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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 | ||
d233b485 | 4 | /* Copyright (C) 1987-2018 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 CR |
92 | extern volatile int from_return_trap; |
93 | ||
0001803f | 94 | extern WORD_LIST *subst_assign_varlist; |
7117c2d2 | 95 | |
726f6388 JA |
96 | /* The list of things to do originally, before we started trapping. */ |
97 | SigHandler *original_signals[NSIG]; | |
98 | ||
99 | /* For each signal, a slot for a string, which is a command to be | |
ac50fbac | 100 | executed when that signal is received. The slot can also contain |
726f6388 JA |
101 | DEFAULT_SIG, which means do whatever you were going to do before |
102 | you were so rudely interrupted, or IGNORE_SIG, which says ignore | |
103 | this signal. */ | |
f73dda09 | 104 | char *trap_list[BASH_NSIG]; |
726f6388 JA |
105 | |
106 | /* A bitmap of signals received for which we have trap handlers. */ | |
107 | int pending_traps[NSIG]; | |
108 | ||
ccc6cda3 JA |
109 | /* Set to the number of the signal we're running the trap for + 1. |
110 | Used in execute_cmd.c and builtins/common.c to clean up when | |
111 | parse_and_execute does not return normally after executing the | |
112 | trap command (e.g., when `return' is executed in the trap command). */ | |
113 | int running_trap; | |
114 | ||
b80f6443 JA |
115 | /* Set to last_command_exit_value before running a trap. */ |
116 | int trap_saved_exit_value; | |
d166f048 | 117 | |
7117c2d2 JA |
118 | /* The (trapped) signal received while executing in the `wait' builtin */ |
119 | int wait_signal_received; | |
120 | ||
ac50fbac CR |
121 | int trapped_signal_received; |
122 | ||
0628567a JA |
123 | #define GETORIGSIG(sig) \ |
124 | do { \ | |
125 | original_signals[sig] = (SigHandler *)set_signal_handler (sig, SIG_DFL); \ | |
126 | set_signal_handler (sig, original_signals[sig]); \ | |
127 | if (original_signals[sig] == SIG_IGN) \ | |
128 | sigmodes[sig] |= SIG_HARD_IGNORE; \ | |
129 | } while (0) | |
130 | ||
495aee44 CR |
131 | #define SETORIGSIG(sig,handler) \ |
132 | do { \ | |
133 | original_signals[sig] = handler; \ | |
134 | if (original_signals[sig] == SIG_IGN) \ | |
135 | sigmodes[sig] |= SIG_HARD_IGNORE; \ | |
136 | } while (0) | |
137 | ||
0628567a JA |
138 | #define GET_ORIGINAL_SIGNAL(sig) \ |
139 | if (sig && sig < NSIG && original_signals[sig] == IMPOSSIBLE_TRAP_HANDLER) \ | |
140 | GETORIGSIG(sig) | |
141 | ||
726f6388 JA |
142 | void |
143 | initialize_traps () | |
144 | { | |
145 | register int i; | |
146 | ||
0628567a JA |
147 | initialize_signames(); |
148 | ||
b80f6443 JA |
149 | trap_list[EXIT_TRAP] = trap_list[DEBUG_TRAP] = trap_list[ERROR_TRAP] = trap_list[RETURN_TRAP] = (char *)NULL; |
150 | sigmodes[EXIT_TRAP] = sigmodes[DEBUG_TRAP] = sigmodes[ERROR_TRAP] = sigmodes[RETURN_TRAP] = SIG_INHERITED; | |
ccc6cda3 | 151 | original_signals[EXIT_TRAP] = IMPOSSIBLE_TRAP_HANDLER; |
726f6388 JA |
152 | |
153 | for (i = 1; i < NSIG; i++) | |
154 | { | |
155 | pending_traps[i] = 0; | |
156 | trap_list[i] = (char *)DEFAULT_SIG; | |
495aee44 | 157 | sigmodes[i] = SIG_INHERITED; /* XXX - only set, not used */ |
726f6388 JA |
158 | original_signals[i] = IMPOSSIBLE_TRAP_HANDLER; |
159 | } | |
160 | ||
161 | /* Show which signals are treated specially by the shell. */ | |
162 | #if defined (SIGCHLD) | |
0628567a | 163 | GETORIGSIG (SIGCHLD); |
726f6388 JA |
164 | sigmodes[SIGCHLD] |= (SIG_SPECIAL | SIG_NO_TRAP); |
165 | #endif /* SIGCHLD */ | |
166 | ||
0628567a | 167 | GETORIGSIG (SIGINT); |
726f6388 JA |
168 | sigmodes[SIGINT] |= SIG_SPECIAL; |
169 | ||
b72432fd JA |
170 | #if defined (__BEOS__) |
171 | /* BeOS sets SIGINT to SIG_IGN! */ | |
172 | original_signals[SIGINT] = SIG_DFL; | |
0628567a | 173 | sigmodes[SIGINT] &= ~SIG_HARD_IGNORE; |
b72432fd JA |
174 | #endif |
175 | ||
0628567a | 176 | GETORIGSIG (SIGQUIT); |
726f6388 JA |
177 | sigmodes[SIGQUIT] |= SIG_SPECIAL; |
178 | ||
179 | if (interactive) | |
180 | { | |
0628567a | 181 | GETORIGSIG (SIGTERM); |
726f6388 JA |
182 | sigmodes[SIGTERM] |= SIG_SPECIAL; |
183 | } | |
a0c0a00f CR |
184 | |
185 | get_original_tty_job_signals (); | |
726f6388 JA |
186 | } |
187 | ||
ac50fbac | 188 | #ifdef DEBUG |
bb70624e JA |
189 | /* Return a printable representation of the trap handler for SIG. */ |
190 | static char * | |
191 | trap_handler_string (sig) | |
192 | int sig; | |
193 | { | |
194 | if (trap_list[sig] == (char *)DEFAULT_SIG) | |
195 | return "DEFAULT_SIG"; | |
196 | else if (trap_list[sig] == (char *)IGNORE_SIG) | |
197 | return "IGNORE_SIG"; | |
198 | else if (trap_list[sig] == (char *)IMPOSSIBLE_TRAP_HANDLER) | |
199 | return "IMPOSSIBLE_TRAP_HANDLER"; | |
200 | else if (trap_list[sig]) | |
201 | return trap_list[sig]; | |
202 | else | |
203 | return "NULL"; | |
204 | } | |
205 | #endif | |
206 | ||
726f6388 JA |
207 | /* Return the print name of this signal. */ |
208 | char * | |
209 | signal_name (sig) | |
210 | int sig; | |
211 | { | |
cce855bc JA |
212 | char *ret; |
213 | ||
214 | /* on cygwin32, signal_names[sig] could be null */ | |
b80f6443 JA |
215 | ret = (sig >= BASH_NSIG || sig < 0 || signal_names[sig] == NULL) |
216 | ? _("invalid signal number") | |
217 | : signal_names[sig]; | |
218 | ||
cce855bc | 219 | return ret; |
726f6388 JA |
220 | } |
221 | ||
222 | /* Turn a string into a signal number, or a number into | |
223 | a signal number. If STRING is "2", "SIGINT", or "INT", | |
224 | then (int)2 is returned. Return NO_SIG if STRING doesn't | |
225 | contain a valid signal descriptor. */ | |
226 | int | |
b80f6443 | 227 | decode_signal (string, flags) |
726f6388 | 228 | char *string; |
b80f6443 | 229 | int flags; |
726f6388 | 230 | { |
7117c2d2 | 231 | intmax_t sig; |
b80f6443 | 232 | char *name; |
726f6388 | 233 | |
ccc6cda3 | 234 | if (legal_number (string, &sig)) |
f73dda09 | 235 | return ((sig >= 0 && sig < NSIG) ? (int)sig : NO_SIG); |
726f6388 | 236 | |
d233b485 CR |
237 | #if defined (SIGRTMIN) && defined (SIGRTMAX) |
238 | if (STREQN (string, "SIGRTMIN+", 9) || ((flags & DSIG_NOCASE) && strncasecmp (string, "SIGRTMIN+", 9) == 0)) | |
239 | { | |
240 | if (legal_number (string+9, &sig) && sig >= 0 && sig <= SIGRTMAX - SIGRTMIN) | |
241 | return (SIGRTMIN + sig); | |
242 | else | |
243 | return NO_SIG; | |
