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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 | ||
495aee44 | 4 | /* Copyright (C) 1987-2010 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 | ||
cce855bc JA |
36 | #include "trap.h" |
37 | ||
726f6388 | 38 | #include "shell.h" |
b80f6443 | 39 | #include "flags.h" |
bb70624e | 40 | #include "input.h" /* for save_token_state, restore_token_state */ |
3185942a | 41 | #include "jobs.h" |
726f6388 | 42 | #include "signames.h" |
7117c2d2 | 43 | #include "builtins.h" |
ccc6cda3 | 44 | #include "builtins/common.h" |
7117c2d2 | 45 | #include "builtins/builtext.h" |
726f6388 | 46 | |
bb70624e JA |
47 | #ifndef errno |
48 | extern int errno; | |
49 | #endif | |
50 | ||
726f6388 JA |
51 | /* Flags which describe the current handling state of a signal. */ |
52 | #define SIG_INHERITED 0x0 /* Value inherited from parent. */ | |
53 | #define SIG_TRAPPED 0x1 /* Currently trapped. */ | |
54 | #define SIG_HARD_IGNORE 0x2 /* Signal was ignored on shell entry. */ | |
55 | #define SIG_SPECIAL 0x4 /* Treat this signal specially. */ | |
56 | #define SIG_NO_TRAP 0x8 /* Signal cannot be trapped. */ | |
ccc6cda3 JA |
57 | #define SIG_INPROGRESS 0x10 /* Signal handler currently executing. */ |
58 | #define SIG_CHANGED 0x20 /* Trap value changed in trap handler. */ | |
59 | #define SIG_IGNORED 0x40 /* The signal is currently being ignored. */ | |
726f6388 | 60 | |
b80f6443 | 61 | #define SPECIAL_TRAP(s) ((s) == EXIT_TRAP || (s) == DEBUG_TRAP || (s) == ERROR_TRAP || (s) == RETURN_TRAP) |
f73dda09 | 62 | |
726f6388 | 63 | /* An array of such flags, one for each signal, describing what the |
ccc6cda3 JA |
64 | shell will do with a signal. DEBUG_TRAP == NSIG; some code below |
65 | assumes this. */ | |
f73dda09 JA |
66 | static int sigmodes[BASH_NSIG]; |
67 | ||
68 | static void free_trap_command __P((int)); | |
69 | static void change_signal __P((int, char *)); | |
70 | ||
71 | static void get_original_signal __P((int)); | |
72 | ||
b80f6443 | 73 | static int _run_trap_internal __P((int, char *)); |
726f6388 | 74 | |
0001803f | 75 | static void free_trap_string __P((int)); |
f73dda09 JA |
76 | static void reset_signal __P((int)); |
77 | static void restore_signal __P((int)); | |
78 | static void reset_or_restore_signal_handlers __P((sh_resetsig_func_t *)); | |
726f6388 JA |
79 | |
80 | /* Variables used here but defined in other files. */ | |
726f6388 | 81 | extern int last_command_exit_value; |
d166f048 | 82 | extern int line_number; |
726f6388 | 83 | |
b80f6443 | 84 | extern char *this_command_name; |
7117c2d2 JA |
85 | extern sh_builtin_func_t *this_shell_builtin; |
86 | extern procenv_t wait_intr_buf; | |
b80f6443 JA |
87 | extern int return_catch_flag, return_catch_value; |
88 | extern int subshell_level; | |
0001803f | 89 | extern WORD_LIST *subst_assign_varlist; |
7117c2d2 | 90 | |
726f6388 JA |
91 | /* The list of things to do originally, before we started trapping. */ |
92 | SigHandler *original_signals[NSIG]; | |
93 | ||
94 | /* For each signal, a slot for a string, which is a command to be | |
95 | executed when that signal is recieved. The slot can also contain | |
96 | DEFAULT_SIG, which means do whatever you were going to do before | |
97 | you were so rudely interrupted, or IGNORE_SIG, which says ignore | |
98 | this signal. */ | |
f73dda09 | 99 | char *trap_list[BASH_NSIG]; |
726f6388 JA |
100 | |
101 | /* A bitmap of signals received for which we have trap handlers. */ | |
102 | int pending_traps[NSIG]; | |
103 | ||
ccc6cda3 JA |
104 | /* Set to the number of the signal we're running the trap for + 1. |
105 | Used in execute_cmd.c and builtins/common.c to clean up when | |
106 | parse_and_execute does not return normally after executing the | |
107 | trap command (e.g., when `return' is executed in the trap command). */ | |
108 | int running_trap; | |
109 | ||
b80f6443 JA |
110 | /* Set to last_command_exit_value before running a trap. */ |
111 | int trap_saved_exit_value; | |
d166f048 | 112 | |
7117c2d2 JA |
113 | /* The (trapped) signal received while executing in the `wait' builtin */ |
114 | int wait_signal_received; | |
115 | ||
0628567a JA |
116 | #define GETORIGSIG(sig) \ |
117 | do { \ | |
118 | original_signals[sig] = (SigHandler *)set_signal_handler (sig, SIG_DFL); \ | |
119 | set_signal_handler (sig, original_signals[sig]); \ | |
120 | if (original_signals[sig] == SIG_IGN) \ | |
121 | sigmodes[sig] |= SIG_HARD_IGNORE; \ | |
122 | } while (0) | |
123 | ||
495aee44 CR |
124 | #define SETORIGSIG(sig,handler) \ |
125 | do { \ | |
126 | original_signals[sig] = handler; \ | |
127 | if (original_signals[sig] == SIG_IGN) \ | |
128 | sigmodes[sig] |= SIG_HARD_IGNORE; \ | |
129 | } while (0) | |
130 | ||
0628567a JA |
131 | #define GET_ORIGINAL_SIGNAL(sig) \ |
132 | if (sig && sig < NSIG && original_signals[sig] == IMPOSSIBLE_TRAP_HANDLER) \ | |
133 | GETORIGSIG(sig) | |
134 | ||
726f6388 JA |
135 | void |
136 | initialize_traps () | |
137 | { | |
138 | register int i; | |
139 | ||
0628567a JA |
140 | initialize_signames(); |
141 | ||
b80f6443 JA |
142 | trap_list[EXIT_TRAP] = trap_list[DEBUG_TRAP] = trap_list[ERROR_TRAP] = trap_list[RETURN_TRAP] = (char *)NULL; |
