Commit | Line | Data |
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e4b265d8 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 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> |
e6e2e95a MD |
48 | #include <errno.h> |
49 | ||
a0599745 | 50 | #include "libguile/_scm.h" |
0f2d19dd | 51 | |
a0599745 MD |
52 | #include "libguile/async.h" |
53 | #include "libguile/eval.h" | |
54 | #include "libguile/vectors.h" | |
1bbd0b84 | 55 | |
a0599745 MD |
56 | #include "libguile/validate.h" |
57 | #include "libguile/scmsigs.h" | |
20e6290e | 58 | |
0f2d19dd JB |
59 | #ifdef HAVE_UNISTD_H |
60 | #include <unistd.h> | |
61 | #endif | |
62 | ||
b74f4728 JB |
63 | /* The thread system has its own sleep and usleep functions. */ |
64 | #ifndef USE_THREADS | |
65 | ||
66 | #if defined(MISSING_SLEEP_DECL) | |
67 | int sleep (); | |
68 | #endif | |
69 | ||
70 | #if defined(HAVE_USLEEP) && defined(MISSING_USLEEP_DECL) | |
71 | int usleep (); | |
ce874f2d | 72 | #endif |
b74f4728 | 73 | |
0935d604 | 74 | #endif |
0f2d19dd JB |
75 | |
76 | \f | |
77 | ||
e1a191a8 | 78 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
79 | |
80 | #ifdef RETSIGTYPE | |
e1a191a8 | 81 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 82 | #else |
e1a191a8 GH |
83 | # ifdef STDC_HEADERS |
84 | # define SIGRETTYPE void | |
85 | # else | |
86 | # define SIGRETTYPE int | |
87 | # endif | |
0f2d19dd JB |
88 | #endif |
89 | ||
90 | \f | |
91 | ||
e1a191a8 GH |
92 | /* take_signal is installed as the C signal handler whenever a Scheme |
93 | handler is set. when a signal arrives, take_signal marks the corresponding | |
94 | element of got_signal and marks signal_async. the thunk in signal_async | |
95 | (sys_deliver_signals) will be run at the next opportunity, outside a | |
96 | critical section. sys_deliver_signals runs each Scheme handler for | |
97 | which got_signal is set. */ | |
0f2d19dd | 98 | |
e1a191a8 | 99 | static SCM signal_async; |
0f2d19dd | 100 | |
e1a191a8 | 101 | static char got_signal[NSIG]; |
0f2d19dd | 102 | |
e1a191a8 GH |
103 | /* a Scheme vector of handler procedures. */ |
104 | static SCM *signal_handlers; | |
0f2d19dd | 105 | |
e1a191a8 GH |
106 | /* saves the original C handlers, when a new handler is installed. |
107 | set to SIG_ERR if the original handler is installed. */ | |
108 | #ifdef HAVE_SIGACTION | |
109 | static struct sigaction orig_handlers[NSIG]; | |
110 | #else | |
da6e81b6 | 111 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
112 | #endif |
113 | ||
e1a191a8 GH |
114 | static SIGRETTYPE |
115 | take_signal (int signum) | |
116 | { | |
ee149d03 | 117 | int saved_errno = errno; |
e1a191a8 | 118 | SCM ignored; |
0f781bf6 | 119 | |
e1a191a8 GH |
120 | if (!scm_ints_disabled) |
121 | { | |
122 | /* For reasons of speed, the SCM_NEWCELL macro doesn't defer | |
123 | interrupts. Instead, it first sets its argument to point to | |
124 | the first cell in the list, and then advances the freelist | |
125 | pointer to the next cell. Now, if this procedure is | |
126 | interrupted, the only anomalous state possible is to have | |
127 | both SCM_NEWCELL's argument and scm_freelist pointing to the | |
128 | same cell. To deal with this case, we always throw away the | |
129 | first cell in scm_freelist here. | |
130 | ||
131 | At least, that's the theory. I'm not convinced that that's | |
132 | the only anomalous path we need to worry about. */ | |
133 | SCM_NEWCELL (ignored); | |
134 | } | |
135 | got_signal[signum] = 1; | |
136 | #if HAVE_SIGACTION | |
137 | /* unblock the signal before the scheme handler gets to run, since | |
138 | it may use longjmp to escape (i.e., throw an exception). */ | |
139 | { | |
140 | sigset_t set; | |
141 | sigemptyset (&set); | |
142 | sigaddset (&set, signum); | |
143 | sigprocmask (SIG_UNBLOCK, &set, NULL); | |
144 | } | |
145 | #endif | |
146 | scm_system_async_mark (signal_async); | |
