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Commit | Line | Data |
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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 | ||
ac50fbac | 4 | /* Copyright (C) 1987-2013 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" |
b80f6443 | 41 | #include "flags.h" |
bb70624e | 42 | #include "input.h" /* for save_token_state, restore_token_state */ |
3185942a | 43 | #include "jobs.h" |
726f6388 | 44 | #include "signames.h" |
7117c2d2 | 45 | #include "builtins.h" |
ccc6cda3 | 46 | #include "builtins/common.h" |
7117c2d2 | 47 | #include "builtins/builtext.h" |
726f6388 | 48 | |
ac50fbac CR |
49 | #if defined (READLINE) |
50 | # include <readline/readline.h> | |
51 | # include "bashline.h" | |
52 | #endif | |
53 | ||
bb70624e JA |
54 | #ifndef errno |
55 | extern int errno; | |
56 | #endif | |
57 | ||
726f6388 JA |
58 | /* Flags which describe the current handling state of a signal. */ |
59 | #define SIG_INHERITED 0x0 /* Value inherited from parent. */ | |
60 | #define SIG_TRAPPED 0x1 /* Currently trapped. */ | |
61 | #define SIG_HARD_IGNORE 0x2 /* Signal was ignored on shell entry. */ | |
62 | #define SIG_SPECIAL 0x4 /* Treat this signal specially. */ | |
63 | #define SIG_NO_TRAP 0x8 /* Signal cannot be trapped. */ | |
ccc6cda3 JA |
64 | #define SIG_INPROGRESS 0x10 /* Signal handler currently executing. */ |
65 | #define SIG_CHANGED 0x20 /* Trap value changed in trap handler. */ | |
66 | #define SIG_IGNORED 0x40 /* The signal is currently being ignored. */ | |
726f6388 | 67 | |
b80f6443 | 68 | #define SPECIAL_TRAP(s) ((s) == EXIT_TRAP || (s) == DEBUG_TRAP || (s) == ERROR_TRAP || (s) == RETURN_TRAP) |
f73dda09 | 69 | |
726f6388 | 70 | /* An array of such flags, one for each signal, describing what the |
ccc6cda3 JA |
71 | shell will do with a signal. DEBUG_TRAP == NSIG; some code below |
72 | assumes this. */ | |
f73dda09 JA |
73 | static int sigmodes[BASH_NSIG]; |
74 | ||
75 | static void free_trap_command __P((int)); | |
76 | static void change_signal __P((int, char *)); | |
77 | ||
b80f6443 | 78 | static int _run_trap_internal __P((int, char *)); |
726f6388 | 79 | |
0001803f | 80 | static void free_trap_string __P((int)); |
f73dda09 JA |
81 | static void reset_signal __P((int)); |
82 | static void restore_signal __P((int)); | |
83 | static void reset_or_restore_signal_handlers __P((sh_resetsig_func_t *)); | |
726f6388 JA |
84 | |
85 | /* Variables used here but defined in other files. */ | |
726f6388 | 86 | extern int last_command_exit_value; |
d166f048 | 87 | extern int line_number; |
726f6388 | 88 | |
ac50fbac CR |
89 | extern int sigalrm_seen; |
90 | extern procenv_t alrmbuf; | |
91 | ||
b80f6443 | 92 | extern char *this_command_name; |
7117c2d2 JA |
93 | extern sh_builtin_func_t *this_shell_builtin; |
94 | extern procenv_t wait_intr_buf; | |
b80f6443 JA |
95 | extern int return_catch_flag, return_catch_value; |
96 | extern int subshell_level; | |
0001803f | 97 | extern WORD_LIST *subst_assign_varlist; |
7117c2d2 | 98 | |
726f6388 JA |
99 | /* The list of things to do originally, before we started trapping. */ |
100 | SigHandler *original_signals[NSIG]; | |
101 | ||
102 | /* For each signal, a slot for a string, which is a command to be | |
ac50fbac | 103 | executed when that signal is received. The slot can also contain |
726f6388 JA |
104 | DEFAULT_SIG, which means do whatever you were going to do before |
105 | you were so rudely interrupted, or IGNORE_SIG, which says ignore | |
106 | this signal. */ | |
f73dda09 | 107 | char *trap_list[BASH_NSIG]; |
726f6388 JA |
108 | |
109 | /* A bitmap of signals received for which we have trap handlers. */ | |
110 | int pending_traps[NSIG]; | |
111 | ||
ccc6cda3 JA |
112 | /* Set to the number of the signal we're running the trap for + 1. |
113 | Used in execute_cmd.c and builtins/common.c to clean up when | |
114 | parse_and_execute does not return normally after executing the | |
115 | trap command (e.g., when `return' is executed in the trap command). */ | |
116 | int running_trap; | |
117 | ||
b80f6443 JA |
118 | /* Set to last_command_exit_value before running a trap. */ |
119 | int trap_saved_exit_value; | |
d166f048 | 120 | |
7117c2d2 JA |
121 | /* The (trapped) signal received while executing in the `wait' builtin */ |
122 | int wait_signal_received; | |
123 | ||
ac50fbac CR |
124 | int trapped_signal_received; |
125 | ||
0628567a JA |
126 | #define GETORIGSIG(sig) \ |
127 | do { \ | |
128 | original_signals[sig] = (SigHandler *)set_signal_handler (sig, SIG_DFL); \ | |
129 | set_signal_handler (sig, original_signals[sig]); \ | |
130 | if (original_signals[sig] == SIG_IGN) \ | |
131 | sigmodes[sig] |= SIG_HARD_IGNORE; \ | |
132 | } while (0) | |
133 | ||
495aee44 CR |
134 | #define SETORIGSIG(sig,handler) \ |
135 | do { \ | |
136 | original_signals[sig] = handler; \ | |
137 | if (original_signals[sig] == SIG_IGN) \ | |
138 | sigmodes[sig] |= SIG_HARD_IGNORE; \ | |
139 | } while (0) | |
140 | ||
0628567a JA |
141 | #define GET_ORIGINAL_SIGNAL(sig) \ |
142 | if (sig && sig < NSIG && original_signals[sig] == IMPOSSIBLE_TRAP_HANDLER) \ | |
143 | GETORIGSIG(sig) | |
144 | ||
726f6388 JA |
145 | void |
146 | initialize_traps () | |
147 | { | |
148 | register int i; | |
149 | ||
0628567a JA |
150 | initialize_signames(); |
151 | ||
b80f6443 JA |
152 | trap_list[EXIT_TRAP] = trap_list[DEBUG_TRAP] = trap_list[ERROR_TRAP] = trap_list[RETURN_TRAP] = (char *)NULL; |
153 | sigmodes[EXIT_TRAP] = sigmodes[DEBUG_TRAP] = sigmodes[ERROR_TRAP] = sigmodes[RETURN_TRAP] = SIG_INHERITED; | |
ccc6cda3 | 154 | original_signals[EXIT_TRAP] = IMPOSSIBLE_TRAP_HANDLER; |
726f6388 JA |
155 | |
156 | for (i = 1; i < NSIG; i++) | |
157 | { | |
158 | pending_traps[i] = 0; | |
159 | trap_list[i] = (char *)DEFAULT_SIG; | |
495aee44 | 160 | sigmodes[i] = SIG_INHERITED; /* XXX - only set, not used */ |
726f6388 JA |
