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Commit | Line | Data |
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ccc6cda3 JA |
1 | /* sig.c - interface for shell signal handlers and signal initialization. */ |
2 | ||
3185942a | 3 | /* Copyright (C) 1994-2009 Free Software Foundation, Inc. |
ccc6cda3 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
ccc6cda3 | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
ccc6cda3 | 16 | |
3185942a JA |
17 | You should have received a copy of the GNU General Public License |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
ccc6cda3 JA |
20 | |
21 | #include "config.h" | |
22 | ||
23 | #include "bashtypes.h" | |
24 | ||
25 | #if defined (HAVE_UNISTD_H) | |
cce855bc JA |
26 | # ifdef _MINIX |
27 | # include <sys/types.h> | |
28 | # endif | |
ccc6cda3 JA |
29 | # include <unistd.h> |
30 | #endif | |
31 | ||
32 | #include <stdio.h> | |
33 | #include <signal.h> | |
34 | ||
b80f6443 JA |
35 | #include "bashintl.h" |
36 | ||
ccc6cda3 JA |
37 | #include "shell.h" |
38 | #if defined (JOB_CONTROL) | |
39 | #include "jobs.h" | |
40 | #endif /* JOB_CONTROL */ | |
41 | #include "siglist.h" | |
42 | #include "sig.h" | |
43 | #include "trap.h" | |
44 | ||
45 | #include "builtins/common.h" | |
46 | ||
47 | #if defined (READLINE) | |
48 | # include "bashline.h" | |
49 | #endif | |
50 | ||
51 | #if defined (HISTORY) | |
52 | # include "bashhist.h" | |
53 | #endif | |
54 | ||
55 | extern int last_command_exit_value; | |
b80f6443 | 56 | extern int last_command_exit_signal; |
ccc6cda3 JA |
57 | extern int return_catch_flag; |
58 | extern int loop_level, continuing, breaking; | |
3185942a JA |
59 | extern int executing_list; |
60 | extern int comsub_ignore_return; | |
ccc6cda3 | 61 | extern int parse_and_execute_level, shell_initialized; |
ccc6cda3 JA |
62 | |
63 | /* Non-zero after SIGINT. */ | |
0628567a | 64 | volatile int interrupt_state = 0; |
ccc6cda3 | 65 | |
95732b49 JA |
66 | /* Non-zero after SIGWINCH */ |
67 | volatile int sigwinch_received = 0; | |
68 | ||
0628567a JA |
69 | /* Set to the value of any terminating signal received. */ |
70 | volatile int terminating_signal = 0; | |
71 | ||
ccc6cda3 JA |
72 | /* The environment at the top-level R-E loop. We use this in |
73 | the case of error return. */ | |
74 | procenv_t top_level; | |
75 | ||
76 | #if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS) | |
77 | /* The signal masks that this shell runs with. */ | |
78 | sigset_t top_level_mask; | |
79 | #endif /* JOB_CONTROL */ | |
80 | ||
81 | /* When non-zero, we throw_to_top_level (). */ | |
82 | int interrupt_immediately = 0; | |
83 | ||
0628567a JA |
84 | /* When non-zero, we call the terminating signal handler immediately. */ |
85 | int terminate_immediately = 0; | |
86 | ||
95732b49 JA |
87 | #if defined (SIGWINCH) |
88 | static SigHandler *old_winch = (SigHandler *)SIG_DFL; | |
89 | #endif | |
90 | ||
f73dda09 | 91 | static void initialize_shell_signals __P((void)); |
ccc6cda3 JA |
92 | |
93 | void | |
7117c2d2 JA |
94 | initialize_signals (reinit) |
95 | int reinit; | |
ccc6cda3 | 96 | { |
d166f048 | 97 | initialize_shell_signals (); |
ccc6cda3 | 98 | initialize_job_signals (); |
