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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> | |
49 | #include "_scm.h" | |
50 | ||
e1a191a8 GH |
51 | #include "async.h" |
52 | #include "eval.h" | |
003d1fd0 | 53 | #include "vectors.h" |
1bbd0b84 | 54 | |
b6791b2e | 55 | #include "validate.h" |
20e6290e JB |
56 | #include "scmsigs.h" |
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 | |
117 | static SIGRETTYPE (*orig_handlers)(int)[NSIG]; | |
0f2d19dd JB |
118 | #endif |
119 | ||
e1a191a8 GH |
120 | static SIGRETTYPE |
121 | take_signal (int signum) | |
122 | { | |
ee149d03 | 123 | int saved_errno = errno; |
e1a191a8 GH |
124 | SCM ignored; |
125 | if (!scm_ints_disabled) | |
126 | { | |
127 | /* For reasons of speed, the SCM_NEWCELL macro doesn't defer | |
128 | interrupts. Instead, it first sets its argument to point to | |
129 | the first cell in the list, and then advances the freelist | |
130 | pointer to the next cell. Now, if this procedure is | |
131 | interrupted, the only anomalous state possible is to have | |
132 | both SCM_NEWCELL's argument and scm_freelist pointing to the | |
133 | same cell. To deal with this case, we always throw away the | |
134 | first cell in scm_freelist here. | |
135 | ||
136 | At least, that's the theory. I'm not convinced that that's | |
137 | the only anomalous path we need to worry about. */ | |
138 | SCM_NEWCELL (ignored); | |
139 | } | |
140 | got_signal[signum] = 1; | |
141 | #if HAVE_SIGACTION | |
142 | /* unblock the signal before the scheme handler gets to run, since | |
143 | it may use longjmp to escape (i.e., throw an exception). */ | |
144 | { | |
145 | sigset_t set; | |
146 | sigemptyset (&set); | |
147 | sigaddset (&set, signum); | |
148 | sigprocmask (SIG_UNBLOCK, &set, NULL); | |
149 | } | |
150 | #endif | |
151 | scm_system_async_mark (signal_async); | |
ee149d03 | 152 | errno = saved_errno; |
e1a191a8 | 153 | } |
0f2d19dd | 154 | |
e1a191a8 GH |
155 | static SCM |
156 | sys_deliver_signals (void) | |
157 | { | |
158 | int i; | |
159 | ||
160 | for (i = 0; i < NSIG; i++) | |
161 | { | |
162 | if (got_signal[i]) | |
163 | { | |
cc0b3312 GH |
164 | /* The flag is reset before calling the handler in case the |
165 | handler doesn't return. If the handler doesn't return | |
166 | but leaves other signals flagged, they their handlers | |
167 | will be applied some time later when the async is checked | |
168 | again. It would probably be better to reset the flags | |
169 | after doing a longjmp. */ | |
e1a191a8 GH |
170 | got_signal[i] = 0; |
171 | #ifndef HAVE_SIGACTION | |
172 | signal (i, take_signal); | |
173 | #endif | |
2ad6b1a5 GH |
174 | scm_apply (SCM_VELTS (*signal_handlers)[i], |
175 | scm_listify (SCM_MAKINUM (i), SCM_UNDEFINED), | |
176 | SCM_EOL); | |
e1a191a8 GH |
177 | } |
178 | } | |
179 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
180 | } |
181 | ||
e1a191a8 | 182 | /* user interface for installation of signal handlers. */ |
3b3b36dd | 183 | SCM_DEFINE (scm_sigaction, "sigaction", 1, 2, 0, |
1bbd0b84 | 184 | (SCM signum, SCM handler, SCM flags), |
b380b885 MD |
185 | "Install or report the signal hander for a specified signal.\n\n" |
186 | "@var{signum} is the signal number, which can be specified using the value\n" | |
187 | "of variables such as @code{SIGINT}.\n\n" | |
188 | "If @var{action} is omitted, @code{sigaction} returns a pair: the\n" | |
189 | "CAR is the current\n" | |
190 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
191 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
192 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
193 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
194 | "If @var{action} is provided, it is installed as the new handler for\n" | |
195 | "@var{signum}. @var{action} can be a Scheme procedure taking one\n" | |
196 | "argument, or the value of @code{SIG_DFL} (default action) or\n" | |
197 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
198 | "was installed before @code{sigaction} was first used. Flags can\n" | |
