Commit | Line | Data |
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bc8e6d7d MW |
1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2004, 2006, |
2 | * 2007, 2008, 2009, 2011, 2013, 2014 Free Software Foundation, Inc. | |
adb2c53b | 3 | * |
73be1d9e | 4 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
5 | * modify it under the terms of the GNU Lesser General Public License |
6 | * as published by the Free Software Foundation; either version 3 of | |
7 | * the License, or (at your option) any later version. | |
adb2c53b | 8 | * |
53befeb7 NJ |
9 | * This library is distributed in the hope that it will be useful, but |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. | |
adb2c53b | 13 | * |
73be1d9e MV |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
17 | * 02110-1301 USA | |
73be1d9e | 18 | */ |
1bbd0b84 | 19 | |
1bbd0b84 | 20 | |
0f2d19dd JB |
21 | \f |
22 | ||
dbb605f5 | 23 | #ifdef HAVE_CONFIG_H |
29d36c2d RB |
24 | # include <config.h> |
25 | #endif | |
26 | ||
23d72566 | 27 | #include <fcntl.h> /* for mingw */ |
0f2d19dd | 28 | #include <signal.h> |
9de87eea | 29 | #include <stdio.h> |
e6e2e95a MD |
30 | #include <errno.h> |
31 | ||
23d72566 KR |
32 | #ifdef HAVE_PROCESS_H |
33 | #include <process.h> /* for mingw */ | |
34 | #endif | |
35 | ||
0f2d19dd | 36 | #include <unistd.h> |
0f2d19dd | 37 | |
1bed8c28 GH |
38 | #ifdef HAVE_SYS_TIME_H |
39 | #include <sys/time.h> | |
40 | #endif | |
41 | ||
634aa8de LC |
42 | #include <full-write.h> |
43 | ||
cdd125e8 AW |
44 | #include "libguile/_scm.h" |
45 | ||
46 | #include "libguile/async.h" | |
47 | #include "libguile/eval.h" | |
48 | #include "libguile/root.h" | |
49 | #include "libguile/vectors.h" | |
50 | #include "libguile/threads.h" | |
51 | ||
52 | #include "libguile/validate.h" | |
53 | #include "libguile/scmsigs.h" | |
54 | ||
634aa8de | 55 | |
0f2d19dd JB |
56 | \f |
57 | ||
e1a191a8 | 58 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
59 | |
60 | #ifdef RETSIGTYPE | |
e1a191a8 | 61 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 62 | #else |
e1a191a8 GH |
63 | # ifdef STDC_HEADERS |
64 | # define SIGRETTYPE void | |
65 | # else | |
66 | # define SIGRETTYPE int | |
67 | # endif | |
0f2d19dd JB |
68 | #endif |
69 | ||
70 | \f | |
71 | ||
e1a191a8 | 72 | /* take_signal is installed as the C signal handler whenever a Scheme |
9de87eea MV |
73 | handler is set. When a signal arrives, take_signal will write a |
74 | byte into the 'signal pipe'. The 'signal delivery thread' will | |
75 | read this pipe and queue the appropriate asyncs. | |
76 | ||
77 | When Guile is built without threads, the signal handler will | |
78 | install the async directly. | |
79 | */ | |
0f2d19dd | 80 | |
0f2d19dd | 81 | |
2fbc8609 | 82 | /* Scheme vectors with information about a signal. signal_handlers |
9de87eea MV |
83 | contains the handler procedure or #f, signal_handler_asyncs |
84 | contains the thunk to be marked as an async when the signal arrives | |
85 | (or the cell with the thunk in a singlethreaded Guile), and | |
dbbaa07c MV |
86 | signal_handler_threads points to the thread that a signal should be |
87 | delivered to. | |
2fbc8609 | 88 | */ |
e1a191a8 | 89 | static SCM *signal_handlers; |
9de87eea | 90 | static SCM signal_handler_asyncs; |
2fbc8609 | 91 | static SCM signal_handler_threads; |
0f2d19dd | 92 | |
2e77f720 LC |
93 | /* The signal delivery thread. */ |
94 | scm_i_thread *scm_i_signal_delivery_thread = NULL; | |
95 | ||
96 | /* The mutex held when launching the signal delivery thread. */ | |
