]>
Commit | Line | Data |
---|---|---|
726f6388 JA |
1 | /* trap.c -- Not the trap command, but useful functions for manipulating |
2 | those objects. The trap command is in builtins/trap.def. */ | |
3 | ||
8868edaf | 4 | /* Copyright (C) 1987-2020 Free Software Foundation, Inc. |
726f6388 JA |
5 | |
6 | This file is part of GNU Bash, the Bourne Again SHell. | |
7 | ||
3185942a JA |
8 | Bash is free software: you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation, either version 3 of the License, or | |
11 | (at your option) any later version. | |
726f6388 | 12 | |
3185942a JA |
13 | Bash is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
726f6388 | 17 | |
3185942a JA |
18 | You should have received a copy of the GNU General Public License |
19 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
726f6388 | 21 | |
ccc6cda3 JA |
22 | #include "config.h" |
23 | ||
e8ce775d JA |
24 | #if defined (HAVE_UNISTD_H) |
25 | # include <unistd.h> | |
26 | #endif | |
27 | ||
726f6388 | 28 | #include "bashtypes.h" |
d166f048 | 29 | #include "bashansi.h" |
726f6388 | 30 | |
cce855bc | 31 | #include <stdio.h> |
bb70624e | 32 | #include <errno.h> |
cce855bc | 33 | |
b80f6443 JA |
34 | #include "bashintl.h" |
35 | ||
ac50fbac CR |
36 | #include <signal.h> |
37 | ||
cce855bc JA |
38 | #include "trap.h" |
39 | ||
726f6388 | 40 | #include "shell.h" |
d233b485 | 41 | #include "execute_cmd.h" |
b80f6443 | 42 | #include "flags.h" |
d233b485 | 43 | #include "parser.h" |
bb70624e | 44 | #include "input.h" /* for save_token_state, restore_token_state */ |
3185942a | 45 | #include "jobs.h" |
726f6388 | 46 | #include "signames.h" |
7117c2d2 | 47 | #include "builtins.h" |
ccc6cda3 | 48 | #include "builtins/common.h" |
7117c2d2 | 49 | #include "builtins/builtext.h" |
726f6388 | 50 | |
ac50fbac CR |
51 | #if defined (READLINE) |
52 | # include <readline/readline.h> | |
53 | # include "bashline.h" | |
54 | #endif | |
55 | ||
bb70624e JA |
56 | #ifndef errno |
57 | extern int errno; | |
58 | #endif | |
59 | ||
726f6388 JA |
60 | /* Flags which describe the current handling state of a signal. */ |
61 | #define SIG_INHERITED 0x0 /* Value inherited from parent. */ | |
62 | #define SIG_TRAPPED 0x1 /* Currently trapped. */ | |
63 | #define SIG_HARD_IGNORE 0x2 /* Signal was ignored on shell entry. */ | |
64 | #define SIG_SPECIAL 0x4 /* Treat this signal specially. */ | |
65 | #define SIG_NO_TRAP 0x8 /* Signal cannot be trapped. */ | |
ccc6cda3 JA |
66 | #define SIG_INPROGRESS 0x10 /* Signal handler currently executing. */ |
67 | #define SIG_CHANGED 0x20 /* Trap value changed in trap handler. */ | |
68 | #define SIG_IGNORED 0x40 /* The signal is currently being ignored. */ | |
726f6388 | 69 | |
b80f6443 | 70 | #define SPECIAL_TRAP(s) ((s) == EXIT_TRAP || (s) == DEBUG_TRAP || (s) == ERROR_TRAP || (s) == RETURN_TRAP) |
f73dda09 | 71 | |
726f6388 | 72 | /* An array of such flags, one for each signal, describing what the |
ccc6cda3 JA |
73 | shell will do with a signal. DEBUG_TRAP == NSIG; some code below |
74 | assumes this. */ | |
f73dda09 JA |
75 | static int sigmodes[BASH_NSIG]; |
76 | ||
a0c0a00f CR |
77 | static void free_trap_command (int); |
78 | static void change_signal (int, char *); | |
f73dda09 | 79 | |
a0c0a00f | 80 | static int _run_trap_internal (int, char *); |
726f6388 | 81 | |
a0c0a00f CR |
82 | static void free_trap_string (int); |
83 | static void reset_signal (int); | |
84 | static void restore_signal (int); | |
85 | static void reset_or_restore_signal_handlers (sh_resetsig_func_t *); | |
86 | ||
87 | static void trap_if_untrapped (int, char *); | |
726f6388 JA |
88 | |
89 | /* Variables used here but defined in other files. */ | |
ac50fbac CR |
90 | extern procenv_t alrmbuf; |
91 | ||
a0c0a00f | 92 | extern volatile int from_return_trap; |
8868edaf | 93 | extern int waiting_for_child; |
a0c0a00f | 94 | |
0001803f | 95 | extern WORD_LIST *subst_assign_varlist; |
7117c2d2 | 96 | |
726f6388 JA |
97 | /* The list of things to do originally, before we started trapping. */ |
98 | SigHandler *original_signals[NSIG]; | |
99 | ||
100 | /* For each signal, a slot for a string, which is a command to be | |
ac50fbac | 101 | executed when that signal is received. The slot can also contain |
726f6388 JA |
102 | DEFAULT_SIG, which means do whatever you were going to do before |
103 | you were so rudely interrupted, or IGNORE_SIG, which says ignore | |
104 | this signal. */ | |
f73dda09 | 105 | char *trap_list[BASH_NSIG]; |
726f6388 JA |
106 | |
107 | /* A bitmap of signals received for which we have trap handlers. */ | |
108 | int pending_traps[NSIG]; | |
109 | ||
ccc6cda3 JA |
110 | /* Set to the number of the signal we're running the trap for + 1. |
111 | Used in execute_cmd.c and builtins/common.c to clean up when | |
112 | parse_and_execute does not return normally after executing the | |
113 | trap command (e.g., when `return' is executed in the trap command). */ | |
114 | int running_trap; | |
115 | ||
b80f6443 JA |
116 | /* Set to last_command_exit_value before running a trap. */ |
117 | int trap_saved_exit_value; | |
d166f048 | 118 | |
7117c2d2 JA |
119 | /* The (trapped) signal received while executing in the `wait' builtin */ |
120 | int wait_signal_received; | |
121 | ||
ac50fbac CR |
122 | int trapped_signal_received; |
123 | ||
8868edaf CR |
124 | /* Set to 1 to suppress the effect of `set v' in the DEBUG trap. */ |
125 | int suppress_debug_trap_verbose = 0; | |
126 | ||
0628567a JA |
127 | #define GETORIGSIG(sig) \ |
128 | do { \ | |
129 | original_signals[sig] = (SigHandler *)set_signal_handler (sig, SIG_DFL); \ | |
130 | set_signal_handler (sig, original_signals[sig]); \ | |
131 | if (original_signals[sig] == SIG_IGN) \ | |
132 | sigmodes[sig] |= SIG_HARD_IGNORE; \ | |
133 | } while (0) | |
134 | ||
495aee44 CR |
135 | #define SETORIGSIG(sig,handler) \ |
136 | do { \ | |
137 | original_signals[sig] = handler; \ | |
138 | if (original_signals[sig] == SIG_IGN) \ | |
139 | sigmodes[sig] |= SIG_HARD_IGNORE; \ | |
140 | } while (0) | |
141 | ||
0628567a JA |
142 | #define GET_ORIGINAL_SIGNAL(sig) \ |
143 | if (sig && sig < NSIG && original_signals[sig] == IMPOSSIBLE_TRAP_HANDLER) \ | |
144 | GETORIGSIG(sig) | |
145 | ||
726f6388 JA |
146 | void |
147 | initialize_traps () | |
148 | { | |
149 | register int i; | |
150 | ||
0628567a JA |
151 | initialize_signames(); |
152 | ||
b80f6443 JA |
153 | trap_list[EXIT_TRAP] = trap_list[DEBUG_TRAP] = trap_list[ERROR_TRAP] = trap_list[RETURN_TRAP] = (char *)NULL; |
154 | sigmodes[EXIT_TRAP] = sigmodes[DEBUG_TRAP] = sigmodes[ERROR_TRAP] = sigmodes[RETURN_TRAP] = SIG_INHERITED; | |
ccc6cda3 | 155 | original_signals[EXIT_TRAP] = IMPOSSIBLE_TRAP_HANDLER; |
726f6388 JA |
156 | |
157 | for (i = 1; i < NSIG; i++) | |
158 | { | |
159 | pending_traps[i] = 0; | |
160 | trap_list[i] = (char *)DEFAULT_SIG; | |
495aee44 | 161 | sigmodes[i] = SIG_INHERITED; /* XXX - only set, not used */ |
726f6388 JA |
162 | original_signals[i] = IMPOSSIBLE_TRAP_HANDLER; |
163 | } | |
164 | ||
165 | /* Show which signals are treated specially by the shell. */ | |
166 | #if defined (SIGCHLD) | |
0628567a | 167 | GETORIGSIG (SIGCHLD); |