ee149d03 | 147 | errno = saved_errno; |
e1a191a8 | 148 | } |
0f2d19dd | 149 | |
e1a191a8 GH |
150 | static SCM |
151 | sys_deliver_signals (void) | |
152 | { | |
153 | int i; | |
154 | ||
155 | for (i = 0; i < NSIG; i++) | |
156 | { | |
157 | if (got_signal[i]) | |
158 | { | |
cc0b3312 GH |
159 | /* The flag is reset before calling the handler in case the |
160 | handler doesn't return. If the handler doesn't return | |
161 | but leaves other signals flagged, they their handlers | |
162 | will be applied some time later when the async is checked | |
163 | again. It would probably be better to reset the flags | |
164 | after doing a longjmp. */ | |
e1a191a8 GH |
165 | got_signal[i] = 0; |
166 | #ifndef HAVE_SIGACTION | |
167 | signal (i, take_signal); | |
168 | #endif | |
adb2c53b | 169 | scm_apply (SCM_VELTS (*signal_handlers)[i], |
e0c08f17 | 170 | SCM_LIST1 (SCM_MAKINUM (i)), |
2ad6b1a5 | 171 | SCM_EOL); |
e1a191a8 GH |
172 | } |
173 | } | |
174 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
175 | } |
176 | ||
e1a191a8 | 177 | /* user interface for installation of signal handlers. */ |
adb2c53b | 178 | SCM_DEFINE (scm_sigaction, "sigaction", 1, 2, 0, |
1bbd0b84 | 179 | (SCM signum, SCM handler, SCM flags), |
0d172d3f | 180 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
181 | "@var{signum} is the signal number, which can be specified using the value\n" |
182 | "of variables such as @code{SIGINT}.\n\n" | |
183 | "If @var{action} is omitted, @code{sigaction} returns a pair: the\n" | |
184 | "CAR is the current\n" | |
185 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
186 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
187 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
188 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
189 | "If @var{action} is provided, it is installed as the new handler for\n" | |
190 | "@var{signum}. @var{action} can be a Scheme procedure taking one\n" | |
191 | "argument, or the value of @code{SIG_DFL} (default action) or\n" | |
192 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
193 | "was installed before @code{sigaction} was first used. Flags can\n" | |
194 | "optionally be specified for the new handler (@code{SA_RESTART} will\n" | |
0d172d3f | 195 | "always be added if it's available and the system is using restartable\n" |
b380b885 MD |
196 | "system calls.) The return value is a pair with information about the\n" |
197 | "old handler as described above.\n\n" | |
198 | "This interface does not provide access to the \"signal blocking\"\n" | |
199 | "facility. Maybe this is not needed, since the thread support may\n" | |
200 | "provide solutions to the problem of consistent access to data\n" | |
201 | "structures.") | |
1bbd0b84 | 202 | #define FUNC_NAME s_scm_sigaction |
e1a191a8 GH |
203 | { |
204 | int csig; | |
205 | #ifdef HAVE_SIGACTION | |
206 | struct sigaction action; | |
207 | struct sigaction old_action; | |
208 | #else | |
209 | SIGRETTYPE (* chandler) (int); | |
210 | SIGRETTYPE (* old_chandler) (int); | |
211 | #endif | |
212 | int query_only = 0; | |
213 | int save_handler = 0; | |
214 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
215 | SCM old_handler; | |
216 | ||
3b3b36dd | 217 | SCM_VALIDATE_INUM_COPY (1,signum,csig); |
7ee92fce GH |
218 | #if defined(HAVE_SIGACTION) |
219 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
220 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
221 | is defined, since libguile would be likely to produce spurious | |
222 | EINTR errors. */ | |
e1a191a8 GH |
223 | action.sa_flags = SA_RESTART; |
224 | #else | |
225 | action.sa_flags = 0; | |
226 | #endif | |
227 | if (!SCM_UNBNDP (flags)) | |
228 | { | |
3b3b36dd | 229 | SCM_VALIDATE_INUM (3,flags); |
e1a191a8 GH |
230 | action.sa_flags |= SCM_INUM (flags); |
231 | } | |
232 | sigemptyset (&action.sa_mask); | |
