 | PROCESS *p; | |
1520 | ||
1521 | p = find_pipeline (pid, alive_only, jobp); | |
1522 | while (p && p->pid != pid) | |
1523 | p = p->next; | |
1524 | return p; | |
1525 | } | |
1526 | ||
726f6388 JA |
1527 | /* Return the job index that PID belongs to, or NO_JOB if it doesn't |
1528 | belong to any job. Must be called with SIGCHLD blocked. */ | |
1529 | static int | |
95732b49 | 1530 | find_job (pid, alive_only, procp) |
726f6388 | 1531 | pid_t pid; |
95732b49 JA |
1532 | int alive_only; |
1533 | PROCESS **procp; | |
726f6388 JA |
1534 | { |
1535 | register int i; | |
95732b49 | 1536 | PROCESS *p; |
726f6388 | 1537 | |
0628567a | 1538 | /* XXX could use js.j_firstj here, and should check js.j_lastj */ |
95732b49 | 1539 | for (i = 0; i < js.j_jobslots; i++) |
726f6388 | 1540 | { |
95732b49 JA |
1541 | #if defined (DEBUG) |
1542 | if (i < js.j_firstj && jobs[i]) | |
1543 | itrace("find_job: job %d non-null before js.j_firstj (%d)", i, js.j_firstj); | |
0628567a JA |
1544 | if (i > js.j_lastj && jobs[i]) |
1545 | itrace("find_job: job %d non-null after js.j_lastj (%d)", i, js.j_lastj); | |
95732b49 | 1546 | #endif |
726f6388 JA |
1547 | if (jobs[i]) |
1548 | { | |
1549 | p = jobs[i]->pipe; | |
1550 | ||
1551 | do | |
1552 | { | |
95732b49 | 1553 | if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p))) |
7117c2d2 | 1554 | { |
95732b49 JA |
1555 | if (procp) |
1556 | *procp = p; | |
1557 | return (i); | |
7117c2d2 | 1558 | } |
726f6388 JA |
1559 | |
1560 | p = p->next; | |
1561 | } | |
1562 | while (p != jobs[i]->pipe); | |
1563 | } | |
1564 | } | |
1565 | ||
1566 | return (NO_JOB); | |
1567 | } | |
1568 | ||
d166f048 JA |
1569 | /* Find a job given a PID. If BLOCK is non-zero, block SIGCHLD as |
1570 | required by find_job. */ | |
1571 | int | |
1572 | get_job_by_pid (pid, block) | |
1573 | pid_t pid; | |
1574 | int block; | |
1575 | { | |
1576 | int job; | |
1577 | sigset_t set, oset; | |
1578 | ||
1579 | if (block) | |
1580 | BLOCK_CHILD (set, oset); | |
7117c2d2 | 1581 | |
95732b49 | 1582 | job = find_job (pid, 0, NULL); |
7117c2d2 | 1583 | |
d166f048 JA |
1584 | if (block) |
1585 | UNBLOCK_CHILD (oset); | |
1586 | ||
1587 | return job; | |
1588 | } | |
1589 | ||
726f6388 JA |
1590 | /* Print descriptive information about the job with leader pid PID. */ |
1591 | void | |
1592 | describe_pid (pid) | |
1593 | pid_t pid; | |
1594 | { | |
1595 | int job; | |
1596 | sigset_t set, oset; | |
1597 | ||
1598 | BLOCK_CHILD (set, oset); | |
1599 | ||
95732b49 | 1600 | job = find_job (pid, 0, NULL); |
726f6388 JA |
1601 | |
1602 | if (job != NO_JOB) | |
95732b49 | 1603 | fprintf (stderr, "[%d] %ld\n", job + 1, (long)pid); |
726f6388 | 1604 | else |
b80f6443 | 1605 | programming_error (_("describe_pid: %ld: no such pid"), (long)pid); |
726f6388 JA |
1606 | |
1607 | UNBLOCK_CHILD (oset); | |
1608 | } | |
1609 | ||
b80f6443 JA |
1610 | static char * |
1611 | j_strsignal (s) | |
1612 | int s; | |
1613 | { | |
1614 | char *x; | |
1615 | ||
1616 | x = strsignal (s); | |
1617 | if (x == 0) | |
1618 | { | |
1619 | x = retcode_name_buffer; | |
a0c0a00f | 1620 | snprintf (x, sizeof(retcode_name_buffer), _("Signal %d"), s); |
b80f6443 JA |
1621 | } |
1622 | return x; | |
1623 | } | |
1624 | ||
28ef6c31 JA |
1625 | static char * |
1626 | printable_job_status (j, p, format) | |
1627 | int j; | |
1628 | PROCESS *p; | |
1629 | int format; | |
1630 | { | |
1631 | static char *temp; | |
1632 | int es; | |
1633 | ||
3185942a | 1634 | temp = _("Done"); |
28ef6c31 JA |
1635 | |
1636 | if (STOPPED (j) && format == 0) | |
1637 | { | |
1638 | if (posixly_correct == 0 || p == 0 || (WIFSTOPPED (p->status) == 0)) | |
3185942a | 1639 | temp = _("Stopped"); |
28ef6c31 JA |
1640 | else |
1641 | { | |
1642 | temp = retcode_name_buffer; | |
a0c0a00f | 1643 | snprintf (temp, sizeof(retcode_name_buffer), _("Stopped(%s)"), signal_name (WSTOPSIG (p->status))); |
28ef6c31 JA |
1644 | } |
1645 | } | |
1646 | else if (RUNNING (j)) | |
3185942a | 1647 | temp = _("Running"); |
28ef6c31 JA |
1648 | else |
1649 | { | |
1650 | if (WIFSTOPPED (p->status)) | |
b80f6443 | 1651 | temp = j_strsignal (WSTOPSIG (p->status)); |
28ef6c31 | 1652 | else if (WIFSIGNALED (p->status)) |
b80f6443 | 1653 | temp = j_strsignal (WTERMSIG (p->status)); |
28ef6c31 JA |
1654 | else if (WIFEXITED (p->status)) |
1655 | { | |
1656 | temp = retcode_name_buffer; | |
1657 | es = WEXITSTATUS (p->status); | |
1658 | if (es == 0) | |
a0c0a00f CR |
1659 | { |
1660 | strncpy (temp, _("Done"), sizeof (retcode_name_buffer) - 1); | |
1661 | temp[sizeof (retcode_name_buffer) - 1] = '\0'; | |
1662 | } | |
28ef6c31 | 1663 | else if (posixly_correct) |
a0c0a00f | 1664 | snprintf (temp, sizeof(retcode_name_buffer), _("Done(%d)"), es); |
28ef6c31 | 1665 | else |
a0c0a00f | 1666 | snprintf (temp, sizeof(retcode_name_buffer), _("Exit %d"), es); |
28ef6c31 JA |
1667 | } |
1668 | else | |
3185942a | 1669 | temp = _("Unknown status"); |
28ef6c31 JA |
1670 | } |
1671 | ||
1672 | return temp; | |
1673 | } | |
1674 | ||
726f6388 JA |
1675 | /* This is the way to print out information on a job if you |
1676 | know the index. FORMAT is: | |
1677 | ||
1678 | JLIST_NORMAL) [1]+ Running emacs | |
1679 | JLIST_LONG ) [1]+ 2378 Running emacs | |
1680 | -1 ) [1]+ 2378 emacs | |
1681 | ||
1682 | JLIST_NORMAL) [1]+ Stopped ls | more | |
1683 | JLIST_LONG ) [1]+ 2369 Stopped ls | |
1684 | 2367 | more | |
1685 | JLIST_PID_ONLY) | |
1686 | Just list the pid of the process group leader (really | |
1687 | the process group). | |
1688 | JLIST_CHANGED_ONLY) | |
1689 | Use format JLIST_NORMAL, but list only jobs about which | |
1690 | the user has not been notified. */ | |
ccc6cda3 JA |
1691 | |
1692 | /* Print status for pipeline P. If JOB_INDEX is >= 0, it is the index into | |
1693 | the JOBS array corresponding to this pipeline. FORMAT is as described | |
1694 | above. Must be called with SIGCHLD blocked. | |
1695 | ||
1696 | If you're printing a pipeline that's not in the jobs array, like the | |
1697 | current pipeline as it's being created, pass -1 for JOB_INDEX */ | |
726f6388 | 1698 | static void |
ccc6cda3 JA |
1699 | print_pipeline (p, job_index, format, stream) |
1700 | PROCESS *p; | |
726f6388 JA |
1701 | int job_index, format; |
1702 | FILE *stream; | |
1703 | { | |
ccc6cda3 JA |
1704 | PROCESS *first, *last, *show; |
1705 | int es, name_padding; | |
28ef6c31 | 1706 | char *temp; |
726f6388 | 1707 | |
ccc6cda3 JA |
1708 | if (p == 0) |
1709 | return; | |
726f6388 | 1710 | |
ccc6cda3 | 1711 | first = last = p; |
726f6388 JA |
1712 | while (last->next != first) |
1713 | last = last->next; | |
1714 | ||
726f6388 JA |
1715 | for (;;) |
1716 | { | |
1717 | if (p != first) | |
1718 | fprintf (stream, format ? " " : " |"); | |
1719 | ||
ccc6cda3 | 1720 | if (format != JLIST_STANDARD) |
f73dda09 | 1721 | fprintf (stream, "%5ld", (long)p->pid); |
726f6388 JA |
1722 | |
1723 | fprintf (stream, " "); | |
1724 | ||
ccc6cda3 | 1725 | if (format > -1 && job_index >= 0) |
726f6388 | 1726 | { |
ccc6cda3 | 1727 | show = format ? p : last; |
28ef6c31 | 1728 | temp = printable_job_status (job_index, show, format); |
726f6388 JA |
1729 | |
1730 | if (p != first) | |
1731 | { | |
1732 | if (format) | |
1733 | { | |
1734 | if (show->running == first->running && | |
1735 | WSTATUS (show->status) == WSTATUS (first->status)) | |
1736 | temp = ""; | |
1737 | } | |
1738 | else | |
1739 | temp = (char *)NULL; | |
1740 | } | |
1741 | ||
1742 | if (temp) | |
1743 | { | |
726f6388 JA |
1744 | fprintf (stream, "%s", temp); |
1745 | ||
ccc6cda3 JA |
1746 | es = STRLEN (temp); |
1747 | if (es == 0) | |
28ef6c31 | 1748 | es = 2; /* strlen ("| ") */ |
ccc6cda3 | 1749 | name_padding = LONGEST_SIGNAL_DESC - es; |
726f6388 JA |
1750 | |
1751 | fprintf (stream, "%*s", name_padding, ""); | |
1752 | ||
f73dda09 JA |
1753 | if ((WIFSTOPPED (show->status) == 0) && |
1754 | (WIFCONTINUED (show->status) == 0) && | |
1755 | WIFCORED (show->status)) | |
3185942a | 1756 | fprintf (stream, _("(core dumped) ")); |
726f6388 JA |
1757 | } |
1758 | } | |
1759 | ||
1760 | if (p != first && format) | |
1761 | fprintf (stream, "| "); | |
1762 | ||
1763 | if (p->command) | |
1764 | fprintf (stream, "%s", p->command); | |
1765 | ||
ccc6cda3 | 1766 | if (p == last && job_index >= 0) |
726f6388 | 1767 | { |
ccc6cda3 | 1768 | temp = current_working_directory (); |
726f6388 | 1769 | |
ccc6cda3 | 1770 | if (RUNNING (job_index) && (IS_FOREGROUND (job_index) == 0)) |
726f6388 JA |
1771 | fprintf (stream, " &"); |
1772 | ||
ccc6cda3 | 1773 | if (strcmp (temp, jobs[job_index]->wd) != 0) |
726f6388 | 1774 | fprintf (stream, |
3185942a | 1775 | _(" (wd: %s)"), polite_directory_format (jobs[job_index]->wd)); |
726f6388 JA |
1776 | } |
1777 | ||
1778 | if (format || (p == last)) | |
cce855bc JA |
1779 | { |
1780 | /* We need to add a CR only if this is an interactive shell, and | |
1781 | we're reporting the status of a completed job asynchronously. | |
1782 | We can't really check whether this particular job is being | |
1783 | reported asynchronously, so just add the CR if the shell is | |
1784 | currently interactive and asynchronous notification is enabled. */ | |
1785 | if (asynchronous_notification && interactive) | |
1786 | fprintf (stream, "\r\n"); | |
1787 | else | |
1788 | fprintf (stream, "\n"); | |
1789 | } | |
726f6388 JA |
1790 | |
1791 | if (p == last) | |
1792 | break; | |
1793 | p = p->next; | |
1794 | } | |
726f6388 | 1795 | fflush (stream); |
ccc6cda3 JA |
1796 | } |
1797 | ||
7117c2d2 JA |
1798 | /* Print information to STREAM about jobs[JOB_INDEX] according to FORMAT. |
1799 | Must be called with SIGCHLD blocked or queued with queue_sigchld */ | |
ccc6cda3 JA |
1800 | static void |
1801 | pretty_print_job (job_index, format, stream) | |
1802 | int job_index, format; | |
1803 | FILE *stream; | |
1804 | { | |
1805 | register PROCESS *p; | |
ccc6cda3 JA |
1806 | |
1807 | /* Format only pid information about the process group leader? */ | |
1808 | if (format == JLIST_PID_ONLY) | |
1809 | { | |
f73dda09 | 1810 | fprintf (stream, "%ld\n", (long)jobs[job_index]->pipe->pid); |
ccc6cda3 JA |
1811 | return; |
1812 | } | |
1813 | ||
1814 | if (format == JLIST_CHANGED_ONLY) | |
1815 | { | |
1816 | if (IS_NOTIFIED (job_index)) | |
7117c2d2 | 1817 | return; |
ccc6cda3 JA |
1818 | format = JLIST_STANDARD; |
1819 | } | |
1820 | ||
1821 | if (format != JLIST_NONINTERACTIVE) | |
1822 | fprintf (stream, "[%d]%c ", job_index + 1, | |
95732b49 JA |
1823 | (job_index == js.j_current) ? '+': |
1824 | (job_index == js.j_previous) ? '-' : ' '); | |
ccc6cda3 JA |
1825 | |
1826 | if (format == JLIST_NONINTERACTIVE) | |
1827 | format = JLIST_LONG; | |
1828 | ||
1829 | p = jobs[job_index]->pipe; | |
1830 | ||
cce855bc JA |
1831 | print_pipeline (p, job_index, format, stream); |
1832 | ||
ccc6cda3 JA |
1833 | /* We have printed information about this job. When the job's |
1834 | status changes, waitchld () sets the notification flag to 0. */ | |
1835 | jobs[job_index]->flags |= J_NOTIFIED; | |
726f6388 JA |
1836 | } |
1837 | ||
ccc6cda3 JA |
1838 | static int |
1839 | print_job (job, format, state, job_index) | |
1840 | JOB *job; | |
1841 | int format, state, job_index; | |
1842 | { | |
1843 | if (state == -1 || (JOB_STATE)state == job->state) | |
1844 | pretty_print_job (job_index, format, stdout); | |
1845 | return (0); | |
1846 | } | |
1847 | ||
1848 | void | |
726f6388 JA |
1849 | list_one_job (job, format, ignore, job_index) |
1850 | JOB *job; | |
1851 | int format, ignore, job_index; | |
1852 | { | |
7117c2d2 | 1853 | pretty_print_job (job_index, format, stdout); |
ccc6cda3 JA |
1854 | } |
1855 | ||
1856 | void | |
1857 | list_stopped_jobs (format) | |
1858 | int format; | |
1859 | { | |
1860 | cleanup_dead_jobs (); | |
1861 | map_over_jobs (print_job, format, (int)JSTOPPED); | |
1862 | } | |
1863 | ||
1864 | void | |
1865 | list_running_jobs (format) | |
1866 | int format; | |
1867 | { | |
1868 | cleanup_dead_jobs (); | |
1869 | map_over_jobs (print_job, format, (int)JRUNNING); | |
726f6388 JA |
1870 | } |
1871 | ||
1872 | /* List jobs. If FORMAT is non-zero, then the long form of the information | |
1873 | is printed, else just a short version. */ | |
1874 | void | |
ccc6cda3 | 1875 | list_all_jobs (format) |
726f6388 JA |
1876 | int format; |
1877 | { | |
1878 | cleanup_dead_jobs (); | |
ccc6cda3 | 1879 | map_over_jobs (print_job, format, -1); |
726f6388 JA |
1880 | } |
1881 | ||
1882 | /* Fork, handling errors. Returns the pid of the newly made child, or 0. | |
1883 | COMMAND is just for remembering the name of the command; we don't do | |
1884 | anything else with it. ASYNC_P says what to do with the tty. If | |
1885 | non-zero, then don't give it away. */ | |
1886 | pid_t | |
1887 | make_child (command, async_p) | |
1888 | char *command; | |
1889 | int async_p; | |
1890 | { | |
3185942a | 1891 | int forksleep; |
726f6388 JA |
1892 | sigset_t set, oset; |
1893 | pid_t pid; | |
1894 | ||
ac50fbac CR |
1895 | /* XXX - block SIGTERM here and unblock in child after fork resets the |
1896 | set of pending signals? */ | |
726f6388 JA |
1897 | sigemptyset (&set); |
1898 | sigaddset (&set, SIGCHLD); | |
1899 | sigaddset (&set, SIGINT); | |
1900 | sigemptyset (&oset); | |
1901 | sigprocmask (SIG_BLOCK, &set, &oset); | |
1902 | ||
1903 | making_children (); | |
1904 | ||
3185942a JA |
1905 | forksleep = 1; |
1906 | ||
726f6388 JA |
1907 | #if defined (BUFFERED_INPUT) |
1908 | /* If default_buffered_input is active, we are reading a script. If | |
1909 | the command is asynchronous, we have already duplicated /dev/null | |
1910 | as fd 0, but have not changed the buffered stream corresponding to | |
1911 | the old fd 0. We don't want to sync the stream in this case. */ | |
1912 | if (default_buffered_input != -1 && | |
1913 | (!async_p || default_buffered_input > 0)) | |
1914 | sync_buffered_stream (default_buffered_input); | |
1915 | #endif /* BUFFERED_INPUT */ | |
1916 | ||
ac50fbac CR |
1917 | RESET_SIGTERM; |
1918 | ||
3185942a JA |
1919 | /* Create the child, handle severe errors. Retry on EAGAIN. */ |
1920 | while ((pid = fork ()) < 0 && errno == EAGAIN && forksleep < FORKSLEEP_MAX) | |
1921 | { | |
495aee44 | 1922 | /* bash-4.2 */ |
a0c0a00f | 1923 | sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); |
0001803f CR |
1924 | /* If we can't create any children, try to reap some dead ones. */ |
1925 | waitchld (-1, 0); | |
495aee44 | 1926 | |
a0c0a00f | 1927 | errno = EAGAIN; /* restore errno */ |
3185942a | 1928 | sys_error ("fork: retry"); |
ac50fbac CR |
1929 | RESET_SIGTERM; |
1930 | ||
3185942a JA |
1931 | if (sleep (forksleep) != 0) |
1932 | break; | |
1933 | forksleep <<= 1; | |
a0c0a00f CR |
1934 | |
1935 | if (interrupt_state) | |
1936 | break; | |
1937 | sigprocmask (SIG_SETMASK, &set, (sigset_t *)NULL); | |
3185942a JA |
1938 | } |
1939 | ||
ac50fbac CR |
1940 | if (pid != 0) |
1941 | RESET_SIGTERM; | |
1942 | ||
3185942a | 1943 | if (pid < 0) |
726f6388 | 1944 | { |
ccc6cda3 | 1945 | sys_error ("fork"); |
726f6388 JA |
1946 | |
1947 | /* Kill all of the processes in the current pipeline. */ | |
1948 | terminate_current_pipeline (); | |
1949 | ||
1950 | /* Discard the current pipeline, if any. */ | |
1951 | if (the_pipeline) | |
1952 | kill_current_pipeline (); | |
1953 | ||
0001803f | 1954 | last_command_exit_value = EX_NOEXEC; |
726f6388 JA |
1955 | throw_to_top_level (); /* Reset signals, etc. */ |
1956 | } | |
1957 | ||
1958 | if (pid == 0) | |
1959 | { | |
1960 | /* In the child. Give this child the right process group, set the | |
1961 | signals to the default state for a new process. */ | |
b72432fd | 1962 | pid_t mypid; |
726f6388 | 1963 | |
b72432fd | 1964 | mypid = getpid (); |
726f6388 JA |
1965 | #if defined (BUFFERED_INPUT) |
1966 | /* Close default_buffered_input if it's > 0. We don't close it if it's | |
1967 | 0 because that's the file descriptor used when redirecting input, | |
1968 | and it's wrong to close the file in that case. */ | |
cce855bc | 1969 | unset_bash_input (0); |
726f6388 JA |
