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ccc6cda3 JA |
1 | /* sig.c - interface for shell signal handlers and signal initialization. */ |
2 | ||
d233b485 | 3 | /* Copyright (C) 1994-2018 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 | 37 | #include "shell.h" |
d233b485 | 38 | #include "execute_cmd.h" |
ccc6cda3 JA |
39 | #if defined (JOB_CONTROL) |
40 | #include "jobs.h" | |
41 | #endif /* JOB_CONTROL */ | |
42 | #include "siglist.h" | |
43 | #include "sig.h" | |
44 | #include "trap.h" | |
45 | ||
46 | #include "builtins/common.h" | |
ac50fbac | 47 | #include "builtins/builtext.h" |
ccc6cda3 JA |
48 | |
49 | #if defined (READLINE) | |
50 | # include "bashline.h" | |
d5d00961 | 51 | # include <readline/readline.h> |
ccc6cda3 JA |
52 | #endif |
53 | ||
54 | #if defined (HISTORY) | |
55 | # include "bashhist.h" | |
56 | #endif | |
57 | ||
495aee44 | 58 | extern void initialize_siglist (); |
ccc6cda3 | 59 | |
a0c0a00f CR |
60 | #if !defined (JOB_CONTROL) |
61 | extern void initialize_job_signals __P((void)); | |
62 | #endif | |
63 | ||
ccc6cda3 | 64 | /* Non-zero after SIGINT. */ |
ac50fbac | 65 | volatile sig_atomic_t interrupt_state = 0; |
ccc6cda3 | 66 | |
95732b49 | 67 | /* Non-zero after SIGWINCH */ |
ac50fbac CR |
68 | volatile sig_atomic_t sigwinch_received = 0; |
69 | ||
70 | /* Non-zero after SIGTERM */ | |
71 | volatile sig_atomic_t sigterm_received = 0; | |
95732b49 | 72 | |
0628567a | 73 | /* Set to the value of any terminating signal received. */ |
ac50fbac | 74 | volatile sig_atomic_t terminating_signal = 0; |
0628567a | 75 | |
ccc6cda3 JA |
76 | /* The environment at the top-level R-E loop. We use this in |
77 | the case of error return. */ | |
78 | procenv_t top_level; | |
79 | ||
80 | #if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS) | |
81 | /* The signal masks that this shell runs with. */ | |
82 | sigset_t top_level_mask; | |
83 | #endif /* JOB_CONTROL */ | |
84 | ||
85 | /* When non-zero, we throw_to_top_level (). */ | |
86 | int interrupt_immediately = 0; | |
87 | ||
0628567a JA |
88 | /* When non-zero, we call the terminating signal handler immediately. */ |
89 | int terminate_immediately = 0; | |
90 | ||
95732b49 JA |
91 | #if defined (SIGWINCH) |
92 | static SigHandler *old_winch = (SigHandler *)SIG_DFL; | |
93 | #endif | |
94 | ||
f73dda09 | 95 | static void initialize_shell_signals __P((void)); |
ccc6cda3 JA |
96 | |
97 | void | |
7117c2d2 JA |
98 | initialize_signals (reinit) |
99 | int reinit; | |
ccc6cda3 | 100 | { |
d166f048 | 101 | initialize_shell_signals (); |
ccc6cda3 | 102 | initialize_job_signals (); |
e8ce775d | 103 | #if !defined (HAVE_SYS_SIGLIST) && !defined (HAVE_UNDER_SYS_SIGLIST) && !defined (HAVE_STRSIGNAL) |
7117c2d2 JA |
104 | if (reinit == 0) |
105 | initialize_siglist (); | |
e8ce775d | 106 | #endif /* !HAVE_SYS_SIGLIST && !HAVE_UNDER_SYS_SIGLIST && !HAVE_STRSIGNAL */ |
ccc6cda3 JA |
107 | } |
108 | ||
ccc6cda3 JA |
109 | /* A structure describing a signal that terminates the shell if not |
110 | caught. The orig_handler member is present so children can reset | |
111 | these signals back to their original handlers. */ | |
112 | struct termsig { | |
113 | int signum; | |
114 | SigHandler *orig_handler; | |
95732b49 | 115 | int orig_flags; |
d233b485 | 116 | int core_dump; |
ccc6cda3 JA |
117 | }; |
118 | ||
119 | #define NULL_HANDLER (SigHandler *)SIG_DFL | |
120 | ||
121 | /* The list of signals that would terminate the shell if not caught. | |