161 | original_signals[i] = IMPOSSIBLE_TRAP_HANDLER; |
162 | } | |
163 | ||
164 | /* Show which signals are treated specially by the shell. */ | |
165 | #if defined (SIGCHLD) | |
0628567a | 166 | GETORIGSIG (SIGCHLD); |
726f6388 JA |
167 | sigmodes[SIGCHLD] |= (SIG_SPECIAL | SIG_NO_TRAP); |
168 | #endif /* SIGCHLD */ | |
169 | ||
0628567a | 170 | GETORIGSIG (SIGINT); |
726f6388 JA |
171 | sigmodes[SIGINT] |= SIG_SPECIAL; |
172 | ||
b72432fd JA |
173 | #if defined (__BEOS__) |
174 | /* BeOS sets SIGINT to SIG_IGN! */ | |
175 | original_signals[SIGINT] = SIG_DFL; | |
0628567a | 176 | sigmodes[SIGINT] &= ~SIG_HARD_IGNORE; |
b72432fd JA |
177 | #endif |
178 | ||
0628567a | 179 | GETORIGSIG (SIGQUIT); |
726f6388 JA |
180 | sigmodes[SIGQUIT] |= SIG_SPECIAL; |
181 | ||
182 | if (interactive) | |
183 | { | |
0628567a | 184 | GETORIGSIG (SIGTERM); |
726f6388 JA |
185 | sigmodes[SIGTERM] |= SIG_SPECIAL; |
186 | } | |
187 | } | |
188 | ||
ac50fbac | 189 | #ifdef DEBUG |
bb70624e JA |
190 | /* Return a printable representation of the trap handler for SIG. */ |
191 | static char * | |
192 | trap_handler_string (sig) | |
193 | int sig; | |
194 | { | |
195 | if (trap_list[sig] == (char *)DEFAULT_SIG) | |
196 | return "DEFAULT_SIG"; | |
197 | else if (trap_list[sig] == (char *)IGNORE_SIG) | |
198 | return "IGNORE_SIG"; | |
199 | else if (trap_list[sig] == (char *)IMPOSSIBLE_TRAP_HANDLER) | |
200 | return "IMPOSSIBLE_TRAP_HANDLER"; | |
201 | else if (trap_list[sig]) | |
202 | return trap_list[sig]; | |
203 | else | |
204 | return "NULL"; | |
205 | } | |
206 | #endif | |
207 | ||
726f6388 JA |
208 | /* Return the print name of this signal. */ |
209 | char * | |
210 | signal_name (sig) | |
211 | int sig; | |
212 | { | |
cce855bc JA |
213 | char *ret; |
214 | ||
215 | /* on cygwin32, signal_names[sig] could be null */ | |
b80f6443 JA |
216 | ret = (sig >= BASH_NSIG || sig < 0 || signal_names[sig] == NULL) |
217 | ? _("invalid signal number") | |
218 | : signal_names[sig]; | |
219 | ||
cce855bc | 220 | return ret; |
726f6388 JA |
221 | } |
222 | ||
223 | /* Turn a string into a signal number, or a number into | |
224 | a signal number. If STRING is "2", "SIGINT", or "INT", | |
225 | then (int)2 is returned. Return NO_SIG if STRING doesn't | |
226 | contain a valid signal descriptor. */ | |
227 | int | |
b80f6443 | 228 | decode_signal (string, flags) |
726f6388 | 229 | char *string; |
b80f6443 | 230 | int flags; |
726f6388 | 231 | { |
7117c2d2 | 232 | intmax_t sig; |
b80f6443 | 233 | char *name; |
726f6388 | 234 | |
ccc6cda3 | 235 | if (legal_number (string, &sig)) |
f73dda09 | 236 | return ((sig >= 0 && sig < NSIG) ? (int)sig : NO_SIG); |
726f6388 | 237 | |
e8ce775d | 238 | /* A leading `SIG' may be omitted. */ |
f73dda09 | 239 | for (sig = 0; sig < BASH_NSIG; sig++) |
b72432fd | 240 | { |
b80f6443 JA |
241 | name = signal_names[sig]; |
242 | if (name == 0 || name[0] == '\0') | |
b72432fd | 243 | continue; |
b80f6443 | 244 | |
ac50fbac | 245 | /* Check name without the SIG prefix first case sensitively or |
b80f6443 JA |
246 | insensitively depending on whether flags includes DSIG_NOCASE */ |
247 | if (STREQN (name, "SIG", 3)) | |
248 | { | |
249 | name += 3; | |
250 | ||
251 | if ((flags & DSIG_NOCASE) && strcasecmp (string, name) == 0) | |
252 | return ((int)sig); | |
253 | else if ((flags & DSIG_NOCASE) == 0 && strcmp (string, name) == 0) | |
254 | return ((int)sig); | |
255 | /* If we can't use the `SIG' prefix to match, punt on this | |
256 | name now. */ | |
257 | else if ((flags & DSIG_SIGPREFIX) == 0) | |
258 | continue; | |
259 | } | |
260 | ||
261 | /* Check name with SIG prefix case sensitively or insensitively | |
262 | depending on whether flags includes DSIG_NOCASE */ | |
263 | name = signal_names[sig]; | |
264 | if ((flags & DSIG_NOCASE) && strcasecmp (string, name) == 0) | |
265 | return ((int)sig); | |
266 | else if ((flags & DSIG_NOCASE) == 0 && strcmp (string, name) == 0) | |
b72432fd JA |
267 | return ((int)sig); |
268 | } | |
726f6388 JA |
269 | |
270 | return (NO_SIG); | |
271 | } | |
272 | ||
273 | /* Non-zero when we catch a trapped signal. */ | |
ccc6cda3 | 274 | static int catch_flag; |
726f6388 JA |
275 | |
276 | void | |
277 | run_pending_traps () | |
278 | { | |
279 | register int sig; | |
ac50fbac | 280 | int old_exit_value; |
0001803f | 281 | WORD_LIST *save_subst_varlist; |
ac50fbac | 282 | sh_parser_state_t pstate; |
495aee44 CR |
283 | #if defined (ARRAY_VARS) |
284 | ARRAY *ps; | |
285 | #endif | |
726f6388 JA |
286 | |
287 | if (catch_flag == 0) /* simple optimization */ | |
288 | return; | |
289 | ||
ac50fbac CR |
290 | if (running_trap > 0) |
291 | { | |
292 | #if defined (DEBUG) | |
293 | internal_warning ("run_pending_traps: recursive invocation while running trap for signal %d", running_trap-1); | |
294 | #endif | |
295 | #if 0 | |
296 | return; /* no recursive trap invocations */ | |
297 | #else | |
298 | ; | |
299 | #endif | |
300 | } | |
301 | ||
302 | catch_flag = trapped_signal_received = 0; | |
726f6388 JA |
303 | |
304 | /* Preserve $? when running trap. */ | |
305 | old_exit_value = last_command_exit_value; | |
495aee44 CR |
306 | #if defined (ARRAY_VARS) |
307 | ps = save_pipestatus_array (); | |
308 | #endif | |
726f6388 JA |
309 | |
310 | for (sig = 1; sig < NSIG; sig++) | |
311 | { | |
312 | /* XXX this could be made into a counter by using | |
28ef6c31 | 313 | while (pending_traps[sig]--) instead of the if statement. */ |
726f6388 JA |
314 | if (pending_traps[sig]) |
315 | { | |
ac50fbac CR |
316 | if (running_trap == sig+1) |
317 | /*continue*/; | |
726f6388 | 318 | |
ac50fbac | 319 | running_trap = sig + 1; |
726f6388 JA |
320 | |
321 | if (sig == SIGINT) | |
322 | { | |
ac50fbac | 323 | pending_traps[sig] = 0; /* XXX */ |
726f6388 | 324 | run_interrupt_trap (); |
ccc6cda3 | 325 | CLRINTERRUPT; |
726f6388 | 326 | } |
3185942a JA |
327 | #if defined (JOB_CONTROL) && defined (SIGCHLD) |