1970 | #endif /* BUFFERED_INPUT */ |
1971 | ||
a0c0a00f CR |
1972 | CLRINTERRUPT; /* XXX - children have their own interrupt state */ |
1973 | ||
726f6388 JA |
1974 | /* Restore top-level signal mask. */ |
1975 | sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL); | |
1976 | ||
1977 | if (job_control) | |
1978 | { | |
1979 | /* All processes in this pipeline belong in the same | |
1980 | process group. */ | |
1981 | ||
ccc6cda3 | 1982 | if (pipeline_pgrp == 0) /* This is the first child. */ |
b72432fd | 1983 | pipeline_pgrp = mypid; |
726f6388 JA |
1984 | |
1985 | /* Check for running command in backquotes. */ | |
1986 | if (pipeline_pgrp == shell_pgrp) | |
ccc6cda3 | 1987 | ignore_tty_job_signals (); |
726f6388 | 1988 | else |
ccc6cda3 | 1989 | default_tty_job_signals (); |
726f6388 JA |
1990 | |
1991 | /* Set the process group before trying to mess with the terminal's | |
1992 | process group. This is mandated by POSIX. */ | |
1993 | /* This is in accordance with the Posix 1003.1 standard, | |
1994 | section B.7.2.4, which says that trying to set the terminal | |
1995 | process group with tcsetpgrp() to an unused pgrp value (like | |
1996 | this would have for the first child) is an error. Section | |
1997 | B.4.3.3, p. 237 also covers this, in the context of job control | |
1998 | shells. */ | |
b72432fd | 1999 | if (setpgid (mypid, pipeline_pgrp) < 0) |
3185942a | 2000 | sys_error (_("child setpgid (%ld to %ld)"), (long)mypid, (long)pipeline_pgrp); |
b80f6443 JA |
2001 | |
2002 | /* By convention (and assumption above), if | |
2003 | pipeline_pgrp == shell_pgrp, we are making a child for | |
2004 | command substitution. | |
2005 | In this case, we don't want to give the terminal to the | |
2006 | shell's process group (we could be in the middle of a | |
2007 | pipeline, for example). */ | |
a0c0a00f | 2008 | if (async_p == 0 && pipeline_pgrp != shell_pgrp && ((subshell_environment&(SUBSHELL_ASYNC|SUBSHELL_PIPE)) == 0) && running_in_background == 0) |
b80f6443 | 2009 | give_terminal_to (pipeline_pgrp, 0); |
726f6388 JA |
2010 | |
2011 | #if defined (PGRP_PIPE) | |
b80f6443 JA |
2012 | if (pipeline_pgrp == mypid) |
2013 | pipe_read (pgrp_pipe); | |
726f6388 JA |
2014 | #endif |
2015 | } | |
2016 | else /* Without job control... */ | |
2017 | { | |
ccc6cda3 | 2018 | if (pipeline_pgrp == 0) |
726f6388 JA |
2019 | pipeline_pgrp = shell_pgrp; |
2020 | ||
2021 | /* If these signals are set to SIG_DFL, we encounter the curious | |
2022 | situation of an interactive ^Z to a running process *working* | |
2023 | and stopping the process, but being unable to do anything with | |
2024 | that process to change its state. On the other hand, if they | |
2025 | are set to SIG_IGN, jobs started from scripts do not stop when | |
2026 | the shell running the script gets a SIGTSTP and stops. */ | |
2027 | ||
ccc6cda3 | 2028 | default_tty_job_signals (); |
726f6388 JA |
2029 | } |
2030 | ||
2031 | #if defined (PGRP_PIPE) | |
2032 | /* Release the process group pipe, since our call to setpgid () | |
3185942a JA |
2033 | is done. The last call to sh_closepipe is done in stop_pipeline. */ |
2034 | sh_closepipe (pgrp_pipe); | |
726f6388 JA |
2035 | #endif /* PGRP_PIPE */ |
2036 | ||
3185942a JA |
2037 | #if 0 |
2038 | /* Don't set last_asynchronous_pid in the child */ | |
726f6388 | 2039 | if (async_p) |
3185942a JA |
2040 | last_asynchronous_pid = mypid; /* XXX */ |
2041 | else | |
2042 | #endif | |
95732b49 | 2043 | #if defined (RECYCLES_PIDS) |
3185942a | 2044 | if (last_asynchronous_pid == mypid) |
95732b49 JA |
2045 | /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */ |
2046 | last_asynchronous_pid = 1; | |
2047 | #endif | |
726f6388 JA |
2048 | } |
2049 | else | |
2050 | { | |
2051 | /* In the parent. Remember the pid of the child just created | |
2052 | as the proper pgrp if this is the first child. */ | |
2053 | ||
2054 | if (job_control) | |
2055 | { | |
ccc6cda3 | 2056 | if (pipeline_pgrp == 0) |
726f6388 JA |
2057 | { |
2058 | pipeline_pgrp = pid; | |
2059 | /* Don't twiddle terminal pgrps in the parent! This is the bug, | |
2060 | not the good thing of twiddling them in the child! */ | |
28ef6c31 | 2061 | /* give_terminal_to (pipeline_pgrp, 0); */ |
726f6388 JA |
2062 | } |
2063 | /* This is done on the recommendation of the Rationale section of | |
2064 | the POSIX 1003.1 standard, where it discusses job control and | |
2065 | shells. It is done to avoid possible race conditions. (Ref. | |
2066 | 1003.1 Rationale, section B.4.3.3, page 236). */ | |
2067 | setpgid (pid, pipeline_pgrp); | |
2068 | } | |
2069 | else | |
2070 | { | |
ccc6cda3 | 2071 | if (pipeline_pgrp == 0) |
726f6388 JA |
2072 | pipeline_pgrp = shell_pgrp; |
2073 | } | |
2074 | ||
2075 | /* Place all processes into the jobs array regardless of the | |
2076 | state of job_control. */ | |
2077 | add_process (command, pid); | |
2078 | ||
2079 | if (async_p) | |
2080 | last_asynchronous_pid = pid; | |
95732b49 JA |
2081 | #if defined (RECYCLES_PIDS) |
2082 | else if (last_asynchronous_pid == pid) | |
2083 | /* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */ | |
2084 | last_asynchronous_pid = 1; | |
2085 | #endif | |
2086 | ||
ac50fbac CR |
2087 | /* Delete the saved status for any job containing this PID in case it's |
2088 | been reused. */ | |
2089 | delete_old_job (pid); | |
0628567a | 2090 | |
ac50fbac CR |
2091 | /* Perform the check for pid reuse unconditionally. Some systems reuse |
2092 | PIDs before giving a process CHILD_MAX/_SC_CHILD_MAX unique ones. */ | |
2093 | bgp_delete (pid); /* new process, discard any saved status */ | |
726f6388 JA |
2094 | |
2095 | last_made_pid = pid; | |
2096 | ||
95732b49 JA |
2097 | /* keep stats */ |
2098 | js.c_totforked++; | |
2099 | js.c_living++; | |
2100 | ||
2101 | /* Unblock SIGINT and SIGCHLD unless creating a pipeline, in which case | |
2102 | SIGCHLD remains blocked until all commands in the pipeline have been | |
2103 | created. */ | |
726f6388 JA |
2104 | sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); |
2105 | } | |
2106 | ||
2107 | return (pid); | |
2108 | } | |
2109 | ||
7117c2d2 | 2110 | /* These two functions are called only in child processes. */ |
ccc6cda3 JA |
2111 | void |
2112 | ignore_tty_job_signals () | |
2113 | { | |
2114 | set_signal_handler (SIGTSTP, SIG_IGN); | |
2115 | set_signal_handler (SIGTTIN, SIG_IGN); | |
2116 | set_signal_handler (SIGTTOU, SIG_IGN); | |
2117 | } | |
2118 | ||
a0c0a00f CR |
2119 | /* Reset the tty-generated job control signals to SIG_DFL unless that signal |
2120 | was ignored at entry to the shell, in which case we need to set it to | |
2121 | SIG_IGN in the child. We can't rely on resetting traps, since the hard | |
2122 | ignored signals can't be trapped. */ | |
ccc6cda3 JA |
2123 | void |
2124 | default_tty_job_signals () | |
2125 | { | |
a0c0a00f CR |
2126 | if (signal_is_trapped (SIGTSTP) == 0 && signal_is_hard_ignored (SIGTSTP)) |
2127 | set_signal_handler (SIGTSTP, SIG_IGN); | |
2128 | else | |
2129 | set_signal_handler (SIGTSTP, SIG_DFL); | |
2130 | ||
2131 | if (signal_is_trapped (SIGTTIN) == 0 && signal_is_hard_ignored (SIGTTIN)) | |
2132 | set_signal_handler (SIGTTIN, SIG_IGN); | |
2133 | else | |
2134 | set_signal_handler (SIGTTIN, SIG_DFL); | |
2135 | ||
2136 | if (signal_is_trapped (SIGTTOU) == 0 && signal_is_hard_ignored (SIGTTOU)) | |
2137 | set_signal_handler (SIGTTOU, SIG_IGN); | |
2138 | else | |
2139 | set_signal_handler (SIGTTOU, SIG_DFL); | |
2140 | } | |
2141 | ||
2142 | /* Called once in a parent process. */ | |
2143 | void | |
2144 | get_original_tty_job_signals () | |
2145 | { | |
2146 | static int fetched = 0; | |
2147 | ||
2148 | if (fetched == 0) | |
2149 | { | |
2150 | if (interactive_shell) | |
2151 | { | |
2152 | set_original_signal (SIGTSTP, SIG_DFL); | |
2153 | set_original_signal (SIGTTIN, SIG_DFL); | |
2154 | set_original_signal (SIGTTOU, SIG_DFL); | |
2155 | } | |
2156 | else | |
2157 | { | |
2158 | get_original_signal (SIGTSTP); | |
2159 | get_original_signal (SIGTTIN); | |
2160 | get_original_signal (SIGTTOU); | |
2161 | } | |
2162 | fetched = 1; | |
2163 | } | |
ccc6cda3 JA |
2164 | } |
2165 | ||
726f6388 JA |
2166 | /* When we end a job abnormally, or if we stop a job, we set the tty to the |
2167 | state kept in here. When a job ends normally, we set the state in here | |
2168 | to the state of the tty. */ | |
2169 | ||
28ef6c31 JA |
2170 | static TTYSTRUCT shell_tty_info; |
2171 | ||
726f6388 | 2172 | #if defined (NEW_TTY_DRIVER) |
726f6388 JA |
2173 | static struct tchars shell_tchars; |
2174 | static struct ltchars shell_ltchars; | |
2175 | #endif /* NEW_TTY_DRIVER */ | |
2176 | ||
726f6388 JA |
2177 | #if defined (NEW_TTY_DRIVER) && defined (DRAIN_OUTPUT) |
2178 | /* Since the BSD tty driver does not allow us to change the tty modes | |
2179 | while simultaneously waiting for output to drain and preserving | |
2180 | typeahead, we have to drain the output ourselves before calling | |
2181 | ioctl. We cheat by finding the length of the output queue, and | |
2182 | using select to wait for an appropriate length of time. This is | |
2183 | a hack, and should be labeled as such (it's a hastily-adapted | |
2184 | mutation of a `usleep' implementation). It's only reason for | |
2185 | existing is the flaw in the BSD tty driver. */ | |
2186 | ||
2187 | static int ttspeeds[] = | |
2188 | { | |
2189 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, | |
2190 | 1800, 2400, 4800, 9600, 19200, 38400 | |
2191 | }; | |
2192 | ||
2193 | static void | |
2194 | draino (fd, ospeed) | |
2195 | int fd, ospeed; | |
2196 | { | |
2197 | register int delay = ttspeeds[ospeed]; | |
2198 | int n; | |
2199 | ||
2200 | if (!delay) | |
2201 | return; | |
2202 | ||
2203 | while ((ioctl (fd, TIOCOUTQ, &n) == 0) && n) | |
2204 | { | |
2205 | if (n > (delay / 100)) | |
2206 | { | |
2207 | struct timeval tv; | |
2208 | ||
2209 | n *= 10; /* 2 bits more for conservativeness. */ | |
2210 | tv.tv_sec = n / delay; | |
2211 | tv.tv_usec = ((n % delay) * 1000000) / delay; | |
2212 | select (fd, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv); | |
2213 | } | |
2214 | else | |
2215 | break; | |
2216 | } | |
2217 | } | |
2218 | #endif /* NEW_TTY_DRIVER && DRAIN_OUTPUT */ | |
2219 | ||
2220 | /* Return the fd from which we are actually getting input. */ | |
2221 | #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr) | |
2222 | ||
2223 | /* Fill the contents of shell_tty_info with the current tty info. */ | |
ccc6cda3 | 2224 | int |
726f6388 JA |
2225 | get_tty_state () |
2226 | { | |
ccc6cda3 | 2227 | int tty; |
726f6388 | 2228 | |
ccc6cda3 | 2229 | tty = input_tty (); |
726f6388 JA |
2230 | if (tty != -1) |
2231 | { | |
2232 | #if defined (NEW_TTY_DRIVER) | |
2233 | ioctl (tty, TIOCGETP, &shell_tty_info); | |
2234 | ioctl (tty, TIOCGETC, &shell_tchars); | |
2235 | ioctl (tty, TIOCGLTC, &shell_ltchars); | |
2236 | #endif /* NEW_TTY_DRIVER */ | |
2237 | ||
2238 | #if defined (TERMIO_TTY_DRIVER) | |
2239 | ioctl (tty, TCGETA, &shell_tty_info); | |
2240 | #endif /* TERMIO_TTY_DRIVER */ | |
2241 | ||
2242 | #if defined (TERMIOS_TTY_DRIVER) | |
2243 | if (tcgetattr (tty, &shell_tty_info) < 0) | |
2244 | { | |
2245 | #if 0 | |
2246 | /* Only print an error message if we're really interactive at | |
2247 | this time. */ | |
2248 | if (interactive) | |
3185942a | 2249 | sys_error ("[%ld: %d (%d)] tcgetattr", (long)getpid (), shell_level, tty); |
726f6388 JA |
2250 | #endif |
2251 | return -1; | |
2252 | } | |
2253 | #endif /* TERMIOS_TTY_DRIVER */ | |
ccc6cda3 | 2254 | if (check_window_size) |
95732b49 | 2255 | get_new_window_size (0, (int *)0, (int *)0); |
726f6388 JA |
2256 | } |
2257 | return 0; | |
2258 | } | |
2259 | ||
2260 | /* Make the current tty use the state in shell_tty_info. */ | |
ccc6cda3 | 2261 | int |
726f6388 JA |
2262 | set_tty_state () |
2263 | { | |
d166f048 | 2264 | int tty; |
726f6388 | 2265 | |
d166f048 | 2266 | tty = input_tty (); |
726f6388 JA |
2267 | if (tty != -1) |
2268 | { | |
2269 | #if defined (NEW_TTY_DRIVER) | |
2270 | # if defined (DRAIN_OUTPUT) | |
2271 | draino (tty, shell_tty_info.sg_ospeed); | |
2272 | # endif /* DRAIN_OUTPUT */ | |
2273 | ioctl (tty, TIOCSETN, &shell_tty_info); | |
2274 | ioctl (tty, TIOCSETC, &shell_tchars); | |
2275 | ioctl (tty, TIOCSLTC, &shell_ltchars); | |
2276 | #endif /* NEW_TTY_DRIVER */ | |
2277 | ||
2278 | #if defined (TERMIO_TTY_DRIVER) | |
2279 | ioctl (tty, TCSETAW, &shell_tty_info); | |
2280 | #endif /* TERMIO_TTY_DRIVER */ | |
2281 | ||
2282 | #if defined (TERMIOS_TTY_DRIVER) | |
2283 | if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0) | |
2284 | { | |
2285 | /* Only print an error message if we're really interactive at | |
2286 | this time. */ | |
2287 | if (interactive) | |
3185942a | 2288 | sys_error ("[%ld: %d (%d)] tcsetattr", (long)getpid (), shell_level, tty); |
726f6388 JA |
2289 | return -1; |
2290 | } | |
2291 | #endif /* TERMIOS_TTY_DRIVER */ | |
2292 | } | |
2293 | return 0; | |
2294 | } | |
2295 | ||
95732b49 | 2296 | /* Given an index into the jobs array JOB, return the PROCESS struct of the last |
726f6388 | 2297 | process in that job's pipeline. This is the one whose exit status |
7117c2d2 | 2298 | counts. Must be called with SIGCHLD blocked or queued. */ |
95732b49 JA |
2299 | static PROCESS * |
2300 | find_last_proc (job, block) | |
726f6388 | 2301 | int job; |
7117c2d2 | 2302 | int block; |
726f6388 JA |
2303 | { |
2304 | register PROCESS *p; | |
7117c2d2 JA |
2305 | sigset_t set, oset; |
2306 | ||
2307 | if (block) | |
2308 | BLOCK_CHILD (set, oset); | |
726f6388 JA |
2309 | |
2310 | p = jobs[job]->pipe; | |
0628567a | 2311 | while (p && p->next != jobs[job]->pipe) |
726f6388 JA |
2312 | p = p->next; |
2313 | ||
7117c2d2 JA |
2314 | if (block) |
2315 | UNBLOCK_CHILD (oset); | |
cce855bc | 2316 | |
95732b49 | 2317 | return (p); |
cce855bc JA |
2318 | } |
2319 | ||
95732b49 JA |
2320 | static pid_t |
2321 | find_last_pid (job, block) | |
2322 | int job; | |
2323 | int block; | |
2324 | { | |
2325 | PROCESS *p; | |
2326 | ||
2327 | p = find_last_proc (job, block); | |
2328 | /* Possible race condition here. */ | |
2329 | return p->pid; | |
2330 | } | |
2331 | ||
726f6388 JA |
2332 | /* Wait for a particular child of the shell to finish executing. |
2333 | This low-level function prints an error message if PID is not | |
7117c2d2 JA |
2334 | a child of this shell. It returns -1 if it fails, or whatever |
2335 | wait_for returns otherwise. If the child is not found in the | |
a0c0a00f CR |
2336 | jobs table, it returns 127. If FLAGS doesn't include 1, we |
2337 | suppress the error message if PID isn't found. */ | |
2338 | ||
726f6388 | 2339 | int |
a0c0a00f | 2340 | wait_for_single_pid (pid, flags) |
726f6388 | 2341 | pid_t pid; |
a0c0a00f | 2342 | int flags; |
726f6388 JA |
2343 | { |
2344 | register PROCESS *child; | |
ccc6cda3 | 2345 | sigset_t set, oset; |
cce855bc | 2346 | int r, job; |
726f6388 | 2347 | |
ccc6cda3 | 2348 | BLOCK_CHILD (set, oset); |
7117c2d2 | 2349 | child = find_pipeline (pid, 0, (int *)NULL); |
ccc6cda3 | 2350 | UNBLOCK_CHILD (oset); |
726f6388 | 2351 | |
95732b49 JA |
2352 | if (child == 0) |
2353 | { | |
2354 | r = bgp_search (pid); | |
2355 | if (r >= 0) | |
2356 | return r; | |
2357 | } | |
2358 | ||
ccc6cda3 | 2359 | if (child == 0) |
726f6388 | 2360 | { |
a0c0a00f CR |
2361 | if (flags & 1) |
2362 | internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid); | |
726f6388 JA |
2363 | return (127); |
2364 | } | |
2365 | ||
cce855bc JA |
2366 | r = wait_for (pid); |
2367 | ||
b72432fd JA |
2368 | /* POSIX.2: if we just waited for a job, we can remove it from the jobs |
2369 | table. */ | |
2370 | BLOCK_CHILD (set, oset); | |
95732b49 | 2371 | job = find_job (pid, 0, NULL); |
b72432fd JA |
2372 | if (job != NO_JOB && jobs[job] && DEADJOB (job)) |
2373 | jobs[job]->flags |= J_NOTIFIED; | |
2374 | UNBLOCK_CHILD (oset); | |
cce855bc | 2375 | |
95732b49 JA |
2376 | /* If running in posix mode, remove the job from the jobs table immediately */ |