122 | We catch them, but just so that we can write the history file, | |
123 | and so forth. */ | |
124 | static struct termsig terminating_signals[] = { | |
125 | #ifdef SIGHUP | |
95732b49 | 126 | { SIGHUP, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
127 | #endif |
128 | ||
129 | #ifdef SIGINT | |
95732b49 | 130 | { SIGINT, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
131 | #endif |
132 | ||
133 | #ifdef SIGILL | |
d233b485 | 134 | { SIGILL, NULL_HANDLER, 0, 1}, |
ccc6cda3 JA |
135 | #endif |
136 | ||
137 | #ifdef SIGTRAP | |
d233b485 | 138 | { SIGTRAP, NULL_HANDLER, 0, 1 }, |
ccc6cda3 JA |
139 | #endif |
140 | ||
141 | #ifdef SIGIOT | |
d233b485 | 142 | { SIGIOT, NULL_HANDLER, 0, 1 }, |
ccc6cda3 JA |
143 | #endif |
144 | ||
145 | #ifdef SIGDANGER | |
95732b49 | 146 | { SIGDANGER, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
147 | #endif |
148 | ||
149 | #ifdef SIGEMT | |
95732b49 | 150 | { SIGEMT, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
151 | #endif |
152 | ||
153 | #ifdef SIGFPE | |
d233b485 | 154 | { SIGFPE, NULL_HANDLER, 0, 1 }, |
ccc6cda3 JA |
155 | #endif |
156 | ||
157 | #ifdef SIGBUS | |
d233b485 | 158 | { SIGBUS, NULL_HANDLER, 0, 1 }, |
ccc6cda3 JA |
159 | #endif |
160 | ||
161 | #ifdef SIGSEGV | |
d233b485 | 162 | { SIGSEGV, NULL_HANDLER, 0, 1 }, |
ccc6cda3 JA |
163 | #endif |
164 | ||
165 | #ifdef SIGSYS | |
d233b485 | 166 | { SIGSYS, NULL_HANDLER, 0, 1 }, |
ccc6cda3 JA |
167 | #endif |
168 | ||
169 | #ifdef SIGPIPE | |
95732b49 | 170 | { SIGPIPE, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
171 | #endif |
172 | ||
173 | #ifdef SIGALRM | |
95732b49 | 174 | { SIGALRM, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
175 | #endif |
176 | ||
177 | #ifdef SIGTERM | |
95732b49 | 178 | { SIGTERM, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
179 | #endif |
180 | ||
d233b485 CR |
181 | /* These don't generate core dumps on anything but Linux, but we're doing |
182 | this just for Linux anyway. */ | |
ccc6cda3 | 183 | #ifdef SIGXCPU |
d233b485 | 184 | { SIGXCPU, NULL_HANDLER, 0, 1 }, |
ccc6cda3 JA |
185 | #endif |
186 | ||
187 | #ifdef SIGXFSZ | |
d233b485 | 188 | { SIGXFSZ, NULL_HANDLER, 0, 1 }, |
ccc6cda3 JA |
189 | #endif |
190 | ||
191 | #ifdef SIGVTALRM | |
95732b49 | 192 | { SIGVTALRM, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
193 | #endif |
194 | ||
bb70624e | 195 | #if 0 |
ccc6cda3 | 196 | #ifdef SIGPROF |
95732b49 | 197 | { SIGPROF, NULL_HANDLER, 0 }, |
ccc6cda3 | 198 | #endif |
bb70624e | 199 | #endif |
ccc6cda3 JA |
200 | |
201 | #ifdef SIGLOST | |
95732b49 | 202 | { SIGLOST, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
203 | #endif |
204 | ||
205 | #ifdef SIGUSR1 | |
95732b49 | 206 | { SIGUSR1, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
207 | #endif |
208 | ||
209 | #ifdef SIGUSR2 | |
95732b49 | 210 | { SIGUSR2, NULL_HANDLER, 0 }, |
ccc6cda3 JA |
211 | #endif |
212 | }; | |
213 | ||
214 | #define TERMSIGS_LENGTH (sizeof (terminating_signals) / sizeof (struct termsig)) | |
215 | ||
216 | #define XSIG(x) (terminating_signals[x].signum) | |
217 | #define XHANDLER(x) (terminating_signals[x].orig_handler) | |
95732b49 | 218 | #define XSAFLAGS(x) (terminating_signals[x].orig_flags) |
d233b485 | 219 | #define XCOREDUMP(x) (terminating_signals[x].core_dump) |
ccc6cda3 | 220 | |
d166f048 JA |
221 | static int termsigs_initialized = 0; |
222 | ||
ccc6cda3 | 223 | /* Initialize signals that will terminate the shell to do some |
d166f048 | 224 | unwind protection. For non-interactive shells, we only call |