726f6388 JA |
168 | sigmodes[SIGCHLD] |= (SIG_SPECIAL | SIG_NO_TRAP); |
169 | #endif /* SIGCHLD */ | |
170 | ||
0628567a | 171 | GETORIGSIG (SIGINT); |
726f6388 JA |
172 | sigmodes[SIGINT] |= SIG_SPECIAL; |
173 | ||
b72432fd JA |
174 | #if defined (__BEOS__) |
175 | /* BeOS sets SIGINT to SIG_IGN! */ | |
176 | original_signals[SIGINT] = SIG_DFL; | |
0628567a | 177 | sigmodes[SIGINT] &= ~SIG_HARD_IGNORE; |
b72432fd JA |
178 | #endif |
179 | ||
0628567a | 180 | GETORIGSIG (SIGQUIT); |
726f6388 JA |
181 | sigmodes[SIGQUIT] |= SIG_SPECIAL; |
182 | ||
183 | if (interactive) | |
184 | { | |
0628567a | 185 | GETORIGSIG (SIGTERM); |
726f6388 JA |
186 | sigmodes[SIGTERM] |= SIG_SPECIAL; |
187 | } | |
a0c0a00f CR |
188 | |
189 | get_original_tty_job_signals (); | |
726f6388 JA |
190 | } |
191 | ||
ac50fbac | 192 | #ifdef DEBUG |
bb70624e JA |
193 | /* Return a printable representation of the trap handler for SIG. */ |
194 | static char * | |
195 | trap_handler_string (sig) | |
196 | int sig; | |
197 | { | |
198 | if (trap_list[sig] == (char *)DEFAULT_SIG) | |
199 | return "DEFAULT_SIG"; | |
200 | else if (trap_list[sig] == (char *)IGNORE_SIG) | |
201 | return "IGNORE_SIG"; | |
202 | else if (trap_list[sig] == (char *)IMPOSSIBLE_TRAP_HANDLER) | |
203 | return "IMPOSSIBLE_TRAP_HANDLER"; | |
204 | else if (trap_list[sig]) | |
205 | return trap_list[sig]; | |
206 | else | |
207 | return "NULL"; | |
208 | } | |
209 | #endif | |
210 | ||
726f6388 JA |
211 | /* Return the print name of this signal. */ |
212 | char * | |
213 | signal_name (sig) | |
214 | int sig; | |
215 | { | |
cce855bc JA |
216 | char *ret; |
217 | ||
218 | /* on cygwin32, signal_names[sig] could be null */ | |
b80f6443 JA |
219 | ret = (sig >= BASH_NSIG || sig < 0 || signal_names[sig] == NULL) |
220 | ? _("invalid signal number") | |
221 | : signal_names[sig]; | |
222 | ||
cce855bc | 223 | return ret; |
726f6388 JA |
224 | } |
225 | ||
226 | /* Turn a string into a signal number, or a number into | |
227 | a signal number. If STRING is "2", "SIGINT", or "INT", | |
228 | then (int)2 is returned. Return NO_SIG if STRING doesn't | |
229 | contain a valid signal descriptor. */ | |
230 | int | |
b80f6443 | 231 | decode_signal (string, flags) |
726f6388 | 232 | char *string; |
b80f6443 | 233 | int flags; |
726f6388 | 234 | { |
7117c2d2 | 235 | intmax_t sig; |
b80f6443 | 236 | char *name; |
726f6388 | 237 | |
ccc6cda3 | 238 | if (legal_number (string, &sig)) |
f73dda09 | 239 | return ((sig >= 0 && sig < NSIG) ? (int)sig : NO_SIG); |
726f6388 | 240 | |
d233b485 CR |
241 | #if defined (SIGRTMIN) && defined (SIGRTMAX) |
242 | if (STREQN (string, "SIGRTMIN+", 9) || ((flags & DSIG_NOCASE) && strncasecmp (string, "SIGRTMIN+", 9) == 0)) | |
243 | { | |
244 | if (legal_number (string+9, &sig) && sig >= 0 && sig <= SIGRTMAX - SIGRTMIN) | |
245 | return (SIGRTMIN + sig); | |
246 | else | |
247 | return NO_SIG; | |
248 | } | |
249 | else if (STREQN (string, "RTMIN+", 6) || ((flags & DSIG_NOCASE) && strncasecmp (string, "RTMIN+", 6) == 0)) | |
250 | { | |
251 | if (legal_number (string+6, &sig) && sig >= 0 && sig <= SIGRTMAX - SIGRTMIN) | |
252 | return (SIGRTMIN + sig); | |
253 | else | |
254 | return NO_SIG; | |
255 | } | |
256 | #endif /* SIGRTMIN && SIGRTMAX */ | |
257 | ||
e8ce775d | 258 | /* A leading `SIG' may be omitted. */ |
f73dda09 | 259 | for (sig = 0; sig < BASH_NSIG; sig++) |
b72432fd | 260 | { |
b80f6443 JA |
261 | name = signal_names[sig]; |
262 | if (name == 0 || name[0] == '\0') | |
b72432fd | 263 | continue; |
b80f6443 | 264 | |
ac50fbac | 265 | /* Check name without the SIG prefix first case sensitively or |
b80f6443 JA |
266 | insensitively depending on whether flags includes DSIG_NOCASE */ |
267 | if (STREQN (name, "SIG", 3)) | |
268 | { | |
269 | name += 3; | |
270 | ||
271 | if ((flags & DSIG_NOCASE) && strcasecmp (string, name) == 0) | |
272 | return ((int)sig); | |
273 | else if ((flags & DSIG_NOCASE) == 0 && strcmp (string, name) == 0) | |
274 | return ((int)sig); | |
275 | /* If we can't use the `SIG' prefix to match, punt on this | |
276 | name now. */ | |
277 | else if ((flags & DSIG_SIGPREFIX) == 0) | |
278 | continue; | |
279 | } | |
280 | ||
281 | /* Check name with SIG prefix case sensitively or insensitively | |
282 | depending on whether flags includes DSIG_NOCASE */ | |
283 | name = signal_names[sig]; | |
284 | if ((flags & DSIG_NOCASE) && strcasecmp (string, name) == 0) | |
285 | return ((int)sig); | |
286 | else if ((flags & DSIG_NOCASE) == 0 && strcmp (string, name) == 0) | |
b72432fd JA |
287 | return ((int)sig); |
288 | } | |
726f6388 JA |
289 | |
290 | return (NO_SIG); | |
291 | } | |
292 | ||
293 | /* Non-zero when we catch a trapped signal. */ | |
ccc6cda3 | 294 | static int catch_flag; |
726f6388 JA |
295 | |
296 | void | |
297 | run_pending_traps () | |
298 | { | |
299 | register int sig; | |
a0c0a00f | 300 | int old_exit_value, x; |
8868edaf | 301 | int old_running; |
0001803f | 302 | WORD_LIST *save_subst_varlist; |
a0c0a00f | 303 | HASH_TABLE *save_tempenv; |
ac50fbac | 304 | sh_parser_state_t pstate; |
495aee44 CR |
305 | #if defined (ARRAY_VARS) |
306 | ARRAY *ps; | |
307 | #endif | |
726f6388 JA |
308 | |
309 | if (catch_flag == 0) /* simple optimization */ | |
310 | return; | |
311 | ||
ac50fbac CR |
312 | if (running_trap > 0) |
313 | { | |
314 | #if defined (DEBUG) | |
315 | internal_warning ("run_pending_traps: recursive invocation while running trap for signal %d", running_trap-1); | |
316 | #endif | |
a0c0a00f CR |
317 | #if defined (SIGWINCH) |
318 | if (running_trap == SIGWINCH+1 && pending_traps[SIGWINCH]) | |
319 | return; /* no recursive SIGWINCH trap invocations */ | |
ac50fbac | 320 | #endif |
d233b485 CR |
321 | /* could check for running the trap handler for the same signal here |
322 | (running_trap == sig+1) */ | |
323 | if (evalnest_max > 0 && evalnest > evalnest_max) | |
324 | { | |
325 | internal_error (_("trap handler: maximum trap handler level exceeded (%d)"), evalnest_max); | |
326 | evalnest = 0; | |
327 | jump_to_top_level (DISCARD); | |
328 | } | |
ac50fbac CR |
329 | } |
330 | ||
331 | catch_flag = trapped_signal_received = 0; | |
726f6388 JA |
332 | |
333 | /* Preserve $? when running trap. */ | |
a0c0a00f | 334 | trap_saved_exit_value = old_exit_value = last_command_exit_value; |
495aee44 CR |
335 | #if defined (ARRAY_VARS) |
336 | ps = save_pipestatus_array (); | |
337 | #endif | |
8868edaf | 338 | old_running = running_trap; |
726f6388 JA |
339 | |
340 | for (sig = 1; sig < NSIG; sig++) | |
341 | { | |
342 | /* XXX this could be made into a counter by using | |
28ef6c31 | 343 | while (pending_traps[sig]--) instead of the if statement. */ |
726f6388 JA |
344 | if (pending_traps[sig]) |
345 | { | |
ac50fbac CR |
346 | if (running_trap == sig+1) |
347 | /*continue*/; | |
726f6388 | 348 | |
ac50fbac | 349 | running_trap = sig + 1; |
726f6388 JA |
350 | |
351 | if (sig == SIGINT) | |
352 | { | |
ac50fbac | 353 | pending_traps[sig] = 0; /* XXX */ |
d233b485 CR |
354 | /* We don't modify evalnest here, since run_interrupt_trap() calls |
355 | _run_trap_internal, which does. */ | |
a0c0a00f | 356 | run_interrupt_trap (0); |
