Commit | Line | Data |
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cdd125e8 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2004, 2006, 2007, 2008, 2009, 2011, 2013 Free Software Foundation, Inc. |
adb2c53b | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
adb2c53b | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
adb2c53b | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
0f2d19dd JB |
20 | \f |
21 | ||
dbb605f5 | 22 | #ifdef HAVE_CONFIG_H |
29d36c2d RB |
23 | # include <config.h> |
24 | #endif | |
25 | ||
23d72566 | 26 | #include <fcntl.h> /* for mingw */ |
0f2d19dd | 27 | #include <signal.h> |
9de87eea | 28 | #include <stdio.h> |
e6e2e95a MD |
29 | #include <errno.h> |
30 | ||
23d72566 KR |
31 | #ifdef HAVE_PROCESS_H |
32 | #include <process.h> /* for mingw */ | |
33 | #endif | |
34 | ||
0f2d19dd JB |
35 | #ifdef HAVE_UNISTD_H |
36 | #include <unistd.h> | |
37 | #endif | |
38 | ||
1bed8c28 GH |
39 | #ifdef HAVE_SYS_TIME_H |
40 | #include <sys/time.h> | |
41 | #endif | |
42 | ||
634aa8de LC |
43 | #include <full-write.h> |
44 | ||
cdd125e8 AW |
45 | #include "libguile/_scm.h" |
46 | ||
47 | #include "libguile/async.h" | |
48 | #include "libguile/eval.h" | |
49 | #include "libguile/root.h" | |
50 | #include "libguile/vectors.h" | |
51 | #include "libguile/threads.h" | |
52 | ||
53 | #include "libguile/validate.h" | |
54 | #include "libguile/scmsigs.h" | |
55 | ||
634aa8de | 56 | |
0f2d19dd JB |
57 | \f |
58 | ||
e1a191a8 | 59 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
60 | |
61 | #ifdef RETSIGTYPE | |
e1a191a8 | 62 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 63 | #else |
e1a191a8 GH |
64 | # ifdef STDC_HEADERS |
65 | # define SIGRETTYPE void | |
66 | # else | |
67 | # define SIGRETTYPE int | |
68 | # endif | |
0f2d19dd JB |
69 | #endif |
70 | ||
71 | \f | |
72 | ||
e1a191a8 | 73 | /* take_signal is installed as the C signal handler whenever a Scheme |
9de87eea MV |
74 | handler is set. When a signal arrives, take_signal will write a |
75 | byte into the 'signal pipe'. The 'signal delivery thread' will | |
76 | read this pipe and queue the appropriate asyncs. | |
77 | ||
78 | When Guile is built without threads, the signal handler will | |
79 | install the async directly. | |
80 | */ | |
0f2d19dd | 81 | |
0f2d19dd | 82 | |
2fbc8609 | 83 | /* Scheme vectors with information about a signal. signal_handlers |
9de87eea MV |
84 | contains the handler procedure or #f, signal_handler_asyncs |
85 | contains the thunk to be marked as an async when the signal arrives | |
86 | (or the cell with the thunk in a singlethreaded Guile), and | |
dbbaa07c MV |
87 | signal_handler_threads points to the thread that a signal should be |
88 | delivered to. | |
2fbc8609 | 89 | */ |
e1a191a8 | 90 | static SCM *signal_handlers; |
9de87eea | 91 | static SCM signal_handler_asyncs; |
2fbc8609 | 92 | static SCM signal_handler_threads; |
0f2d19dd | 93 | |
2e77f720 LC |
94 | /* The signal delivery thread. */ |
95 | scm_i_thread *scm_i_signal_delivery_thread = NULL; | |
96 | ||
97 | /* The mutex held when launching the signal delivery thread. */ | |
98 | static scm_i_pthread_mutex_t signal_delivery_thread_mutex = | |
99 | SCM_I_PTHREAD_MUTEX_INITIALIZER; | |
100 | ||
101 | ||
e1a191a8 GH |
102 | /* saves the original C handlers, when a new handler is installed. |
103 | set to SIG_ERR if the original handler is installed. */ | |
104 | #ifdef HAVE_SIGACTION | |
105 | static struct sigaction orig_handlers[NSIG]; | |
106 | #else | |
da6e81b6 | 107 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