495aee44 CR |
225 | this when a trap is defined for EXIT (0) or when trap is run |
226 | to display signal dispositions. */ | |
d166f048 | 227 | void |
ccc6cda3 JA |
228 | initialize_terminating_signals () |
229 | { | |
230 | register int i; | |
d166f048 JA |
231 | #if defined (HAVE_POSIX_SIGNALS) |
232 | struct sigaction act, oact; | |
233 | #endif | |
234 | ||
235 | if (termsigs_initialized) | |
236 | return; | |
ccc6cda3 JA |
237 | |
238 | /* The following code is to avoid an expensive call to | |
239 | set_signal_handler () for each terminating_signals. Fortunately, | |
240 | this is possible in Posix. Unfortunately, we have to call signal () | |
241 | on non-Posix systems for each signal in terminating_signals. */ | |
242 | #if defined (HAVE_POSIX_SIGNALS) | |
0628567a | 243 | act.sa_handler = termsig_sighandler; |
ccc6cda3 JA |
244 | act.sa_flags = 0; |
245 | sigemptyset (&act.sa_mask); | |
246 | sigemptyset (&oact.sa_mask); | |
247 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
248 | sigaddset (&act.sa_mask, XSIG (i)); | |
249 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
250 | { | |
7117c2d2 JA |
251 | /* If we've already trapped it, don't do anything. */ |
252 | if (signal_is_trapped (XSIG (i))) | |
253 | continue; | |
254 | ||
ccc6cda3 | 255 | sigaction (XSIG (i), &act, &oact); |
d166f048 | 256 | XHANDLER(i) = oact.sa_handler; |
95732b49 | 257 | XSAFLAGS(i) = oact.sa_flags; |
ccc6cda3 JA |
258 | /* Don't do anything with signals that are ignored at shell entry |
259 | if the shell is not interactive. */ | |
495aee44 CR |
260 | /* XXX - should we do this for interactive shells, too? */ |
261 | if (interactive_shell == 0 && XHANDLER (i) == SIG_IGN) | |
28ef6c31 | 262 | { |
ccc6cda3 | 263 | sigaction (XSIG (i), &oact, &act); |
ac50fbac | 264 | set_signal_hard_ignored (XSIG (i)); |
28ef6c31 | 265 | } |
cce855bc | 266 | #if defined (SIGPROF) && !defined (_MINIX) |
d166f048 | 267 | if (XSIG (i) == SIGPROF && XHANDLER (i) != SIG_DFL && XHANDLER (i) != SIG_IGN) |
28ef6c31 | 268 | sigaction (XSIG (i), &oact, (struct sigaction *)NULL); |
cce855bc | 269 | #endif /* SIGPROF && !_MINIX */ |
ccc6cda3 | 270 | } |
ccc6cda3 JA |
271 | #else /* !HAVE_POSIX_SIGNALS */ |
272 | ||
273 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
274 | { | |
7117c2d2 JA |
275 | /* If we've already trapped it, don't do anything. */ |
276 | if (signal_is_trapped (XSIG (i))) | |
277 | continue; | |
278 | ||
0628567a | 279 | XHANDLER(i) = signal (XSIG (i), termsig_sighandler); |
95732b49 | 280 | XSAFLAGS(i) = 0; |
ccc6cda3 JA |
281 | /* Don't do anything with signals that are ignored at shell entry |
282 | if the shell is not interactive. */ | |
495aee44 CR |
283 | /* XXX - should we do this for interactive shells, too? */ |
284 | if (interactive_shell == 0 && XHANDLER (i) == SIG_IGN) | |
ccc6cda3 | 285 | { |
28ef6c31 | 286 | signal (XSIG (i), SIG_IGN); |
ac50fbac | 287 | set_signal_hard_ignored (XSIG (i)); |
ccc6cda3 | 288 | } |
cce855bc | 289 | #ifdef SIGPROF |
d166f048 | 290 | if (XSIG (i) == SIGPROF && XHANDLER (i) != SIG_DFL && XHANDLER (i) != SIG_IGN) |
28ef6c31 | 291 | signal (XSIG (i), XHANDLER (i)); |
cce855bc | 292 | #endif |
ccc6cda3 JA |
293 | } |
294 | ||
295 | #endif /* !HAVE_POSIX_SIGNALS */ | |
296 | ||
d166f048 JA |
297 | termsigs_initialized = 1; |
298 | } | |
299 | ||
300 | static void | |
301 | initialize_shell_signals () | |
302 | { | |
303 | if (interactive) | |
304 | initialize_terminating_signals (); | |
305 | ||
