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" | |
fdc28395 | 54 | #include "libguile/root.h" |
a0599745 | 55 | #include "libguile/vectors.h" |
1bbd0b84 | 56 | |
a0599745 MD |
57 | #include "libguile/validate.h" |
58 | #include "libguile/scmsigs.h" | |
20e6290e | 59 | |
0f2d19dd JB |
60 | #ifdef HAVE_UNISTD_H |
61 | #include <unistd.h> | |
62 | #endif | |
63 | ||
b74f4728 JB |
64 | /* The thread system has its own sleep and usleep functions. */ |
65 | #ifndef USE_THREADS | |
66 | ||
67 | #if defined(MISSING_SLEEP_DECL) | |
68 | int sleep (); | |
69 | #endif | |
70 | ||
71 | #if defined(HAVE_USLEEP) && defined(MISSING_USLEEP_DECL) | |
72 | int usleep (); | |
ce874f2d | 73 | #endif |
b74f4728 | 74 | |
0935d604 | 75 | #endif |
0f2d19dd JB |
76 | |
77 | \f | |
78 | ||
e1a191a8 | 79 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
80 | |
81 | #ifdef RETSIGTYPE | |
e1a191a8 | 82 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 83 | #else |
e1a191a8 GH |
84 | # ifdef STDC_HEADERS |
85 | # define SIGRETTYPE void | |
86 | # else | |
87 | # define SIGRETTYPE int | |
88 | # endif | |
0f2d19dd JB |
89 | #endif |
90 | ||
91 | \f | |
92 | ||
e1a191a8 GH |
93 | /* take_signal is installed as the C signal handler whenever a Scheme |
94 | handler is set. when a signal arrives, take_signal marks the corresponding | |
95 | element of got_signal and marks signal_async. the thunk in signal_async | |
96 | (sys_deliver_signals) will be run at the next opportunity, outside a | |
97 | critical section. sys_deliver_signals runs each Scheme handler for | |
98 | which got_signal is set. */ | |
0f2d19dd | 99 | |
e1a191a8 | 100 | static SCM signal_async; |
0f2d19dd | 101 | |
e1a191a8 | 102 | static char got_signal[NSIG]; |
0f2d19dd | 103 | |
e1a191a8 GH |
104 | /* a Scheme vector of handler procedures. */ |
105 | static SCM *signal_handlers; | |
0f2d19dd | 106 | |
e1a191a8 GH |
107 | /* saves the original C handlers, when a new handler is installed. |
108 | set to SIG_ERR if the original handler is installed. */ | |
109 | #ifdef HAVE_SIGACTION | |
110 | static struct sigaction orig_handlers[NSIG]; | |
111 | #else | |
da6e81b6 | 112 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
113 | #endif |
114 | ||
e1a191a8 GH |
115 | static SIGRETTYPE |
116 | take_signal (int signum) | |
117 | { | |
ee149d03 | 118 | int saved_errno = errno; |
e1a191a8 | 119 | SCM ignored; |
0f781bf6 | 120 | |
e1a191a8 GH |
121 | if (!scm_ints_disabled) |
122 | { | |
123 | /* For reasons of speed, the SCM_NEWCELL macro doesn't defer | |
124 | interrupts. Instead, it first sets its argument to point to | |
125 | the first cell in the list, and then advances the freelist | |
126 | pointer to the next cell. Now, if this procedure is | |
127 | interrupted, the only anomalous state possible is to have | |
128 | both SCM_NEWCELL's argument and scm_freelist pointing to the | |
129 | same cell. To deal with this case, we always throw away the | |
130 | first cell in scm_freelist here. | |
131 | ||
132 | At least, that's the theory. I'm not convinced that that's | |
133 | the only anomalous path we need to worry about. */ | |
134 | SCM_NEWCELL (ignored); | |
135 | } | |
136 | got_signal[signum] = 1; | |
137 | #if HAVE_SIGACTION | |
138 | /* unblock the signal before the scheme handler gets to run, since | |
139 | it may use longjmp to escape (i.e., throw an exception). */ | |
140 | { | |
141 | sigset_t set; | |
142 | sigemptyset (&set); | |
143 | sigaddset (&set, signum); | |
144 | sigprocmask (SIG_UNBLOCK, &set, NULL); | |
145 | } | |
146 | #endif | |
147 | scm_system_async_mark (signal_async); | |
ee149d03 | 148 | errno = saved_errno; |
e1a191a8 | 149 | } |
0f2d19dd | 150 | |
e1a191a8 GH |
151 | static SCM |
152 | sys_deliver_signals (void) | |
153 | { | |
154 | int i; | |
155 | ||
156 | for (i = 0; i < NSIG; i++) | |
157 | { | |
158 | if (got_signal[i]) | |
159 | { | |
cc0b3312 GH |
160 | /* The flag is reset before calling the handler in case the |
161 | handler doesn't return. If the handler doesn't return | |
162 | but leaves other signals flagged, they their handlers | |
163 | will be applied some time later when the async is checked | |
164 | again. It would probably be better to reset the flags | |
