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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" | |
1bbd0b84 GB |
53 | |
54 | #include "scm_validate.h" | |
20e6290e JB |
55 | #include "scmsigs.h" |
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 | ||
317607b0 MD |
76 | #ifdef USE_MIT_PTHREADS |
77 | #undef signal | |
78 | #define signal pthread_signal | |
79 | #endif | |
80 | ||
0f2d19dd JB |
81 | \f |
82 | ||
e1a191a8 | 83 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
84 | |
85 | #ifdef RETSIGTYPE | |
e1a191a8 | 86 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 87 | #else |
e1a191a8 GH |
88 | # ifdef STDC_HEADERS |
89 | # define SIGRETTYPE void | |
90 | # else | |
91 | # define SIGRETTYPE int | |
92 | # endif | |
0f2d19dd JB |
93 | #endif |
94 | ||
95 | \f | |
96 | ||
e1a191a8 GH |
97 | /* take_signal is installed as the C signal handler whenever a Scheme |
98 | handler is set. when a signal arrives, take_signal marks the corresponding | |
99 | element of got_signal and marks signal_async. the thunk in signal_async | |
100 | (sys_deliver_signals) will be run at the next opportunity, outside a | |
101 | critical section. sys_deliver_signals runs each Scheme handler for | |
102 | which got_signal is set. */ | |
0f2d19dd | 103 | |
e1a191a8 | 104 | static SCM signal_async; |
0f2d19dd | 105 | |
e1a191a8 | 106 | static char got_signal[NSIG]; |
0f2d19dd | 107 | |
e1a191a8 GH |
108 | /* a Scheme vector of handler procedures. */ |
109 | static SCM *signal_handlers; | |
0f2d19dd | 110 | |
e1a191a8 GH |
111 | /* saves the original C handlers, when a new handler is installed. |
112 | set to SIG_ERR if the original handler is installed. */ | |
113 | #ifdef HAVE_SIGACTION | |
114 | static struct sigaction orig_handlers[NSIG]; | |
115 | #else | |
116 | static SIGRETTYPE (*orig_handlers)(int)[NSIG]; | |
0f2d19dd JB |
117 | #endif |
118 | ||
e1a191a8 GH |
119 | static SIGRETTYPE |
120 | take_signal (int signum) | |
121 | { | |
ee149d03 | 122 | int saved_errno = errno; |
e1a191a8 GH |
123 | SCM ignored; |
124 | if (!scm_ints_disabled) | |
125 | { | |
126 | /* For reasons of speed, the SCM_NEWCELL macro doesn't defer | |
127 | interrupts. Instead, it first sets its argument to point to | |
128 | the first cell in the list, and then advances the freelist | |
129 | pointer to the next cell. Now, if this procedure is | |
130 | interrupted, the only anomalous state possible is to have | |
131 | both SCM_NEWCELL's argument and scm_freelist pointing to the | |
132 | same cell. To deal with this case, we always throw away the | |
133 | first cell in scm_freelist here. | |
134 | ||
135 | At least, that's the theory. I'm not convinced that that's | |
136 | the only anomalous path we need to worry about. */ | |
137 | SCM_NEWCELL (ignored); | |
138 | } | |
139 | got_signal[signum] = 1; | |
140 | #if HAVE_SIGACTION | |
141 | /* unblock the signal before the scheme handler gets to run, since | |
142 | it may use longjmp to escape (i.e., throw an exception). */ | |
143 | { | |
144 | sigset_t set; | |
145 | sigemptyset (&set); | |
146 | sigaddset (&set, signum); | |
147 | sigprocmask (SIG_UNBLOCK, &set, NULL); | |
148 | } | |
149 | #endif | |
150 | scm_system_async_mark (signal_async); | |
ee149d03 | 151 | errno = saved_errno; |
e1a191a8 | 152 | } |
0f2d19dd | 153 | |
e1a191a8 GH |
154 | static SCM |
155 | sys_deliver_signals (void) | |
156 | { | |
157 | int i; | |
158 | ||
159 | for (i = 0; i < NSIG; i++) | |
160 | { | |
161 | if (got_signal[i]) | |
162 | { | |
cc0b3312 GH |