ccc6cda3 JA |
306 | #if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS) |
307 | /* All shells use the signal mask they inherit, and pass it along | |
308 | to child processes. Children will never block SIGCHLD, though. */ | |
309 | sigemptyset (&top_level_mask); | |
310 | sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &top_level_mask); | |
bb70624e | 311 | # if defined (SIGCHLD) |
ccc6cda3 | 312 | sigdelset (&top_level_mask, SIGCHLD); |
bb70624e | 313 | # endif |
ccc6cda3 JA |
314 | #endif /* JOB_CONTROL || HAVE_POSIX_SIGNALS */ |
315 | ||
316 | /* And, some signals that are specifically ignored by the shell. */ | |
317 | set_signal_handler (SIGQUIT, SIG_IGN); | |
318 | ||
319 | if (interactive) | |
320 | { | |
321 | set_signal_handler (SIGINT, sigint_sighandler); | |
ac50fbac CR |
322 | get_original_signal (SIGTERM); |
323 | if (signal_is_hard_ignored (SIGTERM) == 0) | |
324 | set_signal_handler (SIGTERM, sigterm_sighandler); | |
95732b49 | 325 | set_sigwinch_handler (); |
ccc6cda3 JA |
326 | } |
327 | } | |
328 | ||
329 | void | |
330 | reset_terminating_signals () | |
331 | { | |
332 | register int i; | |
ccc6cda3 JA |
333 | #if defined (HAVE_POSIX_SIGNALS) |
334 | struct sigaction act; | |
d166f048 | 335 | #endif |
ccc6cda3 | 336 | |
d166f048 JA |
337 | if (termsigs_initialized == 0) |
338 | return; | |
339 | ||
340 | #if defined (HAVE_POSIX_SIGNALS) | |
ccc6cda3 JA |
341 | act.sa_flags = 0; |
342 | sigemptyset (&act.sa_mask); | |
343 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
344 | { | |
345 | /* Skip a signal if it's trapped or handled specially, because the | |
346 | trap code will restore the correct value. */ | |
347 | if (signal_is_trapped (XSIG (i)) || signal_is_special (XSIG (i))) | |
348 | continue; | |
349 | ||
350 | act.sa_handler = XHANDLER (i); | |
95732b49 | 351 | act.sa_flags = XSAFLAGS (i); |
ccc6cda3 JA |
352 | sigaction (XSIG (i), &act, (struct sigaction *) NULL); |
353 | } | |
354 | #else /* !HAVE_POSIX_SIGNALS */ | |
355 | for (i = 0; i < TERMSIGS_LENGTH; i++) | |
356 | { | |
357 | if (signal_is_trapped (XSIG (i)) || signal_is_special (XSIG (i))) | |
358 | continue; | |
359 | ||
360 | signal (XSIG (i), XHANDLER (i)); | |
361 | } | |
362 | #endif /* !HAVE_POSIX_SIGNALS */ | |
ac50fbac CR |
363 | |
364 | termsigs_initialized = 0; | |
ccc6cda3 | 365 | } |
ccc6cda3 JA |
366 | #undef XHANDLER |
367 | ||
f1be666c JA |
368 | /* Run some of the cleanups that should be performed when we run |
369 | jump_to_top_level from a builtin command context. XXX - might want to | |
370 | also call reset_parser here. */ | |
371 | void | |
372 | top_level_cleanup () | |
373 | { | |
374 | /* Clean up string parser environment. */ | |
375 | while (parse_and_execute_level) | |
d233b485 | 376 | parse_and_execute_cleanup (-1); |
f1be666c JA |
377 | |
378 | #if defined (PROCESS_SUBSTITUTION) | |
379 | unlink_fifo_list (); | |
380 | #endif /* PROCESS_SUBSTITUTION */ | |
381 | ||
382 | run_unwind_protects (); | |
495aee44 | 383 | loop_level = continuing = breaking = funcnest = 0; |
a0c0a00f | 384 | executing_list = comsub_ignore_return = return_catch_flag = wait_intr_flag = 0; |
f1be666c JA |
385 | } |
386 | ||
ccc6cda3 JA |
387 | /* What to do when we've been interrupted, and it is safe to handle it. */ |
388 | void | |
389 | throw_to_top_level () | |
390 | { | |
391 | int print_newline = 0; | |
392 | ||
393 | if (interrupt_state) | |
394 | { | |
ac50fbac CR |
395 | if (last_command_exit_value < 128) |
396 | last_command_exit_value = 128 + SIGINT; | |