143 | sigmodes[EXIT_TRAP] = sigmodes[DEBUG_TRAP] = sigmodes[ERROR_TRAP] = sigmodes[RETURN_TRAP] = SIG_INHERITED; | |
ccc6cda3 | 144 | original_signals[EXIT_TRAP] = IMPOSSIBLE_TRAP_HANDLER; |
726f6388 JA |
145 | |
146 | for (i = 1; i < NSIG; i++) | |
147 | { | |
148 | pending_traps[i] = 0; | |
149 | trap_list[i] = (char *)DEFAULT_SIG; | |
495aee44 | 150 | sigmodes[i] = SIG_INHERITED; /* XXX - only set, not used */ |
726f6388 JA |
151 | original_signals[i] = IMPOSSIBLE_TRAP_HANDLER; |
152 | } | |
153 | ||
154 | /* Show which signals are treated specially by the shell. */ | |
155 | #if defined (SIGCHLD) | |
0628567a | 156 | GETORIGSIG (SIGCHLD); |
726f6388 JA |
157 | sigmodes[SIGCHLD] |= (SIG_SPECIAL | SIG_NO_TRAP); |
158 | #endif /* SIGCHLD */ | |
159 | ||
0628567a | 160 | GETORIGSIG (SIGINT); |
726f6388 JA |
161 | sigmodes[SIGINT] |= SIG_SPECIAL; |
162 | ||
b72432fd JA |
163 | #if defined (__BEOS__) |
164 | /* BeOS sets SIGINT to SIG_IGN! */ | |
165 | original_signals[SIGINT] = SIG_DFL; | |
0628567a | 166 | sigmodes[SIGINT] &= ~SIG_HARD_IGNORE; |
b72432fd JA |
167 | #endif |
168 | ||
0628567a | 169 | GETORIGSIG (SIGQUIT); |
726f6388 JA |
170 | sigmodes[SIGQUIT] |= SIG_SPECIAL; |
171 | ||
172 | if (interactive) | |
173 | { | |
0628567a | 174 | GETORIGSIG (SIGTERM); |
726f6388 JA |
175 | sigmodes[SIGTERM] |= SIG_SPECIAL; |
176 | } | |
177 | } | |
178 | ||
bb70624e JA |
179 | #ifdef INCLUDE_UNUSED |
180 | /* Return a printable representation of the trap handler for SIG. */ | |
181 | static char * | |
182 | trap_handler_string (sig) | |
183 | int sig; | |
184 | { | |
185 | if (trap_list[sig] == (char *)DEFAULT_SIG) | |
186 | return "DEFAULT_SIG"; | |
187 | else if (trap_list[sig] == (char *)IGNORE_SIG) | |
188 | return "IGNORE_SIG"; | |
189 | else if (trap_list[sig] == (char *)IMPOSSIBLE_TRAP_HANDLER) | |
190 | return "IMPOSSIBLE_TRAP_HANDLER"; | |
191 | else if (trap_list[sig]) | |
192 | return trap_list[sig]; | |
193 | else | |
194 | return "NULL"; | |
195 | } | |
196 | #endif | |
197 | ||
726f6388 JA |
198 | /* Return the print name of this signal. */ |
199 | char * | |
200 | signal_name (sig) | |
201 | int sig; | |
202 | { | |
cce855bc JA |
203 | char *ret; |
204 | ||
205 | /* on cygwin32, signal_names[sig] could be null */ | |
b80f6443 JA |
206 | ret = (sig >= BASH_NSIG || sig < 0 || signal_names[sig] == NULL) |
207 | ? _("invalid signal number") | |
208 | : signal_names[sig]; | |
209 | ||
cce855bc | 210 | return ret; |
726f6388 JA |
211 | } |
212 | ||
213 | /* Turn a string into a signal number, or a number into | |
214 | a signal number. If STRING is "2", "SIGINT", or "INT", | |
215 | then (int)2 is returned. Return NO_SIG if STRING doesn't | |
216 | contain a valid signal descriptor. */ | |
217 | int | |
b80f6443 | 218 | decode_signal (string, flags) |
726f6388 | 219 | char *string; |
b80f6443 | 220 | int flags; |
726f6388 | 221 | { |
7117c2d2 | 222 | intmax_t sig; |
b80f6443 | 223 | char *name; |
726f6388 | 224 | |
ccc6cda3 | 225 | if (legal_number (string, &sig)) |
f73dda09 | 226 | return ((sig >= 0 && sig < NSIG) ? (int)sig : NO_SIG); |
726f6388 | 227 | |
e8ce775d | 228 | /* A leading `SIG' may be omitted. */ |
f73dda09 | 229 | for (sig = 0; sig < BASH_NSIG; sig++) |
b72432fd | 230 | { |
b80f6443 JA |
231 | name = signal_names[sig]; |
232 | if (name == 0 || name[0] == '\0') | |
b72432fd | 233 | continue; |
b80f6443 JA |
234 | |
235 | /* Check name without the SIG prefix first case sensitivly or | |
236 | insensitively depending on whether flags includes DSIG_NOCASE */ | |
237 | if (STREQN (name, "SIG", 3)) | |
238 | { | |
239 | name += 3; | |
240 | ||
241 | if ((flags & DSIG_NOCASE) && strcasecmp (string, name) == 0) | |
242 | return ((int)sig); | |
243 | else if ((flags & DSIG_NOCASE) == 0 && strcmp (string, name) == 0) | |
244 | return ((int)sig); | |
245 | /* If we can't use the `SIG' prefix to match, punt on this | |
246 | name now. */ | |
247 | else if ((flags & DSIG_SIGPREFIX) == 0) | |
248 | continue; | |
249 | } | |
250 | ||
251 | /* Check name with SIG prefix case sensitively or insensitively | |
252 | depending on whether flags includes DSIG_NOCASE */ | |
253 | name = signal_names[sig]; | |
254 | if ((flags & DSIG_NOCASE) && strcasecmp (string, name) == 0) | |
255 | return ((int)sig); | |
256 | else if ((flags & DSIG_NOCASE) == 0 && strcmp (string, name) == 0) | |
b72432fd JA |
257 | return ((int)sig); |
258 | } | |
726f6388 JA |
259 | |
260 | return (NO_SIG); | |
261 | } | |
262 | ||
263 | /* Non-zero when we catch a trapped signal. */ | |
ccc6cda3 | 264 | static int catch_flag; |
726f6388 JA |
265 | |
266 | void | |
267 | run_pending_traps () | |
268 | { | |
269 | register int sig; | |
bb70624e | 270 | int old_exit_value, *token_state; |
0001803f | 271 | WORD_LIST *save_subst_varlist; |
495aee44 CR |
272 | #if defined (ARRAY_VARS) |
273 | ARRAY *ps; | |
274 | #endif | |
726f6388 JA |
275 | |
276 | if (catch_flag == 0) /* simple optimization */ | |
277 | return; | |
278 | ||
279 | catch_flag = 0; | |
280 | ||
281 | /* Preserve $? when running trap. */ | |
282 | old_exit_value = last_command_exit_value; | |
495aee44 CR |
283 | #if defined (ARRAY_VARS) |
284 | ps = save_pipestatus_array (); | |
285 | #endif | |
726f6388 JA |
286 | |
287 | for (sig = 1; sig < NSIG; sig++) | |
288 | { | |
