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8638b097 | 1 | /* Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc. |
0f2d19dd JB |
2 | * |
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. | |
7 | * | |
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. | |
12 | * | |
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 | ||
47 | #include <stdio.h> | |
48 | #include <signal.h> | |
a0599745 | 49 | #include "libguile/_scm.h" |
0f2d19dd | 50 | |
a0599745 MD |
51 | #include "libguile/async.h" |
52 | #include "libguile/eval.h" | |
53 | #include "libguile/vectors.h" | |
1bbd0b84 | 54 | |
a0599745 MD |
55 | #include "libguile/validate.h" |
56 | #include "libguile/scmsigs.h" | |
20e6290e | 57 | |
0f2d19dd JB |
58 | #ifdef HAVE_UNISTD_H |
59 | #include <unistd.h> | |
60 | #endif | |
61 | ||
b74f4728 JB |
62 | /* The thread system has its own sleep and usleep functions. */ |
63 | #ifndef USE_THREADS | |
64 | ||
65 | #if defined(MISSING_SLEEP_DECL) | |
66 | int sleep (); | |
67 | #endif | |
68 | ||
69 | #if defined(HAVE_USLEEP) && defined(MISSING_USLEEP_DECL) | |
70 | int usleep (); | |
ce874f2d | 71 | #endif |
b74f4728 | 72 | |
0935d604 | 73 | #endif |
0f2d19dd JB |
74 | |
75 | \f | |
76 | ||
317607b0 MD |
77 | #ifdef USE_MIT_PTHREADS |
78 | #undef signal | |
79 | #define signal pthread_signal | |
80 | #endif | |
81 | ||
0f2d19dd JB |
82 | \f |
83 | ||
e1a191a8 | 84 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
85 | |
86 | #ifdef RETSIGTYPE | |
e1a191a8 | 87 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 88 | #else |
e1a191a8 GH |
89 | # ifdef STDC_HEADERS |
90 | # define SIGRETTYPE void | |
91 | # else | |
92 | # define SIGRETTYPE int | |
93 | # endif | |
0f2d19dd JB |
94 | #endif |
95 | ||
96 | \f | |
97 | ||
e1a191a8 GH |
98 | /* take_signal is installed as the C signal handler whenever a Scheme |
99 | handler is set. when a signal arrives, take_signal marks the corresponding | |
100 | element of got_signal and marks signal_async. the thunk in signal_async | |
101 | (sys_deliver_signals) will be run at the next opportunity, outside a | |
102 | critical section. sys_deliver_signals runs each Scheme handler for | |
103 | which got_signal is set. */ | |
0f2d19dd | 104 | |
e1a191a8 | 105 | static SCM signal_async; |
0f2d19dd | 106 | |
e1a191a8 | 107 | static char got_signal[NSIG]; |
0f2d19dd | 108 | |
e1a191a8 GH |
109 | /* a Scheme vector of handler procedures. */ |
110 | static SCM *signal_handlers; | |
0f2d19dd | 111 | |
e1a191a8 GH |
112 | /* saves the original C handlers, when a new handler is installed. |
113 | set to SIG_ERR if the original handler is installed. */ | |
114 | #ifdef HAVE_SIGACTION | |
115 | static struct sigaction orig_handlers[NSIG]; | |
116 | #else | |
da6e81b6 | 117 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
118 | #endif |
119 | ||
e1a191a8 GH |
120 | static SIGRETTYPE |
121 | take_signal (int signum) | |
122 | { | |
ee149d03 | 123 | int saved_errno = errno; |
e1a191a8 | 124 | SCM ignored; |
0f781bf6 | 125 | |
e1a191a8 GH |
126 | if (!scm_ints_disabled) |
127 | { | |
128 | /* For reasons of speed, the SCM_NEWCELL macro doesn't defer | |
129 | interrupts. Instead, it first sets its argument to point to | |
130 | the first cell in the list, and then advances the freelist | |
131 | pointer to the next cell. Now, if this procedure is | |
132 | interrupted, the only anomalous state possible is to have | |
133 | both SCM_NEWCELL's argument and scm_freelist pointing to the | |
134 | same cell. To deal with this case, we always throw away the | |
135 | first cell in scm_freelist here. | |
136 | ||
137 | At least, that's the theory. I'm not convinced that that's | |
138 | the only anomalous path we need to worry about. */ | |
139 | SCM_NEWCELL (ignored); | |
140 | } | |