e8ce775d | 99 | #if !defined (HAVE_SYS_SIGLIST) && !defined (HAVE_UNDER_SYS_SIGLIST) && !defined (HAVE_STRSIGNAL) |
7117c2d2 JA |
100 | if (reinit == 0) |
101 | initialize_siglist (); | |
e8ce775d | 102 | #endif /* !HAVE_SYS_SIGLIST && !HAVE_UNDER_SYS_SIGLIST && !HAVE_STRSIGNAL */ |
ccc6cda3 JA |
103 | } |
104 | ||
ccc6cda3 JA |
105 | /* A structure describing a signal that terminates the shell if not |
106 | caught. The orig_handler member is present so children can reset | |
107 | these signals back to their original handlers. */ | |
108 | struct termsig { | |
109 | int signum; | |
110 | SigHandler *orig_handler; | |
95732b49 | 111 | int orig_flags; |
ccc6cda3 JA |
112 | }; |
113 | ||
114 | #define NULL_HANDLER (SigHandler *)SIG_DFL | |
115 | ||
116 | /* The list of signals that would terminate the shell if not caught. | |
117 | We catch them, but just so that we can write the history file, | |
118 | and so forth. */ | |
119 | static struct termsig terminating_signals[] = { | |
120 | #ifdef SIGHUP | |
95732b49 | 121 | { SIGHUP, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
122 | #endif |
123 | ||
124 | #ifdef SIGINT | |
95732b49 | 125 | { SIGINT, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
126 | #endif |
127 | ||
128 | #ifdef SIGILL | |
95732b49 | 129 | { SIGILL, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
130 | #endif |
131 | ||
132 | #ifdef SIGTRAP | |
95732b49 | 133 | { SIGTRAP, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
134 | #endif |
135 | ||
136 | #ifdef SIGIOT | |
95732b49 | 137 | { SIGIOT, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
138 | #endif |
139 | ||
140 | #ifdef SIGDANGER | |
95732b49 | 141 | { SIGDANGER, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
142 | #endif |
143 | ||
144 | #ifdef SIGEMT | |
95732b49 | 145 | { SIGEMT, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
146 | #endif |
147 | ||
148 | #ifdef SIGFPE | |
95732b49 | 149 | { SIGFPE, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
150 | #endif |
151 | ||
152 | #ifdef SIGBUS | |
95732b49 | 153 | { SIGBUS, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
154 | #endif |
155 | ||
156 | #ifdef SIGSEGV | |
95732b49 | 157 | { SIGSEGV, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
158 | #endif |
159 | ||
160 | #ifdef SIGSYS | |
95732b49 | 161 | { SIGSYS, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
162 | #endif |
163 | ||
164 | #ifdef SIGPIPE | |
95732b49 | 165 | { SIGPIPE, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
166 | #endif |
167 | ||
168 | #ifdef SIGALRM | |
95732b49 | 169 | { SIGALRM, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
170 | #endif |
171 | ||
172 | #ifdef SIGTERM | |
95732b49 | 173 | { SIGTERM, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
174 | #endif |
175 | ||
176 | #ifdef SIGXCPU | |
95732b49 | 177 | { SIGXCPU, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
178 | #endif |
179 | ||
180 | #ifdef SIGXFSZ | |
95732b49 | 181 | { SIGXFSZ, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
182 | #endif |
183 | ||
184 | #ifdef SIGVTALRM | |
95732b49 | 185 | { SIGVTALRM, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
186 | #endif |
187 | ||
bb70624e | 188 | #if 0 |
ccc6cda3 | 189 | #ifdef SIGPROF |