ccc6cda3 JA |
397 | print_newline = 1; |
398 | DELINTERRUPT; | |
399 | } | |
400 | ||
401 | if (interrupt_state) | |
402 | return; | |
403 | ||
b80f6443 JA |
404 | last_command_exit_signal = (last_command_exit_value > 128) ? |
405 | (last_command_exit_value - 128) : 0; | |
ccc6cda3 JA |
406 | last_command_exit_value |= 128; |
407 | ||
a0c0a00f CR |
408 | /* Run any traps set on SIGINT, mostly for interactive shells */ |
409 | if (signal_is_trapped (SIGINT)) | |
410 | run_interrupt_trap (1); | |
ccc6cda3 | 411 | |
3185942a | 412 | /* Clean up string parser environment. */ |
ccc6cda3 | 413 | while (parse_and_execute_level) |
d233b485 | 414 | parse_and_execute_cleanup (-1); |
ccc6cda3 | 415 | |
a0c0a00f CR |
416 | if (running_trap > 0) |
417 | run_trap_cleanup (running_trap - 1); | |
418 | ||
ccc6cda3 | 419 | #if defined (JOB_CONTROL) |
28ef6c31 | 420 | give_terminal_to (shell_pgrp, 0); |
ccc6cda3 JA |
421 | #endif /* JOB_CONTROL */ |
422 | ||
423 | #if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS) | |
ac50fbac CR |
424 | /* This needs to stay because jobs.c:make_child() uses it without resetting |
425 | the signal mask. */ | |
ccc6cda3 JA |
426 | sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL); |
427 | #endif | |
428 | ||
429 | reset_parser (); | |
430 | ||
431 | #if defined (READLINE) | |
432 | if (interactive) | |
3185942a | 433 | bashline_reset (); |
ccc6cda3 JA |
434 | #endif /* READLINE */ |
435 | ||
436 | #if defined (PROCESS_SUBSTITUTION) | |
437 | unlink_fifo_list (); | |
438 | #endif /* PROCESS_SUBSTITUTION */ | |
439 | ||
440 | run_unwind_protects (); | |
495aee44 | 441 | loop_level = continuing = breaking = funcnest = 0; |
a0c0a00f | 442 | executing_list = comsub_ignore_return = return_catch_flag = wait_intr_flag = 0; |
ccc6cda3 JA |
443 | |
444 | if (interactive && print_newline) | |
445 | { | |
446 | fflush (stdout); | |
447 | fprintf (stderr, "\n"); | |
448 | fflush (stderr); | |
449 | } | |
450 | ||
451 | /* An interrupted `wait' command in a script does not exit the script. */ | |
452 | if (interactive || (interactive_shell && !shell_initialized) || | |
453 | (print_newline && signal_is_trapped (SIGINT))) | |
454 | jump_to_top_level (DISCARD); | |
455 | else | |
456 | jump_to_top_level (EXITPROG); | |
457 | } | |
458 | ||
459 | /* This is just here to isolate the longjmp calls. */ | |
460 | void | |
461 | jump_to_top_level (value) | |
462 | int value; | |
463 | { | |
a0c0a00f | 464 | sh_longjmp (top_level, value); |
ccc6cda3 JA |
465 | } |
466 | ||
467 | sighandler | |
0628567a | 468 | termsig_sighandler (sig) |
ccc6cda3 JA |
469 | int sig; |
470 | { | |
89a92869 CR |
471 | /* If we get called twice with the same signal before handling it, |
472 | terminate right away. */ | |
473 | if ( | |
474 | #ifdef SIGHUP | |
475 | sig != SIGHUP && | |
476 | #endif | |
477 | #ifdef SIGINT | |
478 | sig != SIGINT && | |
479 | #endif | |
480 | #ifdef SIGDANGER | |
481 | sig != SIGDANGER && | |
482 | #endif | |
483 | #ifdef SIGPIPE | |
484 | sig != SIGPIPE && | |
485 | #endif | |
486 | #ifdef SIGALRM | |
487 | sig != SIGALRM && | |
488 | #endif | |
489 | #ifdef SIGTERM | |
490 | sig != SIGTERM && | |
491 | #endif | |
492 | #ifdef SIGXCPU | |
493 | sig != SIGXCPU && | |
494 | #endif | |
495 | #ifdef SIGXFSZ | |
496 | sig != SIGXFSZ && | |
497 | #endif | |
498 | #ifdef SIGVTALRM | |
499 | sig != SIGVTALRM && | |
500 | #endif | |
501 | #ifdef SIGLOST | |
502 | sig != SIGLOST && | |
503 | #endif | |
504 | #ifdef SIGUSR1 | |