d233b485 | 357 | CLRINTERRUPT; /* interrupts don't stack */ |
726f6388 | 358 | } |
3185942a JA |
359 | #if defined (JOB_CONTROL) && defined (SIGCHLD) |
360 | else if (sig == SIGCHLD && | |
361 | trap_list[SIGCHLD] != (char *)IMPOSSIBLE_TRAP_HANDLER && | |
362 | (sigmodes[SIGCHLD] & SIG_INPROGRESS) == 0) | |
363 | { | |
ac50fbac | 364 | sigmodes[SIGCHLD] |= SIG_INPROGRESS; |
d233b485 CR |
365 | /* We modify evalnest here even though run_sigchld_trap can run |
366 | the trap action more than once */ | |
367 | evalnest++; | |
a0c0a00f CR |
368 | x = pending_traps[sig]; |
369 | pending_traps[sig] = 0; | |
370 | run_sigchld_trap (x); /* use as counter */ | |
371 | running_trap = 0; | |
d233b485 | 372 | evalnest--; |
ac50fbac | 373 | sigmodes[SIGCHLD] &= ~SIG_INPROGRESS; |
a0c0a00f CR |
374 | /* continue here rather than reset pending_traps[SIGCHLD] below in |
375 | case there are recursive calls to run_pending_traps and children | |
376 | have been reaped while run_sigchld_trap was running. */ | |
377 | continue; | |
ac50fbac CR |
378 | } |
379 | else if (sig == SIGCHLD && | |
380 | trap_list[SIGCHLD] == (char *)IMPOSSIBLE_TRAP_HANDLER && | |
381 | (sigmodes[SIGCHLD] & SIG_INPROGRESS) != 0) | |
382 | { | |
383 | /* This can happen when run_pending_traps is called while | |
384 | running a SIGCHLD trap handler. */ | |
385 | running_trap = 0; | |
386 | /* want to leave pending_traps[SIGCHLD] alone here */ | |
387 | continue; /* XXX */ | |
388 | } | |
389 | else if (sig == SIGCHLD && (sigmodes[SIGCHLD] & SIG_INPROGRESS)) | |
390 | { | |
391 | /* whoops -- print warning? */ | |
392 | running_trap = 0; /* XXX */ | |
393 | /* want to leave pending_traps[SIGCHLD] alone here */ | |
394 | continue; | |
3185942a JA |
395 | } |
396 | #endif | |
bb70624e JA |
397 | else if (trap_list[sig] == (char *)DEFAULT_SIG || |
398 | trap_list[sig] == (char *)IGNORE_SIG || | |
399 | trap_list[sig] == (char *)IMPOSSIBLE_TRAP_HANDLER) | |
400 | { | |
401 | /* This is possible due to a race condition. Say a bash | |
402 | process has SIGTERM trapped. A subshell is spawned | |
403 | using { list; } & and the parent does something and kills | |
404 | the subshell with SIGTERM. It's possible for the subshell | |
405 | to set pending_traps[SIGTERM] to 1 before the code in | |
406 | execute_cmd.c eventually calls restore_original_signals | |
407 | to reset the SIGTERM signal handler in the subshell. The | |
408 | next time run_pending_traps is called, pending_traps[SIGTERM] | |
409 | will be 1, but the trap handler in trap_list[SIGTERM] will | |
410 | be invalid (probably DEFAULT_SIG, but it could be IGNORE_SIG). | |
411 | Unless we catch this, the subshell will dump core when | |
412 | trap_list[SIGTERM] == DEFAULT_SIG, because DEFAULT_SIG is | |
413 | usually 0x0. */ | |
b80f6443 | 414 | internal_warning (_("run_pending_traps: bad value in trap_list[%d]: %p"), |
f73dda09 | 415 | sig, trap_list[sig]); |
bb70624e JA |
416 | if (trap_list[sig] == (char *)DEFAULT_SIG) |
417 | { | |
b80f6443 | 418 | internal_warning (_("run_pending_traps: signal handler is SIG_DFL, resending %d (%s) to myself"), sig, signal_name (sig)); |
bb70624e JA |
419 | kill (getpid (), sig); |
420 | } | |
421 | } | |
726f6388 | 422 | else |
bb70624e | 423 | { |
ac50fbac CR |
424 | /* XXX - should we use save_parser_state/restore_parser_state? */ |
425 | save_parser_state (&pstate); | |
0001803f CR |
426 | save_subst_varlist = subst_assign_varlist; |
427 | subst_assign_varlist = 0; | |
a0c0a00f CR |
428 | save_tempenv = temporary_env; |
429 | temporary_env = 0; /* traps should not run with temporary env */ | |
0001803f | 430 | |
ac50fbac CR |
431 | #if defined (JOB_CONTROL) |
432 | save_pipeline (1); /* XXX only provides one save level */ | |
433 | #endif | |
434 | /* XXX - set pending_traps[sig] = 0 here? */ | |
435 | pending_traps[sig] = 0; | |
d233b485 | 436 | evalnest++; |
ac50fbac | 437 | evalstring (savestring (trap_list[sig]), "trap", SEVAL_NONINT|SEVAL_NOHIST|SEVAL_RESETLINE); |
d233b485 | 438 | evalnest--; |
ac50fbac CR |
439 | #if defined (JOB_CONTROL) |
440 | restore_pipeline (1); | |
441 | #endif | |
0001803f CR |
442 | |
443 | subst_assign_varlist = save_subst_varlist; | |
ac50fbac | 444 | restore_parser_state (&pstate); |
a0c0a00f | 445 | temporary_env = save_tempenv; |
bb70624e | 446 | } |
726f6388 | 447 | |
ac50fbac | 448 | pending_traps[sig] = 0; /* XXX - move before evalstring? */ |
8868edaf | 449 | running_trap = old_running; |
726f6388 JA |
450 | } |
451 | } | |
452 | ||
495aee44 CR |
453 | #if defined (ARRAY_VARS) |
454 | restore_pipestatus_array (ps); | |
455 | #endif | |
726f6388 JA |
456 | last_command_exit_value = old_exit_value; |
457 | } | |
458 | ||
8868edaf CR |
459 | /* Set the private state variables noting that we received a signal SIG |
460 | for which we have a trap set. */ | |
461 | void | |
462 | set_trap_state (sig) | |
463 | int sig; | |
464 | { | |
465 | catch_flag = 1; | |
466 | pending_traps[sig]++; | |
467 | trapped_signal_received = sig; | |
468 | } | |
469 | ||
726f6388 JA |
470 | sighandler |
471 | trap_handler (sig) | |
472 | int sig; | |
473 | { | |
bb70624e JA |
474 | int oerrno; |
475 | ||
3185942a JA |
476 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) |
477 | { | |
478 | #if defined (DEBUG) | |
479 | internal_warning ("trap_handler: signal %d: signal not trapped", sig); | |
480 | #endif | |
481 | SIGRETURN (0); | |
482 | } | |
483 | ||
15409324 CR |
484 | /* This means we're in a subshell, but have not yet reset the handler for |
485 | trapped signals. We're not supposed to execute the trap in this situation; | |
486 | we should restore the original signal and resend the signal to ourselves | |
487 | to preserve the Posix "signal traps that are not being ignored shall be | |
488 | set to the default action" semantics. */ | |
489 | if ((subshell_environment & SUBSHELL_IGNTRAP) && trap_list[sig] != (char *)IGNORE_SIG) | |
490 | { | |
491 | sigset_t mask; | |
492 | ||
493 | /* Paranoia */ | |
494 | if (original_signals[sig] == IMPOSSIBLE_TRAP_HANDLER) | |
495 | original_signals[sig] = SIG_DFL; | |
496 | ||
497 | restore_signal (sig); | |
498 | ||
499 | /* Make sure we let the signal we just caught through */ | |
500 | sigemptyset (&mask); | |
501 | sigprocmask (SIG_SETMASK, (sigset_t *)NULL, &mask); | |
502 | sigdelset (&mask, sig); | |
503 | sigprocmask (SIG_SETMASK, &mask, (sigset_t *)NULL); | |
504 | ||
505 | kill (getpid (), sig); | |
506 | ||
507 | SIGRETURN (0); | |
508 | } | |
509 | ||
726f6388 JA |
510 | if ((sig >= NSIG) || |
511 | (trap_list[sig] == (char *)DEFAULT_SIG) || | |
512 | (trap_list[sig] == (char *)IGNORE_SIG)) | |
b80f6443 | 513 | programming_error (_("trap_handler: bad signal %d"), sig); |
726f6388 JA |
514 | else |
515 | { | |
28ef6c31 | 516 | oerrno = errno; |
ccc6cda3 | 517 | #if defined (MUST_REINSTALL_SIGHANDLERS) |
3185942a JA |
518 | # if defined (JOB_CONTROL) && defined (SIGCHLD) |
519 | if (sig != SIGCHLD) | |
520 | # endif /* JOB_CONTROL && SIGCHLD */ | |
726f6388 | 521 | set_signal_handler (sig, trap_handler); |
ccc6cda3 | 522 | #endif /* MUST_REINSTALL_SIGHANDLERS */ |
726f6388 | 523 | |
8868edaf | 524 | set_trap_state (sig); |