108 | #endif |
109 | ||
9de87eea MV |
110 | static SCM |
111 | close_1 (SCM proc, SCM arg) | |
112 | { | |
113 | return scm_primitive_eval_x (scm_list_3 (scm_sym_lambda, SCM_EOL, | |
114 | scm_list_2 (proc, arg))); | |
115 | } | |
116 | ||
117 | #if SCM_USE_PTHREAD_THREADS | |
23d72566 KR |
118 | /* On mingw there's no notion of inter-process signals, only a raise() |
119 | within the process itself which apparently invokes the registered handler | |
120 | immediately. Not sure how well the following code will cope in this | |
121 | case. It builds but it may not offer quite the same scheme-level | |
122 | semantics as on a proper system. If you're relying on much in the way of | |
123 | signal handling on mingw you probably lose anyway. */ | |
9de87eea MV |
124 | |
125 | static int signal_pipe[2]; | |
dbbaa07c | 126 | |
e1a191a8 GH |
127 | static SIGRETTYPE |
128 | take_signal (int signum) | |
129 | { | |
9de87eea | 130 | char sigbyte = signum; |
634aa8de | 131 | full_write (signal_pipe[1], &sigbyte, 1); |
9de87eea | 132 | |
2fbc8609 MV |
133 | #ifndef HAVE_SIGACTION |
134 | signal (signum, take_signal); | |
135 | #endif | |
e1a191a8 | 136 | } |
0f2d19dd | 137 | |
af4081e9 AW |
138 | struct signal_pipe_data |
139 | { | |
140 | char sigbyte; | |
141 | ssize_t n; | |
142 | int err; | |
143 | }; | |
144 | ||
145 | static void* | |
146 | read_signal_pipe_data (void * data) | |
147 | { | |
148 | struct signal_pipe_data *sdata = data; | |
149 | ||
150 | sdata->n = read (signal_pipe[0], &sdata->sigbyte, 1); | |
151 | sdata->err = errno; | |
152 | ||
153 | return NULL; | |
154 | } | |
155 | ||
9de87eea MV |
156 | static SCM |
157 | signal_delivery_thread (void *data) | |
e1a191a8 | 158 | { |
af4081e9 | 159 | int sig; |
23d72566 KR |
160 | #if HAVE_PTHREAD_SIGMASK /* not on mingw, see notes above */ |
161 | sigset_t all_sigs; | |
9de87eea | 162 | sigfillset (&all_sigs); |
43adb591 AW |
163 | /* On libgc 7.1 and earlier, GC_do_blocking doesn't actually do |
164 | anything. So in that case, libgc will want to suspend the signal | |
165 | delivery thread, so we need to allow it to do so by unmasking the | |
166 | suspend signal. */ | |
167 | sigdelset (&all_sigs, GC_get_suspend_signal ()); | |
9de87eea | 168 | scm_i_pthread_sigmask (SIG_SETMASK, &all_sigs, NULL); |
23d72566 | 169 | #endif |
9de87eea MV |
170 | |
171 | while (1) | |
172 | { | |
af4081e9 AW |
173 | struct signal_pipe_data sigdata; |
174 | ||
175 | scm_without_guile (read_signal_pipe_data, &sigdata); | |
176 | ||
177 | sig = sigdata.sigbyte; | |
178 | if (sigdata.n == 1 && sig >= 0 && sig < NSIG) | |
9de87eea MV |
179 | { |
180 | SCM h, t; | |
181 | ||
182 | h = SCM_SIMPLE_VECTOR_REF (signal_handler_asyncs, sig); | |
183 | t = SCM_SIMPLE_VECTOR_REF (signal_handler_threads, sig); | |
184 | if (scm_is_true (h)) | |
185 | scm_system_async_mark_for_thread (h, t); | |
186 | } | |
af4081e9 | 187 | else if (sigdata.n == 0) |
2e77f720 | 188 | break; /* the signal pipe was closed. */ |
af4081e9 | 189 | else if (sigdata.n < 0 && sigdata.err != EINTR) |
9de87eea MV |
190 | perror ("error in signal delivery thread"); |
191 | } | |
229a0710 | 192 | |
2e77f720 | 193 | return SCM_UNSPECIFIED; /* not reached unless all other threads exited */ |
2fbc8609 | 194 | } |
e1a191a8 | 195 | |
9de87eea MV |
196 | static void |
197 | start_signal_delivery_thread (void) | |
2fbc8609 | 198 | { |
2e77f720 LC |
199 | SCM signal_thread; |
200 | ||
201 | scm_i_pthread_mutex_lock (&signal_delivery_thread_mutex); | |
202 | ||