97 | static scm_i_pthread_mutex_t signal_delivery_thread_mutex = | |
98 | SCM_I_PTHREAD_MUTEX_INITIALIZER; | |
99 | ||
100 | ||
e1a191a8 GH |
101 | /* saves the original C handlers, when a new handler is installed. |
102 | set to SIG_ERR if the original handler is installed. */ | |
103 | #ifdef HAVE_SIGACTION | |
104 | static struct sigaction orig_handlers[NSIG]; | |
105 | #else | |
da6e81b6 | 106 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
107 | #endif |
108 | ||
9de87eea MV |
109 | static SCM |
110 | close_1 (SCM proc, SCM arg) | |
111 | { | |
112 | return scm_primitive_eval_x (scm_list_3 (scm_sym_lambda, SCM_EOL, | |
113 | scm_list_2 (proc, arg))); | |
114 | } | |
115 | ||
116 | #if SCM_USE_PTHREAD_THREADS | |
23d72566 KR |
117 | /* On mingw there's no notion of inter-process signals, only a raise() |
118 | within the process itself which apparently invokes the registered handler | |
119 | immediately. Not sure how well the following code will cope in this | |
120 | case. It builds but it may not offer quite the same scheme-level | |
121 | semantics as on a proper system. If you're relying on much in the way of | |
122 | signal handling on mingw you probably lose anyway. */ | |
9de87eea MV |
123 | |
124 | static int signal_pipe[2]; | |
dbbaa07c | 125 | |
e1a191a8 GH |
126 | static SIGRETTYPE |
127 | take_signal (int signum) | |
128 | { | |
9de87eea | 129 | char sigbyte = signum; |
634aa8de | 130 | full_write (signal_pipe[1], &sigbyte, 1); |
9de87eea | 131 | |
2fbc8609 MV |
132 | #ifndef HAVE_SIGACTION |
133 | signal (signum, take_signal); | |
134 | #endif | |
e1a191a8 | 135 | } |
0f2d19dd | 136 | |
af4081e9 AW |
137 | struct signal_pipe_data |
138 | { | |
139 | char sigbyte; | |
140 | ssize_t n; | |
141 | int err; | |
142 | }; | |
143 | ||
144 | static void* | |
145 | read_signal_pipe_data (void * data) | |
146 | { | |
147 | struct signal_pipe_data *sdata = data; | |
148 | ||
149 | sdata->n = read (signal_pipe[0], &sdata->sigbyte, 1); | |
150 | sdata->err = errno; | |
151 | ||
152 | return NULL; | |
153 | } | |
154 | ||
9de87eea MV |
155 | static SCM |
156 | signal_delivery_thread (void *data) | |
e1a191a8 | 157 | { |
af4081e9 | 158 | int sig; |
23d72566 KR |
159 | #if HAVE_PTHREAD_SIGMASK /* not on mingw, see notes above */ |
160 | sigset_t all_sigs; | |
9de87eea MV |
161 | sigfillset (&all_sigs); |
162 | scm_i_pthread_sigmask (SIG_SETMASK, &all_sigs, NULL); | |
23d72566 | 163 | #endif |
9de87eea MV |
164 | |
165 | while (1) | |
166 | { | |
af4081e9 AW |
167 | struct signal_pipe_data sigdata; |
168 | ||
169 | scm_without_guile (read_signal_pipe_data, &sigdata); | |
170 | ||
171 | sig = sigdata.sigbyte; | |
172 | if (sigdata.n == 1 && sig >= 0 && sig < NSIG) | |
9de87eea MV |
173 | { |
174 | SCM h, t; | |
175 | ||
176 | h = SCM_SIMPLE_VECTOR_REF (signal_handler_asyncs, sig); | |
177 | t = SCM_SIMPLE_VECTOR_REF (signal_handler_threads, sig); | |
178 | if (scm_is_true (h)) | |
179 | scm_system_async_mark_for_thread (h, t); | |
180 | } | |
af4081e9 | 181 | else if (sigdata.n == 0) |
2e77f720 | 182 | break; /* the signal pipe was closed. */ |
af4081e9 | 183 | else if (sigdata.n < 0 && sigdata.err != EINTR) |
9de87eea MV |
184 | perror ("error in signal delivery thread"); |
185 | } | |
229a0710 | 186 | |
2e77f720 | 187 | return SCM_UNSPECIFIED; /* not reached unless all other threads exited */ |
2fbc8609 | 188 | } |
e1a191a8 | 189 | |
9de87eea MV |
190 | static void |
191 | start_signal_delivery_thread (void) | |
2fbc8609 | 192 | { |
2e77f720 LC |
193 | SCM signal_thread; |
194 | ||