244 | } | |
245 | else if (STREQN (string, "RTMIN+", 6) || ((flags & DSIG_NOCASE) && strncasecmp (string, "RTMIN+", 6) == 0)) | |
246 | { | |
247 | if (legal_number (string+6, &sig) && sig >= 0 && sig <= SIGRTMAX - SIGRTMIN) | |
248 | return (SIGRTMIN + sig); | |
249 | else | |
250 | return NO_SIG; | |
251 | } | |
252 | #endif /* SIGRTMIN && SIGRTMAX */ | |
253 | ||
e8ce775d | 254 | /* A leading `SIG' may be omitted. */ |
f73dda09 | 255 | for (sig = 0; sig < BASH_NSIG; sig++) |
b72432fd | 256 | { |
b80f6443 JA |
257 | name = signal_names[sig]; |
258 | if (name == 0 || name[0] == '\0') | |
b72432fd | 259 | continue; |
b80f6443 | 260 | |
ac50fbac | 261 | /* Check name without the SIG prefix first case sensitively or |
b80f6443 JA |
262 | insensitively depending on whether flags includes DSIG_NOCASE */ |
263 | if (STREQN (name, "SIG", 3)) | |
264 | { | |
265 | name += 3; | |
266 | ||
267 | if ((flags & DSIG_NOCASE) && strcasecmp (string, name) == 0) | |
268 | return ((int)sig); | |
269 | else if ((flags & DSIG_NOCASE) == 0 && strcmp (string, name) == 0) | |
270 | return ((int)sig); | |
271 | /* If we can't use the `SIG' prefix to match, punt on this | |
272 | name now. */ | |
273 | else if ((flags & DSIG_SIGPREFIX) == 0) | |
274 | continue; | |
275 | } | |
276 | ||
277 | /* Check name with SIG prefix case sensitively or insensitively | |
278 | depending on whether flags includes DSIG_NOCASE */ | |
279 | name = signal_names[sig]; | |
280 | if ((flags & DSIG_NOCASE) && strcasecmp (string, name) == 0) | |
281 | return ((int)sig); | |
282 | else if ((flags & DSIG_NOCASE) == 0 && strcmp (string, name) == 0) | |
b72432fd JA |
283 | return ((int)sig); |
284 | } | |
726f6388 JA |
285 | |
286 | return (NO_SIG); | |
287 | } | |
288 | ||
289 | /* Non-zero when we catch a trapped signal. */ | |
ccc6cda3 | 290 | static int catch_flag; |
726f6388 JA |
291 | |
292 | void | |
293 | run_pending_traps () | |
294 | { | |
295 | register int sig; | |
a0c0a00f | 296 | int old_exit_value, x; |
0001803f | 297 | WORD_LIST *save_subst_varlist; |
a0c0a00f | 298 | HASH_TABLE *save_tempenv; |
ac50fbac | 299 | sh_parser_state_t pstate; |
495aee44 CR |
300 | #if defined (ARRAY_VARS) |
301 | ARRAY *ps; | |
302 | #endif | |
726f6388 JA |
303 | |
304 | if (catch_flag == 0) /* simple optimization */ | |
305 | return; | |
306 | ||
ac50fbac CR |
307 | if (running_trap > 0) |
308 | { | |
309 | #if defined (DEBUG) | |
310 | internal_warning ("run_pending_traps: recursive invocation while running trap for signal %d", running_trap-1); | |
311 | #endif | |
a0c0a00f CR |
312 | #if defined (SIGWINCH) |
313 | if (running_trap == SIGWINCH+1 && pending_traps[SIGWINCH]) | |
314 | return; /* no recursive SIGWINCH trap invocations */ | |
ac50fbac | 315 | #endif |
d233b485 CR |
316 | /* could check for running the trap handler for the same signal here |
317 | (running_trap == sig+1) */ | |
318 | if (evalnest_max > 0 && evalnest > evalnest_max) | |
319 | { | |
320 | internal_error (_("trap handler: maximum trap handler level exceeded (%d)"), evalnest_max); | |
321 | evalnest = 0; | |
322 | jump_to_top_level (DISCARD); | |
323 | } | |
ac50fbac CR |
324 | } |
325 | ||
326 | catch_flag = trapped_signal_received = 0; | |
726f6388 JA |
327 | |
328 | /* Preserve $? when running trap. */ | |
a0c0a00f | 329 | trap_saved_exit_value = old_exit_value = last_command_exit_value; |
495aee44 CR |
330 | #if defined (ARRAY_VARS) |
331 | ps = save_pipestatus_array (); | |
332 | #endif | |
726f6388 JA |
333 | |
334 | for (sig = 1; sig < NSIG; sig++) | |
335 | { | |
336 | /* XXX this could be made into a counter by using | |
28ef6c31 | 337 | while (pending_traps[sig]--) instead of the if statement. */ |
726f6388 JA |
338 | if (pending_traps[sig]) |
339 | { | |
ac50fbac CR |
340 | if (running_trap == sig+1) |
341 | /*continue*/; | |
726f6388 | 342 | |
ac50fbac | 343 | running_trap = sig + 1; |
726f6388 JA |
344 | |
345 | if (sig == SIGINT) | |
346 | { | |
ac50fbac | 347 | pending_traps[sig] = 0; /* XXX */ |
d233b485 CR |
348 | /* We don't modify evalnest here, since run_interrupt_trap() calls |
349 | _run_trap_internal, which does. */ | |
a0c0a00f | 350 | run_interrupt_trap (0); |
d233b485 | 351 | CLRINTERRUPT; /* interrupts don't stack */ |
726f6388 | 352 | } |
3185942a JA |
353 | #if defined (JOB_CONTROL) && defined (SIGCHLD) |
354 | else if (sig == SIGCHLD && | |
355 | trap_list[SIGCHLD] != (char *)IMPOSSIBLE_TRAP_HANDLER && | |
356 | (sigmodes[SIGCHLD] & SIG_INPROGRESS) == 0) | |
357 | { | |
ac50fbac | 358 | sigmodes[SIGCHLD] |= SIG_INPROGRESS; |
d233b485 CR |
359 | /* We modify evalnest here even though run_sigchld_trap can run |
360 | the trap action more than once */ | |
361 | evalnest++; | |
a0c0a00f CR |
362 | x = pending_traps[sig]; |
363 | pending_traps[sig] = 0; | |
364 | run_sigchld_trap (x); /* use as counter */ | |
365 | running_trap = 0; | |
d233b485 | 366 | evalnest--; |
ac50fbac | 367 | sigmodes[SIGCHLD] &= ~SIG_INPROGRESS; |
a0c0a00f CR |
368 | /* continue here rather than reset pending_traps[SIGCHLD] below in |
369 | case there are recursive calls to run_pending_traps and children | |
370 | have been reaped while run_sigchld_trap was running. */ | |
371 | continue; | |
ac50fbac CR |
372 | } |
373 | else if (sig == SIGCHLD && | |
374 | trap_list[SIGCHLD] == (char *)IMPOSSIBLE_TRAP_HANDLER && | |
375 | (sigmodes[SIGCHLD] & SIG_INPROGRESS) != 0) | |
376 | { | |
377 | /* This can happen when run_pending_traps is called while | |
378 | running a SIGCHLD trap handler. */ | |
379 | running_trap = 0; | |
380 | /* want to leave pending_traps[SIGCHLD] alone here */ | |
381 | continue; /* XXX */ | |
382 | } | |
383 | else if (sig == SIGCHLD && (sigmodes[SIGCHLD] & SIG_INPROGRESS)) | |
384 | { | |
385 | /* whoops -- print warning? */ | |
386 | running_trap = 0; /* XXX */ | |
387 | /* want to leave pending_traps[SIGCHLD] alone here */ | |
388 | continue; | |
3185942a JA |
389 | } |
390 | #endif | |
bb70624e JA |
391 | else if (trap_list[sig] == (char *)DEFAULT_SIG || |
392 | trap_list[sig] == (char *)IGNORE_SIG || | |
393 | trap_list[sig] == (char *)IMPOSSIBLE_TRAP_HANDLER) | |
394 | { | |
395 | /* This is possible due to a race condition. Say a bash | |
396 | process has SIGTERM trapped. A subshell is spawned | |
397 | using { list; } & and the parent does something and kills | |