505 | sig != SIGUSR1 && | |
506 | #endif | |
507 | #ifdef SIGUSR2 | |
508 | sig != SIGUSR2 && | |
509 | #endif | |
510 | sig == terminating_signal) | |
511 | terminate_immediately = 1; | |
512 | ||
0628567a JA |
513 | terminating_signal = sig; |
514 | ||
3185942a | 515 | /* XXX - should this also trigger when interrupt_immediately is set? */ |
0628567a JA |
516 | if (terminate_immediately) |
517 | { | |
495aee44 CR |
518 | #if defined (HISTORY) |
519 | /* XXX - will inhibit history file being written */ | |
d5d00961 CR |
520 | # if defined (READLINE) |
521 | if (interactive_shell == 0 || interactive == 0 || (sig != SIGHUP && sig != SIGTERM) || no_line_editing || (RL_ISSTATE (RL_STATE_READCMD) == 0)) | |
522 | # endif | |
523 | history_lines_this_session = 0; | |
495aee44 | 524 | #endif |
0628567a JA |
525 | terminate_immediately = 0; |
526 | termsig_handler (sig); | |
527 | } | |
528 | ||
ac50fbac CR |
529 | #if defined (READLINE) |
530 | /* Set the event hook so readline will call it after the signal handlers | |
531 | finish executing, so if this interrupted character input we can get | |
84c617ec CR |
532 | quick response. If readline is active or has modified the terminal we |
533 | need to set this no matter what the signal is, though the check for | |
534 | RL_STATE_TERMPREPPED is possibly redundant. */ | |
535 | if (RL_ISSTATE (RL_STATE_SIGHANDLER) || RL_ISSTATE (RL_STATE_TERMPREPPED)) | |
ac50fbac CR |
536 | bashline_set_event_hook (); |
537 | #endif | |
538 | ||
0628567a JA |
539 | SIGRETURN (0); |
540 | } | |
541 | ||
542 | void | |
543 | termsig_handler (sig) | |
544 | int sig; | |
545 | { | |
546 | static int handling_termsig = 0; | |
d233b485 CR |
547 | int i, core; |
548 | sigset_t mask; | |
0628567a JA |
549 | |
550 | /* Simple semaphore to keep this function from being executed multiple | |
551 | times. Since we no longer are running as a signal handler, we don't | |
552 | block multiple occurrences of the terminating signals while running. */ | |
553 | if (handling_termsig) | |
554 | return; | |
555 | handling_termsig = 1; | |
556 | terminating_signal = 0; /* keep macro from re-testing true. */ | |
557 | ||
95732b49 | 558 | /* I don't believe this condition ever tests true. */ |
ccc6cda3 | 559 | if (sig == SIGINT && signal_is_trapped (SIGINT)) |
a0c0a00f | 560 | run_interrupt_trap (0); |
ccc6cda3 JA |
561 | |
562 | #if defined (HISTORY) | |
ac50fbac CR |
563 | /* If we don't do something like this, the history will not be saved when |
564 | an interactive shell is running in a terminal window that gets closed | |
565 | with the `close' button. We can't test for RL_STATE_READCMD because | |
566 | readline no longer handles SIGTERM synchronously. */ | |
567 | if (interactive_shell && interactive && (sig == SIGHUP || sig == SIGTERM) && remember_on_history) | |
ccc6cda3 JA |
568 | maybe_save_shell_history (); |
569 | #endif /* HISTORY */ | |
570 | ||
a0c0a00f CR |
571 | if (this_shell_builtin == read_builtin) |
572 | read_tty_cleanup (); | |
573 | ||
ccc6cda3 | 574 | #if defined (JOB_CONTROL) |
0001803f | 575 | if (sig == SIGHUP && (interactive || (subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PROCSUB)))) |
ccc6cda3 | 576 | hangup_all_jobs (); |
d233b485 | 577 | |
76bb456d CR |
578 | if ((subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PROCSUB)) == 0) |
579 | end_job_control (); | |
ccc6cda3 JA |
580 | #endif /* JOB_CONTROL */ |
581 | ||
582 | #if defined (PROCESS_SUBSTITUTION) | |
583 | unlink_fifo_list (); | |