195 | scm_i_pthread_mutex_lock (&signal_delivery_thread_mutex); | |
196 | ||
32f94bf2 | 197 | if (pipe2 (signal_pipe, O_CLOEXEC) != 0) |
9de87eea | 198 | scm_syserror (NULL); |
2e77f720 LC |
199 | signal_thread = scm_spawn_thread (signal_delivery_thread, NULL, |
200 | scm_handle_by_message, | |
201 | "signal delivery thread"); | |
202 | scm_i_signal_delivery_thread = SCM_I_THREAD_DATA (signal_thread); | |
203 | ||
204 | scm_i_pthread_mutex_unlock (&signal_delivery_thread_mutex); | |
0f2d19dd JB |
205 | } |
206 | ||
2e77f720 LC |
207 | void |
208 | scm_i_ensure_signal_delivery_thread () | |
9de87eea MV |
209 | { |
210 | static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT; | |
211 | scm_i_pthread_once (&once, start_signal_delivery_thread); | |
212 | } | |
dbbaa07c | 213 | |
9de87eea | 214 | #else /* !SCM_USE_PTHREAD_THREADS */ |
dbbaa07c | 215 | |
9de87eea MV |
216 | static SIGRETTYPE |
217 | take_signal (int signum) | |
dbbaa07c | 218 | { |
9de87eea MV |
219 | SCM cell = SCM_SIMPLE_VECTOR_REF (signal_handler_asyncs, signum); |
220 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
221 | ||
222 | if (scm_is_false (SCM_CDR (cell))) | |
dbbaa07c | 223 | { |
9de87eea MV |
224 | SCM_SETCDR (cell, t->active_asyncs); |
225 | t->active_asyncs = cell; | |
226 | t->pending_asyncs = 1; | |
dbbaa07c | 227 | } |
9de87eea MV |
228 | |
229 | #ifndef HAVE_SIGACTION | |
230 | signal (signum, take_signal); | |
231 | #endif | |
dbbaa07c MV |
232 | } |
233 | ||
2e77f720 LC |
234 | void |
235 | scm_i_ensure_signal_delivery_thread () | |
dbbaa07c | 236 | { |
9de87eea MV |
237 | return; |
238 | } | |
dbbaa07c | 239 | |
9de87eea | 240 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
dbbaa07c | 241 | |
9de87eea MV |
242 | static void |
243 | install_handler (int signum, SCM thread, SCM handler) | |
244 | { | |
7888309b | 245 | if (scm_is_false (handler)) |
dbbaa07c | 246 | { |
4057a3e0 | 247 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, signum, SCM_BOOL_F); |
9de87eea | 248 | SCM_SIMPLE_VECTOR_SET (signal_handler_asyncs, signum, SCM_BOOL_F); |
dbbaa07c MV |
249 | } |
250 | else | |
251 | { | |
9de87eea MV |
252 | SCM async = close_1 (handler, scm_from_int (signum)); |
253 | #if !SCM_USE_PTHREAD_THREADS | |
254 | async = scm_cons (async, SCM_BOOL_F); | |
255 | #endif | |
4057a3e0 | 256 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, signum, handler); |
9de87eea | 257 | SCM_SIMPLE_VECTOR_SET (signal_handler_asyncs, signum, async); |
dbbaa07c MV |
258 | } |
259 | ||
9de87eea | 260 | SCM_SIMPLE_VECTOR_SET (signal_handler_threads, signum, thread); |
dbbaa07c MV |
261 | } |
262 | ||
9de87eea MV |
263 | SCM |
264 | scm_sigaction (SCM signum, SCM handler, SCM flags) | |
dbbaa07c | 265 | { |
9de87eea | 266 | return scm_sigaction_for_thread (signum, handler, flags, SCM_UNDEFINED); |
dbbaa07c MV |
267 | } |
268 | ||
e1a191a8 | 269 | /* user interface for installation of signal handlers. */ |
2fbc8609 MV |
270 | SCM_DEFINE (scm_sigaction_for_thread, "sigaction", 1, 3, 0, |
271 | (SCM signum, SCM handler, SCM flags, SCM thread), | |
0d172d3f | 272 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
273 | "@var{signum} is the signal number, which can be specified using the value\n" |
274 | "of variables such as @code{SIGINT}.\n\n" | |
2fbc8609 | 275 | "If @var{handler} is omitted, @code{sigaction} returns a pair: the\n" |
b380b885 MD |
276 | "CAR is the current\n" |
277 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
278 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
279 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