398 | the subshell with SIGTERM. It's possible for the subshell | |
399 | to set pending_traps[SIGTERM] to 1 before the code in | |
400 | execute_cmd.c eventually calls restore_original_signals | |
401 | to reset the SIGTERM signal handler in the subshell. The | |
402 | next time run_pending_traps is called, pending_traps[SIGTERM] | |
403 | will be 1, but the trap handler in trap_list[SIGTERM] will | |
404 | be invalid (probably DEFAULT_SIG, but it could be IGNORE_SIG). | |
405 | Unless we catch this, the subshell will dump core when | |
406 | trap_list[SIGTERM] == DEFAULT_SIG, because DEFAULT_SIG is | |
407 | usually 0x0. */ | |
b80f6443 | 408 | internal_warning (_("run_pending_traps: bad value in trap_list[%d]: %p"), |
f73dda09 | 409 | sig, trap_list[sig]); |
bb70624e JA |
410 | if (trap_list[sig] == (char *)DEFAULT_SIG) |
411 | { | |
b80f6443 | 412 | internal_warning (_("run_pending_traps: signal handler is SIG_DFL, resending %d (%s) to myself"), sig, signal_name (sig)); |
bb70624e JA |
413 | kill (getpid (), sig); |
414 | } | |
415 | } | |
726f6388 | 416 | else |
bb70624e | 417 | { |
ac50fbac CR |
418 | /* XXX - should we use save_parser_state/restore_parser_state? */ |
419 | save_parser_state (&pstate); | |
0001803f CR |
420 | save_subst_varlist = subst_assign_varlist; |
421 | subst_assign_varlist = 0; | |
a0c0a00f CR |
422 | save_tempenv = temporary_env; |
423 | temporary_env = 0; /* traps should not run with temporary env */ | |
0001803f | 424 | |
ac50fbac CR |
425 | #if defined (JOB_CONTROL) |
426 | save_pipeline (1); /* XXX only provides one save level */ | |
427 | #endif | |
428 | /* XXX - set pending_traps[sig] = 0 here? */ | |
429 | pending_traps[sig] = 0; | |
d233b485 | 430 | evalnest++; |
ac50fbac | 431 | evalstring (savestring (trap_list[sig]), "trap", SEVAL_NONINT|SEVAL_NOHIST|SEVAL_RESETLINE); |
d233b485 | 432 | evalnest--; |
ac50fbac CR |
433 | #if defined (JOB_CONTROL) |
434 | restore_pipeline (1); | |
435 | #endif | |
0001803f CR |
436 | |
437 | subst_assign_varlist = save_subst_varlist; | |
ac50fbac | 438 | restore_parser_state (&pstate); |
a0c0a00f | 439 | temporary_env = save_tempenv; |
bb70624e | 440 | } |
726f6388 | 441 | |
ac50fbac CR |
442 | pending_traps[sig] = 0; /* XXX - move before evalstring? */ |
443 | running_trap = 0; | |
726f6388 JA |
444 | } |
445 | } | |
446 | ||
495aee44 CR |
447 | #if defined (ARRAY_VARS) |
448 | restore_pipestatus_array (ps); | |
449 | #endif | |
726f6388 JA |
450 | last_command_exit_value = old_exit_value; |
451 | } | |
452 | ||
453 | sighandler | |
454 | trap_handler (sig) | |
455 | int sig; | |
456 | { | |
bb70624e JA |
457 | int oerrno; |
458 | ||
3185942a JA |
459 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) |
460 | { | |
461 | #if defined (DEBUG) | |
462 | internal_warning ("trap_handler: signal %d: signal not trapped", sig); | |
463 | #endif | |
464 | SIGRETURN (0); | |
465 | } | |
466 | ||
726f6388 JA |
467 | if ((sig >= NSIG) || |
468 | (trap_list[sig] == (char *)DEFAULT_SIG) || | |
469 | (trap_list[sig] == (char *)IGNORE_SIG)) | |
b80f6443 | 470 | programming_error (_("trap_handler: bad signal %d"), sig); |
726f6388 JA |
471 | else |
472 | { | |
28ef6c31 | 473 | oerrno = errno; |
ccc6cda3 | 474 | #if defined (MUST_REINSTALL_SIGHANDLERS) |
3185942a JA |
475 | # if defined (JOB_CONTROL) && defined (SIGCHLD) |
476 | if (sig != SIGCHLD) | |
477 | # endif /* JOB_CONTROL && SIGCHLD */ | |
726f6388 | 478 | set_signal_handler (sig, trap_handler); |
ccc6cda3 | 479 | #endif /* MUST_REINSTALL_SIGHANDLERS */ |
726f6388 JA |
480 | |
481 | catch_flag = 1; | |
482 | pending_traps[sig]++; | |
ac50fbac CR |
483 | trapped_signal_received = sig; |
484 | ||
485 | if (this_shell_builtin && (this_shell_builtin == wait_builtin)) | |
7117c2d2 JA |
486 | { |
487 | wait_signal_received = sig; | |
a0c0a00f CR |
488 | if (interrupt_immediately && wait_intr_flag) |
489 | sh_longjmp (wait_intr_buf, 1); | |
7117c2d2 JA |
490 | } |
491 | ||
ac50fbac CR |
492 | #if defined (READLINE) |
493 | /* Set the event hook so readline will call it after the signal handlers | |
494 | finish executing, so if this interrupted character input we can get | |
495 | quick response. */ | |
496 | if (RL_ISSTATE (RL_STATE_SIGHANDLER) && interrupt_immediately == 0) | |
497 | bashline_set_event_hook (); | |
498 | #endif | |
499 | ||
726f6388 JA |
500 | if (interrupt_immediately) |
501 | run_pending_traps (); | |
bb70624e JA |
502 | |
503 | errno = oerrno; | |
726f6388 | 504 | } |
d233b485 | 505 | |
ccc6cda3 | 506 | SIGRETURN (0); |
726f6388 JA |
507 | } |
508 | ||
ac50fbac CR |
509 | int |
510 | first_pending_trap () | |
511 | { | |
512 | register int i; | |
513 | ||
514 | for (i = 1; i < NSIG; i++) | |
515 | if (pending_traps[i]) | |
516 | return i; | |
517 | return -1; | |
518 | } | |
519 | ||
d233b485 CR |
520 | /* Return > 0 if any of the "real" signals (not fake signals like EXIT) are |
521 | trapped. */ | |
ac50fbac CR |
522 | int |
523 | any_signals_trapped () | |
524 | { | |
525 | register int i; | |
526 | ||
527 | for (i = 1; i < NSIG; i++) | |
528 | if (sigmodes[i] & SIG_TRAPPED) | |
529 | return i; | |
530 | return -1; | |
531 | } | |
532 | ||
533 | void | |
534 | check_signals () | |
535 | { | |
536 | CHECK_ALRM; /* set by the read builtin */ | |
537 | QUIT; | |
538 | } | |
539 | ||
540 | /* Convenience functions the rest of the shell can use */ | |
541 | void | |
542 | check_signals_and_traps () | |
543 | { | |
544 | check_signals (); | |
545 | ||
546 | run_pending_traps (); | |
547 | } | |
548 | ||
726f6388 | 549 | #if defined (JOB_CONTROL) && defined (SIGCHLD) |
cce855bc JA |
550 | |
551 | #ifdef INCLUDE_UNUSED | |
726f6388 JA |
552 | /* Make COMMAND_STRING be executed when SIGCHLD is caught. */ |
553 | void | |
554 | set_sigchld_trap (command_string) | |
555 | char *command_string; | |
556 | { | |
726f6388 JA |
557 | set_signal (SIGCHLD, command_string); |
558 | } | |
cce855bc | 559 | #endif |
726f6388 | 560 | |
95732b49 | 561 | /* Make COMMAND_STRING be executed when SIGCHLD is caught iff SIGCHLD |
3185942a JA |
562 | is not already trapped. IMPOSSIBLE_TRAP_HANDLER is used as a sentinel |
563 | to make sure that a SIGCHLD trap handler run via run_sigchld_trap can | |
564 | reset the disposition to the default and not have the original signal | |