2377 | if (posixly_correct) | |
2378 | { | |
2379 | cleanup_dead_jobs (); | |
2380 | bgp_delete (pid); | |
2381 | } | |
2382 | ||
cce855bc | 2383 | return r; |
726f6388 JA |
2384 | } |
2385 | ||
495aee44 | 2386 | /* Wait for all of the background processes started by this shell to finish. */ |
726f6388 JA |
2387 | void |
2388 | wait_for_background_pids () | |
2389 | { | |
7117c2d2 | 2390 | register int i, r, waited_for; |
ccc6cda3 JA |
2391 | sigset_t set, oset; |
2392 | pid_t pid; | |
726f6388 | 2393 | |
bb70624e | 2394 | for (waited_for = 0;;) |
ccc6cda3 | 2395 | { |
726f6388 JA |
2396 | BLOCK_CHILD (set, oset); |
2397 | ||
7117c2d2 | 2398 | /* find first running job; if none running in foreground, break */ |
0628567a | 2399 | /* XXX could use js.j_firstj and js.j_lastj here */ |
95732b49 JA |
2400 | for (i = 0; i < js.j_jobslots; i++) |
2401 | { | |
2402 | #if defined (DEBUG) | |
2403 | if (i < js.j_firstj && jobs[i]) | |
2404 | itrace("wait_for_background_pids: job %d non-null before js.j_firstj (%d)", i, js.j_firstj); | |
0628567a JA |
2405 | if (i > js.j_lastj && jobs[i]) |
2406 | itrace("wait_for_background_pids: job %d non-null after js.j_lastj (%d)", i, js.j_lastj); | |
95732b49 JA |
2407 | #endif |
2408 | if (jobs[i] && RUNNING (i) && IS_FOREGROUND (i) == 0) | |
2409 | break; | |
2410 | } | |
2411 | if (i == js.j_jobslots) | |
726f6388 JA |
2412 | { |
2413 | UNBLOCK_CHILD (oset); | |
2414 | break; | |
2415 | } | |
2416 | ||
7117c2d2 JA |
2417 | /* now wait for the last pid in that job. */ |
2418 | pid = find_last_pid (i, 0); | |
2419 | UNBLOCK_CHILD (oset); | |
2420 | QUIT; | |
2421 | errno = 0; /* XXX */ | |
a0c0a00f | 2422 | r = wait_for_single_pid (pid, 1); |
7117c2d2 JA |
2423 | if (r == -1) |
2424 | { | |
2425 | /* If we're mistaken about job state, compensate. */ | |
2426 | if (errno == ECHILD) | |
2427 | mark_all_jobs_as_dead (); | |
2428 | } | |
2429 | else | |
2430 | waited_for++; | |
726f6388 | 2431 | } |
b72432fd JA |
2432 | |
2433 | /* POSIX.2 says the shell can discard the statuses of all completed jobs if | |
2434 | `wait' is called with no arguments. */ | |
2435 | mark_dead_jobs_as_notified (1); | |
2436 | cleanup_dead_jobs (); | |
95732b49 | 2437 | bgp_clear (); |
726f6388 JA |
2438 | } |
2439 | ||
2440 | /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */ | |
2441 | #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids | |
2442 | static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
2443 | ||
ac50fbac CR |
2444 | static int wait_sigint_received; |
2445 | static int child_caught_sigint; | |
2446 | static int waiting_for_child; | |
2447 | ||
a0c0a00f CR |
2448 | /* Clean up state after longjmp to wait_intr_buf */ |
2449 | void | |
2450 | wait_sigint_cleanup () | |
2451 | { | |
2452 | queue_sigchld = 0; | |
2453 | waiting_for_child = 0; | |
2454 | } | |
2455 | ||
726f6388 JA |
2456 | static void |
2457 | restore_sigint_handler () | |
2458 | { | |
2459 | if (old_sigint_handler != INVALID_SIGNAL_HANDLER) | |
2460 | { | |
2461 | set_signal_handler (SIGINT, old_sigint_handler); | |
2462 | old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
ac50fbac | 2463 | waiting_for_child = 0; |
726f6388 JA |
2464 | } |
2465 | } | |
2466 | ||
726f6388 JA |
2467 | /* Handle SIGINT while we are waiting for children in a script to exit. |
2468 | The `wait' builtin should be interruptible, but all others should be | |
2469 | effectively ignored (i.e. not cause the shell to exit). */ | |
2470 | static sighandler | |
2471 | wait_sigint_handler (sig) | |
2472 | int sig; | |
2473 | { | |
bb70624e JA |
2474 | SigHandler *sigint_handler; |
2475 | ||
726f6388 JA |
2476 | if (interrupt_immediately || |
2477 | (this_shell_builtin && this_shell_builtin == wait_builtin)) | |
2478 | { | |
ac50fbac | 2479 | last_command_exit_value = 128+SIGINT; |
726f6388 | 2480 | restore_sigint_handler (); |
bb70624e | 2481 | /* If we got a SIGINT while in `wait', and SIGINT is trapped, do |
28ef6c31 | 2482 | what POSIX.2 says (see builtins/wait.def for more info). */ |
bb70624e JA |
2483 | if (this_shell_builtin && this_shell_builtin == wait_builtin && |
2484 | signal_is_trapped (SIGINT) && | |
2485 | ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler)) | |
2486 | { | |
bb70624e | 2487 | trap_handler (SIGINT); /* set pending_traps[SIGINT] */ |
7117c2d2 | 2488 | wait_signal_received = SIGINT; |
a0c0a00f | 2489 | if (interrupt_immediately && wait_intr_flag) |
ac50fbac CR |
2490 | { |
2491 | interrupt_immediately = 0; | |
a0c0a00f | 2492 | sh_longjmp (wait_intr_buf, 1); |
ac50fbac CR |
2493 | } |
2494 | else | |
2495 | /* Let CHECK_WAIT_INTR handle it in wait_for/waitchld */ | |
2496 | SIGRETURN (0); | |
bb70624e | 2497 | } |
ac50fbac CR |
2498 | else if (interrupt_immediately) |
2499 | { | |
2500 | ADDINTERRUPT; | |
2501 | QUIT; | |
2502 | } | |
2503 | else /* wait_builtin but signal not trapped, treat as interrupt */ | |
2504 | kill (getpid (), SIGINT); | |
726f6388 JA |
2505 | } |
2506 | ||
ccc6cda3 JA |
2507 | /* XXX - should this be interrupt_state? If it is, the shell will act |
2508 | as if it got the SIGINT interrupt. */ | |
ac50fbac CR |
2509 | if (waiting_for_child) |
2510 | wait_sigint_received = 1; | |
2511 | else | |
2512 | { | |
2513 | last_command_exit_value = 128+SIGINT; | |
2514 | restore_sigint_handler (); | |
2515 | kill (getpid (), SIGINT); | |
2516 | } | |
ccc6cda3 | 2517 | |
726f6388 JA |
2518 | /* Otherwise effectively ignore the SIGINT and allow the running job to |
2519 | be killed. */ | |
ccc6cda3 | 2520 | SIGRETURN (0); |
726f6388 JA |
2521 | } |
2522 | ||
b80f6443 JA |
2523 | static int |
2524 | process_exit_signal (status) | |
2525 | WAIT status; | |
2526 | { | |
2527 | return (WIFSIGNALED (status) ? WTERMSIG (status) : 0); | |
2528 | } | |
2529 | ||
726f6388 JA |
2530 | static int |
2531 | process_exit_status (status) | |
2532 | WAIT status; | |
2533 | { | |
2534 | if (WIFSIGNALED (status)) | |
2535 | return (128 + WTERMSIG (status)); | |
ccc6cda3 | 2536 | else if (WIFSTOPPED (status) == 0) |
726f6388 JA |
2537 | return (WEXITSTATUS (status)); |
2538 | else | |
2539 | return (EXECUTION_SUCCESS); | |
2540 | } | |
2541 | ||
f1be666c JA |
2542 | static WAIT |
2543 | job_signal_status (job) | |
2544 | int job; | |
2545 | { | |
2546 | register PROCESS *p; | |
2547 | WAIT s; | |
2548 | ||
2549 | p = jobs[job]->pipe; | |
2550 | do | |
2551 | { | |
2552 | s = p->status; | |
2553 | if (WIFSIGNALED(s) || WIFSTOPPED(s)) | |
2554 | break; | |
2555 | p = p->next; | |
2556 | } | |
2557 | while (p != jobs[job]->pipe); | |
2558 | ||
2559 | return s; | |
2560 | } | |
2561 | ||
28ef6c31 JA |
2562 | /* Return the exit status of the last process in the pipeline for job JOB. |
2563 | This is the exit status of the entire job. */ | |
2564 | static WAIT | |
bb70624e | 2565 | raw_job_exit_status (job) |
f73dda09 | 2566 | int job; |
ccc6cda3 JA |
2567 | { |
2568 | register PROCESS *p; | |
b80f6443 | 2569 | int fail; |
3185942a | 2570 | WAIT ret; |
b80f6443 JA |
2571 | |
2572 | if (pipefail_opt) | |
2573 | { | |
2574 | fail = 0; | |
eb873671 JA |
2575 | p = jobs[job]->pipe; |
2576 | do | |
2577 | { | |
3185942a JA |
2578 | if (WSTATUS (p->status) != EXECUTION_SUCCESS) |
2579 | fail = WSTATUS(p->status); | |
eb873671 JA |
2580 | p = p->next; |
2581 | } | |
2582 | while (p != jobs[job]->pipe); | |
3185942a JA |
2583 | WSTATUS (ret) = fail; |
2584 | return ret; | |
b80f6443 JA |
2585 | } |
2586 | ||
ccc6cda3 JA |
2587 | for (p = jobs[job]->pipe; p->next != jobs[job]->pipe; p = p->next) |
2588 | ; | |
bb70624e JA |
2589 | return (p->status); |
2590 | } | |
2591 | ||
28ef6c31 JA |
2592 | /* Return the exit status of job JOB. This is the exit status of the last |
2593 | (rightmost) process in the job's pipeline, modified if the job was killed | |
2594 | by a signal or stopped. */ | |
495aee44 | 2595 | int |
bb70624e JA |
2596 | job_exit_status (job) |
2597 | int job; | |
2598 | { | |
2599 | return (process_exit_status (raw_job_exit_status (job))); | |
ccc6cda3 JA |
2600 | } |
2601 | ||
495aee44 | 2602 | int |
b80f6443 JA |
2603 | job_exit_signal (job) |
2604 | int job; | |
2605 | { | |
2606 | return (process_exit_signal (raw_job_exit_status (job))); | |
2607 | } | |
2608 | ||
ccc6cda3 JA |
2609 | #define FIND_CHILD(pid, child) \ |
2610 | do \ | |
2611 | { \ | |
7117c2d2 | 2612 | child = find_pipeline (pid, 0, (int *)NULL); \ |
ccc6cda3 JA |
2613 | if (child == 0) \ |
2614 | { \ | |
28ef6c31 | 2615 | give_terminal_to (shell_pgrp, 0); \ |
ccc6cda3 | 2616 | UNBLOCK_CHILD (oset); \ |
b80f6443 | 2617 | internal_error (_("wait_for: No record of process %ld"), (long)pid); \ |
ccc6cda3 JA |
2618 | restore_sigint_handler (); \ |
2619 | return (termination_state = 127); \ | |
2620 | } \ | |
2621 | } \ | |
2622 | while (0) | |
2623 | ||
bb70624e JA |
2624 | /* Wait for pid (one of our children) to terminate, then |
2625 | return the termination state. Returns 127 if PID is not found in | |
2626 | the jobs table. Returns -1 if waitchld() returns -1, indicating | |
2627 | that there are no unwaited-for child processes. */ | |
726f6388 JA |
2628 | int |
2629 | wait_for (pid) | |
2630 | pid_t pid; | |
2631 | { | |
28ef6c31 JA |
2632 | int job, termination_state, r; |
2633 | WAIT s; | |
726f6388 JA |
2634 | register PROCESS *child; |
2635 | sigset_t set, oset; | |
2636 | ||
2637 | /* In the case that this code is interrupted, and we longjmp () out of it, | |
2638 | we are relying on the code in throw_to_top_level () to restore the | |
2639 | top-level signal mask. */ | |
ac50fbac | 2640 | child = 0; |
726f6388 JA |
2641 | BLOCK_CHILD (set, oset); |
2642 | ||
2643 | /* Ignore interrupts while waiting for a job run without job control | |
2644 | to finish. We don't want the shell to exit if an interrupt is | |
2645 | received, only if one of the jobs run is killed via SIGINT. If | |
ccc6cda3 | 2646 | job control is not set, the job will be run in the same pgrp as |
f1be666c JA |
2647 | the shell, and the shell will see any signals the job gets. In |
2648 | fact, we want this set every time the waiting shell and the waited- | |
2649 | for process are in the same process group, including command | |
2650 | substitution. */ | |
726f6388 JA |
2651 | |
2652 | /* This is possibly a race condition -- should it go in stop_pipeline? */ | |
ac50fbac | 2653 | wait_sigint_received = child_caught_sigint = 0; |
f1be666c | 2654 | if (job_control == 0 || (subshell_environment&SUBSHELL_COMSUB)) |
0628567a JA |
2655 | { |
2656 | old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler); | |
ac50fbac | 2657 | waiting_for_child = 0; |
0628567a JA |
2658 | if (old_sigint_handler == SIG_IGN) |
2659 | set_signal_handler (SIGINT, old_sigint_handler); | |
2660 | } | |
726f6388 JA |
2661 | |
2662 | termination_state = last_command_exit_value; | |
2663 | ||
ccc6cda3 | 2664 | if (interactive && job_control == 0) |
726f6388 | 2665 | QUIT; |
0001803f CR |
2666 | /* Check for terminating signals and exit the shell if we receive one */ |
2667 | CHECK_TERMSIG; | |
726f6388 | 2668 | |
ac50fbac CR |
2669 | /* Check for a trapped signal interrupting the wait builtin and jump out */ |
2670 | CHECK_WAIT_INTR; | |
2671 | ||
ccc6cda3 JA |
2672 | /* If we say wait_for (), then we have a record of this child somewhere. |
2673 | If it and none of its peers are running, don't call waitchld(). */ | |
726f6388 | 2674 | |
ccc6cda3 JA |
2675 | job = NO_JOB; |
2676 | do | |
726f6388 | 2677 | { |
ac50fbac CR |
2678 | if (pid != ANY_PID) |
2679 | FIND_CHILD (pid, child); | |
726f6388 | 2680 | |
ccc6cda3 | 2681 | /* If this child is part of a job, then we are really waiting for the |
28ef6c31 JA |
2682 | job to finish. Otherwise, we are waiting for the child to finish. |
2683 | We check for JDEAD in case the job state has been set by waitchld | |
2684 | after receipt of a SIGCHLD. */ | |
a0c0a00f | 2685 | if (job == NO_JOB) /* XXX -- && pid != ANY_PID ? */ |
95732b49 | 2686 | job = find_job (pid, 0, NULL); |
726f6388 | 2687 | |
28ef6c31 JA |
2688 | /* waitchld() takes care of setting the state of the job. If the job |
2689 | has already exited before this is called, sigchld_handler will have | |
2690 | called waitchld and the state will be set to JDEAD. */ | |
726f6388 | 2691 | |
ac50fbac | 2692 | if (pid == ANY_PID || PRUNNING(child) || (job != NO_JOB && RUNNING (job))) |
ccc6cda3 JA |
2693 | { |
2694 | #if defined (WAITPID_BROKEN) /* SCOv4 */ | |
2695 | sigset_t suspend_set; | |
2696 | sigemptyset (&suspend_set); | |
2697 | sigsuspend (&suspend_set); | |
726f6388 | 2698 | #else /* !WAITPID_BROKEN */ |
ccc6cda3 JA |
2699 | # if defined (MUST_UNBLOCK_CHLD) |
2700 | struct sigaction act, oact; | |
2701 | sigset_t nullset, chldset; | |
2702 | ||
a0c0a00f | 2703 | queue_sigchld = 1; |
ccc6cda3 JA |
2704 | sigemptyset (&nullset); |
2705 | sigemptyset (&chldset); | |
2706 | sigprocmask (SIG_SETMASK, &nullset, &chldset); | |
2707 | act.sa_handler = SIG_DFL; | |
2708 | sigemptyset (&act.sa_mask); | |
2709 | sigemptyset (&oact.sa_mask); | |
2710 | act.sa_flags = 0; | |
ac50fbac CR |
2711 | # if defined (SA_RESTART) |
2712 | act.sa_flags |= SA_RESTART; | |
726f6388 | 2713 | # endif |
ac50fbac CR |
2714 | sigaction (SIGCHLD, &act, &oact); |
2715 | # endif /* MUST_UNBLOCK_CHLD */ | |
7117c2d2 | 2716 | queue_sigchld = 1; |
ac50fbac CR |
2717 | waiting_for_child++; |
2718 | r = waitchld (pid, 1); /* XXX */ | |
2719 | waiting_for_child--; | |
2720 | #if 0 | |
2721 | itrace("wait_for: blocking wait for %d returns %d child = %p", (int)pid, r, child); | |
2722 | #endif | |
ccc6cda3 JA |
2723 | # if defined (MUST_UNBLOCK_CHLD) |
2724 | sigaction (SIGCHLD, &oact, (struct sigaction *)NULL); | |
2725 | sigprocmask (SIG_SETMASK, &chldset, (sigset_t *)NULL); | |
726f6388 | 2726 | # endif |
7117c2d2 | 2727 | queue_sigchld = 0; |
bb70624e JA |
2728 | if (r == -1 && errno == ECHILD && this_shell_builtin == wait_builtin) |
2729 | { | |
2730 | termination_state = -1; | |
ac50fbac | 2731 | /* XXX - restore sigint handler here? */ |
bb70624e JA |
2732 | goto wait_for_return; |
2733 | } | |
28ef6c31 JA |
2734 | |
2735 | /* If child is marked as running, but waitpid() returns -1/ECHILD, | |
2736 | there is something wrong. Somewhere, wait should have returned | |
2737 | that child's pid. Mark the child as not running and the job, | |
2738 | if it exists, as JDEAD. */ | |
2739 | if (r == -1 && errno == ECHILD) | |
2740 | { | |
ac50fbac CR |
2741 | if (child) |
2742 | { | |
2743 | child->running = PS_DONE; | |
2744 | WSTATUS (child->status) = 0; /* XXX -- can't find true status */ | |
2745 | } | |
0628567a | 2746 | js.c_living = 0; /* no living child processes */ |
28ef6c31 | 2747 | if (job != NO_JOB) |
95732b49 JA |
2748 | { |
2749 | jobs[job]->state = JDEAD; | |
2750 | js.c_reaped++; | |
2751 | js.j_ndead++; | |
2752 | } | |
ac50fbac CR |
2753 | if (pid == ANY_PID) |
2754 | { | |
2755 | termination_state = -1; | |
2756 | break; | |
2757 | } | |
28ef6c31 | 2758 | } |
ccc6cda3 JA |
2759 | #endif /* WAITPID_BROKEN */ |
2760 | } | |
2761 | ||
2762 | /* If the shell is interactive, and job control is disabled, see | |
2763 | if the foreground process has died due to SIGINT and jump out | |
2764 | of the wait loop if it has. waitchld has already restored the | |
2765 | old SIGINT signal handler. */ | |
2766 | if (interactive && job_control == 0) | |
2767 | QUIT; | |
0001803f CR |
2768 | /* Check for terminating signals and exit the shell if we receive one */ |
2769 | CHECK_TERMSIG; | |
ac50fbac CR |
2770 | |
2771 | /* Check for a trapped signal interrupting the wait builtin and jump out */ | |
2772 | CHECK_WAIT_INTR; | |
2773 | ||
2774 | if (pid == ANY_PID) | |
2775 | /* XXX - could set child but we don't have a handle on what waitchld | |
2776 | reaps. Leave termination_state alone. */ | |
2777 | goto wait_for_return; | |
726f6388 | 2778 | } |
95732b49 | 2779 | while (PRUNNING (child) || (job != NO_JOB && RUNNING (job))); |
726f6388 | 2780 | |
ac50fbac CR |
2781 | /* Restore the original SIGINT signal handler before we return. */ |
2782 | restore_sigint_handler (); | |