ac50fbac CR |
525 | |
526 | if (this_shell_builtin && (this_shell_builtin == wait_builtin)) | |
7117c2d2 JA |
527 | { |
528 | wait_signal_received = sig; | |
8868edaf | 529 | if (waiting_for_child && wait_intr_flag) |
a0c0a00f | 530 | sh_longjmp (wait_intr_buf, 1); |
7117c2d2 JA |
531 | } |
532 | ||
ac50fbac CR |
533 | #if defined (READLINE) |
534 | /* Set the event hook so readline will call it after the signal handlers | |
535 | finish executing, so if this interrupted character input we can get | |
536 | quick response. */ | |
8868edaf | 537 | if (RL_ISSTATE (RL_STATE_SIGHANDLER)) |
ac50fbac CR |
538 | bashline_set_event_hook (); |
539 | #endif | |
540 | ||
bb70624e | 541 | errno = oerrno; |
726f6388 | 542 | } |
d233b485 | 543 | |
ccc6cda3 | 544 | SIGRETURN (0); |
726f6388 JA |
545 | } |
546 | ||
ac50fbac | 547 | int |
8868edaf CR |
548 | next_pending_trap (start) |
549 | int start; | |
ac50fbac CR |
550 | { |
551 | register int i; | |
552 | ||
8868edaf | 553 | for (i = start; i < NSIG; i++) |
ac50fbac CR |
554 | if (pending_traps[i]) |
555 | return i; | |
556 | return -1; | |
557 | } | |
558 | ||
8868edaf CR |
559 | int |
560 | first_pending_trap () | |
561 | { | |
562 | return (next_pending_trap (1)); | |
563 | } | |
564 | ||
d233b485 CR |
565 | /* Return > 0 if any of the "real" signals (not fake signals like EXIT) are |
566 | trapped. */ | |
ac50fbac CR |
567 | int |
568 | any_signals_trapped () | |
569 | { | |
570 | register int i; | |
571 | ||
572 | for (i = 1; i < NSIG; i++) | |
573 | if (sigmodes[i] & SIG_TRAPPED) | |
574 | return i; | |
575 | return -1; | |
576 | } | |
577 | ||
8868edaf CR |
578 | void |
579 | clear_pending_traps () | |
580 | { | |
581 | register int i; | |
582 | ||
583 | for (i = 1; i < NSIG; i++) | |
584 | pending_traps[i] = 0; | |
585 | } | |
586 | ||
ac50fbac CR |
587 | void |
588 | check_signals () | |
589 | { | |
590 | CHECK_ALRM; /* set by the read builtin */ | |
591 | QUIT; | |
592 | } | |
593 | ||
594 | /* Convenience functions the rest of the shell can use */ | |
595 | void | |
596 | check_signals_and_traps () | |
597 | { | |
598 | check_signals (); | |
599 | ||
600 | run_pending_traps (); | |
601 | } | |
602 | ||
726f6388 | 603 | #if defined (JOB_CONTROL) && defined (SIGCHLD) |
cce855bc JA |
604 | |
605 | #ifdef INCLUDE_UNUSED | |
726f6388 JA |
606 | /* Make COMMAND_STRING be executed when SIGCHLD is caught. */ |
607 | void | |
608 | set_sigchld_trap (command_string) | |
609 | char *command_string; | |
610 | { | |
726f6388 JA |
611 | set_signal (SIGCHLD, command_string); |
612 | } | |
cce855bc | 613 | #endif |
726f6388 | 614 | |
95732b49 | 615 | /* Make COMMAND_STRING be executed when SIGCHLD is caught iff SIGCHLD |
3185942a JA |
616 | is not already trapped. IMPOSSIBLE_TRAP_HANDLER is used as a sentinel |
617 | to make sure that a SIGCHLD trap handler run via run_sigchld_trap can | |
618 | reset the disposition to the default and not have the original signal | |
619 | accidentally restored, undoing the user's command. */ | |
726f6388 JA |
620 | void |
621 | maybe_set_sigchld_trap (command_string) | |
622 | char *command_string; | |
623 | { | |
3185942a | 624 | if ((sigmodes[SIGCHLD] & SIG_TRAPPED) == 0 && trap_list[SIGCHLD] == (char *)IMPOSSIBLE_TRAP_HANDLER) |
726f6388 JA |
625 | set_signal (SIGCHLD, command_string); |
626 | } | |
3185942a JA |
627 | |
628 | /* Temporarily set the SIGCHLD trap string to IMPOSSIBLE_TRAP_HANDLER. Used | |
629 | as a sentinel in run_sigchld_trap and maybe_set_sigchld_trap to see whether | |
630 | or not a SIGCHLD trap handler reset SIGCHLD disposition to the default. */ | |
631 | void | |
632 | set_impossible_sigchld_trap () | |
633 | { | |
634 | restore_default_signal (SIGCHLD); | |
635 | change_signal (SIGCHLD, (char *)IMPOSSIBLE_TRAP_HANDLER); | |
636 | sigmodes[SIGCHLD] &= ~SIG_TRAPPED; /* maybe_set_sigchld_trap checks this */ | |
637 | } | |
ac50fbac CR |
638 | |
639 | /* Act as if we received SIGCHLD NCHILD times and increment | |
640 | pending_traps[SIGCHLD] by that amount. This allows us to still run the | |
641 | SIGCHLD trap once for each exited child. */ | |
642 | void | |
643 | queue_sigchld_trap (nchild) | |
644 | int nchild; | |
645 | { | |
646 | if (nchild > 0) | |
647 | { | |
648 | catch_flag = 1; | |
649 | pending_traps[SIGCHLD] += nchild; | |
650 | trapped_signal_received = SIGCHLD; | |
651 | } | |
652 | } | |
726f6388 JA |
653 | #endif /* JOB_CONTROL && SIGCHLD */ |
654 | ||
a0c0a00f CR |
655 | /* Set a trap for SIG only if SIG is not already trapped. */ |
656 | static inline void | |
657 | trap_if_untrapped (sig, command) | |
658 | int sig; | |
659 | char *command; | |
660 | { | |
661 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) | |
662 | set_signal (sig, command); | |
663 | } | |
664 | ||
ccc6cda3 JA |
665 | void |
666 | set_debug_trap (command) | |
726f6388 JA |
667 | char *command; |
668 | { | |
ccc6cda3 JA |
669 | set_signal (DEBUG_TRAP, command); |
670 | } | |
726f6388 | 671 | |
a0c0a00f CR |
672 | /* Separate function to call when functions and sourced files want to restore |
673 | the original version of the DEBUG trap before returning. Unless the -T | |
674 | option is set, source and shell function execution save the old debug trap | |
675 | and unset the trap. If the function or sourced file changes the DEBUG trap, | |
676 | SIG_TRAPPED will be set and we don't bother restoring the original trap string. | |
677 | This is used by both functions and the source builtin. */ | |
678 | void | |
679 | maybe_set_debug_trap (command) | |
680 | char *command; | |
681 | { | |
682 | trap_if_untrapped (DEBUG_TRAP, command); | |
683 | } | |
684 | ||
f73dda09 JA |
685 | void |
686 | set_error_trap (command) | |
687 | char *command; | |
688 | { | |
689 | set_signal (ERROR_TRAP, command); | |
690 | } | |
691 | ||
a0c0a00f CR |
692 | void |
693 | maybe_set_error_trap (command) | |
694 | char *command; | |
695 | { | |
696 | trap_if_untrapped (ERROR_TRAP, command); | |
697 | } | |
698 | ||
b80f6443 JA |
699 | void |
700 | set_return_trap (command) | |
701 | char *command; | |
702 | { | |
703 | set_signal (RETURN_TRAP, command); | |
704 | } | |
705 | ||
a0c0a00f CR |
706 | void |
707 | maybe_set_return_trap (command) | |
708 | char *command; | |
709 | { | |
710 | trap_if_untrapped (RETURN_TRAP, command); | |
711 | } | |
712 | ||
cce855bc | 713 | #ifdef INCLUDE_UNUSED |
ccc6cda3 JA |
714 | void |
715 | set_sigint_trap (command) | |
716 | char *command; | |
717 | { | |
726f6388 JA |
718 | set_signal (SIGINT, command); |
719 | } | |
cce855bc | 720 | #endif |
726f6388 JA |
721 | |
722 | /* Reset the SIGINT handler so that subshells that are doing `shellsy' | |
723 | things, like waiting for command substitution or executing commands | |
724 | in explicit subshells ( ( cmd ) ), can catch interrupts properly. */ | |
725 | SigHandler * | |
726 | set_sigint_handler () | |
727 | { | |
728 | if (sigmodes[SIGINT] & SIG_HARD_IGNORE) | |
729 | return ((SigHandler *)SIG_IGN); | |
730 | ||
731 | else if (sigmodes[SIGINT] & SIG_IGNORED) | |
ccc6cda3 JA |
732 | return ((SigHandler *)set_signal_handler (SIGINT, SIG_IGN)); /* XXX */ |
733 | ||