95732b49 | 190 | { SIGPROF, NULL_HANDLER, 0 }, |
ccc6cda3 | 191 | #endif |
bb70624e | 192 | #endif |
ccc6cda3 JA |
193 | |
194 | #ifdef SIGLOST | |
95732b49 | 195 | { SIGLOST, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
196 | #endif |
197 | ||
198 | #ifdef SIGUSR1 | |
95732b49 | 199 | { SIGUSR1, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
200 | #endif |
201 | ||
202 | #ifdef SIGUSR2 | |
95732b49 | 203 | { SIGUSR2, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
204 | #endif |
205 | }; | |
206 | ||
207 | #define TERMSIGS_LENGTH (sizeof (terminating_signals) / sizeof (struct termsig)) | |
208 | ||
209 | #define XSIG(x) (terminating_signals[x].signum) | |
210 | #define XHANDLER(x) (terminating_signals[x].orig_handler) | |
95732b49 | 211 | #define XSAFLAGS(x) (terminating_signals[x].orig_flags) |
ccc6cda3 | 212 | |
d166f048 JA |
213 | static int termsigs_initialized = 0; |
214 | ||
ccc6cda3 | 215 | /* Initialize signals that will terminate the shell to do some |
d166f048 JA |
216 | unwind protection. For non-interactive shells, we only call |
217 | this when a trap is defined for EXIT (0). */ | |
218 | void | |
ccc6cda3 JA |
219 | initialize_terminating_signals () |
220 | { | |
221 | register int i; | |
d166f048 JA |
222 | #if defined (HAVE_POSIX_SIGNALS) |
223 | struct sigaction act, oact; | |
224 | #endif | |
225 | ||
226 | if (termsigs_initialized) | |
227 | return; | |
ccc6cda3 JA |
228 | |
229 | /* The following code is to avoid an expensive call to | |
230 | set_signal_handler () for each terminating_signals. Fortunately, | |
231 | this is possible in Posix. Unfortunately, we have to call signal () | |
232 | on non-Posix systems for each signal in terminating_signals. */ | |
233 | #if defined (HAVE_POSIX_SIGNALS) | |
0628567a | 234 | act.sa_handler = termsig_sighandler; |
ccc6cda3 JA |
235 | act.sa_flags = 0; |
236 | sigemptyset (&act.sa_mask); | |
237 | sigemptyset (&oact.sa_mask); | |
238 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
239 | sigaddset (&act.sa_mask, XSIG (i)); | |
240 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
241 | { | |
7117c2d2 JA |
242 | /* If we've already trapped it, don't do anything. */ |
243 | if (signal_is_trapped (XSIG (i))) | |
244 | continue; | |
245 | ||
ccc6cda3 | 246 | sigaction (XSIG (i), &act, &oact); |
d166f048 | 247 | XHANDLER(i) = oact.sa_handler; |
95732b49 | 248 | XSAFLAGS(i) = oact.sa_flags; |
ccc6cda3 JA |
249 | /* Don't do anything with signals that are ignored at shell entry |
250 | if the shell is not interactive. */ | |
d166f048 | 251 | if (!interactive_shell && XHANDLER (i) == SIG_IGN) |
28ef6c31 | 252 | { |
ccc6cda3 JA |
253 | sigaction (XSIG (i), &oact, &act); |
254 | set_signal_ignored (XSIG (i)); | |
28ef6c31 | 255 | } |
cce855bc | 256 | #if defined (SIGPROF) && !defined (_MINIX) |
d166f048 | 257 | if (XSIG (i) == SIGPROF && XHANDLER (i) != SIG_DFL && XHANDLER (i) != SIG_IGN) |
28ef6c31 | 258 | sigaction (XSIG (i), &oact, (struct sigaction *)NULL); |
cce855bc | 259 | #endif /* SIGPROF && !_MINIX */ |
ccc6cda3 JA |
260 | } |
261 | ||
262 | #else /* !HAVE_POSIX_SIGNALS */ | |
263 | ||
264 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
265 | { | |
7117c2d2 JA |