2783 | ||
726f6388 JA |
2784 | /* The exit state of the command is either the termination state of the |
2785 | child, or the termination state of the job. If a job, the status | |
b80f6443 JA |
2786 | of the last child in the pipeline is the significant one. If the command |
2787 | or job was terminated by a signal, note that value also. */ | |
2788 | termination_state = (job != NO_JOB) ? job_exit_status (job) | |
a0c0a00f | 2789 | : (child ? process_exit_status (child->status) : EXECUTION_SUCCESS); |
b80f6443 | 2790 | last_command_exit_signal = (job != NO_JOB) ? job_exit_signal (job) |
a0c0a00f | 2791 | : (child ? process_exit_signal (child->status) : 0); |
726f6388 | 2792 | |
95732b49 | 2793 | /* XXX */ |
a0c0a00f | 2794 | if ((job != NO_JOB && JOBSTATE (job) == JSTOPPED) || (child && WIFSTOPPED (child->status))) |
95732b49 JA |
2795 | termination_state = 128 + WSTOPSIG (child->status); |
2796 | ||
ccc6cda3 | 2797 | if (job == NO_JOB || IS_JOBCONTROL (job)) |
b72432fd JA |
2798 | { |
2799 | /* XXX - under what circumstances is a job not present in the jobs | |
2800 | table (job == NO_JOB)? | |
2801 | 1. command substitution | |
2802 | ||
2803 | In the case of command substitution, at least, it's probably not | |
2804 | the right thing to give the terminal to the shell's process group, | |
2805 | even though there is code in subst.c:command_substitute to work | |
2806 | around it. | |
2807 | ||
2808 | Things that don't: | |
2809 | $PROMPT_COMMAND execution | |
2810 | process substitution | |
2811 | */ | |
2812 | #if 0 | |
2813 | if (job == NO_JOB) | |
f73dda09 | 2814 | itrace("wait_for: job == NO_JOB, giving the terminal to shell_pgrp (%ld)", (long)shell_pgrp); |
b72432fd | 2815 | #endif |
a0c0a00f CR |
2816 | /* Don't modify terminal pgrp if we are running in background or a |
2817 | subshell. Make sure subst.c:command_substitute uses the same | |
2818 | conditions to determine whether or not it should undo this and | |
2819 | give the terminal to pipeline_pgrp. */ | |
2820 | ||
2821 | if (running_in_background == 0 && (subshell_environment&(SUBSHELL_ASYNC|SUBSHELL_PIPE)) == 0) | |
2822 | give_terminal_to (shell_pgrp, 0); | |
b72432fd | 2823 | } |
726f6388 JA |
2824 | |
2825 | /* If the command did not exit cleanly, or the job is just | |
2826 | being stopped, then reset the tty state back to what it | |
2827 | was before this command. Reset the tty state and notify | |
2828 | the user of the job termination only if the shell is | |
2829 | interactive. Clean up any dead jobs in either case. */ | |
2830 | if (job != NO_JOB) | |
2831 | { | |
ccc6cda3 | 2832 | if (interactive_shell && subshell_environment == 0) |
726f6388 | 2833 | { |
bb70624e JA |
2834 | /* This used to use `child->status'. That's wrong, however, for |
2835 | pipelines. `child' is the first process in the pipeline. It's | |
2836 | likely that the process we want to check for abnormal termination | |
2837 | or stopping is the last process in the pipeline, especially if | |
2838 | it's long-lived and the first process is short-lived. Since we | |
2839 | know we have a job here, we can check all the processes in this | |
2840 | job's pipeline and see if one of them stopped or terminated due | |
2841 | to a signal. We might want to change this later to just check | |
2842 | the last process in the pipeline. If no process exits due to a | |
2843 | signal, S is left as the status of the last job in the pipeline. */ | |
f1be666c | 2844 | s = job_signal_status (job); |
bb70624e JA |
2845 | |
2846 | if (WIFSIGNALED (s) || WIFSTOPPED (s)) | |
e8ce775d JA |
2847 | { |
2848 | set_tty_state (); | |
28ef6c31 | 2849 | |
bb70624e JA |
2850 | /* If the current job was stopped or killed by a signal, and |
2851 | the user has requested it, get a possibly new window size */ | |
95732b49 JA |
2852 | if (check_window_size && (job == js.j_current || IS_FOREGROUND (job))) |
2853 | get_new_window_size (0, (int *)0, (int *)0); | |
e8ce775d | 2854 | } |
726f6388 | 2855 | else |
a0c0a00f CR |
2856 | #if defined (READLINE) |
2857 | /* We don't want to do this if we are running a process during | |
2858 | programmable completion. */ | |
2859 | if (RL_ISSTATE (RL_STATE_COMPLETING) == 0) | |
2860 | #endif | |
726f6388 JA |
2861 | get_tty_state (); |
2862 | ||
2863 | /* If job control is enabled, the job was started with job | |
2864 | control, the job was the foreground job, and it was killed | |
2865 | by SIGINT, then print a newline to compensate for the kernel | |
2866 | printing the ^C without a trailing newline. */ | |
ccc6cda3 | 2867 | if (job_control && IS_JOBCONTROL (job) && IS_FOREGROUND (job) && |
bb70624e | 2868 | WIFSIGNALED (s) && WTERMSIG (s) == SIGINT) |
726f6388 | 2869 | { |
ccc6cda3 JA |
2870 | /* If SIGINT is not trapped and the shell is in a for, while, |
2871 | or until loop, act as if the shell received SIGINT as | |
2872 | well, so the loop can be broken. This doesn't call the | |
2873 | SIGINT signal handler; maybe it should. */ | |
3185942a | 2874 | if (signal_is_trapped (SIGINT) == 0 && (loop_level || (shell_compatibility_level > 32 && executing_list))) |
ccc6cda3 | 2875 | ADDINTERRUPT; |
a0c0a00f CR |
2876 | /* Call any SIGINT trap handler if the shell is running a loop, so |
2877 | the loop can be broken. This seems more useful and matches the | |
2878 | behavior when the shell is running a builtin command in a loop | |
2879 | when it is interrupted. Change ADDINTERRUPT to | |
2880 | trap_handler (SIGINT) to run the trap without interrupting the | |
2881 | loop. */ | |
2882 | else if (signal_is_trapped (SIGINT) && loop_level) | |
2883 | ADDINTERRUPT; | |
ccc6cda3 | 2884 | else |
726f6388 | 2885 | { |
ccc6cda3 JA |
2886 | putchar ('\n'); |
2887 | fflush (stdout); | |
726f6388 JA |
2888 | } |
2889 | } | |
726f6388 | 2890 | } |
495aee44 | 2891 | else if ((subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PIPE)) && wait_sigint_received) |
f1be666c JA |
2892 | { |
2893 | /* If waiting for a job in a subshell started to do command | |
495aee44 CR |
2894 | substitution or to run a pipeline element that consists of |
2895 | something like a while loop or a for loop, simulate getting | |
2896 | and being killed by the SIGINT to pass the status back to our | |
2897 | parent. */ | |
ac50fbac | 2898 | if (child_caught_sigint == 0 && signal_is_trapped (SIGINT) == 0) |
f1be666c JA |
2899 | { |
2900 | UNBLOCK_CHILD (oset); | |
f1be666c JA |
2901 | old_sigint_handler = set_signal_handler (SIGINT, SIG_DFL); |
2902 | if (old_sigint_handler == SIG_IGN) | |
2903 | restore_sigint_handler (); | |
2904 | else | |
2905 | kill (getpid (), SIGINT); | |
2906 | } | |
2907 | } | |
ac50fbac CR |
2908 | else if (interactive_shell == 0 && IS_FOREGROUND (job) && check_window_size) |
2909 | get_new_window_size (0, (int *)0, (int *)0); | |
28ef6c31 | 2910 | |
7117c2d2 JA |
2911 | /* Moved here from set_job_status_and_cleanup, which is in the SIGCHLD |
2912 | signal handler path */ | |
2913 | if (DEADJOB (job) && IS_FOREGROUND (job) /*&& subshell_environment == 0*/) | |
2914 | setjstatus (job); | |
2915 | ||
28ef6c31 JA |
2916 | /* If this job is dead, notify the user of the status. If the shell |
2917 | is interactive, this will display a message on the terminal. If | |
2918 | the shell is not interactive, make sure we turn on the notify bit | |
2919 | so we don't get an unwanted message about the job's termination, | |
2920 | and so delete_job really clears the slot in the jobs table. */ | |
2921 | notify_and_cleanup (); | |
726f6388 | 2922 | } |
ccc6cda3 | 2923 | |
bb70624e JA |
2924 | wait_for_return: |
2925 | ||
726f6388 JA |
2926 | UNBLOCK_CHILD (oset); |
2927 | ||
726f6388 JA |
2928 | return (termination_state); |
2929 | } | |
2930 | ||
bb70624e JA |
2931 | /* Wait for the last process in the pipeline for JOB. Returns whatever |
2932 | wait_for returns: the last process's termination state or -1 if there | |
2933 | are no unwaited-for child processes or an error occurs. */ | |
726f6388 JA |
2934 | int |
2935 | wait_for_job (job) | |
2936 | int job; | |
2937 | { | |
ccc6cda3 | 2938 | pid_t pid; |
cce855bc JA |
2939 | int r; |
2940 | sigset_t set, oset; | |
2941 | ||
2942 | BLOCK_CHILD(set, oset); | |
2943 | if (JOBSTATE (job) == JSTOPPED) | |
b80f6443 | 2944 | internal_warning (_("wait_for_job: job %d is stopped"), job+1); |
ccc6cda3 | 2945 | |
7117c2d2 JA |
2946 | pid = find_last_pid (job, 0); |
2947 | UNBLOCK_CHILD(oset); | |
cce855bc JA |
2948 | r = wait_for (pid); |
2949 | ||
b72432fd JA |
2950 | /* POSIX.2: we can remove the job from the jobs table if we just waited |
2951 | for it. */ | |
2952 | BLOCK_CHILD (set, oset); | |
2953 | if (job != NO_JOB && jobs[job] && DEADJOB (job)) | |
2954 | jobs[job]->flags |= J_NOTIFIED; | |
2955 | UNBLOCK_CHILD (oset); | |
cce855bc JA |
2956 | |
2957 | return r; | |
726f6388 JA |
2958 | } |
2959 | ||
ac50fbac CR |
2960 | /* Wait for any background job started by this shell to finish. Very |
2961 | similar to wait_for_background_pids(). Returns the exit status of | |
2962 | the next exiting job, -1 if there are no background jobs. The caller | |
2963 | is responsible for translating -1 into the right return value. */ | |
2964 | int | |
2965 | wait_for_any_job () | |
2966 | { | |
2967 | pid_t pid; | |
2968 | int i, r, waited_for; | |
2969 | sigset_t set, oset; | |
2970 | ||
2971 | if (jobs_list_frozen) | |
2972 | return -1; | |
2973 | ||
2974 | /* First see if there are any unnotified dead jobs that we can report on */ | |
2975 | BLOCK_CHILD (set, oset); | |
2976 | for (i = 0; i < js.j_jobslots; i++) | |
2977 | { | |
2978 | if (jobs[i] && DEADJOB (i) && IS_NOTIFIED (i) == 0) | |
2979 | { | |
2980 | return_job: | |
2981 | r = job_exit_status (i); | |
2982 | notify_of_job_status (); /* XXX */ | |
2983 | delete_job (i, 0); | |
2984 | #if defined (COPROCESS_SUPPORT) | |
2985 | coproc_reap (); | |
2986 | #endif | |
2987 | UNBLOCK_CHILD (oset); | |
2988 | return r; | |
2989 | } | |
2990 | } | |
2991 | UNBLOCK_CHILD (oset); | |
2992 | ||
2993 | /* At this point, we have no dead jobs in the jobs table. Wait until we | |
2994 | get one, even if it takes multiple pids exiting. */ | |
2995 | for (waited_for = 0;;) | |
2996 | { | |
2997 | /* Make sure there is a background job to wait for */ | |
2998 | BLOCK_CHILD (set, oset); | |
2999 | for (i = 0; i < js.j_jobslots; i++) | |
3000 | if (jobs[i] && RUNNING (i) && IS_FOREGROUND (i) == 0) | |
3001 | break; | |
3002 | if (i == js.j_jobslots) | |
3003 | { | |
3004 | UNBLOCK_CHILD (oset); | |
3005 | return -1; | |
3006 | } | |
3007 | ||
3008 | UNBLOCK_CHILD (oset); | |
3009 | ||
3010 | QUIT; | |
3011 | CHECK_TERMSIG; | |
3012 | CHECK_WAIT_INTR; | |
3013 | ||
3014 | errno = 0; | |
3015 | r = wait_for (ANY_PID); /* special sentinel value for wait_for */ | |
3016 | if (r == -1 && errno == ECHILD) | |
3017 | mark_all_jobs_as_dead (); | |
3018 | ||
3019 | /* Now we see if we have any dead jobs and return the first one */ | |
3020 | BLOCK_CHILD (set, oset); | |
3021 | for (i = 0; i < js.j_jobslots; i++) | |
3022 | if (jobs[i] && DEADJOB (i)) | |
3023 | goto return_job; | |
3024 | UNBLOCK_CHILD (oset); | |
3025 | } | |
3026 | ||
3027 | return -1; | |
3028 | } | |
3029 | ||
726f6388 JA |
3030 | /* Print info about dead jobs, and then delete them from the list |
3031 | of known jobs. This does not actually delete jobs when the | |
3032 | shell is not interactive, because the dead jobs are not marked | |
3033 | as notified. */ | |
3034 | void | |
3035 | notify_and_cleanup () | |
3036 | { | |
ccc6cda3 | 3037 | if (jobs_list_frozen) |
726f6388 JA |
3038 | return; |
3039 | ||
28ef6c31 | 3040 | if (interactive || interactive_shell == 0 || sourcelevel) |
726f6388 JA |
3041 | notify_of_job_status (); |
3042 | ||
3043 | cleanup_dead_jobs (); | |
3044 | } | |
3045 | ||
3046 | /* Make dead jobs disappear from the jobs array without notification. | |
3047 | This is used when the shell is not interactive. */ | |
3048 | void | |
3049 | reap_dead_jobs () | |
3050 | { | |
b72432fd | 3051 | mark_dead_jobs_as_notified (0); |
726f6388 JA |
3052 | cleanup_dead_jobs (); |
3053 | } | |
3054 | ||
3055 | /* Return the next closest (chronologically) job to JOB which is in | |
3056 | STATE. STATE can be JSTOPPED, JRUNNING. NO_JOB is returned if | |
3057 | there is no next recent job. */ | |
3058 | static int | |
3059 | most_recent_job_in_state (job, state) | |
3060 | int job; | |
3061 | JOB_STATE state; | |
3062 | { | |
3063 | register int i, result; | |
3064 | sigset_t set, oset; | |
3065 | ||
3066 | BLOCK_CHILD (set, oset); | |
7117c2d2 | 3067 | |
ccc6cda3 | 3068 | for (result = NO_JOB, i = job - 1; i >= 0; i--) |
726f6388 | 3069 | { |
ccc6cda3 | 3070 | if (jobs[i] && (JOBSTATE (i) == state)) |
726f6388 | 3071 | { |
ccc6cda3 JA |
3072 | result = i; |
3073 | break; | |
726f6388 JA |
3074 | } |
3075 | } | |
7117c2d2 | 3076 | |
726f6388 | 3077 | UNBLOCK_CHILD (oset); |
ccc6cda3 | 3078 | |
726f6388 JA |
3079 | return (result); |
3080 | } | |
3081 | ||
3082 | /* Return the newest *stopped* job older than JOB, or NO_JOB if not | |
3083 | found. */ | |
3084 | static int | |
28ef6c31 | 3085 | job_last_stopped (job) |
726f6388 JA |
3086 | int job; |
3087 | { | |
3088 | return (most_recent_job_in_state (job, JSTOPPED)); | |
3089 | } | |
3090 | ||
3091 | /* Return the newest *running* job older than JOB, or NO_JOB if not | |
3092 | found. */ | |
3093 | static int | |
28ef6c31 | 3094 | job_last_running (job) |
726f6388 JA |
3095 | int job; |
3096 | { | |
3097 | return (most_recent_job_in_state (job, JRUNNING)); | |
3098 | } | |
3099 | ||
3100 | /* Make JOB be the current job, and make previous be useful. Must be | |
3101 | called with SIGCHLD blocked. */ | |
3102 | static void | |
3103 | set_current_job (job) | |
3104 | int job; | |
3105 | { | |
ccc6cda3 | 3106 | int candidate; |
726f6388 | 3107 | |
95732b49 | 3108 | if (js.j_current != job) |
726f6388 | 3109 | { |
95732b49 JA |
3110 | js.j_previous = js.j_current; |
3111 | js.j_current = job; | |
726f6388 JA |
3112 | } |
3113 | ||
95732b49 JA |
3114 | /* First choice for previous job is the old current job. */ |
3115 | if (js.j_previous != js.j_current && | |
3116 | js.j_previous != NO_JOB && | |
3117 | jobs[js.j_previous] && | |
3118 | STOPPED (js.j_previous)) | |
726f6388 JA |
3119 | return; |
3120 | ||
3121 | /* Second choice: Newest stopped job that is older than | |
3122 | the current job. */ | |
ccc6cda3 | 3123 | candidate = NO_JOB; |
95732b49 | 3124 | if (STOPPED (js.j_current)) |
726f6388 | 3125 | { |
95732b49 | 3126 | candidate = job_last_stopped (js.j_current); |
726f6388 JA |
3127 | |
3128 | if (candidate != NO_JOB) | |
3129 | { | |
95732b49 | 3130 | js.j_previous = candidate; |
726f6388 JA |
3131 | return; |
3132 | } | |
3133 | } | |
3134 | ||
3135 | /* If we get here, there is either only one stopped job, in which case it is | |
3136 | the current job and the previous job should be set to the newest running | |
3137 | job, or there are only running jobs and the previous job should be set to | |
3138 | the newest running job older than the current job. We decide on which | |
95732b49 | 3139 | alternative to use based on whether or not JOBSTATE(js.j_current) is |
726f6388 JA |
3140 | JSTOPPED. */ |
3141 | ||
95732b49 JA |
3142 | candidate = RUNNING (js.j_current) ? job_last_running (js.j_current) |
3143 | : job_last_running (js.j_jobslots); | |
726f6388 JA |
3144 | |
3145 | if (candidate != NO_JOB) | |
3146 | { | |
95732b49 | 3147 | js.j_previous = candidate; |
726f6388 JA |
3148 | return; |
3149 | } | |
3150 | ||
3151 | /* There is only a single job, and it is both `+' and `-'. */ | |
95732b49 | 3152 | js.j_previous = js.j_current; |
726f6388 JA |
3153 | } |
3154 | ||
3155 | /* Make current_job be something useful, if it isn't already. */ | |
3156 | ||
3157 | /* Here's the deal: The newest non-running job should be `+', and the | |
3158 | next-newest non-running job should be `-'. If there is only a single | |
95732b49 | 3159 | stopped job, the js.j_previous is the newest non-running job. If there |
726f6388 JA |
