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Commit | Line | Data |
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726f6388 JA |
1 | /* The thing that makes children, remembers them, and contains wait loops. */ |
2 | ||
ccc6cda3 JA |
3 | /* This file works with both POSIX and BSD systems. It implements job |
4 | control. */ | |
726f6388 JA |
5 | |
6 | /* Copyright (C) 1989, 1992 Free Software Foundation, Inc. | |
7 | ||
8 | This file is part of GNU Bash, the Bourne Again SHell. | |
9 | ||
10 | Bash is free software; you can redistribute it and/or modify it under | |
11 | the terms of the GNU General Public License as published by the Free | |
12 | Software Foundation; either version 1, or (at your option) any later | |
13 | version. | |
14 | ||
15 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
16 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
17 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
18 | for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License along | |
21 | with Bash; see the file COPYING. If not, write to the Free Software | |
22 | Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
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 | |
ccc6cda3 JA |
36 | #if defined (HAVE_SYS_TIME_H) |
37 | # include <sys/time.h> | |
38 | #endif | |
39 | ||
40 | #if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_WAIT3) && !defined (_POSIX_VERSION) | |
41 | # include <sys/resource.h> | |
42 | #endif /* !_POSIX_VERSION && HAVE_SYS_RESOURCE_H && HAVE_WAIT3 */ | |
726f6388 JA |
43 | |
44 | #include <sys/file.h> | |
45 | #include "filecntl.h" | |
46 | #include <sys/ioctl.h> | |
47 | #include <sys/param.h> | |
48 | ||
49 | #if defined (BUFFERED_INPUT) | |
50 | # include "input.h" | |
51 | #endif | |
52 | ||
ccc6cda3 JA |
53 | /* Need to include this up here for *_TTY_DRIVER definitions. */ |
54 | #include "bashtty.h" | |
726f6388 JA |
55 | |
56 | /* Define this if your output is getting swallowed. It's a no-op on | |
57 | machines with the termio or termios tty drivers. */ | |
58 | /* #define DRAIN_OUTPUT */ | |
59 | ||
ccc6cda3 JA |
60 | /* The _POSIX_SOURCE define is to avoid multiple symbol definitions |
61 | between sys/ioctl.h and termios.h. Ditto for the test against SunOS4 | |
62 | and the undefining of several symbols. */ | |
63 | #if defined (TERMIOS_TTY_DRIVER) | |
64 | # if (defined (SunOS4) || defined (SunOS5)) && !defined (_POSIX_SOURCE) | |
726f6388 JA |
65 | # define _POSIX_SOURCE |
66 | # endif | |
726f6388 JA |
67 | # if defined (SunOS4) |
68 | # undef ECHO | |
69 | # undef NOFLSH | |
70 | # undef TOSTOP | |
71 | # endif /* SunOS4 */ | |
72 | # include <termios.h> | |
ccc6cda3 JA |
73 | #else /* !TERMIOS_TTY_DRIVER */ |
74 | # if defined (TERMIO_TTY_DRIVER) | |
75 | # include <termio.h> | |
76 | # else | |
77 | # include <sgtty.h> | |
78 | # endif | |
79 | #endif /* !TERMIOS_TTY_DRIVER */ | |
726f6388 JA |
80 | |
81 | /* For the TIOCGPGRP and TIOCSPGRP ioctl parameters on HP-UX */ | |
726f6388 JA |
82 | #if defined (hpux) && !defined (TERMIOS_TTY_DRIVER) |
83 | # include <bsdtty.h> | |
84 | #endif /* hpux && !TERMIOS_TTY_DRIVER */ | |
85 | ||
ccc6cda3 JA |
86 | /* For struct winsize on SCO */ |
87 | /* sys/ptem.h has winsize but needs mblk_t from sys/stream.h */ | |
88 | #if defined (HAVE_SYS_PTEM_H) && defined (TIOCGWINSZ) && defined (SIGWINCH) | |
89 | # if defined (HAVE_SYS_STREAM_H) | |
90 | # include <sys/stream.h> | |
91 | # endif | |
92 | # include <sys/ptem.h> | |
93 | #endif | |
94 | ||
726f6388 JA |
95 | #include "bashansi.h" |
96 | #include "shell.h" | |
97 | #include "jobs.h" | |
ccc6cda3 JA |
98 | #include "flags.h" |
99 | #include "error.h" | |
726f6388 JA |
100 | |
101 | #include "builtins/builtext.h" | |
102 | #include "builtins/common.h" | |
103 | ||
726f6388 JA |
104 | #if !defined (errno) |
105 | extern int errno; | |
106 | #endif /* !errno */ | |
107 | ||
ccc6cda3 JA |
108 | /* Take care of system dependencies that must be handled when waiting for |
109 | children. The arguments to the WAITPID macro match those to the Posix.1 | |
110 | waitpid() function. */ | |
111 | ||
112 | #if defined (ultrix) && defined (mips) && defined (_POSIX_VERSION) | |
113 | # define WAITPID(pid, statusp, options) \ | |
114 | wait3 ((union wait *)statusp, options, (struct rusage *)0) | |
115 | #else | |
116 | # if defined (_POSIX_VERSION) || defined (HAVE_WAITPID) | |
117 | # define WAITPID(pid, statusp, options) \ | |
118 | waitpid ((pid_t)pid, statusp, options) | |
119 | # else | |
120 | # if defined (HAVE_WAIT3) | |
121 | # define WAITPID(pid, statusp, options) \ | |
122 | wait3 (statusp, options, (struct rusage *)0) | |
123 | # else | |
124 | # define WAITPID(pid, statusp, options) \ | |
125 | wait3 (statusp, options, (int *)0) | |
126 | # endif /* HAVE_WAIT3 */ | |
127 | # endif /* !_POSIX_VERSION && !HAVE_WAITPID*/ | |
128 | #endif /* !(Ultrix && mips && _POSIX_VERSION) */ | |
129 | ||
130 | /* getpgrp () varies between systems. Even systems that claim to be | |
131 | Posix.1 compatible lie sometimes (Ultrix, SunOS4, apollo). */ | |
132 | #if defined (GETPGRP_VOID) | |
133 | # define getpgid(p) getpgrp () | |
134 | #else | |
135 | # define getpgid(p) getpgrp (p) | |
136 | #endif /* !GETPGRP_VOID */ | |
137 | ||
138 | /* If the system needs it, REINSTALL_SIGCHLD_HANDLER will reinstall the | |
139 | handler for SIGCHLD. */ | |
140 | #if defined (MUST_REINSTALL_SIGHANDLERS) | |
141 | # define REINSTALL_SIGCHLD_HANDLER signal (SIGCHLD, sigchld_handler) | |
142 | #else | |
143 | # define REINSTALL_SIGCHLD_HANDLER | |
144 | #endif /* !MUST_REINSTALL_SIGHANDLERS */ | |
145 | ||
146 | /* The number of additional slots to allocate when we run out. */ | |
147 | #define JOB_SLOTS 8 | |
148 | ||
726f6388 JA |
149 | /* Variables used here but defined in other files. */ |
150 | extern int interactive, interactive_shell, asynchronous_notification; | |
ccc6cda3 | 151 | extern int startup_state, subshell_environment, line_number; |
726f6388 JA |
152 | extern int posixly_correct, no_symbolic_links, shell_level; |
153 | extern int interrupt_immediately, last_command_exit_value; | |
154 | extern int loop_level, breaking; | |
155 | extern Function *this_shell_builtin; | |
156 | extern char *shell_name, *this_command_name; | |
157 | extern sigset_t top_level_mask; | |
158 | ||
ccc6cda3 JA |
159 | #if defined (ARRAY_VARS) |
160 | static int *pstatuses; /* list of pipeline statuses */ | |
161 | static int statsize; | |
162 | static void set_pipestatus_array (); | |
163 | #endif | |
164 | static void setjstatus (); | |
165 | static void get_new_window_size (); | |
166 | ||
726f6388 JA |
167 | /* The array of known jobs. */ |
168 | JOB **jobs = (JOB **)NULL; | |
169 | ||
170 | /* The number of slots currently allocated to JOBS. */ | |
171 | int job_slots = 0; | |
172 | ||
726f6388 JA |
173 | /* The controlling tty for this shell. */ |
174 | int shell_tty = -1; | |
175 | ||
176 | /* The shell's process group. */ | |
177 | pid_t shell_pgrp = NO_PID; | |
178 | ||
179 | /* The terminal's process group. */ | |
180 | pid_t terminal_pgrp = NO_PID; | |
181 | ||
182 | /* The process group of the shell's parent. */ | |
183 | pid_t original_pgrp = NO_PID; | |
184 | ||
185 | /* The process group of the pipeline currently being made. */ | |
186 | pid_t pipeline_pgrp = (pid_t)0; | |
187 | ||
188 | #if defined (PGRP_PIPE) | |
189 | /* Pipes which each shell uses to communicate with the process group leader | |
190 | until all of the processes in a pipeline have been started. Then the | |
191 | process leader is allowed to continue. */ | |
192 | int pgrp_pipe[2] = { -1, -1 }; | |
193 | #endif | |
ccc6cda3 | 194 | |
726f6388 JA |
195 | /* The job which is current; i.e. the one that `%+' stands for. */ |
196 | int current_job = NO_JOB; | |
197 | ||
198 | /* The previous job; i.e. the one that `%-' stands for. */ | |
199 | int previous_job = NO_JOB; | |
200 | ||
201 | /* Last child made by the shell. */ | |
202 | pid_t last_made_pid = NO_PID; | |
203 | ||
204 | /* Pid of the last asynchronous child. */ | |
205 | pid_t last_asynchronous_pid = NO_PID; | |
206 | ||
207 | /* The pipeline currently being built. */ | |
208 | PROCESS *the_pipeline = (PROCESS *)NULL; | |
209 | ||
210 | /* If this is non-zero, do job control. */ | |
211 | int job_control = 1; | |
212 | ||
213 | /* Call this when you start making children. */ | |
214 | int already_making_children = 0; | |
215 | ||
ccc6cda3 JA |
216 | /* If this is non-zero, $LINES and $COLUMNS are reset after every process |
217 | exits from get_tty_state(). */ | |
218 | int check_window_size; | |
219 | ||
726f6388 | 220 | /* Functions local to this file. */ |
ccc6cda3 JA |
221 | static sighandler sigchld_handler (); |
222 | static int waitchld (); | |
726f6388 JA |
223 | static PROCESS *find_pipeline (); |
224 | static char *current_working_directory (); | |
225 | static char *job_working_directory (); | |
226 | static pid_t last_pid (); | |
227 | static int set_new_line_discipline (), map_over_jobs (), last_running_job (); | |
228 | static int most_recent_job_in_state (), last_stopped_job (), find_job (); | |
229 | static void notify_of_job_status (), cleanup_dead_jobs (), discard_pipeline (); | |
230 | static void add_process (), set_current_job (), reset_current (); | |
ccc6cda3 | 231 | static void print_pipeline (); |
726f6388 JA |
232 | static void pretty_print_job (); |
233 | static void mark_dead_jobs_as_notified (); | |
234 | #if defined (PGRP_PIPE) | |
235 | static void pipe_read (), pipe_close (); | |
236 | #endif | |
237 | ||
ccc6cda3 JA |
238 | /* Used to synchronize between wait_for and the SIGCHLD signal handler. */ |
239 | static int sigchld; | |
240 | static int waiting_for_job; | |
241 | ||
242 | /* A place to temporarily save the current pipeline. */ | |
243 | static PROCESS *saved_pipeline; | |
244 | static int saved_already_making_children; | |
726f6388 JA |
245 | |
246 | /* Set this to non-zero whenever you don't want the jobs list to change at | |
247 | all: no jobs deleted and no status change notifications. This is used, | |
248 | for example, when executing SIGCHLD traps, which may run arbitrary | |
249 | commands. */ | |
ccc6cda3 | 250 | static int jobs_list_frozen; |
726f6388 JA |
251 | |
252 | #if !defined (_POSIX_VERSION) | |
253 | ||
254 | /* These are definitions to map POSIX 1003.1 functions onto existing BSD | |
255 | library functions and system calls. */ | |
256 | #define setpgid(pid, pgrp) setpgrp (pid, pgrp) | |
257 | #define tcsetpgrp(fd, pgrp) ioctl ((fd), TIOCSPGRP, &(pgrp)) | |
258 | ||
259 | pid_t | |
260 | tcgetpgrp (fd) | |
261 | int fd; | |
262 | { | |
263 | pid_t pgrp; | |
264 | ||
265 | /* ioctl will handle setting errno correctly. */ | |
266 | if (ioctl (fd, TIOCGPGRP, &pgrp) < 0) | |
267 | return (-1); | |
268 | return (pgrp); | |
269 | } | |
270 | ||
726f6388 JA |
271 | #endif /* !_POSIX_VERSION */ |
272 | ||
273 | /* Return the working directory for the current process. Unlike | |
274 | job_working_directory, this does not call malloc (), nor do any | |
275 | of the functions it calls. This is so that it can safely be called | |
276 | from a signal handler. */ | |
277 | static char * | |
278 | current_working_directory () | |
279 | { | |
280 | char *dir; | |
ccc6cda3 | 281 | static char d[PATH_MAX]; |
726f6388 JA |
282 | |
283 | dir = get_string_value ("PWD"); | |
284 | ||
ccc6cda3 | 285 | if (dir == 0 && the_current_working_directory && no_symbolic_links) |
726f6388 JA |
286 | dir = the_current_working_directory; |
287 | ||
ccc6cda3 | 288 | if (dir == 0) |
726f6388 | 289 | { |
ccc6cda3 | 290 | dir = getcwd (d, sizeof(d)); |
726f6388 JA |
291 | if (dir) |
292 | dir = d; | |
293 | } | |
294 | ||
ccc6cda3 | 295 | return (dir == 0) ? "<unknown>" : dir; |
726f6388 JA |
296 | } |
297 | ||
298 | /* Return the working directory for the current process. */ | |
299 | static char * | |
300 | job_working_directory () | |
301 | { | |
302 | char *dir; | |
303 | ||
304 | dir = get_string_value ("PWD"); | |
305 | if (dir) | |
306 | return (savestring (dir)); | |
307 | ||
308 | dir = get_working_directory ("job-working-directory"); | |
309 | if (dir) | |
310 | return (dir); | |
311 | ||
312 | return (savestring ("<unknown>")); | |
313 | } | |
314 | ||
315 | void | |
316 | making_children () | |
317 | { | |
318 | if (already_making_children) | |
319 | return; | |
320 | ||
321 | already_making_children = 1; | |
322 | start_pipeline (); | |
323 | } | |
324 | ||
325 | void | |
326 | stop_making_children () | |
327 | { | |
328 | already_making_children = 0; | |
329 | } | |
330 | ||
331 | void | |
332 | cleanup_the_pipeline () | |
333 | { | |
334 | if (the_pipeline) | |
335 | { | |
336 | discard_pipeline (the_pipeline); | |
337 | the_pipeline = (PROCESS *)NULL; | |
338 | } | |
339 | } | |
340 | ||
ccc6cda3 JA |
341 | void |
342 | save_pipeline (clear) | |
343 | int clear; | |
344 | { | |
345 | saved_pipeline = the_pipeline; | |
