Commit | Line | Data |
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84fbe20b | 1 | /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc. |
adb2c53b | 2 | * |
0f2d19dd JB |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
adb2c53b | 7 | * |
0f2d19dd JB |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
adb2c53b | 12 | * |
0f2d19dd JB |
13 | * You should have received a copy of the GNU General Public License |
14 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
0f2d19dd JB |
45 | \f |
46 | ||
0f2d19dd | 47 | #include <signal.h> |
a0599745 | 48 | #include "libguile/_scm.h" |
0f2d19dd | 49 | |
a0599745 MD |
50 | #include "libguile/async.h" |
51 | #include "libguile/eval.h" | |
52 | #include "libguile/vectors.h" | |
1bbd0b84 | 53 | |
a0599745 MD |
54 | #include "libguile/validate.h" |
55 | #include "libguile/scmsigs.h" | |
20e6290e | 56 | |
0f2d19dd JB |
57 | #ifdef HAVE_UNISTD_H |
58 | #include <unistd.h> | |
59 | #endif | |
60 | ||
b74f4728 JB |
61 | /* The thread system has its own sleep and usleep functions. */ |
62 | #ifndef USE_THREADS | |
63 | ||
64 | #if defined(MISSING_SLEEP_DECL) | |
65 | int sleep (); | |
66 | #endif | |
67 | ||
68 | #if defined(HAVE_USLEEP) && defined(MISSING_USLEEP_DECL) | |
69 | int usleep (); | |
ce874f2d | 70 | #endif |
b74f4728 | 71 | |
0935d604 | 72 | #endif |
0f2d19dd JB |
73 | |
74 | \f | |
75 | ||
e1a191a8 | 76 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
77 | |
78 | #ifdef RETSIGTYPE | |
e1a191a8 | 79 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 80 | #else |
e1a191a8 GH |
81 | # ifdef STDC_HEADERS |
82 | # define SIGRETTYPE void | |
83 | # else | |
84 | # define SIGRETTYPE int | |
85 | # endif | |
0f2d19dd JB |
86 | #endif |
87 | ||
88 | \f | |
89 | ||
e1a191a8 GH |
90 | /* take_signal is installed as the C signal handler whenever a Scheme |
91 | handler is set. when a signal arrives, take_signal marks the corresponding | |
92 | element of got_signal and marks signal_async. the thunk in signal_async | |
93 | (sys_deliver_signals) will be run at the next opportunity, outside a | |
94 | critical section. sys_deliver_signals runs each Scheme handler for | |
95 | which got_signal is set. */ | |
0f2d19dd | 96 | |
e1a191a8 | 97 | static SCM signal_async; |
0f2d19dd | 98 | |
e1a191a8 | 99 | static char got_signal[NSIG]; |
0f2d19dd | 100 | |
e1a191a8 GH |
101 | /* a Scheme vector of handler procedures. */ |
102 | static SCM *signal_handlers; | |
0f2d19dd | 103 | |
e1a191a8 GH |
104 | /* saves the original C handlers, when a new handler is installed. |
105 | set to SIG_ERR if the original handler is installed. */ | |
106 | #ifdef HAVE_SIGACTION | |
107 | static struct sigaction orig_handlers[NSIG]; | |
108 | #else | |
da6e81b6 | 109 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
110 | #endif |
111 | ||
e1a191a8 GH |
112 | static SIGRETTYPE |
113 | take_signal (int signum) | |
114 | { | |
ee149d03 | 115 | int saved_errno = errno; |
e1a191a8 | 116 | SCM ignored; |
0f781bf6 | 117 | |
e1a191a8 GH |
118 | if (!scm_ints_disabled) |
119 | { | |
120 | /* For reasons of speed, the SCM_NEWCELL macro doesn't defer | |
121 | interrupts. Instead, it first sets its argument to point to | |
122 | the first cell in the list, and then advances the freelist | |
123 | pointer to the next cell. Now, if this procedure is | |
124 | interrupted, the only anomalous state possible is to have | |
125 | both SCM_NEWCELL's argument and scm_freelist pointing to the | |
126 | same cell. To deal with this case, we always throw away the | |
127 | first cell in scm_freelist here. | |
128 | ||
129 | At least, that's the theory. I'm not convinced that that's | |
130 | the only anomalous path we need to worry about. */ | |
131 | SCM_NEWCELL (ignored); | |
132 | } | |
133 | got_signal[signum] = 1; | |
134 | #if HAVE_SIGACTION | |
135 | /* unblock the signal before the scheme handler gets to run, since | |
136 | it may use longjmp to escape (i.e., throw an exception). */ | |