163 | /* The flag is reset before calling the handler in case the |
164 | handler doesn't return. If the handler doesn't return | |
165 | but leaves other signals flagged, they their handlers | |
166 | will be applied some time later when the async is checked | |
167 | again. It would probably be better to reset the flags | |
168 | after doing a longjmp. */ | |
e1a191a8 GH |
169 | got_signal[i] = 0; |
170 | #ifndef HAVE_SIGACTION | |
171 | signal (i, take_signal); | |
172 | #endif | |
2ad6b1a5 GH |
173 | scm_apply (SCM_VELTS (*signal_handlers)[i], |
174 | scm_listify (SCM_MAKINUM (i), SCM_UNDEFINED), | |
175 | SCM_EOL); | |
e1a191a8 GH |
176 | } |
177 | } | |
178 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
179 | } |
180 | ||
e1a191a8 | 181 | /* user interface for installation of signal handlers. */ |
a1ec6916 | 182 | SCM_DEFINE(scm_sigaction, "sigaction", 1, 2, 0, |
1bbd0b84 | 183 | (SCM signum, SCM handler, SCM flags), |
4079f87e GB |
184 | "Install or report the signal hander for a specified signal. |
185 | ||
186 | @var{signum} is the signal number, which can be specified using the value | |
187 | of variables such as @code{SIGINT}. | |
188 | ||
189 | If @var{action} is omitted, @code{sigaction} returns a pair: the | |
190 | CAR is the current | |
191 | signal hander, which will be either an integer with the value @code{SIG_DFL} | |
192 | (default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which | |
193 | handles the signal, or @code{#f} if a non-Scheme procedure handles the | |
194 | signal. The CDR contains the current @code{sigaction} flags for the handler. | |
195 | ||
196 | If @var{action} is provided, it is installed as the new handler for | |
197 | @var{signum}. @var{action} can be a Scheme procedure taking one | |
198 | argument, or the value of @code{SIG_DFL} (default action) or | |
199 | @code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler | |
200 | was installed before @code{sigaction} was first used. Flags can | |
201 | optionally be specified for the new handler (@code{SA_RESTART} will | |
202 | always be added if it's available and the system is using rstartable | |
203 | system calls.) The return value is a pair with information about the | |
204 | old handler as described above. | |
205 | ||
206 | This interface does not provide access to the \"signal blocking\" | |
207 | facility. Maybe this is not needed, since the thread support may | |
208 | provide solutions to the problem of consistent access to data | |
209 | structures.") | |
1bbd0b84 | 210 | #define FUNC_NAME s_scm_sigaction |
e1a191a8 GH |
211 | { |
212 | int csig; | |
213 | #ifdef HAVE_SIGACTION | |
214 | struct sigaction action; | |
215 | struct sigaction old_action; | |
216 | #else | |
217 | SIGRETTYPE (* chandler) (int); | |
218 | SIGRETTYPE (* old_chandler) (int); | |
219 | #endif | |
220 | int query_only = 0; | |
221 | int save_handler = 0; | |
222 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
223 | SCM old_handler; | |
224 | ||
47c6b75e | 225 | SCM_VALIDATE_INUM_COPY(1,signum,csig); |
7ee92fce GH |
226 | #if defined(HAVE_SIGACTION) |
227 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
228 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
229 | is defined, since libguile would be likely to produce spurious | |
230 | EINTR errors. */ | |
e1a191a8 GH |
231 | action.sa_flags = SA_RESTART; |
232 | #else | |
233 | action.sa_flags = 0; | |
234 | #endif | |
235 | if (!SCM_UNBNDP (flags)) | |
236 | { | |
47c6b75e | 237 | SCM_VALIDATE_INUM(3,flags); |
e1a191a8 GH |