233 | #endif | |
234 | SCM_DEFER_INTS; | |
235 | old_handler = scheme_handlers[csig]; | |
236 | if (SCM_UNBNDP (handler)) | |
237 | query_only = 1; | |
9a09deb1 | 238 | else if (SCM_EQ_P (scm_integer_p (handler), SCM_BOOL_T)) |
e1a191a8 | 239 | { |
e4b265d8 DH |
240 | if (SCM_NUM2LONG (2, handler) == (long) SIG_DFL |
241 | || SCM_NUM2LONG (2, handler) == (long) SIG_IGN) | |
e1a191a8 GH |
242 | { |
243 | #ifdef HAVE_SIGACTION | |
244 | action.sa_handler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
245 | #else | |
246 | chandler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
247 | #endif | |
248 | scheme_handlers[csig] = SCM_BOOL_F; | |
249 | } | |
250 | else | |
1bbd0b84 | 251 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 GH |
252 | } |
253 | else if (SCM_FALSEP (handler)) | |
254 | { | |
255 | /* restore the default handler. */ | |
256 | #ifdef HAVE_SIGACTION | |
257 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
258 | query_only = 1; | |
259 | else | |
260 | { | |
261 | action = orig_handlers[csig]; | |
262 | orig_handlers[csig].sa_handler = SIG_ERR; | |
263 | scheme_handlers[csig] = SCM_BOOL_F; | |
264 | } | |
265 | #else | |
266 | if (orig_handlers[csig] == SIG_ERR) | |
267 | query_only = 1; | |
268 | else | |
269 | { | |
270 | chandler = orig_handlers[csig]; | |
271 | orig_handlers[csig] = SIG_ERR; | |
272 | scheme_handlers[csig] = SCM_BOOL_F; | |
273 | } | |
274 | #endif | |
adb2c53b | 275 | } |
e1a191a8 GH |
276 | else |
277 | { | |
6b5a304f | 278 | SCM_VALIDATE_NIM (2,handler); |
e1a191a8 GH |
279 | #ifdef HAVE_SIGACTION |
280 | action.sa_handler = take_signal; | |
281 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
282 | save_handler = 1; | |
283 | #else | |
284 | chandler = take_signal; | |
285 | if (orig_handlers[csig] == SIG_ERR) | |
286 | save_handler = 1; | |
287 | #endif | |
288 | scheme_handlers[csig] = handler; | |
289 | } | |
adb2c53b | 290 | |
0d172d3f MV |
291 | /* XXX - Silently ignore setting handlers for `program error signals' |
292 | because they can't currently be handled by Scheme code. | |
293 | */ | |
294 | ||
295 | switch (csig) | |
296 | { | |
297 | /* This list of program error signals is from the GNU Libc | |
298 | Reference Manual */ | |
299 | case SIGFPE: | |
300 | case SIGILL: | |
301 | case SIGSEGV: | |
302 | case SIGBUS: | |
303 | case SIGABRT: | |
6732de1b | 304 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
305 | case SIGIOT: |
306 | #endif | |
307 | case SIGTRAP: | |
308 | #ifdef SIGEMT | |
309 | case SIGEMT: | |
310 | #endif | |
adb2c53b | 311 | #ifdef SIGSYS |
0d172d3f | 312 | case SIGSYS: |
adb2c53b | 313 | #endif |
0d172d3f MV |
314 | query_only = 1; |
315 | } | |
316 | ||
e1a191a8 GH |
317 | #ifdef HAVE_SIGACTION |
318 | if (query_only) | |
319 | { | |
320 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 321 | SCM_SYSERROR; |
e1a191a8 GH |
322 | } |
323 | else | |
324 | { | |
325 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 326 | SCM_SYSERROR; |
e1a191a8 GH |
327 | if (save_handler) |
328 | orig_handlers[csig] = old_action; | |
329 | } | |
330 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 331 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 GH |
332 | SCM_ALLOW_INTS; |
333 | return scm_cons (old_handler, SCM_MAKINUM (old_action.sa_flags)); | |
334 | #else | |
335 | if (query_only) | |
336 | { | |
337 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 338 | SCM_SYSERROR; |
e1a191a8 | 339 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 340 | SCM_SYSERROR; |
e1a191a8 GH |
341 | } |
342 | else | |
343 | { | |
344 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 345 | SCM_SYSERROR; |
e1a191a8 GH |
346 | if (save_handler) |
347 | orig_handlers[csig] = old_chandler; | |
348 | } | |
349 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
da6e81b6 | 350 | old_handler = scm_long2num ((long) old_chandler); |