346 | saved_already_making_children = already_making_children; | |
347 | if (clear) | |
348 | the_pipeline = (PROCESS *)NULL; | |
349 | } | |
350 | ||
351 | void | |
352 | restore_pipeline (discard) | |
353 | int discard; | |
354 | { | |
355 | PROCESS *old_pipeline; | |
356 | ||
357 | old_pipeline = the_pipeline; | |
358 | the_pipeline = saved_pipeline; | |
359 | already_making_children = saved_already_making_children; | |
360 | if (discard) | |
361 | discard_pipeline (old_pipeline); | |
362 | } | |
363 | ||
726f6388 JA |
364 | /* Start building a pipeline. */ |
365 | void | |
366 | start_pipeline () | |
367 | { | |
368 | if (the_pipeline) | |
369 | { | |
ccc6cda3 | 370 | cleanup_the_pipeline (); |
726f6388 JA |
371 | pipeline_pgrp = 0; |
372 | #if defined (PGRP_PIPE) | |
373 | pipe_close (pgrp_pipe); | |
374 | #endif | |
375 | } | |
376 | ||
377 | #if defined (PGRP_PIPE) | |
378 | if (job_control) | |
379 | { | |
380 | if (pipe (pgrp_pipe) == -1) | |
ccc6cda3 | 381 | sys_error ("start_pipeline: pgrp pipe"); |
726f6388 JA |
382 | } |
383 | #endif | |
384 | } | |
385 | ||
386 | /* Stop building a pipeline. Install the process list in the job array. | |
387 | This returns the index of the newly installed job. | |
388 | DEFERRED is a command structure to be executed upon satisfactory | |
389 | execution exit of this pipeline. */ | |
390 | int | |
391 | stop_pipeline (async, deferred) | |
392 | int async; | |
393 | COMMAND *deferred; | |
394 | { | |
395 | register int i, j; | |
ccc6cda3 | 396 | JOB *newjob; |
726f6388 JA |
397 | sigset_t set, oset; |
398 | ||
399 | BLOCK_CHILD (set, oset); | |
400 | ||
401 | #if defined (PGRP_PIPE) | |
402 | /* The parent closes the process group synchronization pipe. */ | |
403 | pipe_close (pgrp_pipe); | |
404 | #endif | |
ccc6cda3 | 405 | |
726f6388 JA |
406 | cleanup_dead_jobs (); |
407 | ||
ccc6cda3 | 408 | if (job_slots == 0) |
726f6388 | 409 | { |
ccc6cda3 JA |
410 | job_slots = JOB_SLOTS; |
411 | jobs = (JOB **)xmalloc (job_slots * sizeof (JOB *)); | |
726f6388 JA |
412 | |
413 | /* Now blank out these new entries. */ | |
414 | for (i = 0; i < job_slots; i++) | |
415 | jobs[i] = (JOB *)NULL; | |
416 | } | |
417 | ||
418 | /* Scan from the last slot backward, looking for the next free one. */ | |
419 | if (interactive) | |
420 | { | |
421 | for (i = job_slots; i; i--) | |
422 | if (jobs[i - 1]) | |
423 | break; | |
424 | } | |
425 | else | |
426 | { | |
427 | /* If we're not interactive, we don't need to monotonically increase | |
428 | the job number (in fact, we don't care about the job number at all), | |
429 | so we can simply scan for the first free slot. This helps to keep | |
430 | us from continuously reallocating the jobs array when running | |
431 | certain kinds of shell loops, and saves time spent searching. */ | |
432 | for (i = 0; i < job_slots; i++) | |
ccc6cda3 | 433 | if (jobs[i] == 0) |
726f6388 JA |
434 | break; |
435 | } | |
436 | ||
437 | /* Do we need more room? */ | |
438 | if (i == job_slots) | |
439 | { | |
440 | job_slots += JOB_SLOTS; | |
441 | jobs = (JOB **)xrealloc (jobs, ((1 + job_slots) * sizeof (JOB *))); | |
442 | ||
443 | for (j = i; j < job_slots; j++) | |
444 | jobs[j] = (JOB *)NULL; | |
445 | } | |
446 | ||
447 | /* Add the current pipeline to the job list. */ | |
448 | if (the_pipeline) | |
449 | { | |
450 | register PROCESS *p; | |
ccc6cda3 | 451 | int any_alive, any_stopped; |
726f6388 JA |
452 | |
453 | newjob = (JOB *)xmalloc (sizeof (JOB)); | |
454 | ||
ccc6cda3 JA |
455 | for (p = the_pipeline; p->next != the_pipeline; p = p->next) |
456 | ; | |
726f6388 JA |
457 | p->next = (PROCESS *)NULL; |
458 | newjob->pipe = REVERSE_LIST (the_pipeline, PROCESS *); | |
ccc6cda3 JA |
459 | for (p = newjob->pipe; p->next; p = p->next) |
460 | ; | |
726f6388 JA |
461 | p->next = newjob->pipe; |
462 | ||
463 | the_pipeline = (PROCESS *)NULL; | |
464 | newjob->pgrp = pipeline_pgrp; | |
465 | pipeline_pgrp = 0; | |
466 | ||
467 | newjob->flags = 0; | |
468 | ||
469 | /* Flag to see if in another pgrp. */ | |
470 | if (job_control) | |
471 | newjob->flags |= J_JOBCONTROL; | |
472 | ||
473 | /* Set the state of this pipeline. */ | |
ccc6cda3 JA |
474 | p = newjob->pipe; |
475 | any_alive = any_stopped = 0; | |
476 | do | |
477 | { | |
478 | any_alive |= p->running; | |
479 | any_stopped |= WIFSTOPPED (p->status); | |
480 | p = p->next; | |
481 | } | |
482 | while (p != newjob->pipe); | |
726f6388 | 483 | |
ccc6cda3 | 484 | newjob->state = any_alive ? JRUNNING : (any_stopped ? JSTOPPED : JDEAD); |
726f6388 JA |
485 | newjob->wd = job_working_directory (); |
486 | newjob->deferred = deferred; | |
487 | ||
ccc6cda3 JA |
488 | newjob->j_cleanup = (VFunction *)NULL; |
489 | newjob->cleanarg = (PTR_T) NULL; | |
490 | ||
726f6388 | 491 | jobs[i] = newjob; |
ccc6cda3 JA |
492 | if (newjob->state == JDEAD && (newjob->flags & J_FOREGROUND)) |
493 | setjstatus (i); | |
726f6388 | 494 | } |
ccc6cda3 JA |
495 | else |
496 | newjob = (JOB *)NULL; | |
726f6388 JA |
497 | |
498 | if (async) | |
499 | { | |
500 | if (newjob) | |
501 | newjob->flags &= ~J_FOREGROUND; | |
502 | reset_current (); | |
503 | } | |
504 | else | |
505 | { | |
506 | if (newjob) | |
507 | { | |
508 | newjob->flags |= J_FOREGROUND; | |
509 | /* | |
510 | * !!!!! NOTE !!!!! (chet@ins.cwru.edu) | |
511 | * | |
512 | * The currently-accepted job control wisdom says to set the | |
513 | * terminal's process group n+1 times in an n-step pipeline: | |
514 | * once in the parent and once in each child. This is where | |
515 | * the parent gives it away. | |
516 | * | |
517 | */ | |
518 | if (job_control && newjob->pgrp) | |
519 | give_terminal_to (newjob->pgrp); | |
520 | } | |
521 | } | |
522 | ||
523 | stop_making_children (); | |
524 | UNBLOCK_CHILD (oset); | |
525 | return (current_job); | |
526 | } | |
527 | ||
528 | /* Delete all DEAD jobs that the user had received notification about. */ | |
529 | static void | |
530 | cleanup_dead_jobs () | |
531 | { | |
532 | register int i; | |
533 | sigset_t set, oset; | |
534 | ||
ccc6cda3 | 535 | if (job_slots == 0 || jobs_list_frozen) |
726f6388 JA |
536 | return; |
537 | ||
538 | BLOCK_CHILD (set, oset); | |
539 | ||
540 | for (i = 0; i < job_slots; i++) | |
ccc6cda3 | 541 | if (jobs[i] && DEADJOB (i) && IS_NOTIFIED (i)) |
726f6388 JA |
542 | delete_job (i); |
543 | ||
544 | UNBLOCK_CHILD (oset); | |
545 | } | |
546 | ||
547 | /* Delete the job at INDEX from the job list. Must be called | |
548 | with SIGCHLD blocked. */ | |
549 | void | |
550 | delete_job (job_index) | |
551 | int job_index; | |
552 | { | |
553 | register JOB *temp; | |
554 | ||
ccc6cda3 | 555 | if (jobs_list_frozen) |
726f6388 JA |
556 | return; |
557 | ||
558 | temp = jobs[job_index]; | |
559 | if (job_index == current_job || job_index == previous_job) | |
560 | reset_current (); | |
561 | ||
562 | jobs[job_index] = (JOB *)NULL; | |
563 | ||
564 | free (temp->wd); | |
565 | discard_pipeline (temp->pipe); | |
566 | ||
567 | if (temp->deferred) | |
568 | dispose_command (temp->deferred); | |
569 | ||
570 | free (temp); | |
571 | } | |
572 | ||
ccc6cda3 JA |
573 | /* Must be called with SIGCHLD blocked. */ |
574 | void | |
575 | nohup_job (job_index) | |
576 | int job_index; | |
577 | { | |
578 | register JOB *temp; | |
579 | ||
580 | temp = jobs[job_index]; | |
581 | if (temp) | |
582 | temp->flags |= J_NOHUP; | |
583 | } | |
584 | ||
726f6388 JA |
585 | /* Get rid of the data structure associated with a process chain. */ |
586 | static void | |
587 | discard_pipeline (chain) | |
588 | register PROCESS *chain; | |
589 | { | |
590 | register PROCESS *this, *next; | |
591 | ||
592 | this = chain; | |
593 | do | |
594 | { | |
595 | next = this->next; | |
ccc6cda3 | 596 | FREE (this->command); |
726f6388 JA |
597 | free (this); |
598 | this = next; | |
599 | } | |
600 | while (this != chain); | |
601 | } | |
602 | ||
603 | /* Add this process to the chain being built in the_pipeline. | |
604 | NAME is the command string that will be exec'ed later. | |
605 | PID is the process id of the child. */ | |
606 | static void | |
607 | add_process (name, pid) | |
608 | char *name; | |
609 | pid_t pid; | |
610 | { | |
ccc6cda3 | 611 | PROCESS *t, *p; |
726f6388 | 612 | |
ccc6cda3 | 613 | t = (PROCESS *)xmalloc (sizeof (PROCESS)); |
726f6388 JA |
614 | t->next = the_pipeline; |
615 | t->pid = pid; | |
616 | WSTATUS (t->status) = 0; | |
617 | t->running = 1; | |
618 | t->command = name; | |
619 | the_pipeline = t; | |
620 | ||
ccc6cda3 | 621 | if (t->next == 0) |
726f6388 JA |
622 | t->next = t; |
623 | else | |
624 | { | |
ccc6cda3 | 625 | p = t->next; |
726f6388 JA |
626 | while (p->next != t->next) |
627 | p = p->next; | |
628 | p->next = t; | |
629 | } | |
630 | } | |
631 | ||
632 | #if 0 | |
633 | /* Take the last job and make it the first job. Must be called with | |
634 | SIGCHLD blocked. */ | |
ccc6cda3 | 635 | int |
726f6388 JA |
636 | rotate_the_pipeline () |
637 | { | |
638 | PROCESS *p; | |
639 | ||
640 | if (the_pipeline->next == the_pipeline) | |
641 | return; | |
642 | for (p = the_pipeline; p->next != the_pipeline; p = p->next) | |
643 | ; | |
644 | the_pipeline = p; | |
645 | } | |
646 | ||
647 | /* Reverse the order of the processes in the_pipeline. Must be called with | |
648 | SIGCHLD blocked. */ | |
ccc6cda3 | 649 | int |
726f6388 JA |
650 | reverse_the_pipeline () |
651 | { | |
652 | PROCESS *p, *n; | |
653 | ||
654 | if (the_pipeline->next == the_pipeline) | |
655 | return; | |
656 | ||
657 | for (p = the_pipeline; p->next != the_pipeline; p = p->next) | |
658 | ; | |
659 | p->next = (PROCESS *)NULL; | |
660 | ||
661 | n = REVERSE_LIST (the_pipeline, PROCESS *); | |
662 | ||
663 | the_pipeline = n; | |
664 | for (p = the_pipeline; p->next; p = p->next) | |
665 | ; | |
666 | p->next = the_pipeline; | |
667 | } | |
668 | #endif | |
669 | ||
670 | /* Map FUNC over the list of jobs. If FUNC returns non-zero, | |
671 | then it is time to stop mapping, and that is the return value | |
672 | for map_over_jobs. FUNC is called with a JOB, arg1, arg2, | |
673 | and INDEX. */ | |
674 | static int | |
675 | map_over_jobs (func, arg1, arg2) | |
676 | Function *func; | |
677 | int arg1, arg2; | |
678 | { | |
679 | register int i; | |
680 | int result; | |
681 | sigset_t set, oset; | |
682 | ||
683 | BLOCK_CHILD (set, oset); | |
726f6388 | 684 | |
ccc6cda3 | 685 | for (i = result = 0; i < job_slots; i++) |
726f6388 JA |
686 | { |
687 | if (jobs[i]) | |
688 | { | |
689 | result = (*func)(jobs[i], arg1, arg2, i); | |
690 | if (result) | |
691 | break; | |
692 | } | |
693 | } | |
694 | ||
695 | UNBLOCK_CHILD (oset); | |
ccc6cda3 | 696 | |
726f6388 JA |
697 | return (result); |
698 | } | |
699 | ||
700 | /* Cause all the jobs in the current pipeline to exit. */ | |
701 | void | |
702 | terminate_current_pipeline () | |
703 | { | |
704 | if (pipeline_pgrp && pipeline_pgrp != shell_pgrp) | |
705 | { | |
706 | killpg (pipeline_pgrp, SIGTERM); | |
707 | killpg (pipeline_pgrp, SIGCONT); | |
708 | } | |
709 | } | |
710 | ||
711 | /* Cause all stopped jobs to exit. */ | |
712 | void | |
713 | terminate_stopped_jobs () | |
714 | { | |
715 | register int i; | |
716 | ||
717 | for (i = 0; i < job_slots; i++) | |
718 | { | |
ccc6cda3 | 719 | if (jobs[i] && STOPPED (i)) |
726f6388 JA |
720 | { |
721 | killpg (jobs[i]->pgrp, SIGTERM); | |
722 | killpg (jobs[i]->pgrp, SIGCONT); | |
723 | } | |
724 | } | |
725 | } | |
726 | ||
ccc6cda3 JA |
727 | /* Cause all jobs, running or stopped, to receive a hangup signal. If |
728 | a job is marked J_NOHUP, don't send the SIGHUP. */ | |
726f6388 JA |
729 | void |
730 | hangup_all_jobs () | |
731 | { | |
732 | register int i; | |
733 | ||
734 | for (i = 0; i < job_slots; i++) | |
735 | { | |
736 | if (jobs[i]) | |
737 | { | |
ccc6cda3 JA |
738 | if ((jobs[i]->flags & J_NOHUP) == 0) |
739 | killpg (jobs[i]->pgrp, SIGHUP); | |
740 | if (STOPPED (i)) | |
726f6388 JA |
741 | killpg (jobs[i]->pgrp, SIGCONT); |
742 | } | |
743 | } | |
744 | } | |
745 | ||
746 | void | |
747 | kill_current_pipeline () | |
748 | { | |
749 | stop_making_children (); | |
750 | start_pipeline (); | |
751 | } | |
752 | ||
753 | /* Return the pipeline that PID belongs to. Note that the pipeline | |
754 | doesn't have to belong to a job. Must be called with SIGCHLD blocked. */ | |
755 | static PROCESS * | |
756 | find_pipeline (pid) | |
757 | pid_t pid; | |
758 | { | |
759 | int job; | |
ccc6cda3 | 760 | register PROCESS *p; |
726f6388 JA |
761 | |
762 | /* See if this process is in the pipeline that we are building. */ | |
763 | if (the_pipeline) | |
764 | { | |
ccc6cda3 | 765 | p = the_pipeline; |
726f6388 JA |
766 | do |
767 | { | |
768 | /* Return it if we found it. */ | |
769 | if (p->pid == pid) | |
770 | return (p); | |
771 | ||
772 | p = p->next; | |
773 | } | |
774 | while (p != the_pipeline); | |
775 | } | |
776 | ||
777 | job = find_job (pid); | |
778 | ||