726f6388 JA |
734 | else if (sigmodes[SIGINT] & SIG_TRAPPED) |
735 | return ((SigHandler *)set_signal_handler (SIGINT, trap_handler)); | |
736 | ||
737 | /* The signal is not trapped, so set the handler to the shell's special | |
738 | interrupt handler. */ | |
739 | else if (interactive) /* XXX - was interactive_shell */ | |
740 | return (set_signal_handler (SIGINT, sigint_sighandler)); | |
741 | else | |
0628567a | 742 | return (set_signal_handler (SIGINT, termsig_sighandler)); |
726f6388 JA |
743 | } |
744 | ||
e8ce775d JA |
745 | /* Return the correct handler for signal SIG according to the values in |
746 | sigmodes[SIG]. */ | |
747 | SigHandler * | |
748 | trap_to_sighandler (sig) | |
749 | int sig; | |
750 | { | |
751 | if (sigmodes[sig] & (SIG_IGNORED|SIG_HARD_IGNORE)) | |
752 | return (SIG_IGN); | |
753 | else if (sigmodes[sig] & SIG_TRAPPED) | |
754 | return (trap_handler); | |
755 | else | |
756 | return (SIG_DFL); | |
757 | } | |
758 | ||
726f6388 JA |
759 | /* Set SIG to call STRING as a command. */ |
760 | void | |
761 | set_signal (sig, string) | |
762 | int sig; | |
763 | char *string; | |
764 | { | |
ac50fbac CR |
765 | sigset_t set, oset; |
766 | ||
f73dda09 | 767 | if (SPECIAL_TRAP (sig)) |
ccc6cda3 JA |
768 | { |
769 | change_signal (sig, savestring (string)); | |
d166f048 JA |
770 | if (sig == EXIT_TRAP && interactive == 0) |
771 | initialize_terminating_signals (); | |
ccc6cda3 JA |
772 | return; |
773 | } | |
774 | ||
726f6388 JA |
775 | /* A signal ignored on entry to the shell cannot be trapped or reset, but |
776 | no error is reported when attempting to do so. -- Posix.2 */ | |
777 | if (sigmodes[sig] & SIG_HARD_IGNORE) | |
778 | return; | |
779 | ||
780 | /* Make sure we have original_signals[sig] if the signal has not yet | |
781 | been trapped. */ | |
782 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) | |
783 | { | |
784 | /* If we aren't sure of the original value, check it. */ | |
785 | if (original_signals[sig] == IMPOSSIBLE_TRAP_HANDLER) | |
0628567a | 786 | GETORIGSIG (sig); |
726f6388 | 787 | if (original_signals[sig] == SIG_IGN) |
0628567a | 788 | return; |
726f6388 JA |
789 | } |
790 | ||
791 | /* Only change the system signal handler if SIG_NO_TRAP is not set. | |
792 | The trap command string is changed in either case. The shell signal | |
793 | handlers for SIGINT and SIGCHLD run the user specified traps in an | |
794 | environment in which it is safe to do so. */ | |
795 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) | |
796 | { | |
ac50fbac | 797 | BLOCK_SIGNAL (sig, set, oset); |
726f6388 JA |
798 | change_signal (sig, savestring (string)); |
799 | set_signal_handler (sig, trap_handler); | |
ac50fbac | 800 | UNBLOCK_SIGNAL (oset); |
726f6388 JA |
801 | } |
802 | else | |
803 | change_signal (sig, savestring (string)); | |
804 | } | |
805 | ||
806 | static void | |
807 | free_trap_command (sig) | |
808 | int sig; | |
809 | { | |
810 | if ((sigmodes[sig] & SIG_TRAPPED) && trap_list[sig] && | |
811 | (trap_list[sig] != (char *)IGNORE_SIG) && | |
812 | (trap_list[sig] != (char *)DEFAULT_SIG) && | |
813 | (trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER)) | |
814 | free (trap_list[sig]); | |
815 | } | |
ccc6cda3 | 816 | |
726f6388 JA |
817 | /* If SIG has a string assigned to it, get rid of it. Then give it |
818 | VALUE. */ | |
819 | static void | |
820 | change_signal (sig, value) | |
821 | int sig; | |
822 | char *value; | |
823 | { | |
d166f048 JA |
824 | if ((sigmodes[sig] & SIG_INPROGRESS) == 0) |
825 | free_trap_command (sig); | |
726f6388 JA |
826 | trap_list[sig] = value; |
827 | ||
828 | sigmodes[sig] |= SIG_TRAPPED; | |
829 | if (value == (char *)IGNORE_SIG) | |
830 | sigmodes[sig] |= SIG_IGNORED; | |
831 | else | |
832 | sigmodes[sig] &= ~SIG_IGNORED; | |
833 | if (sigmodes[sig] & SIG_INPROGRESS) | |
834 | sigmodes[sig] |= SIG_CHANGED; | |
835 | } | |
836 | ||
ac50fbac | 837 | void |
726f6388 JA |
838 | get_original_signal (sig) |
839 | int sig; | |
840 | { | |
841 | /* If we aren't sure the of the original value, then get it. */ | |
0001803f | 842 | if (sig > 0 && sig < NSIG && original_signals[sig] == (SigHandler *)IMPOSSIBLE_TRAP_HANDLER) |
0628567a | 843 | GETORIGSIG (sig); |
726f6388 JA |
844 | } |
845 | ||
495aee44 CR |
846 | void |
847 | get_all_original_signals () | |
848 | { | |
849 | register int i; | |
850 | ||
851 | for (i = 1; i < NSIG; i++) | |
852 | GET_ORIGINAL_SIGNAL (i); | |
853 | } | |
854 | ||
855 | void | |
856 | set_original_signal (sig, handler) | |
857 | int sig; | |
858 | SigHandler *handler; | |
859 | { | |
860 | if (sig > 0 && sig < NSIG && original_signals[sig] == (SigHandler *)IMPOSSIBLE_TRAP_HANDLER) | |
861 | SETORIGSIG (sig, handler); | |
862 | } | |
863 | ||
726f6388 JA |
864 | /* Restore the default action for SIG; i.e., the action the shell |
865 | would have taken before you used the trap command. This is called | |
866 | from trap_builtin (), which takes care to restore the handlers for | |
867 | the signals the shell treats specially. */ | |
868 | void | |
869 | restore_default_signal (sig) | |
870 | int sig; | |
871 | { | |
f73dda09 | 872 | if (SPECIAL_TRAP (sig)) |
726f6388 | 873 | { |
b80f6443 JA |
874 | if ((sig != DEBUG_TRAP && sig != ERROR_TRAP && sig != RETURN_TRAP) || |
875 | (sigmodes[sig] & SIG_INPROGRESS) == 0) | |
d166f048 | 876 | free_trap_command (sig); |
726f6388 JA |
877 | trap_list[sig] = (char *)NULL; |
878 | sigmodes[sig] &= ~SIG_TRAPPED; | |
d166f048 JA |
879 | if (sigmodes[sig] & SIG_INPROGRESS) |
880 | sigmodes[sig] |= SIG_CHANGED; | |
726f6388 JA |
881 | return; |
882 | } | |
883 | ||
884 | GET_ORIGINAL_SIGNAL (sig); | |
885 | ||
886 | /* A signal ignored on entry to the shell cannot be trapped or reset, but | |
887 | no error is reported when attempting to do so. Thanks Posix.2. */ | |
888 | if (sigmodes[sig] & SIG_HARD_IGNORE) | |
889 | return; | |
890 | ||
891 | /* If we aren't trapping this signal, don't bother doing anything else. */ | |
ac50fbac CR |
892 | /* We special-case SIGCHLD and IMPOSSIBLE_TRAP_HANDLER (see above) as a |
893 | sentinel to determine whether or not disposition is reset to the default | |
894 | while the trap handler is executing. */ | |
895 | if (((sigmodes[sig] & SIG_TRAPPED) == 0) && | |
896 | (sig != SIGCHLD || (sigmodes[sig] & SIG_INPROGRESS) == 0 || trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER)) | |
726f6388 JA |
897 | return; |
898 | ||
899 | /* Only change the signal handler for SIG if it allows it. */ | |
ccc6cda3 | 900 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) |
726f6388 JA |
901 | set_signal_handler (sig, original_signals[sig]); |
902 | ||
903 | /* Change the trap command in either case. */ | |
904 | change_signal (sig, (char *)DEFAULT_SIG); | |
905 | ||
906 | /* Mark the signal as no longer trapped. */ | |
907 | sigmodes[sig] &= ~SIG_TRAPPED; | |
908 | } | |
909 | ||
910 | /* Make this signal be ignored. */ | |
911 | void | |
912 | ignore_signal (sig) | |
913 | int sig; | |
914 | { | |
f73dda09 | 915 | if (SPECIAL_TRAP (sig) && ((sigmodes[sig] & SIG_IGNORED) == 0)) |
ccc6cda3 JA |
916 | { |
917 | change_signal (sig, (char *)IGNORE_SIG); | |