238 | action.sa_flags |= SCM_INUM (flags); |
239 | } | |
240 | sigemptyset (&action.sa_mask); | |
241 | #endif | |
242 | SCM_DEFER_INTS; | |
243 | old_handler = scheme_handlers[csig]; | |
244 | if (SCM_UNBNDP (handler)) | |
245 | query_only = 1; | |
7ee92fce | 246 | else if (scm_integer_p (handler) == SCM_BOOL_T) |
e1a191a8 | 247 | { |
1bbd0b84 GB |
248 | if (SCM_NUM2LONG (2,handler) == (long) SIG_DFL |
249 | || SCM_NUM2LONG (2,handler) == (long) SIG_IGN) | |
e1a191a8 GH |
250 | { |
251 | #ifdef HAVE_SIGACTION | |
252 | action.sa_handler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
253 | #else | |
254 | chandler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
255 | #endif | |
256 | scheme_handlers[csig] = SCM_BOOL_F; | |
257 | } | |
258 | else | |
1bbd0b84 | 259 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 GH |
260 | } |
261 | else if (SCM_FALSEP (handler)) | |
262 | { | |
263 | /* restore the default handler. */ | |
264 | #ifdef HAVE_SIGACTION | |
265 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
266 | query_only = 1; | |
267 | else | |
268 | { | |
269 | action = orig_handlers[csig]; | |
270 | orig_handlers[csig].sa_handler = SIG_ERR; | |
271 | scheme_handlers[csig] = SCM_BOOL_F; | |
272 | } | |
273 | #else | |
274 | if (orig_handlers[csig] == SIG_ERR) | |
275 | query_only = 1; | |
276 | else | |
277 | { | |
278 | chandler = orig_handlers[csig]; | |
279 | orig_handlers[csig] = SIG_ERR; | |
280 | scheme_handlers[csig] = SCM_BOOL_F; | |
281 | } | |
282 | #endif | |
283 | } | |
284 | else | |
285 | { | |
6b5a304f | 286 | SCM_VALIDATE_NIM (2,handler); |
e1a191a8 GH |
287 | #ifdef HAVE_SIGACTION |
288 | action.sa_handler = take_signal; | |
289 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
290 | save_handler = 1; | |
291 | #else | |
292 | chandler = take_signal; | |
293 | if (orig_handlers[csig] == SIG_ERR) | |
294 | save_handler = 1; | |
295 | #endif | |
296 | scheme_handlers[csig] = handler; | |
297 | } | |
298 | #ifdef HAVE_SIGACTION | |
299 | if (query_only) | |
300 | { | |
301 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 302 | SCM_SYSERROR; |
e1a191a8 GH |
303 | } |
304 | else | |
305 | { | |
306 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 307 | SCM_SYSERROR; |
e1a191a8 GH |
308 | if (save_handler) |
309 | orig_handlers[csig] = old_action; | |
310 | } | |
311 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 312 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 GH |
313 | SCM_ALLOW_INTS; |
314 | return scm_cons (old_handler, SCM_MAKINUM (old_action.sa_flags)); | |
315 | #else | |
316 | if (query_only) | |
317 | { | |
318 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 319 | SCM_SYSERROR; |
e1a191a8 | 320 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 321 | SCM_SYSERROR; |
e1a191a8 GH |
322 | } |
323 | else | |
324 | { | |
325 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 326 | SCM_SYSERROR; |
e1a191a8 GH |
327 | if (save_handler) |
328 | orig_handlers[csig] = old_chandler; | |
329 | } | |
330 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
7ee92fce | 331 | old_handler = scm_long2num (old_chandler); |
e1a191a8 GH |
332 | SCM_ALLOW_INTS; |
333 | return scm_cons (old_handler, SCM_MAKINUM (0)); | |
0f2d19dd | 334 | #endif |
e1a191a8 | 335 | } |
1bbd0b84 | 336 | #undef FUNC_NAME |
e1a191a8 | 337 | |
a1ec6916 | 338 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 339 | (void), |
4079f87e GB |
340 | "Return all signal handlers to the values they had before any call to |