3160 | are only running jobs, the newest running job is `+' and the |
3161 | next-newest running job is `-'. Must be called with SIGCHLD blocked. */ | |
ccc6cda3 | 3162 | |
726f6388 JA |
3163 | static void |
3164 | reset_current () | |
3165 | { | |
ccc6cda3 | 3166 | int candidate; |
726f6388 | 3167 | |
95732b49 JA |
3168 | if (js.j_jobslots && js.j_current != NO_JOB && jobs[js.j_current] && STOPPED (js.j_current)) |
3169 | candidate = js.j_current; | |
726f6388 JA |
3170 | else |
3171 | { | |
ccc6cda3 JA |
3172 | candidate = NO_JOB; |
3173 | ||
3174 | /* First choice: the previous job. */ | |
95732b49 JA |
3175 | if (js.j_previous != NO_JOB && jobs[js.j_previous] && STOPPED (js.j_previous)) |
3176 | candidate = js.j_previous; | |
726f6388 JA |
3177 | |
3178 | /* Second choice: the most recently stopped job. */ | |
3179 | if (candidate == NO_JOB) | |
95732b49 | 3180 | candidate = job_last_stopped (js.j_jobslots); |
726f6388 | 3181 | |
ccc6cda3 | 3182 | /* Third choice: the newest running job. */ |
726f6388 | 3183 | if (candidate == NO_JOB) |
95732b49 | 3184 | candidate = job_last_running (js.j_jobslots); |
726f6388 JA |
3185 | } |
3186 | ||
3187 | /* If we found a job to use, then use it. Otherwise, there | |
3188 | are no jobs period. */ | |
3189 | if (candidate != NO_JOB) | |
3190 | set_current_job (candidate); | |
3191 | else | |
95732b49 | 3192 | js.j_current = js.j_previous = NO_JOB; |
726f6388 JA |
3193 | } |
3194 | ||
d166f048 JA |
3195 | /* Set up the job structures so we know the job and its processes are |
3196 | all running. */ | |
3197 | static void | |
3198 | set_job_running (job) | |
3199 | int job; | |
3200 | { | |
3201 | register PROCESS *p; | |
3202 | ||
3203 | /* Each member of the pipeline is now running. */ | |
3204 | p = jobs[job]->pipe; | |
3205 | ||
3206 | do | |
3207 | { | |
3208 | if (WIFSTOPPED (p->status)) | |
7117c2d2 | 3209 | p->running = PS_RUNNING; /* XXX - could be PS_STOPPED */ |
d166f048 JA |
3210 | p = p->next; |
3211 | } | |
3212 | while (p != jobs[job]->pipe); | |
3213 | ||
3214 | /* This means that the job is running. */ | |
3215 | JOBSTATE (job) = JRUNNING; | |
3216 | } | |
3217 | ||
726f6388 JA |
3218 | /* Start a job. FOREGROUND if non-zero says to do that. Otherwise, |
3219 | start the job in the background. JOB is a zero-based index into | |
3220 | JOBS. Returns -1 if it is unable to start a job, and the return | |
3221 | status of the job otherwise. */ | |
3222 | int | |
3223 | start_job (job, foreground) | |
3224 | int job, foreground; | |
3225 | { | |
3226 | register PROCESS *p; | |
3227 | int already_running; | |
3228 | sigset_t set, oset; | |
95732b49 | 3229 | char *wd, *s; |
28ef6c31 | 3230 | static TTYSTRUCT save_stty; |
726f6388 JA |
3231 | |
3232 | BLOCK_CHILD (set, oset); | |
726f6388 | 3233 | |
ccc6cda3 | 3234 | if (DEADJOB (job)) |
726f6388 | 3235 | { |
b80f6443 | 3236 | internal_error (_("%s: job has terminated"), this_command_name); |
726f6388 JA |
3237 | UNBLOCK_CHILD (oset); |
3238 | return (-1); | |
3239 | } | |
3240 | ||
ccc6cda3 JA |
3241 | already_running = RUNNING (job); |
3242 | ||
3243 | if (foreground == 0 && already_running) | |
726f6388 | 3244 | { |
b80f6443 | 3245 | internal_error (_("%s: job %d already in background"), this_command_name, job + 1); |
726f6388 | 3246 | UNBLOCK_CHILD (oset); |
95732b49 | 3247 | return (0); /* XPG6/SUSv3 says this is not an error */ |
726f6388 JA |
3248 | } |
3249 | ||
3250 | wd = current_working_directory (); | |
3251 | ||
3252 | /* You don't know about the state of this job. Do you? */ | |
3253 | jobs[job]->flags &= ~J_NOTIFIED; | |
3254 | ||
3255 | if (foreground) | |
3256 | { | |
3257 | set_current_job (job); | |
3258 | jobs[job]->flags |= J_FOREGROUND; | |
3259 | } | |
3260 | ||
3261 | /* Tell the outside world what we're doing. */ | |
3262 | p = jobs[job]->pipe; | |
3263 | ||
ccc6cda3 | 3264 | if (foreground == 0) |
95732b49 JA |
3265 | { |
3266 | /* POSIX.2 says `bg' doesn't give any indication about current or | |
3267 | previous job. */ | |
3268 | if (posixly_correct == 0) | |
3269 | s = (job == js.j_current) ? "+ ": ((job == js.j_previous) ? "- " : " "); | |
3270 | else | |
3271 | s = " "; | |
3272 | printf ("[%d]%s", job + 1, s); | |
3273 | } | |
726f6388 JA |
3274 | |
3275 | do | |
3276 | { | |
95732b49 | 3277 | printf ("%s%s", |
726f6388 JA |
3278 | p->command ? p->command : "", |
3279 | p->next != jobs[job]->pipe? " | " : ""); | |
3280 | p = p->next; | |
3281 | } | |
3282 | while (p != jobs[job]->pipe); | |
3283 | ||
ccc6cda3 | 3284 | if (foreground == 0) |
95732b49 | 3285 | printf (" &"); |
726f6388 JA |
3286 | |
3287 | if (strcmp (wd, jobs[job]->wd) != 0) | |
95732b49 | 3288 | printf (" (wd: %s)", polite_directory_format (jobs[job]->wd)); |
726f6388 | 3289 | |
95732b49 | 3290 | printf ("\n"); |
726f6388 JA |
3291 | |
3292 | /* Run the job. */ | |
ccc6cda3 | 3293 | if (already_running == 0) |
d166f048 | 3294 | set_job_running (job); |
726f6388 JA |
3295 | |
3296 | /* Save the tty settings before we start the job in the foreground. */ | |
3297 | if (foreground) | |
3298 | { | |
3299 | get_tty_state (); | |
3300 | save_stty = shell_tty_info; | |
ccc6cda3 JA |
3301 | /* Give the terminal to this job. */ |
3302 | if (IS_JOBCONTROL (job)) | |
28ef6c31 | 3303 | give_terminal_to (jobs[job]->pgrp, 0); |
726f6388 JA |
3304 | } |
3305 | else | |
3306 | jobs[job]->flags &= ~J_FOREGROUND; | |
3307 | ||
3308 | /* If the job is already running, then don't bother jump-starting it. */ | |
ccc6cda3 | 3309 | if (already_running == 0) |
726f6388 JA |
3310 | { |
3311 | jobs[job]->flags |= J_NOTIFIED; | |
3312 | killpg (jobs[job]->pgrp, SIGCONT); | |
3313 | } | |
3314 | ||
726f6388 JA |
3315 | if (foreground) |
3316 | { | |
ccc6cda3 | 3317 | pid_t pid; |
0628567a | 3318 | int st; |
726f6388 | 3319 | |
7117c2d2 JA |
3320 | pid = find_last_pid (job, 0); |
3321 | UNBLOCK_CHILD (oset); | |
0628567a | 3322 | st = wait_for (pid); |
726f6388 JA |
3323 | shell_tty_info = save_stty; |
3324 | set_tty_state (); | |
0628567a | 3325 | return (st); |
726f6388 JA |
3326 | } |
3327 | else | |
3328 | { | |
726f6388 JA |
3329 | reset_current (); |
3330 | UNBLOCK_CHILD (oset); | |
3331 | return (0); | |
3332 | } | |
3333 | } | |
3334 | ||
3335 | /* Give PID SIGNAL. This determines what job the pid belongs to (if any). | |
3336 | If PID does belong to a job, and the job is stopped, then CONTinue the | |
3337 | job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null, | |
3338 | then kill the process group associated with PID. */ | |
3339 | int | |
3340 | kill_pid (pid, sig, group) | |
3341 | pid_t pid; | |
3342 | int sig, group; | |
3343 | { | |
3344 | register PROCESS *p; | |
95732b49 | 3345 | int job, result, negative; |
726f6388 JA |
3346 | sigset_t set, oset; |
3347 | ||
95732b49 JA |
3348 | if (pid < -1) |
3349 | { | |
3350 | pid = -pid; | |
3351 | group = negative = 1; | |
3352 | } | |
3353 | else | |
3354 | negative = 0; | |
3355 | ||
ccc6cda3 | 3356 | result = EXECUTION_SUCCESS; |
726f6388 JA |
3357 | if (group) |
3358 | { | |
f73dda09 | 3359 | BLOCK_CHILD (set, oset); |
7117c2d2 | 3360 | p = find_pipeline (pid, 0, &job); |
f73dda09 | 3361 | |
726f6388 JA |
3362 | if (job != NO_JOB) |
3363 | { | |
3364 | jobs[job]->flags &= ~J_NOTIFIED; | |
3365 | ||
3366 | /* Kill process in backquotes or one started without job control? */ | |
95732b49 JA |
3367 | |
3368 | /* If we're passed a pid < -1, just call killpg and see what happens */ | |
3369 | if (negative && jobs[job]->pgrp == shell_pgrp) | |
3370 | result = killpg (pid, sig); | |
3371 | /* If we're killing using job control notification, for example, | |
3372 | without job control active, we have to do things ourselves. */ | |
3373 | else if (jobs[job]->pgrp == shell_pgrp) | |
726f6388 JA |
3374 | { |
3375 | p = jobs[job]->pipe; | |
726f6388 JA |
3376 | do |
3377 | { | |
95732b49 JA |
3378 | if (PALIVE (p) == 0) |
3379 | continue; /* avoid pid recycling problem */ | |
726f6388 | 3380 | kill (p->pid, sig); |
95732b49 | 3381 | if (PEXITED (p) && (sig == SIGTERM || sig == SIGHUP)) |
726f6388 JA |
3382 | kill (p->pid, SIGCONT); |
3383 | p = p->next; | |
3384 | } | |
95732b49 | 3385 | while (p != jobs[job]->pipe); |
726f6388 JA |
3386 | } |
3387 | else | |
3388 | { | |
3389 | result = killpg (jobs[job]->pgrp, sig); | |
ccc6cda3 | 3390 | if (p && STOPPED (job) && (sig == SIGTERM || sig == SIGHUP)) |
726f6388 | 3391 | killpg (jobs[job]->pgrp, SIGCONT); |
d166f048 JA |
3392 | /* If we're continuing a stopped job via kill rather than bg or |
3393 | fg, emulate the `bg' behavior. */ | |
3394 | if (p && STOPPED (job) && (sig == SIGCONT)) | |
3395 | { | |
3396 | set_job_running (job); | |
3397 | jobs[job]->flags &= ~J_FOREGROUND; | |
3398 | jobs[job]->flags |= J_NOTIFIED; | |
3399 | } | |
726f6388 JA |
3400 | } |
3401 | } | |
3402 | else | |
3403 | result = killpg (pid, sig); | |
f73dda09 JA |
3404 | |
3405 | UNBLOCK_CHILD (oset); | |
726f6388 JA |
3406 | } |
3407 | else | |
3408 | result = kill (pid, sig); | |
3409 | ||
726f6388 JA |
3410 | return (result); |
3411 | } | |
3412 | ||
ccc6cda3 JA |
3413 | /* sigchld_handler () flushes at least one of the children that we are |
3414 | waiting for. It gets run when we have gotten a SIGCHLD signal. */ | |
726f6388 | 3415 | static sighandler |
ccc6cda3 | 3416 | sigchld_handler (sig) |
726f6388 JA |
3417 | int sig; |
3418 | { | |
bb70624e | 3419 | int n, oerrno; |
ccc6cda3 | 3420 | |
bb70624e | 3421 | oerrno = errno; |
726f6388 JA |
3422 | REINSTALL_SIGCHLD_HANDLER; |
3423 | sigchld++; | |
ccc6cda3 | 3424 | n = 0; |
7117c2d2 | 3425 | if (queue_sigchld == 0) |
ccc6cda3 | 3426 | n = waitchld (-1, 0); |
bb70624e | 3427 | errno = oerrno; |
ccc6cda3 | 3428 | SIGRETURN (n); |
726f6388 | 3429 | } |
ccc6cda3 JA |
3430 | |
3431 | /* waitchld() reaps dead or stopped children. It's called by wait_for and | |
bb70624e JA |
3432 | sigchld_handler, and runs until there aren't any children terminating any |
3433 | more. | |
ccc6cda3 | 3434 | If BLOCK is 1, this is to be a blocking wait for a single child, although |
bb70624e JA |
3435 | an arriving SIGCHLD could cause the wait to be non-blocking. It returns |
3436 | the number of children reaped, or -1 if there are no unwaited-for child | |
3437 | processes. */ | |
726f6388 | 3438 | static int |
ccc6cda3 JA |
3439 | waitchld (wpid, block) |
3440 | pid_t wpid; | |
3441 | int block; | |
726f6388 JA |
3442 | { |
3443 | WAIT status; | |
3444 | PROCESS *child; | |
3445 | pid_t pid; | |
ac50fbac | 3446 | |
28ef6c31 | 3447 | int call_set_current, last_stopped_job, job, children_exited, waitpid_flags; |
95732b49 | 3448 | static int wcontinued = WCONTINUED; /* run-time fix for glibc problem */ |
ccc6cda3 JA |
3449 | |
3450 | call_set_current = children_exited = 0; | |
3451 | last_stopped_job = NO_JOB; | |
726f6388 JA |
3452 | |
3453 | do | |
3454 | { | |
d166f048 | 3455 | /* We don't want to be notified about jobs stopping if job control |
28ef6c31 | 3456 | is not active. XXX - was interactive_shell instead of job_control */ |
d166f048 | 3457 | waitpid_flags = (job_control && subshell_environment == 0) |
95732b49 | 3458 | ? (WUNTRACED|wcontinued) |
ccc6cda3 JA |
3459 | : 0; |
3460 | if (sigchld || block == 0) | |
3461 | waitpid_flags |= WNOHANG; | |
ac50fbac | 3462 | |
0001803f | 3463 | /* Check for terminating signals and exit the shell if we receive one */ |
0628567a | 3464 | CHECK_TERMSIG; |
ac50fbac CR |
3465 | /* Check for a trapped signal interrupting the wait builtin and jump out */ |
3466 | CHECK_WAIT_INTR; | |
3185942a | 3467 | |
0001803f CR |
3468 | if (block == 1 && queue_sigchld == 0 && (waitpid_flags & WNOHANG) == 0) |
3469 | { | |
3470 | internal_warning (_("waitchld: turning on WNOHANG to avoid indefinite block")); | |
3471 | waitpid_flags |= WNOHANG; | |
3472 | } | |
3473 | ||
ccc6cda3 | 3474 | pid = WAITPID (-1, &status, waitpid_flags); |
f73dda09 | 3475 | |
ac50fbac CR |
3476 | #if 0 |
3477 | if (wpid != -1 && block) | |
3478 | itrace("waitchld: blocking waitpid returns %d", pid); | |
a0c0a00f CR |
3479 | #endif |
3480 | #if 0 | |
3481 | if (wpid != -1) | |
3482 | itrace("waitchld: %s waitpid returns %d", block?"blocking":"non-blocking", pid); | |
ac50fbac | 3483 | #endif |
95732b49 JA |
3484 | /* WCONTINUED may be rejected by waitpid as invalid even when defined */ |
3485 | if (wcontinued && pid < 0 && errno == EINVAL) | |
3486 | { | |
3487 | wcontinued = 0; | |
3488 | continue; /* jump back to the test and retry without WCONTINUED */ | |
3489 | } | |
3490 | ||
ccc6cda3 JA |
3491 | /* The check for WNOHANG is to make sure we decrement sigchld only |
3492 | if it was non-zero before we called waitpid. */ | |
3493 | if (sigchld > 0 && (waitpid_flags & WNOHANG)) | |
3494 | sigchld--; | |
ac50fbac | 3495 | |
bb70624e JA |
3496 | /* If waitpid returns -1 with errno == ECHILD, there are no more |
3497 | unwaited-for child processes of this shell. */ | |
3498 | if (pid < 0 && errno == ECHILD) | |
3499 | { | |
3500 | if (children_exited == 0) | |
3501 | return -1; | |
3502 | else | |
3503 | break; | |
3504 | } | |
ccc6cda3 | 3505 | |
ac50fbac | 3506 | #if 0 |
a0c0a00f | 3507 | itrace("waitchld: waitpid returns %d block = %d children_exited = %d", pid, block, children_exited); |
ac50fbac | 3508 | #endif |
bb70624e JA |
3509 | /* If waitpid returns 0, there are running children. If it returns -1, |
3510 | the only other error POSIX says it can return is EINTR. */ | |
0628567a | 3511 | CHECK_TERMSIG; |
ac50fbac CR |
3512 | CHECK_WAIT_INTR; |
3513 | ||
3514 | /* If waitpid returns -1/EINTR and the shell saw a SIGINT, then we | |
3515 | assume the child has blocked or handled SIGINT. In that case, we | |
3516 | require the child to actually die due to SIGINT to act on the | |
3517 | SIGINT we received; otherwise we assume the child handled it and | |
3518 | let it go. */ | |
3519 | if (pid < 0 && errno == EINTR && wait_sigint_received) | |
3520 | child_caught_sigint = 1; | |
3521 | ||
ccc6cda3 JA |
3522 | if (pid <= 0) |
3523 | continue; /* jumps right to the test */ | |
3524 | ||
a0c0a00f CR |
3525 | /* Linux kernels appear to signal the parent but not interrupt the |
3526 | waitpid() (or restart it even without SA_RESTART) on SIGINT, so if | |
3527 | we saw a SIGINT and the process exited or died due to some other | |
3528 | signal, assume the child caught the SIGINT. */ | |
3529 | if (wait_sigint_received && (WIFSIGNALED (status) == 0 || WTERMSIG (status) != SIGINT)) | |
3530 | child_caught_sigint = 1; | |
3531 | ||
ac50fbac CR |
3532 | /* If the child process did die due to SIGINT, forget our assumption |
3533 | that it caught or otherwise handled it. */ | |
3534 | if (WIFSIGNALED (status) && WTERMSIG (status) == SIGINT) | |
3535 | child_caught_sigint = 0; | |
3536 | ||
f73dda09 JA |
3537 | /* children_exited is used to run traps on SIGCHLD. We don't want to |
3538 | run the trap if a process is just being continued. */ | |
3539 | if (WIFCONTINUED(status) == 0) | |
0628567a JA |
3540 | { |
3541 | children_exited++; | |
3542 | js.c_living--; | |
3543 | } | |
ccc6cda3 JA |
3544 | |
3545 | /* Locate our PROCESS for this pid. */ | |
95732b49 | 3546 | child = find_process (pid, 1, &job); /* want living procs only */ |
ccc6cda3 | 3547 | |
3185942a | 3548 | #if defined (COPROCESS_SUPPORT) |
ac50fbac | 3549 | coproc_pidchk (pid, WSTATUS(status)); |
3185942a JA |
3550 | #endif |
3551 | ||
ccc6cda3 JA |
3552 | /* It is not an error to have a child terminate that we did |
3553 | not have a record of. This child could have been part of | |
3554 | a pipeline in backquote substitution. Even so, I'm not | |
3555 | sure child is ever non-zero. */ | |
3556 | if (child == 0) | |
3185942a JA |
3557 | { |
3558 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
3559 | js.c_reaped++; | |
3560 | continue; | |
3561 | } | |
ccc6cda3 | 3562 | |
f73dda09 | 3563 | /* Remember status, and whether or not the process is running. */ |
ccc6cda3 | 3564 | child->status = status; |
7117c2d2 | 3565 | child->running = WIFCONTINUED(status) ? PS_RUNNING : PS_DONE; |
ccc6cda3 | 3566 | |
95732b49 JA |