266 | /* If we've already trapped it, don't do anything. */ |
267 | if (signal_is_trapped (XSIG (i))) | |
268 | continue; | |
269 | ||
0628567a | 270 | XHANDLER(i) = signal (XSIG (i), termsig_sighandler); |
95732b49 | 271 | XSAFLAGS(i) = 0; |
ccc6cda3 JA |
272 | /* Don't do anything with signals that are ignored at shell entry |
273 | if the shell is not interactive. */ | |
d166f048 | 274 | if (!interactive_shell && XHANDLER (i) == SIG_IGN) |
ccc6cda3 | 275 | { |
28ef6c31 JA |
276 | signal (XSIG (i), SIG_IGN); |
277 | set_signal_ignored (XSIG (i)); | |
ccc6cda3 | 278 | } |
cce855bc | 279 | #ifdef SIGPROF |
d166f048 | 280 | if (XSIG (i) == SIGPROF && XHANDLER (i) != SIG_DFL && XHANDLER (i) != SIG_IGN) |
28ef6c31 | 281 | signal (XSIG (i), XHANDLER (i)); |
cce855bc | 282 | #endif |
ccc6cda3 JA |
283 | } |
284 | ||
285 | #endif /* !HAVE_POSIX_SIGNALS */ | |
286 | ||
d166f048 JA |
287 | termsigs_initialized = 1; |
288 | } | |
289 | ||
290 | static void | |
291 | initialize_shell_signals () | |
292 | { | |
293 | if (interactive) | |
294 | initialize_terminating_signals (); | |
295 | ||
ccc6cda3 JA |
296 | #if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS) |
297 | /* All shells use the signal mask they inherit, and pass it along | |
298 | to child processes. Children will never block SIGCHLD, though. */ | |
299 | sigemptyset (&top_level_mask); | |
300 | sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &top_level_mask); | |
bb70624e | 301 | # if defined (SIGCHLD) |
ccc6cda3 | 302 | sigdelset (&top_level_mask, SIGCHLD); |
bb70624e | 303 | # endif |
ccc6cda3 JA |
304 | #endif /* JOB_CONTROL || HAVE_POSIX_SIGNALS */ |
305 | ||
306 | /* And, some signals that are specifically ignored by the shell. */ | |
307 | set_signal_handler (SIGQUIT, SIG_IGN); | |
308 | ||
309 | if (interactive) | |
310 | { | |
311 | set_signal_handler (SIGINT, sigint_sighandler); | |
312 | set_signal_handler (SIGTERM, SIG_IGN); | |
95732b49 | 313 | set_sigwinch_handler (); |
ccc6cda3 JA |
314 | } |
315 | } | |
316 | ||
317 | void | |
318 | reset_terminating_signals () | |
319 | { | |
320 | register int i; | |
ccc6cda3 JA |
321 | #if defined (HAVE_POSIX_SIGNALS) |
322 | struct sigaction act; | |
d166f048 | 323 | #endif |
ccc6cda3 | 324 | |
d166f048 JA |
325 | if (termsigs_initialized == 0) |
326 | return; | |
327 | ||
328 | #if defined (HAVE_POSIX_SIGNALS) | |
ccc6cda3 JA |
329 | act.sa_flags = 0; |
330 | sigemptyset (&act.sa_mask); | |
331 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
332 | { | |
333 | /* Skip a signal if it's trapped or handled specially, because the | |
334 | trap code will restore the correct value. */ | |
335 | if (signal_is_trapped (XSIG (i)) || signal_is_special (XSIG (i))) | |
336 | continue; | |
337 | ||
338 | act.sa_handler = XHANDLER (i); | |
95732b49 | 339 | act.sa_flags = XSAFLAGS (i); |
ccc6cda3 JA |
340 | sigaction (XSIG (i), &act, (struct sigaction *) NULL); |
341 | } | |
342 | #else /* !HAVE_POSIX_SIGNALS */ | |
343 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
344 | { | |
345 | if (signal_is_trapped (XSIG (i)) || signal_is_special (XSIG (i))) | |
346 | continue; | |
347 | ||
348 | signal (XSIG (i), XHANDLER (i)); | |
349 | } | |