584 | #endif /* PROCESS_SUBSTITUTION */ | |
585 | ||
3185942a | 586 | /* Reset execution context */ |
495aee44 | 587 | loop_level = continuing = breaking = funcnest = 0; |
a0c0a00f | 588 | executing_list = comsub_ignore_return = return_catch_flag = wait_intr_flag = 0; |
3185942a | 589 | |
ac50fbac | 590 | run_exit_trap (); /* XXX - run exit trap possibly in signal context? */ |
d233b485 CR |
591 | |
592 | /* We don't change the set of blocked signals. If a user starts the shell | |
593 | with a terminating signal blocked, we won't get here (and if by some | |
594 | magic chance we do, we'll exit below). */ | |
ccc6cda3 | 595 | set_signal_handler (sig, SIG_DFL); |
d233b485 | 596 | |
ccc6cda3 | 597 | kill (getpid (), sig); |
d233b485 CR |
598 | |
599 | if (dollar_dollar_pid != 1) | |
600 | exit (128+sig); /* just in case the kill fails? */ | |
601 | ||
602 | /* We get here only under extraordinary circumstances. */ | |
603 | ||
604 | /* We are PID 1, and the kill above failed to kill the process. We assume | |
605 | this means that we are running as an init process in a pid namespace | |
606 | on Linux. In this case, we can't send ourselves a fatal signal, so we | |
607 | determine whether or not we should have generated a core dump with the | |
608 | kill call and attempt to trick the kernel into generating one if | |
609 | necessary. */ | |
610 | sigprocmask (SIG_SETMASK, (sigset_t *)NULL, &mask); | |
611 | for (i = core = 0; i < TERMSIGS_LENGTH; i++) | |
612 | { | |
613 | set_signal_handler (XSIG (i), SIG_DFL); | |
614 | sigdelset (&mask, XSIG (i)); | |
615 | if (sig == XSIG (i)) | |
616 | core = XCOREDUMP (i); | |
617 | } | |
618 | sigprocmask (SIG_SETMASK, &mask, (sigset_t *)NULL); | |
619 | ||
620 | if (core) | |
621 | *((volatile unsigned long *) NULL) = 0xdead0000 + sig; /* SIGSEGV */ | |
622 | ||
623 | exit (128+sig); | |
ccc6cda3 | 624 | } |
d233b485 | 625 | #undef XSIG |
ccc6cda3 JA |
626 | |
627 | /* What we really do when SIGINT occurs. */ | |
628 | sighandler | |
629 | sigint_sighandler (sig) | |
630 | int sig; | |
631 | { | |
632 | #if defined (MUST_REINSTALL_SIGHANDLERS) | |
633 | signal (sig, sigint_sighandler); | |
634 | #endif | |
635 | ||
636 | /* interrupt_state needs to be set for the stack of interrupts to work | |
637 | right. Should it be set unconditionally? */ | |
638 | if (interrupt_state == 0) | |
639 | ADDINTERRUPT; | |
640 | ||
ac50fbac | 641 | /* We will get here in interactive shells with job control active; allow |
a0c0a00f CR |
642 | an interactive wait to be interrupted. wait_intr_flag is only set during |
643 | the execution of the wait builtin and when wait_intr_buf is valid. */ | |
644 | if (wait_intr_flag) | |
ac50fbac CR |
645 | { |
646 | last_command_exit_value = 128 + sig; | |
647 | wait_signal_received = sig; | |
648 | SIGRETURN (0); | |
649 | } | |
650 | ||
ccc6cda3 JA |
651 | if (interrupt_immediately) |
652 | { | |
653 | interrupt_immediately = 0; | |
0001803f | 654 | last_command_exit_value = 128 + sig; |
ccc6cda3 JA |
655 | throw_to_top_level (); |
656 | } | |
ac50fbac CR |
657 | #if defined (READLINE) |
658 | /* Set the event hook so readline will call it after the signal handlers | |
659 | finish executing, so if this interrupted character input we can get | |
660 | quick response. */ | |
661 | else if (RL_ISSTATE (RL_STATE_SIGHANDLER)) | |
662 | bashline_set_event_hook (); | |
663 | #endif | |
ccc6cda3 JA |
664 | |
665 | SIGRETURN (0); | |
666 | } | |
667 | ||
95732b49 JA |
668 | #if defined (SIGWINCH) |