32f94bf2 | 203 | if (pipe2 (signal_pipe, O_CLOEXEC) != 0) |
9de87eea | 204 | scm_syserror (NULL); |
2e77f720 LC |
205 | signal_thread = scm_spawn_thread (signal_delivery_thread, NULL, |
206 | scm_handle_by_message, | |
207 | "signal delivery thread"); | |
208 | scm_i_signal_delivery_thread = SCM_I_THREAD_DATA (signal_thread); | |
209 | ||
210 | scm_i_pthread_mutex_unlock (&signal_delivery_thread_mutex); | |
0f2d19dd JB |
211 | } |
212 | ||
2e77f720 LC |
213 | void |
214 | scm_i_ensure_signal_delivery_thread () | |
9de87eea MV |
215 | { |
216 | static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT; | |
217 | scm_i_pthread_once (&once, start_signal_delivery_thread); | |
218 | } | |
dbbaa07c | 219 | |
9de87eea | 220 | #else /* !SCM_USE_PTHREAD_THREADS */ |
dbbaa07c | 221 | |
9de87eea MV |
222 | static SIGRETTYPE |
223 | take_signal (int signum) | |
dbbaa07c | 224 | { |
9de87eea MV |
225 | SCM cell = SCM_SIMPLE_VECTOR_REF (signal_handler_asyncs, signum); |
226 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
227 | ||
228 | if (scm_is_false (SCM_CDR (cell))) | |
dbbaa07c | 229 | { |
9de87eea MV |
230 | SCM_SETCDR (cell, t->active_asyncs); |
231 | t->active_asyncs = cell; | |
232 | t->pending_asyncs = 1; | |
dbbaa07c | 233 | } |
9de87eea MV |
234 | |
235 | #ifndef HAVE_SIGACTION | |
236 | signal (signum, take_signal); | |
237 | #endif | |
dbbaa07c MV |
238 | } |
239 | ||
2e77f720 LC |
240 | void |
241 | scm_i_ensure_signal_delivery_thread () | |
dbbaa07c | 242 | { |
9de87eea MV |
243 | return; |
244 | } | |
dbbaa07c | 245 | |
9de87eea | 246 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
dbbaa07c | 247 | |
9de87eea MV |
248 | static void |
249 | install_handler (int signum, SCM thread, SCM handler) | |
250 | { | |
7888309b | 251 | if (scm_is_false (handler)) |
dbbaa07c | 252 | { |
4057a3e0 | 253 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, signum, SCM_BOOL_F); |
9de87eea | 254 | SCM_SIMPLE_VECTOR_SET (signal_handler_asyncs, signum, SCM_BOOL_F); |
dbbaa07c MV |
255 | } |
256 | else | |
257 | { | |
9de87eea MV |
258 | SCM async = close_1 (handler, scm_from_int (signum)); |
259 | #if !SCM_USE_PTHREAD_THREADS | |
260 | async = scm_cons (async, SCM_BOOL_F); | |
261 | #endif | |
4057a3e0 | 262 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, signum, handler); |
9de87eea | 263 | SCM_SIMPLE_VECTOR_SET (signal_handler_asyncs, signum, async); |
dbbaa07c MV |
264 | } |
265 | ||
9de87eea | 266 | SCM_SIMPLE_VECTOR_SET (signal_handler_threads, signum, thread); |
dbbaa07c MV |
267 | } |
268 | ||
9de87eea MV |
269 | SCM |
270 | scm_sigaction (SCM signum, SCM handler, SCM flags) | |
dbbaa07c | 271 | { |
9de87eea | 272 | return scm_sigaction_for_thread (signum, handler, flags, SCM_UNDEFINED); |
dbbaa07c MV |
273 | } |
274 | ||
e1a191a8 | 275 | /* user interface for installation of signal handlers. */ |
2fbc8609 MV |
276 | SCM_DEFINE (scm_sigaction_for_thread, "sigaction", 1, 3, 0, |
277 | (SCM signum, SCM handler, SCM flags, SCM thread), | |
0d172d3f | 278 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
279 | "@var{signum} is the signal number, which can be specified using the value\n" |
280 | "of variables such as @code{SIGINT}.\n\n" | |
2fbc8609 | 281 | "If @var{handler} is omitted, @code{sigaction} returns a pair: the\n" |
b380b885 MD |
282 | "CAR is the current\n" |
283 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
284 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
285 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
286 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