350 | #endif /* !HAVE_POSIX_SIGNALS */ | |
351 | } | |
352 | #undef XSIG | |
353 | #undef XHANDLER | |
354 | ||
f1be666c JA |
355 | /* Run some of the cleanups that should be performed when we run |
356 | jump_to_top_level from a builtin command context. XXX - might want to | |
357 | also call reset_parser here. */ | |
358 | void | |
359 | top_level_cleanup () | |
360 | { | |
361 | /* Clean up string parser environment. */ | |
362 | while (parse_and_execute_level) | |
363 | parse_and_execute_cleanup (); | |
364 | ||
365 | #if defined (PROCESS_SUBSTITUTION) | |
366 | unlink_fifo_list (); | |
367 | #endif /* PROCESS_SUBSTITUTION */ | |
368 | ||
369 | run_unwind_protects (); | |
370 | loop_level = continuing = breaking = 0; | |
3185942a | 371 | executing_list = comsub_ignore_return = return_catch_flag = 0; |
f1be666c JA |
372 | } |
373 | ||
ccc6cda3 JA |
374 | /* What to do when we've been interrupted, and it is safe to handle it. */ |
375 | void | |
376 | throw_to_top_level () | |
377 | { | |
378 | int print_newline = 0; | |
379 | ||
380 | if (interrupt_state) | |
381 | { | |
382 | print_newline = 1; | |
383 | DELINTERRUPT; | |
384 | } | |
385 | ||
386 | if (interrupt_state) | |
387 | return; | |
388 | ||
b80f6443 JA |
389 | last_command_exit_signal = (last_command_exit_value > 128) ? |
390 | (last_command_exit_value - 128) : 0; | |
ccc6cda3 JA |
391 | last_command_exit_value |= 128; |
392 | ||
393 | /* Run any traps set on SIGINT. */ | |
394 | run_interrupt_trap (); | |
395 | ||
3185942a | 396 | /* Clean up string parser environment. */ |
ccc6cda3 JA |
397 | while (parse_and_execute_level) |
398 | parse_and_execute_cleanup (); | |
399 | ||
400 | #if defined (JOB_CONTROL) | |
28ef6c31 | 401 | give_terminal_to (shell_pgrp, 0); |
ccc6cda3 JA |
402 | #endif /* JOB_CONTROL */ |
403 | ||
404 | #if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS) | |
405 | /* This should not be necessary on systems using sigsetjmp/siglongjmp. */ | |
406 | sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL); | |
407 | #endif | |
408 | ||
409 | reset_parser (); | |
410 | ||
411 | #if defined (READLINE) | |
412 | if (interactive) | |
3185942a | 413 | bashline_reset (); |
ccc6cda3 JA |
414 | #endif /* READLINE */ |
415 | ||
416 | #if defined (PROCESS_SUBSTITUTION) | |
417 | unlink_fifo_list (); | |
418 | #endif /* PROCESS_SUBSTITUTION */ | |
419 | ||
420 | run_unwind_protects (); | |
421 | loop_level = continuing = breaking = 0; | |
3185942a | 422 | executing_list = comsub_ignore_return = return_catch_flag = 0; |
ccc6cda3 JA |
423 | |
424 | if (interactive && print_newline) | |
425 | { | |
426 | fflush (stdout); | |
427 | fprintf (stderr, "\n"); | |
428 | fflush (stderr); | |
429 | } | |
430 | ||
431 | /* An interrupted `wait' command in a script does not exit the script. */ | |
432 | if (interactive || (interactive_shell && !shell_initialized) || | |
433 | (print_newline && signal_is_trapped (SIGINT))) | |
434 | jump_to_top_level (DISCARD); | |
435 | else | |
436 | jump_to_top_level (EXITPROG); | |
437 | } | |
438 | ||
439 | /* This is just here to isolate the longjmp calls. */ | |
440 | void | |
441 | jump_to_top_level (value) | |
442 | int value; | |
443 | { | |
444 | longjmp (top_level, value); | |