199 | "optionally be specified for the new handler (@code{SA_RESTART} will\n" | |
200 | "always be added if it's available and the system is using rstartable\n" | |
201 | "system calls.) The return value is a pair with information about the\n" | |
202 | "old handler as described above.\n\n" | |
203 | "This interface does not provide access to the \"signal blocking\"\n" | |
204 | "facility. Maybe this is not needed, since the thread support may\n" | |
205 | "provide solutions to the problem of consistent access to data\n" | |
206 | "structures.") | |
1bbd0b84 | 207 | #define FUNC_NAME s_scm_sigaction |
e1a191a8 GH |
208 | { |
209 | int csig; | |
210 | #ifdef HAVE_SIGACTION | |
211 | struct sigaction action; | |
212 | struct sigaction old_action; | |
213 | #else | |
214 | SIGRETTYPE (* chandler) (int); | |
215 | SIGRETTYPE (* old_chandler) (int); | |
216 | #endif | |
217 | int query_only = 0; | |
218 | int save_handler = 0; | |
219 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
220 | SCM old_handler; | |
221 | ||
3b3b36dd | 222 | SCM_VALIDATE_INUM_COPY (1,signum,csig); |
7ee92fce GH |
223 | #if defined(HAVE_SIGACTION) |
224 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
225 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
226 | is defined, since libguile would be likely to produce spurious | |
227 | EINTR errors. */ | |
e1a191a8 GH |
228 | action.sa_flags = SA_RESTART; |
229 | #else | |
230 | action.sa_flags = 0; | |
231 | #endif | |
232 | if (!SCM_UNBNDP (flags)) | |
233 | { | |
3b3b36dd | 234 | SCM_VALIDATE_INUM (3,flags); |
e1a191a8 GH |
235 | action.sa_flags |= SCM_INUM (flags); |
236 | } | |
237 | sigemptyset (&action.sa_mask); | |
238 | #endif | |
239 | SCM_DEFER_INTS; | |
240 | old_handler = scheme_handlers[csig]; | |
241 | if (SCM_UNBNDP (handler)) | |
242 | query_only = 1; | |
7ee92fce | 243 | else if (scm_integer_p (handler) == SCM_BOOL_T) |
e1a191a8 | 244 | { |
1bbd0b84 GB |
245 | if (SCM_NUM2LONG (2,handler) == (long) SIG_DFL |
246 | || SCM_NUM2LONG (2,handler) == (long) SIG_IGN) | |
e1a191a8 GH |
247 | { |
248 | #ifdef HAVE_SIGACTION | |
249 | action.sa_handler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
250 | #else | |
251 | chandler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
252 | #endif | |
253 | scheme_handlers[csig] = SCM_BOOL_F; | |
254 | } | |
255 | else | |
1bbd0b84 | 256 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 GH |
257 | } |
258 | else if (SCM_FALSEP (handler)) | |
259 | { | |
260 | /* restore the default handler. */ | |
261 | #ifdef HAVE_SIGACTION | |
262 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
263 | query_only = 1; | |
264 | else | |
265 | { | |
266 | action = orig_handlers[csig]; | |
267 | orig_handlers[csig].sa_handler = SIG_ERR; | |
268 | scheme_handlers[csig] = SCM_BOOL_F; | |
269 | } | |
270 | #else | |
271 | if (orig_handlers[csig] == SIG_ERR) | |
272 | query_only = 1; | |
273 | else | |
274 | { | |
275 | chandler = orig_handlers[csig]; | |
276 | orig_handlers[csig] = SIG_ERR; | |
277 | scheme_handlers[csig] = SCM_BOOL_F; | |
278 | } | |
279 | #endif | |
280 | } | |
281 | else | |
282 | { | |
6b5a304f | 283 | SCM_VALIDATE_NIM (2,handler); |
e1a191a8 GH |
284 | #ifdef HAVE_SIGACTION |
285 | action.sa_handler = take_signal; | |
286 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
287 | save_handler = 1; | |
288 | #else | |
289 | chandler = take_signal; | |
290 | if (orig_handlers[csig] == SIG_ERR) | |
291 | save_handler = 1; | |
292 | #endif | |
293 | scheme_handlers[csig] = handler; | |
294 | } | |
295 | #ifdef HAVE_SIGACTION | |
296 | if (query_only) | |
297 | { | |
298 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 299 | SCM_SYSERROR; |
e1a191a8 GH |
300 | } |
301 | else | |
302 | { | |
303 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 304 | SCM_SYSERROR; |
e1a191a8 GH |
305 | if (save_handler) |
306 | orig_handlers[csig] = old_action; | |
307 | } | |
308 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 309 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 GH |
310 | SCM_ALLOW_INTS; |