2fbc8609 MV |
287 | "If @var{handler} is provided, it is installed as the new handler for\n" |
288 | "@var{signum}. @var{handler} can be a Scheme procedure taking one\n" | |
b380b885 MD |
289 | "argument, or the value of @code{SIG_DFL} (default action) or\n" |
290 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
2fbc8609 MV |
291 | "was installed before @code{sigaction} was first used. When\n" |
292 | "a scheme procedure has been specified, that procedure will run\n" | |
293 | "in the given @var{thread}. When no thread has been given, the\n" | |
294 | "thread that made this call to @code{sigaction} is used.\n" | |
0ebbcf43 NJ |
295 | "Flags can optionally be specified for the new handler.\n" |
296 | "The return value is a pair with information about the\n" | |
b380b885 MD |
297 | "old handler as described above.\n\n" |
298 | "This interface does not provide access to the \"signal blocking\"\n" | |
299 | "facility. Maybe this is not needed, since the thread support may\n" | |
300 | "provide solutions to the problem of consistent access to data\n" | |
301 | "structures.") | |
2fbc8609 | 302 | #define FUNC_NAME s_scm_sigaction_for_thread |
e1a191a8 GH |
303 | { |
304 | int csig; | |
305 | #ifdef HAVE_SIGACTION | |
306 | struct sigaction action; | |
307 | struct sigaction old_action; | |
308 | #else | |
af68e5e5 | 309 | SIGRETTYPE (* chandler) (int) = SIG_DFL; |
e1a191a8 GH |
310 | SIGRETTYPE (* old_chandler) (int); |
311 | #endif | |
312 | int query_only = 0; | |
313 | int save_handler = 0; | |
34d19ef6 | 314 | |
e1a191a8 GH |
315 | SCM old_handler; |
316 | ||
a55c2b68 MV |
317 | csig = scm_to_signed_integer (signum, 0, NSIG-1); |
318 | ||
7ee92fce | 319 | #if defined(HAVE_SIGACTION) |
e1a191a8 | 320 | action.sa_flags = 0; |
e1a191a8 | 321 | if (!SCM_UNBNDP (flags)) |
a55c2b68 | 322 | action.sa_flags |= scm_to_int (flags); |
e1a191a8 | 323 | sigemptyset (&action.sa_mask); |
4feac0b9 MV |
324 | #endif |
325 | ||
2fbc8609 MV |
326 | if (SCM_UNBNDP (thread)) |
327 | thread = scm_current_thread (); | |
328 | else | |
dbbaa07c MV |
329 | { |
330 | SCM_VALIDATE_THREAD (4, thread); | |
331 | if (scm_c_thread_exited_p (thread)) | |
332 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
333 | } | |
4feac0b9 | 334 | |
2e77f720 | 335 | scm_i_ensure_signal_delivery_thread (); |
9de87eea MV |
336 | |
337 | SCM_CRITICAL_SECTION_START; | |
4057a3e0 | 338 | old_handler = SCM_SIMPLE_VECTOR_REF (*signal_handlers, csig); |
e1a191a8 GH |
339 | if (SCM_UNBNDP (handler)) |
340 | query_only = 1; | |
e11e83f3 | 341 | else if (scm_is_integer (handler)) |
e1a191a8 | 342 | { |
9de87eea MV |
343 | long handler_int = scm_to_long (handler); |
344 | ||
345 | if (handler_int == (long) SIG_DFL || handler_int == (long) SIG_IGN) | |
e1a191a8 GH |
346 | { |
347 | #ifdef HAVE_SIGACTION | |
9de87eea | 348 | action.sa_handler = (SIGRETTYPE (*) (int)) handler_int; |
e1a191a8 | 349 | #else |
9de87eea | 350 | chandler = (SIGRETTYPE (*) (int)) handler_int; |
e1a191a8 | 351 | #endif |
dbbaa07c | 352 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
353 | } |
354 | else | |
09d978f3 NJ |
355 | { |
356 | SCM_CRITICAL_SECTION_END; | |
357 | SCM_OUT_OF_RANGE (2, handler); | |
358 | } | |
e1a191a8 | 359 | } |
7888309b | 360 | else if (scm_is_false (handler)) |
e1a191a8 GH |
361 | { |
362 | /* restore the default handler. */ | |
363 | #ifdef HAVE_SIGACTION | |
364 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
365 | query_only = 1; | |
366 | else | |
367 | { | |
368 | action = orig_handlers[csig]; | |