289 | /* XXX this could be made into a counter by using | |
28ef6c31 | 290 | while (pending_traps[sig]--) instead of the if statement. */ |
726f6388 JA |
291 | if (pending_traps[sig]) |
292 | { | |
ccc6cda3 | 293 | #if defined (HAVE_POSIX_SIGNALS) |
726f6388 JA |
294 | sigset_t set, oset; |
295 | ||
296 | sigemptyset (&set); | |
297 | sigemptyset (&oset); | |
298 | ||
299 | sigaddset (&set, sig); | |
300 | sigprocmask (SIG_BLOCK, &set, &oset); | |
301 | #else | |
302 | # if defined (HAVE_BSD_SIGNALS) | |
303 | int oldmask = sigblock (sigmask (sig)); | |
304 | # endif | |
ccc6cda3 | 305 | #endif /* HAVE_POSIX_SIGNALS */ |
726f6388 JA |
306 | |
307 | if (sig == SIGINT) | |
308 | { | |
309 | run_interrupt_trap (); | |
ccc6cda3 | 310 | CLRINTERRUPT; |
726f6388 | 311 | } |
3185942a JA |
312 | #if defined (JOB_CONTROL) && defined (SIGCHLD) |
313 | else if (sig == SIGCHLD && | |
314 | trap_list[SIGCHLD] != (char *)IMPOSSIBLE_TRAP_HANDLER && | |
315 | (sigmodes[SIGCHLD] & SIG_INPROGRESS) == 0) | |
316 | { | |
317 | run_sigchld_trap (pending_traps[sig]); /* use as counter */ | |
318 | } | |
319 | #endif | |
bb70624e JA |
320 | else if (trap_list[sig] == (char *)DEFAULT_SIG || |
321 | trap_list[sig] == (char *)IGNORE_SIG || | |
322 | trap_list[sig] == (char *)IMPOSSIBLE_TRAP_HANDLER) | |
323 | { | |
324 | /* This is possible due to a race condition. Say a bash | |
325 | process has SIGTERM trapped. A subshell is spawned | |
326 | using { list; } & and the parent does something and kills | |
327 | the subshell with SIGTERM. It's possible for the subshell | |
328 | to set pending_traps[SIGTERM] to 1 before the code in | |
329 | execute_cmd.c eventually calls restore_original_signals | |
330 | to reset the SIGTERM signal handler in the subshell. The | |
331 | next time run_pending_traps is called, pending_traps[SIGTERM] | |
332 | will be 1, but the trap handler in trap_list[SIGTERM] will | |
333 | be invalid (probably DEFAULT_SIG, but it could be IGNORE_SIG). | |
334 | Unless we catch this, the subshell will dump core when | |
335 | trap_list[SIGTERM] == DEFAULT_SIG, because DEFAULT_SIG is | |
336 | usually 0x0. */ | |
b80f6443 | 337 | internal_warning (_("run_pending_traps: bad value in trap_list[%d]: %p"), |
f73dda09 | 338 | sig, trap_list[sig]); |
bb70624e JA |
339 | if (trap_list[sig] == (char *)DEFAULT_SIG) |
340 | { | |
b80f6443 | 341 | internal_warning (_("run_pending_traps: signal handler is SIG_DFL, resending %d (%s) to myself"), sig, signal_name (sig)); |
bb70624e JA |
342 | kill (getpid (), sig); |
343 | } | |
344 | } | |
726f6388 | 345 | else |
bb70624e JA |
346 | { |
347 | token_state = save_token_state (); | |
0001803f CR |
348 | save_subst_varlist = subst_assign_varlist; |
349 | subst_assign_varlist = 0; | |
350 | ||
17345e5a | 351 | parse_and_execute (savestring (trap_list[sig]), "trap", SEVAL_NONINT|SEVAL_NOHIST|SEVAL_RESETLINE); |
bb70624e JA |
352 | restore_token_state (token_state); |
353 | free (token_state); | |
0001803f CR |
354 | |
355 | subst_assign_varlist = save_subst_varlist; | |
bb70624e | 356 | } |
726f6388 JA |
357 | |
358 | pending_traps[sig] = 0; | |
359 | ||
ccc6cda3 | 360 | #if defined (HAVE_POSIX_SIGNALS) |
726f6388 JA |
361 | sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL); |
362 | #else | |
363 | # if defined (HAVE_BSD_SIGNALS) | |
364 | sigsetmask (oldmask); | |
365 | # endif | |
366 | #endif /* POSIX_VERSION */ | |
367 | } | |
368 | } | |
369 | ||
495aee44 CR |
370 | #if defined (ARRAY_VARS) |
371 | restore_pipestatus_array (ps); | |
372 | #endif | |
726f6388 JA |
373 | last_command_exit_value = old_exit_value; |
374 | } | |
375 | ||
376 | sighandler | |
377 | trap_handler (sig) | |
378 | int sig; | |
379 | { | |
bb70624e JA |
380 | int oerrno; |
381 | ||
3185942a JA |
382 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) |
383 | { | |
384 | #if defined (DEBUG) | |
385 | internal_warning ("trap_handler: signal %d: signal not trapped", sig); | |
386 | #endif | |
387 | SIGRETURN (0); | |
388 | } | |
389 | ||
726f6388 JA |
390 | if ((sig >= NSIG) || |
391 | (trap_list[sig] == (char *)DEFAULT_SIG) || | |
392 | (trap_list[sig] == (char *)IGNORE_SIG)) | |
b80f6443 | 393 | programming_error (_("trap_handler: bad signal %d"), sig); |
726f6388 JA |
394 | else |
395 | { | |
28ef6c31 | 396 | oerrno = errno; |
ccc6cda3 | 397 | #if defined (MUST_REINSTALL_SIGHANDLERS) |
3185942a JA |
398 | # if defined (JOB_CONTROL) && defined (SIGCHLD) |
399 | if (sig != SIGCHLD) | |
400 | # endif /* JOB_CONTROL && SIGCHLD */ | |
726f6388 | 401 | set_signal_handler (sig, trap_handler); |
ccc6cda3 | 402 | #endif /* MUST_REINSTALL_SIGHANDLERS */ |
726f6388 JA |
403 | |
404 | catch_flag = 1; | |
405 | pending_traps[sig]++; | |
406 | ||
7117c2d2 JA |
407 | if (interrupt_immediately && this_shell_builtin && (this_shell_builtin == wait_builtin)) |
408 | { | |
409 | wait_signal_received = sig; | |
410 | longjmp (wait_intr_buf, 1); | |
411 | } | |
412 | ||
726f6388 JA |
413 | if (interrupt_immediately) |
414 | run_pending_traps (); | |
bb70624e JA |
415 | |
416 | errno = oerrno; | |
726f6388 | 417 | } |
ccc6cda3 JA |
418 | |
419 | SIGRETURN (0); | |
726f6388 JA |
420 | } |
421 | ||
422 | #if defined (JOB_CONTROL) && defined (SIGCHLD) | |
cce855bc JA |
423 | |