280 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
2fbc8609 MV |
281 | "If @var{handler} is provided, it is installed as the new handler for\n" |
282 | "@var{signum}. @var{handler} can be a Scheme procedure taking one\n" | |
b380b885 MD |
283 | "argument, or the value of @code{SIG_DFL} (default action) or\n" |
284 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
2fbc8609 MV |
285 | "was installed before @code{sigaction} was first used. When\n" |
286 | "a scheme procedure has been specified, that procedure will run\n" | |
287 | "in the given @var{thread}. When no thread has been given, the\n" | |
288 | "thread that made this call to @code{sigaction} is used.\n" | |
0ebbcf43 NJ |
289 | "Flags can optionally be specified for the new handler.\n" |
290 | "The return value is a pair with information about the\n" | |
b380b885 MD |
291 | "old handler as described above.\n\n" |
292 | "This interface does not provide access to the \"signal blocking\"\n" | |
293 | "facility. Maybe this is not needed, since the thread support may\n" | |
294 | "provide solutions to the problem of consistent access to data\n" | |
295 | "structures.") | |
2fbc8609 | 296 | #define FUNC_NAME s_scm_sigaction_for_thread |
e1a191a8 GH |
297 | { |
298 | int csig; | |
299 | #ifdef HAVE_SIGACTION | |
300 | struct sigaction action; | |
301 | struct sigaction old_action; | |
302 | #else | |
af68e5e5 | 303 | SIGRETTYPE (* chandler) (int) = SIG_DFL; |
e1a191a8 GH |
304 | SIGRETTYPE (* old_chandler) (int); |
305 | #endif | |
306 | int query_only = 0; | |
307 | int save_handler = 0; | |
34d19ef6 | 308 | |
e1a191a8 GH |
309 | SCM old_handler; |
310 | ||
a55c2b68 MV |
311 | csig = scm_to_signed_integer (signum, 0, NSIG-1); |
312 | ||
7ee92fce | 313 | #if defined(HAVE_SIGACTION) |
e1a191a8 | 314 | action.sa_flags = 0; |
e1a191a8 | 315 | if (!SCM_UNBNDP (flags)) |
a55c2b68 | 316 | action.sa_flags |= scm_to_int (flags); |
e1a191a8 | 317 | sigemptyset (&action.sa_mask); |
4feac0b9 MV |
318 | #endif |
319 | ||
2fbc8609 MV |
320 | if (SCM_UNBNDP (thread)) |
321 | thread = scm_current_thread (); | |
322 | else | |
dbbaa07c MV |
323 | { |
324 | SCM_VALIDATE_THREAD (4, thread); | |
325 | if (scm_c_thread_exited_p (thread)) | |
326 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
327 | } | |
4feac0b9 | 328 | |
2e77f720 | 329 | scm_i_ensure_signal_delivery_thread (); |
9de87eea MV |
330 | |
331 | SCM_CRITICAL_SECTION_START; | |
4057a3e0 | 332 | old_handler = SCM_SIMPLE_VECTOR_REF (*signal_handlers, csig); |
e1a191a8 GH |
333 | if (SCM_UNBNDP (handler)) |
334 | query_only = 1; | |
e11e83f3 | 335 | else if (scm_is_integer (handler)) |
e1a191a8 | 336 | { |
9de87eea MV |
337 | long handler_int = scm_to_long (handler); |
338 | ||
339 | if (handler_int == (long) SIG_DFL || handler_int == (long) SIG_IGN) | |
e1a191a8 GH |
340 | { |
341 | #ifdef HAVE_SIGACTION | |
9de87eea | 342 | action.sa_handler = (SIGRETTYPE (*) (int)) handler_int; |
e1a191a8 | 343 | #else |
9de87eea | 344 | chandler = (SIGRETTYPE (*) (int)) handler_int; |
e1a191a8 | 345 | #endif |
dbbaa07c | 346 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
347 | } |
348 | else | |
09d978f3 NJ |
349 | { |
350 | SCM_CRITICAL_SECTION_END; | |
351 | SCM_OUT_OF_RANGE (2, handler); | |
352 | } | |
e1a191a8 | 353 | } |
7888309b | 354 | else if (scm_is_false (handler)) |
e1a191a8 GH |
355 | { |
356 | /* restore the default handler. */ | |
357 | #ifdef HAVE_SIGACTION | |
358 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
359 | query_only = 1; | |
360 | else | |
361 | { | |