328 | else if (sig == SIGCHLD && | |
329 | trap_list[SIGCHLD] != (char *)IMPOSSIBLE_TRAP_HANDLER && | |
330 | (sigmodes[SIGCHLD] & SIG_INPROGRESS) == 0) | |
331 | { | |
ac50fbac | 332 | sigmodes[SIGCHLD] |= SIG_INPROGRESS; |
3185942a | 333 | run_sigchld_trap (pending_traps[sig]); /* use as counter */ |
ac50fbac CR |
334 | sigmodes[SIGCHLD] &= ~SIG_INPROGRESS; |
335 | } | |
336 | else if (sig == SIGCHLD && | |
337 | trap_list[SIGCHLD] == (char *)IMPOSSIBLE_TRAP_HANDLER && | |
338 | (sigmodes[SIGCHLD] & SIG_INPROGRESS) != 0) | |
339 | { | |
340 | /* This can happen when run_pending_traps is called while | |
341 | running a SIGCHLD trap handler. */ | |
342 | running_trap = 0; | |
343 | /* want to leave pending_traps[SIGCHLD] alone here */ | |
344 | continue; /* XXX */ | |
345 | } | |
346 | else if (sig == SIGCHLD && (sigmodes[SIGCHLD] & SIG_INPROGRESS)) | |
347 | { | |
348 | /* whoops -- print warning? */ | |
349 | running_trap = 0; /* XXX */ | |
350 | /* want to leave pending_traps[SIGCHLD] alone here */ | |
351 | continue; | |
3185942a JA |
352 | } |
353 | #endif | |
bb70624e JA |
354 | else if (trap_list[sig] == (char *)DEFAULT_SIG || |
355 | trap_list[sig] == (char *)IGNORE_SIG || | |
356 | trap_list[sig] == (char *)IMPOSSIBLE_TRAP_HANDLER) | |
357 | { | |
358 | /* This is possible due to a race condition. Say a bash | |
359 | process has SIGTERM trapped. A subshell is spawned | |
360 | using { list; } & and the parent does something and kills | |
361 | the subshell with SIGTERM. It's possible for the subshell | |
362 | to set pending_traps[SIGTERM] to 1 before the code in | |
363 | execute_cmd.c eventually calls restore_original_signals | |
364 | to reset the SIGTERM signal handler in the subshell. The | |
365 | next time run_pending_traps is called, pending_traps[SIGTERM] | |
366 | will be 1, but the trap handler in trap_list[SIGTERM] will | |
367 | be invalid (probably DEFAULT_SIG, but it could be IGNORE_SIG). | |
368 | Unless we catch this, the subshell will dump core when | |
369 | trap_list[SIGTERM] == DEFAULT_SIG, because DEFAULT_SIG is | |
370 | usually 0x0. */ | |
b80f6443 | 371 | internal_warning (_("run_pending_traps: bad value in trap_list[%d]: %p"), |
f73dda09 | 372 | sig, trap_list[sig]); |
bb70624e JA |
373 | if (trap_list[sig] == (char *)DEFAULT_SIG) |
374 | { | |
b80f6443 | 375 | internal_warning (_("run_pending_traps: signal handler is SIG_DFL, resending %d (%s) to myself"), sig, signal_name (sig)); |
bb70624e JA |
376 | kill (getpid (), sig); |
377 | } | |
378 | } | |
726f6388 | 379 | else |
bb70624e | 380 | { |
ac50fbac CR |
381 | /* XXX - should we use save_parser_state/restore_parser_state? */ |
382 | save_parser_state (&pstate); | |
0001803f CR |
383 | save_subst_varlist = subst_assign_varlist; |
384 | subst_assign_varlist = 0; | |
385 | ||
ac50fbac CR |
386 | #if defined (JOB_CONTROL) |
387 | save_pipeline (1); /* XXX only provides one save level */ | |
388 | #endif | |
389 | /* XXX - set pending_traps[sig] = 0 here? */ | |
390 | pending_traps[sig] = 0; | |
391 | evalstring (savestring (trap_list[sig]), "trap", SEVAL_NONINT|SEVAL_NOHIST|SEVAL_RESETLINE); | |
392 | #if defined (JOB_CONTROL) | |
393 | restore_pipeline (1); | |
394 | #endif | |
0001803f CR |
395 | |
396 | subst_assign_varlist = save_subst_varlist; | |
ac50fbac | 397 | restore_parser_state (&pstate); |
bb70624e | 398 | } |
726f6388 | 399 | |
ac50fbac CR |
400 | pending_traps[sig] = 0; /* XXX - move before evalstring? */ |
401 | running_trap = 0; | |
726f6388 JA |
402 | } |
403 | } | |
404 | ||
495aee44 CR |
405 | #if defined (ARRAY_VARS) |
406 | restore_pipestatus_array (ps); | |
407 | #endif | |
726f6388 JA |
408 | last_command_exit_value = old_exit_value; |
409 | } | |
410 | ||
411 | sighandler | |
412 | trap_handler (sig) | |
413 | int sig; | |
414 | { | |
bb70624e JA |
415 | int oerrno; |
416 | ||
3185942a JA |
417 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) |
418 | { | |
419 | #if defined (DEBUG) | |
420 | internal_warning ("trap_handler: signal %d: signal not trapped", sig); | |
421 | #endif | |
422 | SIGRETURN (0); | |
423 | } | |
424 | ||
726f6388 JA |
425 | if ((sig >= NSIG) || |
426 | (trap_list[sig] == (char *)DEFAULT_SIG) || | |
427 | (trap_list[sig] == (char *)IGNORE_SIG)) | |
b80f6443 | 428 | programming_error (_("trap_handler: bad signal %d"), sig); |
726f6388 JA |
429 | else |
430 | { | |
28ef6c31 | 431 | oerrno = errno; |
ccc6cda3 | 432 | #if defined (MUST_REINSTALL_SIGHANDLERS) |
3185942a JA |
433 | # if defined (JOB_CONTROL) && defined (SIGCHLD) |
434 | if (sig != SIGCHLD) | |
435 | # endif /* JOB_CONTROL && SIGCHLD */ | |
726f6388 | 436 | set_signal_handler (sig, trap_handler); |
ccc6cda3 | 437 | #endif /* MUST_REINSTALL_SIGHANDLERS */ |
726f6388 JA |
438 | |
439 | catch_flag = 1; | |
440 | pending_traps[sig]++; | |
441 | ||
ac50fbac CR |
442 | trapped_signal_received = sig; |
443 | ||
444 | if (this_shell_builtin && (this_shell_builtin == wait_builtin)) | |
7117c2d2 JA |
445 | { |
446 | wait_signal_received = sig; | |
ac50fbac CR |
447 | if (interrupt_immediately) |
448 | longjmp (wait_intr_buf, 1); | |
7117c2d2 JA |
449 | } |
450 | ||
ac50fbac CR |
451 | #if defined (READLINE) |
452 | /* Set the event hook so readline will call it after the signal handlers | |
453 | finish executing, so if this interrupted character input we can get | |
454 | quick response. */ | |
455 | if (RL_ISSTATE (RL_STATE_SIGHANDLER) && interrupt_immediately == 0) | |
456 | bashline_set_event_hook (); | |
457 | #endif | |
458 | ||
726f6388 JA |
459 | if (interrupt_immediately) |
460 | run_pending_traps (); | |
bb70624e JA |
461 | |
462 | errno = oerrno; | |
726f6388 | 463 | } |
ccc6cda3 JA |
464 | |
465 | SIGRETURN (0); | |
726f6388 JA |
466 | } |
467 | ||
ac50fbac CR |
468 | int |
469 | first_pending_trap () | |
470 | { | |
471 | register int i; | |
472 | ||
473 | for (i = 1; i < NSIG; i++) | |
474 | if (pending_traps[i]) | |