341 | @code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 342 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
343 | { |
344 | int i; | |
345 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
346 | ||
347 | for (i = 0; i < NSIG; i++) | |
348 | { | |
349 | #ifdef HAVE_SIGACTION | |
350 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
351 | { | |
352 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 353 | SCM_SYSERROR; |
e1a191a8 GH |
354 | orig_handlers[i].sa_handler = SIG_ERR; |
355 | scheme_handlers[i] = SCM_BOOL_F; | |
356 | } | |
357 | #else | |
358 | if (orig_handlers[i] != SIG_ERR) | |
359 | { | |
360 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 361 | SCM_SYSERROR; |
e1a191a8 GH |
362 | orig_handlers[i] = SIG_ERR; |
363 | scheme_handlers[i] = SCM_BOOL_F; | |
364 | } | |
365 | #endif | |
366 | } | |
367 | return SCM_UNSPECIFIED; | |
368 | } | |
1bbd0b84 | 369 | #undef FUNC_NAME |
0f2d19dd | 370 | |
a1ec6916 | 371 | SCM_DEFINE(scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 372 | (SCM i), |
4079f87e GB |
373 | "Set a timer to raise a @code{SIGALRM} signal after the specified |
374 | number of seconds (an integer). It's advisable to install a signal | |
375 | handler for | |
376 | @code{SIGALRM} beforehand, since the default action is to terminate | |
377 | the process. | |
378 | ||
379 | The return value indicates the time remaining for the previous alarm, | |
380 | if any. The new value replaces the previous alarm. If there was | |
381 | no previous alarm, the return value is zero.") | |
1bbd0b84 | 382 | #define FUNC_NAME s_scm_alarm |
0f2d19dd JB |
383 | { |
384 | unsigned int j; | |
47c6b75e | 385 | SCM_VALIDATE_INUM(1,i); |
e1a191a8 | 386 | j = alarm (SCM_INUM (i)); |
0f2d19dd JB |
387 | return SCM_MAKINUM (j); |
388 | } | |
1bbd0b84 | 389 | #undef FUNC_NAME |
0f2d19dd | 390 | |
0e958795 | 391 | #ifdef HAVE_PAUSE |
a1ec6916 | 392 | SCM_DEFINE(scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 393 | (), |
4079f87e GB |
394 | "Pause the current process (thread?) until a signal arrives whose |
395 | action is to either terminate the current process or invoke a | |
396 | handler procedure. The return value is unspecified.") | |
1bbd0b84 | 397 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
398 | { |
399 | pause (); | |
400 | return SCM_UNSPECIFIED; | |
401 | } | |
1bbd0b84 | 402 | #undef FUNC_NAME |
0e958795 | 403 | #endif |
0f2d19dd | 404 | |
a1ec6916 | 405 | SCM_DEFINE(scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 406 | (SCM i), |
4079f87e GB |
407 | "Wait for the given number of seconds (an integer) or until a signal |
408 | arrives. The return value is zero if the time elapses or the number | |
409 | of seconds remaining otherwise.") | |
1bbd0b84 | 410 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 411 | { |
b74f4728 | 412 | unsigned long j; |
47c6b75e | 413 | SCM_VALIDATE_INUM_MIN(1,i,0); |
b74f4728 JB |
414 | #ifdef USE_THREADS |
415 | j = scm_thread_sleep (SCM_INUM(i)); | |
416 | #else | |
e1a191a8 | 417 | j = sleep (SCM_INUM(i)); |
b74f4728 JB |
418 | #endif |
419 | return scm_ulong2num (j); | |
0f2d19dd | 420 | } |
1bbd0b84 | 421 | #undef FUNC_NAME |
0f2d19dd | 422 | |
b74f4728 | 423 | #if defined(USE_THREADS) || defined(HAVE_USLEEP) |
a1ec6916 | 424 | SCM_DEFINE(scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 GB |
425 | (SCM i), |
426 | "") | |
427 | #define FUNC_NAME s_scm_usleep | |
ce874f2d | 428 | { |
47c6b75e | 429 | SCM_VALIDATE_INUM_MIN(1,i,0); |
b74f4728 JB |
430 | |
431 | #ifdef USE_THREADS | |