165 | after doing a longjmp. */ | |
e1a191a8 GH |
166 | got_signal[i] = 0; |
167 | #ifndef HAVE_SIGACTION | |
168 | signal (i, take_signal); | |
169 | #endif | |
fdc28395 | 170 | scm_call_1 (SCM_VELTS (*signal_handlers)[i], SCM_MAKINUM (i)); |
e1a191a8 GH |
171 | } |
172 | } | |
173 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
174 | } |
175 | ||
e1a191a8 | 176 | /* user interface for installation of signal handlers. */ |
adb2c53b | 177 | SCM_DEFINE (scm_sigaction, "sigaction", 1, 2, 0, |
1bbd0b84 | 178 | (SCM signum, SCM handler, SCM flags), |
0d172d3f | 179 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
180 | "@var{signum} is the signal number, which can be specified using the value\n" |
181 | "of variables such as @code{SIGINT}.\n\n" | |
182 | "If @var{action} is omitted, @code{sigaction} returns a pair: the\n" | |
183 | "CAR is the current\n" | |
184 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
185 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
186 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
187 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
188 | "If @var{action} is provided, it is installed as the new handler for\n" | |
189 | "@var{signum}. @var{action} can be a Scheme procedure taking one\n" | |
190 | "argument, or the value of @code{SIG_DFL} (default action) or\n" | |
191 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
192 | "was installed before @code{sigaction} was first used. Flags can\n" | |
193 | "optionally be specified for the new handler (@code{SA_RESTART} will\n" | |
0d172d3f | 194 | "always be added if it's available and the system is using restartable\n" |
b380b885 MD |
195 | "system calls.) The return value is a pair with information about the\n" |
196 | "old handler as described above.\n\n" | |
197 | "This interface does not provide access to the \"signal blocking\"\n" | |
198 | "facility. Maybe this is not needed, since the thread support may\n" | |
199 | "provide solutions to the problem of consistent access to data\n" | |
200 | "structures.") | |
1bbd0b84 | 201 | #define FUNC_NAME s_scm_sigaction |
e1a191a8 GH |
202 | { |
203 | int csig; | |
204 | #ifdef HAVE_SIGACTION | |
205 | struct sigaction action; | |
206 | struct sigaction old_action; | |
207 | #else | |
208 | SIGRETTYPE (* chandler) (int); | |
209 | SIGRETTYPE (* old_chandler) (int); | |
210 | #endif | |
211 | int query_only = 0; | |
212 | int save_handler = 0; | |
213 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
214 | SCM old_handler; | |
215 | ||
3b3b36dd | 216 | SCM_VALIDATE_INUM_COPY (1,signum,csig); |
7ee92fce GH |
217 | #if defined(HAVE_SIGACTION) |
218 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
219 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
220 | is defined, since libguile would be likely to produce spurious | |
221 | EINTR errors. */ | |
e1a191a8 GH |
222 | action.sa_flags = SA_RESTART; |
223 | #else | |
224 | action.sa_flags = 0; | |
225 | #endif | |
226 | if (!SCM_UNBNDP (flags)) | |
227 | { | |
3b3b36dd | 228 | SCM_VALIDATE_INUM (3,flags); |
e1a191a8 GH |
229 | action.sa_flags |= SCM_INUM (flags); |
230 | } | |
231 | sigemptyset (&action.sa_mask); | |
232 | #endif | |
233 | SCM_DEFER_INTS; | |
234 | old_handler = scheme_handlers[csig]; | |
235 | if (SCM_UNBNDP (handler)) | |
236 | query_only = 1; | |
9a09deb1 | 237 | else if (SCM_EQ_P (scm_integer_p (handler), SCM_BOOL_T)) |
e1a191a8 | 238 | { |
e4b265d8 DH |
239 | if (SCM_NUM2LONG (2, handler) == (long) SIG_DFL |
240 | || SCM_NUM2LONG (2, handler) == (long) SIG_IGN) | |
e1a191a8 GH |
241 | { |
242 | #ifdef HAVE_SIGACTION | |
243 | action.sa_handler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
244 | #else | |
245 | chandler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
246 | #endif | |
247 | scheme_handlers[csig] = SCM_BOOL_F; | |
248 | } | |
249 | else | |
1bbd0b84 | 250 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 GH |
251 | } |
252 | else if (SCM_FALSEP (handler)) | |
253 | { | |
254 | /* restore the default handler. */ | |
255 | #ifdef HAVE_SIGACTION | |
256 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
257 | query_only = 1; | |
258 | else | |
259 | { | |
260 | action = orig_handlers[csig]; | |