424 | #ifdef INCLUDE_UNUSED | |
726f6388 JA |
425 | /* Make COMMAND_STRING be executed when SIGCHLD is caught. */ |
426 | void | |
427 | set_sigchld_trap (command_string) | |
428 | char *command_string; | |
429 | { | |
726f6388 JA |
430 | set_signal (SIGCHLD, command_string); |
431 | } | |
cce855bc | 432 | #endif |
726f6388 | 433 | |
95732b49 | 434 | /* Make COMMAND_STRING be executed when SIGCHLD is caught iff SIGCHLD |
3185942a JA |
435 | is not already trapped. IMPOSSIBLE_TRAP_HANDLER is used as a sentinel |
436 | to make sure that a SIGCHLD trap handler run via run_sigchld_trap can | |
437 | reset the disposition to the default and not have the original signal | |
438 | accidentally restored, undoing the user's command. */ | |
726f6388 JA |
439 | void |
440 | maybe_set_sigchld_trap (command_string) | |
441 | char *command_string; | |
442 | { | |
3185942a | 443 | if ((sigmodes[SIGCHLD] & SIG_TRAPPED) == 0 && trap_list[SIGCHLD] == (char *)IMPOSSIBLE_TRAP_HANDLER) |
726f6388 JA |
444 | set_signal (SIGCHLD, command_string); |
445 | } | |
3185942a JA |
446 | |
447 | /* Temporarily set the SIGCHLD trap string to IMPOSSIBLE_TRAP_HANDLER. Used | |
448 | as a sentinel in run_sigchld_trap and maybe_set_sigchld_trap to see whether | |
449 | or not a SIGCHLD trap handler reset SIGCHLD disposition to the default. */ | |
450 | void | |
451 | set_impossible_sigchld_trap () | |
452 | { | |
453 | restore_default_signal (SIGCHLD); | |
454 | change_signal (SIGCHLD, (char *)IMPOSSIBLE_TRAP_HANDLER); | |
455 | sigmodes[SIGCHLD] &= ~SIG_TRAPPED; /* maybe_set_sigchld_trap checks this */ | |
456 | } | |
726f6388 JA |
457 | #endif /* JOB_CONTROL && SIGCHLD */ |
458 | ||
ccc6cda3 JA |
459 | void |
460 | set_debug_trap (command) | |
726f6388 JA |
461 | char *command; |
462 | { | |
ccc6cda3 JA |
463 | set_signal (DEBUG_TRAP, command); |
464 | } | |
726f6388 | 465 | |
f73dda09 JA |
466 | void |
467 | set_error_trap (command) | |
468 | char *command; | |
469 | { | |
470 | set_signal (ERROR_TRAP, command); | |
471 | } | |
472 | ||
b80f6443 JA |
473 | void |
474 | set_return_trap (command) | |
475 | char *command; | |
476 | { | |
477 | set_signal (RETURN_TRAP, command); | |
478 | } | |
479 | ||
cce855bc | 480 | #ifdef INCLUDE_UNUSED |
ccc6cda3 JA |
481 | void |
482 | set_sigint_trap (command) | |
483 | char *command; | |
484 | { | |
726f6388 JA |
485 | set_signal (SIGINT, command); |
486 | } | |
cce855bc | 487 | #endif |
726f6388 JA |
488 | |
489 | /* Reset the SIGINT handler so that subshells that are doing `shellsy' | |
490 | things, like waiting for command substitution or executing commands | |
491 | in explicit subshells ( ( cmd ) ), can catch interrupts properly. */ | |
492 | SigHandler * | |
493 | set_sigint_handler () | |
494 | { | |
495 | if (sigmodes[SIGINT] & SIG_HARD_IGNORE) | |
496 | return ((SigHandler *)SIG_IGN); | |
497 | ||
498 | else if (sigmodes[SIGINT] & SIG_IGNORED) | |
ccc6cda3 JA |
499 | return ((SigHandler *)set_signal_handler (SIGINT, SIG_IGN)); /* XXX */ |
500 | ||
726f6388 JA |
501 | else if (sigmodes[SIGINT] & SIG_TRAPPED) |
502 | return ((SigHandler *)set_signal_handler (SIGINT, trap_handler)); | |
503 | ||
504 | /* The signal is not trapped, so set the handler to the shell's special | |
505 | interrupt handler. */ | |
506 | else if (interactive) /* XXX - was interactive_shell */ | |
507 | return (set_signal_handler (SIGINT, sigint_sighandler)); | |
508 | else | |
0628567a | 509 | return (set_signal_handler (SIGINT, termsig_sighandler)); |
726f6388 JA |
510 | } |
511 | ||
e8ce775d JA |
512 | /* Return the correct handler for signal SIG according to the values in |
513 | sigmodes[SIG]. */ | |
514 | SigHandler * | |
515 | trap_to_sighandler (sig) | |
516 | int sig; | |
517 | { | |
518 | if (sigmodes[sig] & (SIG_IGNORED|SIG_HARD_IGNORE)) | |
519 | return (SIG_IGN); | |
520 | else if (sigmodes[sig] & SIG_TRAPPED) | |
521 | return (trap_handler); | |
522 | else | |
523 | return (SIG_DFL); | |
524 | } | |
525 | ||
726f6388 JA |
526 | /* Set SIG to call STRING as a command. */ |
527 | void | |
528 | set_signal (sig, string) | |
529 | int sig; | |
530 | char *string; | |
531 | { | |
f73dda09 | 532 | if (SPECIAL_TRAP (sig)) |
ccc6cda3 JA |
533 | { |
534 | change_signal (sig, savestring (string)); | |
d166f048 JA |
535 | if (sig == EXIT_TRAP && interactive == 0) |
536 | initialize_terminating_signals (); | |
ccc6cda3 JA |
537 | return; |
538 | } | |
539 | ||
726f6388 JA |
540 | /* A signal ignored on entry to the shell cannot be trapped or reset, but |
541 | no error is reported when attempting to do so. -- Posix.2 */ | |
542 | if (sigmodes[sig] & SIG_HARD_IGNORE) | |
543 | return; | |
544 | ||
545 | /* Make sure we have original_signals[sig] if the signal has not yet | |
546 | been trapped. */ | |
547 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) | |
548 | { | |
549 | /* If we aren't sure of the original value, check it. */ | |
550 | if (original_signals[sig] == IMPOSSIBLE_TRAP_HANDLER) | |
0628567a | 551 | GETORIGSIG (sig); |
726f6388 | 552 | if (original_signals[sig] == SIG_IGN) |
0628567a | 553 | return; |
726f6388 JA |
554 | } |
555 | ||
556 | /* Only change the system signal handler if SIG_NO_TRAP is not set. | |
557 | The trap command string is changed in either case. The shell signal | |