362 | action = orig_handlers[csig]; | |
363 | orig_handlers[csig].sa_handler = SIG_ERR; | |
dbbaa07c | 364 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
365 | } |
366 | #else | |
367 | if (orig_handlers[csig] == SIG_ERR) | |
368 | query_only = 1; | |
369 | else | |
370 | { | |
371 | chandler = orig_handlers[csig]; | |
372 | orig_handlers[csig] = SIG_ERR; | |
dbbaa07c | 373 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
374 | } |
375 | #endif | |
adb2c53b | 376 | } |
e1a191a8 GH |
377 | else |
378 | { | |
43067cec | 379 | SCM_VALIDATE_PROC (2, handler); |
e1a191a8 GH |
380 | #ifdef HAVE_SIGACTION |
381 | action.sa_handler = take_signal; | |
382 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
383 | save_handler = 1; | |
384 | #else | |
385 | chandler = take_signal; | |
386 | if (orig_handlers[csig] == SIG_ERR) | |
387 | save_handler = 1; | |
388 | #endif | |
dbbaa07c | 389 | install_handler (csig, thread, handler); |
e1a191a8 | 390 | } |
adb2c53b | 391 | |
0d172d3f MV |
392 | /* XXX - Silently ignore setting handlers for `program error signals' |
393 | because they can't currently be handled by Scheme code. | |
394 | */ | |
395 | ||
396 | switch (csig) | |
397 | { | |
398 | /* This list of program error signals is from the GNU Libc | |
399 | Reference Manual */ | |
400 | case SIGFPE: | |
401 | case SIGILL: | |
402 | case SIGSEGV: | |
82893676 | 403 | #ifdef SIGBUS |
0d172d3f | 404 | case SIGBUS: |
82893676 | 405 | #endif |
0d172d3f | 406 | case SIGABRT: |
6732de1b | 407 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
408 | case SIGIOT: |
409 | #endif | |
82893676 | 410 | #ifdef SIGTRAP |
0d172d3f | 411 | case SIGTRAP: |
82893676 | 412 | #endif |
0d172d3f MV |
413 | #ifdef SIGEMT |
414 | case SIGEMT: | |
415 | #endif | |
adb2c53b | 416 | #ifdef SIGSYS |
0d172d3f | 417 | case SIGSYS: |
adb2c53b | 418 | #endif |
0d172d3f MV |
419 | query_only = 1; |
420 | } | |
421 | ||
e1a191a8 GH |
422 | #ifdef HAVE_SIGACTION |
423 | if (query_only) | |
424 | { | |
425 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 426 | SCM_SYSERROR; |
e1a191a8 GH |
427 | } |
428 | else | |
429 | { | |
430 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 431 | SCM_SYSERROR; |
e1a191a8 GH |
432 | if (save_handler) |
433 | orig_handlers[csig] = old_action; | |
434 | } | |
435 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
b9bd8526 | 436 | old_handler = scm_from_long ((long) old_action.sa_handler); |
9de87eea | 437 | SCM_CRITICAL_SECTION_END; |
e11e83f3 | 438 | return scm_cons (old_handler, scm_from_int (old_action.sa_flags)); |
e1a191a8 GH |
439 | #else |
440 | if (query_only) | |
441 | { | |
442 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 443 | SCM_SYSERROR; |
e1a191a8 | 444 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 445 | SCM_SYSERROR; |
e1a191a8 GH |
446 | } |
447 | else | |
448 | { | |
449 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 450 | SCM_SYSERROR; |
e1a191a8 GH |
451 | if (save_handler) |
452 | orig_handlers[csig] = old_chandler; | |
453 | } | |
454 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
b9bd8526 | 455 | old_handler = scm_from_long ((long) old_chandler); |
9de87eea | 456 | SCM_CRITICAL_SECTION_END; |
e11e83f3 | 457 | return scm_cons (old_handler, scm_from_int (0)); |
0f2d19dd | 458 | #endif |
e1a191a8 | 459 | } |
1bbd0b84 | 460 | #undef FUNC_NAME |
e1a191a8 | 461 | |
adb2c53b | 462 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 463 | (void), |
b380b885 MD |
464 | "Return all signal handlers to the values they had before any call to\n" |