369 | orig_handlers[csig].sa_handler = SIG_ERR; | |
dbbaa07c | 370 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
371 | } |
372 | #else | |
373 | if (orig_handlers[csig] == SIG_ERR) | |
374 | query_only = 1; | |
375 | else | |
376 | { | |
377 | chandler = orig_handlers[csig]; | |
378 | orig_handlers[csig] = SIG_ERR; | |
dbbaa07c | 379 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
380 | } |
381 | #endif | |
adb2c53b | 382 | } |
e1a191a8 GH |
383 | else |
384 | { | |
43067cec | 385 | SCM_VALIDATE_PROC (2, handler); |
e1a191a8 GH |
386 | #ifdef HAVE_SIGACTION |
387 | action.sa_handler = take_signal; | |
388 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
389 | save_handler = 1; | |
390 | #else | |
391 | chandler = take_signal; | |
392 | if (orig_handlers[csig] == SIG_ERR) | |
393 | save_handler = 1; | |
394 | #endif | |
dbbaa07c | 395 | install_handler (csig, thread, handler); |
e1a191a8 | 396 | } |
adb2c53b | 397 | |
0d172d3f MV |
398 | /* XXX - Silently ignore setting handlers for `program error signals' |
399 | because they can't currently be handled by Scheme code. | |
400 | */ | |
401 | ||
402 | switch (csig) | |
403 | { | |
404 | /* This list of program error signals is from the GNU Libc | |
405 | Reference Manual */ | |
406 | case SIGFPE: | |
407 | case SIGILL: | |
408 | case SIGSEGV: | |
82893676 | 409 | #ifdef SIGBUS |
0d172d3f | 410 | case SIGBUS: |
82893676 | 411 | #endif |
0d172d3f | 412 | case SIGABRT: |
6732de1b | 413 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
414 | case SIGIOT: |
415 | #endif | |
82893676 | 416 | #ifdef SIGTRAP |
0d172d3f | 417 | case SIGTRAP: |
82893676 | 418 | #endif |
0d172d3f MV |
419 | #ifdef SIGEMT |
420 | case SIGEMT: | |
421 | #endif | |
adb2c53b | 422 | #ifdef SIGSYS |
0d172d3f | 423 | case SIGSYS: |
adb2c53b | 424 | #endif |
0d172d3f MV |
425 | query_only = 1; |
426 | } | |
427 | ||
e1a191a8 GH |
428 | #ifdef HAVE_SIGACTION |
429 | if (query_only) | |
430 | { | |
431 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 432 | SCM_SYSERROR; |
e1a191a8 GH |
433 | } |
434 | else | |
435 | { | |
436 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 437 | SCM_SYSERROR; |
e1a191a8 GH |
438 | if (save_handler) |
439 | orig_handlers[csig] = old_action; | |
440 | } | |
441 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
b9bd8526 | 442 | old_handler = scm_from_long ((long) old_action.sa_handler); |
9de87eea | 443 | SCM_CRITICAL_SECTION_END; |
e11e83f3 | 444 | return scm_cons (old_handler, scm_from_int (old_action.sa_flags)); |
e1a191a8 GH |
445 | #else |
446 | if (query_only) | |
447 | { | |
448 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 449 | SCM_SYSERROR; |
e1a191a8 | 450 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 451 | SCM_SYSERROR; |
e1a191a8 GH |
452 | } |
453 | else | |
454 | { | |
455 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 456 | SCM_SYSERROR; |
e1a191a8 GH |
457 | if (save_handler) |
458 | orig_handlers[csig] = old_chandler; | |
459 | } | |
460 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
b9bd8526 | 461 | old_handler = scm_from_long ((long) old_chandler); |
9de87eea | 462 | SCM_CRITICAL_SECTION_END; |
e11e83f3 | 463 | return scm_cons (old_handler, scm_from_int (0)); |
0f2d19dd | 464 | #endif |
e1a191a8 | 465 | } |
1bbd0b84 | 466 | #undef FUNC_NAME |
e1a191a8 | 467 | |
adb2c53b | 468 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 469 | (void), |
b380b885 MD |
470 | "Return all signal handlers to the values they had before any call to\n" |