445 | } | |
446 | ||
447 | sighandler | |
0628567a | 448 | termsig_sighandler (sig) |
ccc6cda3 JA |
449 | int sig; |
450 | { | |
89a92869 CR |
451 | /* If we get called twice with the same signal before handling it, |
452 | terminate right away. */ | |
453 | if ( | |
454 | #ifdef SIGHUP | |
455 | sig != SIGHUP && | |
456 | #endif | |
457 | #ifdef SIGINT | |
458 | sig != SIGINT && | |
459 | #endif | |
460 | #ifdef SIGDANGER | |
461 | sig != SIGDANGER && | |
462 | #endif | |
463 | #ifdef SIGPIPE | |
464 | sig != SIGPIPE && | |
465 | #endif | |
466 | #ifdef SIGALRM | |
467 | sig != SIGALRM && | |
468 | #endif | |
469 | #ifdef SIGTERM | |
470 | sig != SIGTERM && | |
471 | #endif | |
472 | #ifdef SIGXCPU | |
473 | sig != SIGXCPU && | |
474 | #endif | |
475 | #ifdef SIGXFSZ | |
476 | sig != SIGXFSZ && | |
477 | #endif | |
478 | #ifdef SIGVTALRM | |
479 | sig != SIGVTALRM && | |
480 | #endif | |
481 | #ifdef SIGLOST | |
482 | sig != SIGLOST && | |
483 | #endif | |
484 | #ifdef SIGUSR1 | |
485 | sig != SIGUSR1 && | |
486 | #endif | |
487 | #ifdef SIGUSR2 | |
488 | sig != SIGUSR2 && | |
489 | #endif | |
490 | sig == terminating_signal) | |
491 | terminate_immediately = 1; | |
492 | ||
0628567a JA |
493 | terminating_signal = sig; |
494 | ||
3185942a | 495 | /* XXX - should this also trigger when interrupt_immediately is set? */ |
0628567a JA |
496 | if (terminate_immediately) |
497 | { | |
498 | terminate_immediately = 0; | |
499 | termsig_handler (sig); | |
500 | } | |
501 | ||
502 | SIGRETURN (0); | |
503 | } | |
504 | ||
505 | void | |
506 | termsig_handler (sig) | |
507 | int sig; | |
508 | { | |
509 | static int handling_termsig = 0; | |
510 | ||
511 | /* Simple semaphore to keep this function from being executed multiple | |
512 | times. Since we no longer are running as a signal handler, we don't | |
513 | block multiple occurrences of the terminating signals while running. */ | |
514 | if (handling_termsig) | |
515 | return; | |
516 | handling_termsig = 1; | |
517 | terminating_signal = 0; /* keep macro from re-testing true. */ | |
518 | ||
95732b49 | 519 | /* I don't believe this condition ever tests true. */ |
ccc6cda3 JA |
520 | if (sig == SIGINT && signal_is_trapped (SIGINT)) |
521 | run_interrupt_trap (); | |
522 | ||
523 | #if defined (HISTORY) | |
524 | if (interactive_shell && sig != SIGABRT) | |
525 | maybe_save_shell_history (); | |
526 | #endif /* HISTORY */ | |
527 | ||
528 | #if defined (JOB_CONTROL) | |
0001803f | 529 | if (sig == SIGHUP && (interactive || (subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PROCSUB)))) |
ccc6cda3 JA |
530 | hangup_all_jobs (); |
531 | end_job_control (); | |
532 | #endif /* JOB_CONTROL */ | |
533 | ||
534 | #if defined (PROCESS_SUBSTITUTION) | |
535 | unlink_fifo_list (); | |
536 | #endif /* PROCESS_SUBSTITUTION */ | |
537 | ||
3185942a JA |
538 | /* Reset execution context */ |
539 | loop_level = continuing = breaking = 0; | |
540 | executing_list = comsub_ignore_return = return_catch_flag = 0; | |
541 | ||
ccc6cda3 JA |
542 | run_exit_trap (); |
543 | set_signal_handler (sig, SIG_DFL); | |
544 | kill (getpid (), sig); | |
ccc6cda3 JA |
545 | } |
546 | ||
547 | /* What we really do when SIGINT occurs. */ | |