475 | return i; | |
476 | return -1; | |
477 | } | |
478 | ||
479 | int | |
480 | any_signals_trapped () | |
481 | { | |
482 | register int i; | |
483 | ||
484 | for (i = 1; i < NSIG; i++) | |
485 | if (sigmodes[i] & SIG_TRAPPED) | |
486 | return i; | |
487 | return -1; | |
488 | } | |
489 | ||
490 | void | |
491 | check_signals () | |
492 | { | |
493 | CHECK_ALRM; /* set by the read builtin */ | |
494 | QUIT; | |
495 | } | |
496 | ||
497 | /* Convenience functions the rest of the shell can use */ | |
498 | void | |
499 | check_signals_and_traps () | |
500 | { | |
501 | check_signals (); | |
502 | ||
503 | run_pending_traps (); | |
504 | } | |
505 | ||
726f6388 | 506 | #if defined (JOB_CONTROL) && defined (SIGCHLD) |
cce855bc JA |
507 | |
508 | #ifdef INCLUDE_UNUSED | |
726f6388 JA |
509 | /* Make COMMAND_STRING be executed when SIGCHLD is caught. */ |
510 | void | |
511 | set_sigchld_trap (command_string) | |
512 | char *command_string; | |
513 | { | |
726f6388 JA |
514 | set_signal (SIGCHLD, command_string); |
515 | } | |
cce855bc | 516 | #endif |
726f6388 | 517 | |
95732b49 | 518 | /* Make COMMAND_STRING be executed when SIGCHLD is caught iff SIGCHLD |
3185942a JA |
519 | is not already trapped. IMPOSSIBLE_TRAP_HANDLER is used as a sentinel |
520 | to make sure that a SIGCHLD trap handler run via run_sigchld_trap can | |
521 | reset the disposition to the default and not have the original signal | |
522 | accidentally restored, undoing the user's command. */ | |
726f6388 JA |
523 | void |
524 | maybe_set_sigchld_trap (command_string) | |
525 | char *command_string; | |
526 | { | |
3185942a | 527 | if ((sigmodes[SIGCHLD] & SIG_TRAPPED) == 0 && trap_list[SIGCHLD] == (char *)IMPOSSIBLE_TRAP_HANDLER) |
726f6388 JA |
528 | set_signal (SIGCHLD, command_string); |
529 | } | |
3185942a JA |
530 | |
531 | /* Temporarily set the SIGCHLD trap string to IMPOSSIBLE_TRAP_HANDLER. Used | |
532 | as a sentinel in run_sigchld_trap and maybe_set_sigchld_trap to see whether | |
533 | or not a SIGCHLD trap handler reset SIGCHLD disposition to the default. */ | |
534 | void | |
535 | set_impossible_sigchld_trap () | |
536 | { | |
537 | restore_default_signal (SIGCHLD); | |
538 | change_signal (SIGCHLD, (char *)IMPOSSIBLE_TRAP_HANDLER); | |
539 | sigmodes[SIGCHLD] &= ~SIG_TRAPPED; /* maybe_set_sigchld_trap checks this */ | |
540 | } | |
ac50fbac CR |
541 | |
542 | /* Act as if we received SIGCHLD NCHILD times and increment | |
543 | pending_traps[SIGCHLD] by that amount. This allows us to still run the | |
544 | SIGCHLD trap once for each exited child. */ | |
545 | void | |
546 | queue_sigchld_trap (nchild) | |
547 | int nchild; | |
548 | { | |
549 | if (nchild > 0) | |
550 | { | |
551 | catch_flag = 1; | |
552 | pending_traps[SIGCHLD] += nchild; | |
553 | trapped_signal_received = SIGCHLD; | |
554 | } | |
555 | } | |
726f6388 JA |
556 | #endif /* JOB_CONTROL && SIGCHLD */ |
557 | ||
ccc6cda3 JA |
558 | void |
559 | set_debug_trap (command) | |
726f6388 JA |
560 | char *command; |
561 | { | |
ccc6cda3 JA |
562 | set_signal (DEBUG_TRAP, command); |
563 | } | |
726f6388 | 564 | |
f73dda09 JA |
565 | void |
566 | set_error_trap (command) | |
567 | char *command; | |
568 | { | |
569 | set_signal (ERROR_TRAP, command); | |
570 | } | |
571 | ||
b80f6443 JA |
572 | void |
573 | set_return_trap (command) | |
574 | char *command; | |
575 | { | |
576 | set_signal (RETURN_TRAP, command); | |
577 | } | |
578 | ||
cce855bc | 579 | #ifdef INCLUDE_UNUSED |
ccc6cda3 JA |
580 | void |
581 | set_sigint_trap (command) | |
582 | char *command; | |
583 | { | |
726f6388 JA |
584 | set_signal (SIGINT, command); |
585 | } | |
cce855bc | 586 | #endif |
726f6388 JA |
587 | |
588 | /* Reset the SIGINT handler so that subshells that are doing `shellsy' | |
589 | things, like waiting for command substitution or executing commands | |
590 | in explicit subshells ( ( cmd ) ), can catch interrupts properly. */ | |
591 | SigHandler * | |
592 | set_sigint_handler () | |
593 | { | |
594 | if (sigmodes[SIGINT] & SIG_HARD_IGNORE) | |
595 | return ((SigHandler *)SIG_IGN); | |
596 | ||
597 | else if (sigmodes[SIGINT] & SIG_IGNORED) | |
ccc6cda3 JA |
598 | return ((SigHandler *)set_signal_handler (SIGINT, SIG_IGN)); /* XXX */ |
599 | ||
726f6388 JA |
600 | else if (sigmodes[SIGINT] & SIG_TRAPPED) |
601 | return ((SigHandler *)set_signal_handler (SIGINT, trap_handler)); | |
602 | ||
603 | /* The signal is not trapped, so set the handler to the shell's special | |
604 | interrupt handler. */ | |
605 | else if (interactive) /* XXX - was interactive_shell */ | |
606 | return (set_signal_handler (SIGINT, sigint_sighandler)); | |
607 | else | |
0628567a | 608 | return (set_signal_handler (SIGINT, termsig_sighandler)); |
726f6388 JA |
609 | } |
610 | ||
e8ce775d JA |
611 | /* Return the correct handler for signal SIG according to the values in |
612 | sigmodes[SIG]. */ | |
613 | SigHandler * | |
614 | trap_to_sighandler (sig) | |
615 | int sig; | |
616 | { | |
617 | if (sigmodes[sig] & (SIG_IGNORED|SIG_HARD_IGNORE)) | |
618 | return (SIG_IGN); | |
619 | else if (sigmodes[sig] & SIG_TRAPPED) | |
620 | return (trap_handler); | |
621 | else | |
622 | return (SIG_DFL); | |
623 | } | |
624 | ||
726f6388 JA |
625 | /* Set SIG to call STRING as a command. */ |
626 | void | |
627 | set_signal (sig, string) | |
628 | int sig; | |
629 | char *string; | |
630 | { | |
ac50fbac CR |
631 | sigset_t set, oset; |
632 | ||
f73dda09 | 633 | if (SPECIAL_TRAP (sig)) |
ccc6cda3 JA |
634 | { |
635 | change_signal (sig, savestring (string)); | |
d166f048 JA |
636 | if (sig == EXIT_TRAP && interactive == 0) |
637 | initialize_terminating_signals (); | |
ccc6cda3 JA |
638 | return; |
639 | } | |
640 | ||
726f6388 JA |
641 | /* A signal ignored on entry to the shell cannot be trapped or reset, but |
642 | no error is reported when attempting to do so. -- Posix.2 */ | |
643 | if (sigmodes[sig] & SIG_HARD_IGNORE) | |