918 | return; | |
919 | } | |
920 | ||
726f6388 JA |
921 | GET_ORIGINAL_SIGNAL (sig); |
922 | ||
923 | /* A signal ignored on entry to the shell cannot be trapped or reset. | |
ccc6cda3 | 924 | No error is reported when the user attempts to do so. */ |
726f6388 JA |
925 | if (sigmodes[sig] & SIG_HARD_IGNORE) |
926 | return; | |
927 | ||
928 | /* If already trapped and ignored, no change necessary. */ | |
ccc6cda3 | 929 | if (sigmodes[sig] & SIG_IGNORED) |
726f6388 JA |
930 | return; |
931 | ||
932 | /* Only change the signal handler for SIG if it allows it. */ | |
ccc6cda3 | 933 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) |
726f6388 JA |
934 | set_signal_handler (sig, SIG_IGN); |
935 | ||
936 | /* Change the trap command in either case. */ | |
937 | change_signal (sig, (char *)IGNORE_SIG); | |
938 | } | |
939 | ||
940 | /* Handle the calling of "trap 0". The only sticky situation is when | |
941 | the command to be executed includes an "exit". This is why we have | |
942 | to provide our own place for top_level to jump to. */ | |
943 | int | |
944 | run_exit_trap () | |
945 | { | |
ccc6cda3 | 946 | char *trap_command; |
b80f6443 | 947 | int code, function_code, retval; |
495aee44 CR |
948 | #if defined (ARRAY_VARS) |
949 | ARRAY *ps; | |
950 | #endif | |
726f6388 | 951 | |
b80f6443 | 952 | trap_saved_exit_value = last_command_exit_value; |
495aee44 CR |
953 | #if defined (ARRAY_VARS) |
954 | ps = save_pipestatus_array (); | |
955 | #endif | |
b80f6443 | 956 | function_code = 0; |
726f6388 | 957 | |
ccc6cda3 JA |
958 | /* Run the trap only if signal 0 is trapped and not ignored, and we are not |
959 | currently running in the trap handler (call to exit in the list of | |
960 | commands given to trap 0). */ | |
961 | if ((sigmodes[EXIT_TRAP] & SIG_TRAPPED) && | |
962 | (sigmodes[EXIT_TRAP] & (SIG_IGNORED|SIG_INPROGRESS)) == 0) | |
726f6388 | 963 | { |
ccc6cda3 JA |
964 | trap_command = savestring (trap_list[EXIT_TRAP]); |
965 | sigmodes[EXIT_TRAP] &= ~SIG_TRAPPED; | |
966 | sigmodes[EXIT_TRAP] |= SIG_INPROGRESS; | |
726f6388 | 967 | |
b80f6443 JA |
968 | retval = trap_saved_exit_value; |
969 | running_trap = 1; | |
970 | ||
ac50fbac | 971 | code = setjmp_nosigs (top_level); |
726f6388 | 972 | |
b80f6443 JA |
973 | /* If we're in a function, make sure return longjmps come here, too. */ |
974 | if (return_catch_flag) | |
ac50fbac | 975 | function_code = setjmp_nosigs (return_catch); |
b80f6443 JA |
976 | |
977 | if (code == 0 && function_code == 0) | |
cce855bc JA |
978 | { |
979 | reset_parser (); | |
17345e5a | 980 | parse_and_execute (trap_command, "exit trap", SEVAL_NONINT|SEVAL_NOHIST|SEVAL_RESETLINE); |
cce855bc | 981 | } |
b80f6443 JA |
982 | else if (code == ERREXIT) |
983 | retval = last_command_exit_value; | |
726f6388 | 984 | else if (code == EXITPROG) |
b80f6443 JA |
985 | retval = last_command_exit_value; |
986 | else if (function_code != 0) | |
987 | retval = return_catch_value; | |
726f6388 | 988 | else |
b80f6443 JA |
989 | retval = trap_saved_exit_value; |
990 | ||
991 | running_trap = 0; | |
a0c0a00f CR |
992 | #if defined (ARRAY_VARS) |
993 | array_dispose (ps); | |
994 | #endif | |
995 | ||
b80f6443 | 996 | return retval; |
726f6388 JA |
997 | } |
998 | ||
495aee44 CR |
999 | #if defined (ARRAY_VARS) |
1000 | restore_pipestatus_array (ps); | |
1001 | #endif | |
b80f6443 | 1002 | return (trap_saved_exit_value); |
726f6388 JA |
1003 | } |
1004 | ||
ccc6cda3 JA |
1005 | void |
1006 | run_trap_cleanup (sig) | |
1007 | int sig; | |
1008 | { | |
8868edaf | 1009 | /* XXX - should we clean up trap_list[sig] == IMPOSSIBLE_TRAP_HANDLER? */ |
ccc6cda3 JA |
1010 | sigmodes[sig] &= ~(SIG_INPROGRESS|SIG_CHANGED); |
1011 | } | |
1012 | ||
ac50fbac CR |
1013 | #define RECURSIVE_SIG(s) (SPECIAL_TRAP(s) == 0) |
1014 | ||
ccc6cda3 | 1015 | /* Run a trap command for SIG. SIG is one of the signals the shell treats |
b80f6443 JA |
1016 | specially. Returns the exit status of the executed trap command list. */ |
1017 | static int | |
ccc6cda3 | 1018 | _run_trap_internal (sig, tag) |
726f6388 | 1019 | int sig; |
ccc6cda3 | 1020 | char *tag; |
726f6388 | 1021 | { |
ccc6cda3 | 1022 | char *trap_command, *old_trap; |
d233b485 | 1023 | int trap_exit_value; |
8868edaf CR |
1024 | volatile int save_return_catch_flag, function_code; |
1025 | int old_modes, old_running, old_int; | |
ac50fbac | 1026 | int flags; |
b80f6443 | 1027 | procenv_t save_return_catch; |
0001803f | 1028 | WORD_LIST *save_subst_varlist; |
a0c0a00f | 1029 | HASH_TABLE *save_tempenv; |
ac50fbac | 1030 | sh_parser_state_t pstate; |
495aee44 CR |
1031 | #if defined (ARRAY_VARS) |
1032 | ARRAY *ps; | |
1033 | #endif | |
ccc6cda3 | 1034 | |
8868edaf CR |
1035 | old_modes = old_running = -1; |
1036 | ||
b80f6443 | 1037 | trap_exit_value = function_code = 0; |
a0c0a00f | 1038 | trap_saved_exit_value = last_command_exit_value; |
ccc6cda3 JA |
1039 | /* Run the trap only if SIG is trapped and not ignored, and we are not |
1040 | currently executing in the trap handler. */ | |
1041 | if ((sigmodes[sig] & SIG_TRAPPED) && ((sigmodes[sig] & SIG_IGNORED) == 0) && | |
1042 | (trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER) && | |
8868edaf | 1043 | #if 1 |
ac50fbac CR |
1044 | /* Uncomment this to allow some special signals to recursively execute |
1045 | trap handlers. */ | |
1046 | (RECURSIVE_SIG (sig) || (sigmodes[sig] & SIG_INPROGRESS) == 0)) | |
1047 | #else | |
ccc6cda3 | 1048 | ((sigmodes[sig] & SIG_INPROGRESS) == 0)) |
ac50fbac | 1049 | #endif |
ccc6cda3 JA |
1050 | { |
1051 | old_trap = trap_list[sig]; | |
8868edaf CR |
1052 | old_modes = sigmodes[sig]; |
1053 | old_running = running_trap; | |
1054 | ||
ccc6cda3 JA |
1055 | sigmodes[sig] |= SIG_INPROGRESS; |
1056 | sigmodes[sig] &= ~SIG_CHANGED; /* just to be sure */ | |
1057 | trap_command = savestring (old_trap); | |
1058 | ||
1059 | running_trap = sig + 1; | |
ac50fbac | 1060 | |
a0c0a00f CR |
1061 | old_int = interrupt_state; /* temporarily suppress pending interrupts */ |
1062 | CLRINTERRUPT; | |
1063 | ||
495aee44 CR |
1064 | #if defined (ARRAY_VARS) |
1065 | ps = save_pipestatus_array (); | |
1066 | #endif | |
bb70624e | 1067 | |
ac50fbac | 1068 | save_parser_state (&pstate); |
0001803f CR |
1069 | save_subst_varlist = subst_assign_varlist; |
1070 | subst_assign_varlist = 0; | |
a0c0a00f CR |
1071 | save_tempenv = temporary_env; |
1072 | temporary_env = 0; /* traps should not run with temporary env */ | |
b80f6443 | 1073 | |
ac50fbac | 1074 | #if defined (JOB_CONTROL) |
7f89f4cd CR |
1075 | if (sig != DEBUG_TRAP) /* run_debug_trap does this */ |
1076 | save_pipeline (1); /* XXX only provides one save level */ | |
ac50fbac CR |
1077 | #endif |
1078 | ||
b80f6443 JA |
1079 | /* If we're in a function, make sure return longjmps come here, too. */ |
1080 | save_return_catch_flag = return_catch_flag; | |
1081 | if (return_catch_flag) | |
1082 | { | |
1083 | COPY_PROCENV (return_catch, save_return_catch); | |
ac50fbac | 1084 | function_code = setjmp_nosigs (return_catch); |
b80f6443 JA |
1085 | } |
1086 | ||
17345e5a | 1087 | flags = SEVAL_NONINT|SEVAL_NOHIST; |