ccc6cda3 | 779 | return (job == NO_JOB) ? (PROCESS *)NULL : jobs[job]->pipe; |
726f6388 JA |
780 | } |
781 | ||
782 | /* Return the job index that PID belongs to, or NO_JOB if it doesn't | |
783 | belong to any job. Must be called with SIGCHLD blocked. */ | |
784 | static int | |
785 | find_job (pid) | |
786 | pid_t pid; | |
787 | { | |
788 | register int i; | |
789 | register PROCESS *p; | |
790 | ||
791 | for (i = 0; i < job_slots; i++) | |
792 | { | |
793 | if (jobs[i]) | |
794 | { | |
795 | p = jobs[i]->pipe; | |
796 | ||
797 | do | |
798 | { | |
799 | if (p->pid == pid) | |
800 | return (i); | |
801 | ||
802 | p = p->next; | |
803 | } | |
804 | while (p != jobs[i]->pipe); | |
805 | } | |
806 | } | |
807 | ||
808 | return (NO_JOB); | |
809 | } | |
810 | ||
811 | /* Print descriptive information about the job with leader pid PID. */ | |
812 | void | |
813 | describe_pid (pid) | |
814 | pid_t pid; | |
815 | { | |
816 | int job; | |
817 | sigset_t set, oset; | |
818 | ||
819 | BLOCK_CHILD (set, oset); | |
820 | ||
821 | job = find_job (pid); | |
822 | ||
823 | if (job != NO_JOB) | |
ccc6cda3 | 824 | printf ("[%d] %d\n", job + 1, (int)pid); |
726f6388 | 825 | else |
ccc6cda3 | 826 | programming_error ("describe_pid: %d: no such pid", (int)pid); |
726f6388 JA |
827 | |
828 | UNBLOCK_CHILD (oset); | |
829 | } | |
830 | ||
831 | /* This is the way to print out information on a job if you | |
832 | know the index. FORMAT is: | |
833 | ||
834 | JLIST_NORMAL) [1]+ Running emacs | |
835 | JLIST_LONG ) [1]+ 2378 Running emacs | |
836 | -1 ) [1]+ 2378 emacs | |
837 | ||
838 | JLIST_NORMAL) [1]+ Stopped ls | more | |
839 | JLIST_LONG ) [1]+ 2369 Stopped ls | |
840 | 2367 | more | |
841 | JLIST_PID_ONLY) | |
842 | Just list the pid of the process group leader (really | |
843 | the process group). | |
844 | JLIST_CHANGED_ONLY) | |
845 | Use format JLIST_NORMAL, but list only jobs about which | |
846 | the user has not been notified. */ | |
ccc6cda3 JA |
847 | |
848 | /* Print status for pipeline P. If JOB_INDEX is >= 0, it is the index into | |
849 | the JOBS array corresponding to this pipeline. FORMAT is as described | |
850 | above. Must be called with SIGCHLD blocked. | |
851 | ||
852 | If you're printing a pipeline that's not in the jobs array, like the | |
853 | current pipeline as it's being created, pass -1 for JOB_INDEX */ | |
726f6388 | 854 | static void |
ccc6cda3 JA |
855 | print_pipeline (p, job_index, format, stream) |
856 | PROCESS *p; | |
726f6388 JA |
857 | int job_index, format; |
858 | FILE *stream; | |
859 | { | |
ccc6cda3 JA |
860 | PROCESS *first, *last, *show; |
861 | int es, name_padding; | |
862 | char retcode_name_buffer[20], *temp; | |
726f6388 | 863 | |
ccc6cda3 JA |
864 | if (p == 0) |
865 | return; | |
726f6388 | 866 | |
ccc6cda3 | 867 | first = last = p; |
726f6388 JA |
868 | while (last->next != first) |
869 | last = last->next; | |
870 | ||
726f6388 JA |
871 | for (;;) |
872 | { | |
873 | if (p != first) | |
874 | fprintf (stream, format ? " " : " |"); | |
875 | ||
ccc6cda3 JA |
876 | if (format != JLIST_STANDARD) |
877 | fprintf (stream, "%5d", (int)p->pid); | |
726f6388 JA |
878 | |
879 | fprintf (stream, " "); | |
880 | ||
ccc6cda3 | 881 | if (format > -1 && job_index >= 0) |
726f6388 | 882 | { |
ccc6cda3 JA |
883 | show = format ? p : last; |
884 | temp = "Done"; | |
726f6388 | 885 | |
ccc6cda3 | 886 | if (STOPPED (job_index) && format == 0) |
726f6388 JA |
887 | temp = "Stopped"; |
888 | ||
ccc6cda3 | 889 | else if (RUNNING (job_index)) |
726f6388 JA |
890 | temp = "Running"; |
891 | else | |
892 | { | |
893 | if (WIFSTOPPED (show->status)) | |
894 | temp = strsignal (WSTOPSIG (show->status)); | |
895 | else if (WIFSIGNALED (show->status)) | |
896 | temp = strsignal (WTERMSIG (show->status)); | |
897 | else if (WIFEXITED (show->status)) | |
898 | { | |
726f6388 | 899 | temp = retcode_name_buffer; |
ccc6cda3 | 900 | es = WEXITSTATUS (show->status); |
726f6388 | 901 | |
ccc6cda3 | 902 | if (es == 0) |
726f6388 JA |
903 | strcpy (temp, "Done"); |
904 | else if (posixly_correct) | |
ccc6cda3 | 905 | sprintf (temp, "Done(%d)", es); |
726f6388 | 906 | else |
ccc6cda3 | 907 | sprintf (temp, "Exit %d", es); |
726f6388 JA |
908 | } |
909 | else | |
910 | temp = "Unknown status"; | |
911 | } | |
912 | ||
913 | if (p != first) | |
914 | { | |
915 | if (format) | |
916 | { | |
917 | if (show->running == first->running && | |
918 | WSTATUS (show->status) == WSTATUS (first->status)) | |
919 | temp = ""; | |
920 | } | |
921 | else | |
922 | temp = (char *)NULL; | |
923 | } | |
924 | ||
925 | if (temp) | |
926 | { | |
726f6388 JA |
927 | fprintf (stream, "%s", temp); |
928 | ||
ccc6cda3 JA |
929 | es = STRLEN (temp); |
930 | if (es == 0) | |
931 | es = 2; /* strlen ("| ") */ | |
932 | name_padding = LONGEST_SIGNAL_DESC - es; | |
726f6388 JA |
933 | |
934 | fprintf (stream, "%*s", name_padding, ""); | |
935 | ||
ccc6cda3 | 936 | if ((WIFSTOPPED (show->status) == 0) && WIFCORED (show->status)) |
726f6388 JA |
937 | fprintf (stream, "(core dumped) "); |
938 | } | |
939 | } | |
940 | ||
941 | if (p != first && format) | |
942 | fprintf (stream, "| "); | |
943 | ||
944 | if (p->command) | |
945 | fprintf (stream, "%s", p->command); | |
946 | ||
ccc6cda3 | 947 | if (p == last && job_index >= 0) |
726f6388 | 948 | { |
ccc6cda3 | 949 | temp = current_working_directory (); |
726f6388 | 950 | |
ccc6cda3 | 951 | if (RUNNING (job_index) && (IS_FOREGROUND (job_index) == 0)) |
726f6388 JA |
952 | fprintf (stream, " &"); |
953 | ||
ccc6cda3 | 954 | if (strcmp (temp, jobs[job_index]->wd) != 0) |
726f6388 | 955 | fprintf (stream, |
ccc6cda3 | 956 | " (wd: %s)", polite_directory_format (jobs[job_index]->wd)); |
726f6388 JA |
957 | } |
958 | ||
959 | if (format || (p == last)) | |
960 | fprintf (stream, "\r\n"); | |
961 | ||
962 | if (p == last) | |
963 | break; | |
964 | p = p->next; | |
965 | } | |
726f6388 | 966 | fflush (stream); |
ccc6cda3 JA |
967 | } |
968 | ||
969 | static void | |
970 | pretty_print_job (job_index, format, stream) | |
971 | int job_index, format; | |
972 | FILE *stream; | |
973 | { | |
974 | register PROCESS *p; | |
975 | sigset_t set, oset; | |
976 | ||
977 | BLOCK_CHILD (set, oset); | |
978 | ||
979 | /* Format only pid information about the process group leader? */ | |
980 | if (format == JLIST_PID_ONLY) | |
981 | { | |
982 | fprintf (stream, "%d\n", (int)jobs[job_index]->pipe->pid); | |
983 | UNBLOCK_CHILD (oset); | |
984 | return; | |
985 | } | |
986 | ||
987 | if (format == JLIST_CHANGED_ONLY) | |
988 | { | |
989 | if (IS_NOTIFIED (job_index)) | |
990 | { | |
991 | UNBLOCK_CHILD (oset); | |
992 | return; | |
993 | } | |
994 | format = JLIST_STANDARD; | |
995 | } | |
996 | ||
997 | if (format != JLIST_NONINTERACTIVE) | |
998 | fprintf (stream, "[%d]%c ", job_index + 1, | |
999 | (job_index == current_job) ? '+': | |
1000 | (job_index == previous_job) ? '-' : ' '); | |
1001 | ||
1002 | if (format == JLIST_NONINTERACTIVE) | |
1003 | format = JLIST_LONG; | |
1004 | ||
1005 | p = jobs[job_index]->pipe; | |
1006 | ||
1007 | /* We have printed information about this job. When the job's | |
1008 | status changes, waitchld () sets the notification flag to 0. */ | |
1009 | jobs[job_index]->flags |= J_NOTIFIED; | |
1010 | ||
1011 | print_pipeline (p, job_index, format, stream); | |
1012 | ||
726f6388 JA |
1013 | UNBLOCK_CHILD (oset); |
1014 | } | |
1015 | ||
ccc6cda3 JA |
1016 | static int |
1017 | print_job (job, format, state, job_index) | |
1018 | JOB *job; | |
1019 | int format, state, job_index; | |
1020 | { | |
1021 | if (state == -1 || (JOB_STATE)state == job->state) | |
1022 | pretty_print_job (job_index, format, stdout); | |
1023 | return (0); | |
1024 | } | |
1025 | ||
1026 | void | |
726f6388 JA |
1027 | list_one_job (job, format, ignore, job_index) |
1028 | JOB *job; | |
1029 | int format, ignore, job_index; | |
1030 | { | |
ccc6cda3 JA |
1031 | print_job (job, format, -1, job_index); |
1032 | } | |
1033 | ||
1034 | void | |
1035 | list_stopped_jobs (format) | |
1036 | int format; | |
1037 | { | |
1038 | cleanup_dead_jobs (); | |
1039 | map_over_jobs (print_job, format, (int)JSTOPPED); | |
1040 | } | |
1041 | ||
1042 | void | |
1043 | list_running_jobs (format) | |
1044 | int format; | |
1045 | { | |
1046 | cleanup_dead_jobs (); | |
1047 | map_over_jobs (print_job, format, (int)JRUNNING); | |
726f6388 JA |
1048 | } |
1049 | ||
1050 | /* List jobs. If FORMAT is non-zero, then the long form of the information | |
1051 | is printed, else just a short version. */ | |
1052 | void | |
ccc6cda3 | 1053 | list_all_jobs (format) |
726f6388 JA |
1054 | int format; |
1055 | { | |
1056 | cleanup_dead_jobs (); | |
ccc6cda3 | 1057 | map_over_jobs (print_job, format, -1); |
726f6388 JA |
1058 | } |
1059 | ||
1060 | /* Fork, handling errors. Returns the pid of the newly made child, or 0. | |
1061 | COMMAND is just for remembering the name of the command; we don't do | |
1062 | anything else with it. ASYNC_P says what to do with the tty. If | |
1063 | non-zero, then don't give it away. */ | |
1064 | pid_t | |
1065 | make_child (command, async_p) | |
1066 | char *command; | |
1067 | int async_p; | |
1068 | { | |
1069 | sigset_t set, oset; | |
1070 | pid_t pid; | |
1071 | ||
1072 | sigemptyset (&set); | |
1073 | sigaddset (&set, SIGCHLD); | |
1074 | sigaddset (&set, SIGINT); | |
1075 | sigemptyset (&oset); | |
1076 | sigprocmask (SIG_BLOCK, &set, &oset); | |
1077 | ||
1078 | making_children (); | |
1079 | ||
1080 | #if defined (BUFFERED_INPUT) | |
1081 | /* If default_buffered_input is active, we are reading a script. If | |
1082 | the command is asynchronous, we have already duplicated /dev/null | |
1083 | as fd 0, but have not changed the buffered stream corresponding to | |
1084 | the old fd 0. We don't want to sync the stream in this case. */ | |
1085 | if (default_buffered_input != -1 && | |
1086 | (!async_p || default_buffered_input > 0)) | |
1087 | sync_buffered_stream (default_buffered_input); | |
1088 | #endif /* BUFFERED_INPUT */ | |
1089 | ||
1090 | /* Create the child, handle severe errors. */ | |
1091 | if ((pid = fork ()) < 0) | |
1092 | { | |
ccc6cda3 | 1093 | sys_error ("fork"); |
726f6388 JA |
1094 | |
1095 | /* Kill all of the processes in the current pipeline. */ | |
1096 | terminate_current_pipeline (); | |
1097 | ||
1098 | /* Discard the current pipeline, if any. */ | |
1099 | if (the_pipeline) | |
1100 | kill_current_pipeline (); | |
1101 | ||
1102 | throw_to_top_level (); /* Reset signals, etc. */ | |
1103 | } | |
1104 | ||
1105 | if (pid == 0) | |
1106 | { | |
1107 | /* In the child. Give this child the right process group, set the | |
1108 | signals to the default state for a new process. */ | |
ccc6cda3 | 1109 | pid_t mine; |
726f6388 | 1110 | |
ccc6cda3 | 1111 | mine = getpid (); |
726f6388 JA |
1112 | #if defined (BUFFERED_INPUT) |
1113 | /* Close default_buffered_input if it's > 0. We don't close it if it's | |
1114 | 0 because that's the file descriptor used when redirecting input, | |
1115 | and it's wrong to close the file in that case. */ | |
1116 | if (default_buffered_input > 0) | |
1117 | { | |
1118 | close_buffered_fd (default_buffered_input); | |
1119 | default_buffered_input = bash_input.location.buffered_fd = -1; | |
1120 | } | |
1121 | #endif /* BUFFERED_INPUT */ | |
1122 | ||
1123 | /* Restore top-level signal mask. */ | |
1124 | sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL); | |
1125 | ||
1126 | if (job_control) | |
1127 | { | |
1128 | /* All processes in this pipeline belong in the same | |
1129 | process group. */ | |
1130 | ||
ccc6cda3 | 1131 | if (pipeline_pgrp == 0) /* This is the first child. */ |
726f6388 JA |
1132 | pipeline_pgrp = mine; |
1133 | ||
1134 | /* Check for running command in backquotes. */ | |
1135 | if (pipeline_pgrp == shell_pgrp) | |
ccc6cda3 | 1136 | ignore_tty_job_signals (); |
726f6388 | 1137 | else |
ccc6cda3 | 1138 | default_tty_job_signals (); |
726f6388 JA |
1139 | |
1140 | /* Set the process group before trying to mess with the terminal's | |
1141 | process group. This is mandated by POSIX. */ | |
1142 | /* This is in accordance with the Posix 1003.1 standard, | |
1143 | section B.7.2.4, which says that trying to set the terminal | |
1144 | process group with tcsetpgrp() to an unused pgrp value (like | |
1145 | this would have for the first child) is an error. Section | |
1146 | B.4.3.3, p. 237 also covers this, in the context of job control | |
1147 | shells. */ | |
1148 | if (setpgid (mine, pipeline_pgrp) < 0) | |
ccc6cda3 | 1149 | sys_error ("child setpgid (%d to %d)", mine, pipeline_pgrp); |
726f6388 JA |
1150 | #if defined (PGRP_PIPE) |
1151 | if (pipeline_pgrp == mine) | |
1152 | { | |
1153 | #endif | |
ccc6cda3 | 1154 | if (async_p == 0) |
726f6388 JA |
1155 | give_terminal_to (pipeline_pgrp); |
1156 | ||
1157 | #if defined (PGRP_PIPE) | |
1158 | pipe_read (pgrp_pipe); | |
1159 | } | |
1160 | #endif | |
1161 | } | |