644 | return; | |
645 | ||
646 | /* Make sure we have original_signals[sig] if the signal has not yet | |
647 | been trapped. */ | |
648 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) | |
649 | { | |
650 | /* If we aren't sure of the original value, check it. */ | |
651 | if (original_signals[sig] == IMPOSSIBLE_TRAP_HANDLER) | |
0628567a | 652 | GETORIGSIG (sig); |
726f6388 | 653 | if (original_signals[sig] == SIG_IGN) |
0628567a | 654 | return; |
726f6388 JA |
655 | } |
656 | ||
657 | /* Only change the system signal handler if SIG_NO_TRAP is not set. | |
658 | The trap command string is changed in either case. The shell signal | |
659 | handlers for SIGINT and SIGCHLD run the user specified traps in an | |
660 | environment in which it is safe to do so. */ | |
661 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) | |
662 | { | |
ac50fbac | 663 | BLOCK_SIGNAL (sig, set, oset); |
726f6388 JA |
664 | change_signal (sig, savestring (string)); |
665 | set_signal_handler (sig, trap_handler); | |
ac50fbac | 666 | UNBLOCK_SIGNAL (oset); |
726f6388 JA |
667 | } |
668 | else | |
669 | change_signal (sig, savestring (string)); | |
670 | } | |
671 | ||
672 | static void | |
673 | free_trap_command (sig) | |
674 | int sig; | |
675 | { | |
676 | if ((sigmodes[sig] & SIG_TRAPPED) && trap_list[sig] && | |
677 | (trap_list[sig] != (char *)IGNORE_SIG) && | |
678 | (trap_list[sig] != (char *)DEFAULT_SIG) && | |
679 | (trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER)) | |
680 | free (trap_list[sig]); | |
681 | } | |
ccc6cda3 | 682 | |
726f6388 JA |
683 | /* If SIG has a string assigned to it, get rid of it. Then give it |
684 | VALUE. */ | |
685 | static void | |
686 | change_signal (sig, value) | |
687 | int sig; | |
688 | char *value; | |
689 | { | |
d166f048 JA |
690 | if ((sigmodes[sig] & SIG_INPROGRESS) == 0) |
691 | free_trap_command (sig); | |
726f6388 JA |
692 | trap_list[sig] = value; |
693 | ||
694 | sigmodes[sig] |= SIG_TRAPPED; | |
695 | if (value == (char *)IGNORE_SIG) | |
696 | sigmodes[sig] |= SIG_IGNORED; | |
697 | else | |
698 | sigmodes[sig] &= ~SIG_IGNORED; | |
699 | if (sigmodes[sig] & SIG_INPROGRESS) | |
700 | sigmodes[sig] |= SIG_CHANGED; | |
701 | } | |
702 | ||
ac50fbac | 703 | void |
726f6388 JA |
704 | get_original_signal (sig) |
705 | int sig; | |
706 | { | |
707 | /* If we aren't sure the of the original value, then get it. */ | |
0001803f | 708 | if (sig > 0 && sig < NSIG && original_signals[sig] == (SigHandler *)IMPOSSIBLE_TRAP_HANDLER) |
0628567a | 709 | GETORIGSIG (sig); |
726f6388 JA |
710 | } |
711 | ||
495aee44 CR |
712 | void |
713 | get_all_original_signals () | |
714 | { | |
715 | register int i; | |
716 | ||
717 | for (i = 1; i < NSIG; i++) | |
718 | GET_ORIGINAL_SIGNAL (i); | |
719 | } | |
720 | ||
721 | void | |
722 | set_original_signal (sig, handler) | |
723 | int sig; | |
724 | SigHandler *handler; | |
725 | { | |
726 | if (sig > 0 && sig < NSIG && original_signals[sig] == (SigHandler *)IMPOSSIBLE_TRAP_HANDLER) | |
727 | SETORIGSIG (sig, handler); | |
728 | } | |
729 | ||
726f6388 JA |
730 | /* Restore the default action for SIG; i.e., the action the shell |
731 | would have taken before you used the trap command. This is called | |
732 | from trap_builtin (), which takes care to restore the handlers for | |
733 | the signals the shell treats specially. */ | |
734 | void | |
735 | restore_default_signal (sig) | |
736 | int sig; | |
737 | { | |
f73dda09 | 738 | if (SPECIAL_TRAP (sig)) |
726f6388 | 739 | { |
b80f6443 JA |
740 | if ((sig != DEBUG_TRAP && sig != ERROR_TRAP && sig != RETURN_TRAP) || |
741 | (sigmodes[sig] & SIG_INPROGRESS) == 0) | |
d166f048 | 742 | free_trap_command (sig); |
726f6388 JA |
743 | trap_list[sig] = (char *)NULL; |
744 | sigmodes[sig] &= ~SIG_TRAPPED; | |
d166f048 JA |
745 | if (sigmodes[sig] & SIG_INPROGRESS) |
746 | sigmodes[sig] |= SIG_CHANGED; | |
726f6388 JA |
747 | return; |
748 | } | |
749 | ||
750 | GET_ORIGINAL_SIGNAL (sig); | |
751 | ||
752 | /* A signal ignored on entry to the shell cannot be trapped or reset, but | |
753 | no error is reported when attempting to do so. Thanks Posix.2. */ | |
754 | if (sigmodes[sig] & SIG_HARD_IGNORE) | |
755 | return; | |
756 | ||
757 | /* If we aren't trapping this signal, don't bother doing anything else. */ | |
ac50fbac CR |
758 | /* We special-case SIGCHLD and IMPOSSIBLE_TRAP_HANDLER (see above) as a |
759 | sentinel to determine whether or not disposition is reset to the default | |
760 | while the trap handler is executing. */ | |
761 | if (((sigmodes[sig] & SIG_TRAPPED) == 0) && | |
762 | (sig != SIGCHLD || (sigmodes[sig] & SIG_INPROGRESS) == 0 || trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER)) | |
726f6388 JA |
763 | return; |
764 | ||
765 | /* Only change the signal handler for SIG if it allows it. */ | |
ccc6cda3 | 766 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) |
726f6388 JA |
767 | set_signal_handler (sig, original_signals[sig]); |
768 | ||
769 | /* Change the trap command in either case. */ | |
770 | change_signal (sig, (char *)DEFAULT_SIG); | |
771 | ||
772 | /* Mark the signal as no longer trapped. */ | |
773 | sigmodes[sig] &= ~SIG_TRAPPED; | |
774 | } | |
775 | ||
776 | /* Make this signal be ignored. */ | |
777 | void | |
778 | ignore_signal (sig) | |
779 | int sig; | |
780 | { | |
f73dda09 | 781 | if (SPECIAL_TRAP (sig) && ((sigmodes[sig] & SIG_IGNORED) == 0)) |
ccc6cda3 JA |
782 | { |
783 | change_signal (sig, (char *)IGNORE_SIG); | |
784 | return; | |
785 | } | |
786 | ||
726f6388 JA |
787 | GET_ORIGINAL_SIGNAL (sig); |
788 | ||
789 | /* A signal ignored on entry to the shell cannot be trapped or reset. | |
ccc6cda3 | 790 | No error is reported when the user attempts to do so. */ |
726f6388 JA |
791 | if (sigmodes[sig] & SIG_HARD_IGNORE) |
792 | return; | |
793 | ||
794 | /* If already trapped and ignored, no change necessary. */ | |