558 | handlers for SIGINT and SIGCHLD run the user specified traps in an | |
559 | environment in which it is safe to do so. */ | |
560 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) | |
561 | { | |
562 | set_signal_handler (sig, SIG_IGN); | |
563 | change_signal (sig, savestring (string)); | |
564 | set_signal_handler (sig, trap_handler); | |
565 | } | |
566 | else | |
567 | change_signal (sig, savestring (string)); | |
568 | } | |
569 | ||
570 | static void | |
571 | free_trap_command (sig) | |
572 | int sig; | |
573 | { | |
574 | if ((sigmodes[sig] & SIG_TRAPPED) && trap_list[sig] && | |
575 | (trap_list[sig] != (char *)IGNORE_SIG) && | |
576 | (trap_list[sig] != (char *)DEFAULT_SIG) && | |
577 | (trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER)) | |
578 | free (trap_list[sig]); | |
579 | } | |
ccc6cda3 | 580 | |
726f6388 JA |
581 | /* If SIG has a string assigned to it, get rid of it. Then give it |
582 | VALUE. */ | |
583 | static void | |
584 | change_signal (sig, value) | |
585 | int sig; | |
586 | char *value; | |
587 | { | |
d166f048 JA |
588 | if ((sigmodes[sig] & SIG_INPROGRESS) == 0) |
589 | free_trap_command (sig); | |
726f6388 JA |
590 | trap_list[sig] = value; |
591 | ||
592 | sigmodes[sig] |= SIG_TRAPPED; | |
593 | if (value == (char *)IGNORE_SIG) | |
594 | sigmodes[sig] |= SIG_IGNORED; | |
595 | else | |
596 | sigmodes[sig] &= ~SIG_IGNORED; | |
597 | if (sigmodes[sig] & SIG_INPROGRESS) | |
598 | sigmodes[sig] |= SIG_CHANGED; | |
599 | } | |
600 | ||
726f6388 JA |
601 | static void |
602 | get_original_signal (sig) | |
603 | int sig; | |
604 | { | |
605 | /* If we aren't sure the of the original value, then get it. */ | |
0001803f | 606 | if (sig > 0 && sig < NSIG && original_signals[sig] == (SigHandler *)IMPOSSIBLE_TRAP_HANDLER) |
0628567a | 607 | GETORIGSIG (sig); |
726f6388 JA |
608 | } |
609 | ||
495aee44 CR |
610 | void |
611 | get_all_original_signals () | |
612 | { | |
613 | register int i; | |
614 | ||
615 | for (i = 1; i < NSIG; i++) | |
616 | GET_ORIGINAL_SIGNAL (i); | |
617 | } | |
618 | ||
619 | void | |
620 | set_original_signal (sig, handler) | |
621 | int sig; | |
622 | SigHandler *handler; | |
623 | { | |
624 | if (sig > 0 && sig < NSIG && original_signals[sig] == (SigHandler *)IMPOSSIBLE_TRAP_HANDLER) | |
625 | SETORIGSIG (sig, handler); | |
626 | } | |
627 | ||
726f6388 JA |
628 | /* Restore the default action for SIG; i.e., the action the shell |
629 | would have taken before you used the trap command. This is called | |
630 | from trap_builtin (), which takes care to restore the handlers for | |
631 | the signals the shell treats specially. */ | |
632 | void | |
633 | restore_default_signal (sig) | |
634 | int sig; | |
635 | { | |
f73dda09 | 636 | if (SPECIAL_TRAP (sig)) |
726f6388 | 637 | { |
b80f6443 JA |
638 | if ((sig != DEBUG_TRAP && sig != ERROR_TRAP && sig != RETURN_TRAP) || |
639 | (sigmodes[sig] & SIG_INPROGRESS) == 0) | |
d166f048 | 640 | free_trap_command (sig); |
726f6388 JA |
641 | trap_list[sig] = (char *)NULL; |
642 | sigmodes[sig] &= ~SIG_TRAPPED; | |
d166f048 JA |
643 | if (sigmodes[sig] & SIG_INPROGRESS) |
644 | sigmodes[sig] |= SIG_CHANGED; | |
726f6388 JA |
645 | return; |
646 | } | |
647 | ||
648 | GET_ORIGINAL_SIGNAL (sig); | |
649 | ||
650 | /* A signal ignored on entry to the shell cannot be trapped or reset, but | |
651 | no error is reported when attempting to do so. Thanks Posix.2. */ | |
652 | if (sigmodes[sig] & SIG_HARD_IGNORE) | |
653 | return; | |
654 | ||
655 | /* If we aren't trapping this signal, don't bother doing anything else. */ | |
ccc6cda3 | 656 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) |
726f6388 JA |
657 | return; |
658 | ||
659 | /* Only change the signal handler for SIG if it allows it. */ | |
ccc6cda3 | 660 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) |
726f6388 JA |
661 | set_signal_handler (sig, original_signals[sig]); |
662 | ||
663 | /* Change the trap command in either case. */ | |
664 | change_signal (sig, (char *)DEFAULT_SIG); | |
665 | ||
666 | /* Mark the signal as no longer trapped. */ | |
667 | sigmodes[sig] &= ~SIG_TRAPPED; | |
668 | } | |
669 | ||
670 | /* Make this signal be ignored. */ | |
671 | void | |
672 | ignore_signal (sig) | |
673 | int sig; | |
674 | { | |
f73dda09 | 675 | if (SPECIAL_TRAP (sig) && ((sigmodes[sig] & SIG_IGNORED) == 0)) |
ccc6cda3 JA |
676 | { |
677 | change_signal (sig, (char *)IGNORE_SIG); | |
678 | return; | |
679 | } | |
680 | ||
726f6388 JA |
681 | GET_ORIGINAL_SIGNAL (sig); |
682 | ||
683 | /* A signal ignored on entry to the shell cannot be trapped or reset. | |
ccc6cda3 | 684 | No error is reported when the user attempts to do so. */ |
726f6388 JA |
685 | if (sigmodes[sig] & SIG_HARD_IGNORE) |
686 | return; | |
687 | ||
688 | /* If already trapped and ignored, no change necessary. */ | |
ccc6cda3 | 689 | if (sigmodes[sig] & SIG_IGNORED) |
726f6388 JA |
690 | return; |
691 | ||
692 | /* Only change the signal handler for SIG if it allows it. */ | |
ccc6cda3 | 693 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) |
726f6388 JA |
694 | set_signal_handler (sig, SIG_IGN); |
695 | ||
696 | /* Change the trap command in either case. */ | |