465 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 466 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
467 | { |
468 | int i; | |
e1a191a8 GH |
469 | for (i = 0; i < NSIG; i++) |
470 | { | |
471 | #ifdef HAVE_SIGACTION | |
472 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
473 | { | |
474 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 475 | SCM_SYSERROR; |
e1a191a8 | 476 | orig_handlers[i].sa_handler = SIG_ERR; |
4057a3e0 | 477 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
478 | } |
479 | #else | |
480 | if (orig_handlers[i] != SIG_ERR) | |
481 | { | |
482 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 483 | SCM_SYSERROR; |
e1a191a8 | 484 | orig_handlers[i] = SIG_ERR; |
4057a3e0 | 485 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
486 | } |
487 | #endif | |
488 | } | |
489 | return SCM_UNSPECIFIED; | |
490 | } | |
1bbd0b84 | 491 | #undef FUNC_NAME |
0f2d19dd | 492 | |
c8e839cf | 493 | #if HAVE_DECL_ALARM |
adb2c53b | 494 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 495 | (SCM i), |
b380b885 MD |
496 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
497 | "number of seconds (an integer). It's advisable to install a signal\n" | |
498 | "handler for\n" | |
499 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
500 | "the process.\n\n" | |
501 | "The return value indicates the time remaining for the previous alarm,\n" | |
502 | "if any. The new value replaces the previous alarm. If there was\n" | |
503 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 504 | #define FUNC_NAME s_scm_alarm |
0f2d19dd | 505 | { |
a55c2b68 | 506 | return scm_from_uint (alarm (scm_to_uint (i))); |
0f2d19dd | 507 | } |
1bbd0b84 | 508 | #undef FUNC_NAME |
cdd125e8 | 509 | #endif /* HAVE_ALARM */ |
0f2d19dd | 510 | |
53f8a0d2 RB |
511 | #ifdef HAVE_SETITIMER |
512 | SCM_DEFINE (scm_setitimer, "setitimer", 5, 0, 0, | |
513 | (SCM which_timer, | |
514 | SCM interval_seconds, SCM interval_microseconds, | |
515 | SCM value_seconds, SCM value_microseconds), | |
516 | "Set the timer specified by @var{which_timer} according to the given\n" | |
517 | "@var{interval_seconds}, @var{interval_microseconds},\n" | |
518 | "@var{value_seconds}, and @var{value_microseconds} values.\n" | |
519 | "\n" | |
520 | "Return information about the timer's previous setting." | |
521 | "\n" | |
522 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
523 | "Interface Conventions''.\n" | |
524 | "\n" | |
9401323e | 525 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
526 | "and @code{ITIMER_PROF}.\n" |
527 | "\n" | |
528 | "The return value will be a list of two cons pairs representing the\n" | |
529 | "current state of the given timer. The first pair is the seconds and\n" | |
530 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 531 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
532 | #define FUNC_NAME s_scm_setitimer |
533 | { | |
534 | int rv; | |
535 | int c_which_timer; | |
536 | struct itimerval new_timer; | |
537 | struct itimerval old_timer; | |
538 | ||
539 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
540 | new_timer.it_interval.tv_sec = SCM_NUM2LONG(2, interval_seconds); | |
541 | new_timer.it_interval.tv_usec = SCM_NUM2LONG(3, interval_microseconds); | |
542 | new_timer.it_value.tv_sec = SCM_NUM2LONG(4, value_seconds); | |
543 | new_timer.it_value.tv_usec = SCM_NUM2LONG(5, value_microseconds); | |
544 | ||
545 | SCM_SYSCALL(rv = setitimer(c_which_timer, &new_timer, &old_timer)); | |
546 | ||
547 | if(rv != 0) | |
548 | SCM_SYSERROR; | |
549 | ||
b9bd8526 MV |