565 | accidentally restored, undoing the user's command. */ | |
726f6388 JA |
566 | void |
567 | maybe_set_sigchld_trap (command_string) | |
568 | char *command_string; | |
569 | { | |
3185942a | 570 | if ((sigmodes[SIGCHLD] & SIG_TRAPPED) == 0 && trap_list[SIGCHLD] == (char *)IMPOSSIBLE_TRAP_HANDLER) |
726f6388 JA |
571 | set_signal (SIGCHLD, command_string); |
572 | } | |
3185942a JA |
573 | |
574 | /* Temporarily set the SIGCHLD trap string to IMPOSSIBLE_TRAP_HANDLER. Used | |
575 | as a sentinel in run_sigchld_trap and maybe_set_sigchld_trap to see whether | |
576 | or not a SIGCHLD trap handler reset SIGCHLD disposition to the default. */ | |
577 | void | |
578 | set_impossible_sigchld_trap () | |
579 | { | |
580 | restore_default_signal (SIGCHLD); | |
581 | change_signal (SIGCHLD, (char *)IMPOSSIBLE_TRAP_HANDLER); | |
582 | sigmodes[SIGCHLD] &= ~SIG_TRAPPED; /* maybe_set_sigchld_trap checks this */ | |
583 | } | |
ac50fbac CR |
584 | |
585 | /* Act as if we received SIGCHLD NCHILD times and increment | |
586 | pending_traps[SIGCHLD] by that amount. This allows us to still run the | |
587 | SIGCHLD trap once for each exited child. */ | |
588 | void | |
589 | queue_sigchld_trap (nchild) | |
590 | int nchild; | |
591 | { | |
592 | if (nchild > 0) | |
593 | { | |
594 | catch_flag = 1; | |
595 | pending_traps[SIGCHLD] += nchild; | |
596 | trapped_signal_received = SIGCHLD; | |
597 | } | |
598 | } | |
726f6388 JA |
599 | #endif /* JOB_CONTROL && SIGCHLD */ |
600 | ||
a0c0a00f CR |
601 | /* Set a trap for SIG only if SIG is not already trapped. */ |
602 | static inline void | |
603 | trap_if_untrapped (sig, command) | |
604 | int sig; | |
605 | char *command; | |
606 | { | |
607 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) | |
608 | set_signal (sig, command); | |
609 | } | |
610 | ||
ccc6cda3 JA |
611 | void |
612 | set_debug_trap (command) | |
726f6388 JA |
613 | char *command; |
614 | { | |
ccc6cda3 JA |
615 | set_signal (DEBUG_TRAP, command); |
616 | } | |
726f6388 | 617 | |
a0c0a00f CR |
618 | /* Separate function to call when functions and sourced files want to restore |
619 | the original version of the DEBUG trap before returning. Unless the -T | |
620 | option is set, source and shell function execution save the old debug trap | |
621 | and unset the trap. If the function or sourced file changes the DEBUG trap, | |
622 | SIG_TRAPPED will be set and we don't bother restoring the original trap string. | |
623 | This is used by both functions and the source builtin. */ | |
624 | void | |
625 | maybe_set_debug_trap (command) | |
626 | char *command; | |
627 | { | |
628 | trap_if_untrapped (DEBUG_TRAP, command); | |
629 | } | |
630 | ||
f73dda09 JA |
631 | void |
632 | set_error_trap (command) | |
633 | char *command; | |
634 | { | |
635 | set_signal (ERROR_TRAP, command); | |
636 | } | |
637 | ||
a0c0a00f CR |
638 | void |
639 | maybe_set_error_trap (command) | |
640 | char *command; | |
641 | { | |
642 | trap_if_untrapped (ERROR_TRAP, command); | |
643 | } | |
644 | ||
b80f6443 JA |
645 | void |
646 | set_return_trap (command) | |
647 | char *command; | |
648 | { | |
649 | set_signal (RETURN_TRAP, command); | |
650 | } | |
651 | ||
a0c0a00f CR |
652 | void |
653 | maybe_set_return_trap (command) | |
654 | char *command; | |
655 | { | |
656 | trap_if_untrapped (RETURN_TRAP, command); | |
657 | } | |
658 | ||
cce855bc | 659 | #ifdef INCLUDE_UNUSED |
ccc6cda3 JA |
660 | void |
661 | set_sigint_trap (command) | |
662 | char *command; | |
663 | { | |
726f6388 JA |
664 | set_signal (SIGINT, command); |
665 | } | |
cce855bc | 666 | #endif |
726f6388 JA |
667 | |
668 | /* Reset the SIGINT handler so that subshells that are doing `shellsy' | |
669 | things, like waiting for command substitution or executing commands | |
670 | in explicit subshells ( ( cmd ) ), can catch interrupts properly. */ | |
671 | SigHandler * | |
672 | set_sigint_handler () | |
673 | { | |
674 | if (sigmodes[SIGINT] & SIG_HARD_IGNORE) | |
675 | return ((SigHandler *)SIG_IGN); | |
676 | ||
677 | else if (sigmodes[SIGINT] & SIG_IGNORED) | |
ccc6cda3 JA |
678 | return ((SigHandler *)set_signal_handler (SIGINT, SIG_IGN)); /* XXX */ |
679 | ||
726f6388 JA |
680 | else if (sigmodes[SIGINT] & SIG_TRAPPED) |
681 | return ((SigHandler *)set_signal_handler (SIGINT, trap_handler)); | |
682 | ||
683 | /* The signal is not trapped, so set the handler to the shell's special | |
684 | interrupt handler. */ | |
685 | else if (interactive) /* XXX - was interactive_shell */ | |
686 | return (set_signal_handler (SIGINT, sigint_sighandler)); | |
687 | else | |
0628567a | 688 | return (set_signal_handler (SIGINT, termsig_sighandler)); |
726f6388 JA |
689 | } |
690 | ||
e8ce775d JA |
691 | /* Return the correct handler for signal SIG according to the values in |
692 | sigmodes[SIG]. */ | |
693 | SigHandler * | |
694 | trap_to_sighandler (sig) | |
695 | int sig; | |
696 | { | |
697 | if (sigmodes[sig] & (SIG_IGNORED|SIG_HARD_IGNORE)) | |
698 | return (SIG_IGN); | |
699 | else if (sigmodes[sig] & SIG_TRAPPED) | |
700 | return (trap_handler); | |
701 | else | |
702 | return (SIG_DFL); | |
703 | } | |
704 | ||
726f6388 JA |
705 | /* Set SIG to call STRING as a command. */ |
706 | void | |
707 | set_signal (sig, string) | |
708 | int sig; | |
709 | char *string; | |
710 | { | |
ac50fbac CR |
711 | sigset_t set, oset; |
712 | ||
f73dda09 | 713 | if (SPECIAL_TRAP (sig)) |
ccc6cda3 JA |
714 | { |
715 | change_signal (sig, savestring (string)); | |
d166f048 JA |
716 | if (sig == EXIT_TRAP && interactive == 0) |
717 | initialize_terminating_signals (); | |
ccc6cda3 JA |
718 | return; |
719 | } | |
720 | ||
726f6388 JA |
721 | /* A signal ignored on entry to the shell cannot be trapped or reset, but |
722 | no error is reported when attempting to do so. -- Posix.2 */ | |
723 | if (sigmodes[sig] & SIG_HARD_IGNORE) | |
724 | return; | |
725 | ||
726 | /* Make sure we have original_signals[sig] if the signal has not yet | |
727 | been trapped. */ | |
728 | if ((sigmodes[sig] & SIG_TRAPPED) == 0) | |
729 | { | |
730 | /* If we aren't sure of the original value, check it. */ | |
731 | if (original_signals[sig] == IMPOSSIBLE_TRAP_HANDLER) | |
0628567a | 732 | GETORIGSIG (sig); |
726f6388 | 733 | if (original_signals[sig] == SIG_IGN) |
0628567a | 734 | return; |