3567 | if (PEXITED (child)) |
3568 | { | |
3569 | js.c_totreaped++; | |
3570 | if (job != NO_JOB) | |
3571 | js.c_reaped++; | |
3572 | } | |
a0c0a00f | 3573 | |
ccc6cda3 | 3574 | if (job == NO_JOB) |
28ef6c31 | 3575 | continue; |
726f6388 | 3576 | |
28ef6c31 | 3577 | call_set_current += set_job_status_and_cleanup (job); |
726f6388 | 3578 | |
28ef6c31 JA |
3579 | if (STOPPED (job)) |
3580 | last_stopped_job = job; | |
3581 | else if (DEADJOB (job) && last_stopped_job == job) | |
3582 | last_stopped_job = NO_JOB; | |
726f6388 | 3583 | } |
ccc6cda3 | 3584 | while ((sigchld || block == 0) && pid > (pid_t)0); |
726f6388 JA |
3585 | |
3586 | /* If a job was running and became stopped, then set the current | |
3587 | job. Otherwise, don't change a thing. */ | |
3588 | if (call_set_current) | |
bb70624e JA |
3589 | { |
3590 | if (last_stopped_job != NO_JOB) | |
3591 | set_current_job (last_stopped_job); | |
3592 | else | |
3593 | reset_current (); | |
3594 | } | |
726f6388 JA |
3595 | |
3596 | /* Call a SIGCHLD trap handler for each child that exits, if one is set. */ | |
a0c0a00f CR |
3597 | if (job_control && children_exited && |
3598 | (signal_is_trapped (SIGCHLD) || trap_list[SIGCHLD] == (char *)IMPOSSIBLE_TRAP_HANDLER) && | |
726f6388 | 3599 | trap_list[SIGCHLD] != (char *)IGNORE_SIG) |
3185942a | 3600 | { |
0001803f | 3601 | if (posixly_correct && this_shell_builtin && this_shell_builtin == wait_builtin) |
3185942a JA |
3602 | { |
3603 | interrupt_immediately = 0; | |
d836e8a2 CR |
3604 | /* This was trap_handler (SIGCHLD) but that can lose traps if |
3605 | children_exited > 1 */ | |
3606 | queue_sigchld_trap (children_exited); | |
3185942a | 3607 | wait_signal_received = SIGCHLD; |
ac50fbac CR |
3608 | /* If we're in a signal handler, let CHECK_WAIT_INTR pick it up; |
3609 | run_pending_traps will call run_sigchld_trap later */ | |
a0c0a00f CR |
3610 | if (sigchld == 0 && wait_intr_flag) |
3611 | sh_longjmp (wait_intr_buf, 1); | |
3185942a | 3612 | } |
ac50fbac CR |
3613 | /* If not in posix mode and not executing the wait builtin, queue the |
3614 | signal for later handling. Run the trap immediately if we are | |
3615 | executing the wait builtin, but don't break out of `wait'. */ | |
3616 | else if (sigchld) /* called from signal handler */ | |
3617 | queue_sigchld_trap (children_exited); | |
a0c0a00f CR |
3618 | else if (signal_in_progress (SIGCHLD)) |
3619 | queue_sigchld_trap (children_exited); | |
3620 | else if (trap_list[SIGCHLD] == (char *)IMPOSSIBLE_TRAP_HANDLER) | |
3621 | queue_sigchld_trap (children_exited); | |
ac50fbac CR |
3622 | else if (running_trap) |
3623 | queue_sigchld_trap (children_exited); | |
3624 | else if (this_shell_builtin == wait_builtin) | |
3625 | run_sigchld_trap (children_exited); /* XXX */ | |
3626 | else | |
3627 | queue_sigchld_trap (children_exited); | |
3185942a | 3628 | } |
726f6388 JA |
3629 | |
3630 | /* We have successfully recorded the useful information about this process | |
3631 | that has just changed state. If we notify asynchronously, and the job | |
3632 | that this process belongs to is no longer running, then notify the user | |
3633 | of that fact now. */ | |
3634 | if (asynchronous_notification && interactive) | |
3635 | notify_of_job_status (); | |
3636 | ||
ccc6cda3 | 3637 | return (children_exited); |
726f6388 JA |
3638 | } |
3639 | ||
28ef6c31 JA |
3640 | /* Set the status of JOB and perform any necessary cleanup if the job is |
3641 | marked as JDEAD. | |
3642 | ||
3643 | Currently, the cleanup activity is restricted to handling any SIGINT | |
3644 | received while waiting for a foreground job to finish. */ | |
3645 | static int | |
3646 | set_job_status_and_cleanup (job) | |
3647 | int job; | |
3648 | { | |
3649 | PROCESS *child; | |
3650 | int tstatus, job_state, any_stopped, any_tstped, call_set_current; | |
3651 | SigHandler *temp_handler; | |
3652 | ||
3653 | child = jobs[job]->pipe; | |
3654 | jobs[job]->flags &= ~J_NOTIFIED; | |
3655 | ||
3656 | call_set_current = 0; | |
3657 | ||
3658 | /* | |
3659 | * COMPUTE JOB STATUS | |
3660 | */ | |
3661 | ||
3662 | /* If all children are not running, but any of them is stopped, then | |
3663 | the job is stopped, not dead. */ | |
3664 | job_state = any_stopped = any_tstped = 0; | |
3665 | do | |
3666 | { | |
95732b49 JA |
3667 | job_state |= PRUNNING (child); |
3668 | #if 0 | |
3669 | if (PEXITED (child) && (WIFSTOPPED (child->status))) | |
3670 | #else | |
3671 | /* Only checking for WIFSTOPPED now, not for PS_DONE */ | |
3672 | if (PSTOPPED (child)) | |
3673 | #endif | |
28ef6c31 JA |
3674 | { |
3675 | any_stopped = 1; | |
ac50fbac | 3676 | any_tstped |= job_control && (WSTOPSIG (child->status) == SIGTSTP); |
28ef6c31 JA |
3677 | } |
3678 | child = child->next; | |
3679 | } | |
3680 | while (child != jobs[job]->pipe); | |
3681 | ||
3682 | /* If job_state != 0, the job is still running, so don't bother with | |
f73dda09 JA |
3683 | setting the process exit status and job state unless we're |
3684 | transitioning from stopped to running. */ | |
3685 | if (job_state != 0 && JOBSTATE(job) != JSTOPPED) | |
28ef6c31 JA |
3686 | return 0; |
3687 | ||
3688 | /* | |
3689 | * SET JOB STATUS | |
3690 | */ | |
3691 | ||
3692 | /* The job is either stopped or dead. Set the state of the job accordingly. */ | |
3693 | if (any_stopped) | |
3694 | { | |
3695 | jobs[job]->state = JSTOPPED; | |
3696 | jobs[job]->flags &= ~J_FOREGROUND; | |
3697 | call_set_current++; | |
3698 | /* Suspending a job with SIGTSTP breaks all active loops. */ | |
3699 | if (any_tstped && loop_level) | |
3700 | breaking = loop_level; | |
3701 | } | |
f73dda09 JA |
3702 | else if (job_state != 0) /* was stopped, now running */ |
3703 | { | |
3704 | jobs[job]->state = JRUNNING; | |
3705 | call_set_current++; | |
3706 | } | |
28ef6c31 JA |
3707 | else |
3708 | { | |
3709 | jobs[job]->state = JDEAD; | |
95732b49 | 3710 | js.j_ndead++; |
28ef6c31 | 3711 | |
7117c2d2 | 3712 | #if 0 |
28ef6c31 JA |
3713 | if (IS_FOREGROUND (job)) |
3714 | setjstatus (job); | |
7117c2d2 | 3715 | #endif |
28ef6c31 JA |
3716 | |
3717 | /* If this job has a cleanup function associated with it, call it | |
3718 | with `cleanarg' as the single argument, then set the function | |
3719 | pointer to NULL so it is not inadvertently called twice. The | |
3720 | cleanup function is responsible for deallocating cleanarg. */ | |
3721 | if (jobs[job]->j_cleanup) | |
3722 | { | |
3723 | (*jobs[job]->j_cleanup) (jobs[job]->cleanarg); | |
f73dda09 | 3724 | jobs[job]->j_cleanup = (sh_vptrfunc_t *)NULL; |
28ef6c31 JA |
3725 | } |
3726 | } | |
3727 | ||
3728 | /* | |
3729 | * CLEANUP | |
3730 | * | |
3731 | * Currently, we just do special things if we got a SIGINT while waiting | |
3732 | * for a foreground job to complete | |
3733 | */ | |
3734 | ||
95732b49 | 3735 | if (JOBSTATE (job) == JDEAD) |
28ef6c31 JA |
3736 | { |
3737 | /* If we're running a shell script and we get a SIGINT with a | |
3738 | SIGINT trap handler, but the foreground job handles it and | |
3739 | does not exit due to SIGINT, run the trap handler but do not | |
3740 | otherwise act as if we got the interrupt. */ | |
3741 | if (wait_sigint_received && interactive_shell == 0 && | |
ac50fbac | 3742 | child_caught_sigint && IS_FOREGROUND (job) && |
28ef6c31 JA |
3743 | signal_is_trapped (SIGINT)) |
3744 | { | |
7117c2d2 | 3745 | int old_frozen; |
28ef6c31 JA |
3746 | wait_sigint_received = 0; |
3747 | last_command_exit_value = process_exit_status (child->status); | |
3748 | ||
7117c2d2 | 3749 | old_frozen = jobs_list_frozen; |
28ef6c31 JA |
3750 | jobs_list_frozen = 1; |
3751 | tstatus = maybe_call_trap_handler (SIGINT); | |
7117c2d2 | 3752 | jobs_list_frozen = old_frozen; |
28ef6c31 JA |
3753 | } |
3754 | ||
3755 | /* If the foreground job is killed by SIGINT when job control is not | |
3756 | active, we need to perform some special handling. | |
3757 | ||
3758 | The check of wait_sigint_received is a way to determine if the | |
3759 | SIGINT came from the keyboard (in which case the shell has already | |
3760 | seen it, and wait_sigint_received is non-zero, because keyboard | |
3761 | signals are sent to process groups) or via kill(2) to the foreground | |
3762 | process by another process (or itself). If the shell did receive the | |
a0c0a00f CR |
3763 | SIGINT, it needs to perform normal SIGINT processing. XXX - should |
3764 | this change its behavior depending on whether the last command in an | |
3765 | pipeline exited due to SIGINT, or any process in the pipeline? Right | |
3766 | now it does this if any process in the pipeline exits due to SIGINT. */ | |
ac50fbac CR |
3767 | else if (wait_sigint_received && |
3768 | child_caught_sigint == 0 && | |
28ef6c31 JA |
3769 | IS_FOREGROUND (job) && IS_JOBCONTROL (job) == 0) |
3770 | { | |
7117c2d2 JA |
3771 | int old_frozen; |
3772 | ||
28ef6c31 JA |
3773 | wait_sigint_received = 0; |
3774 | ||
3775 | /* If SIGINT is trapped, set the exit status so that the trap | |
3776 | handler can see it. */ | |
3777 | if (signal_is_trapped (SIGINT)) | |
3778 | last_command_exit_value = process_exit_status (child->status); | |
3779 | ||
3780 | /* If the signal is trapped, let the trap handler get it no matter | |
3781 | what and simply return if the trap handler returns. | |
3782 | maybe_call_trap_handler() may cause dead jobs to be removed from | |
3783 | the job table because of a call to execute_command. We work | |
3784 | around this by setting JOBS_LIST_FROZEN. */ | |
7117c2d2 | 3785 | old_frozen = jobs_list_frozen; |
28ef6c31 JA |
3786 | jobs_list_frozen = 1; |
3787 | tstatus = maybe_call_trap_handler (SIGINT); | |
7117c2d2 | 3788 | jobs_list_frozen = old_frozen; |
28ef6c31 JA |
3789 | if (tstatus == 0 && old_sigint_handler != INVALID_SIGNAL_HANDLER) |
3790 | { | |
3791 | /* wait_sigint_handler () has already seen SIGINT and | |
3792 | allowed the wait builtin to jump out. We need to | |
3793 | call the original SIGINT handler, if necessary. If | |
3794 | the original handler is SIG_DFL, we need to resend | |
3795 | the signal to ourselves. */ | |
3796 | ||
3797 | temp_handler = old_sigint_handler; | |
3798 | ||
3799 | /* Bogus. If we've reset the signal handler as the result | |
3800 | of a trap caught on SIGINT, then old_sigint_handler | |
3801 | will point to trap_handler, which now knows nothing about | |
3802 | SIGINT (if we reset the sighandler to the default). | |
3803 | In this case, we have to fix things up. What a crock. */ | |
3804 | if (temp_handler == trap_handler && signal_is_trapped (SIGINT) == 0) | |
3805 | temp_handler = trap_to_sighandler (SIGINT); | |
a0c0a00f | 3806 | restore_sigint_handler (); |
95732b49 | 3807 | if (temp_handler == SIG_DFL) |
ac50fbac | 3808 | termsig_handler (SIGINT); /* XXX */ |
95732b49 JA |
3809 | else if (temp_handler != SIG_IGN) |
3810 | (*temp_handler) (SIGINT); | |
28ef6c31 JA |
3811 | } |
3812 | } | |
3813 | } | |
3814 | ||
3815 | return call_set_current; | |
3816 | } | |
3817 | ||
3818 | /* Build the array of values for the $PIPESTATUS variable from the set of | |
3819 | exit statuses of all processes in the job J. */ | |
3820 | static void | |
3821 | setjstatus (j) | |
3822 | int j; | |
3823 | { | |
3824 | #if defined (ARRAY_VARS) | |
3825 | register int i; | |
3826 | register PROCESS *p; | |
3827 | ||
3828 | for (i = 1, p = jobs[j]->pipe; p->next != jobs[j]->pipe; p = p->next, i++) | |
3829 | ; | |
3830 | i++; | |
7117c2d2 | 3831 | if (statsize < i) |
28ef6c31 JA |
3832 | { |
3833 | pstatuses = (int *)xrealloc (pstatuses, i * sizeof (int)); | |
3834 | statsize = i; | |
3835 | } | |
3836 | i = 0; | |
3837 | p = jobs[j]->pipe; | |
3838 | do | |
3839 | { | |
3840 | pstatuses[i++] = process_exit_status (p->status); | |
3841 | p = p->next; | |
3842 | } | |
3843 | while (p != jobs[j]->pipe); | |
3844 | ||
3845 | pstatuses[i] = -1; /* sentinel */ | |
7117c2d2 | 3846 | set_pipestatus_array (pstatuses, i); |
28ef6c31 JA |
3847 | #endif |
3848 | } | |
3849 | ||
3185942a | 3850 | void |
28ef6c31 JA |
3851 | run_sigchld_trap (nchild) |
3852 | int nchild; | |
3853 | { | |
3854 | char *trap_command; | |
3855 | int i; | |
3856 | ||
3857 | /* Turn off the trap list during the call to parse_and_execute () | |
3858 | to avoid potentially infinite recursive calls. Preserve the | |
3859 | values of last_command_exit_value, last_made_pid, and the_pipeline | |
3860 | around the execution of the trap commands. */ | |
3861 | trap_command = savestring (trap_list[SIGCHLD]); | |
3862 | ||
3863 | begin_unwind_frame ("SIGCHLD trap"); | |
3864 | unwind_protect_int (last_command_exit_value); | |
b80f6443 | 3865 | unwind_protect_int (last_command_exit_signal); |
f73dda09 | 3866 | unwind_protect_var (last_made_pid); |
28ef6c31 JA |
3867 | unwind_protect_int (interrupt_immediately); |
3868 | unwind_protect_int (jobs_list_frozen); | |
3869 | unwind_protect_pointer (the_pipeline); | |
3870 | unwind_protect_pointer (subst_assign_varlist); | |
4a741ca4 | 3871 | unwind_protect_pointer (this_shell_builtin); |
a0c0a00f | 3872 | unwind_protect_pointer (temporary_env); |
28ef6c31 JA |
3873 | |
3874 | /* We have to add the commands this way because they will be run | |
3875 | in reverse order of adding. We don't want maybe_set_sigchld_trap () | |
3876 | to reference freed memory. */ | |
b80f6443 JA |
3877 | add_unwind_protect (xfree, trap_command); |
3878 | add_unwind_protect (maybe_set_sigchld_trap, trap_command); | |
28ef6c31 JA |
3879 | |
3880 | subst_assign_varlist = (WORD_LIST *)NULL; | |
3881 | the_pipeline = (PROCESS *)NULL; | |
a0c0a00f | 3882 | temporary_env = 0; /* traps should not run with temporary env */ |
28ef6c31 | 3883 | |
ac50fbac CR |
3884 | running_trap = SIGCHLD + 1; |
3885 | ||
3185942a | 3886 | set_impossible_sigchld_trap (); |
28ef6c31 JA |
3887 | jobs_list_frozen = 1; |
3888 | for (i = 0; i < nchild; i++) | |
3889 | { | |
ac50fbac | 3890 | #if 0 |
28ef6c31 | 3891 | interrupt_immediately = 1; |
ac50fbac | 3892 | #endif |
b80f6443 | 3893 | parse_and_execute (savestring (trap_command), "trap", SEVAL_NOHIST|SEVAL_RESETLINE); |
28ef6c31 JA |
3894 | } |
3895 | ||
3896 | run_unwind_frame ("SIGCHLD trap"); | |
ac50fbac | 3897 | running_trap = 0; |
28ef6c31 JA |
3898 | } |
3899 | ||
726f6388 JA |
3900 | /* Function to call when you want to notify people of changes |
3901 | in job status. This prints out all jobs which are pending | |
3902 | notification to stderr, and marks those printed as already | |
3903 | notified, thus making them candidates for cleanup. */ | |
3904 | static void | |
3905 | notify_of_job_status () | |
3906 | { | |
3907 | register int job, termsig; | |
3908 | char *dir; | |
3909 | sigset_t set, oset; | |
ccc6cda3 | 3910 | WAIT s; |
726f6388 | 3911 | |
95732b49 | 3912 | if (jobs == 0 || js.j_jobslots == 0) |
28ef6c31 JA |
3913 | return; |
3914 | ||
7117c2d2 JA |
3915 | if (old_ttou != 0) |
3916 | { | |
3917 | sigemptyset (&set); | |
3918 | sigaddset (&set, SIGCHLD); | |
3919 | sigaddset (&set, SIGTTOU); | |
3920 | sigemptyset (&oset); | |
3921 | sigprocmask (SIG_BLOCK, &set, &oset); | |
3922 | } | |
3923 | else | |
3924 | queue_sigchld++; | |
726f6388 | 3925 | |
95732b49 JA |
3926 | /* XXX could use js.j_firstj here */ |
3927 | for (job = 0, dir = (char *)NULL; job < js.j_jobslots; job++) | |
726f6388 | 3928 | { |
ccc6cda3 | 3929 | if (jobs[job] && IS_NOTIFIED (job) == 0) |
726f6388 | 3930 | { |
bb70624e | 3931 | s = raw_job_exit_status (job); |
726f6388 JA |
3932 | termsig = WTERMSIG (s); |
3933 | ||
b72432fd JA |
3934 | /* POSIX.2 says we have to hang onto the statuses of at most the |
3935 | last CHILD_MAX background processes if the shell is running a | |
95732b49 JA |
3936 | script. If the shell is running a script, either from a file |
3937 | or standard input, don't print anything unless the job was | |
3938 | killed by a signal. */ | |
b72432fd JA |
3939 | if (startup_state == 0 && WIFSIGNALED (s) == 0 && |
3940 | ((DEADJOB (job) && IS_FOREGROUND (job) == 0) || STOPPED (job))) | |
3941 | continue; | |
3942 | ||
b80f6443 | 3943 | #if 0 |