311 | return scm_cons (old_handler, SCM_MAKINUM (old_action.sa_flags)); | |
312 | #else | |
313 | if (query_only) | |
314 | { | |
315 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 316 | SCM_SYSERROR; |
e1a191a8 | 317 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 318 | SCM_SYSERROR; |
e1a191a8 GH |
319 | } |
320 | else | |
321 | { | |
322 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 323 | SCM_SYSERROR; |
e1a191a8 GH |
324 | if (save_handler) |
325 | orig_handlers[csig] = old_chandler; | |
326 | } | |
327 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
7ee92fce | 328 | old_handler = scm_long2num (old_chandler); |
e1a191a8 GH |
329 | SCM_ALLOW_INTS; |
330 | return scm_cons (old_handler, SCM_MAKINUM (0)); | |
0f2d19dd | 331 | #endif |
e1a191a8 | 332 | } |
1bbd0b84 | 333 | #undef FUNC_NAME |
e1a191a8 | 334 | |
a1ec6916 | 335 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 336 | (void), |
b380b885 MD |
337 | "Return all signal handlers to the values they had before any call to\n" |
338 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 339 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
340 | { |
341 | int i; | |
342 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
343 | ||
344 | for (i = 0; i < NSIG; i++) | |
345 | { | |
346 | #ifdef HAVE_SIGACTION | |
347 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
348 | { | |
349 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 350 | SCM_SYSERROR; |
e1a191a8 GH |
351 | orig_handlers[i].sa_handler = SIG_ERR; |
352 | scheme_handlers[i] = SCM_BOOL_F; | |
353 | } | |
354 | #else | |
355 | if (orig_handlers[i] != SIG_ERR) | |
356 | { | |
357 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 358 | SCM_SYSERROR; |
e1a191a8 GH |
359 | orig_handlers[i] = SIG_ERR; |
360 | scheme_handlers[i] = SCM_BOOL_F; | |
361 | } | |
362 | #endif | |
363 | } | |
364 | return SCM_UNSPECIFIED; | |
365 | } | |
1bbd0b84 | 366 | #undef FUNC_NAME |
0f2d19dd | 367 | |
3b3b36dd | 368 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 369 | (SCM i), |
b380b885 MD |
370 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
371 | "number of seconds (an integer). It's advisable to install a signal\n" | |
372 | "handler for\n" | |
373 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
374 | "the process.\n\n" | |
375 | "The return value indicates the time remaining for the previous alarm,\n" | |
376 | "if any. The new value replaces the previous alarm. If there was\n" | |
377 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 378 | #define FUNC_NAME s_scm_alarm |
0f2d19dd JB |
379 | { |
380 | unsigned int j; | |
3b3b36dd | 381 | SCM_VALIDATE_INUM (1,i); |
e1a191a8 | 382 | j = alarm (SCM_INUM (i)); |
0f2d19dd JB |
383 | return SCM_MAKINUM (j); |
384 | } | |
1bbd0b84 | 385 | #undef FUNC_NAME |
0f2d19dd | 386 | |
0e958795 | 387 | #ifdef HAVE_PAUSE |
3b3b36dd | 388 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 389 | (), |
b380b885 MD |
390 | "Pause the current process (thread?) until a signal arrives whose\n" |
391 | "action is to either terminate the current process or invoke a\n" | |
392 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 393 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
394 | { |
395 | pause (); | |
396 | return SCM_UNSPECIFIED; | |
397 | } | |
1bbd0b84 | 398 | #undef FUNC_NAME |
0e958795 | 399 | #endif |
0f2d19dd | 400 | |
3b3b36dd | 401 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 402 | (SCM i), |
b380b885 MD |
403 | "Wait for the given number of seconds (an integer) or until a signal\n" |
404 | "arrives. The return value is zero if the time elapses or the number\n" | |
405 | "of seconds remaining otherwise.") | |
1bbd0b84 | 406 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 407 | { |
b74f4728 | 408 | unsigned long j; |
3b3b36dd | 409 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
410 | #ifdef USE_THREADS |
411 | j = scm_thread_sleep (SCM_INUM(i)); | |
412 | #else | |
e1a191a8 | 413 | j = sleep (SCM_INUM(i)); |
b74f4728 JB |
414 | #endif |
415 | return scm_ulong2num (j); | |