697 | change_signal (sig, (char *)IGNORE_SIG); | |
698 | } | |
699 | ||
700 | /* Handle the calling of "trap 0". The only sticky situation is when | |
701 | the command to be executed includes an "exit". This is why we have | |
702 | to provide our own place for top_level to jump to. */ | |
703 | int | |
704 | run_exit_trap () | |
705 | { | |
ccc6cda3 | 706 | char *trap_command; |
b80f6443 | 707 | int code, function_code, retval; |
495aee44 CR |
708 | #if defined (ARRAY_VARS) |
709 | ARRAY *ps; | |
710 | #endif | |
726f6388 | 711 | |
b80f6443 | 712 | trap_saved_exit_value = last_command_exit_value; |
495aee44 CR |
713 | #if defined (ARRAY_VARS) |
714 | ps = save_pipestatus_array (); | |
715 | #endif | |
b80f6443 | 716 | function_code = 0; |
726f6388 | 717 | |
ccc6cda3 JA |
718 | /* Run the trap only if signal 0 is trapped and not ignored, and we are not |
719 | currently running in the trap handler (call to exit in the list of | |
720 | commands given to trap 0). */ | |
721 | if ((sigmodes[EXIT_TRAP] & SIG_TRAPPED) && | |
722 | (sigmodes[EXIT_TRAP] & (SIG_IGNORED|SIG_INPROGRESS)) == 0) | |
726f6388 | 723 | { |
ccc6cda3 JA |
724 | trap_command = savestring (trap_list[EXIT_TRAP]); |
725 | sigmodes[EXIT_TRAP] &= ~SIG_TRAPPED; | |
726 | sigmodes[EXIT_TRAP] |= SIG_INPROGRESS; | |
726f6388 | 727 | |
b80f6443 JA |
728 | retval = trap_saved_exit_value; |
729 | running_trap = 1; | |
730 | ||
726f6388 JA |
731 | code = setjmp (top_level); |
732 | ||
b80f6443 JA |
733 | /* If we're in a function, make sure return longjmps come here, too. */ |
734 | if (return_catch_flag) | |
735 | function_code = setjmp (return_catch); | |
736 | ||
737 | if (code == 0 && function_code == 0) | |
cce855bc JA |
738 | { |
739 | reset_parser (); | |
17345e5a | 740 | parse_and_execute (trap_command, "exit trap", SEVAL_NONINT|SEVAL_NOHIST|SEVAL_RESETLINE); |
cce855bc | 741 | } |
b80f6443 JA |
742 | else if (code == ERREXIT) |
743 | retval = last_command_exit_value; | |
726f6388 | 744 | else if (code == EXITPROG) |
b80f6443 JA |
745 | retval = last_command_exit_value; |
746 | else if (function_code != 0) | |
747 | retval = return_catch_value; | |
726f6388 | 748 | else |
b80f6443 JA |
749 | retval = trap_saved_exit_value; |
750 | ||
751 | running_trap = 0; | |
752 | return retval; | |
726f6388 JA |
753 | } |
754 | ||
495aee44 CR |
755 | #if defined (ARRAY_VARS) |
756 | restore_pipestatus_array (ps); | |
757 | #endif | |
b80f6443 | 758 | return (trap_saved_exit_value); |
726f6388 JA |
759 | } |
760 | ||
ccc6cda3 JA |
761 | void |
762 | run_trap_cleanup (sig) | |
763 | int sig; | |
764 | { | |
765 | sigmodes[sig] &= ~(SIG_INPROGRESS|SIG_CHANGED); | |
766 | } | |
767 | ||
768 | /* Run a trap command for SIG. SIG is one of the signals the shell treats | |
b80f6443 JA |
769 | specially. Returns the exit status of the executed trap command list. */ |
770 | static int | |
ccc6cda3 | 771 | _run_trap_internal (sig, tag) |
726f6388 | 772 | int sig; |
ccc6cda3 | 773 | char *tag; |
726f6388 | 774 | { |
ccc6cda3 | 775 | char *trap_command, *old_trap; |
b80f6443 | 776 | int trap_exit_value, *token_state; |
17345e5a | 777 | int save_return_catch_flag, function_code, flags; |
b80f6443 | 778 | procenv_t save_return_catch; |
0001803f | 779 | WORD_LIST *save_subst_varlist; |
495aee44 CR |
780 | #if defined (ARRAY_VARS) |
781 | ARRAY *ps; | |
782 | #endif | |
ccc6cda3 | 783 | |
b80f6443 | 784 | trap_exit_value = function_code = 0; |
ccc6cda3 JA |
785 | /* Run the trap only if SIG is trapped and not ignored, and we are not |
786 | currently executing in the trap handler. */ | |
787 | if ((sigmodes[sig] & SIG_TRAPPED) && ((sigmodes[sig] & SIG_IGNORED) == 0) && | |
788 | (trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER) && | |
789 | ((sigmodes[sig] & SIG_INPROGRESS) == 0)) | |
790 | { | |
791 | old_trap = trap_list[sig]; | |
792 | sigmodes[sig] |= SIG_INPROGRESS; | |
793 | sigmodes[sig] &= ~SIG_CHANGED; /* just to be sure */ | |
794 | trap_command = savestring (old_trap); | |
795 | ||
796 | running_trap = sig + 1; | |
b80f6443 | 797 | trap_saved_exit_value = last_command_exit_value; |
495aee44 CR |
798 | #if defined (ARRAY_VARS) |
799 | ps = save_pipestatus_array (); | |
800 | #endif | |
bb70624e JA |
801 | |
802 | token_state = save_token_state (); | |
0001803f CR |
803 | save_subst_varlist = subst_assign_varlist; |
804 | subst_assign_varlist = 0; | |
b80f6443 JA |
805 | |
806 | /* If we're in a function, make sure return longjmps come here, too. */ | |
807 | save_return_catch_flag = return_catch_flag; | |
808 | if (return_catch_flag) | |
809 | { | |
810 | COPY_PROCENV (return_catch, save_return_catch); | |
811 | function_code = setjmp (return_catch); | |
812 | } | |
813 | ||
17345e5a | 814 | flags = SEVAL_NONINT|SEVAL_NOHIST; |
89a92869 | 815 | if (sig != DEBUG_TRAP && sig != RETURN_TRAP && sig != ERROR_TRAP) |
17345e5a | 816 | flags |= SEVAL_RESETLINE; |
b80f6443 | 817 | if (function_code == 0) |
17345e5a | 818 | parse_and_execute (trap_command, tag, flags); |
b80f6443 | 819 | |
bb70624e JA |
820 | restore_token_state (token_state); |
821 | free (token_state); | |
822 | ||
0001803f CR |
823 | subst_assign_varlist = save_subst_varlist; |
824 | ||
b80f6443 JA |
825 | trap_exit_value = last_command_exit_value; |