1162 | else /* Without job control... */ | |
1163 | { | |
ccc6cda3 | 1164 | if (pipeline_pgrp == 0) |
726f6388 JA |
1165 | pipeline_pgrp = shell_pgrp; |
1166 | ||
1167 | /* If these signals are set to SIG_DFL, we encounter the curious | |
1168 | situation of an interactive ^Z to a running process *working* | |
1169 | and stopping the process, but being unable to do anything with | |
1170 | that process to change its state. On the other hand, if they | |
1171 | are set to SIG_IGN, jobs started from scripts do not stop when | |
1172 | the shell running the script gets a SIGTSTP and stops. */ | |
1173 | ||
ccc6cda3 | 1174 | default_tty_job_signals (); |
726f6388 JA |
1175 | } |
1176 | ||
1177 | #if defined (PGRP_PIPE) | |
1178 | /* Release the process group pipe, since our call to setpgid () | |
1179 | is done. The last call to pipe_close is done in stop_pipeline. */ | |
1180 | pipe_close (pgrp_pipe); | |
1181 | #endif /* PGRP_PIPE */ | |
1182 | ||
1183 | if (async_p) | |
1184 | last_asynchronous_pid = getpid (); | |
1185 | } | |
1186 | else | |
1187 | { | |
1188 | /* In the parent. Remember the pid of the child just created | |
1189 | as the proper pgrp if this is the first child. */ | |
1190 | ||
1191 | if (job_control) | |
1192 | { | |
ccc6cda3 | 1193 | if (pipeline_pgrp == 0) |
726f6388 JA |
1194 | { |
1195 | pipeline_pgrp = pid; | |
1196 | /* Don't twiddle terminal pgrps in the parent! This is the bug, | |
1197 | not the good thing of twiddling them in the child! */ | |
1198 | /* give_terminal_to (pipeline_pgrp); */ | |
1199 | } | |
1200 | /* This is done on the recommendation of the Rationale section of | |
1201 | the POSIX 1003.1 standard, where it discusses job control and | |
1202 | shells. It is done to avoid possible race conditions. (Ref. | |
1203 | 1003.1 Rationale, section B.4.3.3, page 236). */ | |
1204 | setpgid (pid, pipeline_pgrp); | |
1205 | } | |
1206 | else | |
1207 | { | |
ccc6cda3 | 1208 | if (pipeline_pgrp == 0) |
726f6388 JA |
1209 | pipeline_pgrp = shell_pgrp; |
1210 | } | |
1211 | ||
1212 | /* Place all processes into the jobs array regardless of the | |
1213 | state of job_control. */ | |
1214 | add_process (command, pid); | |
1215 | ||
1216 | if (async_p) | |
1217 | last_asynchronous_pid = pid; | |
1218 | ||
1219 | last_made_pid = pid; | |
1220 | ||
1221 | /* Unblock SIGINT and SIGCHLD. */ | |
1222 | sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); | |
1223 | } | |
1224 | ||
1225 | return (pid); | |
1226 | } | |
1227 | ||
ccc6cda3 JA |
1228 | void |
1229 | ignore_tty_job_signals () | |
1230 | { | |
1231 | set_signal_handler (SIGTSTP, SIG_IGN); | |
1232 | set_signal_handler (SIGTTIN, SIG_IGN); | |
1233 | set_signal_handler (SIGTTOU, SIG_IGN); | |
1234 | } | |
1235 | ||
1236 | void | |
1237 | default_tty_job_signals () | |
1238 | { | |
1239 | set_signal_handler (SIGTSTP, SIG_DFL); | |
1240 | set_signal_handler (SIGTTIN, SIG_DFL); | |
1241 | set_signal_handler (SIGTTOU, SIG_DFL); | |
1242 | } | |
1243 | ||
726f6388 JA |
1244 | /* When we end a job abnormally, or if we stop a job, we set the tty to the |
1245 | state kept in here. When a job ends normally, we set the state in here | |
1246 | to the state of the tty. */ | |
1247 | ||
1248 | #if defined (NEW_TTY_DRIVER) | |
1249 | static struct sgttyb shell_tty_info; | |
1250 | static struct tchars shell_tchars; | |
1251 | static struct ltchars shell_ltchars; | |
1252 | #endif /* NEW_TTY_DRIVER */ | |
1253 | ||
1254 | #if defined (TERMIO_TTY_DRIVER) | |
1255 | static struct termio shell_tty_info; | |
1256 | #endif /* TERMIO_TTY_DRIVER */ | |
1257 | ||
1258 | #if defined (TERMIOS_TTY_DRIVER) | |
1259 | static struct termios shell_tty_info; | |
1260 | #endif /* TERMIOS_TTY_DRIVER */ | |
1261 | ||
1262 | #if defined (NEW_TTY_DRIVER) && defined (DRAIN_OUTPUT) | |
1263 | /* Since the BSD tty driver does not allow us to change the tty modes | |
1264 | while simultaneously waiting for output to drain and preserving | |
1265 | typeahead, we have to drain the output ourselves before calling | |
1266 | ioctl. We cheat by finding the length of the output queue, and | |
1267 | using select to wait for an appropriate length of time. This is | |
1268 | a hack, and should be labeled as such (it's a hastily-adapted | |
1269 | mutation of a `usleep' implementation). It's only reason for | |
1270 | existing is the flaw in the BSD tty driver. */ | |
1271 | ||
1272 | static int ttspeeds[] = | |
1273 | { | |
1274 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, | |
1275 | 1800, 2400, 4800, 9600, 19200, 38400 | |
1276 | }; | |
1277 | ||
1278 | static void | |
1279 | draino (fd, ospeed) | |
1280 | int fd, ospeed; | |
1281 | { | |
1282 | register int delay = ttspeeds[ospeed]; | |
1283 | int n; | |
1284 | ||
1285 | if (!delay) | |
1286 | return; | |
1287 | ||
1288 | while ((ioctl (fd, TIOCOUTQ, &n) == 0) && n) | |
1289 | { | |
1290 | if (n > (delay / 100)) | |
1291 | { | |
1292 | struct timeval tv; | |
1293 | ||
1294 | n *= 10; /* 2 bits more for conservativeness. */ | |
1295 | tv.tv_sec = n / delay; | |
1296 | tv.tv_usec = ((n % delay) * 1000000) / delay; | |
1297 | select (fd, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv); | |
1298 | } | |
1299 | else | |
1300 | break; | |
1301 | } | |
1302 | } | |
1303 | #endif /* NEW_TTY_DRIVER && DRAIN_OUTPUT */ | |
1304 | ||
1305 | /* Return the fd from which we are actually getting input. */ | |
1306 | #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr) | |
1307 | ||
1308 | /* Fill the contents of shell_tty_info with the current tty info. */ | |
ccc6cda3 | 1309 | int |
726f6388 JA |
1310 | get_tty_state () |
1311 | { | |
ccc6cda3 | 1312 | int tty; |
726f6388 | 1313 | |
ccc6cda3 | 1314 | tty = input_tty (); |
726f6388 JA |
1315 | if (tty != -1) |
1316 | { | |
1317 | #if defined (NEW_TTY_DRIVER) | |
1318 | ioctl (tty, TIOCGETP, &shell_tty_info); | |
1319 | ioctl (tty, TIOCGETC, &shell_tchars); | |
1320 | ioctl (tty, TIOCGLTC, &shell_ltchars); | |
1321 | #endif /* NEW_TTY_DRIVER */ | |
1322 | ||
1323 | #if defined (TERMIO_TTY_DRIVER) | |
1324 | ioctl (tty, TCGETA, &shell_tty_info); | |
1325 | #endif /* TERMIO_TTY_DRIVER */ | |
1326 | ||
1327 | #if defined (TERMIOS_TTY_DRIVER) | |
1328 | if (tcgetattr (tty, &shell_tty_info) < 0) | |
1329 | { | |
1330 | #if 0 | |
1331 | /* Only print an error message if we're really interactive at | |
1332 | this time. */ | |
1333 | if (interactive) | |
ccc6cda3 | 1334 | sys_error ("[%d: %d] tcgetattr", getpid (), shell_level); |
726f6388 JA |
1335 | #endif |
1336 | return -1; | |
1337 | } | |
1338 | #endif /* TERMIOS_TTY_DRIVER */ | |
ccc6cda3 JA |
1339 | if (check_window_size) |
1340 | get_new_window_size (0); | |
726f6388 JA |
1341 | } |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | /* Make the current tty use the state in shell_tty_info. */ | |
ccc6cda3 | 1346 | int |
726f6388 JA |
1347 | set_tty_state () |
1348 | { | |
1349 | int tty = input_tty (); | |
1350 | ||
1351 | if (tty != -1) | |
1352 | { | |
1353 | #if defined (NEW_TTY_DRIVER) | |
1354 | # if defined (DRAIN_OUTPUT) | |
1355 | draino (tty, shell_tty_info.sg_ospeed); | |
1356 | # endif /* DRAIN_OUTPUT */ | |
1357 | ioctl (tty, TIOCSETN, &shell_tty_info); | |
1358 | ioctl (tty, TIOCSETC, &shell_tchars); | |
1359 | ioctl (tty, TIOCSLTC, &shell_ltchars); | |
1360 | #endif /* NEW_TTY_DRIVER */ | |
1361 | ||
1362 | #if defined (TERMIO_TTY_DRIVER) | |
1363 | ioctl (tty, TCSETAW, &shell_tty_info); | |
1364 | #endif /* TERMIO_TTY_DRIVER */ | |
1365 | ||
1366 | #if defined (TERMIOS_TTY_DRIVER) | |
1367 | if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0) | |
1368 | { | |
1369 | /* Only print an error message if we're really interactive at | |
1370 | this time. */ | |
1371 | if (interactive) | |
ccc6cda3 | 1372 | sys_error ("[%d: %d] tcsetattr", getpid (), shell_level); |
726f6388 JA |
1373 | return -1; |
1374 | } | |
1375 | #endif /* TERMIOS_TTY_DRIVER */ | |
1376 | } | |
1377 | return 0; | |
1378 | } | |
1379 | ||
1380 | /* Given an index into the jobs array JOB, return the pid of the last | |
1381 | process in that job's pipeline. This is the one whose exit status | |
1382 | counts. */ | |
1383 | static pid_t | |
1384 | last_pid (job) | |
1385 | int job; | |
1386 | { | |
1387 | register PROCESS *p; | |
1388 | sigset_t set, oset; | |
1389 | ||
1390 | BLOCK_CHILD (set, oset); | |
1391 | ||
1392 | p = jobs[job]->pipe; | |
1393 | while (p->next != jobs[job]->pipe) | |
1394 | p = p->next; | |
1395 | ||
1396 | UNBLOCK_CHILD (oset); | |
1397 | return (p->pid); | |
1398 | } | |
1399 | ||
1400 | /* Wait for a particular child of the shell to finish executing. | |
1401 | This low-level function prints an error message if PID is not | |
1402 | a child of this shell. It returns -1 if it fails, or 0 if not. */ | |
1403 | int | |
1404 | wait_for_single_pid (pid) | |
1405 | pid_t pid; | |
1406 | { | |
1407 | register PROCESS *child; | |
ccc6cda3 | 1408 | sigset_t set, oset; |
726f6388 | 1409 | |
ccc6cda3 JA |
1410 | BLOCK_CHILD (set, oset); |
1411 | child = find_pipeline (pid); | |
1412 | UNBLOCK_CHILD (oset); | |
726f6388 | 1413 | |
ccc6cda3 | 1414 | if (child == 0) |
726f6388 | 1415 | { |
ccc6cda3 | 1416 | internal_error ("wait: pid %d is not a child of this shell", pid); |
726f6388 JA |
1417 | return (127); |
1418 | } | |
1419 | ||
1420 | return (wait_for (pid)); | |
1421 | } | |
1422 | ||
1423 | /* Wait for all of the backgrounds of this shell to finish. */ | |
1424 | void | |
1425 | wait_for_background_pids () | |
1426 | { | |
ccc6cda3 JA |
1427 | register int i, count; |
1428 | sigset_t set, oset; | |
1429 | pid_t pid; | |
726f6388 | 1430 | |
ccc6cda3 JA |
1431 | for (;;) |
1432 | { | |
726f6388 JA |
1433 | BLOCK_CHILD (set, oset); |
1434 | ||
ccc6cda3 | 1435 | count = 0; |
726f6388 | 1436 | for (i = 0; i < job_slots; i++) |
ccc6cda3 | 1437 | if (jobs[i] && RUNNING (i) && IS_FOREGROUND (i) == 0) |
726f6388 JA |
1438 | { |
1439 | count++; | |
1440 | break; | |
1441 | } | |
1442 | ||
ccc6cda3 | 1443 | if (count == 0) |
726f6388 JA |
1444 | { |
1445 | UNBLOCK_CHILD (oset); | |
1446 | break; | |
1447 | } | |
1448 | ||
1449 | for (i = 0; i < job_slots; i++) | |
ccc6cda3 | 1450 | if (jobs[i] && RUNNING (i) && IS_FOREGROUND (i) == 0) |
726f6388 | 1451 | { |
ccc6cda3 | 1452 | pid = last_pid (i); |
726f6388 JA |
1453 | UNBLOCK_CHILD (oset); |
1454 | QUIT; | |
1455 | wait_for_single_pid (pid); | |
1456 | break; | |
1457 | } | |
1458 | } | |
1459 | } | |
1460 | ||
1461 | /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */ | |
1462 | #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids | |
1463 | static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
1464 | ||
1465 | static void | |
1466 | restore_sigint_handler () | |
1467 | { | |
1468 | if (old_sigint_handler != INVALID_SIGNAL_HANDLER) | |
1469 | { | |
1470 | set_signal_handler (SIGINT, old_sigint_handler); | |
1471 | old_sigint_handler = INVALID_SIGNAL_HANDLER; | |
1472 | } | |
1473 | } | |
1474 | ||
ccc6cda3 | 1475 | static int wait_sigint_received; |
726f6388 JA |
1476 | |
1477 | /* Handle SIGINT while we are waiting for children in a script to exit. | |
1478 | The `wait' builtin should be interruptible, but all others should be | |
1479 | effectively ignored (i.e. not cause the shell to exit). */ | |
1480 | static sighandler | |
1481 | wait_sigint_handler (sig) | |
1482 | int sig; | |
1483 | { | |
1484 | if (interrupt_immediately || | |
1485 | (this_shell_builtin && this_shell_builtin == wait_builtin)) | |
1486 | { | |
1487 | last_command_exit_value = EXECUTION_FAILURE; | |
1488 | restore_sigint_handler (); | |
ccc6cda3 | 1489 | ADDINTERRUPT; |
726f6388 JA |
1490 | QUIT; |
1491 | } | |
1492 | ||
ccc6cda3 JA |
1493 | /* XXX - should this be interrupt_state? If it is, the shell will act |
1494 | as if it got the SIGINT interrupt. */ | |
1495 | wait_sigint_received = 1; | |
1496 | ||
726f6388 JA |
1497 | /* Otherwise effectively ignore the SIGINT and allow the running job to |
1498 | be killed. */ | |
ccc6cda3 | 1499 | SIGRETURN (0); |
726f6388 JA |
1500 | } |
1501 | ||
1502 | static int | |
1503 | process_exit_status (status) | |
1504 | WAIT status; | |
1505 | { | |
1506 | if (WIFSIGNALED (status)) | |
1507 | return (128 + WTERMSIG (status)); | |
ccc6cda3 | 1508 | else if (WIFSTOPPED (status) == 0) |
726f6388 JA |
1509 | return (WEXITSTATUS (status)); |
1510 | else | |
1511 | return (EXECUTION_SUCCESS); | |
1512 | } | |
1513 | ||
ccc6cda3 JA |
1514 | static int |
1515 | job_exit_status (job) | |
1516 | int job; | |
1517 | { | |
1518 | register PROCESS *p; | |
1519 | for (p = jobs[job]->pipe; p->next != jobs[job]->pipe; p = p->next) | |
1520 | ; | |
1521 | return (process_exit_status (p->status)); | |
1522 | } | |
1523 | ||
726f6388 JA |
1524 | /* Wait for pid (one of our children) to terminate, then |
1525 | return the termination state. */ | |
ccc6cda3 JA |
1526 | #define FIND_CHILD(pid, child) \ |
1527 | do \ | |
1528 | { \ | |