89a92869 | 1088 | if (sig != DEBUG_TRAP && sig != RETURN_TRAP && sig != ERROR_TRAP) |
17345e5a | 1089 | flags |= SEVAL_RESETLINE; |
d233b485 | 1090 | evalnest++; |
b80f6443 | 1091 | if (function_code == 0) |
a0c0a00f CR |
1092 | { |
1093 | parse_and_execute (trap_command, tag, flags); | |
1094 | trap_exit_value = last_command_exit_value; | |
1095 | } | |
1096 | else | |
1097 | trap_exit_value = return_catch_value; | |
d233b485 | 1098 | evalnest--; |
ac50fbac CR |
1099 | |
1100 | #if defined (JOB_CONTROL) | |
7f89f4cd CR |
1101 | if (sig != DEBUG_TRAP) /* run_debug_trap does this */ |
1102 | restore_pipeline (1); | |
ac50fbac | 1103 | #endif |
bb70624e | 1104 | |
0001803f | 1105 | subst_assign_varlist = save_subst_varlist; |
ac50fbac | 1106 | restore_parser_state (&pstate); |
0001803f | 1107 | |
495aee44 CR |
1108 | #if defined (ARRAY_VARS) |
1109 | restore_pipestatus_array (ps); | |
1110 | #endif | |
a0c0a00f CR |
1111 | |
1112 | temporary_env = save_tempenv; | |
ccc6cda3 | 1113 | |
8868edaf CR |
1114 | if ((old_modes & SIG_INPROGRESS) == 0) |
1115 | sigmodes[sig] &= ~SIG_INPROGRESS; | |
1116 | ||
1117 | running_trap = old_running; | |
a0c0a00f | 1118 | interrupt_state = old_int; |
ccc6cda3 JA |
1119 | |
1120 | if (sigmodes[sig] & SIG_CHANGED) | |
1121 | { | |
b80f6443 JA |
1122 | #if 0 |
1123 | /* Special traps like EXIT, DEBUG, RETURN are handled explicitly in | |
1124 | the places where they can be changed using unwind-protects. For | |
1125 | example, look at execute_cmd.c:execute_function(). */ | |
1126 | if (SPECIAL_TRAP (sig) == 0) | |
1127 | #endif | |
1128 | free (old_trap); | |
ccc6cda3 | 1129 | sigmodes[sig] &= ~SIG_CHANGED; |
d233b485 CR |
1130 | |
1131 | CHECK_TERMSIG; /* some pathological conditions lead here */ | |
ccc6cda3 | 1132 | } |
b80f6443 JA |
1133 | |
1134 | if (save_return_catch_flag) | |
1135 | { | |
1136 | return_catch_flag = save_return_catch_flag; | |
1137 | return_catch_value = trap_exit_value; | |
1138 | COPY_PROCENV (save_return_catch, return_catch); | |
1139 | if (function_code) | |
a0c0a00f CR |
1140 | { |
1141 | #if 0 | |
1142 | from_return_trap = sig == RETURN_TRAP; | |
1143 | #endif | |
1144 | sh_longjmp (return_catch, 1); | |
1145 | } | |
b80f6443 | 1146 | } |
ccc6cda3 | 1147 | } |
b80f6443 JA |
1148 | |
1149 | return trap_exit_value; | |
ccc6cda3 JA |
1150 | } |
1151 | ||
b80f6443 | 1152 | int |
ccc6cda3 JA |
1153 | run_debug_trap () |
1154 | { | |
d233b485 | 1155 | int trap_exit_value, old_verbose; |
89a92869 | 1156 | pid_t save_pgrp; |
d233b485 | 1157 | #if defined (PGRP_PIPE) |
89a92869 | 1158 | int save_pipe[2]; |
d233b485 | 1159 | #endif |
b80f6443 JA |
1160 | |
1161 | /* XXX - question: should the DEBUG trap inherit the RETURN trap? */ | |
1162 | trap_exit_value = 0; | |
1163 | if ((sigmodes[DEBUG_TRAP] & SIG_TRAPPED) && ((sigmodes[DEBUG_TRAP] & SIG_IGNORED) == 0) && ((sigmodes[DEBUG_TRAP] & SIG_INPROGRESS) == 0)) | |
1164 | { | |
89a92869 CR |
1165 | #if defined (JOB_CONTROL) |
1166 | save_pgrp = pipeline_pgrp; | |
1167 | pipeline_pgrp = 0; | |
1168 | save_pipeline (1); | |
1169 | # if defined (PGRP_PIPE) | |
1170 | save_pgrp_pipe (save_pipe, 1); | |
1171 | # endif | |
1172 | stop_making_children (); | |
1173 | #endif | |
1174 | ||
d233b485 | 1175 | old_verbose = echo_input_at_read; |
8868edaf | 1176 | echo_input_at_read = suppress_debug_trap_verbose ? 0 : echo_input_at_read; |
d233b485 | 1177 | |
b80f6443 | 1178 | trap_exit_value = _run_trap_internal (DEBUG_TRAP, "debug trap"); |
89a92869 | 1179 | |
d233b485 CR |
1180 | echo_input_at_read = old_verbose; |
1181 | ||
89a92869 CR |
1182 | #if defined (JOB_CONTROL) |
1183 | pipeline_pgrp = save_pgrp; | |
1184 | restore_pipeline (1); | |
1185 | # if defined (PGRP_PIPE) | |
1186 | close_pgrp_pipe (); | |
1187 | restore_pgrp_pipe (save_pipe); | |
1188 | # endif | |
d233b485 | 1189 | if (pipeline_pgrp > 0 && ((subshell_environment & (SUBSHELL_ASYNC|SUBSHELL_PIPE)) == 0)) |
89a92869 | 1190 | give_terminal_to (pipeline_pgrp, 1); |
d233b485 | 1191 | |
89a92869 CR |
1192 | notify_and_cleanup (); |
1193 | #endif | |
b80f6443 JA |
1194 | |
1195 | #if defined (DEBUGGER) | |
1196 | /* If we're in the debugger and the DEBUG trap returns 2 while we're in | |
1197 | a function or sourced script, we force a `return'. */ | |
1198 | if (debugging_mode && trap_exit_value == 2 && return_catch_flag) | |
1199 | { | |
1200 | return_catch_value = trap_exit_value; | |
a0c0a00f | 1201 | sh_longjmp (return_catch, 1); |
b80f6443 JA |
1202 | } |
1203 | #endif | |
1204 | } | |
1205 | return trap_exit_value; | |
ccc6cda3 JA |
1206 | } |
1207 | ||
f73dda09 JA |
1208 | void |
1209 | run_error_trap () | |
1210 | { | |
b80f6443 | 1211 | if ((sigmodes[ERROR_TRAP] & SIG_TRAPPED) && ((sigmodes[ERROR_TRAP] & SIG_IGNORED) == 0) && (sigmodes[ERROR_TRAP] & SIG_INPROGRESS) == 0) |
f73dda09 JA |
1212 | _run_trap_internal (ERROR_TRAP, "error trap"); |
1213 | } | |
1214 | ||
b80f6443 JA |
1215 | void |
1216 | run_return_trap () | |
1217 | { | |
1218 | int old_exit_value; | |
1219 | ||
95732b49 JA |
1220 | #if 0 |
1221 | if ((sigmodes[DEBUG_TRAP] & SIG_TRAPPED) && (sigmodes[DEBUG_TRAP] & SIG_INPROGRESS)) | |
1222 | return; | |
1223 | #endif | |
1224 | ||
b80f6443 JA |
1225 | if ((sigmodes[RETURN_TRAP] & SIG_TRAPPED) && ((sigmodes[RETURN_TRAP] & SIG_IGNORED) == 0) && (sigmodes[RETURN_TRAP] & SIG_INPROGRESS) == 0) |
1226 | { | |
1227 | old_exit_value = last_command_exit_value; | |
1228 | _run_trap_internal (RETURN_TRAP, "return trap"); | |
1229 | last_command_exit_value = old_exit_value; | |
1230 | } | |
1231 | } | |
1232 | ||
ccc6cda3 JA |
1233 | /* Run a trap set on SIGINT. This is called from throw_to_top_level (), and |
1234 | declared here to localize the trap functions. */ | |
1235 | void | |
a0c0a00f CR |
1236 | run_interrupt_trap (will_throw) |
1237 | int will_throw; /* from throw_to_top_level? */ | |
ccc6cda3 | 1238 | { |
a0c0a00f CR |
1239 | if (will_throw && running_trap > 0) |
1240 | run_trap_cleanup (running_trap - 1); | |
8868edaf CR |
1241 | pending_traps[SIGINT] = 0; /* run_pending_traps does this */ |
1242 | catch_flag = 0; | |
ccc6cda3 | 1243 | _run_trap_internal (SIGINT, "interrupt trap"); |
726f6388 JA |
1244 | } |
1245 | ||
1246 | /* Free all the allocated strings in the list of traps and reset the trap | |
0001803f CR |
1247 | values to the default. Intended to be called from subshells that want |
1248 | to complete work done by reset_signal_handlers upon execution of a | |
ac50fbac CR |
1249 | subsequent `trap' command that changes a signal's disposition. We need |
1250 | to make sure that we duplicate the behavior of | |
1251 | reset_or_restore_signal_handlers and not change the disposition of signals | |
1252 | that are set to be ignored. */ | |
726f6388 JA |
1253 | void |
1254 | free_trap_strings () | |
1255 | { | |
1256 | register int i; | |
1257 | ||
a0c0a00f | 1258 | for (i = 0; i < NSIG; i++) |
ac50fbac CR |
1259 | { |
1260 | if (trap_list[i] != (char *)IGNORE_SIG) | |
1261 | free_trap_string (i); | |
1262 | } | |
a0c0a00f CR |
1263 | for (i = NSIG; i < BASH_NSIG; i++) |
1264 | { | |
1265 | /* Don't free the trap string if the subshell inherited the trap */ | |
1266 | if ((sigmodes[i] & SIG_TRAPPED) == 0) | |