550 | return scm_list_2 (scm_cons (scm_from_long (old_timer.it_interval.tv_sec), |
551 | scm_from_long (old_timer.it_interval.tv_usec)), | |
552 | scm_cons (scm_from_long (old_timer.it_value.tv_sec), | |
553 | scm_from_long (old_timer.it_value.tv_usec))); | |
53f8a0d2 RB |
554 | } |
555 | #undef FUNC_NAME | |
556 | #endif /* HAVE_SETITIMER */ | |
557 | ||
558 | #ifdef HAVE_GETITIMER | |
559 | SCM_DEFINE (scm_getitimer, "getitimer", 1, 0, 0, | |
560 | (SCM which_timer), | |
561 | "Return information about the timer specified by @var{which_timer}" | |
562 | "\n" | |
563 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
564 | "Interface Conventions''.\n" | |
565 | "\n" | |
9401323e | 566 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
567 | "and @code{ITIMER_PROF}.\n" |
568 | "\n" | |
569 | "The return value will be a list of two cons pairs representing the\n" | |
570 | "current state of the given timer. The first pair is the seconds and\n" | |
571 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 572 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
573 | #define FUNC_NAME s_scm_getitimer |
574 | { | |
575 | int rv; | |
576 | int c_which_timer; | |
577 | struct itimerval old_timer; | |
578 | ||
579 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
580 | ||
581 | SCM_SYSCALL(rv = getitimer(c_which_timer, &old_timer)); | |
582 | ||
583 | if(rv != 0) | |
584 | SCM_SYSERROR; | |
585 | ||
b9bd8526 MV |
586 | return scm_list_2 (scm_cons (scm_from_long (old_timer.it_interval.tv_sec), |
587 | scm_from_long (old_timer.it_interval.tv_usec)), | |
588 | scm_cons (scm_from_long (old_timer.it_value.tv_sec), | |
589 | scm_from_long (old_timer.it_value.tv_usec))); | |
53f8a0d2 RB |
590 | } |
591 | #undef FUNC_NAME | |
592 | #endif /* HAVE_GETITIMER */ | |
593 | ||
0e958795 | 594 | #ifdef HAVE_PAUSE |
adb2c53b | 595 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 596 | (), |
b380b885 MD |
597 | "Pause the current process (thread?) until a signal arrives whose\n" |
598 | "action is to either terminate the current process or invoke a\n" | |
599 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 600 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
601 | { |
602 | pause (); | |
603 | return SCM_UNSPECIFIED; | |
604 | } | |
1bbd0b84 | 605 | #undef FUNC_NAME |
0e958795 | 606 | #endif |
0f2d19dd | 607 | |
adb2c53b | 608 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 609 | (SCM i), |
b380b885 MD |
610 | "Wait for the given number of seconds (an integer) or until a signal\n" |
611 | "arrives. The return value is zero if the time elapses or the number\n" | |
651f2cd2 KR |
612 | "of seconds remaining otherwise.\n" |
613 | "\n" | |
614 | "See also @code{usleep}.") | |
1bbd0b84 | 615 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 616 | { |
9de87eea | 617 | return scm_from_uint (scm_std_sleep (scm_to_uint (i))); |
0f2d19dd | 618 | } |
1bbd0b84 | 619 | #undef FUNC_NAME |
0f2d19dd | 620 | |
adb2c53b | 621 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 622 | (SCM i), |
651f2cd2 KR |
623 | "Wait the given period @var{usecs} microseconds (an integer).\n" |
624 | "If a signal arrives the wait stops and the return value is the\n" | |
625 | "time remaining, in microseconds. If the period elapses with no\n" | |
626 | "signal the return is zero.\n" | |
627 | "\n" | |
628 | "On most systems the process scheduler is not microsecond accurate and\n" | |
629 | "the actual period slept by @code{usleep} may be rounded to a system\n" | |
630 | "clock tick boundary. Traditionally such ticks were 10 milliseconds\n" | |