e1a191a8 GH |
351 | SCM_ALLOW_INTS; |
352 | return scm_cons (old_handler, SCM_MAKINUM (0)); | |
0f2d19dd | 353 | #endif |
e1a191a8 | 354 | } |
1bbd0b84 | 355 | #undef FUNC_NAME |
e1a191a8 | 356 | |
adb2c53b | 357 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 358 | (void), |
b380b885 MD |
359 | "Return all signal handlers to the values they had before any call to\n" |
360 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 361 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
362 | { |
363 | int i; | |
adb2c53b | 364 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); |
e1a191a8 GH |
365 | |
366 | for (i = 0; i < NSIG; i++) | |
367 | { | |
368 | #ifdef HAVE_SIGACTION | |
369 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
370 | { | |
371 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 372 | SCM_SYSERROR; |
e1a191a8 GH |
373 | orig_handlers[i].sa_handler = SIG_ERR; |
374 | scheme_handlers[i] = SCM_BOOL_F; | |
375 | } | |
376 | #else | |
377 | if (orig_handlers[i] != SIG_ERR) | |
378 | { | |
379 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 380 | SCM_SYSERROR; |
e1a191a8 GH |
381 | orig_handlers[i] = SIG_ERR; |
382 | scheme_handlers[i] = SCM_BOOL_F; | |
383 | } | |
384 | #endif | |
385 | } | |
386 | return SCM_UNSPECIFIED; | |
387 | } | |
1bbd0b84 | 388 | #undef FUNC_NAME |
0f2d19dd | 389 | |
adb2c53b | 390 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 391 | (SCM i), |
b380b885 MD |
392 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
393 | "number of seconds (an integer). It's advisable to install a signal\n" | |
394 | "handler for\n" | |
395 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
396 | "the process.\n\n" | |
397 | "The return value indicates the time remaining for the previous alarm,\n" | |
398 | "if any. The new value replaces the previous alarm. If there was\n" | |
399 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 400 | #define FUNC_NAME s_scm_alarm |
0f2d19dd JB |
401 | { |
402 | unsigned int j; | |
3b3b36dd | 403 | SCM_VALIDATE_INUM (1,i); |
e1a191a8 | 404 | j = alarm (SCM_INUM (i)); |
0f2d19dd JB |
405 | return SCM_MAKINUM (j); |
406 | } | |
1bbd0b84 | 407 | #undef FUNC_NAME |
0f2d19dd | 408 | |
0e958795 | 409 | #ifdef HAVE_PAUSE |
adb2c53b | 410 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 411 | (), |
b380b885 MD |
412 | "Pause the current process (thread?) until a signal arrives whose\n" |
413 | "action is to either terminate the current process or invoke a\n" | |
414 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 415 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
416 | { |
417 | pause (); | |
418 | return SCM_UNSPECIFIED; | |
419 | } | |
1bbd0b84 | 420 | #undef FUNC_NAME |
0e958795 | 421 | #endif |
0f2d19dd | 422 | |
adb2c53b | 423 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 424 | (SCM i), |
b380b885 MD |
425 | "Wait for the given number of seconds (an integer) or until a signal\n" |
426 | "arrives. The return value is zero if the time elapses or the number\n" | |
427 | "of seconds remaining otherwise.") | |
1bbd0b84 | 428 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 429 | { |
b74f4728 | 430 | unsigned long j; |
3b3b36dd | 431 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
432 | #ifdef USE_THREADS |
433 | j = scm_thread_sleep (SCM_INUM(i)); | |
434 | #else | |
e1a191a8 | 435 | j = sleep (SCM_INUM(i)); |
b74f4728 JB |
436 | #endif |
437 | return scm_ulong2num (j); | |
0f2d19dd | 438 | } |
1bbd0b84 | 439 | #undef FUNC_NAME |
0f2d19dd | 440 | |
b74f4728 | 441 | #if defined(USE_THREADS) || defined(HAVE_USLEEP) |
adb2c53b | 442 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 443 | (SCM i), |
5352393c MG |
444 | "Sleep for I microseconds. @code{usleep} is not available on\n" |
445 | "all platforms.") | |
1bbd0b84 | 446 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 447 | { |