ccc6cda3 | 795 | if (sigmodes[sig] & SIG_IGNORED) |
726f6388 JA |
796 | return; |
797 | ||
798 | /* Only change the signal handler for SIG if it allows it. */ | |
ccc6cda3 | 799 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) |
726f6388 JA |
800 | set_signal_handler (sig, SIG_IGN); |
801 | ||
802 | /* Change the trap command in either case. */ | |
803 | change_signal (sig, (char *)IGNORE_SIG); | |
804 | } | |
805 | ||
806 | /* Handle the calling of "trap 0". The only sticky situation is when | |
807 | the command to be executed includes an "exit". This is why we have | |
808 | to provide our own place for top_level to jump to. */ | |
809 | int | |
810 | run_exit_trap () | |
811 | { | |
ccc6cda3 | 812 | char *trap_command; |
b80f6443 | 813 | int code, function_code, retval; |
495aee44 CR |
814 | #if defined (ARRAY_VARS) |
815 | ARRAY *ps; | |
816 | #endif | |
726f6388 | 817 | |
b80f6443 | 818 | trap_saved_exit_value = last_command_exit_value; |
495aee44 CR |
819 | #if defined (ARRAY_VARS) |
820 | ps = save_pipestatus_array (); | |
821 | #endif | |
b80f6443 | 822 | function_code = 0; |
726f6388 | 823 | |
ccc6cda3 JA |
824 | /* Run the trap only if signal 0 is trapped and not ignored, and we are not |
825 | currently running in the trap handler (call to exit in the list of | |
826 | commands given to trap 0). */ | |
827 | if ((sigmodes[EXIT_TRAP] & SIG_TRAPPED) && | |
828 | (sigmodes[EXIT_TRAP] & (SIG_IGNORED|SIG_INPROGRESS)) == 0) | |
726f6388 | 829 | { |
ccc6cda3 JA |
830 | trap_command = savestring (trap_list[EXIT_TRAP]); |
831 | sigmodes[EXIT_TRAP] &= ~SIG_TRAPPED; | |
832 | sigmodes[EXIT_TRAP] |= SIG_INPROGRESS; | |
726f6388 | 833 | |
b80f6443 JA |
834 | retval = trap_saved_exit_value; |
835 | running_trap = 1; | |
836 | ||
ac50fbac | 837 | code = setjmp_nosigs (top_level); |
726f6388 | 838 | |
b80f6443 JA |
839 | /* If we're in a function, make sure return longjmps come here, too. */ |
840 | if (return_catch_flag) | |
ac50fbac | 841 | function_code = setjmp_nosigs (return_catch); |
b80f6443 JA |
842 | |
843 | if (code == 0 && function_code == 0) | |
cce855bc JA |
844 | { |
845 | reset_parser (); | |
17345e5a | 846 | parse_and_execute (trap_command, "exit trap", SEVAL_NONINT|SEVAL_NOHIST|SEVAL_RESETLINE); |
cce855bc | 847 | } |
b80f6443 JA |
848 | else if (code == ERREXIT) |
849 | retval = last_command_exit_value; | |
726f6388 | 850 | else if (code == EXITPROG) |
b80f6443 JA |
851 | retval = last_command_exit_value; |
852 | else if (function_code != 0) | |
853 | retval = return_catch_value; | |
726f6388 | 854 | else |
b80f6443 JA |
855 | retval = trap_saved_exit_value; |
856 | ||
857 | running_trap = 0; | |
858 | return retval; | |
726f6388 JA |
859 | } |
860 | ||
495aee44 CR |
861 | #if defined (ARRAY_VARS) |
862 | restore_pipestatus_array (ps); | |
863 | #endif | |
b80f6443 | 864 | return (trap_saved_exit_value); |
726f6388 JA |
865 | } |
866 | ||
ccc6cda3 JA |
867 | void |
868 | run_trap_cleanup (sig) | |
869 | int sig; | |
870 | { | |
871 | sigmodes[sig] &= ~(SIG_INPROGRESS|SIG_CHANGED); | |
872 | } | |
873 | ||
ac50fbac CR |
874 | #define RECURSIVE_SIG(s) (SPECIAL_TRAP(s) == 0) |
875 | ||
ccc6cda3 | 876 | /* Run a trap command for SIG. SIG is one of the signals the shell treats |
b80f6443 JA |
877 | specially. Returns the exit status of the executed trap command list. */ |
878 | static int | |
ccc6cda3 | 879 | _run_trap_internal (sig, tag) |
726f6388 | 880 | int sig; |
ccc6cda3 | 881 | char *tag; |
726f6388 | 882 | { |
ccc6cda3 | 883 | char *trap_command, *old_trap; |
b80f6443 | 884 | int trap_exit_value, *token_state; |
ac50fbac CR |
885 | volatile int save_return_catch_flag, function_code; |
886 | int flags; | |
b80f6443 | 887 | procenv_t save_return_catch; |
0001803f | 888 | WORD_LIST *save_subst_varlist; |
ac50fbac | 889 | sh_parser_state_t pstate; |
495aee44 CR |
890 | #if defined (ARRAY_VARS) |
891 | ARRAY *ps; | |
892 | #endif | |
ccc6cda3 | 893 | |
b80f6443 | 894 | trap_exit_value = function_code = 0; |
ccc6cda3 JA |
895 | /* Run the trap only if SIG is trapped and not ignored, and we are not |
896 | currently executing in the trap handler. */ | |
897 | if ((sigmodes[sig] & SIG_TRAPPED) && ((sigmodes[sig] & SIG_IGNORED) == 0) && | |
898 | (trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER) && | |
ac50fbac CR |
899 | #if 0 |
900 | /* Uncomment this to allow some special signals to recursively execute | |
901 | trap handlers. */ | |
902 | (RECURSIVE_SIG (sig) || (sigmodes[sig] & SIG_INPROGRESS) == 0)) | |
903 | #else | |
ccc6cda3 | 904 | ((sigmodes[sig] & SIG_INPROGRESS) == 0)) |
ac50fbac | 905 | #endif |
ccc6cda3 JA |
906 | { |
907 | old_trap = trap_list[sig]; | |
908 | sigmodes[sig] |= SIG_INPROGRESS; | |
909 | sigmodes[sig] &= ~SIG_CHANGED; /* just to be sure */ | |
910 | trap_command = savestring (old_trap); | |
911 | ||
912 | running_trap = sig + 1; | |
ac50fbac | 913 | |
495aee44 CR |
914 | #if defined (ARRAY_VARS) |
915 | ps = save_pipestatus_array (); | |
916 | #endif | |
bb70624e | 917 | |
ac50fbac | 918 | save_parser_state (&pstate); |
0001803f CR |
919 | save_subst_varlist = subst_assign_varlist; |
920 | subst_assign_varlist = 0; | |
b80f6443 | 921 | |
ac50fbac | 922 | #if defined (JOB_CONTROL) |
7f89f4cd CR |
923 | if (sig != DEBUG_TRAP) /* run_debug_trap does this */ |
924 | save_pipeline (1); /* XXX only provides one save level */ | |
ac50fbac CR |
925 | #endif |
926 | ||
b80f6443 JA |
927 | /* If we're in a function, make sure return longjmps come here, too. */ |
928 | save_return_catch_flag = return_catch_flag; | |
929 | if (return_catch_flag) | |
930 | { | |
931 | COPY_PROCENV (return_catch, save_return_catch); | |
ac50fbac | 932 | function_code = setjmp_nosigs (return_catch); |
b80f6443 JA |
933 | } |
934 | ||
17345e5a | 935 | flags = SEVAL_NONINT|SEVAL_NOHIST; |
89a92869 | 936 | if (sig != DEBUG_TRAP && sig != RETURN_TRAP && sig != ERROR_TRAP) |
17345e5a | 937 | flags |= SEVAL_RESETLINE; |