669 | sighandler | |
670 | sigwinch_sighandler (sig) | |
671 | int sig; | |
672 | { | |
673 | #if defined (MUST_REINSTALL_SIGHANDLERS) | |
674 | set_signal_handler (SIGWINCH, sigwinch_sighandler); | |
675 | #endif /* MUST_REINSTALL_SIGHANDLERS */ | |
676 | sigwinch_received = 1; | |
677 | SIGRETURN (0); | |
678 | } | |
679 | #endif /* SIGWINCH */ | |
680 | ||
681 | void | |
682 | set_sigwinch_handler () | |
683 | { | |
684 | #if defined (SIGWINCH) | |
685 | old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler); | |
686 | #endif | |
687 | } | |
688 | ||
689 | void | |
690 | unset_sigwinch_handler () | |
691 | { | |
692 | #if defined (SIGWINCH) | |
693 | set_signal_handler (SIGWINCH, old_winch); | |
694 | #endif | |
695 | } | |
696 | ||
ac50fbac CR |
697 | sighandler |
698 | sigterm_sighandler (sig) | |
699 | int sig; | |
700 | { | |
701 | sigterm_received = 1; /* XXX - counter? */ | |
702 | SIGRETURN (0); | |
703 | } | |
704 | ||
ccc6cda3 JA |
705 | /* Signal functions used by the rest of the code. */ |
706 | #if !defined (HAVE_POSIX_SIGNALS) | |
707 | ||
ccc6cda3 JA |
708 | /* Perform OPERATION on NEWSET, perhaps leaving information in OLDSET. */ |
709 | sigprocmask (operation, newset, oldset) | |
710 | int operation, *newset, *oldset; | |
711 | { | |
712 | int old, new; | |
713 | ||
714 | if (newset) | |
715 | new = *newset; | |
716 | else | |
717 | new = 0; | |
718 | ||
719 | switch (operation) | |
720 | { | |
721 | case SIG_BLOCK: | |
722 | old = sigblock (new); | |
723 | break; | |
724 | ||
725 | case SIG_SETMASK: | |
ac50fbac | 726 | old = sigsetmask (new); |
ccc6cda3 JA |
727 | break; |
728 | ||
729 | default: | |
b80f6443 | 730 | internal_error (_("sigprocmask: %d: invalid operation"), operation); |
ccc6cda3 JA |
731 | } |
732 | ||
733 | if (oldset) | |
734 | *oldset = old; | |
735 | } | |
ccc6cda3 JA |
736 | |
737 | #else | |
738 | ||
739 | #if !defined (SA_INTERRUPT) | |
740 | # define SA_INTERRUPT 0 | |
741 | #endif | |
742 | ||
743 | #if !defined (SA_RESTART) | |
744 | # define SA_RESTART 0 | |
745 | #endif | |
746 | ||
747 | SigHandler * | |
748 | set_signal_handler (sig, handler) | |
749 | int sig; | |
750 | SigHandler *handler; | |
751 | { | |
752 | struct sigaction act, oact; | |
753 | ||
754 | act.sa_handler = handler; | |
755 | act.sa_flags = 0; | |
495aee44 CR |
756 | |
757 | /* XXX - bash-4.2 */ | |
758 | /* We don't want a child death to interrupt interruptible system calls, even | |
759 | if we take the time to reap children */ | |
ac50fbac | 760 | #if defined (SIGCHLD) |
30d188c2 | 761 | if (sig == SIGCHLD) |
495aee44 | 762 | act.sa_flags |= SA_RESTART; /* XXX */ |
d233b485 CR |
763 | #endif |
764 | /* Let's see if we can keep SIGWINCH from interrupting interruptible system | |
765 | calls, like open(2)/read(2)/write(2) */ | |
766 | #if defined (SIGWINCH) | |
767 | if (sig == SIGWINCH) | |
768 | act.sa_flags |= SA_RESTART; /* XXX */ | |
ac50fbac CR |
769 | #endif |
770 | /* If we're installing a SIGTERM handler for interactive shells, we want | |
771 | it to be as close to SIG_IGN as possible. */ | |
772 | if (sig == SIGTERM && handler == sigterm_sighandler) | |
773 | act.sa_flags |= SA_RESTART; /* XXX */ | |
495aee44 | 774 | |
ccc6cda3 JA |
775 | sigemptyset (&act.sa_mask); |
776 | sigemptyset (&oact.sa_mask); | |
ac50fbac CR |
777 | if (sigaction (sig, &act, &oact) == 0) |
778 | return (oact.sa_handler); | |
779 | else | |
780 | return (SIG_DFL); | |
ccc6cda3 JA |
781 | } |
782 | #endif /* HAVE_POSIX_SIGNALS */ |