137 | { | |
138 | sigset_t set; | |
139 | sigemptyset (&set); | |
140 | sigaddset (&set, signum); | |
141 | sigprocmask (SIG_UNBLOCK, &set, NULL); | |
142 | } | |
143 | #endif | |
144 | scm_system_async_mark (signal_async); | |
ee149d03 | 145 | errno = saved_errno; |
e1a191a8 | 146 | } |
0f2d19dd | 147 | |
e1a191a8 GH |
148 | static SCM |
149 | sys_deliver_signals (void) | |
150 | { | |
151 | int i; | |
152 | ||
153 | for (i = 0; i < NSIG; i++) | |
154 | { | |
155 | if (got_signal[i]) | |
156 | { | |
cc0b3312 GH |
157 | /* The flag is reset before calling the handler in case the |
158 | handler doesn't return. If the handler doesn't return | |
159 | but leaves other signals flagged, they their handlers | |
160 | will be applied some time later when the async is checked | |
161 | again. It would probably be better to reset the flags | |
162 | after doing a longjmp. */ | |
e1a191a8 GH |
163 | got_signal[i] = 0; |
164 | #ifndef HAVE_SIGACTION | |
165 | signal (i, take_signal); | |
166 | #endif | |
adb2c53b | 167 | scm_apply (SCM_VELTS (*signal_handlers)[i], |
2ad6b1a5 GH |
168 | scm_listify (SCM_MAKINUM (i), SCM_UNDEFINED), |
169 | SCM_EOL); | |
e1a191a8 GH |
170 | } |
171 | } | |
172 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
173 | } |
174 | ||
e1a191a8 | 175 | /* user interface for installation of signal handlers. */ |
adb2c53b | 176 | SCM_DEFINE (scm_sigaction, "sigaction", 1, 2, 0, |
1bbd0b84 | 177 | (SCM signum, SCM handler, SCM flags), |
0d172d3f | 178 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
179 | "@var{signum} is the signal number, which can be specified using the value\n" |
180 | "of variables such as @code{SIGINT}.\n\n" | |
181 | "If @var{action} is omitted, @code{sigaction} returns a pair: the\n" | |
182 | "CAR is the current\n" | |
183 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
184 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
185 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
186 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
187 | "If @var{action} is provided, it is installed as the new handler for\n" | |
188 | "@var{signum}. @var{action} can be a Scheme procedure taking one\n" | |
189 | "argument, or the value of @code{SIG_DFL} (default action) or\n" | |
190 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
191 | "was installed before @code{sigaction} was first used. Flags can\n" | |
192 | "optionally be specified for the new handler (@code{SA_RESTART} will\n" | |
0d172d3f | 193 | "always be added if it's available and the system is using restartable\n" |
b380b885 MD |
194 | "system calls.) The return value is a pair with information about the\n" |
195 | "old handler as described above.\n\n" | |
196 | "This interface does not provide access to the \"signal blocking\"\n" | |
197 | "facility. Maybe this is not needed, since the thread support may\n" | |
198 | "provide solutions to the problem of consistent access to data\n" | |
199 | "structures.") | |
1bbd0b84 | 200 | #define FUNC_NAME s_scm_sigaction |
e1a191a8 GH |
201 | { |
202 | int csig; | |
203 | #ifdef HAVE_SIGACTION | |
204 | struct sigaction action; | |
205 | struct sigaction old_action; | |
206 | #else | |
207 | SIGRETTYPE (* chandler) (int); | |
208 | SIGRETTYPE (* old_chandler) (int); | |
209 | #endif | |
210 | int query_only = 0; | |
211 | int save_handler = 0; | |
212 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
213 | SCM old_handler; | |
214 | ||
3b3b36dd | 215 | SCM_VALIDATE_INUM_COPY (1,signum,csig); |
7ee92fce GH |
216 | #if defined(HAVE_SIGACTION) |
217 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
218 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
219 | is defined, since libguile would be likely to produce spurious | |
220 | EINTR errors. */ | |
e1a191a8 GH |
221 | action.sa_flags = SA_RESTART; |
222 | #else | |
223 | action.sa_flags = 0; | |
224 | #endif | |
225 | if (!SCM_UNBNDP (flags)) | |