726f6388 JA |
735 | } |
736 | ||
737 | /* Only change the system signal handler if SIG_NO_TRAP is not set. | |
738 | The trap command string is changed in either case. The shell signal | |
739 | handlers for SIGINT and SIGCHLD run the user specified traps in an | |
740 | environment in which it is safe to do so. */ | |
741 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) | |
742 | { | |
ac50fbac | 743 | BLOCK_SIGNAL (sig, set, oset); |
726f6388 JA |
744 | change_signal (sig, savestring (string)); |
745 | set_signal_handler (sig, trap_handler); | |
ac50fbac | 746 | UNBLOCK_SIGNAL (oset); |
726f6388 JA |
747 | } |
748 | else | |
749 | change_signal (sig, savestring (string)); | |
750 | } | |
751 | ||
752 | static void | |
753 | free_trap_command (sig) | |
754 | int sig; | |
755 | { | |
756 | if ((sigmodes[sig] & SIG_TRAPPED) && trap_list[sig] && | |
757 | (trap_list[sig] != (char *)IGNORE_SIG) && | |
758 | (trap_list[sig] != (char *)DEFAULT_SIG) && | |
759 | (trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER)) | |
760 | free (trap_list[sig]); | |
761 | } | |
ccc6cda3 | 762 | |
726f6388 JA |
763 | /* If SIG has a string assigned to it, get rid of it. Then give it |
764 | VALUE. */ | |
765 | static void | |
766 | change_signal (sig, value) | |
767 | int sig; | |
768 | char *value; | |
769 | { | |
d166f048 JA |
770 | if ((sigmodes[sig] & SIG_INPROGRESS) == 0) |
771 | free_trap_command (sig); | |
726f6388 JA |
772 | trap_list[sig] = value; |
773 | ||
774 | sigmodes[sig] |= SIG_TRAPPED; | |
775 | if (value == (char *)IGNORE_SIG) | |
776 | sigmodes[sig] |= SIG_IGNORED; | |
777 | else | |
778 | sigmodes[sig] &= ~SIG_IGNORED; | |
779 | if (sigmodes[sig] & SIG_INPROGRESS) | |
780 | sigmodes[sig] |= SIG_CHANGED; | |
781 | } | |
782 | ||
ac50fbac | 783 | void |
726f6388 JA |
784 | get_original_signal (sig) |
785 | int sig; | |
786 | { | |
787 | /* If we aren't sure the of the original value, then get it. */ | |
0001803f | 788 | if (sig > 0 && sig < NSIG && original_signals[sig] == (SigHandler *)IMPOSSIBLE_TRAP_HANDLER) |
0628567a | 789 | GETORIGSIG (sig); |
726f6388 JA |
790 | } |
791 | ||
495aee44 CR |
792 | void |
793 | get_all_original_signals () | |
794 | { | |
795 | register int i; | |
796 | ||
797 | for (i = 1; i < NSIG; i++) | |
798 | GET_ORIGINAL_SIGNAL (i); | |
799 | } | |
800 | ||
801 | void | |
802 | set_original_signal (sig, handler) | |
803 | int sig; | |
804 | SigHandler *handler; | |
805 | { | |
806 | if (sig > 0 && sig < NSIG && original_signals[sig] == (SigHandler *)IMPOSSIBLE_TRAP_HANDLER) | |
807 | SETORIGSIG (sig, handler); | |
808 | } | |
809 | ||
726f6388 JA |
810 | /* Restore the default action for SIG; i.e., the action the shell |
811 | would have taken before you used the trap command. This is called | |
812 | from trap_builtin (), which takes care to restore the handlers for | |
813 | the signals the shell treats specially. */ | |
814 | void | |
815 | restore_default_signal (sig) | |
816 | int sig; | |
817 | { | |
f73dda09 | 818 | if (SPECIAL_TRAP (sig)) |
726f6388 | 819 | { |
b80f6443 JA |
820 | if ((sig != DEBUG_TRAP && sig != ERROR_TRAP && sig != RETURN_TRAP) || |
821 | (sigmodes[sig] & SIG_INPROGRESS) == 0) | |
d166f048 | 822 | free_trap_command (sig); |
726f6388 JA |
823 | trap_list[sig] = (char *)NULL; |
824 | sigmodes[sig] &= ~SIG_TRAPPED; | |
d166f048 JA |
825 | if (sigmodes[sig] & SIG_INPROGRESS) |
826 | sigmodes[sig] |= SIG_CHANGED; | |
726f6388 JA |
827 | return; |
828 | } | |
829 | ||
830 | GET_ORIGINAL_SIGNAL (sig); | |
831 | ||
832 | /* A signal ignored on entry to the shell cannot be trapped or reset, but | |
833 | no error is reported when attempting to do so. Thanks Posix.2. */ | |
834 | if (sigmodes[sig] & SIG_HARD_IGNORE) | |
835 | return; | |
836 | ||
837 | /* If we aren't trapping this signal, don't bother doing anything else. */ | |
ac50fbac CR |
838 | /* We special-case SIGCHLD and IMPOSSIBLE_TRAP_HANDLER (see above) as a |
839 | sentinel to determine whether or not disposition is reset to the default | |
840 | while the trap handler is executing. */ | |
841 | if (((sigmodes[sig] & SIG_TRAPPED) == 0) && | |
842 | (sig != SIGCHLD || (sigmodes[sig] & SIG_INPROGRESS) == 0 || trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER)) | |
726f6388 JA |
843 | return; |
844 | ||
845 | /* Only change the signal handler for SIG if it allows it. */ | |
ccc6cda3 | 846 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) |
726f6388 JA |
847 | set_signal_handler (sig, original_signals[sig]); |
848 | ||
849 | /* Change the trap command in either case. */ | |
850 | change_signal (sig, (char *)DEFAULT_SIG); | |
851 | ||
852 | /* Mark the signal as no longer trapped. */ | |
853 | sigmodes[sig] &= ~SIG_TRAPPED; | |
854 | } | |
855 | ||
856 | /* Make this signal be ignored. */ | |
857 | void | |
858 | ignore_signal (sig) | |
859 | int sig; | |
860 | { | |
f73dda09 | 861 | if (SPECIAL_TRAP (sig) && ((sigmodes[sig] & SIG_IGNORED) == 0)) |
ccc6cda3 JA |
862 | { |
863 | change_signal (sig, (char *)IGNORE_SIG); | |
864 | return; | |
865 | } | |
866 | ||
726f6388 JA |
867 | GET_ORIGINAL_SIGNAL (sig); |
868 | ||
869 | /* A signal ignored on entry to the shell cannot be trapped or reset. | |
ccc6cda3 | 870 | No error is reported when the user attempts to do so. */ |
726f6388 JA |
871 | if (sigmodes[sig] & SIG_HARD_IGNORE) |
872 | return; | |
873 | ||
874 | /* If already trapped and ignored, no change necessary. */ | |
ccc6cda3 | 875 | if (sigmodes[sig] & SIG_IGNORED) |
726f6388 JA |
876 | return; |
877 | ||
878 | /* Only change the signal handler for SIG if it allows it. */ | |
ccc6cda3 | 879 | if ((sigmodes[sig] & SIG_NO_TRAP) == 0) |
726f6388 JA |
880 | set_signal_handler (sig, SIG_IGN); |
881 | ||
882 | /* Change the trap command in either case. */ | |
883 | change_signal (sig, (char *)IGNORE_SIG); | |
884 | } | |
885 | ||
886 | /* Handle the calling of "trap 0". The only sticky situation is when | |
887 | the command to be executed includes an "exit". This is why we have | |
888 | to provide our own place for top_level to jump to. */ | |
889 | int | |
890 | run_exit_trap () | |
891 | { | |
ccc6cda3 | 892 | char *trap_command; |
b80f6443 | 893 | int code, function_code, retval; |
495aee44 CR |
894 | #if defined (ARRAY_VARS) |
895 | ARRAY *ps; | |
896 | #endif | |
726f6388 | 897 | |