726f6388 | 3944 | /* If job control is disabled, don't print the status messages. |
ccc6cda3 JA |
3945 | Mark dead jobs as notified so that they get cleaned up. If |
3946 | startup_state == 2, we were started to run `-c command', so | |
b72432fd JA |
3947 | don't print anything. */ |
3948 | if ((job_control == 0 && interactive_shell) || startup_state == 2) | |
b80f6443 JA |
3949 | #else |
3950 | /* If job control is disabled, don't print the status messages. | |
3951 | Mark dead jobs as notified so that they get cleaned up. If | |
3952 | startup_state == 2 and subshell_environment has the | |
3953 | SUBSHELL_COMSUB bit turned on, we were started to run a command | |
3954 | substitution, so don't print anything. */ | |
3955 | if ((job_control == 0 && interactive_shell) || | |
3956 | (startup_state == 2 && (subshell_environment & SUBSHELL_COMSUB))) | |
3957 | #endif | |
726f6388 | 3958 | { |
cce855bc JA |
3959 | /* POSIX.2 compatibility: if the shell is not interactive, |
3960 | hang onto the job corresponding to the last asynchronous | |
3961 | pid until the user has been notified of its status or does | |
3962 | a `wait'. */ | |
7117c2d2 | 3963 | if (DEADJOB (job) && (interactive_shell || (find_last_pid (job, 0) != last_asynchronous_pid))) |
726f6388 JA |
3964 | jobs[job]->flags |= J_NOTIFIED; |
3965 | continue; | |
3966 | } | |
3967 | ||
ccc6cda3 JA |
3968 | /* Print info on jobs that are running in the background, |
3969 | and on foreground jobs that were killed by anything | |
d166f048 | 3970 | except SIGINT (and possibly SIGPIPE). */ |
726f6388 JA |
3971 | switch (JOBSTATE (job)) |
3972 | { | |
726f6388 | 3973 | case JDEAD: |
ccc6cda3 | 3974 | if (interactive_shell == 0 && termsig && WIFSIGNALED (s) && |
cce855bc | 3975 | termsig != SIGINT && |
ac50fbac CR |
3976 | #if defined (DONT_REPORT_SIGTERM) |
3977 | termsig != SIGTERM && | |
3978 | #endif | |
cce855bc JA |
3979 | #if defined (DONT_REPORT_SIGPIPE) |
3980 | termsig != SIGPIPE && | |
3981 | #endif | |
ccc6cda3 | 3982 | signal_is_trapped (termsig) == 0) |
28ef6c31 | 3983 | { |
b80f6443 | 3984 | /* Don't print `0' for a line number. */ |
3185942a | 3985 | fprintf (stderr, _("%s: line %d: "), get_name_for_error (), (line_number == 0) ? 1 : line_number); |
ccc6cda3 JA |
3986 | pretty_print_job (job, JLIST_NONINTERACTIVE, stderr); |
3987 | } | |
3988 | else if (IS_FOREGROUND (job)) | |
726f6388 | 3989 | { |
d166f048 | 3990 | #if !defined (DONT_REPORT_SIGPIPE) |
726f6388 | 3991 | if (termsig && WIFSIGNALED (s) && termsig != SIGINT) |
d166f048 JA |
3992 | #else |
3993 | if (termsig && WIFSIGNALED (s) && termsig != SIGINT && termsig != SIGPIPE) | |
3994 | #endif | |
726f6388 | 3995 | { |
b80f6443 | 3996 | fprintf (stderr, "%s", j_strsignal (termsig)); |
726f6388 JA |
3997 | |
3998 | if (WIFCORED (s)) | |
3185942a | 3999 | fprintf (stderr, _(" (core dumped)")); |
726f6388 JA |
4000 | |
4001 | fprintf (stderr, "\n"); | |
4002 | } | |
4003 | } | |
95732b49 | 4004 | else if (job_control) /* XXX job control test added */ |
726f6388 | 4005 | { |
ccc6cda3 | 4006 | if (dir == 0) |
726f6388 | 4007 | dir = current_working_directory (); |
ccc6cda3 | 4008 | pretty_print_job (job, JLIST_STANDARD, stderr); |
726f6388 JA |
4009 | if (dir && strcmp (dir, jobs[job]->wd) != 0) |
4010 | fprintf (stderr, | |
3185942a | 4011 | _("(wd now: %s)\n"), polite_directory_format (dir)); |
726f6388 JA |
4012 | } |
4013 | ||
4014 | jobs[job]->flags |= J_NOTIFIED; | |
4015 | break; | |
4016 | ||
4017 | case JSTOPPED: | |
4018 | fprintf (stderr, "\n"); | |
ccc6cda3 | 4019 | if (dir == 0) |
726f6388 | 4020 | dir = current_working_directory (); |
ccc6cda3 | 4021 | pretty_print_job (job, JLIST_STANDARD, stderr); |
726f6388 JA |
4022 | if (dir && (strcmp (dir, jobs[job]->wd) != 0)) |
4023 | fprintf (stderr, | |
3185942a | 4024 | _("(wd now: %s)\n"), polite_directory_format (dir)); |
726f6388 JA |
4025 | jobs[job]->flags |= J_NOTIFIED; |
4026 | break; | |
4027 | ||
4028 | case JRUNNING: | |
4029 | case JMIXED: | |
4030 | break; | |
4031 | ||
4032 | default: | |
4033 | programming_error ("notify_of_job_status"); | |
4034 | } | |
4035 | } | |
4036 | } | |
7117c2d2 JA |
4037 | if (old_ttou != 0) |
4038 | sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); | |
4039 | else | |
4040 | queue_sigchld--; | |
726f6388 JA |
4041 | } |
4042 | ||
726f6388 | 4043 | /* Initialize the job control mechanism, and set up the tty stuff. */ |
ccc6cda3 | 4044 | int |
d166f048 JA |
4045 | initialize_job_control (force) |
4046 | int force; | |
726f6388 | 4047 | { |
3185942a JA |
4048 | pid_t t; |
4049 | int t_errno; | |
4050 | ||
4051 | t_errno = -1; | |
726f6388 JA |
4052 | shell_pgrp = getpgid (0); |
4053 | ||
4054 | if (shell_pgrp == -1) | |
4055 | { | |
3185942a | 4056 | sys_error (_("initialize_job_control: getpgrp failed")); |
726f6388 JA |
4057 | exit (1); |
4058 | } | |
4059 | ||
ac50fbac CR |
4060 | /* We can only have job control if we are interactive unless we force it. */ |
4061 | if (interactive == 0 && force == 0) | |
726f6388 JA |
4062 | { |
4063 | job_control = 0; | |
4064 | original_pgrp = NO_PID; | |
d166f048 | 4065 | shell_tty = fileno (stderr); |
a0c0a00f | 4066 | terminal_pgrp = tcgetpgrp (shell_tty); /* for checking later */ |
726f6388 JA |
4067 | } |
4068 | else | |
4069 | { | |
3185942a JA |
4070 | shell_tty = -1; |
4071 | ||
4072 | /* If forced_interactive is set, we skip the normal check that stderr | |
4073 | is attached to a tty, so we need to check here. If it's not, we | |
4074 | need to see whether we have a controlling tty by opening /dev/tty, | |
4075 | since trying to use job control tty pgrp manipulations on a non-tty | |
4076 | is going to fail. */ | |
4077 | if (forced_interactive && isatty (fileno (stderr)) == 0) | |
4078 | shell_tty = open ("/dev/tty", O_RDWR|O_NONBLOCK); | |
4079 | ||
726f6388 JA |
4080 | /* Get our controlling terminal. If job_control is set, or |
4081 | interactive is set, then this is an interactive shell no | |
ccc6cda3 | 4082 | matter where fd 2 is directed. */ |
3185942a JA |
4083 | if (shell_tty == -1) |
4084 | shell_tty = dup (fileno (stderr)); /* fd 2 */ | |
726f6388 | 4085 | |
ac50fbac CR |
4086 | if (shell_tty != -1) |
4087 | shell_tty = move_to_high_fd (shell_tty, 1, -1); | |
726f6388 | 4088 | |
726f6388 | 4089 | /* Compensate for a bug in systems that compiled the BSD |
ccc6cda3 | 4090 | rlogind with DEBUG defined, like NeXT and Alliant. */ |
726f6388 JA |
4091 | if (shell_pgrp == 0) |
4092 | { | |
4093 | shell_pgrp = getpid (); | |
4094 | setpgid (0, shell_pgrp); | |
a0c0a00f CR |
4095 | if (shell_tty != -1) |
4096 | tcsetpgrp (shell_tty, shell_pgrp); | |
726f6388 | 4097 | } |
726f6388 JA |
4098 | |
4099 | while ((terminal_pgrp = tcgetpgrp (shell_tty)) != -1) | |
4100 | { | |
4101 | if (shell_pgrp != terminal_pgrp) | |
4102 | { | |
7117c2d2 | 4103 | SigHandler *ottin; |
ccc6cda3 | 4104 | |
a0c0a00f | 4105 | ottin = set_signal_handler (SIGTTIN, SIG_DFL); |
726f6388 | 4106 | kill (0, SIGTTIN); |
7117c2d2 | 4107 | set_signal_handler (SIGTTIN, ottin); |
726f6388 JA |
4108 | continue; |
4109 | } | |
4110 | break; | |
4111 | } | |
4112 | ||
3185942a JA |
4113 | if (terminal_pgrp == -1) |
4114 | t_errno = errno; | |
4115 | ||
ccc6cda3 | 4116 | /* Make sure that we are using the new line discipline. */ |
726f6388 JA |
4117 | if (set_new_line_discipline (shell_tty) < 0) |
4118 | { | |
3185942a | 4119 | sys_error (_("initialize_job_control: line discipline")); |
726f6388 JA |
4120 | job_control = 0; |
4121 | } | |
4122 | else | |
4123 | { | |
4124 | original_pgrp = shell_pgrp; | |
4125 | shell_pgrp = getpid (); | |
4126 | ||
4127 | if ((original_pgrp != shell_pgrp) && (setpgid (0, shell_pgrp) < 0)) | |
4128 | { | |
3185942a | 4129 | sys_error (_("initialize_job_control: setpgid")); |
726f6388 JA |
4130 | shell_pgrp = original_pgrp; |
4131 | } | |
4132 | ||
4133 | job_control = 1; | |
ccc6cda3 JA |
4134 | |
4135 | /* If (and only if) we just set our process group to our pid, | |
4136 | thereby becoming a process group leader, and the terminal | |
4137 | is not in the same process group as our (new) process group, | |
4138 | then set the terminal's process group to our (new) process | |
4139 | group. If that fails, set our process group back to what it | |
4140 | was originally (so we can still read from the terminal) and | |
4141 | turn off job control. */ | |
4142 | if (shell_pgrp != original_pgrp && shell_pgrp != terminal_pgrp) | |
4143 | { | |
28ef6c31 | 4144 | if (give_terminal_to (shell_pgrp, 0) < 0) |
ccc6cda3 | 4145 | { |
3185942a | 4146 | t_errno = errno; |
28ef6c31 JA |
4147 | setpgid (0, original_pgrp); |
4148 | shell_pgrp = original_pgrp; | |
ac50fbac CR |
4149 | errno = t_errno; |
4150 | sys_error (_("cannot set terminal process group (%d)"), shell_pgrp); | |
28ef6c31 | 4151 | job_control = 0; |
ccc6cda3 JA |
4152 | } |
4153 | } | |
3185942a JA |
4154 | |
4155 | if (job_control && ((t = tcgetpgrp (shell_tty)) == -1 || t != shell_pgrp)) | |
4156 | { | |
4157 | if (t_errno != -1) | |
4158 | errno = t_errno; | |
4159 | sys_error (_("cannot set terminal process group (%d)"), t); | |
4160 | job_control = 0; | |
4161 | } | |
726f6388 JA |
4162 | } |
4163 | if (job_control == 0) | |
b80f6443 | 4164 | internal_error (_("no job control in this shell")); |
726f6388 JA |
4165 | } |
4166 | ||
a0c0a00f CR |
4167 | running_in_background = terminal_pgrp != shell_pgrp; |
4168 | ||
726f6388 JA |
4169 | if (shell_tty != fileno (stderr)) |
4170 | SET_CLOSE_ON_EXEC (shell_tty); | |
4171 | ||
ccc6cda3 | 4172 | set_signal_handler (SIGCHLD, sigchld_handler); |
726f6388 JA |
4173 | |
4174 | change_flag ('m', job_control ? '-' : '+'); | |
4175 | ||
4176 | if (interactive) | |
4177 | get_tty_state (); | |
ccc6cda3 | 4178 | |
95732b49 JA |
4179 | if (js.c_childmax < 0) |
4180 | js.c_childmax = getmaxchild (); | |
4181 | if (js.c_childmax < 0) | |
4182 | js.c_childmax = DEFAULT_CHILD_MAX; | |
4183 | ||
a0c0a00f CR |
4184 | #if 0 |
4185 | if (js.c_childmax > MAX_CHILD_MAX) | |
4186 | js.c_childmax = MAX_CHILD_MAX; | |
4187 | #endif | |
4188 | ||
726f6388 JA |
4189 | return job_control; |
4190 | } | |
4191 | ||
28ef6c31 JA |
4192 | #ifdef DEBUG |
4193 | void | |
4194 | debug_print_pgrps () | |
4195 | { | |
f73dda09 JA |
4196 | itrace("original_pgrp = %ld shell_pgrp = %ld terminal_pgrp = %ld", |
4197 | (long)original_pgrp, (long)shell_pgrp, (long)terminal_pgrp); | |
4198 | itrace("tcgetpgrp(%d) -> %ld, getpgid(0) -> %ld", | |
4199 | shell_tty, (long)tcgetpgrp (shell_tty), (long)getpgid(0)); | |
28ef6c31 JA |
4200 | } |
4201 | #endif | |
4202 | ||
726f6388 JA |
4203 | /* Set the line discipline to the best this system has to offer. |
4204 | Return -1 if this is not possible. */ | |
4205 | static int | |
4206 | set_new_line_discipline (tty) | |
4207 | int tty; | |
4208 | { | |
4209 | #if defined (NEW_TTY_DRIVER) | |
4210 | int ldisc; | |
4211 | ||
4212 | if (ioctl (tty, TIOCGETD, &ldisc) < 0) | |
4213 | return (-1); | |
4214 | ||
4215 | if (ldisc != NTTYDISC) | |
4216 | { | |
4217 | ldisc = NTTYDISC; | |
4218 | ||
4219 | if (ioctl (tty, TIOCSETD, &ldisc) < 0) | |
4220 | return (-1); | |
4221 | } | |
4222 | return (0); | |
4223 | #endif /* NEW_TTY_DRIVER */ | |
4224 | ||
4225 | #if defined (TERMIO_TTY_DRIVER) | |
ccc6cda3 | 4226 | # if defined (TERMIO_LDISC) && (NTTYDISC) |
726f6388 JA |
4227 | if (ioctl (tty, TCGETA, &shell_tty_info) < 0) |
4228 | return (-1); | |
4229 | ||
4230 | if (shell_tty_info.c_line != NTTYDISC) | |
4231 | { | |
4232 | shell_tty_info.c_line = NTTYDISC; | |
4233 | if (ioctl (tty, TCSETAW, &shell_tty_info) < 0) | |
4234 | return (-1); | |
4235 | } | |
ccc6cda3 | 4236 | # endif /* TERMIO_LDISC && NTTYDISC */ |
726f6388 JA |
4237 | return (0); |
4238 | #endif /* TERMIO_TTY_DRIVER */ | |
4239 | ||
4240 | #if defined (TERMIOS_TTY_DRIVER) | |
ccc6cda3 | 4241 | # if defined (TERMIOS_LDISC) && defined (NTTYDISC) |
726f6388 JA |
4242 | if (tcgetattr (tty, &shell_tty_info) < 0) |
4243 | return (-1); | |
4244 | ||
4245 | if (shell_tty_info.c_line != NTTYDISC) | |
4246 | { | |
4247 | shell_tty_info.c_line = NTTYDISC; | |
4248 | if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0) | |
4249 | return (-1); | |
4250 | } | |
ccc6cda3 | 4251 | # endif /* TERMIOS_LDISC && NTTYDISC */ |
726f6388 JA |
4252 | return (0); |
4253 | #endif /* TERMIOS_TTY_DRIVER */ | |
4254 | ||
4255 | #if !defined (NEW_TTY_DRIVER) && !defined (TERMIO_TTY_DRIVER) && !defined (TERMIOS_TTY_DRIVER) | |
4256 | return (-1); | |
4257 | #endif | |
4258 | } | |
4259 | ||
726f6388 JA |
4260 | /* Setup this shell to handle C-C, etc. */ |
4261 | void | |
4262 | initialize_job_signals () | |
4263 | { | |
4264 | if (interactive) | |
4265 | { | |
4266 | set_signal_handler (SIGINT, sigint_sighandler); | |
4267 | set_signal_handler (SIGTSTP, SIG_IGN); | |
4268 | set_signal_handler (SIGTTOU, SIG_IGN); | |
4269 | set_signal_handler (SIGTTIN, SIG_IGN); | |
726f6388 JA |
4270 | } |
4271 | else if (job_control) | |
4272 | { | |
28ef6c31 | 4273 | old_tstp = set_signal_handler (SIGTSTP, sigstop_sighandler); |
28ef6c31 | 4274 | old_ttin = set_signal_handler (SIGTTIN, sigstop_sighandler); |
7117c2d2 | 4275 | old_ttou = set_signal_handler (SIGTTOU, sigstop_sighandler); |
726f6388 | 4276 | } |
a0c0a00f | 4277 | /* Leave disposition unmodified for non-interactive shells without job |
726f6388 JA |
4278 | control. */ |
4279 | } | |
4280 | ||
4281 | /* Here we handle CONT signals. */ | |
4282 | static sighandler | |
28ef6c31 | 4283 | sigcont_sighandler (sig) |
726f6388 JA |
4284 | int sig; |
4285 | { | |
4286 | initialize_job_signals (); | |
4287 | set_signal_handler (SIGCONT, old_cont); | |
4288 | kill (getpid (), SIGCONT); | |
4289 | ||
ccc6cda3 | 4290 | SIGRETURN (0); |
726f6388 JA |
4291 | } |
4292 | ||
4293 | /* Here we handle stop signals while we are running not as a login shell. */ | |
4294 | static sighandler | |
28ef6c31 | 4295 | sigstop_sighandler (sig) |
726f6388 JA |
4296 | int sig; |
4297 | { | |
4298 | set_signal_handler (SIGTSTP, old_tstp); | |
4299 | set_signal_handler (SIGTTOU, old_ttou); | |
4300 | set_signal_handler (SIGTTIN, old_ttin); | |
4301 | ||
28ef6c31 | 4302 | old_cont = set_signal_handler (SIGCONT, sigcont_sighandler); |
726f6388 | 4303 | |
28ef6c31 | 4304 | give_terminal_to (shell_pgrp, 0); |
726f6388 JA |
4305 | |
4306 | kill (getpid (), sig); | |
4307 | ||
ccc6cda3 | 4308 | SIGRETURN (0); |
726f6388 JA |
4309 | } |
4310 | ||
4311 | /* Give the terminal to PGRP. */ | |
ccc6cda3 | 4312 | int |
28ef6c31 | 4313 | give_terminal_to (pgrp, force) |
726f6388 | 4314 | pid_t pgrp; |
28ef6c31 | 4315 | int force; |
726f6388 JA |
4316 | { |
4317 | sigset_t set, oset; | |
3185942a | 4318 | int r, e; |
726f6388 | 4319 | |
ccc6cda3 | 4320 | r = 0; |
28ef6c31 | 4321 | if (job_control || force) |
726f6388 JA |
4322 | { |
4323 | sigemptyset (&set); | |
4324 | sigaddset (&set, SIGTTOU); | |
4325 | sigaddset (&set, SIGTTIN); | |
4326 | sigaddset (&set, SIGTSTP); | |
4327 | sigaddset (&set, SIGCHLD); | |
4328 | sigemptyset (&oset); | |
4329 | sigprocmask (SIG_BLOCK, &set, &oset); | |
4330 | ||
4331 | if (tcsetpgrp (shell_tty, pgrp) < 0) | |
4332 | { | |
4333 | /* Maybe we should print an error message? */ | |
ccc6cda3 | 4334 | #if 0 |
f73dda09 JA |
4335 | sys_error ("tcsetpgrp(%d) failed: pid %ld to pgrp %ld", |
4336 | shell_tty, (long)getpid(), (long)pgrp); | |
ccc6cda3 | 4337 | #endif |
726f6388 | 4338 | r = -1; |
3185942a | 4339 | e = errno; |
726f6388 JA |
4340 | } |
4341 | else | |
4342 | terminal_pgrp = pgrp; | |
726f6388 JA |
4343 | sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); |
4344 | } | |
4345 | ||
3185942a JA |
4346 | if (r == -1) |
4347 | errno = e; | |
4348 | ||
726f6388 JA |
4349 | return r; |
4350 | } | |
4351 | ||
3185942a JA |
4352 | /* Give terminal to NPGRP iff it's currently owned by OPGRP. FLAGS are the |
4353 | flags to pass to give_terminal_to(). */ | |
4354 | static int | |
4355 | maybe_give_terminal_to (opgrp, npgrp, flags) | |
4356 | pid_t opgrp, npgrp; | |
4357 | int flags; | |
4358 | { | |
4359 | int tpgrp; | |
4360 | ||
4361 | tpgrp = tcgetpgrp (shell_tty); | |