226 | { | |
3b3b36dd | 227 | SCM_VALIDATE_INUM (3,flags); |
e1a191a8 GH |
228 | action.sa_flags |= SCM_INUM (flags); |
229 | } | |
230 | sigemptyset (&action.sa_mask); | |
231 | #endif | |
232 | SCM_DEFER_INTS; | |
233 | old_handler = scheme_handlers[csig]; | |
234 | if (SCM_UNBNDP (handler)) | |
235 | query_only = 1; | |
9a09deb1 | 236 | else if (SCM_EQ_P (scm_integer_p (handler), SCM_BOOL_T)) |
e1a191a8 | 237 | { |
1bbd0b84 GB |
238 | if (SCM_NUM2LONG (2,handler) == (long) SIG_DFL |
239 | || SCM_NUM2LONG (2,handler) == (long) SIG_IGN) | |
e1a191a8 GH |
240 | { |
241 | #ifdef HAVE_SIGACTION | |
242 | action.sa_handler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
243 | #else | |
244 | chandler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
245 | #endif | |
246 | scheme_handlers[csig] = SCM_BOOL_F; | |
247 | } | |
248 | else | |
1bbd0b84 | 249 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 GH |
250 | } |
251 | else if (SCM_FALSEP (handler)) | |
252 | { | |
253 | /* restore the default handler. */ | |
254 | #ifdef HAVE_SIGACTION | |
255 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
256 | query_only = 1; | |
257 | else | |
258 | { | |
259 | action = orig_handlers[csig]; | |
260 | orig_handlers[csig].sa_handler = SIG_ERR; | |
261 | scheme_handlers[csig] = SCM_BOOL_F; | |
262 | } | |
263 | #else | |
264 | if (orig_handlers[csig] == SIG_ERR) | |
265 | query_only = 1; | |
266 | else | |
267 | { | |
268 | chandler = orig_handlers[csig]; | |
269 | orig_handlers[csig] = SIG_ERR; | |
270 | scheme_handlers[csig] = SCM_BOOL_F; | |
271 | } | |
272 | #endif | |
adb2c53b | 273 | } |
e1a191a8 GH |
274 | else |
275 | { | |
6b5a304f | 276 | SCM_VALIDATE_NIM (2,handler); |
e1a191a8 GH |
277 | #ifdef HAVE_SIGACTION |
278 | action.sa_handler = take_signal; | |
279 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
280 | save_handler = 1; | |
281 | #else | |
282 | chandler = take_signal; | |
283 | if (orig_handlers[csig] == SIG_ERR) | |
284 | save_handler = 1; | |
285 | #endif | |
286 | scheme_handlers[csig] = handler; | |
287 | } | |
adb2c53b | 288 | |
0d172d3f MV |
289 | /* XXX - Silently ignore setting handlers for `program error signals' |
290 | because they can't currently be handled by Scheme code. | |
291 | */ | |
292 | ||
293 | switch (csig) | |
294 | { | |
295 | /* This list of program error signals is from the GNU Libc | |
296 | Reference Manual */ | |
297 | case SIGFPE: | |
298 | case SIGILL: | |
299 | case SIGSEGV: | |
300 | case SIGBUS: | |
301 | case SIGABRT: | |
6732de1b | 302 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
303 | case SIGIOT: |
304 | #endif | |
305 | case SIGTRAP: | |
306 | #ifdef SIGEMT | |
307 | case SIGEMT: | |
308 | #endif | |
adb2c53b | 309 | #ifdef SIGSYS |
0d172d3f | 310 | case SIGSYS: |
adb2c53b | 311 | #endif |
0d172d3f MV |
312 | query_only = 1; |
313 | } | |
314 | ||
e1a191a8 GH |
315 | #ifdef HAVE_SIGACTION |
316 | if (query_only) | |
317 | { | |
318 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 319 | SCM_SYSERROR; |
e1a191a8 GH |
320 | } |
321 | else | |
322 | { | |
323 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 324 | SCM_SYSERROR; |
e1a191a8 GH |
325 | if (save_handler) |
326 | orig_handlers[csig] = old_action; | |
327 | } | |
328 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 329 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 GH |
330 | SCM_ALLOW_INTS; |
331 | return scm_cons (old_handler, SCM_MAKINUM (old_action.sa_flags)); | |
332 | #else | |
333 | if (query_only) | |
334 | { | |
335 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 336 | SCM_SYSERROR; |
e1a191a8 | 337 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 338 | SCM_SYSERROR; |
e1a191a8 GH |
339 | } |
340 | else | |
341 | { | |
342 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 343 | SCM_SYSERROR; |
e1a191a8 GH |
344 | if (save_handler) |
345 | orig_handlers[csig] = old_chandler; | |
346 | } | |