826 | last_command_exit_value = trap_saved_exit_value; | |
495aee44 CR |
827 | #if defined (ARRAY_VARS) |
828 | restore_pipestatus_array (ps); | |
829 | #endif | |
ccc6cda3 JA |
830 | running_trap = 0; |
831 | ||
832 | sigmodes[sig] &= ~SIG_INPROGRESS; | |
833 | ||
834 | if (sigmodes[sig] & SIG_CHANGED) | |
835 | { | |
b80f6443 JA |
836 | #if 0 |
837 | /* Special traps like EXIT, DEBUG, RETURN are handled explicitly in | |
838 | the places where they can be changed using unwind-protects. For | |
839 | example, look at execute_cmd.c:execute_function(). */ | |
840 | if (SPECIAL_TRAP (sig) == 0) | |
841 | #endif | |
842 | free (old_trap); | |
ccc6cda3 JA |
843 | sigmodes[sig] &= ~SIG_CHANGED; |
844 | } | |
b80f6443 JA |
845 | |
846 | if (save_return_catch_flag) | |
847 | { | |
848 | return_catch_flag = save_return_catch_flag; | |
849 | return_catch_value = trap_exit_value; | |
850 | COPY_PROCENV (save_return_catch, return_catch); | |
851 | if (function_code) | |
852 | longjmp (return_catch, 1); | |
853 | } | |
ccc6cda3 | 854 | } |
b80f6443 JA |
855 | |
856 | return trap_exit_value; | |
ccc6cda3 JA |
857 | } |
858 | ||
b80f6443 | 859 | int |
ccc6cda3 JA |
860 | run_debug_trap () |
861 | { | |
b80f6443 | 862 | int trap_exit_value; |
89a92869 CR |
863 | pid_t save_pgrp; |
864 | int save_pipe[2]; | |
b80f6443 JA |
865 | |
866 | /* XXX - question: should the DEBUG trap inherit the RETURN trap? */ | |
867 | trap_exit_value = 0; | |
868 | if ((sigmodes[DEBUG_TRAP] & SIG_TRAPPED) && ((sigmodes[DEBUG_TRAP] & SIG_IGNORED) == 0) && ((sigmodes[DEBUG_TRAP] & SIG_INPROGRESS) == 0)) | |
869 | { | |
89a92869 CR |
870 | #if defined (JOB_CONTROL) |
871 | save_pgrp = pipeline_pgrp; | |
872 | pipeline_pgrp = 0; | |
873 | save_pipeline (1); | |
874 | # if defined (PGRP_PIPE) | |
875 | save_pgrp_pipe (save_pipe, 1); | |
876 | # endif | |
877 | stop_making_children (); | |
878 | #endif | |
879 | ||
b80f6443 | 880 | trap_exit_value = _run_trap_internal (DEBUG_TRAP, "debug trap"); |
89a92869 CR |
881 | |
882 | #if defined (JOB_CONTROL) | |
883 | pipeline_pgrp = save_pgrp; | |
884 | restore_pipeline (1); | |
885 | # if defined (PGRP_PIPE) | |
886 | close_pgrp_pipe (); | |
887 | restore_pgrp_pipe (save_pipe); | |
888 | # endif | |
889 | if (pipeline_pgrp > 0) | |
890 | give_terminal_to (pipeline_pgrp, 1); | |
891 | notify_and_cleanup (); | |
892 | #endif | |
b80f6443 JA |
893 | |
894 | #if defined (DEBUGGER) | |
895 | /* If we're in the debugger and the DEBUG trap returns 2 while we're in | |
896 | a function or sourced script, we force a `return'. */ | |
897 | if (debugging_mode && trap_exit_value == 2 && return_catch_flag) | |
898 | { | |
899 | return_catch_value = trap_exit_value; | |
900 | longjmp (return_catch, 1); | |
901 | } | |
902 | #endif | |
903 | } | |
904 | return trap_exit_value; | |
ccc6cda3 JA |
905 | } |
906 | ||
f73dda09 JA |
907 | void |
908 | run_error_trap () | |
909 | { | |
b80f6443 | 910 | if ((sigmodes[ERROR_TRAP] & SIG_TRAPPED) && ((sigmodes[ERROR_TRAP] & SIG_IGNORED) == 0) && (sigmodes[ERROR_TRAP] & SIG_INPROGRESS) == 0) |
f73dda09 JA |
911 | _run_trap_internal (ERROR_TRAP, "error trap"); |
912 | } | |
913 | ||
b80f6443 JA |
914 | void |
915 | run_return_trap () | |
916 | { | |
917 | int old_exit_value; | |
918 | ||
95732b49 JA |
919 | #if 0 |
920 | if ((sigmodes[DEBUG_TRAP] & SIG_TRAPPED) && (sigmodes[DEBUG_TRAP] & SIG_INPROGRESS)) | |
921 | return; | |
922 | #endif | |
923 | ||
b80f6443 JA |
924 | if ((sigmodes[RETURN_TRAP] & SIG_TRAPPED) && ((sigmodes[RETURN_TRAP] & SIG_IGNORED) == 0) && (sigmodes[RETURN_TRAP] & SIG_INPROGRESS) == 0) |
925 | { | |
926 | old_exit_value = last_command_exit_value; | |
927 | _run_trap_internal (RETURN_TRAP, "return trap"); | |
928 | last_command_exit_value = old_exit_value; | |
929 | } | |
930 | } | |
931 | ||
ccc6cda3 JA |
932 | /* Run a trap set on SIGINT. This is called from throw_to_top_level (), and |
933 | declared here to localize the trap functions. */ | |
934 | void | |
935 | run_interrupt_trap () | |
936 | { | |
937 | _run_trap_internal (SIGINT, "interrupt trap"); | |
726f6388 JA |
938 | } |
939 | ||
940 | /* Free all the allocated strings in the list of traps and reset the trap | |
0001803f CR |
941 | values to the default. Intended to be called from subshells that want |
942 | to complete work done by reset_signal_handlers upon execution of a | |
943 | subsequent `trap' command that changes a signal's disposition. */ | |
726f6388 JA |
944 | void |
945 | free_trap_strings () | |
946 | { | |
947 | register int i; | |
948 | ||
f73dda09 | 949 | for (i = 0; i < BASH_NSIG; i++) |
0001803f | 950 | free_trap_string (i); |
b80f6443 | 951 | trap_list[DEBUG_TRAP] = trap_list[EXIT_TRAP] = trap_list[ERROR_TRAP] = trap_list[RETURN_TRAP] = (char *)NULL; |
726f6388 | 952 | } |
0001803f CR |
953 | |
954 | /* Free a trap command string associated with SIG without changing signal | |
955 | disposition. Intended to be called from free_trap_strings() */ | |
956 | static void | |
957 | free_trap_string (sig) | |
958 | int sig; | |
959 | { | |
960 | change_signal (sig, (char *)DEFAULT_SIG); | |
961 | sigmodes[sig] &= ~SIG_TRAPPED; | |
962 | } | |
726f6388 | 963 | |
495aee44 CR |
964 | /* Reset the handler for SIG to the original value but leave the trap string |