261 | orig_handlers[csig].sa_handler = SIG_ERR; | |
262 | scheme_handlers[csig] = SCM_BOOL_F; | |
263 | } | |
264 | #else | |
265 | if (orig_handlers[csig] == SIG_ERR) | |
266 | query_only = 1; | |
267 | else | |
268 | { | |
269 | chandler = orig_handlers[csig]; | |
270 | orig_handlers[csig] = SIG_ERR; | |
271 | scheme_handlers[csig] = SCM_BOOL_F; | |
272 | } | |
273 | #endif | |
adb2c53b | 274 | } |
e1a191a8 GH |
275 | else |
276 | { | |
6b5a304f | 277 | SCM_VALIDATE_NIM (2,handler); |
e1a191a8 GH |
278 | #ifdef HAVE_SIGACTION |
279 | action.sa_handler = take_signal; | |
280 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
281 | save_handler = 1; | |
282 | #else | |
283 | chandler = take_signal; | |
284 | if (orig_handlers[csig] == SIG_ERR) | |
285 | save_handler = 1; | |
286 | #endif | |
287 | scheme_handlers[csig] = handler; | |
288 | } | |
adb2c53b | 289 | |
0d172d3f MV |
290 | /* XXX - Silently ignore setting handlers for `program error signals' |
291 | because they can't currently be handled by Scheme code. | |
292 | */ | |
293 | ||
294 | switch (csig) | |
295 | { | |
296 | /* This list of program error signals is from the GNU Libc | |
297 | Reference Manual */ | |
298 | case SIGFPE: | |
299 | case SIGILL: | |
300 | case SIGSEGV: | |
301 | case SIGBUS: | |
302 | case SIGABRT: | |
6732de1b | 303 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
304 | case SIGIOT: |
305 | #endif | |
306 | case SIGTRAP: | |
307 | #ifdef SIGEMT | |
308 | case SIGEMT: | |
309 | #endif | |
adb2c53b | 310 | #ifdef SIGSYS |
0d172d3f | 311 | case SIGSYS: |
adb2c53b | 312 | #endif |
0d172d3f MV |
313 | query_only = 1; |
314 | } | |
315 | ||
e1a191a8 GH |
316 | #ifdef HAVE_SIGACTION |
317 | if (query_only) | |
318 | { | |
319 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 320 | SCM_SYSERROR; |
e1a191a8 GH |
321 | } |
322 | else | |
323 | { | |
324 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 325 | SCM_SYSERROR; |
e1a191a8 GH |
326 | if (save_handler) |
327 | orig_handlers[csig] = old_action; | |
328 | } | |
329 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 330 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 GH |
331 | SCM_ALLOW_INTS; |
332 | return scm_cons (old_handler, SCM_MAKINUM (old_action.sa_flags)); | |
333 | #else | |
334 | if (query_only) | |
335 | { | |
336 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 337 | SCM_SYSERROR; |
e1a191a8 | 338 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 339 | SCM_SYSERROR; |
e1a191a8 GH |
340 | } |
341 | else | |
342 | { | |
343 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 344 | SCM_SYSERROR; |
e1a191a8 GH |
345 | if (save_handler) |
346 | orig_handlers[csig] = old_chandler; | |
347 | } | |
348 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
da6e81b6 | 349 | old_handler = scm_long2num ((long) old_chandler); |
e1a191a8 GH |
350 | SCM_ALLOW_INTS; |
351 | return scm_cons (old_handler, SCM_MAKINUM (0)); | |
0f2d19dd | 352 | #endif |
e1a191a8 | 353 | } |
1bbd0b84 | 354 | #undef FUNC_NAME |
e1a191a8 | 355 | |
adb2c53b | 356 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 357 | (void), |
b380b885 MD |
358 | "Return all signal handlers to the values they had before any call to\n" |
359 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 360 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
361 | { |
362 | int i; | |
adb2c53b | 363 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); |
e1a191a8 GH |
364 | |
365 | for (i = 0; i < NSIG; i++) | |
366 | { | |
367 | #ifdef HAVE_SIGACTION | |
368 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
369 | { | |
370 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 371 | SCM_SYSERROR; |
e1a191a8 GH |
372 | orig_handlers[i].sa_handler = SIG_ERR; |
373 | scheme_handlers[i] = SCM_BOOL_F; | |
374 | } | |
375 | #else | |
376 | if (orig_handlers[i] != SIG_ERR) | |
377 | { | |
378 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 379 | SCM_SYSERROR; |
e1a191a8 GH |
380 | orig_handlers[i] = SIG_ERR; |
381 | scheme_handlers[i] = SCM_BOOL_F; | |
382 | } | |
383 | #endif | |
384 | } | |
385 | return SCM_UNSPECIFIED; | |
386 | } | |
1bbd0b84 | 387 | #undef FUNC_NAME |
0f2d19dd | 388 | |
adb2c53b | 389 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 390 | (SCM i), |