1267 | { | |
1268 | free_trap_string (i); | |
1269 | trap_list[i] = (char *)NULL; | |
1270 | } | |
1271 | } | |
726f6388 | 1272 | } |
0001803f CR |
1273 | |
1274 | /* Free a trap command string associated with SIG without changing signal | |
1275 | disposition. Intended to be called from free_trap_strings() */ | |
1276 | static void | |
1277 | free_trap_string (sig) | |
1278 | int sig; | |
1279 | { | |
1280 | change_signal (sig, (char *)DEFAULT_SIG); | |
d233b485 | 1281 | sigmodes[sig] &= ~SIG_TRAPPED; /* XXX - SIG_INPROGRESS? */ |
0001803f | 1282 | } |
726f6388 | 1283 | |
495aee44 CR |
1284 | /* Reset the handler for SIG to the original value but leave the trap string |
1285 | in place. */ | |
726f6388 JA |
1286 | static void |
1287 | reset_signal (sig) | |
1288 | int sig; | |
1289 | { | |
1290 | set_signal_handler (sig, original_signals[sig]); | |
d233b485 | 1291 | sigmodes[sig] &= ~SIG_TRAPPED; /* XXX - SIG_INPROGRESS? */ |
726f6388 JA |
1292 | } |
1293 | ||
ccc6cda3 JA |
1294 | /* Set the handler signal SIG to the original and free any trap |
1295 | command associated with it. */ | |
1296 | static void | |
1297 | restore_signal (sig) | |
1298 | int sig; | |
726f6388 | 1299 | { |
ccc6cda3 JA |
1300 | set_signal_handler (sig, original_signals[sig]); |
1301 | change_signal (sig, (char *)DEFAULT_SIG); | |
1302 | sigmodes[sig] &= ~SIG_TRAPPED; | |
726f6388 JA |
1303 | } |
1304 | ||
ccc6cda3 JA |
1305 | static void |
1306 | reset_or_restore_signal_handlers (reset) | |
f73dda09 | 1307 | sh_resetsig_func_t *reset; |
726f6388 JA |
1308 | { |
1309 | register int i; | |
1310 | ||
ccc6cda3 JA |
1311 | /* Take care of the exit trap first */ |
1312 | if (sigmodes[EXIT_TRAP] & SIG_TRAPPED) | |
726f6388 | 1313 | { |
d233b485 | 1314 | sigmodes[EXIT_TRAP] &= ~SIG_TRAPPED; /* XXX - SIG_INPROGRESS? */ |
95732b49 JA |
1315 | if (reset != reset_signal) |
1316 | { | |
1317 | free_trap_command (EXIT_TRAP); | |
1318 | trap_list[EXIT_TRAP] = (char *)NULL; | |
1319 | } | |
726f6388 | 1320 | } |
b80f6443 | 1321 | |
726f6388 JA |
1322 | for (i = 1; i < NSIG; i++) |
1323 | { | |
ccc6cda3 | 1324 | if (sigmodes[i] & SIG_TRAPPED) |
726f6388 JA |
1325 | { |
1326 | if (trap_list[i] == (char *)IGNORE_SIG) | |
1327 | set_signal_handler (i, SIG_IGN); | |
1328 | else | |
ccc6cda3 | 1329 | (*reset) (i); |
726f6388 | 1330 | } |
ccc6cda3 JA |
1331 | else if (sigmodes[i] & SIG_SPECIAL) |
1332 | (*reset) (i); | |
a0c0a00f | 1333 | pending_traps[i] = 0; /* XXX */ |
726f6388 | 1334 | } |
f73dda09 JA |
1335 | |
1336 | /* Command substitution and other child processes don't inherit the | |
b80f6443 JA |
1337 | debug, error, or return traps. If we're in the debugger, and the |
1338 | `functrace' or `errtrace' options have been set, then let command | |
1339 | substitutions inherit them. Let command substitution inherit the | |
1340 | RETURN trap if we're in the debugger and tracing functions. */ | |
0628567a JA |
1341 | if (function_trace_mode == 0) |
1342 | { | |
1343 | sigmodes[DEBUG_TRAP] &= ~SIG_TRAPPED; | |
1344 | sigmodes[RETURN_TRAP] &= ~SIG_TRAPPED; | |
1345 | } | |
1346 | if (error_trace_mode == 0) | |
b80f6443 | 1347 | sigmodes[ERROR_TRAP] &= ~SIG_TRAPPED; |
726f6388 JA |
1348 | } |
1349 | ||
f73dda09 | 1350 | /* Reset trapped signals to their original values, but don't free the |
495aee44 CR |
1351 | trap strings. Called by the command substitution code and other places |
1352 | that create a "subshell environment". */ | |
726f6388 | 1353 | void |
ccc6cda3 | 1354 | reset_signal_handlers () |
726f6388 | 1355 | { |
ccc6cda3 JA |
1356 | reset_or_restore_signal_handlers (reset_signal); |
1357 | } | |
726f6388 | 1358 | |
ccc6cda3 JA |
1359 | /* Reset all trapped signals to their original values. Signals set to be |
1360 | ignored with trap '' SIGNAL should be ignored, so we make sure that they | |
1361 | are. Called by child processes after they are forked. */ | |
1362 | void | |
1363 | restore_original_signals () | |
1364 | { | |
1365 | reset_or_restore_signal_handlers (restore_signal); | |
726f6388 JA |
1366 | } |
1367 | ||
1368 | /* If a trap handler exists for signal SIG, then call it; otherwise just | |
ac50fbac | 1369 | return failure. Returns 1 if it called the trap handler. */ |
726f6388 JA |
1370 | int |
1371 | maybe_call_trap_handler (sig) | |
1372 | int sig; | |
1373 | { | |
1374 | /* Call the trap handler for SIG if the signal is trapped and not ignored. */ | |
ccc6cda3 | 1375 | if ((sigmodes[sig] & SIG_TRAPPED) && ((sigmodes[sig] & SIG_IGNORED) == 0)) |
726f6388 JA |
1376 | { |
1377 | switch (sig) | |
1378 | { | |
1379 | case SIGINT: | |
a0c0a00f | 1380 | run_interrupt_trap (0); |
726f6388 | 1381 | break; |
ccc6cda3 | 1382 | case EXIT_TRAP: |
726f6388 JA |
1383 | run_exit_trap (); |
1384 | break; | |
ccc6cda3 JA |
1385 | case DEBUG_TRAP: |
1386 | run_debug_trap (); | |
1387 | break; | |
f73dda09 JA |
1388 | case ERROR_TRAP: |
1389 | run_error_trap (); | |
1390 | break; | |
726f6388 JA |
1391 | default: |
1392 | trap_handler (sig); | |
1393 | break; | |
1394 | } | |
1395 | return (1); | |
1396 | } | |
1397 | else | |
1398 | return (0); | |
1399 | } | |
1400 | ||
1401 | int | |
1402 | signal_is_trapped (sig) | |
1403 | int sig; | |
1404 | { | |
1405 | return (sigmodes[sig] & SIG_TRAPPED); | |
1406 | } | |
1407 | ||
ac50fbac CR |
1408 | int |
1409 | signal_is_pending (sig) | |
1410 | int sig; | |
1411 | { | |
1412 | return (pending_traps[sig]); | |
1413 | } | |
1414 | ||
726f6388 JA |
1415 | int |
1416 | signal_is_special (sig) | |
1417 | int sig; | |
1418 | { | |
1419 | return (sigmodes[sig] & SIG_SPECIAL); | |
1420 | } | |
1421 | ||
1422 | int | |
1423 | signal_is_ignored (sig) | |
1424 | int sig; | |
1425 | { | |
1426 | return (sigmodes[sig] & SIG_IGNORED); | |
1427 | } | |
1428 | ||
495aee44 CR |
1429 | int |
1430 | signal_is_hard_ignored (sig) | |
1431 | int sig; | |
1432 | { | |
1433 | return (sigmodes[sig] & SIG_HARD_IGNORE); | |
1434 | } | |
1435 | ||
726f6388 | 1436 | void |
ac50fbac | 1437 | set_signal_hard_ignored (sig) |
726f6388 JA |
1438 | int sig; |
1439 | { | |
1440 | sigmodes[sig] |= SIG_HARD_IGNORE; | |
ccc6cda3 | 1441 | original_signals[sig] = SIG_IGN; |
726f6388 | 1442 | } |
95732b49 | 1443 | |
ac50fbac CR |
1444 | void |
1445 | set_signal_ignored (sig) | |
1446 | int sig; | |
1447 | { | |
1448 | original_signals[sig] = SIG_IGN; | |
1449 | } | |
1450 | ||
95732b49 JA |
1451 | int |
1452 | signal_in_progress (sig) | |
1453 | int sig; | |
1454 | { | |
1455 | return (sigmodes[sig] & SIG_INPROGRESS); | |
1456 | } | |
8868edaf CR |
1457 | |
1458 | #if 0 /* TAG: bash-5.2 */ | |
1459 | int | |
1460 | block_trapped_signals (maskp, omaskp) | |
1461 | sigset_t *maskp; | |
1462 | sigset_t *omaskp; | |
1463 | { | |
1464 | int i; | |
1465 | ||
1466 | sigemptyset (maskp); | |
1467 | for (i = 1; i < NSIG; i++) | |
1468 | if (sigmodes[i] & SIG_TRAPPED) | |
1469 | sigaddset (maskp, i); | |
1470 | return (sigprocmask (SIG_BLOCK, maskp, omaskp)); | |
1471 | } | |
1472 | ||
1473 | int | |
1474 | unblock_trapped_signals (maskp) | |
1475 | sigset_t *maskp; | |
1476 | { | |
1477 | return (sigprocmask (SIG_SETMASK, maskp, 0)); | |
1478 | } | |
1479 | #endif |