141 | got_signal[signum] = 1; | |
142 | #if HAVE_SIGACTION | |
143 | /* unblock the signal before the scheme handler gets to run, since | |
144 | it may use longjmp to escape (i.e., throw an exception). */ | |
145 | { | |
146 | sigset_t set; | |
147 | sigemptyset (&set); | |
148 | sigaddset (&set, signum); | |
149 | sigprocmask (SIG_UNBLOCK, &set, NULL); | |
150 | } | |
151 | #endif | |
152 | scm_system_async_mark (signal_async); | |
ee149d03 | 153 | errno = saved_errno; |
e1a191a8 | 154 | } |
0f2d19dd | 155 | |
e1a191a8 GH |
156 | static SCM |
157 | sys_deliver_signals (void) | |
158 | { | |
159 | int i; | |
160 | ||
161 | for (i = 0; i < NSIG; i++) | |
162 | { | |
163 | if (got_signal[i]) | |
164 | { | |
cc0b3312 GH |
165 | /* The flag is reset before calling the handler in case the |
166 | handler doesn't return. If the handler doesn't return | |
167 | but leaves other signals flagged, they their handlers | |
168 | will be applied some time later when the async is checked | |
169 | again. It would probably be better to reset the flags | |
170 | after doing a longjmp. */ | |
e1a191a8 GH |
171 | got_signal[i] = 0; |
172 | #ifndef HAVE_SIGACTION | |
173 | signal (i, take_signal); | |
174 | #endif | |
2ad6b1a5 GH |
175 | scm_apply (SCM_VELTS (*signal_handlers)[i], |
176 | scm_listify (SCM_MAKINUM (i), SCM_UNDEFINED), | |
177 | SCM_EOL); | |
e1a191a8 GH |
178 | } |
179 | } | |
180 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
181 | } |
182 | ||
e1a191a8 | 183 | /* user interface for installation of signal handlers. */ |
3b3b36dd | 184 | SCM_DEFINE (scm_sigaction, "sigaction", 1, 2, 0, |
1bbd0b84 | 185 | (SCM signum, SCM handler, SCM flags), |
b380b885 MD |
186 | "Install or report the signal hander for a specified signal.\n\n" |
187 | "@var{signum} is the signal number, which can be specified using the value\n" | |
188 | "of variables such as @code{SIGINT}.\n\n" | |
189 | "If @var{action} is omitted, @code{sigaction} returns a pair: the\n" | |
190 | "CAR is the current\n" | |
191 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
192 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
193 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
194 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
195 | "If @var{action} is provided, it is installed as the new handler for\n" | |
196 | "@var{signum}. @var{action} can be a Scheme procedure taking one\n" | |
197 | "argument, or the value of @code{SIG_DFL} (default action) or\n" | |
198 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
199 | "was installed before @code{sigaction} was first used. Flags can\n" | |
200 | "optionally be specified for the new handler (@code{SA_RESTART} will\n" | |
201 | "always be added if it's available and the system is using rstartable\n" | |
202 | "system calls.) The return value is a pair with information about the\n" | |
203 | "old handler as described above.\n\n" | |
204 | "This interface does not provide access to the \"signal blocking\"\n" | |
205 | "facility. Maybe this is not needed, since the thread support may\n" | |
206 | "provide solutions to the problem of consistent access to data\n" | |
207 | "structures.") | |
1bbd0b84 | 208 | #define FUNC_NAME s_scm_sigaction |
e1a191a8 GH |
209 | { |
210 | int csig; | |
211 | #ifdef HAVE_SIGACTION | |
212 | struct sigaction action; | |
213 | struct sigaction old_action; | |
214 | #else | |
215 | SIGRETTYPE (* chandler) (int); | |
216 | SIGRETTYPE (* old_chandler) (int); | |
217 | #endif | |
218 | int query_only = 0; | |
219 | int save_handler = 0; | |
220 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
221 | SCM old_handler; | |
222 | ||
3b3b36dd | 223 | SCM_VALIDATE_INUM_COPY (1,signum,csig); |
7ee92fce GH |
224 | #if defined(HAVE_SIGACTION) |
225 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