b80f6443 | 938 | if (function_code == 0) |
17345e5a | 939 | parse_and_execute (trap_command, tag, flags); |
b80f6443 | 940 | |
ac50fbac CR |
941 | trap_exit_value = last_command_exit_value; |
942 | ||
943 | #if defined (JOB_CONTROL) | |
7f89f4cd CR |
944 | if (sig != DEBUG_TRAP) /* run_debug_trap does this */ |
945 | restore_pipeline (1); | |
ac50fbac | 946 | #endif |
bb70624e | 947 | |
0001803f | 948 | subst_assign_varlist = save_subst_varlist; |
ac50fbac | 949 | restore_parser_state (&pstate); |
0001803f | 950 | |
495aee44 CR |
951 | #if defined (ARRAY_VARS) |
952 | restore_pipestatus_array (ps); | |
953 | #endif | |
ccc6cda3 JA |
954 | running_trap = 0; |
955 | ||
956 | sigmodes[sig] &= ~SIG_INPROGRESS; | |
957 | ||
958 | if (sigmodes[sig] & SIG_CHANGED) | |
959 | { | |
b80f6443 JA |
960 | #if 0 |
961 | /* Special traps like EXIT, DEBUG, RETURN are handled explicitly in | |
962 | the places where they can be changed using unwind-protects. For | |
963 | example, look at execute_cmd.c:execute_function(). */ | |
964 | if (SPECIAL_TRAP (sig) == 0) | |
965 | #endif | |
966 | free (old_trap); | |
ccc6cda3 JA |
967 | sigmodes[sig] &= ~SIG_CHANGED; |
968 | } | |
b80f6443 JA |
969 | |
970 | if (save_return_catch_flag) | |
971 | { | |
972 | return_catch_flag = save_return_catch_flag; | |
973 | return_catch_value = trap_exit_value; | |
974 | COPY_PROCENV (save_return_catch, return_catch); | |
975 | if (function_code) | |
976 | longjmp (return_catch, 1); | |
977 | } | |
ccc6cda3 | 978 | } |
b80f6443 JA |
979 | |
980 | return trap_exit_value; | |
ccc6cda3 JA |
981 | } |
982 | ||
b80f6443 | 983 | int |
ccc6cda3 JA |
984 | run_debug_trap () |
985 | { | |
b80f6443 | 986 | int trap_exit_value; |
89a92869 CR |
987 | pid_t save_pgrp; |
988 | int save_pipe[2]; | |
b80f6443 JA |
989 | |
990 | /* XXX - question: should the DEBUG trap inherit the RETURN trap? */ | |
991 | trap_exit_value = 0; | |
992 | if ((sigmodes[DEBUG_TRAP] & SIG_TRAPPED) && ((sigmodes[DEBUG_TRAP] & SIG_IGNORED) == 0) && ((sigmodes[DEBUG_TRAP] & SIG_INPROGRESS) == 0)) | |
993 | { | |
89a92869 CR |
994 | #if defined (JOB_CONTROL) |
995 | save_pgrp = pipeline_pgrp; | |
996 | pipeline_pgrp = 0; | |
997 | save_pipeline (1); | |
998 | # if defined (PGRP_PIPE) | |
999 | save_pgrp_pipe (save_pipe, 1); | |
1000 | # endif | |
1001 | stop_making_children (); | |
1002 | #endif | |
1003 | ||
b80f6443 | 1004 | trap_exit_value = _run_trap_internal (DEBUG_TRAP, "debug trap"); |
89a92869 CR |
1005 | |
1006 | #if defined (JOB_CONTROL) | |
1007 | pipeline_pgrp = save_pgrp; | |
1008 | restore_pipeline (1); | |
1009 | # if defined (PGRP_PIPE) | |
1010 | close_pgrp_pipe (); | |
1011 | restore_pgrp_pipe (save_pipe); | |
1012 | # endif | |
1013 | if (pipeline_pgrp > 0) | |
1014 | give_terminal_to (pipeline_pgrp, 1); | |
1015 | notify_and_cleanup (); | |
1016 | #endif | |
b80f6443 JA |
1017 | |
1018 | #if defined (DEBUGGER) | |
1019 | /* If we're in the debugger and the DEBUG trap returns 2 while we're in | |
1020 | a function or sourced script, we force a `return'. */ | |
1021 | if (debugging_mode && trap_exit_value == 2 && return_catch_flag) | |
1022 | { | |
1023 | return_catch_value = trap_exit_value; | |
1024 | longjmp (return_catch, 1); | |
1025 | } | |
1026 | #endif | |
1027 | } | |
1028 | return trap_exit_value; | |
ccc6cda3 JA |
1029 | } |
1030 | ||
f73dda09 JA |
1031 | void |
1032 | run_error_trap () | |
1033 | { | |
b80f6443 | 1034 | if ((sigmodes[ERROR_TRAP] & SIG_TRAPPED) && ((sigmodes[ERROR_TRAP] & SIG_IGNORED) == 0) && (sigmodes[ERROR_TRAP] & SIG_INPROGRESS) == 0) |
f73dda09 JA |
1035 | _run_trap_internal (ERROR_TRAP, "error trap"); |
1036 | } | |
1037 | ||
b80f6443 JA |
1038 | void |
1039 | run_return_trap () | |
1040 | { | |
1041 | int old_exit_value; | |
1042 | ||
95732b49 JA |
1043 | #if 0 |
1044 | if ((sigmodes[DEBUG_TRAP] & SIG_TRAPPED) && (sigmodes[DEBUG_TRAP] & SIG_INPROGRESS)) | |
1045 | return; | |
1046 | #endif | |
1047 | ||
b80f6443 JA |
1048 | if ((sigmodes[RETURN_TRAP] & SIG_TRAPPED) && ((sigmodes[RETURN_TRAP] & SIG_IGNORED) == 0) && (sigmodes[RETURN_TRAP] & SIG_INPROGRESS) == 0) |
1049 | { | |
1050 | old_exit_value = last_command_exit_value; | |
1051 | _run_trap_internal (RETURN_TRAP, "return trap"); | |
1052 | last_command_exit_value = old_exit_value; | |
1053 | } | |
1054 | } | |
1055 | ||
ccc6cda3 JA |
1056 | /* Run a trap set on SIGINT. This is called from throw_to_top_level (), and |
1057 | declared here to localize the trap functions. */ | |
1058 | void | |
1059 | run_interrupt_trap () | |
1060 | { | |
1061 | _run_trap_internal (SIGINT, "interrupt trap"); | |
726f6388 JA |
1062 | } |
1063 | ||
1064 | /* Free all the allocated strings in the list of traps and reset the trap | |
0001803f CR |
1065 | values to the default. Intended to be called from subshells that want |
1066 | to complete work done by reset_signal_handlers upon execution of a | |
ac50fbac CR |
1067 | subsequent `trap' command that changes a signal's disposition. We need |
1068 | to make sure that we duplicate the behavior of | |
1069 | reset_or_restore_signal_handlers and not change the disposition of signals | |
1070 | that are set to be ignored. */ | |
726f6388 JA |
1071 | void |
1072 | free_trap_strings () | |
1073 | { | |
1074 | register int i; | |
1075 | ||
f73dda09 | 1076 | for (i = 0; i < BASH_NSIG; i++) |
ac50fbac CR |
1077 | { |
1078 | if (trap_list[i] != (char *)IGNORE_SIG) | |
1079 | free_trap_string (i); | |
1080 | } | |
b80f6443 | 1081 | trap_list[DEBUG_TRAP] = trap_list[EXIT_TRAP] = trap_list[ERROR_TRAP] = trap_list[RETURN_TRAP] = (char *)NULL; |
726f6388 | 1082 | } |
0001803f CR |
1083 | |
1084 | /* Free a trap command string associated with SIG without changing signal | |
1085 | disposition. Intended to be called from free_trap_strings() */ | |
1086 | static void | |
1087 | free_trap_string (sig) | |
1088 | int sig; | |
1089 | { | |