b80f6443 | 898 | trap_saved_exit_value = last_command_exit_value; |
495aee44 CR |
899 | #if defined (ARRAY_VARS) |
900 | ps = save_pipestatus_array (); | |
901 | #endif | |
b80f6443 | 902 | function_code = 0; |
726f6388 | 903 | |
ccc6cda3 JA |
904 | /* Run the trap only if signal 0 is trapped and not ignored, and we are not |
905 | currently running in the trap handler (call to exit in the list of | |
906 | commands given to trap 0). */ | |
907 | if ((sigmodes[EXIT_TRAP] & SIG_TRAPPED) && | |
908 | (sigmodes[EXIT_TRAP] & (SIG_IGNORED|SIG_INPROGRESS)) == 0) | |
726f6388 | 909 | { |
ccc6cda3 JA |
910 | trap_command = savestring (trap_list[EXIT_TRAP]); |
911 | sigmodes[EXIT_TRAP] &= ~SIG_TRAPPED; | |
912 | sigmodes[EXIT_TRAP] |= SIG_INPROGRESS; | |
726f6388 | 913 | |
b80f6443 JA |
914 | retval = trap_saved_exit_value; |
915 | running_trap = 1; | |
916 | ||
ac50fbac | 917 | code = setjmp_nosigs (top_level); |
726f6388 | 918 | |
b80f6443 JA |
919 | /* If we're in a function, make sure return longjmps come here, too. */ |
920 | if (return_catch_flag) | |
ac50fbac | 921 | function_code = setjmp_nosigs (return_catch); |
b80f6443 JA |
922 | |
923 | if (code == 0 && function_code == 0) | |
cce855bc JA |
924 | { |
925 | reset_parser (); | |
17345e5a | 926 | parse_and_execute (trap_command, "exit trap", SEVAL_NONINT|SEVAL_NOHIST|SEVAL_RESETLINE); |
cce855bc | 927 | } |
b80f6443 JA |
928 | else if (code == ERREXIT) |
929 | retval = last_command_exit_value; | |
726f6388 | 930 | else if (code == EXITPROG) |
b80f6443 JA |
931 | retval = last_command_exit_value; |
932 | else if (function_code != 0) | |
933 | retval = return_catch_value; | |
726f6388 | 934 | else |
b80f6443 JA |
935 | retval = trap_saved_exit_value; |
936 | ||
937 | running_trap = 0; | |
a0c0a00f CR |
938 | #if defined (ARRAY_VARS) |
939 | array_dispose (ps); | |
940 | #endif | |
941 | ||
b80f6443 | 942 | return retval; |
726f6388 JA |
943 | } |
944 | ||
495aee44 CR |
945 | #if defined (ARRAY_VARS) |
946 | restore_pipestatus_array (ps); | |
947 | #endif | |
b80f6443 | 948 | return (trap_saved_exit_value); |
726f6388 JA |
949 | } |
950 | ||
ccc6cda3 JA |
951 | void |
952 | run_trap_cleanup (sig) | |
953 | int sig; | |
954 | { | |
955 | sigmodes[sig] &= ~(SIG_INPROGRESS|SIG_CHANGED); | |
956 | } | |
957 | ||
ac50fbac CR |
958 | #define RECURSIVE_SIG(s) (SPECIAL_TRAP(s) == 0) |
959 | ||
ccc6cda3 | 960 | /* Run a trap command for SIG. SIG is one of the signals the shell treats |
b80f6443 JA |
961 | specially. Returns the exit status of the executed trap command list. */ |
962 | static int | |
ccc6cda3 | 963 | _run_trap_internal (sig, tag) |
726f6388 | 964 | int sig; |
ccc6cda3 | 965 | char *tag; |
726f6388 | 966 | { |
ccc6cda3 | 967 | char *trap_command, *old_trap; |
d233b485 CR |
968 | int trap_exit_value; |
969 | volatile int save_return_catch_flag, function_code, old_int; | |
ac50fbac | 970 | int flags; |
b80f6443 | 971 | procenv_t save_return_catch; |
0001803f | 972 | WORD_LIST *save_subst_varlist; |
a0c0a00f | 973 | HASH_TABLE *save_tempenv; |
ac50fbac | 974 | sh_parser_state_t pstate; |
495aee44 CR |
975 | #if defined (ARRAY_VARS) |
976 | ARRAY *ps; | |
977 | #endif | |
ccc6cda3 | 978 | |
b80f6443 | 979 | trap_exit_value = function_code = 0; |
a0c0a00f | 980 | trap_saved_exit_value = last_command_exit_value; |
ccc6cda3 JA |
981 | /* Run the trap only if SIG is trapped and not ignored, and we are not |
982 | currently executing in the trap handler. */ | |
983 | if ((sigmodes[sig] & SIG_TRAPPED) && ((sigmodes[sig] & SIG_IGNORED) == 0) && | |
984 | (trap_list[sig] != (char *)IMPOSSIBLE_TRAP_HANDLER) && | |
ac50fbac CR |
985 | #if 0 |
986 | /* Uncomment this to allow some special signals to recursively execute | |
987 | trap handlers. */ | |
988 | (RECURSIVE_SIG (sig) || (sigmodes[sig] & SIG_INPROGRESS) == 0)) | |
989 | #else | |
ccc6cda3 | 990 | ((sigmodes[sig] & SIG_INPROGRESS) == 0)) |
ac50fbac | 991 | #endif |
ccc6cda3 JA |
992 | { |
993 | old_trap = trap_list[sig]; | |
994 | sigmodes[sig] |= SIG_INPROGRESS; | |
995 | sigmodes[sig] &= ~SIG_CHANGED; /* just to be sure */ | |
996 | trap_command = savestring (old_trap); | |
997 | ||
998 | running_trap = sig + 1; | |
ac50fbac | 999 | |
a0c0a00f CR |
1000 | old_int = interrupt_state; /* temporarily suppress pending interrupts */ |
1001 | CLRINTERRUPT; | |
1002 | ||
495aee44 CR |
1003 | #if defined (ARRAY_VARS) |
1004 | ps = save_pipestatus_array (); | |
1005 | #endif | |
bb70624e | 1006 | |
ac50fbac | 1007 | save_parser_state (&pstate); |
0001803f CR |
1008 | save_subst_varlist = subst_assign_varlist; |
1009 | subst_assign_varlist = 0; | |
a0c0a00f CR |
1010 | save_tempenv = temporary_env; |
1011 | temporary_env = 0; /* traps should not run with temporary env */ | |
b80f6443 | 1012 | |
ac50fbac | 1013 | #if defined (JOB_CONTROL) |
7f89f4cd CR |
1014 | if (sig != DEBUG_TRAP) /* run_debug_trap does this */ |
1015 | save_pipeline (1); /* XXX only provides one save level */ | |
ac50fbac CR |
1016 | #endif |
1017 | ||
b80f6443 JA |
1018 | /* If we're in a function, make sure return longjmps come here, too. */ |
1019 | save_return_catch_flag = return_catch_flag; | |
1020 | if (return_catch_flag) | |
1021 | { | |
1022 | COPY_PROCENV (return_catch, save_return_catch); | |
ac50fbac | 1023 | function_code = setjmp_nosigs (return_catch); |
b80f6443 JA |
1024 | } |
1025 | ||
17345e5a | 1026 | flags = SEVAL_NONINT|SEVAL_NOHIST; |
89a92869 | 1027 | if (sig != DEBUG_TRAP && sig != RETURN_TRAP && sig != ERROR_TRAP) |
17345e5a | 1028 | flags |= SEVAL_RESETLINE; |
d233b485 | 1029 | evalnest++; |
b80f6443 | 1030 | if (function_code == 0) |
a0c0a00f CR |
1031 | { |
1032 | parse_and_execute (trap_command, tag, flags); | |
1033 | trap_exit_value = last_command_exit_value; | |
1034 | } | |
1035 | else | |
1036 | trap_exit_value = return_catch_value; | |
d233b485 | 1037 | evalnest--; |
ac50fbac CR |
1038 | |
1039 | #if defined (JOB_CONTROL) | |
7f89f4cd CR |
1040 | if (sig != DEBUG_TRAP) /* run_debug_trap does this */ |
1041 | restore_pipeline (1); | |
ac50fbac | 1042 | #endif |
bb70624e | 1043 | |
0001803f | 1044 | subst_assign_varlist = save_subst_varlist; |
ac50fbac | 1045 | restore_parser_state (&pstate); |
0001803f | 1046 | |
495aee44 CR |
1047 | #if defined (ARRAY_VARS) |
1048 | restore_pipestatus_array (ps); | |