548 | sighandler | |
549 | sigint_sighandler (sig) | |
550 | int sig; | |
551 | { | |
552 | #if defined (MUST_REINSTALL_SIGHANDLERS) | |
553 | signal (sig, sigint_sighandler); | |
554 | #endif | |
555 | ||
556 | /* interrupt_state needs to be set for the stack of interrupts to work | |
557 | right. Should it be set unconditionally? */ | |
558 | if (interrupt_state == 0) | |
559 | ADDINTERRUPT; | |
560 | ||
561 | if (interrupt_immediately) | |
562 | { | |
563 | interrupt_immediately = 0; | |
0001803f | 564 | last_command_exit_value = 128 + sig; |
ccc6cda3 JA |
565 | throw_to_top_level (); |
566 | } | |
567 | ||
568 | SIGRETURN (0); | |
569 | } | |
570 | ||
95732b49 JA |
571 | #if defined (SIGWINCH) |
572 | sighandler | |
573 | sigwinch_sighandler (sig) | |
574 | int sig; | |
575 | { | |
576 | #if defined (MUST_REINSTALL_SIGHANDLERS) | |
577 | set_signal_handler (SIGWINCH, sigwinch_sighandler); | |
578 | #endif /* MUST_REINSTALL_SIGHANDLERS */ | |
579 | sigwinch_received = 1; | |
580 | SIGRETURN (0); | |
581 | } | |
582 | #endif /* SIGWINCH */ | |
583 | ||
584 | void | |
585 | set_sigwinch_handler () | |
586 | { | |
587 | #if defined (SIGWINCH) | |
588 | old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler); | |
589 | #endif | |
590 | } | |
591 | ||
592 | void | |
593 | unset_sigwinch_handler () | |
594 | { | |
595 | #if defined (SIGWINCH) | |
596 | set_signal_handler (SIGWINCH, old_winch); | |
597 | #endif | |
598 | } | |
599 | ||
ccc6cda3 JA |
600 | /* Signal functions used by the rest of the code. */ |
601 | #if !defined (HAVE_POSIX_SIGNALS) | |
602 | ||
603 | #if defined (JOB_CONTROL) | |
604 | /* Perform OPERATION on NEWSET, perhaps leaving information in OLDSET. */ | |
605 | sigprocmask (operation, newset, oldset) | |
606 | int operation, *newset, *oldset; | |
607 | { | |
608 | int old, new; | |
609 | ||
610 | if (newset) | |
611 | new = *newset; | |
612 | else | |
613 | new = 0; | |
614 | ||
615 | switch (operation) | |
616 | { | |
617 | case SIG_BLOCK: | |
618 | old = sigblock (new); | |
619 | break; | |
620 | ||
621 | case SIG_SETMASK: | |
622 | sigsetmask (new); | |
623 | break; | |
624 | ||
625 | default: | |
b80f6443 | 626 | internal_error (_("sigprocmask: %d: invalid operation"), operation); |
ccc6cda3 JA |
627 | } |
628 | ||
629 | if (oldset) | |
630 | *oldset = old; | |
631 | } | |
632 | #endif /* JOB_CONTROL */ | |
633 | ||
634 | #else | |
635 | ||
636 | #if !defined (SA_INTERRUPT) | |
637 | # define SA_INTERRUPT 0 | |
638 | #endif | |
639 | ||
640 | #if !defined (SA_RESTART) | |
641 | # define SA_RESTART 0 | |
642 | #endif | |
643 | ||
644 | SigHandler * | |
645 | set_signal_handler (sig, handler) | |
646 | int sig; | |
647 | SigHandler *handler; | |
648 | { | |
649 | struct sigaction act, oact; | |
650 | ||
651 | act.sa_handler = handler; | |
652 | act.sa_flags = 0; | |
653 | #if 0 | |
654 | if (sig == SIGALRM) | |
655 | act.sa_flags |= SA_INTERRUPT; /* XXX */ | |
656 | else | |
657 | act.sa_flags |= SA_RESTART; /* XXX */ | |
658 | #endif | |
659 | sigemptyset (&act.sa_mask); | |
660 | sigemptyset (&oact.sa_mask); | |
661 | sigaction (sig, &act, &oact); | |
662 | return (oact.sa_handler); | |
663 | } | |
664 | #endif /* HAVE_POSIX_SIGNALS */ |