471 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 472 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
473 | { |
474 | int i; | |
e1a191a8 GH |
475 | for (i = 0; i < NSIG; i++) |
476 | { | |
477 | #ifdef HAVE_SIGACTION | |
478 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
479 | { | |
480 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 481 | SCM_SYSERROR; |
e1a191a8 | 482 | orig_handlers[i].sa_handler = SIG_ERR; |
4057a3e0 | 483 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
484 | } |
485 | #else | |
486 | if (orig_handlers[i] != SIG_ERR) | |
487 | { | |
488 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 489 | SCM_SYSERROR; |
e1a191a8 | 490 | orig_handlers[i] = SIG_ERR; |
4057a3e0 | 491 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
492 | } |
493 | #endif | |
494 | } | |
495 | return SCM_UNSPECIFIED; | |
496 | } | |
1bbd0b84 | 497 | #undef FUNC_NAME |
0f2d19dd | 498 | |
c8e839cf | 499 | #if HAVE_DECL_ALARM |
adb2c53b | 500 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 501 | (SCM i), |
b380b885 MD |
502 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
503 | "number of seconds (an integer). It's advisable to install a signal\n" | |
504 | "handler for\n" | |
505 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
506 | "the process.\n\n" | |
507 | "The return value indicates the time remaining for the previous alarm,\n" | |
508 | "if any. The new value replaces the previous alarm. If there was\n" | |
509 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 510 | #define FUNC_NAME s_scm_alarm |
0f2d19dd | 511 | { |
a55c2b68 | 512 | return scm_from_uint (alarm (scm_to_uint (i))); |
0f2d19dd | 513 | } |
1bbd0b84 | 514 | #undef FUNC_NAME |
cdd125e8 | 515 | #endif /* HAVE_ALARM */ |
0f2d19dd | 516 | |
53f8a0d2 RB |
517 | #ifdef HAVE_SETITIMER |
518 | SCM_DEFINE (scm_setitimer, "setitimer", 5, 0, 0, | |
519 | (SCM which_timer, | |
520 | SCM interval_seconds, SCM interval_microseconds, | |
521 | SCM value_seconds, SCM value_microseconds), | |
522 | "Set the timer specified by @var{which_timer} according to the given\n" | |
523 | "@var{interval_seconds}, @var{interval_microseconds},\n" | |
524 | "@var{value_seconds}, and @var{value_microseconds} values.\n" | |
525 | "\n" | |
526 | "Return information about the timer's previous setting." | |
527 | "\n" | |
528 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
529 | "Interface Conventions''.\n" | |
530 | "\n" | |
9401323e | 531 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
532 | "and @code{ITIMER_PROF}.\n" |
533 | "\n" | |
534 | "The return value will be a list of two cons pairs representing the\n" | |
535 | "current state of the given timer. The first pair is the seconds and\n" | |
536 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 537 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
538 | #define FUNC_NAME s_scm_setitimer |
539 | { | |
540 | int rv; | |
541 | int c_which_timer; | |
542 | struct itimerval new_timer; | |
543 | struct itimerval old_timer; | |
544 | ||
545 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
546 | new_timer.it_interval.tv_sec = SCM_NUM2LONG(2, interval_seconds); | |
547 | new_timer.it_interval.tv_usec = SCM_NUM2LONG(3, interval_microseconds); | |
548 | new_timer.it_value.tv_sec = SCM_NUM2LONG(4, value_seconds); | |
549 | new_timer.it_value.tv_usec = SCM_NUM2LONG(5, value_microseconds); | |
550 | ||
551 | SCM_SYSCALL(rv = setitimer(c_which_timer, &new_timer, &old_timer)); | |
552 | ||
553 | if(rv != 0) | |
554 | SCM_SYSERROR; | |
555 | ||
b9bd8526 MV |