1049 | #endif | |
a0c0a00f CR |
1050 | |
1051 | temporary_env = save_tempenv; | |
ccc6cda3 JA |
1052 | |
1053 | sigmodes[sig] &= ~SIG_INPROGRESS; | |
a0c0a00f CR |
1054 | running_trap = 0; |
1055 | interrupt_state = old_int; | |
ccc6cda3 JA |
1056 | |
1057 | if (sigmodes[sig] & SIG_CHANGED) | |
1058 | { | |
b80f6443 JA |
1059 | #if 0 |
1060 | /* Special traps like EXIT, DEBUG, RETURN are handled explicitly in | |
1061 | the places where they can be changed using unwind-protects. For | |
1062 | example, look at execute_cmd.c:execute_function(). */ | |
1063 | if (SPECIAL_TRAP (sig) == 0) | |
1064 | #endif | |
1065 | free (old_trap); | |
ccc6cda3 | 1066 | sigmodes[sig] &= ~SIG_CHANGED; |
d233b485 CR |
1067 | |
1068 | CHECK_TERMSIG; /* some pathological conditions lead here */ | |
ccc6cda3 | 1069 | } |
b80f6443 JA |
1070 | |
1071 | if (save_return_catch_flag) | |
1072 | { | |
1073 | return_catch_flag = save_return_catch_flag; | |
1074 | return_catch_value = trap_exit_value; | |
1075 | COPY_PROCENV (save_return_catch, return_catch); | |
1076 | if (function_code) | |
a0c0a00f CR |
1077 | { |
1078 | #if 0 | |
1079 | from_return_trap = sig == RETURN_TRAP; | |
1080 | #endif | |
1081 | sh_longjmp (return_catch, 1); | |
1082 | } | |
b80f6443 | 1083 | } |
ccc6cda3 | 1084 | } |
b80f6443 JA |
1085 | |
1086 | return trap_exit_value; | |
ccc6cda3 JA |
1087 | } |
1088 | ||
b80f6443 | 1089 | int |
ccc6cda3 JA |
1090 | run_debug_trap () |
1091 | { | |
d233b485 | 1092 | int trap_exit_value, old_verbose; |
89a92869 | 1093 | pid_t save_pgrp; |
d233b485 | 1094 | #if defined (PGRP_PIPE) |
89a92869 | 1095 | int save_pipe[2]; |
d233b485 | 1096 | #endif |
b80f6443 JA |
1097 | |
1098 | /* XXX - question: should the DEBUG trap inherit the RETURN trap? */ | |
1099 | trap_exit_value = 0; | |
1100 | if ((sigmodes[DEBUG_TRAP] & SIG_TRAPPED) && ((sigmodes[DEBUG_TRAP] & SIG_IGNORED) == 0) && ((sigmodes[DEBUG_TRAP] & SIG_INPROGRESS) == 0)) | |
1101 | { | |
89a92869 CR |
1102 | #if defined (JOB_CONTROL) |
1103 | save_pgrp = pipeline_pgrp; | |
1104 | pipeline_pgrp = 0; | |
1105 | save_pipeline (1); | |
1106 | # if defined (PGRP_PIPE) | |
1107 | save_pgrp_pipe (save_pipe, 1); | |
1108 | # endif | |
1109 | stop_making_children (); | |
1110 | #endif | |
1111 | ||
d233b485 CR |
1112 | old_verbose = echo_input_at_read; |
1113 | #if 0 /* not yet */ | |
1114 | echo_input_at_read = 0; | |
1115 | #endif | |
1116 | ||
b80f6443 | 1117 | trap_exit_value = _run_trap_internal (DEBUG_TRAP, "debug trap"); |
89a92869 | 1118 | |
d233b485 CR |
1119 | echo_input_at_read = old_verbose; |
1120 | ||
89a92869 CR |
1121 | #if defined (JOB_CONTROL) |
1122 | pipeline_pgrp = save_pgrp; | |
1123 | restore_pipeline (1); | |
1124 | # if defined (PGRP_PIPE) | |
1125 | close_pgrp_pipe (); | |
1126 | restore_pgrp_pipe (save_pipe); | |
1127 | # endif | |
d233b485 | 1128 | if (pipeline_pgrp > 0 && ((subshell_environment & (SUBSHELL_ASYNC|SUBSHELL_PIPE)) == 0)) |
89a92869 | 1129 | give_terminal_to (pipeline_pgrp, 1); |
d233b485 | 1130 | |
89a92869 CR |
1131 | notify_and_cleanup (); |
1132 | #endif | |
b80f6443 JA |
1133 | |
1134 | #if defined (DEBUGGER) | |
1135 | /* If we're in the debugger and the DEBUG trap returns 2 while we're in | |
1136 | a function or sourced script, we force a `return'. */ | |
1137 | if (debugging_mode && trap_exit_value == 2 && return_catch_flag) | |
1138 | { | |
1139 | return_catch_value = trap_exit_value; | |
a0c0a00f | 1140 | sh_longjmp (return_catch, 1); |
b80f6443 JA |
1141 | } |
1142 | #endif | |
1143 | } | |
1144 | return trap_exit_value; | |
ccc6cda3 JA |
1145 | } |
1146 | ||
f73dda09 JA |
1147 | void |
1148 | run_error_trap () | |
1149 | { | |
b80f6443 | 1150 | if ((sigmodes[ERROR_TRAP] & SIG_TRAPPED) && ((sigmodes[ERROR_TRAP] & SIG_IGNORED) == 0) && (sigmodes[ERROR_TRAP] & SIG_INPROGRESS) == 0) |
f73dda09 JA |
1151 | _run_trap_internal (ERROR_TRAP, "error trap"); |
1152 | } | |
1153 | ||
b80f6443 JA |
1154 | void |
1155 | run_return_trap () | |
1156 | { | |
1157 | int old_exit_value; | |
1158 | ||
95732b49 JA |
1159 | #if 0 |
1160 | if ((sigmodes[DEBUG_TRAP] & SIG_TRAPPED) && (sigmodes[DEBUG_TRAP] & SIG_INPROGRESS)) | |
1161 | return; | |
1162 | #endif | |
1163 | ||
b80f6443 JA |
1164 | if ((sigmodes[RETURN_TRAP] & SIG_TRAPPED) && ((sigmodes[RETURN_TRAP] & SIG_IGNORED) == 0) && (sigmodes[RETURN_TRAP] & SIG_INPROGRESS) == 0) |
1165 | { | |
1166 | old_exit_value = last_command_exit_value; | |
1167 | _run_trap_internal (RETURN_TRAP, "return trap"); | |
1168 | last_command_exit_value = old_exit_value; | |
1169 | } | |
1170 | } | |
1171 | ||
ccc6cda3 JA |
1172 | /* Run a trap set on SIGINT. This is called from throw_to_top_level (), and |
1173 | declared here to localize the trap functions. */ | |
1174 | void | |
a0c0a00f CR |
1175 | run_interrupt_trap (will_throw) |
1176 | int will_throw; /* from throw_to_top_level? */ | |
ccc6cda3 | 1177 | { |
a0c0a00f CR |
1178 | if (will_throw && running_trap > 0) |
1179 | run_trap_cleanup (running_trap - 1); | |
ccc6cda3 | 1180 | _run_trap_internal (SIGINT, "interrupt trap"); |
726f6388 JA |
1181 | } |
1182 | ||
1183 | /* Free all the allocated strings in the list of traps and reset the trap | |
0001803f CR |
1184 | values to the default. Intended to be called from subshells that want |
1185 | to complete work done by reset_signal_handlers upon execution of a | |
ac50fbac CR |
1186 | subsequent `trap' command that changes a signal's disposition. We need |
1187 | to make sure that we duplicate the behavior of | |
1188 | reset_or_restore_signal_handlers and not change the disposition of signals | |
1189 | that are set to be ignored. */ | |
726f6388 JA |
1190 | void |
1191 | free_trap_strings () | |
1192 | { | |
1193 | register int i; | |
1194 | ||
a0c0a00f | 1195 | for (i = 0; i < NSIG; i++) |
ac50fbac CR |
1196 | { |
1197 | if (trap_list[i] != (char *)IGNORE_SIG) | |
1198 | free_trap_string (i); | |
1199 | } | |
a0c0a00f CR |
1200 | for (i = NSIG; i < BASH_NSIG; i++) |
1201 | { | |
1202 | /* Don't free the trap string if the subshell inherited the trap */ | |
1203 | if ((sigmodes[i] & SIG_TRAPPED) == 0) | |
1204 | { | |
1205 | free_trap_string (i); | |
1206 | trap_list[i] = (char *)NULL; | |
1207 | } | |
1208 | } | |
726f6388 | 1209 | } |
0001803f CR |
1210 | |
1211 | /* Free a trap command string associated with SIG without changing signal | |