1529 | child = find_pipeline (pid); \ | |
1530 | if (child == 0) \ | |
1531 | { \ | |
1532 | give_terminal_to (shell_pgrp); \ | |
1533 | UNBLOCK_CHILD (oset); \ | |
1534 | internal_error ("wait_for: No record of process %d", pid); \ | |
1535 | restore_sigint_handler (); \ | |
1536 | return (termination_state = 127); \ | |
1537 | } \ | |
1538 | } \ | |
1539 | while (0) | |
1540 | ||
726f6388 JA |
1541 | int |
1542 | wait_for (pid) | |
1543 | pid_t pid; | |
1544 | { | |
1545 | int job, termination_state; | |
1546 | register PROCESS *child; | |
1547 | sigset_t set, oset; | |
ccc6cda3 JA |
1548 | #if 0 |
1549 | register PROCESS *p; | |
1550 | int job_state, any_stopped; | |
1551 | #endif | |
726f6388 JA |
1552 | |
1553 | /* In the case that this code is interrupted, and we longjmp () out of it, | |
1554 | we are relying on the code in throw_to_top_level () to restore the | |
1555 | top-level signal mask. */ | |
1556 | BLOCK_CHILD (set, oset); | |
1557 | ||
1558 | /* Ignore interrupts while waiting for a job run without job control | |
1559 | to finish. We don't want the shell to exit if an interrupt is | |
1560 | received, only if one of the jobs run is killed via SIGINT. If | |
ccc6cda3 | 1561 | job control is not set, the job will be run in the same pgrp as |
726f6388 JA |
1562 | the shell, and the shell will see any signals the job gets. */ |
1563 | ||
1564 | /* This is possibly a race condition -- should it go in stop_pipeline? */ | |
1565 | wait_sigint_received = 0; | |
ccc6cda3 | 1566 | if (job_control == 0) |
726f6388 JA |
1567 | old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler); |
1568 | ||
1569 | termination_state = last_command_exit_value; | |
1570 | ||
ccc6cda3 | 1571 | if (interactive && job_control == 0) |
726f6388 JA |
1572 | QUIT; |
1573 | ||
ccc6cda3 JA |
1574 | /* If we say wait_for (), then we have a record of this child somewhere. |
1575 | If it and none of its peers are running, don't call waitchld(). */ | |
726f6388 | 1576 | |
ccc6cda3 JA |
1577 | job = NO_JOB; |
1578 | do | |
726f6388 | 1579 | { |
ccc6cda3 | 1580 | FIND_CHILD (pid, child); |
726f6388 | 1581 | |
ccc6cda3 JA |
1582 | /* If this child is part of a job, then we are really waiting for the |
1583 | job to finish. Otherwise, we are waiting for the child to finish. | |
1584 | We check for JDEAD in case the job state has been set by waitchld | |
1585 | after receipt of a SIGCHLD. */ | |
1586 | if (job == NO_JOB) | |
1587 | job = find_job (pid); | |
726f6388 | 1588 | |
ccc6cda3 JA |
1589 | #if 0 |
1590 | /* XXX - let waitchld take care of setting this. If the job has | |
1591 | already exited before this is called, sigchld_handler will have | |
1592 | called waitchld and this will be set to JDEAD. */ | |
1593 | if (job != NO_JOB && JOBSTATE (job) != JDEAD) | |
726f6388 | 1594 | { |
ccc6cda3 JA |
1595 | job_state = any_stopped = 0; |
1596 | p = jobs[job]->pipe; | |
1597 | do | |
1598 | { | |
1599 | job_state |= p->running; | |
1600 | if (p->running == 0) | |
1601 | any_stopped |= WIFSTOPPED (p->status); | |
1602 | p = p->next; | |
1603 | } | |
1604 | while (p != jobs[job]->pipe); | |
726f6388 | 1605 | |
ccc6cda3 JA |
1606 | if (job_state == 0) |
1607 | jobs[job]->state = any_stopped ? JSTOPPED : JDEAD; | |
726f6388 | 1608 | } |
ccc6cda3 | 1609 | #endif |
726f6388 | 1610 | |
ccc6cda3 JA |
1611 | if (child->running || (job != NO_JOB && RUNNING (job))) |
1612 | { | |
1613 | #if defined (WAITPID_BROKEN) /* SCOv4 */ | |
1614 | sigset_t suspend_set; | |
1615 | sigemptyset (&suspend_set); | |
1616 | sigsuspend (&suspend_set); | |
726f6388 | 1617 | #else /* !WAITPID_BROKEN */ |
ccc6cda3 JA |
1618 | # if defined (MUST_UNBLOCK_CHLD) |
1619 | struct sigaction act, oact; | |
1620 | sigset_t nullset, chldset; | |
1621 | ||
1622 | sigemptyset (&nullset); | |
1623 | sigemptyset (&chldset); | |
1624 | sigprocmask (SIG_SETMASK, &nullset, &chldset); | |
1625 | act.sa_handler = SIG_DFL; | |
1626 | sigemptyset (&act.sa_mask); | |
1627 | sigemptyset (&oact.sa_mask); | |
1628 | act.sa_flags = 0; | |
1629 | sigaction (SIGCHLD, &act, &oact); | |
726f6388 | 1630 | # endif |
ccc6cda3 JA |
1631 | waiting_for_job = 1; |
1632 | waitchld (pid, 1); | |
1633 | # if defined (MUST_UNBLOCK_CHLD) | |
1634 | sigaction (SIGCHLD, &oact, (struct sigaction *)NULL); | |
1635 | sigprocmask (SIG_SETMASK, &chldset, (sigset_t *)NULL); | |
726f6388 | 1636 | # endif |
ccc6cda3 JA |
1637 | waiting_for_job = 0; |
1638 | #endif /* WAITPID_BROKEN */ | |
1639 | } | |
1640 | ||
1641 | /* If the shell is interactive, and job control is disabled, see | |
1642 | if the foreground process has died due to SIGINT and jump out | |
1643 | of the wait loop if it has. waitchld has already restored the | |
1644 | old SIGINT signal handler. */ | |
1645 | if (interactive && job_control == 0) | |
1646 | QUIT; | |
726f6388 | 1647 | } |
ccc6cda3 | 1648 | while (child->running || (job != NO_JOB && RUNNING (job))); |
726f6388 JA |
1649 | |
1650 | /* The exit state of the command is either the termination state of the | |
1651 | child, or the termination state of the job. If a job, the status | |
1652 | of the last child in the pipeline is the significant one. */ | |
1653 | ||
1654 | if (job != NO_JOB) | |
ccc6cda3 | 1655 | termination_state = job_exit_status (job); |
726f6388 JA |
1656 | else |
1657 | termination_state = process_exit_status (child->status); | |
1658 | ||
ccc6cda3 | 1659 | if (job == NO_JOB || IS_JOBCONTROL (job)) |
726f6388 JA |
1660 | give_terminal_to (shell_pgrp); |
1661 | ||
1662 | /* If the command did not exit cleanly, or the job is just | |
1663 | being stopped, then reset the tty state back to what it | |
1664 | was before this command. Reset the tty state and notify | |
1665 | the user of the job termination only if the shell is | |
1666 | interactive. Clean up any dead jobs in either case. */ | |
1667 | if (job != NO_JOB) | |
1668 | { | |
ccc6cda3 | 1669 | if (interactive_shell && subshell_environment == 0) |
726f6388 JA |
1670 | { |
1671 | if (WIFSIGNALED (child->status) || WIFSTOPPED (child->status)) | |
1672 | set_tty_state (); | |
1673 | else | |
1674 | get_tty_state (); | |
1675 | ||
1676 | /* If job control is enabled, the job was started with job | |
1677 | control, the job was the foreground job, and it was killed | |
1678 | by SIGINT, then print a newline to compensate for the kernel | |
1679 | printing the ^C without a trailing newline. */ | |
ccc6cda3 | 1680 | if (job_control && IS_JOBCONTROL (job) && IS_FOREGROUND (job) && |
726f6388 JA |
1681 | WIFSIGNALED (child->status) && |
1682 | WTERMSIG (child->status) == SIGINT) | |
1683 | { | |
ccc6cda3 JA |
1684 | /* If SIGINT is not trapped and the shell is in a for, while, |
1685 | or until loop, act as if the shell received SIGINT as | |
1686 | well, so the loop can be broken. This doesn't call the | |
1687 | SIGINT signal handler; maybe it should. */ | |
1688 | if (signal_is_trapped (SIGINT) == 0 && loop_level) | |
1689 | ADDINTERRUPT; | |
1690 | else | |
726f6388 | 1691 | { |
ccc6cda3 JA |
1692 | putchar ('\n'); |
1693 | fflush (stdout); | |
726f6388 JA |
1694 | } |
1695 | } | |
1696 | ||
1697 | notify_and_cleanup (); | |
1698 | } | |
1699 | else | |
1700 | { | |
1701 | /* If this job is dead, and the shell is not interactive, make | |
1702 | sure we turn on the notify bit so we don't get an unwanted | |
1703 | message about the job's termination, and so delete_job really | |
1704 | clears the slot in the jobs table. */ | |
ccc6cda3 JA |
1705 | #if 0 |
1706 | if (DEADJOB (job)) | |
726f6388 JA |
1707 | jobs[job]->flags |= J_NOTIFIED; |
1708 | cleanup_dead_jobs (); | |
ccc6cda3 JA |
1709 | #else |
1710 | notify_and_cleanup (); | |
1711 | #endif | |
726f6388 JA |
1712 | } |
1713 | } | |
ccc6cda3 | 1714 | |
726f6388 JA |
1715 | UNBLOCK_CHILD (oset); |
1716 | ||
1717 | /* Restore the original SIGINT signal handler before we return. */ | |
1718 | restore_sigint_handler (); | |
1719 | ||
1720 | return (termination_state); | |
1721 | } | |
1722 | ||
1723 | /* Wait for the last process in the pipeline for JOB. */ | |
1724 | int | |
1725 | wait_for_job (job) | |
1726 | int job; | |
1727 | { | |
ccc6cda3 JA |
1728 | pid_t pid; |
1729 | ||
1730 | pid = last_pid (job); | |
726f6388 JA |
1731 | return (wait_for (pid)); |
1732 | } | |
1733 | ||
1734 | /* Print info about dead jobs, and then delete them from the list | |
1735 | of known jobs. This does not actually delete jobs when the | |
1736 | shell is not interactive, because the dead jobs are not marked | |
1737 | as notified. */ | |
1738 | void | |
1739 | notify_and_cleanup () | |
1740 | { | |
ccc6cda3 | 1741 | if (jobs_list_frozen) |
726f6388 JA |
1742 | return; |
1743 | ||
ccc6cda3 | 1744 | if (interactive || interactive_shell == 0) |
726f6388 JA |
1745 | notify_of_job_status (); |
1746 | ||
1747 | cleanup_dead_jobs (); | |
1748 | } | |
1749 | ||
1750 | /* Make dead jobs disappear from the jobs array without notification. | |
1751 | This is used when the shell is not interactive. */ | |
1752 | void | |
1753 | reap_dead_jobs () | |
1754 | { | |
1755 | mark_dead_jobs_as_notified (); | |
1756 | cleanup_dead_jobs (); | |
1757 | } | |
1758 | ||
1759 | /* Return the next closest (chronologically) job to JOB which is in | |
1760 | STATE. STATE can be JSTOPPED, JRUNNING. NO_JOB is returned if | |
1761 | there is no next recent job. */ | |
1762 | static int | |
1763 | most_recent_job_in_state (job, state) | |
1764 | int job; | |
1765 | JOB_STATE state; | |
1766 | { | |
1767 | register int i, result; | |
1768 | sigset_t set, oset; | |
1769 | ||
1770 | BLOCK_CHILD (set, oset); | |
ccc6cda3 | 1771 | for (result = NO_JOB, i = job - 1; i >= 0; i--) |
726f6388 | 1772 | { |
ccc6cda3 | 1773 | if (jobs[i] && (JOBSTATE (i) == state)) |
726f6388 | 1774 | { |
ccc6cda3 JA |
1775 | result = i; |
1776 | break; | |
726f6388 JA |
1777 | } |
1778 | } | |
1779 | UNBLOCK_CHILD (oset); | |
ccc6cda3 | 1780 | |
726f6388 JA |
1781 | return (result); |
1782 | } | |
1783 | ||
1784 | /* Return the newest *stopped* job older than JOB, or NO_JOB if not | |
1785 | found. */ | |
1786 | static int | |
1787 | last_stopped_job (job) | |
1788 | int job; | |
1789 | { | |
1790 | return (most_recent_job_in_state (job, JSTOPPED)); | |
1791 | } | |
1792 | ||
1793 | /* Return the newest *running* job older than JOB, or NO_JOB if not | |
1794 | found. */ | |
1795 | static int | |
1796 | last_running_job (job) | |
1797 | int job; | |
1798 | { | |
1799 | return (most_recent_job_in_state (job, JRUNNING)); | |
1800 | } | |
1801 | ||
1802 | /* Make JOB be the current job, and make previous be useful. Must be | |
1803 | called with SIGCHLD blocked. */ | |
1804 | static void | |
1805 | set_current_job (job) | |
1806 | int job; | |
1807 | { | |
ccc6cda3 | 1808 | int candidate; |
726f6388 JA |
1809 | |
1810 | if (current_job != job) | |
1811 | { | |
1812 | previous_job = current_job; | |
1813 | current_job = job; | |
1814 | } | |
1815 | ||
1816 | /* First choice for previous_job is the old current_job. */ | |
1817 | if (previous_job != current_job && | |
1818 | previous_job != NO_JOB && | |
1819 | jobs[previous_job] && | |
ccc6cda3 | 1820 | STOPPED (previous_job)) |
726f6388 JA |
1821 | return; |
1822 | ||
1823 | /* Second choice: Newest stopped job that is older than | |
1824 | the current job. */ | |
ccc6cda3 JA |
1825 | candidate = NO_JOB; |
1826 | if (STOPPED (current_job)) | |
726f6388 JA |
1827 | { |
1828 | candidate = last_stopped_job (current_job); | |
1829 | ||
1830 | if (candidate != NO_JOB) | |
1831 | { | |
1832 | previous_job = candidate; | |
1833 | return; | |
1834 | } | |
1835 | } | |
1836 | ||
1837 | /* If we get here, there is either only one stopped job, in which case it is | |
1838 | the current job and the previous job should be set to the newest running | |
1839 | job, or there are only running jobs and the previous job should be set to | |
1840 | the newest running job older than the current job. We decide on which | |
1841 | alternative to use based on whether or not JOBSTATE(current_job) is | |
1842 | JSTOPPED. */ | |
1843 | ||
ccc6cda3 JA |
1844 | candidate = RUNNING (current_job) ? last_running_job (current_job) |
1845 | : last_running_job (job_slots); | |
726f6388 JA |
1846 | |
1847 | if (candidate != NO_JOB) | |
1848 | { | |
1849 | previous_job = candidate; | |
1850 | return; | |
1851 | } | |
1852 | ||
1853 | /* There is only a single job, and it is both `+' and `-'. */ | |
1854 | previous_job = current_job; | |
1855 | } | |
1856 | ||
1857 | /* Make current_job be something useful, if it isn't already. */ | |
1858 | ||
1859 | /* Here's the deal: The newest non-running job should be `+', and the | |
1860 | next-newest non-running job should be `-'. If there is only a single | |
1861 | stopped job, the previous_job is the newest non-running job. If there | |
1862 | are only running jobs, the newest running job is `+' and the | |
1863 | next-newest running job is `-'. Must be called with SIGCHLD blocked. */ | |