556 | return scm_list_2 (scm_cons (scm_from_long (old_timer.it_interval.tv_sec), |
557 | scm_from_long (old_timer.it_interval.tv_usec)), | |
558 | scm_cons (scm_from_long (old_timer.it_value.tv_sec), | |
559 | scm_from_long (old_timer.it_value.tv_usec))); | |
53f8a0d2 RB |
560 | } |
561 | #undef FUNC_NAME | |
562 | #endif /* HAVE_SETITIMER */ | |
563 | ||
564 | #ifdef HAVE_GETITIMER | |
565 | SCM_DEFINE (scm_getitimer, "getitimer", 1, 0, 0, | |
566 | (SCM which_timer), | |
567 | "Return information about the timer specified by @var{which_timer}" | |
568 | "\n" | |
569 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
570 | "Interface Conventions''.\n" | |
571 | "\n" | |
9401323e | 572 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
573 | "and @code{ITIMER_PROF}.\n" |
574 | "\n" | |
575 | "The return value will be a list of two cons pairs representing the\n" | |
576 | "current state of the given timer. The first pair is the seconds and\n" | |
577 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 578 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
579 | #define FUNC_NAME s_scm_getitimer |
580 | { | |
581 | int rv; | |
582 | int c_which_timer; | |
583 | struct itimerval old_timer; | |
584 | ||
585 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
586 | ||
587 | SCM_SYSCALL(rv = getitimer(c_which_timer, &old_timer)); | |
588 | ||
589 | if(rv != 0) | |
590 | SCM_SYSERROR; | |
591 | ||
b9bd8526 MV |
592 | return scm_list_2 (scm_cons (scm_from_long (old_timer.it_interval.tv_sec), |
593 | scm_from_long (old_timer.it_interval.tv_usec)), | |
594 | scm_cons (scm_from_long (old_timer.it_value.tv_sec), | |
595 | scm_from_long (old_timer.it_value.tv_usec))); | |
53f8a0d2 RB |
596 | } |
597 | #undef FUNC_NAME | |
598 | #endif /* HAVE_GETITIMER */ | |
599 | ||
0e958795 | 600 | #ifdef HAVE_PAUSE |
adb2c53b | 601 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 602 | (), |
b380b885 MD |
603 | "Pause the current process (thread?) until a signal arrives whose\n" |
604 | "action is to either terminate the current process or invoke a\n" | |
605 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 606 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
607 | { |
608 | pause (); | |
609 | return SCM_UNSPECIFIED; | |
610 | } | |
1bbd0b84 | 611 | #undef FUNC_NAME |
0e958795 | 612 | #endif |
0f2d19dd | 613 | |
adb2c53b | 614 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 615 | (SCM i), |
b380b885 MD |
616 | "Wait for the given number of seconds (an integer) or until a signal\n" |
617 | "arrives. The return value is zero if the time elapses or the number\n" | |
651f2cd2 KR |
618 | "of seconds remaining otherwise.\n" |
619 | "\n" | |
620 | "See also @code{usleep}.") | |
1bbd0b84 | 621 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 622 | { |
9de87eea | 623 | return scm_from_uint (scm_std_sleep (scm_to_uint (i))); |
0f2d19dd | 624 | } |
1bbd0b84 | 625 | #undef FUNC_NAME |
0f2d19dd | 626 | |
adb2c53b | 627 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 628 | (SCM i), |
651f2cd2 KR |
629 | "Wait the given period @var{usecs} microseconds (an integer).\n" |
630 | "If a signal arrives the wait stops and the return value is the\n" | |
631 | "time remaining, in microseconds. If the period elapses with no\n" | |
632 | "signal the return is zero.\n" | |
633 | "\n" | |
634 | "On most systems the process scheduler is not microsecond accurate and\n" | |
635 | "the actual period slept by @code{usleep} may be rounded to a system\n" | |
636 | "clock tick boundary. Traditionally such ticks were 10 milliseconds\n" | |