1212 | disposition. Intended to be called from free_trap_strings() */ | |
1213 | static void | |
1214 | free_trap_string (sig) | |
1215 | int sig; | |
1216 | { | |
1217 | change_signal (sig, (char *)DEFAULT_SIG); | |
d233b485 | 1218 | sigmodes[sig] &= ~SIG_TRAPPED; /* XXX - SIG_INPROGRESS? */ |
0001803f | 1219 | } |
726f6388 | 1220 | |
495aee44 CR |
1221 | /* Reset the handler for SIG to the original value but leave the trap string |
1222 | in place. */ | |
726f6388 JA |
1223 | static void |
1224 | reset_signal (sig) | |
1225 | int sig; | |
1226 | { | |
1227 | set_signal_handler (sig, original_signals[sig]); | |
d233b485 | 1228 | sigmodes[sig] &= ~SIG_TRAPPED; /* XXX - SIG_INPROGRESS? */ |
726f6388 JA |
1229 | } |
1230 | ||
ccc6cda3 JA |
1231 | /* Set the handler signal SIG to the original and free any trap |
1232 | command associated with it. */ | |
1233 | static void | |
1234 | restore_signal (sig) | |
1235 | int sig; | |
726f6388 | 1236 | { |
ccc6cda3 JA |
1237 | set_signal_handler (sig, original_signals[sig]); |
1238 | change_signal (sig, (char *)DEFAULT_SIG); | |
1239 | sigmodes[sig] &= ~SIG_TRAPPED; | |
726f6388 JA |
1240 | } |
1241 | ||
ccc6cda3 JA |
1242 | static void |
1243 | reset_or_restore_signal_handlers (reset) | |
f73dda09 | 1244 | sh_resetsig_func_t *reset; |
726f6388 JA |
1245 | { |
1246 | register int i; | |
1247 | ||
ccc6cda3 JA |
1248 | /* Take care of the exit trap first */ |
1249 | if (sigmodes[EXIT_TRAP] & SIG_TRAPPED) | |
726f6388 | 1250 | { |
d233b485 | 1251 | sigmodes[EXIT_TRAP] &= ~SIG_TRAPPED; /* XXX - SIG_INPROGRESS? */ |
95732b49 JA |
1252 | if (reset != reset_signal) |
1253 | { | |
1254 | free_trap_command (EXIT_TRAP); | |
1255 | trap_list[EXIT_TRAP] = (char *)NULL; | |
1256 | } | |
726f6388 | 1257 | } |
b80f6443 | 1258 | |
726f6388 JA |
1259 | for (i = 1; i < NSIG; i++) |
1260 | { | |
ccc6cda3 | 1261 | if (sigmodes[i] & SIG_TRAPPED) |
726f6388 JA |
1262 | { |
1263 | if (trap_list[i] == (char *)IGNORE_SIG) | |
1264 | set_signal_handler (i, SIG_IGN); | |
1265 | else | |
ccc6cda3 | 1266 | (*reset) (i); |
726f6388 | 1267 | } |
ccc6cda3 JA |
1268 | else if (sigmodes[i] & SIG_SPECIAL) |
1269 | (*reset) (i); | |
a0c0a00f | 1270 | pending_traps[i] = 0; /* XXX */ |
726f6388 | 1271 | } |
f73dda09 JA |
1272 | |
1273 | /* Command substitution and other child processes don't inherit the | |
b80f6443 JA |
1274 | debug, error, or return traps. If we're in the debugger, and the |
1275 | `functrace' or `errtrace' options have been set, then let command | |
1276 | substitutions inherit them. Let command substitution inherit the | |
1277 | RETURN trap if we're in the debugger and tracing functions. */ | |
0628567a JA |
1278 | if (function_trace_mode == 0) |
1279 | { | |
1280 | sigmodes[DEBUG_TRAP] &= ~SIG_TRAPPED; | |
1281 | sigmodes[RETURN_TRAP] &= ~SIG_TRAPPED; | |
1282 | } | |
1283 | if (error_trace_mode == 0) | |
b80f6443 | 1284 | sigmodes[ERROR_TRAP] &= ~SIG_TRAPPED; |
726f6388 JA |
1285 | } |
1286 | ||
f73dda09 | 1287 | /* Reset trapped signals to their original values, but don't free the |
495aee44 CR |
1288 | trap strings. Called by the command substitution code and other places |
1289 | that create a "subshell environment". */ | |
726f6388 | 1290 | void |
ccc6cda3 | 1291 | reset_signal_handlers () |
726f6388 | 1292 | { |
ccc6cda3 JA |
1293 | reset_or_restore_signal_handlers (reset_signal); |
1294 | } | |
726f6388 | 1295 | |
ccc6cda3 JA |
1296 | /* Reset all trapped signals to their original values. Signals set to be |
1297 | ignored with trap '' SIGNAL should be ignored, so we make sure that they | |
1298 | are. Called by child processes after they are forked. */ | |
1299 | void | |
1300 | restore_original_signals () | |
1301 | { | |
1302 | reset_or_restore_signal_handlers (restore_signal); | |
726f6388 JA |
1303 | } |
1304 | ||
1305 | /* If a trap handler exists for signal SIG, then call it; otherwise just | |
ac50fbac | 1306 | return failure. Returns 1 if it called the trap handler. */ |
726f6388 JA |
1307 | int |
1308 | maybe_call_trap_handler (sig) | |
1309 | int sig; | |
1310 | { | |
1311 | /* Call the trap handler for SIG if the signal is trapped and not ignored. */ | |
ccc6cda3 | 1312 | if ((sigmodes[sig] & SIG_TRAPPED) && ((sigmodes[sig] & SIG_IGNORED) == 0)) |
726f6388 JA |
1313 | { |
1314 | switch (sig) | |
1315 | { | |
1316 | case SIGINT: | |
a0c0a00f | 1317 | run_interrupt_trap (0); |
726f6388 | 1318 | break; |
ccc6cda3 | 1319 | case EXIT_TRAP: |
726f6388 JA |
1320 | run_exit_trap (); |
1321 | break; | |
ccc6cda3 JA |
1322 | case DEBUG_TRAP: |
1323 | run_debug_trap (); | |
1324 | break; | |
f73dda09 JA |
1325 | case ERROR_TRAP: |
1326 | run_error_trap (); | |
1327 | break; | |
726f6388 JA |
1328 | default: |
1329 | trap_handler (sig); | |
1330 | break; | |
1331 | } | |
1332 | return (1); | |
1333 | } | |
1334 | else | |
1335 | return (0); | |
1336 | } | |
1337 | ||
1338 | int | |
1339 | signal_is_trapped (sig) | |
1340 | int sig; | |
1341 | { | |
1342 | return (sigmodes[sig] & SIG_TRAPPED); | |
1343 | } | |
1344 | ||
ac50fbac CR |
1345 | int |
1346 | signal_is_pending (sig) | |
1347 | int sig; | |
1348 | { | |
1349 | return (pending_traps[sig]); | |
1350 | } | |
1351 | ||
726f6388 JA |
1352 | int |
1353 | signal_is_special (sig) | |
1354 | int sig; | |
1355 | { | |
1356 | return (sigmodes[sig] & SIG_SPECIAL); | |
1357 | } | |
1358 | ||
1359 | int | |
1360 | signal_is_ignored (sig) | |
1361 | int sig; | |
1362 | { | |
1363 | return (sigmodes[sig] & SIG_IGNORED); | |
1364 | } | |
1365 | ||
495aee44 CR |
1366 | int |
1367 | signal_is_hard_ignored (sig) | |
1368 | int sig; | |
1369 | { | |
1370 | return (sigmodes[sig] & SIG_HARD_IGNORE); | |
1371 | } | |
1372 | ||
726f6388 | 1373 | void |
ac50fbac | 1374 | set_signal_hard_ignored (sig) |
726f6388 JA |
1375 | int sig; |
1376 | { | |
1377 | sigmodes[sig] |= SIG_HARD_IGNORE; | |
ccc6cda3 | 1378 | original_signals[sig] = SIG_IGN; |
726f6388 | 1379 | } |
95732b49 | 1380 | |
ac50fbac CR |
1381 | void |
1382 | set_signal_ignored (sig) | |
1383 | int sig; | |
1384 | { | |
1385 | original_signals[sig] = SIG_IGN; | |
1386 | } | |
1387 | ||
95732b49 JA |
1388 | int |
1389 | signal_in_progress (sig) | |
1390 | int sig; | |
1391 | { | |
1392 | return (sigmodes[sig] & SIG_INPROGRESS); | |
1393 | } |