ccc6cda3 | 1864 | |
726f6388 JA |
1865 | static void |
1866 | reset_current () | |
1867 | { | |
ccc6cda3 | 1868 | int candidate; |
726f6388 | 1869 | |
ccc6cda3 JA |
1870 | if (job_slots && current_job != NO_JOB && jobs[current_job] && STOPPED (current_job)) |
1871 | candidate = current_job; | |
726f6388 JA |
1872 | else |
1873 | { | |
ccc6cda3 JA |
1874 | candidate = NO_JOB; |
1875 | ||
1876 | /* First choice: the previous job. */ | |
1877 | if (previous_job != NO_JOB && jobs[previous_job] && STOPPED (previous_job)) | |
726f6388 JA |
1878 | candidate = previous_job; |
1879 | ||
1880 | /* Second choice: the most recently stopped job. */ | |
1881 | if (candidate == NO_JOB) | |
1882 | candidate = last_stopped_job (job_slots); | |
1883 | ||
ccc6cda3 | 1884 | /* Third choice: the newest running job. */ |
726f6388 | 1885 | if (candidate == NO_JOB) |
ccc6cda3 | 1886 | candidate = last_running_job (job_slots); |
726f6388 JA |
1887 | } |
1888 | ||
1889 | /* If we found a job to use, then use it. Otherwise, there | |
1890 | are no jobs period. */ | |
1891 | if (candidate != NO_JOB) | |
1892 | set_current_job (candidate); | |
1893 | else | |
1894 | current_job = previous_job = NO_JOB; | |
1895 | } | |
1896 | ||
1897 | /* Start a job. FOREGROUND if non-zero says to do that. Otherwise, | |
1898 | start the job in the background. JOB is a zero-based index into | |
1899 | JOBS. Returns -1 if it is unable to start a job, and the return | |
1900 | status of the job otherwise. */ | |
1901 | int | |
1902 | start_job (job, foreground) | |
1903 | int job, foreground; | |
1904 | { | |
1905 | register PROCESS *p; | |
1906 | int already_running; | |
1907 | sigset_t set, oset; | |
1908 | char *wd; | |
1909 | #if defined (NEW_TTY_DRIVER) | |
1910 | static struct sgttyb save_stty; | |
1911 | #endif | |
726f6388 JA |
1912 | #if defined (TERMIO_TTY_DRIVER) |
1913 | static struct termio save_stty; | |
1914 | #endif | |
726f6388 JA |
1915 | #if defined (TERMIOS_TTY_DRIVER) |
1916 | static struct termios save_stty; | |
1917 | #endif | |
1918 | ||
1919 | BLOCK_CHILD (set, oset); | |
726f6388 | 1920 | |
ccc6cda3 | 1921 | if (DEADJOB (job)) |
726f6388 | 1922 | { |
ccc6cda3 | 1923 | internal_error ("%s: job has terminated", this_command_name); |
726f6388 JA |
1924 | UNBLOCK_CHILD (oset); |
1925 | return (-1); | |
1926 | } | |
1927 | ||
ccc6cda3 JA |
1928 | already_running = RUNNING (job); |
1929 | ||
1930 | if (foreground == 0 && already_running) | |
726f6388 | 1931 | { |
ccc6cda3 | 1932 | internal_error ("%s: bg background job?", this_command_name); |
726f6388 JA |
1933 | UNBLOCK_CHILD (oset); |
1934 | return (-1); | |
1935 | } | |
1936 | ||
1937 | wd = current_working_directory (); | |
1938 | ||
1939 | /* You don't know about the state of this job. Do you? */ | |
1940 | jobs[job]->flags &= ~J_NOTIFIED; | |
1941 | ||
1942 | if (foreground) | |
1943 | { | |
1944 | set_current_job (job); | |
1945 | jobs[job]->flags |= J_FOREGROUND; | |
1946 | } | |
1947 | ||
1948 | /* Tell the outside world what we're doing. */ | |
1949 | p = jobs[job]->pipe; | |
1950 | ||
ccc6cda3 | 1951 | if (foreground == 0) |
726f6388 JA |
1952 | fprintf (stderr, "[%d]%c ", job + 1, |
1953 | (job == current_job) ? '+': ((job == previous_job) ? '-' : ' ')); | |
1954 | ||
1955 | do | |
1956 | { | |
1957 | fprintf (stderr, "%s%s", | |
1958 | p->command ? p->command : "", | |
1959 | p->next != jobs[job]->pipe? " | " : ""); | |
1960 | p = p->next; | |
1961 | } | |
1962 | while (p != jobs[job]->pipe); | |
1963 | ||
ccc6cda3 | 1964 | if (foreground == 0) |
726f6388 JA |
1965 | fprintf (stderr, " &"); |
1966 | ||
1967 | if (strcmp (wd, jobs[job]->wd) != 0) | |
1968 | fprintf (stderr, " (wd: %s)", polite_directory_format (jobs[job]->wd)); | |
1969 | ||
1970 | fprintf (stderr, "\n"); | |
1971 | ||
1972 | /* Run the job. */ | |
ccc6cda3 | 1973 | if (already_running == 0) |
726f6388 JA |
1974 | { |
1975 | /* Each member of the pipeline is now running. */ | |
1976 | p = jobs[job]->pipe; | |
1977 | ||
1978 | do | |
1979 | { | |
1980 | if (WIFSTOPPED (p->status)) | |
1981 | p->running = 1; | |
1982 | p = p->next; | |
1983 | } | |
1984 | while (p != jobs[job]->pipe); | |
1985 | ||
1986 | /* This means that the job is running. */ | |
1987 | JOBSTATE (job) = JRUNNING; | |
1988 | } | |
1989 | ||
1990 | /* Save the tty settings before we start the job in the foreground. */ | |
1991 | if (foreground) | |
1992 | { | |
1993 | get_tty_state (); | |
1994 | save_stty = shell_tty_info; | |
ccc6cda3 JA |
1995 | /* Give the terminal to this job. */ |
1996 | if (IS_JOBCONTROL (job)) | |
726f6388 JA |
1997 | give_terminal_to (jobs[job]->pgrp); |
1998 | } | |
1999 | else | |
2000 | jobs[job]->flags &= ~J_FOREGROUND; | |
2001 | ||
2002 | /* If the job is already running, then don't bother jump-starting it. */ | |
ccc6cda3 | 2003 | if (already_running == 0) |
726f6388 JA |
2004 | { |
2005 | jobs[job]->flags |= J_NOTIFIED; | |
2006 | killpg (jobs[job]->pgrp, SIGCONT); | |
2007 | } | |
2008 | ||
2009 | UNBLOCK_CHILD (oset); | |
2010 | ||
2011 | if (foreground) | |
2012 | { | |
ccc6cda3 JA |
2013 | pid_t pid; |
2014 | int s; | |
726f6388 | 2015 | |
ccc6cda3 JA |
2016 | pid = last_pid (job); |
2017 | s = wait_for (pid); | |
726f6388 JA |
2018 | shell_tty_info = save_stty; |
2019 | set_tty_state (); | |
2020 | return (s); | |
2021 | } | |
2022 | else | |
2023 | { | |
2024 | BLOCK_CHILD (set, oset); | |
2025 | reset_current (); | |
2026 | UNBLOCK_CHILD (oset); | |
2027 | return (0); | |
2028 | } | |
2029 | } | |
2030 | ||
2031 | /* Give PID SIGNAL. This determines what job the pid belongs to (if any). | |
2032 | If PID does belong to a job, and the job is stopped, then CONTinue the | |
2033 | job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null, | |
2034 | then kill the process group associated with PID. */ | |
2035 | int | |
2036 | kill_pid (pid, sig, group) | |
2037 | pid_t pid; | |
2038 | int sig, group; | |
2039 | { | |
2040 | register PROCESS *p; | |
ccc6cda3 | 2041 | int job, result; |
726f6388 JA |
2042 | sigset_t set, oset; |
2043 | ||
2044 | BLOCK_CHILD (set, oset); | |
2045 | p = find_pipeline (pid); | |
2046 | job = find_job (pid); | |
2047 | ||
ccc6cda3 | 2048 | result = EXECUTION_SUCCESS; |
726f6388 JA |
2049 | if (group) |
2050 | { | |
2051 | if (job != NO_JOB) | |
2052 | { | |
2053 | jobs[job]->flags &= ~J_NOTIFIED; | |
2054 | ||
2055 | /* Kill process in backquotes or one started without job control? */ | |
2056 | if (jobs[job]->pgrp == shell_pgrp) | |
2057 | { | |
2058 | p = jobs[job]->pipe; | |
2059 | ||
2060 | do | |
2061 | { | |
2062 | kill (p->pid, sig); | |
2063 | if (p->running == 0 && (sig == SIGTERM || sig == SIGHUP)) | |
2064 | kill (p->pid, SIGCONT); | |
2065 | p = p->next; | |
2066 | } | |
2067 | while (p != jobs[job]->pipe); | |
2068 | } | |
2069 | else | |
2070 | { | |
2071 | result = killpg (jobs[job]->pgrp, sig); | |
ccc6cda3 | 2072 | if (p && STOPPED (job) && (sig == SIGTERM || sig == SIGHUP)) |
726f6388 JA |
2073 | killpg (jobs[job]->pgrp, SIGCONT); |
2074 | } | |
2075 | } | |
2076 | else | |
2077 | result = killpg (pid, sig); | |
2078 | } | |
2079 | else | |
2080 | result = kill (pid, sig); | |
2081 | ||
2082 | UNBLOCK_CHILD (oset); | |
2083 | return (result); | |
2084 | } | |
2085 | ||
ccc6cda3 JA |
2086 | /* sigchld_handler () flushes at least one of the children that we are |
2087 | waiting for. It gets run when we have gotten a SIGCHLD signal. */ | |
726f6388 | 2088 | static sighandler |
ccc6cda3 | 2089 | sigchld_handler (sig) |
726f6388 JA |
2090 | int sig; |
2091 | { | |
ccc6cda3 JA |
2092 | int n; |
2093 | ||
726f6388 JA |
2094 | REINSTALL_SIGCHLD_HANDLER; |
2095 | sigchld++; | |
ccc6cda3 | 2096 | n = 0; |
726f6388 | 2097 | if (waiting_for_job == 0) |
ccc6cda3 JA |
2098 | n = waitchld (-1, 0); |
2099 | SIGRETURN (n); | |
726f6388 | 2100 | } |
ccc6cda3 JA |
2101 | |
2102 | /* waitchld() reaps dead or stopped children. It's called by wait_for and | |
2103 | flush_child, and runs until there aren't any children terminating any more. | |
2104 | If BLOCK is 1, this is to be a blocking wait for a single child, although | |
2105 | an arriving SIGCHLD could cause the wait to be non-blocking. */ | |
726f6388 | 2106 | static int |
ccc6cda3 JA |
2107 | waitchld (wpid, block) |
2108 | pid_t wpid; | |
2109 | int block; | |
726f6388 JA |
2110 | { |
2111 | WAIT status; | |
2112 | PROCESS *child; | |
2113 | pid_t pid; | |
ccc6cda3 JA |
2114 | int call_set_current, last_stopped_job, job, children_exited; |
2115 | int job_state, any_stopped, any_tstped, waitpid_flags, tstatus; | |
2116 | ||
2117 | call_set_current = children_exited = 0; | |
2118 | last_stopped_job = NO_JOB; | |
726f6388 JA |
2119 | |
2120 | do | |
2121 | { | |
ccc6cda3 JA |
2122 | /* We don't want to be notified about jobs stopping if we're not |
2123 | interactive. */ | |
2124 | waitpid_flags = (interactive_shell && subshell_environment == 0) | |
2125 | ? WUNTRACED | |
2126 | : 0; | |
2127 | if (sigchld || block == 0) | |
2128 | waitpid_flags |= WNOHANG; | |
2129 | pid = WAITPID (-1, &status, waitpid_flags); | |
2130 | /* The check for WNOHANG is to make sure we decrement sigchld only | |
2131 | if it was non-zero before we called waitpid. */ | |
2132 | if (sigchld > 0 && (waitpid_flags & WNOHANG)) | |
2133 | sigchld--; | |
2134 | ||
2135 | /* If waitpid returns 0, there are running children. */ | |
2136 | if (pid <= 0) | |
2137 | continue; /* jumps right to the test */ | |
2138 | ||
2139 | children_exited++; | |
2140 | ||
2141 | /* Locate our PROCESS for this pid. */ | |
2142 | child = find_pipeline (pid); | |
2143 | ||
2144 | /* It is not an error to have a child terminate that we did | |
2145 | not have a record of. This child could have been part of | |
2146 | a pipeline in backquote substitution. Even so, I'm not | |
2147 | sure child is ever non-zero. */ | |
2148 | if (child == 0) | |
2149 | continue; | |
2150 | ||
2151 | while (child->pid != pid) | |
2152 | child = child->next; | |
2153 | ||
2154 | /* Remember status, and fact that process is not running. */ | |
2155 | child->status = status; | |
2156 | child->running = 0; | |
2157 | ||
2158 | job = find_job (pid); | |
2159 | if (job == NO_JOB) | |
2160 | continue; | |
2161 | ||
2162 | /* Note that we're resetting `child' here because we now want to | |
2163 | deal with the job. */ | |
2164 | child = jobs[job]->pipe; | |
2165 | jobs[job]->flags &= ~J_NOTIFIED; | |
726f6388 | 2166 | |
ccc6cda3 JA |
2167 | /* If all children are not running, but any of them is |
2168 | stopped, then the job is stopped, not dead. */ | |
2169 | job_state = any_stopped = any_tstped = 0; | |
2170 | do | |
726f6388 | 2171 | { |
ccc6cda3 JA |
2172 | job_state |= child->running; |
2173 | if (child->running == 0 && (WIFSTOPPED (child->status))) | |
2174 | { | |
2175 | any_stopped = 1; | |
2176 | any_tstped |= interactive && job_control && | |
2177 | (WSTOPSIG (child->status) == SIGTSTP); | |
2178 | } | |
2179 | child = child->next; | |
2180 | } | |
2181 | while (child != jobs[job]->pipe); | |
726f6388 | 2182 | |
ccc6cda3 JA |
2183 | /* If job_state != 0, the job is still running, so don't bother with |
2184 | setting the process exit status and job state. */ | |
2185 | if (job_state != 0) | |
2186 | continue; | |
2187 | ||
2188 | /* The job is either stopped or dead. Set the state of the job | |
2189 | accordingly. */ | |
2190 | if (any_stopped) | |
2191 | { | |
2192 | jobs[job]->state = JSTOPPED; | |
2193 | jobs[job]->flags &= ~J_FOREGROUND; | |
2194 | call_set_current++; | |
2195 | last_stopped_job = job; | |
2196 | /* Suspending a job with SIGTSTP breaks all active loops. */ | |
2197 | if (any_tstped && loop_level) | |
2198 | breaking = loop_level; | |
2199 | } | |
2200 | else | |
2201 | { | |
2202 | /* ASSERT(child == jobs[job]->pipe); */ | |
2203 | jobs[job]->state = JDEAD; | |
2204 | if (job == last_stopped_job) | |
2205 | last_stopped_job = NO_JOB; | |
2206 | ||
2207 | if (IS_FOREGROUND (job)) | |
2208 | setjstatus (job); /* XXX */ | |
2209 | ||
2210 | /* If this job has a cleanup function associated with it, call it | |
2211 | with `cleanarg' as the single argument, then set the function | |
2212 | pointer to NULL so it is not inadvertently called twice. The | |
2213 | cleanup function is responsible for deallocating cleanarg. */ | |
2214 | if (jobs[job]->j_cleanup) | |
726f6388 | 2215 | { |
ccc6cda3 JA |
2216 | (*jobs[job]->j_cleanup) (jobs[job]->cleanarg); |
2217 | jobs[job]->j_cleanup = (VFunction *)NULL; | |
2218 | } | |
726f6388 | 2219 | |
ccc6cda3 JA |
2220 | /* XXX |
2221 | If we're running a shell script and we get a SIGINT with a | |
2222 | SIGINT trap handler, but the foreground job handles it and | |
2223 | does not exit due to SIGINT, run the trap handler but do not | |
2224 | otherwise act as if we got the interrupt. */ | |
2225 | if (wait_sigint_received && interactive_shell == 0 && | |
2226 | WIFSIGNALED (child->status) == 0 && IS_FOREGROUND (job) && | |