3b3b36dd | 448 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
449 | |
450 | #ifdef USE_THREADS | |
451 | /* If we have threads, we use the thread system's sleep function. */ | |
452 | { | |
453 | unsigned long j = scm_thread_usleep (SCM_INUM (i)); | |
454 | return scm_ulong2num (j); | |
455 | } | |
456 | #else | |
0935d604 MD |
457 | #ifdef USLEEP_RETURNS_VOID |
458 | usleep (SCM_INUM (i)); | |
459 | return SCM_INUM0; | |
460 | #else | |
b74f4728 JB |
461 | { |
462 | int j = usleep (SCM_INUM (i)); | |
463 | return SCM_MAKINUM (j); | |
464 | } | |
0935d604 | 465 | #endif |
ce874f2d | 466 | #endif |
b74f4728 | 467 | } |
1bbd0b84 | 468 | #undef FUNC_NAME |
b74f4728 | 469 | #endif /* GUILE_ISELECT || HAVE_USLEEP */ |
ce874f2d | 470 | |
adb2c53b | 471 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 472 | (SCM sig), |
b380b885 MD |
473 | "Sends a specified signal @var{sig} to the current process, where\n" |
474 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 475 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 476 | { |
3b3b36dd | 477 | SCM_VALIDATE_INUM (1,sig); |
e1a191a8 GH |
478 | SCM_DEFER_INTS; |
479 | if (kill (getpid (), (int) SCM_INUM (sig)) != 0) | |
1bbd0b84 | 480 | SCM_SYSERROR; |
e1a191a8 GH |
481 | SCM_ALLOW_INTS; |
482 | return SCM_UNSPECIFIED; | |
0f2d19dd | 483 | } |
1bbd0b84 | 484 | #undef FUNC_NAME |
0f2d19dd JB |
485 | |
486 | \f | |
0f2d19dd | 487 | |
e1a191a8 GH |
488 | void |
489 | scm_init_scmsigs () | |
0f2d19dd | 490 | { |
e1a191a8 GH |
491 | SCM thunk; |
492 | int i; | |
493 | ||
494 | signal_handlers = | |
495 | SCM_CDRLOC (scm_sysintern ("signal-handlers", | |
00ffa0e7 | 496 | scm_c_make_vector (NSIG, SCM_BOOL_F))); |
e1a191a8 GH |
497 | thunk = scm_make_gsubr ("%deliver-signals", 0, 0, 0, |
498 | sys_deliver_signals); | |
499 | signal_async = scm_system_async (thunk); | |
500 | ||
501 | for (i = 0; i < NSIG; i++) | |
502 | { | |
503 | got_signal[i] = 0; | |
504 | #ifdef HAVE_SIGACTION | |
505 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 506 | |
e1a191a8 GH |
507 | #else |
508 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 509 | #endif |
840ae05d | 510 | |
08b8c694 | 511 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce | 512 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
adb2c53b | 513 | signals really are restartable. don't rely on the same |
7ee92fce GH |
514 | run-time that configure got: reset the default for every signal. |
515 | */ | |
516 | #ifdef HAVE_SIGINTERRUPT | |
517 | siginterrupt (i, 0); | |
de881428 | 518 | #elif defined(SA_RESTART) |
840ae05d JB |
519 | { |
520 | struct sigaction action; | |
521 | ||
522 | sigaction (i, NULL, &action); | |
523 | if (!(action.sa_flags & SA_RESTART)) | |
524 | { | |
3efb80f2 | 525 | action.sa_flags |= SA_RESTART; |
840ae05d JB |
526 | sigaction (i, &action, NULL); |
527 | } | |
528 | } | |
7ee92fce GH |
529 | #endif |
530 | /* if neither siginterrupt nor SA_RESTART are available we may | |
531 | as well assume that signals are always restartable. */ | |
840ae05d | 532 | #endif |
e1a191a8 | 533 | } |
1cc91f1b | 534 | |
e1a191a8 GH |
535 | scm_sysintern ("NSIG", scm_long2num (NSIG)); |
536 | scm_sysintern ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
537 | scm_sysintern ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
538 | #ifdef SA_NOCLDSTOP | |
539 | scm_sysintern ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); | |
0f2d19dd | 540 | #endif |
e1a191a8 GH |
541 | #ifdef SA_RESTART |
542 | scm_sysintern ("SA_RESTART", scm_long2num (SA_RESTART)); | |
0f2d19dd | 543 | #endif |
1cc91f1b | 544 | |
8dc9439f | 545 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 546 | #include "libguile/scmsigs.x" |
8dc9439f | 547 | #endif |
0f2d19dd JB |
548 | } |
549 | ||
89e00824 ML |
550 | |
551 | /* | |
552 | Local Variables: | |
553 | c-file-style: "gnu" | |
554 | End: | |
555 | */ |