b380b885 MD |
391 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
392 | "number of seconds (an integer). It's advisable to install a signal\n" | |
393 | "handler for\n" | |
394 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
395 | "the process.\n\n" | |
396 | "The return value indicates the time remaining for the previous alarm,\n" | |
397 | "if any. The new value replaces the previous alarm. If there was\n" | |
398 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 399 | #define FUNC_NAME s_scm_alarm |
0f2d19dd JB |
400 | { |
401 | unsigned int j; | |
3b3b36dd | 402 | SCM_VALIDATE_INUM (1,i); |
e1a191a8 | 403 | j = alarm (SCM_INUM (i)); |
0f2d19dd JB |
404 | return SCM_MAKINUM (j); |
405 | } | |
1bbd0b84 | 406 | #undef FUNC_NAME |
0f2d19dd | 407 | |
0e958795 | 408 | #ifdef HAVE_PAUSE |
adb2c53b | 409 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 410 | (), |
b380b885 MD |
411 | "Pause the current process (thread?) until a signal arrives whose\n" |
412 | "action is to either terminate the current process or invoke a\n" | |
413 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 414 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
415 | { |
416 | pause (); | |
417 | return SCM_UNSPECIFIED; | |
418 | } | |
1bbd0b84 | 419 | #undef FUNC_NAME |
0e958795 | 420 | #endif |
0f2d19dd | 421 | |
adb2c53b | 422 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 423 | (SCM i), |
b380b885 MD |
424 | "Wait for the given number of seconds (an integer) or until a signal\n" |
425 | "arrives. The return value is zero if the time elapses or the number\n" | |
426 | "of seconds remaining otherwise.") | |
1bbd0b84 | 427 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 428 | { |
b74f4728 | 429 | unsigned long j; |
3b3b36dd | 430 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
431 | #ifdef USE_THREADS |
432 | j = scm_thread_sleep (SCM_INUM(i)); | |
433 | #else | |
e1a191a8 | 434 | j = sleep (SCM_INUM(i)); |
b74f4728 JB |
435 | #endif |
436 | return scm_ulong2num (j); | |
0f2d19dd | 437 | } |
1bbd0b84 | 438 | #undef FUNC_NAME |
0f2d19dd | 439 | |
b74f4728 | 440 | #if defined(USE_THREADS) || defined(HAVE_USLEEP) |
adb2c53b | 441 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 442 | (SCM i), |
5352393c MG |
443 | "Sleep for I microseconds. @code{usleep} is not available on\n" |
444 | "all platforms.") | |
1bbd0b84 | 445 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 446 | { |
3b3b36dd | 447 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
448 | |
449 | #ifdef USE_THREADS | |
450 | /* If we have threads, we use the thread system's sleep function. */ | |
451 | { | |
452 | unsigned long j = scm_thread_usleep (SCM_INUM (i)); | |
453 | return scm_ulong2num (j); | |
454 | } | |
455 | #else | |
0935d604 MD |
456 | #ifdef USLEEP_RETURNS_VOID |
457 | usleep (SCM_INUM (i)); | |
458 | return SCM_INUM0; | |
459 | #else | |
b74f4728 JB |
460 | { |
461 | int j = usleep (SCM_INUM (i)); | |
462 | return SCM_MAKINUM (j); | |
463 | } | |
0935d604 | 464 | #endif |
ce874f2d | 465 | #endif |
b74f4728 | 466 | } |
1bbd0b84 | 467 | #undef FUNC_NAME |
b74f4728 | 468 | #endif /* GUILE_ISELECT || HAVE_USLEEP */ |
ce874f2d | 469 | |
adb2c53b | 470 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 471 | (SCM sig), |
b380b885 MD |
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 = | |
86d31dfe MV |
494 | SCM_VARIABLE_LOC (scm_c_define ("signal-handlers", |
495 | scm_c_make_vector (NSIG, SCM_BOOL_F))); | |
9a441ddb MV |
496 | /* XXX - use scm_c_make_gsubr here instead of `define'? */ |
497 | thunk = scm_c_define_gsubr ("%deliver-signals", 0, 0, 0, | |
498 | sys_deliver_signals); | |
e1a191a8 GH |
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 | |
86d31dfe MV |
535 | scm_c_define ("NSIG", scm_long2num (NSIG)); |
536 | scm_c_define ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
537 | scm_c_define ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
e1a191a8 | 538 | #ifdef SA_NOCLDSTOP |
86d31dfe | 539 | scm_c_define ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); |
0f2d19dd | 540 | #endif |
e1a191a8 | 541 | #ifdef SA_RESTART |
86d31dfe | 542 | scm_c_define ("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 | */ |