432 | /* If we have threads, we use the thread system's sleep function. */ | |
433 | { | |
434 | unsigned long j = scm_thread_usleep (SCM_INUM (i)); | |
435 | return scm_ulong2num (j); | |
436 | } | |
437 | #else | |
0935d604 MD |
438 | #ifdef USLEEP_RETURNS_VOID |
439 | usleep (SCM_INUM (i)); | |
440 | return SCM_INUM0; | |
441 | #else | |
b74f4728 JB |
442 | { |
443 | int j = usleep (SCM_INUM (i)); | |
444 | return SCM_MAKINUM (j); | |
445 | } | |
0935d604 | 446 | #endif |
ce874f2d | 447 | #endif |
b74f4728 | 448 | } |
1bbd0b84 | 449 | #undef FUNC_NAME |
b74f4728 | 450 | #endif /* GUILE_ISELECT || HAVE_USLEEP */ |
ce874f2d | 451 | |
a1ec6916 | 452 | SCM_DEFINE(scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 453 | (SCM sig), |
4079f87e GB |
454 | " |
455 | Sends a specified signal @var{sig} to the current process, where | |
456 | @var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 457 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 458 | { |
47c6b75e | 459 | SCM_VALIDATE_INUM(1,sig); |
e1a191a8 GH |
460 | SCM_DEFER_INTS; |
461 | if (kill (getpid (), (int) SCM_INUM (sig)) != 0) | |
1bbd0b84 | 462 | SCM_SYSERROR; |
e1a191a8 GH |
463 | SCM_ALLOW_INTS; |
464 | return SCM_UNSPECIFIED; | |
0f2d19dd | 465 | } |
1bbd0b84 | 466 | #undef FUNC_NAME |
0f2d19dd JB |
467 | |
468 | \f | |
0f2d19dd | 469 | |
e1a191a8 GH |
470 | void |
471 | scm_init_scmsigs () | |
0f2d19dd | 472 | { |
e1a191a8 GH |
473 | SCM thunk; |
474 | int i; | |
475 | ||
476 | signal_handlers = | |
477 | SCM_CDRLOC (scm_sysintern ("signal-handlers", | |
478 | scm_make_vector (SCM_MAKINUM (NSIG), | |
e1a191a8 GH |
479 | SCM_BOOL_F))); |
480 | thunk = scm_make_gsubr ("%deliver-signals", 0, 0, 0, | |
481 | sys_deliver_signals); | |
482 | signal_async = scm_system_async (thunk); | |
483 | ||
484 | for (i = 0; i < NSIG; i++) | |
485 | { | |
486 | got_signal[i] = 0; | |
487 | #ifdef HAVE_SIGACTION | |
488 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 489 | |
e1a191a8 GH |
490 | #else |
491 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 492 | #endif |
840ae05d | 493 | |
08b8c694 | 494 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce GH |
495 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
496 | signals really are restartable. don't rely on the same | |
497 | run-time that configure got: reset the default for every signal. | |
498 | */ | |
499 | #ifdef HAVE_SIGINTERRUPT | |
500 | siginterrupt (i, 0); | |
de881428 | 501 | #elif defined(SA_RESTART) |
840ae05d JB |
502 | { |
503 | struct sigaction action; | |
504 | ||
505 | sigaction (i, NULL, &action); | |
506 | if (!(action.sa_flags & SA_RESTART)) | |
507 | { | |
508 | action.sa_flags &= SA_RESTART; | |
509 | sigaction (i, &action, NULL); | |
510 | } | |
511 | } | |
7ee92fce GH |
512 | #endif |
513 | /* if neither siginterrupt nor SA_RESTART are available we may | |
514 | as well assume that signals are always restartable. */ | |
840ae05d | 515 | #endif |
e1a191a8 | 516 | } |
1cc91f1b | 517 | |
e1a191a8 GH |
518 | scm_sysintern ("NSIG", scm_long2num (NSIG)); |
519 | scm_sysintern ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
520 | scm_sysintern ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
521 | #ifdef SA_NOCLDSTOP | |
522 | scm_sysintern ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); | |
0f2d19dd | 523 | #endif |
e1a191a8 GH |
524 | #ifdef SA_RESTART |
525 | scm_sysintern ("SA_RESTART", scm_long2num (SA_RESTART)); | |
0f2d19dd | 526 | #endif |
1cc91f1b | 527 | |
0f2d19dd JB |
528 | #include "scmsigs.x" |
529 | } | |
530 |