1090 | change_signal (sig, (char *)DEFAULT_SIG); | |
1091 | sigmodes[sig] &= ~SIG_TRAPPED; | |
1092 | } | |
726f6388 | 1093 | |
495aee44 CR |
1094 | /* Reset the handler for SIG to the original value but leave the trap string |
1095 | in place. */ | |
726f6388 JA |
1096 | static void |
1097 | reset_signal (sig) | |
1098 | int sig; | |
1099 | { | |
1100 | set_signal_handler (sig, original_signals[sig]); | |
7117c2d2 | 1101 | sigmodes[sig] &= ~SIG_TRAPPED; |
726f6388 JA |
1102 | } |
1103 | ||
ccc6cda3 JA |
1104 | /* Set the handler signal SIG to the original and free any trap |
1105 | command associated with it. */ | |
1106 | static void | |
1107 | restore_signal (sig) | |
1108 | int sig; | |
726f6388 | 1109 | { |
ccc6cda3 JA |
1110 | set_signal_handler (sig, original_signals[sig]); |
1111 | change_signal (sig, (char *)DEFAULT_SIG); | |
1112 | sigmodes[sig] &= ~SIG_TRAPPED; | |
726f6388 JA |
1113 | } |
1114 | ||
ccc6cda3 JA |
1115 | static void |
1116 | reset_or_restore_signal_handlers (reset) | |
f73dda09 | 1117 | sh_resetsig_func_t *reset; |
726f6388 JA |
1118 | { |
1119 | register int i; | |
1120 | ||
ccc6cda3 JA |
1121 | /* Take care of the exit trap first */ |
1122 | if (sigmodes[EXIT_TRAP] & SIG_TRAPPED) | |
726f6388 | 1123 | { |
ccc6cda3 | 1124 | sigmodes[EXIT_TRAP] &= ~SIG_TRAPPED; |
95732b49 JA |
1125 | if (reset != reset_signal) |
1126 | { | |
1127 | free_trap_command (EXIT_TRAP); | |
1128 | trap_list[EXIT_TRAP] = (char *)NULL; | |
1129 | } | |
726f6388 | 1130 | } |
b80f6443 | 1131 | |
726f6388 JA |
1132 | for (i = 1; i < NSIG; i++) |
1133 | { | |
ccc6cda3 | 1134 | if (sigmodes[i] & SIG_TRAPPED) |
726f6388 JA |
1135 | { |
1136 | if (trap_list[i] == (char *)IGNORE_SIG) | |
1137 | set_signal_handler (i, SIG_IGN); | |
1138 | else | |
ccc6cda3 | 1139 | (*reset) (i); |
726f6388 | 1140 | } |
ccc6cda3 JA |
1141 | else if (sigmodes[i] & SIG_SPECIAL) |
1142 | (*reset) (i); | |
726f6388 | 1143 | } |
f73dda09 JA |
1144 | |
1145 | /* Command substitution and other child processes don't inherit the | |
b80f6443 JA |
1146 | debug, error, or return traps. If we're in the debugger, and the |
1147 | `functrace' or `errtrace' options have been set, then let command | |
1148 | substitutions inherit them. Let command substitution inherit the | |
1149 | RETURN trap if we're in the debugger and tracing functions. */ | |
0628567a JA |
1150 | if (function_trace_mode == 0) |
1151 | { | |
1152 | sigmodes[DEBUG_TRAP] &= ~SIG_TRAPPED; | |
1153 | sigmodes[RETURN_TRAP] &= ~SIG_TRAPPED; | |
1154 | } | |
1155 | if (error_trace_mode == 0) | |
b80f6443 | 1156 | sigmodes[ERROR_TRAP] &= ~SIG_TRAPPED; |
726f6388 JA |
1157 | } |
1158 | ||
f73dda09 | 1159 | /* Reset trapped signals to their original values, but don't free the |
495aee44 CR |
1160 | trap strings. Called by the command substitution code and other places |
1161 | that create a "subshell environment". */ | |
726f6388 | 1162 | void |
ccc6cda3 | 1163 | reset_signal_handlers () |
726f6388 | 1164 | { |
ccc6cda3 JA |
1165 | reset_or_restore_signal_handlers (reset_signal); |
1166 | } | |
726f6388 | 1167 | |
ccc6cda3 JA |
1168 | /* Reset all trapped signals to their original values. Signals set to be |
1169 | ignored with trap '' SIGNAL should be ignored, so we make sure that they | |
1170 | are. Called by child processes after they are forked. */ | |
1171 | void | |
1172 | restore_original_signals () | |
1173 | { | |
1174 | reset_or_restore_signal_handlers (restore_signal); | |
726f6388 JA |
1175 | } |
1176 | ||
1177 | /* If a trap handler exists for signal SIG, then call it; otherwise just | |
ac50fbac | 1178 | return failure. Returns 1 if it called the trap handler. */ |
726f6388 JA |
1179 | int |
1180 | maybe_call_trap_handler (sig) | |
1181 | int sig; | |
1182 | { | |
1183 | /* Call the trap handler for SIG if the signal is trapped and not ignored. */ | |
ccc6cda3 | 1184 | if ((sigmodes[sig] & SIG_TRAPPED) && ((sigmodes[sig] & SIG_IGNORED) == 0)) |
726f6388 JA |
1185 | { |
1186 | switch (sig) | |
1187 | { | |
1188 | case SIGINT: | |
1189 | run_interrupt_trap (); | |
1190 | break; | |
ccc6cda3 | 1191 | case EXIT_TRAP: |
726f6388 JA |
1192 | run_exit_trap (); |
1193 | break; | |
ccc6cda3 JA |
1194 | case DEBUG_TRAP: |
1195 | run_debug_trap (); | |
1196 | break; | |
f73dda09 JA |
1197 | case ERROR_TRAP: |
1198 | run_error_trap (); | |
1199 | break; | |
726f6388 JA |
1200 | default: |
1201 | trap_handler (sig); | |
1202 | break; | |
1203 | } | |
1204 | return (1); | |
1205 | } | |
1206 | else | |
1207 | return (0); | |
1208 | } | |
1209 | ||
1210 | int | |
1211 | signal_is_trapped (sig) | |
1212 | int sig; | |
1213 | { | |
1214 | return (sigmodes[sig] & SIG_TRAPPED); | |
1215 | } | |
1216 | ||
ac50fbac CR |
1217 | int |
1218 | signal_is_pending (sig) | |
1219 | int sig; | |
1220 | { | |
1221 | return (pending_traps[sig]); | |
1222 | } | |
1223 | ||
726f6388 JA |
1224 | int |
1225 | signal_is_special (sig) | |
1226 | int sig; | |
1227 | { | |
1228 | return (sigmodes[sig] & SIG_SPECIAL); | |
1229 | } | |
1230 | ||
1231 | int | |
1232 | signal_is_ignored (sig) | |
1233 | int sig; | |
1234 | { | |
1235 | return (sigmodes[sig] & SIG_IGNORED); | |
1236 | } | |
1237 | ||
495aee44 CR |
1238 | int |
1239 | signal_is_hard_ignored (sig) | |
1240 | int sig; | |
1241 | { | |
1242 | return (sigmodes[sig] & SIG_HARD_IGNORE); | |
1243 | } | |
1244 | ||
726f6388 | 1245 | void |
ac50fbac | 1246 | set_signal_hard_ignored (sig) |
726f6388 JA |
1247 | int sig; |
1248 | { | |
1249 | sigmodes[sig] |= SIG_HARD_IGNORE; | |
ccc6cda3 | 1250 | original_signals[sig] = SIG_IGN; |
726f6388 | 1251 | } |
95732b49 | 1252 | |
ac50fbac CR |
1253 | void |
1254 | set_signal_ignored (sig) | |
1255 | int sig; | |
1256 | { | |
1257 | original_signals[sig] = SIG_IGN; | |
1258 | } | |
1259 | ||
95732b49 JA |
1260 | int |
1261 | signal_in_progress (sig) | |
1262 | int sig; | |
1263 | { | |
1264 | return (sigmodes[sig] & SIG_INPROGRESS); | |
1265 | } |