631 | "apart, and that interval is often still used.\n" | |
632 | "\n" | |
633 | "See also @code{sleep}.") | |
1bbd0b84 | 634 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 635 | { |
9de87eea | 636 | return scm_from_ulong (scm_std_usleep (scm_to_ulong (i))); |
b74f4728 | 637 | } |
1bbd0b84 | 638 | #undef FUNC_NAME |
ce874f2d | 639 | |
adb2c53b | 640 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 641 | (SCM sig), |
b380b885 MD |
642 | "Sends a specified signal @var{sig} to the current process, where\n" |
643 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 644 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 645 | { |
23d72566 | 646 | if (raise (scm_to_int (sig)) != 0) |
1bbd0b84 | 647 | SCM_SYSERROR; |
e1a191a8 | 648 | return SCM_UNSPECIFIED; |
0f2d19dd | 649 | } |
1bbd0b84 | 650 | #undef FUNC_NAME |
0f2d19dd JB |
651 | |
652 | \f | |
0f2d19dd | 653 | |
2e77f720 LC |
654 | void |
655 | scm_i_close_signal_pipe() | |
656 | { | |
657 | /* SIGNAL_DELIVERY_THREAD_MUTEX is only locked while the signal delivery | |
658 | thread is being launched. The thread that calls this function is | |
659 | already holding the thread admin mutex, so if the delivery thread hasn't | |
660 | been launched at this point, it never will be before shutdown. */ | |
661 | scm_i_pthread_mutex_lock (&signal_delivery_thread_mutex); | |
662 | ||
70eca635 | 663 | #if SCM_USE_PTHREAD_THREADS |
2e77f720 LC |
664 | if (scm_i_signal_delivery_thread != NULL) |
665 | close (signal_pipe[1]); | |
70eca635 | 666 | #endif |
2e77f720 LC |
667 | |
668 | scm_i_pthread_mutex_unlock (&signal_delivery_thread_mutex); | |
669 | } | |
670 | ||
e1a191a8 GH |
671 | void |
672 | scm_init_scmsigs () | |
0f2d19dd | 673 | { |
e1a191a8 GH |
674 | int i; |
675 | ||
676 | signal_handlers = | |
86d31dfe MV |
677 | SCM_VARIABLE_LOC (scm_c_define ("signal-handlers", |
678 | scm_c_make_vector (NSIG, SCM_BOOL_F))); | |
f39448c5 AW |
679 | signal_handler_asyncs = scm_c_make_vector (NSIG, SCM_BOOL_F); |
680 | signal_handler_threads = scm_c_make_vector (NSIG, SCM_BOOL_F); | |
e1a191a8 GH |
681 | |
682 | for (i = 0; i < NSIG; i++) | |
683 | { | |
e1a191a8 GH |
684 | #ifdef HAVE_SIGACTION |
685 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 686 | |
e1a191a8 GH |
687 | #else |
688 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 689 | #endif |
e1a191a8 | 690 | } |
1cc91f1b | 691 | |
b9bd8526 MV |
692 | scm_c_define ("NSIG", scm_from_long (NSIG)); |
693 | scm_c_define ("SIG_IGN", scm_from_long ((long) SIG_IGN)); | |
694 | scm_c_define ("SIG_DFL", scm_from_long ((long) SIG_DFL)); | |
e1a191a8 | 695 | #ifdef SA_NOCLDSTOP |
b9bd8526 | 696 | scm_c_define ("SA_NOCLDSTOP", scm_from_long (SA_NOCLDSTOP)); |
0f2d19dd | 697 | #endif |
e1a191a8 | 698 | #ifdef SA_RESTART |
b9bd8526 | 699 | scm_c_define ("SA_RESTART", scm_from_long (SA_RESTART)); |
0f2d19dd | 700 | #endif |
1cc91f1b | 701 | |
53f8a0d2 RB |
702 | #if defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) |
703 | /* Stuff needed by setitimer and getitimer. */ | |
e11e83f3 MV |
704 | scm_c_define ("ITIMER_REAL", scm_from_int (ITIMER_REAL)); |
705 | scm_c_define ("ITIMER_VIRTUAL", scm_from_int (ITIMER_VIRTUAL)); | |
706 | scm_c_define ("ITIMER_PROF", scm_from_int (ITIMER_PROF)); | |
53f8a0d2 RB |
707 | #endif /* defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) */ |
708 | ||
a0599745 | 709 | #include "libguile/scmsigs.x" |
0f2d19dd JB |
710 | } |
711 | ||
89e00824 ML |
712 | |
713 | /* | |
714 | Local Variables: | |
715 | c-file-style: "gnu" | |
716 | End: | |
717 | */ |