347 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
da6e81b6 | 348 | old_handler = scm_long2num ((long) old_chandler); |
e1a191a8 GH |
349 | SCM_ALLOW_INTS; |
350 | return scm_cons (old_handler, SCM_MAKINUM (0)); | |
0f2d19dd | 351 | #endif |
e1a191a8 | 352 | } |
1bbd0b84 | 353 | #undef FUNC_NAME |
e1a191a8 | 354 | |
adb2c53b | 355 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 356 | (void), |
b380b885 MD |
357 | "Return all signal handlers to the values they had before any call to\n" |
358 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 359 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
360 | { |
361 | int i; | |
adb2c53b | 362 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); |
e1a191a8 GH |
363 | |
364 | for (i = 0; i < NSIG; i++) | |
365 | { | |
366 | #ifdef HAVE_SIGACTION | |
367 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
368 | { | |
369 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 370 | SCM_SYSERROR; |
e1a191a8 GH |
371 | orig_handlers[i].sa_handler = SIG_ERR; |
372 | scheme_handlers[i] = SCM_BOOL_F; | |
373 | } | |
374 | #else | |
375 | if (orig_handlers[i] != SIG_ERR) | |
376 | { | |
377 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 378 | SCM_SYSERROR; |
e1a191a8 GH |
379 | orig_handlers[i] = SIG_ERR; |
380 | scheme_handlers[i] = SCM_BOOL_F; | |
381 | } | |
382 | #endif | |
383 | } | |
384 | return SCM_UNSPECIFIED; | |
385 | } | |
1bbd0b84 | 386 | #undef FUNC_NAME |
0f2d19dd | 387 | |
adb2c53b | 388 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 389 | (SCM i), |
b380b885 MD |
390 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
391 | "number of seconds (an integer). It's advisable to install a signal\n" | |
392 | "handler for\n" | |
393 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
394 | "the process.\n\n" | |
395 | "The return value indicates the time remaining for the previous alarm,\n" | |
396 | "if any. The new value replaces the previous alarm. If there was\n" | |
397 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 398 | #define FUNC_NAME s_scm_alarm |
0f2d19dd JB |
399 | { |
400 | unsigned int j; | |
3b3b36dd | 401 | SCM_VALIDATE_INUM (1,i); |
e1a191a8 | 402 | j = alarm (SCM_INUM (i)); |
0f2d19dd JB |
403 | return SCM_MAKINUM (j); |
404 | } | |
1bbd0b84 | 405 | #undef FUNC_NAME |
0f2d19dd | 406 | |
0e958795 | 407 | #ifdef HAVE_PAUSE |
adb2c53b | 408 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 409 | (), |
b380b885 MD |
410 | "Pause the current process (thread?) until a signal arrives whose\n" |
411 | "action is to either terminate the current process or invoke a\n" | |
412 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 413 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
414 | { |
415 | pause (); | |
416 | return SCM_UNSPECIFIED; | |
417 | } | |
1bbd0b84 | 418 | #undef FUNC_NAME |
0e958795 | 419 | #endif |
0f2d19dd | 420 | |
adb2c53b | 421 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 422 | (SCM i), |
b380b885 MD |
423 | "Wait for the given number of seconds (an integer) or until a signal\n" |
424 | "arrives. The return value is zero if the time elapses or the number\n" | |
425 | "of seconds remaining otherwise.") | |
1bbd0b84 | 426 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 427 | { |
b74f4728 | 428 | unsigned long j; |
3b3b36dd | 429 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
430 | #ifdef USE_THREADS |
431 | j = scm_thread_sleep (SCM_INUM(i)); | |
432 | #else | |
e1a191a8 | 433 | j = sleep (SCM_INUM(i)); |
b74f4728 JB |
434 | #endif |
435 | return scm_ulong2num (j); | |
0f2d19dd | 436 | } |
1bbd0b84 | 437 | #undef FUNC_NAME |
0f2d19dd | 438 | |
b74f4728 | 439 | #if defined(USE_THREADS) || defined(HAVE_USLEEP) |
adb2c53b | 440 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 441 | (SCM i), |
b450f070 GB |
442 | "Sleep for I microseconds.\n" |
443 | "`usleep' is not available on all platforms.") | |