2227 | signal_is_trapped (SIGINT)) | |
2228 | { | |
2229 | wait_sigint_received = 0; | |
2230 | last_command_exit_value = process_exit_status (child->status); | |
726f6388 | 2231 | |
ccc6cda3 JA |
2232 | jobs_list_frozen = 1; |
2233 | tstatus = maybe_call_trap_handler (SIGINT); | |
2234 | jobs_list_frozen = 0; | |
2235 | } | |
726f6388 | 2236 | |
ccc6cda3 JA |
2237 | /* If the foreground job is killed by SIGINT when |
2238 | job control is not active, we need to perform | |
2239 | some special handling. | |
2240 | ||
2241 | The check of wait_sigint_received is a way to | |
2242 | determine if the SIGINT came from the keyboard | |
2243 | (in which case the shell has already seen it, | |
2244 | and wait_sigint_received is non-zero, because | |
2245 | keyboard signals are sent to process groups) | |
2246 | or via kill(2) to the foreground process by | |
2247 | another process (or itself). If the shell did | |
2248 | receive the SIGINT, it needs to perform normal | |
2249 | SIGINT processing. */ | |
2250 | else if (wait_sigint_received && (WTERMSIG (child->status) == SIGINT) && | |
2251 | IS_FOREGROUND (job) && IS_JOBCONTROL (job) == 0) | |
2252 | { | |
2253 | wait_sigint_received = 0; | |
2254 | ||
2255 | /* If SIGINT is trapped, set the exit status so | |
2256 | that the trap handler can see it. */ | |
2257 | if (signal_is_trapped (SIGINT)) | |
2258 | last_command_exit_value = process_exit_status (child->status); | |
2259 | ||
2260 | /* If the signal is trapped, let the trap handler | |
2261 | get it no matter what and simply return if | |
2262 | the trap handler returns. | |
2263 | maybe_call_trap_handler() may cause dead jobs | |
2264 | to be removed from the job table because of | |
2265 | a call to execute_command. Watch out for this. */ | |
2266 | jobs_list_frozen = 1; | |
2267 | tstatus = maybe_call_trap_handler (SIGINT); | |
2268 | jobs_list_frozen = 0; | |
2269 | if (tstatus == 0 && old_sigint_handler != INVALID_SIGNAL_HANDLER) | |
726f6388 | 2270 | { |
ccc6cda3 JA |
2271 | /* wait_sigint_handler () has already seen SIGINT and |
2272 | allowed the wait builtin to jump out. We need to | |
2273 | call the original SIGINT handler. */ | |
2274 | SigHandler *temp_handler; | |
2275 | temp_handler = old_sigint_handler; | |
2276 | restore_sigint_handler (); | |
2277 | if (temp_handler != SIG_IGN) | |
2278 | (*temp_handler) (SIGINT); | |
726f6388 JA |
2279 | } |
2280 | } | |
726f6388 JA |
2281 | } |
2282 | } | |
ccc6cda3 | 2283 | while ((sigchld || block == 0) && pid > (pid_t)0); |
726f6388 JA |
2284 | |
2285 | /* If a job was running and became stopped, then set the current | |
2286 | job. Otherwise, don't change a thing. */ | |
2287 | if (call_set_current) | |
2288 | if (last_stopped_job != NO_JOB) | |
2289 | set_current_job (last_stopped_job); | |
2290 | else | |
2291 | reset_current (); | |
2292 | ||
2293 | /* Call a SIGCHLD trap handler for each child that exits, if one is set. */ | |
2294 | if (job_control && signal_is_trapped (SIGCHLD) && | |
2295 | trap_list[SIGCHLD] != (char *)IGNORE_SIG) | |
2296 | { | |
2297 | char *trap_command; | |
ccc6cda3 | 2298 | int i; |
726f6388 JA |
2299 | |
2300 | /* Turn off the trap list during the call to parse_and_execute () | |
2301 | to avoid potentially infinite recursive calls. Preserve the | |
2302 | values of last_command_exit_value, last_made_pid, and the_pipeline | |
2303 | around the execution of the trap commands. */ | |
2304 | trap_command = savestring (trap_list[SIGCHLD]); | |
2305 | ||
2306 | begin_unwind_frame ("SIGCHLD trap"); | |
2307 | unwind_protect_int (last_command_exit_value); | |
ccc6cda3 JA |
2308 | if (sizeof (pid_t) == sizeof (short)) |
2309 | unwind_protect_short (last_made_pid); | |
2310 | else | |
2311 | unwind_protect_int (last_made_pid); | |
726f6388 | 2312 | unwind_protect_int (interrupt_immediately); |
ccc6cda3 | 2313 | unwind_protect_int (jobs_list_frozen); |
726f6388 JA |
2314 | unwind_protect_pointer (the_pipeline); |
2315 | ||
2316 | /* We have to add the commands this way because they will be run | |
2317 | in reverse order of adding. We don't want maybe_set_sigchld_trap () | |
2318 | to reference freed memory. */ | |
2319 | add_unwind_protect ((Function *)xfree, trap_command); | |
2320 | add_unwind_protect ((Function *)maybe_set_sigchld_trap, trap_command); | |
2321 | ||
2322 | the_pipeline = (PROCESS *)NULL; | |
2323 | restore_default_signal (SIGCHLD); | |
ccc6cda3 JA |
2324 | jobs_list_frozen = 1; |
2325 | for (i = 0; i < children_exited; i++) | |
726f6388 JA |
2326 | { |
2327 | interrupt_immediately = 1; | |
2328 | parse_and_execute (savestring (trap_command), "trap", -1); | |
2329 | } | |
2330 | ||
2331 | run_unwind_frame ("SIGCHLD trap"); | |
2332 | } | |
2333 | ||
2334 | /* We have successfully recorded the useful information about this process | |
2335 | that has just changed state. If we notify asynchronously, and the job | |
2336 | that this process belongs to is no longer running, then notify the user | |
2337 | of that fact now. */ | |
2338 | if (asynchronous_notification && interactive) | |
2339 | notify_of_job_status (); | |
2340 | ||
ccc6cda3 | 2341 | return (children_exited); |
726f6388 JA |
2342 | } |
2343 | ||
2344 | /* Function to call when you want to notify people of changes | |
2345 | in job status. This prints out all jobs which are pending | |
2346 | notification to stderr, and marks those printed as already | |
2347 | notified, thus making them candidates for cleanup. */ | |
2348 | static void | |
2349 | notify_of_job_status () | |
2350 | { | |
2351 | register int job, termsig; | |
2352 | char *dir; | |
2353 | sigset_t set, oset; | |
ccc6cda3 | 2354 | WAIT s; |
726f6388 JA |
2355 | |
2356 | sigemptyset (&set); | |
2357 | sigaddset (&set, SIGCHLD); | |
2358 | sigaddset (&set, SIGTTOU); | |
2359 | sigemptyset (&oset); | |
2360 | sigprocmask (SIG_BLOCK, &set, &oset); | |
2361 | ||
ccc6cda3 | 2362 | for (job = 0, dir = (char *)NULL; job < job_slots; job++) |
726f6388 | 2363 | { |
ccc6cda3 | 2364 | if (jobs[job] && IS_NOTIFIED (job) == 0) |
726f6388 | 2365 | { |
726f6388 JA |
2366 | s = jobs[job]->pipe->status; |
2367 | termsig = WTERMSIG (s); | |
2368 | ||
2369 | /* If job control is disabled, don't print the status messages. | |
ccc6cda3 JA |
2370 | Mark dead jobs as notified so that they get cleaned up. If |
2371 | startup_state == 2, we were started to run `-c command', so | |
2372 | don't print anything. If the shell is not interactive, don't | |
2373 | print anything unless the job was killed by a signal. */ | |
2374 | if ((job_control == 0 && interactive_shell) || startup_state == 2 || | |
2375 | (startup_state == 0 && WIFSIGNALED (s) == 0)) | |
726f6388 | 2376 | { |
ccc6cda3 | 2377 | if (DEADJOB (job)) |
726f6388 JA |
2378 | jobs[job]->flags |= J_NOTIFIED; |
2379 | continue; | |
2380 | } | |
2381 | ||
ccc6cda3 JA |
2382 | /* Print info on jobs that are running in the background, |
2383 | and on foreground jobs that were killed by anything | |
2384 | except SIGINT. */ | |
726f6388 JA |
2385 | switch (JOBSTATE (job)) |
2386 | { | |
726f6388 | 2387 | case JDEAD: |
ccc6cda3 JA |
2388 | if (interactive_shell == 0 && termsig && WIFSIGNALED (s) && |
2389 | signal_is_trapped (termsig) == 0) | |
2390 | { | |
2391 | fprintf (stderr, "%s: line %d: ", get_name_for_error (), line_number); | |
2392 | pretty_print_job (job, JLIST_NONINTERACTIVE, stderr); | |
2393 | } | |
2394 | else if (IS_FOREGROUND (job)) | |
726f6388 JA |
2395 | { |
2396 | if (termsig && WIFSIGNALED (s) && termsig != SIGINT) | |
2397 | { | |
2398 | fprintf (stderr, "%s", strsignal (termsig)); | |
2399 | ||
2400 | if (WIFCORED (s)) | |
2401 | fprintf (stderr, " (core dumped)"); | |
2402 | ||
2403 | fprintf (stderr, "\n"); | |
2404 | } | |
2405 | } | |
2406 | else | |
2407 | { | |
ccc6cda3 | 2408 | if (dir == 0) |
726f6388 | 2409 | dir = current_working_directory (); |
ccc6cda3 | 2410 | pretty_print_job (job, JLIST_STANDARD, stderr); |
726f6388 JA |
2411 | if (dir && strcmp (dir, jobs[job]->wd) != 0) |
2412 | fprintf (stderr, | |
2413 | "(wd now: %s)\n", polite_directory_format (dir)); | |
2414 | } | |
2415 | ||
2416 | jobs[job]->flags |= J_NOTIFIED; | |
2417 | break; | |
2418 | ||
2419 | case JSTOPPED: | |
2420 | fprintf (stderr, "\n"); | |
ccc6cda3 | 2421 | if (dir == 0) |
726f6388 | 2422 | dir = current_working_directory (); |
ccc6cda3 | 2423 | pretty_print_job (job, JLIST_STANDARD, stderr); |
726f6388 JA |
2424 | if (dir && (strcmp (dir, jobs[job]->wd) != 0)) |
2425 | fprintf (stderr, | |
2426 | "(wd now: %s)\n", polite_directory_format (dir)); | |
2427 | jobs[job]->flags |= J_NOTIFIED; | |
2428 | break; | |
2429 | ||
2430 | case JRUNNING: | |
2431 | case JMIXED: | |
2432 | break; | |
2433 | ||
2434 | default: | |
2435 | programming_error ("notify_of_job_status"); | |
2436 | } | |
2437 | } | |
2438 | } | |
2439 | sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); | |
2440 | } | |
2441 | ||
726f6388 | 2442 | /* Initialize the job control mechanism, and set up the tty stuff. */ |
ccc6cda3 | 2443 | int |
726f6388 JA |
2444 | initialize_jobs () |
2445 | { | |
2446 | shell_pgrp = getpgid (0); | |
2447 | ||
2448 | if (shell_pgrp == -1) | |
2449 | { | |
ccc6cda3 | 2450 | sys_error ("initialize_jobs: getpgrp failed"); |
726f6388 JA |
2451 | exit (1); |
2452 | } | |
2453 | ||
ccc6cda3 JA |
2454 | /* We can only have job control if we are interactive. */ |
2455 | if (interactive == 0) | |
726f6388 JA |
2456 | { |
2457 | job_control = 0; | |
2458 | original_pgrp = NO_PID; | |
2459 | } | |
2460 | else | |
2461 | { | |
726f6388 JA |
2462 | /* Get our controlling terminal. If job_control is set, or |
2463 | interactive is set, then this is an interactive shell no | |
ccc6cda3 JA |
2464 | matter where fd 2 is directed. */ |
2465 | shell_tty = dup (fileno (stderr)); /* fd 2 */ | |
726f6388 | 2466 | |
ccc6cda3 | 2467 | shell_tty = move_to_high_fd (shell_tty, 1); |
726f6388 | 2468 | |
726f6388 | 2469 | /* Compensate for a bug in systems that compiled the BSD |
ccc6cda3 | 2470 | rlogind with DEBUG defined, like NeXT and Alliant. */ |
726f6388 JA |
2471 | if (shell_pgrp == 0) |
2472 | { | |
2473 | shell_pgrp = getpid (); | |
2474 | setpgid (0, shell_pgrp); | |
2475 | tcsetpgrp (shell_tty, shell_pgrp); | |
2476 | } | |
726f6388 JA |
2477 | |
2478 | while ((terminal_pgrp = tcgetpgrp (shell_tty)) != -1) | |
2479 | { | |
2480 | if (shell_pgrp != terminal_pgrp) | |
2481 | { | |
ccc6cda3 JA |
2482 | SigHandler *old_ttin; |
2483 | ||
2484 | old_ttin = set_signal_handler(SIGTTIN, SIG_DFL); | |
726f6388 JA |
2485 | kill (0, SIGTTIN); |
2486 | set_signal_handler (SIGTTIN, old_ttin); | |
2487 | continue; | |
2488 | } | |
2489 | break; | |
2490 | } | |
2491 | ||
ccc6cda3 | 2492 | /* Make sure that we are using the new line discipline. */ |
726f6388 JA |
2493 | if (set_new_line_discipline (shell_tty) < 0) |
2494 | { | |
ccc6cda3 | 2495 | sys_error ("initialize_jobs: line discipline"); |
726f6388 JA |
2496 | job_control = 0; |
2497 | } | |
2498 | else | |
2499 | { | |
2500 | original_pgrp = shell_pgrp; | |
2501 | shell_pgrp = getpid (); | |
2502 | ||
2503 | if ((original_pgrp != shell_pgrp) && (setpgid (0, shell_pgrp) < 0)) | |
2504 | { | |
ccc6cda3 | 2505 | sys_error ("initialize_jobs: setpgid"); |
726f6388 JA |
2506 | shell_pgrp = original_pgrp; |
2507 | } | |
2508 | ||
2509 | job_control = 1; | |
ccc6cda3 JA |
2510 | |
2511 | /* If (and only if) we just set our process group to our pid, | |
2512 | thereby becoming a process group leader, and the terminal | |
2513 | is not in the same process group as our (new) process group, | |
2514 | then set the terminal's process group to our (new) process | |
2515 | group. If that fails, set our process group back to what it | |
2516 | was originally (so we can still read from the terminal) and | |
2517 | turn off job control. */ | |
2518 | if (shell_pgrp != original_pgrp && shell_pgrp != terminal_pgrp) | |
2519 | { | |
2520 | if (give_terminal_to (shell_pgrp) < 0) /* XXX */ | |
2521 | { | |
2522 | setpgid (0, original_pgrp); /* XXX */ | |
2523 | shell_pgrp = original_pgrp; /* XXX */ | |
2524 | job_control = 0; /* XXX */ | |
2525 | } | |
2526 | } | |
726f6388 JA |
2527 | } |
2528 | if (job_control == 0) | |
2529 | internal_error ("no job control in this shell"); /* XXX */ | |
2530 | } | |
2531 | ||
2532 | if (shell_tty != fileno (stderr)) | |
2533 | SET_CLOSE_ON_EXEC (shell_tty); | |
2534 | ||
ccc6cda3 | 2535 | set_signal_handler (SIGCHLD, sigchld_handler); |
726f6388 JA |
2536 | |
2537 | change_flag ('m', job_control ? '-' : '+'); | |
2538 | ||
2539 | if (interactive) | |
2540 | get_tty_state (); | |
ccc6cda3 | 2541 | |
726f6388 JA |
2542 | return job_control; |
2543 | } | |
2544 | ||
2545 | /* Set the line discipline to the best this system has to offer. | |
2546 | Return -1 if this is not possible. */ | |
2547 | static int | |
2548 | set_new_line_discipline (tty) | |
2549 | int tty; | |
2550 | { | |
2551 | #if defined (NEW_TTY_DRIVER) | |