965 | in place. */ | |
726f6388 JA |
966 | static void |
967 | reset_signal (sig) | |
968 | int sig; | |
969 | { | |
970 | set_signal_handler (sig, original_signals[sig]); | |
7117c2d2 | 971 | sigmodes[sig] &= ~SIG_TRAPPED; |
726f6388 JA |
972 | } |
973 | ||
ccc6cda3 JA |
974 | /* Set the handler signal SIG to the original and free any trap |
975 | command associated with it. */ | |
976 | static void | |
977 | restore_signal (sig) | |
978 | int sig; | |
726f6388 | 979 | { |
ccc6cda3 JA |
980 | set_signal_handler (sig, original_signals[sig]); |
981 | change_signal (sig, (char *)DEFAULT_SIG); | |
982 | sigmodes[sig] &= ~SIG_TRAPPED; | |
726f6388 JA |
983 | } |
984 | ||
ccc6cda3 JA |
985 | static void |
986 | reset_or_restore_signal_handlers (reset) | |
f73dda09 | 987 | sh_resetsig_func_t *reset; |
726f6388 JA |
988 | { |
989 | register int i; | |
990 | ||
ccc6cda3 JA |
991 | /* Take care of the exit trap first */ |
992 | if (sigmodes[EXIT_TRAP] & SIG_TRAPPED) | |
726f6388 | 993 | { |
ccc6cda3 | 994 | sigmodes[EXIT_TRAP] &= ~SIG_TRAPPED; |
95732b49 JA |
995 | if (reset != reset_signal) |
996 | { | |
997 | free_trap_command (EXIT_TRAP); | |
998 | trap_list[EXIT_TRAP] = (char *)NULL; | |
999 | } | |
726f6388 | 1000 | } |
b80f6443 | 1001 | |
726f6388 JA |
1002 | for (i = 1; i < NSIG; i++) |
1003 | { | |
ccc6cda3 | 1004 | if (sigmodes[i] & SIG_TRAPPED) |
726f6388 JA |
1005 | { |
1006 | if (trap_list[i] == (char *)IGNORE_SIG) | |
1007 | set_signal_handler (i, SIG_IGN); | |
1008 | else | |
ccc6cda3 | 1009 | (*reset) (i); |
726f6388 | 1010 | } |
ccc6cda3 JA |
1011 | else if (sigmodes[i] & SIG_SPECIAL) |
1012 | (*reset) (i); | |
726f6388 | 1013 | } |
f73dda09 JA |
1014 | |
1015 | /* Command substitution and other child processes don't inherit the | |
b80f6443 JA |
1016 | debug, error, or return traps. If we're in the debugger, and the |
1017 | `functrace' or `errtrace' options have been set, then let command | |
1018 | substitutions inherit them. Let command substitution inherit the | |
1019 | RETURN trap if we're in the debugger and tracing functions. */ | |
0628567a JA |
1020 | if (function_trace_mode == 0) |
1021 | { | |
1022 | sigmodes[DEBUG_TRAP] &= ~SIG_TRAPPED; | |
1023 | sigmodes[RETURN_TRAP] &= ~SIG_TRAPPED; | |
1024 | } | |
1025 | if (error_trace_mode == 0) | |
b80f6443 | 1026 | sigmodes[ERROR_TRAP] &= ~SIG_TRAPPED; |
726f6388 JA |
1027 | } |
1028 | ||
f73dda09 | 1029 | /* Reset trapped signals to their original values, but don't free the |
495aee44 CR |
1030 | trap strings. Called by the command substitution code and other places |
1031 | that create a "subshell environment". */ | |
726f6388 | 1032 | void |
ccc6cda3 | 1033 | reset_signal_handlers () |
726f6388 | 1034 | { |
ccc6cda3 JA |
1035 | reset_or_restore_signal_handlers (reset_signal); |
1036 | } | |
726f6388 | 1037 | |
ccc6cda3 JA |
1038 | /* Reset all trapped signals to their original values. Signals set to be |
1039 | ignored with trap '' SIGNAL should be ignored, so we make sure that they | |
1040 | are. Called by child processes after they are forked. */ | |
1041 | void | |
1042 | restore_original_signals () | |
1043 | { | |
1044 | reset_or_restore_signal_handlers (restore_signal); | |
726f6388 JA |
1045 | } |
1046 | ||
1047 | /* If a trap handler exists for signal SIG, then call it; otherwise just | |
1048 | return failure. */ | |
1049 | int | |
1050 | maybe_call_trap_handler (sig) | |
1051 | int sig; | |
1052 | { | |
1053 | /* Call the trap handler for SIG if the signal is trapped and not ignored. */ | |
ccc6cda3 | 1054 | if ((sigmodes[sig] & SIG_TRAPPED) && ((sigmodes[sig] & SIG_IGNORED) == 0)) |
726f6388 JA |
1055 | { |
1056 | switch (sig) | |
1057 | { | |
1058 | case SIGINT: | |
1059 | run_interrupt_trap (); | |
1060 | break; | |
ccc6cda3 | 1061 | case EXIT_TRAP: |
726f6388 JA |
1062 | run_exit_trap (); |
1063 | break; | |
ccc6cda3 JA |
1064 | case DEBUG_TRAP: |
1065 | run_debug_trap (); | |
1066 | break; | |
f73dda09 JA |
1067 | case ERROR_TRAP: |
1068 | run_error_trap (); | |
1069 | break; | |
726f6388 JA |
1070 | default: |
1071 | trap_handler (sig); | |
1072 | break; | |
1073 | } | |
1074 | return (1); | |
1075 | } | |
1076 | else | |
1077 | return (0); | |
1078 | } | |
1079 | ||
1080 | int | |
1081 | signal_is_trapped (sig) | |
1082 | int sig; | |
1083 | { | |
1084 | return (sigmodes[sig] & SIG_TRAPPED); | |
1085 | } | |
1086 | ||
1087 | int | |
1088 | signal_is_special (sig) | |
1089 | int sig; | |
1090 | { | |
1091 | return (sigmodes[sig] & SIG_SPECIAL); | |
1092 | } | |
1093 | ||
1094 | int | |
1095 | signal_is_ignored (sig) | |
1096 | int sig; | |
1097 | { | |
1098 | return (sigmodes[sig] & SIG_IGNORED); | |
1099 | } | |
1100 | ||
495aee44 CR |
1101 | int |
1102 | signal_is_hard_ignored (sig) | |
1103 | int sig; | |
1104 | { | |
1105 | return (sigmodes[sig] & SIG_HARD_IGNORE); | |
1106 | } | |
1107 | ||
726f6388 JA |
1108 | void |
1109 | set_signal_ignored (sig) | |
1110 | int sig; | |
1111 | { | |
1112 | sigmodes[sig] |= SIG_HARD_IGNORE; | |
ccc6cda3 | 1113 | original_signals[sig] = SIG_IGN; |
726f6388 | 1114 | } |
95732b49 JA |
1115 | |
1116 | int | |
1117 | signal_in_progress (sig) | |
1118 | int sig; | |
1119 | { | |
1120 | return (sigmodes[sig] & SIG_INPROGRESS); | |
1121 | } |