226 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
227 | is defined, since libguile would be likely to produce spurious | |
228 | EINTR errors. */ | |
e1a191a8 GH |
229 | action.sa_flags = SA_RESTART; |
230 | #else | |
231 | action.sa_flags = 0; | |
232 | #endif | |
233 | if (!SCM_UNBNDP (flags)) | |
234 | { | |
3b3b36dd | 235 | SCM_VALIDATE_INUM (3,flags); |
e1a191a8 GH |
236 | action.sa_flags |= SCM_INUM (flags); |
237 | } | |
238 | sigemptyset (&action.sa_mask); | |
239 | #endif | |
240 | SCM_DEFER_INTS; | |
241 | old_handler = scheme_handlers[csig]; | |
242 | if (SCM_UNBNDP (handler)) | |
243 | query_only = 1; | |
fbd485ba | 244 | else if (SCM_TRUE_P (scm_integer_p (handler))) |
e1a191a8 | 245 | { |
1bbd0b84 GB |
246 | if (SCM_NUM2LONG (2,handler) == (long) SIG_DFL |
247 | || SCM_NUM2LONG (2,handler) == (long) SIG_IGN) | |
e1a191a8 GH |
248 | { |
249 | #ifdef HAVE_SIGACTION | |
250 | action.sa_handler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
251 | #else | |
252 | chandler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
253 | #endif | |
254 | scheme_handlers[csig] = SCM_BOOL_F; | |
255 | } | |
256 | else | |
1bbd0b84 | 257 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 GH |
258 | } |
259 | else if (SCM_FALSEP (handler)) | |
260 | { | |
261 | /* restore the default handler. */ | |
262 | #ifdef HAVE_SIGACTION | |
263 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
264 | query_only = 1; | |
265 | else | |
266 | { | |
267 | action = orig_handlers[csig]; | |
268 | orig_handlers[csig].sa_handler = SIG_ERR; | |
269 | scheme_handlers[csig] = SCM_BOOL_F; | |
270 | } | |
271 | #else | |
272 | if (orig_handlers[csig] == SIG_ERR) | |
273 | query_only = 1; | |
274 | else | |
275 | { | |
276 | chandler = orig_handlers[csig]; | |
277 | orig_handlers[csig] = SIG_ERR; | |
278 | scheme_handlers[csig] = SCM_BOOL_F; | |
279 | } | |
280 | #endif | |
281 | } | |
282 | else | |
283 | { | |
6b5a304f | 284 | SCM_VALIDATE_NIM (2,handler); |
e1a191a8 GH |
285 | #ifdef HAVE_SIGACTION |
286 | action.sa_handler = take_signal; | |
287 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
288 | save_handler = 1; | |
289 | #else | |
290 | chandler = take_signal; | |
291 | if (orig_handlers[csig] == SIG_ERR) | |
292 | save_handler = 1; | |
293 | #endif | |
294 | scheme_handlers[csig] = handler; | |
295 | } | |
296 | #ifdef HAVE_SIGACTION | |
297 | if (query_only) | |
298 | { | |
299 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 300 | SCM_SYSERROR; |
e1a191a8 GH |
301 | } |
302 | else | |
303 | { | |
304 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 305 | SCM_SYSERROR; |
e1a191a8 GH |
306 | if (save_handler) |
307 | orig_handlers[csig] = old_action; | |
308 | } | |
309 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 310 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 GH |
311 | SCM_ALLOW_INTS; |
312 | return scm_cons (old_handler, SCM_MAKINUM (old_action.sa_flags)); | |
313 | #else | |
314 | if (query_only) | |
315 | { | |
316 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 317 | SCM_SYSERROR; |
e1a191a8 | 318 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 319 | SCM_SYSERROR; |
e1a191a8 GH |
320 | } |
321 | else | |
322 | { | |
323 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 324 | SCM_SYSERROR; |
e1a191a8 GH |
325 | if (save_handler) |
326 | orig_handlers[csig] = old_chandler; | |
327 | } | |
328 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
da6e81b6 | 329 | old_handler = scm_long2num ((long) old_chandler); |
e1a191a8 GH |
330 | SCM_ALLOW_INTS; |
331 | return scm_cons (old_handler, SCM_MAKINUM (0)); | |
0f2d19dd | 332 | #endif |
e1a191a8 | 333 | } |
1bbd0b84 | 334 | #undef FUNC_NAME |
e1a191a8 | 335 | |
a1ec6916 | 336 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 337 | (void), |