2552 | int ldisc; | |
2553 | ||
2554 | if (ioctl (tty, TIOCGETD, &ldisc) < 0) | |
2555 | return (-1); | |
2556 | ||
2557 | if (ldisc != NTTYDISC) | |
2558 | { | |
2559 | ldisc = NTTYDISC; | |
2560 | ||
2561 | if (ioctl (tty, TIOCSETD, &ldisc) < 0) | |
2562 | return (-1); | |
2563 | } | |
2564 | return (0); | |
2565 | #endif /* NEW_TTY_DRIVER */ | |
2566 | ||
2567 | #if defined (TERMIO_TTY_DRIVER) | |
ccc6cda3 | 2568 | # if defined (TERMIO_LDISC) && (NTTYDISC) |
726f6388 JA |
2569 | if (ioctl (tty, TCGETA, &shell_tty_info) < 0) |
2570 | return (-1); | |
2571 | ||
2572 | if (shell_tty_info.c_line != NTTYDISC) | |
2573 | { | |
2574 | shell_tty_info.c_line = NTTYDISC; | |
2575 | if (ioctl (tty, TCSETAW, &shell_tty_info) < 0) | |
2576 | return (-1); | |
2577 | } | |
ccc6cda3 | 2578 | # endif /* TERMIO_LDISC && NTTYDISC */ |
726f6388 JA |
2579 | return (0); |
2580 | #endif /* TERMIO_TTY_DRIVER */ | |
2581 | ||
2582 | #if defined (TERMIOS_TTY_DRIVER) | |
ccc6cda3 | 2583 | # if defined (TERMIOS_LDISC) && defined (NTTYDISC) |
726f6388 JA |
2584 | if (tcgetattr (tty, &shell_tty_info) < 0) |
2585 | return (-1); | |
2586 | ||
2587 | if (shell_tty_info.c_line != NTTYDISC) | |
2588 | { | |
2589 | shell_tty_info.c_line = NTTYDISC; | |
2590 | if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0) | |
2591 | return (-1); | |
2592 | } | |
ccc6cda3 | 2593 | # endif /* TERMIOS_LDISC && NTTYDISC */ |
726f6388 JA |
2594 | return (0); |
2595 | #endif /* TERMIOS_TTY_DRIVER */ | |
2596 | ||
2597 | #if !defined (NEW_TTY_DRIVER) && !defined (TERMIO_TTY_DRIVER) && !defined (TERMIOS_TTY_DRIVER) | |
2598 | return (-1); | |
2599 | #endif | |
2600 | } | |
2601 | ||
2602 | static SigHandler *old_tstp, *old_ttou, *old_ttin; | |
2603 | static SigHandler *old_cont = (SigHandler *)SIG_DFL; | |
2604 | static sighandler stop_signal_handler (), cont_signal_handler (); | |
2605 | ||
ccc6cda3 JA |
2606 | #if defined (TIOCGWINSZ) && defined (SIGWINCH) |
2607 | static SigHandler *old_winch = (SigHandler *)SIG_DFL; | |
726f6388 | 2608 | |
ccc6cda3 JA |
2609 | static void |
2610 | get_new_window_size (from_sig) | |
2611 | int from_sig; | |
726f6388 JA |
2612 | { |
2613 | struct winsize win; | |
2614 | ||
726f6388 JA |
2615 | if ((ioctl (shell_tty, TIOCGWINSZ, &win) == 0) && |
2616 | win.ws_row > 0 && win.ws_col > 0) | |
2617 | { | |
2618 | #if defined (aixpc) | |
2619 | shell_tty_info.c_winsize = win; /* structure copying */ | |
2620 | #endif | |
2621 | set_lines_and_columns (win.ws_row, win.ws_col); | |
ccc6cda3 JA |
2622 | #if defined (READLINE) |
2623 | _rl_set_screen_size (win.ws_row, win.ws_col); | |
2624 | #endif | |
726f6388 JA |
2625 | } |
2626 | } | |
ccc6cda3 JA |
2627 | |
2628 | static sighandler | |
2629 | sigwinch_sighandler (sig) | |
2630 | int sig; | |
2631 | { | |
2632 | #if defined (MUST_REINSTALL_SIGHANDLERS) | |
2633 | set_signal_handler (SIGWINCH, sigwinch_sighandler); | |
2634 | #endif /* MUST_REINSTALL_SIGHANDLERS */ | |
2635 | get_new_window_size (1); | |
2636 | } | |
2637 | #else | |
2638 | static void | |
2639 | get_new_window_size (from_sig) | |
2640 | int from_sig; | |
2641 | { | |
2642 | } | |
2643 | #endif /* TIOCGWINSZ && SIGWINCH */ | |
2644 | ||
2645 | void | |
2646 | set_sigwinch_handler () | |
2647 | { | |
2648 | #if defined (TIOCGWINSZ) && defined (SIGWINCH) | |
2649 | old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler); | |
2650 | #endif | |
2651 | } | |
2652 | ||
2653 | void | |
2654 | unset_sigwinch_handler () | |
2655 | { | |
2656 | #if defined (TIOCGWINSZ) && defined (SIGWINCH) | |
2657 | set_signal_handler (SIGWINCH, old_winch); | |
2658 | #endif | |
2659 | } | |
726f6388 JA |
2660 | |
2661 | /* Setup this shell to handle C-C, etc. */ | |
2662 | void | |
2663 | initialize_job_signals () | |
2664 | { | |
2665 | if (interactive) | |
2666 | { | |
2667 | set_signal_handler (SIGINT, sigint_sighandler); | |
2668 | set_signal_handler (SIGTSTP, SIG_IGN); | |
2669 | set_signal_handler (SIGTTOU, SIG_IGN); | |
2670 | set_signal_handler (SIGTTIN, SIG_IGN); | |
ccc6cda3 | 2671 | set_sigwinch_handler (); |
726f6388 JA |
2672 | } |
2673 | else if (job_control) | |
2674 | { | |
2675 | old_tstp = set_signal_handler (SIGTSTP, stop_signal_handler); | |
2676 | old_ttou = set_signal_handler (SIGTTOU, stop_signal_handler); | |
2677 | old_ttin = set_signal_handler (SIGTTIN, stop_signal_handler); | |
2678 | } | |
2679 | /* Leave these things alone for non-interactive shells without job | |
2680 | control. */ | |
2681 | } | |
2682 | ||
2683 | /* Here we handle CONT signals. */ | |
2684 | static sighandler | |
2685 | cont_signal_handler (sig) | |
2686 | int sig; | |
2687 | { | |
2688 | initialize_job_signals (); | |
2689 | set_signal_handler (SIGCONT, old_cont); | |
2690 | kill (getpid (), SIGCONT); | |
2691 | ||
ccc6cda3 | 2692 | SIGRETURN (0); |
726f6388 JA |
2693 | } |
2694 | ||
2695 | /* Here we handle stop signals while we are running not as a login shell. */ | |
2696 | static sighandler | |
2697 | stop_signal_handler (sig) | |
2698 | int sig; | |
2699 | { | |
2700 | set_signal_handler (SIGTSTP, old_tstp); | |
2701 | set_signal_handler (SIGTTOU, old_ttou); | |
2702 | set_signal_handler (SIGTTIN, old_ttin); | |
2703 | ||
2704 | old_cont = set_signal_handler (SIGCONT, cont_signal_handler); | |
2705 | ||
2706 | give_terminal_to (shell_pgrp); | |
2707 | ||
2708 | kill (getpid (), sig); | |
2709 | ||
ccc6cda3 | 2710 | SIGRETURN (0); |
726f6388 JA |
2711 | } |
2712 | ||
2713 | /* Give the terminal to PGRP. */ | |
ccc6cda3 | 2714 | int |
726f6388 JA |
2715 | give_terminal_to (pgrp) |
2716 | pid_t pgrp; | |
2717 | { | |
2718 | sigset_t set, oset; | |
ccc6cda3 | 2719 | int r; |
726f6388 | 2720 | |
ccc6cda3 | 2721 | r = 0; |
726f6388 JA |
2722 | if (job_control) |
2723 | { | |
2724 | sigemptyset (&set); | |
2725 | sigaddset (&set, SIGTTOU); | |
2726 | sigaddset (&set, SIGTTIN); | |
2727 | sigaddset (&set, SIGTSTP); | |
2728 | sigaddset (&set, SIGCHLD); | |
2729 | sigemptyset (&oset); | |
2730 | sigprocmask (SIG_BLOCK, &set, &oset); | |
2731 | ||
2732 | if (tcsetpgrp (shell_tty, pgrp) < 0) | |
2733 | { | |
2734 | /* Maybe we should print an error message? */ | |
ccc6cda3 JA |
2735 | #if 0 |
2736 | sys_error ("tcsetpgrp(%d) failed: pid %d to pgrp %d", | |
2737 | shell_tty, getpid(), pgrp); | |
2738 | #endif | |
726f6388 JA |
2739 | r = -1; |
2740 | } | |
2741 | else | |
2742 | terminal_pgrp = pgrp; | |
726f6388 JA |
2743 | sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); |
2744 | } | |
2745 | ||
2746 | return r; | |
2747 | } | |
2748 | ||
2749 | /* Clear out any jobs in the job array. This is intended to be used by | |
2750 | children of the shell, who should not have any job structures as baggage | |
2751 | when they start executing (forking subshells for parenthesized execution | |
2752 | and functions with pipes are the two that spring to mind). */ | |
2753 | static void | |
2754 | delete_all_jobs () | |
2755 | { | |
2756 | register int i; | |
2757 | sigset_t set, oset; | |
2758 | ||
ccc6cda3 JA |
2759 | BLOCK_CHILD (set, oset); |
2760 | ||
726f6388 JA |
2761 | if (job_slots) |
2762 | { | |
ccc6cda3 | 2763 | current_job = previous_job = NO_JOB; |
726f6388 | 2764 | |
ccc6cda3 JA |
2765 | for (i = 0; i < job_slots; i++) |
2766 | if (jobs[i]) | |
2767 | delete_job (i); | |
726f6388 | 2768 | |
ccc6cda3 JA |
2769 | free ((char *)jobs); |
2770 | job_slots = 0; | |
726f6388 | 2771 | } |
ccc6cda3 JA |
2772 | |
2773 | UNBLOCK_CHILD (oset); | |
726f6388 JA |
2774 | } |
2775 | ||
2776 | /* Mark all dead jobs as notified, so delete_job () cleans them out | |
2777 | of the job table properly. */ | |
2778 | static void | |
2779 | mark_dead_jobs_as_notified () | |
2780 | { | |
2781 | register int i; | |
2782 | sigset_t set, oset; | |
2783 | ||
2784 | if (job_slots) | |
2785 | { | |
2786 | BLOCK_CHILD (set, oset); | |
2787 | ||
2788 | for (i = 0; i < job_slots; i++) | |
ccc6cda3 | 2789 | if (jobs[i] && DEADJOB (i)) |
726f6388 JA |
2790 | jobs[i]->flags |= J_NOTIFIED; |
2791 | ||
2792 | UNBLOCK_CHILD (oset); | |
2793 | } | |
2794 | } | |
2795 | ||
ccc6cda3 JA |
2796 | /* Here to allow other parts of the shell (like the trap stuff) to |
2797 | unfreeze the jobs list. */ | |
2798 | void | |
2799 | unfreeze_jobs_list () | |
2800 | { | |
2801 | jobs_list_frozen = 0; | |
2802 | } | |
2803 | ||
726f6388 JA |
2804 | /* Allow or disallow job control to take place. Returns the old value |
2805 | of job_control. */ | |
2806 | int | |
2807 | set_job_control (arg) | |
2808 | int arg; | |
2809 | { | |
2810 | int old; | |
2811 | ||
2812 | old = job_control; | |
2813 | job_control = arg; | |
2814 | return (old); | |
2815 | } | |
2816 | ||
2817 | /* Turn off all traces of job control. This is run by children of the shell | |
2818 | which are going to do shellsy things, like wait (), etc. */ | |
2819 | void | |
2820 | without_job_control () | |
2821 | { | |
2822 | stop_making_children (); | |
2823 | start_pipeline (); | |
2824 | delete_all_jobs (); | |
2825 | set_job_control (0); | |
2826 | } | |
2827 | ||
2828 | /* If this shell is interactive, terminate all stopped jobs and | |
2829 | restore the original terminal process group. This is done | |
2830 | before the `exec' builtin calls shell_execve. */ | |
2831 | void | |
2832 | end_job_control () | |
2833 | { | |
2834 | if (interactive_shell) /* XXX - should it be interactive? */ | |
2835 | { | |
2836 | terminate_stopped_jobs (); | |
2837 | ||
2838 | if (original_pgrp >= 0) | |
2839 | give_terminal_to (original_pgrp); | |
2840 | } | |
2841 | ||
2842 | if (original_pgrp >= 0) | |
2843 | setpgid (0, original_pgrp); | |
2844 | } | |
2845 | ||
2846 | /* Restart job control by closing shell tty and reinitializing. This is | |
2847 | called after an exec fails in an interactive shell and we do not exit. */ | |
2848 | void | |
2849 | restart_job_control () | |
2850 | { | |
2851 | if (shell_tty != -1) | |
2852 | close (shell_tty); | |
2853 | initialize_jobs (); | |
2854 | } | |
2855 | ||
2856 | /* Set the handler to run when the shell receives a SIGCHLD signal. */ | |
2857 | void | |
2858 | set_sigchld_handler () | |
2859 | { | |
ccc6cda3 | 2860 | set_signal_handler (SIGCHLD, sigchld_handler); |
726f6388 JA |
2861 | } |
2862 | ||
2863 | #if defined (PGRP_PIPE) | |
2864 | /* Read from the read end of a pipe. This is how the process group leader | |
2865 | blocks until all of the processes in a pipeline have been made. */ | |
2866 | static void | |
2867 | pipe_read (pp) | |
2868 | int *pp; | |
2869 | { | |
2870 | char ch; | |
2871 | ||
2872 | if (pp[1] >= 0) | |
2873 | { | |
2874 | close (pp[1]); | |
2875 | pp[1] = -1; | |
2876 | } | |
2877 | ||
2878 | if (pp[0] >= 0) | |
2879 | { | |
2880 | while (read (pp[0], &ch, 1) == -1 && errno == EINTR) | |
2881 | continue; | |
2882 | } | |
2883 | } | |
2884 | ||
2885 | /* Close the read and write ends of PP, an array of file descriptors. */ | |
2886 | static void | |
2887 | pipe_close (pp) | |
2888 | int *pp; | |
2889 | { | |
2890 | if (pp[0] >= 0) | |
2891 | close (pp[0]); | |
2892 | ||
2893 | if (pp[1] >= 0) | |
2894 | close (pp[1]); | |
2895 | ||
2896 | pp[0] = pp[1] = -1; | |
2897 | } | |
2898 | ||
2899 | /* Functional interface closes our local-to-job-control pipes. */ | |
ccc6cda3 | 2900 | void |
726f6388 JA |
2901 | close_pgrp_pipe () |
2902 | { | |
2903 | pipe_close (pgrp_pipe); | |
2904 | } | |
2905 | ||
2906 | #endif /* PGRP_PIPE */ | |
2907 | ||
ccc6cda3 JA |
2908 | static void |
2909 | setjstatus (j) | |
2910 | int j; | |
2911 | { | |
2912 | #if defined (ARRAY_VARS) | |
2913 | register int i; | |
2914 | register PROCESS *p; | |
2915 | ||
2916 | for (i = 1, p = jobs[j]->pipe; p->next != jobs[j]->pipe; p = p->next, i++) | |
2917 | ; | |
2918 | i++; | |
2919 | if (statsize <= i) | |
2920 | { | |
2921 | pstatuses = (int *)xrealloc (pstatuses, i * sizeof (int)); | |
2922 | statsize = i; | |
2923 | } | |
2924 | i = 0; | |
2925 | p = jobs[j]->pipe; | |
2926 | do | |
2927 | { | |
2928 | pstatuses[i++] = process_exit_status (p->status); | |
2929 | p = p->next; | |
2930 | } | |
2931 | while (p != jobs[j]->pipe); | |
2932 | ||
2933 | pstatuses[i] = -1; /* sentinel */ | |
2934 | set_pipestatus_array (pstatuses); | |
2935 | #endif | |
2936 | } | |
2937 | ||
2938 | #if defined (ARRAY_VARS) | |
2939 | static void | |
2940 | set_pipestatus_array (ps) | |
2941 | int *ps; | |
2942 | { | |
2943 | SHELL_VAR *v; | |
2944 | ARRAY *a; | |
2945 | register int i; | |
2946 | char *t; | |
2947 | ||
2948 | v = find_variable ("PIPESTATUS"); | |
2949 | if (v == 0) | |
2950 | v = make_new_array_variable ("PIPESTATUS"); | |
2951 | if (array_p (v) == 0) | |
2952 | return; /* Do nothing if not an array variable. */ | |
2953 | a = array_cell (v); | |
2954 | if (a) | |
2955 | empty_array (a); | |
2956 | for (i = 0; ps[i] != -1; i++) | |
2957 | { | |
2958 | t = itos (ps[i]); | |
2959 | array_add_element (a, i, t); | |
2960 | free (t); | |
2961 | } | |
2962 | } | |
2963 | #endif |