0f2d19dd | 416 | } |
1bbd0b84 | 417 | #undef FUNC_NAME |
0f2d19dd | 418 | |
b74f4728 | 419 | #if defined(USE_THREADS) || defined(HAVE_USLEEP) |
3b3b36dd | 420 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 421 | (SCM i), |
b450f070 GB |
422 | "Sleep for I microseconds.\n" |
423 | "`usleep' is not available on all platforms.") | |
1bbd0b84 | 424 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 425 | { |
3b3b36dd | 426 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
427 | |
428 | #ifdef USE_THREADS | |
429 | /* If we have threads, we use the thread system's sleep function. */ | |
430 | { | |
431 | unsigned long j = scm_thread_usleep (SCM_INUM (i)); | |
432 | return scm_ulong2num (j); | |
433 | } | |
434 | #else | |
0935d604 MD |
435 | #ifdef USLEEP_RETURNS_VOID |
436 | usleep (SCM_INUM (i)); | |
437 | return SCM_INUM0; | |
438 | #else | |
b74f4728 JB |
439 | { |
440 | int j = usleep (SCM_INUM (i)); | |
441 | return SCM_MAKINUM (j); | |
442 | } | |
0935d604 | 443 | #endif |
ce874f2d | 444 | #endif |
b74f4728 | 445 | } |
1bbd0b84 | 446 | #undef FUNC_NAME |
b74f4728 | 447 | #endif /* GUILE_ISELECT || HAVE_USLEEP */ |
ce874f2d | 448 | |
3b3b36dd | 449 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 450 | (SCM sig), |
b380b885 MD |
451 | "\n" |
452 | "Sends a specified signal @var{sig} to the current process, where\n" | |
453 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 454 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 455 | { |
3b3b36dd | 456 | SCM_VALIDATE_INUM (1,sig); |
e1a191a8 GH |
457 | SCM_DEFER_INTS; |
458 | if (kill (getpid (), (int) SCM_INUM (sig)) != 0) | |
1bbd0b84 | 459 | SCM_SYSERROR; |
e1a191a8 GH |
460 | SCM_ALLOW_INTS; |
461 | return SCM_UNSPECIFIED; | |
0f2d19dd | 462 | } |
1bbd0b84 | 463 | #undef FUNC_NAME |
0f2d19dd JB |
464 | |
465 | \f | |
0f2d19dd | 466 | |
e1a191a8 GH |
467 | void |
468 | scm_init_scmsigs () | |
0f2d19dd | 469 | { |
e1a191a8 GH |
470 | SCM thunk; |
471 | int i; | |
472 | ||
473 | signal_handlers = | |
474 | SCM_CDRLOC (scm_sysintern ("signal-handlers", | |
475 | scm_make_vector (SCM_MAKINUM (NSIG), | |
e1a191a8 GH |
476 | SCM_BOOL_F))); |
477 | thunk = scm_make_gsubr ("%deliver-signals", 0, 0, 0, | |
478 | sys_deliver_signals); | |
479 | signal_async = scm_system_async (thunk); | |
480 | ||
481 | for (i = 0; i < NSIG; i++) | |
482 | { | |
483 | got_signal[i] = 0; | |
484 | #ifdef HAVE_SIGACTION | |
485 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 486 | |
e1a191a8 GH |
487 | #else |
488 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 489 | #endif |
840ae05d | 490 | |
08b8c694 | 491 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce GH |
492 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
493 | signals really are restartable. don't rely on the same | |
494 | run-time that configure got: reset the default for every signal. | |
495 | */ | |
496 | #ifdef HAVE_SIGINTERRUPT | |
497 | siginterrupt (i, 0); | |
de881428 | 498 | #elif defined(SA_RESTART) |
840ae05d JB |
499 | { |
500 | struct sigaction action; | |
501 | ||
502 | sigaction (i, NULL, &action); | |
503 | if (!(action.sa_flags & SA_RESTART)) | |
504 | { | |
505 | action.sa_flags &= SA_RESTART; | |
506 | sigaction (i, &action, NULL); | |
507 | } | |
508 | } | |
7ee92fce GH |
509 | #endif |
510 | /* if neither siginterrupt nor SA_RESTART are available we may | |
511 | as well assume that signals are always restartable. */ | |
840ae05d | 512 | #endif |
e1a191a8 | 513 | } |
1cc91f1b | 514 | |
e1a191a8 GH |
515 | scm_sysintern ("NSIG", scm_long2num (NSIG)); |
516 | scm_sysintern ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
517 | scm_sysintern ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
518 | #ifdef SA_NOCLDSTOP | |
519 | scm_sysintern ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); | |
0f2d19dd | 520 | #endif |
e1a191a8 GH |
521 | #ifdef SA_RESTART |
522 | scm_sysintern ("SA_RESTART", scm_long2num (SA_RESTART)); | |
0f2d19dd | 523 | #endif |
1cc91f1b | 524 | |
0f2d19dd JB |
525 | #include "scmsigs.x" |
526 | } | |
527 |