637 | "apart, and that interval is often still used.\n" | |
638 | "\n" | |
639 | "See also @code{sleep}.") | |
1bbd0b84 | 640 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 641 | { |
9de87eea | 642 | return scm_from_ulong (scm_std_usleep (scm_to_ulong (i))); |
b74f4728 | 643 | } |
1bbd0b84 | 644 | #undef FUNC_NAME |
ce874f2d | 645 | |
adb2c53b | 646 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 647 | (SCM sig), |
b380b885 MD |
648 | "Sends a specified signal @var{sig} to the current process, where\n" |
649 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 650 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 651 | { |
23d72566 | 652 | if (raise (scm_to_int (sig)) != 0) |
1bbd0b84 | 653 | SCM_SYSERROR; |
e1a191a8 | 654 | return SCM_UNSPECIFIED; |
0f2d19dd | 655 | } |
1bbd0b84 | 656 | #undef FUNC_NAME |
0f2d19dd JB |
657 | |
658 | \f | |
0f2d19dd | 659 | |
2e77f720 LC |
660 | void |
661 | scm_i_close_signal_pipe() | |
662 | { | |
663 | /* SIGNAL_DELIVERY_THREAD_MUTEX is only locked while the signal delivery | |
664 | thread is being launched. The thread that calls this function is | |
665 | already holding the thread admin mutex, so if the delivery thread hasn't | |
666 | been launched at this point, it never will be before shutdown. */ | |
667 | scm_i_pthread_mutex_lock (&signal_delivery_thread_mutex); | |
668 | ||
70eca635 | 669 | #if SCM_USE_PTHREAD_THREADS |
2e77f720 LC |
670 | if (scm_i_signal_delivery_thread != NULL) |
671 | close (signal_pipe[1]); | |
70eca635 | 672 | #endif |
2e77f720 LC |
673 | |
674 | scm_i_pthread_mutex_unlock (&signal_delivery_thread_mutex); | |
675 | } | |
676 | ||
e1a191a8 GH |
677 | void |
678 | scm_init_scmsigs () | |
0f2d19dd | 679 | { |
e1a191a8 GH |
680 | int i; |
681 | ||
682 | signal_handlers = | |
86d31dfe MV |
683 | SCM_VARIABLE_LOC (scm_c_define ("signal-handlers", |
684 | scm_c_make_vector (NSIG, SCM_BOOL_F))); | |
f39448c5 AW |
685 | signal_handler_asyncs = scm_c_make_vector (NSIG, SCM_BOOL_F); |
686 | signal_handler_threads = scm_c_make_vector (NSIG, SCM_BOOL_F); | |
e1a191a8 GH |
687 | |
688 | for (i = 0; i < NSIG; i++) | |
689 | { | |
e1a191a8 GH |
690 | #ifdef HAVE_SIGACTION |
691 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 692 | |
e1a191a8 GH |
693 | #else |
694 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 695 | #endif |
e1a191a8 | 696 | } |
1cc91f1b | 697 | |
b9bd8526 MV |
698 | scm_c_define ("NSIG", scm_from_long (NSIG)); |
699 | scm_c_define ("SIG_IGN", scm_from_long ((long) SIG_IGN)); | |
700 | scm_c_define ("SIG_DFL", scm_from_long ((long) SIG_DFL)); | |
e1a191a8 | 701 | #ifdef SA_NOCLDSTOP |
b9bd8526 | 702 | scm_c_define ("SA_NOCLDSTOP", scm_from_long (SA_NOCLDSTOP)); |
0f2d19dd | 703 | #endif |
e1a191a8 | 704 | #ifdef SA_RESTART |
b9bd8526 | 705 | scm_c_define ("SA_RESTART", scm_from_long (SA_RESTART)); |
0f2d19dd | 706 | #endif |
1cc91f1b | 707 | |
53f8a0d2 RB |
708 | #if defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) |
709 | /* Stuff needed by setitimer and getitimer. */ | |
e11e83f3 MV |
710 | scm_c_define ("ITIMER_REAL", scm_from_int (ITIMER_REAL)); |
711 | scm_c_define ("ITIMER_VIRTUAL", scm_from_int (ITIMER_VIRTUAL)); | |
712 | scm_c_define ("ITIMER_PROF", scm_from_int (ITIMER_PROF)); | |
53f8a0d2 RB |
713 | #endif /* defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) */ |
714 | ||
a0599745 | 715 | #include "libguile/scmsigs.x" |
0f2d19dd JB |
716 | } |
717 | ||
89e00824 ML |
718 | |
719 | /* | |
720 | Local Variables: | |
721 | c-file-style: "gnu" | |
722 | End: | |
723 | */ |