b380b885 MD |
338 | "Return all signal handlers to the values they had before any call to\n" |
339 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 340 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
341 | { |
342 | int i; | |
343 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
344 | ||
345 | for (i = 0; i < NSIG; i++) | |
346 | { | |
347 | #ifdef HAVE_SIGACTION | |
348 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
349 | { | |
350 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 351 | SCM_SYSERROR; |
e1a191a8 GH |
352 | orig_handlers[i].sa_handler = SIG_ERR; |
353 | scheme_handlers[i] = SCM_BOOL_F; | |
354 | } | |
355 | #else | |
356 | if (orig_handlers[i] != SIG_ERR) | |
357 | { | |
358 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 359 | SCM_SYSERROR; |
e1a191a8 GH |
360 | orig_handlers[i] = SIG_ERR; |
361 | scheme_handlers[i] = SCM_BOOL_F; | |
362 | } | |
363 | #endif | |
364 | } | |
365 | return SCM_UNSPECIFIED; | |
366 | } | |
1bbd0b84 | 367 | #undef FUNC_NAME |
0f2d19dd | 368 | |
3b3b36dd | 369 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 370 | (SCM i), |
b380b885 MD |
371 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
372 | "number of seconds (an integer). It's advisable to install a signal\n" | |
373 | "handler for\n" | |
374 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
375 | "the process.\n\n" | |
376 | "The return value indicates the time remaining for the previous alarm,\n" | |
377 | "if any. The new value replaces the previous alarm. If there was\n" | |
378 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 379 | #define FUNC_NAME s_scm_alarm |
0f2d19dd JB |
380 | { |
381 | unsigned int j; | |
3b3b36dd | 382 | SCM_VALIDATE_INUM (1,i); |
e1a191a8 | 383 | j = alarm (SCM_INUM (i)); |
0f2d19dd JB |
384 | return SCM_MAKINUM (j); |
385 | } | |
1bbd0b84 | 386 | #undef FUNC_NAME |
0f2d19dd | 387 | |
0e958795 | 388 | #ifdef HAVE_PAUSE |
3b3b36dd | 389 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 390 | (), |
b380b885 MD |
391 | "Pause the current process (thread?) until a signal arrives whose\n" |
392 | "action is to either terminate the current process or invoke a\n" | |
393 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 394 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
395 | { |
396 | pause (); | |
397 | return SCM_UNSPECIFIED; | |
398 | } | |
1bbd0b84 | 399 | #undef FUNC_NAME |
0e958795 | 400 | #endif |
0f2d19dd | 401 | |
3b3b36dd | 402 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 403 | (SCM i), |
b380b885 MD |
404 | "Wait for the given number of seconds (an integer) or until a signal\n" |
405 | "arrives. The return value is zero if the time elapses or the number\n" | |
406 | "of seconds remaining otherwise.") | |
1bbd0b84 | 407 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 408 | { |
b74f4728 | 409 | unsigned long j; |
3b3b36dd | 410 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
411 | #ifdef USE_THREADS |
412 | j = scm_thread_sleep (SCM_INUM(i)); | |
413 | #else | |
e1a191a8 | 414 | j = sleep (SCM_INUM(i)); |
b74f4728 JB |
415 | #endif |
416 | return scm_ulong2num (j); | |
0f2d19dd | 417 | } |
1bbd0b84 | 418 | #undef FUNC_NAME |
0f2d19dd | 419 | |
b74f4728 | 420 | #if defined(USE_THREADS) || defined(HAVE_USLEEP) |
3b3b36dd | 421 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 422 | (SCM i), |
b450f070 GB |
423 | "Sleep for I microseconds.\n" |
424 | "`usleep' is not available on all platforms.") | |
1bbd0b84 | 425 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 426 | { |
3b3b36dd | 427 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
428 | |
429 | #ifdef USE_THREADS | |
430 | /* If we have threads, we use the thread system's sleep function. */ | |
431 | { | |