1bbd0b84 | 444 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 445 | { |
3b3b36dd | 446 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
447 | |
448 | #ifdef USE_THREADS | |
449 | /* If we have threads, we use the thread system's sleep function. */ | |
450 | { | |
451 | unsigned long j = scm_thread_usleep (SCM_INUM (i)); | |
452 | return scm_ulong2num (j); | |
453 | } | |
454 | #else | |
0935d604 MD |
455 | #ifdef USLEEP_RETURNS_VOID |
456 | usleep (SCM_INUM (i)); | |
457 | return SCM_INUM0; | |
458 | #else | |
b74f4728 JB |
459 | { |
460 | int j = usleep (SCM_INUM (i)); | |
461 | return SCM_MAKINUM (j); | |
462 | } | |
0935d604 | 463 | #endif |
ce874f2d | 464 | #endif |
b74f4728 | 465 | } |
1bbd0b84 | 466 | #undef FUNC_NAME |
b74f4728 | 467 | #endif /* GUILE_ISELECT || HAVE_USLEEP */ |
ce874f2d | 468 | |
adb2c53b | 469 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 470 | (SCM sig), |
b380b885 MD |
471 | "\n" |
472 | "Sends a specified signal @var{sig} to the current process, where\n" | |
473 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 474 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 475 | { |
3b3b36dd | 476 | SCM_VALIDATE_INUM (1,sig); |
e1a191a8 GH |
477 | SCM_DEFER_INTS; |
478 | if (kill (getpid (), (int) SCM_INUM (sig)) != 0) | |
1bbd0b84 | 479 | SCM_SYSERROR; |
e1a191a8 GH |
480 | SCM_ALLOW_INTS; |
481 | return SCM_UNSPECIFIED; | |
0f2d19dd | 482 | } |
1bbd0b84 | 483 | #undef FUNC_NAME |
0f2d19dd JB |
484 | |
485 | \f | |
0f2d19dd | 486 | |
e1a191a8 GH |
487 | void |
488 | scm_init_scmsigs () | |
0f2d19dd | 489 | { |
e1a191a8 GH |
490 | SCM thunk; |
491 | int i; | |
492 | ||
493 | signal_handlers = | |
494 | SCM_CDRLOC (scm_sysintern ("signal-handlers", | |
00ffa0e7 | 495 | scm_c_make_vector (NSIG, SCM_BOOL_F))); |
e1a191a8 GH |
496 | thunk = scm_make_gsubr ("%deliver-signals", 0, 0, 0, |
497 | sys_deliver_signals); | |
498 | signal_async = scm_system_async (thunk); | |
499 | ||
500 | for (i = 0; i < NSIG; i++) | |
501 | { | |
502 | got_signal[i] = 0; | |
503 | #ifdef HAVE_SIGACTION | |
504 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 505 | |
e1a191a8 GH |
506 | #else |
507 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 508 | #endif |
840ae05d | 509 | |
08b8c694 | 510 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce | 511 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
adb2c53b | 512 | signals really are restartable. don't rely on the same |
7ee92fce GH |
513 | run-time that configure got: reset the default for every signal. |
514 | */ | |
515 | #ifdef HAVE_SIGINTERRUPT | |
516 | siginterrupt (i, 0); | |
de881428 | 517 | #elif defined(SA_RESTART) |
840ae05d JB |
518 | { |
519 | struct sigaction action; | |
520 | ||
521 | sigaction (i, NULL, &action); | |
522 | if (!(action.sa_flags & SA_RESTART)) | |
523 | { | |
3efb80f2 | 524 | action.sa_flags |= SA_RESTART; |
840ae05d JB |
525 | sigaction (i, &action, NULL); |
526 | } | |
527 | } | |
7ee92fce GH |
528 | #endif |
529 | /* if neither siginterrupt nor SA_RESTART are available we may | |
530 | as well assume that signals are always restartable. */ | |
840ae05d | 531 | #endif |
e1a191a8 | 532 | } |
1cc91f1b | 533 | |
e1a191a8 GH |
534 | scm_sysintern ("NSIG", scm_long2num (NSIG)); |
535 | scm_sysintern ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
536 | scm_sysintern ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
537 | #ifdef SA_NOCLDSTOP | |
538 | scm_sysintern ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); | |
0f2d19dd | 539 | #endif |
e1a191a8 GH |
540 | #ifdef SA_RESTART |
541 | scm_sysintern ("SA_RESTART", scm_long2num (SA_RESTART)); | |
0f2d19dd | 542 | #endif |
1cc91f1b | 543 | |
8dc9439f | 544 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 545 | #include "libguile/scmsigs.x" |
8dc9439f | 546 | #endif |
0f2d19dd JB |
547 | } |
548 | ||
89e00824 ML |
549 | |
550 | /* | |
551 | Local Variables: | |
552 | c-file-style: "gnu" | |
553 | End: | |
554 | */ |