4362 | if (tpgrp < 0 && errno == ENOTTY) | |
4363 | return -1; | |
4364 | if (tpgrp == npgrp) | |
4365 | { | |
4366 | terminal_pgrp = npgrp; | |
4367 | return 0; | |
4368 | } | |
4369 | else if (tpgrp != opgrp) | |
4370 | { | |
4371 | #if defined (DEBUG) | |
a0c0a00f | 4372 | internal_warning ("%d: maybe_give_terminal_to: terminal pgrp == %d shell pgrp = %d new pgrp = %d in_background = %d", (int)getpid(), tpgrp, opgrp, npgrp, running_in_background); |
3185942a JA |
4373 | #endif |
4374 | return -1; | |
4375 | } | |
4376 | else | |
4377 | return (give_terminal_to (npgrp, flags)); | |
4378 | } | |
4379 | ||
726f6388 JA |
4380 | /* Clear out any jobs in the job array. This is intended to be used by |
4381 | children of the shell, who should not have any job structures as baggage | |
4382 | when they start executing (forking subshells for parenthesized execution | |
cce855bc JA |
4383 | and functions with pipes are the two that spring to mind). If RUNNING_ONLY |
4384 | is nonzero, only running jobs are removed from the table. */ | |
d166f048 | 4385 | void |
cce855bc JA |
4386 | delete_all_jobs (running_only) |
4387 | int running_only; | |
726f6388 JA |
4388 | { |
4389 | register int i; | |
4390 | sigset_t set, oset; | |
4391 | ||
ccc6cda3 JA |
4392 | BLOCK_CHILD (set, oset); |
4393 | ||
95732b49 JA |
4394 | /* XXX - need to set j_lastj, j_firstj appropriately if running_only != 0. */ |
4395 | if (js.j_jobslots) | |
726f6388 | 4396 | { |
95732b49 | 4397 | js.j_current = js.j_previous = NO_JOB; |
726f6388 | 4398 | |
95732b49 JA |
4399 | /* XXX could use js.j_firstj here */ |
4400 | for (i = 0; i < js.j_jobslots; i++) | |
4401 | { | |
4402 | #if defined (DEBUG) | |
4403 | if (i < js.j_firstj && jobs[i]) | |
4404 | itrace("delete_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj); | |
0628567a JA |
4405 | if (i > js.j_lastj && jobs[i]) |
4406 | itrace("delete_all_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj); | |
95732b49 JA |
4407 | #endif |
4408 | if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i)))) | |
a0c0a00f CR |
4409 | /* We don't want to add any of these pids to bgpids. If running_only |
4410 | is non-zero, we don't want to add running jobs to the list. | |
4411 | If we are interested in all jobs, not just running jobs, and | |
4412 | we are going to clear the bgpids list below (bgp_clear()), we | |
4413 | don't need to bother. */ | |
4414 | delete_job (i, DEL_WARNSTOPPED|DEL_NOBGPID); | |
95732b49 | 4415 | } |
cce855bc JA |
4416 | if (running_only == 0) |
4417 | { | |
4418 | free ((char *)jobs); | |
95732b49 JA |
4419 | js.j_jobslots = 0; |
4420 | js.j_firstj = js.j_lastj = js.j_njobs = 0; | |
cce855bc | 4421 | } |
726f6388 | 4422 | } |
ccc6cda3 | 4423 | |
95732b49 JA |
4424 | if (running_only == 0) |
4425 | bgp_clear (); | |
4426 | ||
ccc6cda3 | 4427 | UNBLOCK_CHILD (oset); |
726f6388 JA |
4428 | } |
4429 | ||
d166f048 | 4430 | /* Mark all jobs in the job array so that they don't get a SIGHUP when the |
cce855bc | 4431 | shell gets one. If RUNNING_ONLY is nonzero, mark only running jobs. */ |
d166f048 | 4432 | void |
cce855bc JA |
4433 | nohup_all_jobs (running_only) |
4434 | int running_only; | |
d166f048 JA |
4435 | { |
4436 | register int i; | |
4437 | sigset_t set, oset; | |
4438 | ||
4439 | BLOCK_CHILD (set, oset); | |
4440 | ||
95732b49 | 4441 | if (js.j_jobslots) |
d166f048 | 4442 | { |
95732b49 JA |
4443 | /* XXX could use js.j_firstj here */ |
4444 | for (i = 0; i < js.j_jobslots; i++) | |
cce855bc | 4445 | if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i)))) |
d166f048 JA |
4446 | nohup_job (i); |
4447 | } | |
4448 | ||
4449 | UNBLOCK_CHILD (oset); | |
4450 | } | |
4451 | ||
bb70624e JA |
4452 | int |
4453 | count_all_jobs () | |
4454 | { | |
4455 | int i, n; | |
4456 | sigset_t set, oset; | |
4457 | ||
95732b49 | 4458 | /* This really counts all non-dead jobs. */ |
bb70624e | 4459 | BLOCK_CHILD (set, oset); |
95732b49 JA |
4460 | /* XXX could use js.j_firstj here */ |
4461 | for (i = n = 0; i < js.j_jobslots; i++) | |
4462 | { | |
4463 | #if defined (DEBUG) | |
4464 | if (i < js.j_firstj && jobs[i]) | |
4465 | itrace("count_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj); | |
0628567a JA |
4466 | if (i > js.j_lastj && jobs[i]) |
4467 | itrace("count_all_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj); | |
95732b49 JA |
4468 | #endif |
4469 | if (jobs[i] && DEADJOB(i) == 0) | |
4470 | n++; | |
4471 | } | |
bb70624e JA |
4472 | UNBLOCK_CHILD (oset); |
4473 | return n; | |
4474 | } | |
4475 | ||
4476 | static void | |
4477 | mark_all_jobs_as_dead () | |
4478 | { | |
4479 | register int i; | |
4480 | sigset_t set, oset; | |
4481 | ||
95732b49 | 4482 | if (js.j_jobslots == 0) |
7117c2d2 | 4483 | return; |
bb70624e | 4484 | |
7117c2d2 | 4485 | BLOCK_CHILD (set, oset); |
bb70624e | 4486 | |
95732b49 JA |
4487 | /* XXX could use js.j_firstj here */ |
4488 | for (i = 0; i < js.j_jobslots; i++) | |
7117c2d2 | 4489 | if (jobs[i]) |
95732b49 JA |
4490 | { |
4491 | jobs[i]->state = JDEAD; | |
4492 | js.j_ndead++; | |
4493 | } | |
7117c2d2 JA |
4494 | |
4495 | UNBLOCK_CHILD (oset); | |
bb70624e JA |
4496 | } |
4497 | ||
726f6388 | 4498 | /* Mark all dead jobs as notified, so delete_job () cleans them out |
b72432fd JA |
4499 | of the job table properly. POSIX.2 says we need to save the |
4500 | status of the last CHILD_MAX jobs, so we count the number of dead | |
4501 | jobs and mark only enough as notified to save CHILD_MAX statuses. */ | |
726f6388 | 4502 | static void |
b72432fd JA |
4503 | mark_dead_jobs_as_notified (force) |
4504 | int force; | |
726f6388 | 4505 | { |
95732b49 | 4506 | register int i, ndead, ndeadproc; |
726f6388 JA |
4507 | sigset_t set, oset; |
4508 | ||
95732b49 | 4509 | if (js.j_jobslots == 0) |
7117c2d2 | 4510 | return; |
b72432fd | 4511 | |
7117c2d2 | 4512 | BLOCK_CHILD (set, oset); |
b72432fd | 4513 | |
7117c2d2 JA |
4514 | /* If FORCE is non-zero, we don't have to keep CHILD_MAX statuses |
4515 | around; just run through the array. */ | |
4516 | if (force) | |
4517 | { | |
95732b49 JA |
4518 | /* XXX could use js.j_firstj here */ |
4519 | for (i = 0; i < js.j_jobslots; i++) | |
28ef6c31 | 4520 | { |
7117c2d2 JA |
4521 | if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid))) |
4522 | jobs[i]->flags |= J_NOTIFIED; | |
28ef6c31 | 4523 | } |
7117c2d2 JA |
4524 | UNBLOCK_CHILD (oset); |
4525 | return; | |
4526 | } | |
4527 | ||
95732b49 JA |
4528 | /* Mark enough dead jobs as notified to keep CHILD_MAX processes left in the |
4529 | array with the corresponding not marked as notified. This is a better | |
4530 | way to avoid pid aliasing and reuse problems than keeping the POSIX- | |
4531 | mandated CHILD_MAX jobs around. delete_job() takes care of keeping the | |
4532 | bgpids list regulated. */ | |
7117c2d2 JA |
4533 | |
4534 | /* Count the number of dead jobs */ | |
95732b49 JA |
4535 | /* XXX could use js.j_firstj here */ |
4536 | for (i = ndead = ndeadproc = 0; i < js.j_jobslots; i++) | |
7117c2d2 | 4537 | { |
95732b49 JA |
4538 | #if defined (DEBUG) |
4539 | if (i < js.j_firstj && jobs[i]) | |
4540 | itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj); | |
0628567a JA |
4541 | if (i > js.j_lastj && jobs[i]) |
4542 | itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i, js.j_lastj); | |
95732b49 | 4543 | #endif |
7117c2d2 | 4544 | if (jobs[i] && DEADJOB (i)) |
95732b49 JA |
4545 | { |
4546 | ndead++; | |
4547 | ndeadproc += processes_in_job (i); | |
4548 | } | |
7117c2d2 JA |
4549 | } |
4550 | ||
95732b49 | 4551 | #ifdef DEBUG |
ac50fbac | 4552 | # if 0 |
95732b49 JA |
4553 | if (ndeadproc != js.c_reaped) |
4554 | itrace("mark_dead_jobs_as_notified: ndeadproc (%d) != js.c_reaped (%d)", ndeadproc, js.c_reaped); | |
ac50fbac | 4555 | # endif |
95732b49 JA |
4556 | if (ndead != js.j_ndead) |
4557 | itrace("mark_dead_jobs_as_notified: ndead (%d) != js.j_ndead (%d)", ndead, js.j_ndead); | |
4558 | #endif | |
4559 | ||
4560 | if (js.c_childmax < 0) | |
4561 | js.c_childmax = getmaxchild (); | |
4562 | if (js.c_childmax < 0) | |
4563 | js.c_childmax = DEFAULT_CHILD_MAX; | |
726f6388 | 4564 | |
a0c0a00f CR |
4565 | #if 0 |
4566 | if (js.c_childmax > MAX_CHILD_MAX) | |
4567 | js.c_childmax = MAX_CHILD_MAX; | |
4568 | #endif | |
4569 | ||
95732b49 JA |
4570 | /* Don't do anything if the number of dead processes is less than CHILD_MAX |
4571 | and we're not forcing a cleanup. */ | |
4572 | if (ndeadproc <= js.c_childmax) | |
7117c2d2 | 4573 | { |
726f6388 | 4574 | UNBLOCK_CHILD (oset); |
7117c2d2 | 4575 | return; |
726f6388 | 4576 | } |
7117c2d2 | 4577 | |
95732b49 JA |
4578 | #if 0 |
4579 | itrace("mark_dead_jobs_as_notified: child_max = %d ndead = %d ndeadproc = %d", js.c_childmax, ndead, ndeadproc); | |
4580 | #endif | |
4581 | ||
7117c2d2 JA |
4582 | /* Mark enough dead jobs as notified that we keep CHILD_MAX jobs in |
4583 | the list. This isn't exactly right yet; changes need to be made | |
4584 | to stop_pipeline so we don't mark the newer jobs after we've | |
95732b49 JA |
4585 | created CHILD_MAX slots in the jobs array. This needs to be |
4586 | integrated with a way to keep the jobs array from growing without | |
4587 | bound. Maybe we wrap back around to 0 after we reach some max | |
4588 | limit, and there are sufficient job slots free (keep track of total | |
4589 | size of jobs array (js.j_jobslots) and running count of number of jobs | |
4590 | in jobs array. Then keep a job index corresponding to the `oldest job' | |
4591 | and start this loop there, wrapping around as necessary. In effect, | |
4592 | we turn the list into a circular buffer. */ | |
4593 | /* XXX could use js.j_firstj here */ | |
4594 | for (i = 0; i < js.j_jobslots; i++) | |
7117c2d2 JA |
4595 | { |
4596 | if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid))) | |
4597 | { | |
95732b49 JA |
4598 | #if defined (DEBUG) |
4599 | if (i < js.j_firstj && jobs[i]) | |
4600 | itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj); | |
0628567a JA |
4601 | if (i > js.j_lastj && jobs[i]) |
4602 | itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i, js.j_lastj); | |
95732b49 JA |
4603 | #endif |
4604 | /* If marking this job as notified would drop us down below | |
4605 | child_max, don't mark it so we can keep at least child_max | |
4606 | statuses. XXX -- need to check what Posix actually says | |
4607 | about keeping statuses. */ | |
4608 | if ((ndeadproc -= processes_in_job (i)) <= js.c_childmax) | |
7117c2d2 | 4609 | break; |
95732b49 | 4610 | jobs[i]->flags |= J_NOTIFIED; |
7117c2d2 JA |
4611 | } |
4612 | } | |
4613 | ||
4614 | UNBLOCK_CHILD (oset); | |
726f6388 JA |
4615 | } |
4616 | ||
ccc6cda3 | 4617 | /* Here to allow other parts of the shell (like the trap stuff) to |
495aee44 | 4618 | freeze and unfreeze the jobs list. */ |
a0c0a00f | 4619 | int |
495aee44 CR |
4620 | freeze_jobs_list () |
4621 | { | |
a0c0a00f CR |
4622 | int o; |
4623 | ||
4624 | o = jobs_list_frozen; | |
495aee44 | 4625 | jobs_list_frozen = 1; |
a0c0a00f | 4626 | return o; |
495aee44 CR |
4627 | } |
4628 | ||
ccc6cda3 JA |
4629 | void |
4630 | unfreeze_jobs_list () | |
4631 | { | |
4632 | jobs_list_frozen = 0; | |
4633 | } | |
4634 | ||
726f6388 JA |
4635 | /* Allow or disallow job control to take place. Returns the old value |
4636 | of job_control. */ | |
4637 | int | |
4638 | set_job_control (arg) | |
4639 | int arg; | |
4640 | { | |
4641 | int old; | |
4642 | ||
4643 | old = job_control; | |
4644 | job_control = arg; | |
b80f6443 | 4645 | |
a0c0a00f CR |
4646 | if (terminal_pgrp == NO_PID) |
4647 | terminal_pgrp = tcgetpgrp (shell_tty); | |
4648 | ||
4649 | running_in_background = (terminal_pgrp != shell_pgrp); | |
4650 | ||
4651 | #if 0 | |
4652 | if (interactive_shell == 0 && running_in_background == 0 && job_control != old) | |
4653 | { | |
4654 | if (job_control) | |
4655 | initialize_job_signals (); | |
4656 | else | |
4657 | default_tty_job_signals (); | |
4658 | } | |
4659 | #endif | |
4660 | ||
b80f6443 JA |
4661 | /* If we're turning on job control, reset pipeline_pgrp so make_child will |
4662 | put new child processes into the right pgrp */ | |
4663 | if (job_control != old && job_control) | |
4664 | pipeline_pgrp = 0; | |
4665 | ||
726f6388 JA |
4666 | return (old); |
4667 | } | |
4668 | ||
4669 | /* Turn off all traces of job control. This is run by children of the shell | |
4670 | which are going to do shellsy things, like wait (), etc. */ | |
4671 | void | |
4672 | without_job_control () | |
4673 | { | |
4674 | stop_making_children (); | |
4675 | start_pipeline (); | |
95732b49 | 4676 | #if defined (PGRP_PIPE) |
3185942a | 4677 | sh_closepipe (pgrp_pipe); |
95732b49 | 4678 | #endif |
cce855bc | 4679 | delete_all_jobs (0); |
726f6388 JA |
4680 | set_job_control (0); |
4681 | } | |
4682 | ||
4683 | /* If this shell is interactive, terminate all stopped jobs and | |
4684 | restore the original terminal process group. This is done | |
4685 | before the `exec' builtin calls shell_execve. */ | |
4686 | void | |
4687 | end_job_control () | |
4688 | { | |
22205f43 | 4689 | if (interactive_shell || job_control) /* XXX - should it be just job_control? */ |
726f6388 JA |
4690 | { |
4691 | terminate_stopped_jobs (); | |
4692 | ||
4693 | if (original_pgrp >= 0) | |
28ef6c31 | 4694 | give_terminal_to (original_pgrp, 1); |
726f6388 JA |
4695 | } |
4696 | ||
4697 | if (original_pgrp >= 0) | |
4698 | setpgid (0, original_pgrp); | |
4699 | } | |
4700 | ||
4701 | /* Restart job control by closing shell tty and reinitializing. This is | |
4702 | called after an exec fails in an interactive shell and we do not exit. */ | |
4703 | void | |
4704 | restart_job_control () | |
4705 | { | |
4706 | if (shell_tty != -1) | |
4707 | close (shell_tty); | |
d166f048 | 4708 | initialize_job_control (0); |
726f6388 JA |
4709 | } |
4710 | ||
ac50fbac CR |
4711 | void |
4712 | set_maxchild (nchild) | |
4713 | int nchild; | |
4714 | { | |
4715 | static int lmaxchild = -1; | |
4716 | ||
4717 | if (lmaxchild < 0) | |
4718 | lmaxchild = getmaxchild (); | |
4719 | if (lmaxchild < 0) | |
4720 | lmaxchild = DEFAULT_CHILD_MAX; | |
4721 | ||
4722 | /* Clamp value we set. Minimum is what Posix requires, maximum is defined | |
4723 | above as MAX_CHILD_MAX. */ | |
4724 | if (nchild < lmaxchild) | |
4725 | nchild = lmaxchild; | |
4726 | else if (nchild > MAX_CHILD_MAX) | |
4727 | nchild = MAX_CHILD_MAX; | |
4728 | ||
4729 | js.c_childmax = nchild; | |
4730 | } | |
4731 | ||
726f6388 JA |
4732 | /* Set the handler to run when the shell receives a SIGCHLD signal. */ |
4733 | void | |
4734 | set_sigchld_handler () | |
4735 | { | |
ccc6cda3 | 4736 | set_signal_handler (SIGCHLD, sigchld_handler); |
726f6388 JA |
4737 | } |
4738 | ||
4739 | #if defined (PGRP_PIPE) | |
4740 | /* Read from the read end of a pipe. This is how the process group leader | |
4741 | blocks until all of the processes in a pipeline have been made. */ | |
4742 | static void | |
4743 | pipe_read (pp) | |
4744 | int *pp; | |
4745 | { | |
4746 | char ch; | |
4747 | ||
4748 | if (pp[1] >= 0) | |
4749 | { | |
4750 | close (pp[1]); | |
4751 | pp[1] = -1; | |
4752 | } | |
4753 | ||
4754 | if (pp[0] >= 0) | |
4755 | { | |
4756 | while (read (pp[0], &ch, 1) == -1 && errno == EINTR) | |
bb70624e | 4757 | ; |
726f6388 JA |
4758 | } |
4759 | } | |
4760 | ||
726f6388 | 4761 | /* Functional interface closes our local-to-job-control pipes. */ |
ccc6cda3 | 4762 | void |
726f6388 JA |
4763 | close_pgrp_pipe () |
4764 | { | |
3185942a | 4765 | sh_closepipe (pgrp_pipe); |
726f6388 JA |
4766 | } |
4767 | ||
89a92869 CR |
4768 | void |
4769 | save_pgrp_pipe (p, clear) | |
4770 | int *p; | |
4771 | int clear; | |
4772 | { | |
4773 | p[0] = pgrp_pipe[0]; | |
4774 | p[1] = pgrp_pipe[1]; | |
4775 | if (clear) | |
4776 | pgrp_pipe[0] = pgrp_pipe[1] = -1; | |
4777 | } | |
4778 | ||
4779 | void | |
4780 | restore_pgrp_pipe (p) | |
4781 | int *p; | |
4782 | { | |
4783 | pgrp_pipe[0] = p[0]; | |
4784 | pgrp_pipe[1] = p[1]; | |
4785 | } | |
4786 | ||
726f6388 | 4787 | #endif /* PGRP_PIPE */ |