432 | unsigned long j = scm_thread_usleep (SCM_INUM (i)); | |
433 | return scm_ulong2num (j); | |
434 | } | |
435 | #else | |
0935d604 MD |
436 | #ifdef USLEEP_RETURNS_VOID |
437 | usleep (SCM_INUM (i)); | |
438 | return SCM_INUM0; | |
439 | #else | |
b74f4728 JB |
440 | { |
441 | int j = usleep (SCM_INUM (i)); | |
442 | return SCM_MAKINUM (j); | |
443 | } | |
0935d604 | 444 | #endif |
ce874f2d | 445 | #endif |
b74f4728 | 446 | } |
1bbd0b84 | 447 | #undef FUNC_NAME |
b74f4728 | 448 | #endif /* GUILE_ISELECT || HAVE_USLEEP */ |
ce874f2d | 449 | |
3b3b36dd | 450 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 451 | (SCM sig), |
b380b885 MD |
452 | "\n" |
453 | "Sends a specified signal @var{sig} to the current process, where\n" | |
454 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 455 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 456 | { |
3b3b36dd | 457 | SCM_VALIDATE_INUM (1,sig); |
e1a191a8 GH |
458 | SCM_DEFER_INTS; |
459 | if (kill (getpid (), (int) SCM_INUM (sig)) != 0) | |
1bbd0b84 | 460 | SCM_SYSERROR; |
e1a191a8 GH |
461 | SCM_ALLOW_INTS; |
462 | return SCM_UNSPECIFIED; | |
0f2d19dd | 463 | } |
1bbd0b84 | 464 | #undef FUNC_NAME |
0f2d19dd | 465 | |
0f781bf6 MV |
466 | SCM_PROC(s_segfault, "segfault", 0, 0, 0, scm_segfault); |
467 | ||
468 | SCM | |
469 | scm_segfault () | |
470 | { | |
471 | *(int *)0 = 0; | |
472 | return SCM_UNSPECIFIED; | |
473 | } | |
474 | ||
0f2d19dd | 475 | \f |
0f2d19dd | 476 | |
e1a191a8 GH |
477 | void |
478 | scm_init_scmsigs () | |
0f2d19dd | 479 | { |
e1a191a8 GH |
480 | SCM thunk; |
481 | int i; | |
482 | ||
483 | signal_handlers = | |
484 | SCM_CDRLOC (scm_sysintern ("signal-handlers", | |
485 | scm_make_vector (SCM_MAKINUM (NSIG), | |
e1a191a8 GH |
486 | SCM_BOOL_F))); |
487 | thunk = scm_make_gsubr ("%deliver-signals", 0, 0, 0, | |
488 | sys_deliver_signals); | |
489 | signal_async = scm_system_async (thunk); | |
490 | ||
491 | for (i = 0; i < NSIG; i++) | |
492 | { | |
493 | got_signal[i] = 0; | |
494 | #ifdef HAVE_SIGACTION | |
495 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 496 | |
e1a191a8 GH |
497 | #else |
498 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 499 | #endif |
840ae05d | 500 | |
08b8c694 | 501 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce GH |
502 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
503 | signals really are restartable. don't rely on the same | |
504 | run-time that configure got: reset the default for every signal. | |
505 | */ | |
506 | #ifdef HAVE_SIGINTERRUPT | |
507 | siginterrupt (i, 0); | |
de881428 | 508 | #elif defined(SA_RESTART) |
840ae05d JB |
509 | { |
510 | struct sigaction action; | |
511 | ||
512 | sigaction (i, NULL, &action); | |
513 | if (!(action.sa_flags & SA_RESTART)) | |
514 | { | |
515 | action.sa_flags &= SA_RESTART; | |
516 | sigaction (i, &action, NULL); | |
517 | } | |
518 | } | |
7ee92fce GH |
519 | #endif |
520 | /* if neither siginterrupt nor SA_RESTART are available we may | |
521 | as well assume that signals are always restartable. */ | |
840ae05d | 522 | #endif |
e1a191a8 | 523 | } |
1cc91f1b | 524 | |
e1a191a8 GH |
525 | scm_sysintern ("NSIG", scm_long2num (NSIG)); |
526 | scm_sysintern ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
527 | scm_sysintern ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
528 | #ifdef SA_NOCLDSTOP | |
529 | scm_sysintern ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); | |
0f2d19dd | 530 | #endif |
e1a191a8 GH |
531 | #ifdef SA_RESTART |
532 | scm_sysintern ("SA_RESTART", scm_long2num (SA_RESTART)); | |
0f2d19dd | 533 | #endif |
1cc91f1b | 534 | |
a0599745 | 535 | #include "libguile/scmsigs.x" |
0f2d19dd JB |
536 | } |
537 | ||
89e00824 ML |
538 | |
539 | /* | |
540 | Local Variables: | |
541 | c-file-style: "gnu" | |
542 | End: | |
543 | */ |