Commit | Line | Data |
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af4081e9 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2004, 2006, 2007, 2008, 2009, 2011 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 | ||
a0599745 | 31 | #include "libguile/_scm.h" |
0f2d19dd | 32 | |
a0599745 MD |
33 | #include "libguile/async.h" |
34 | #include "libguile/eval.h" | |
fdc28395 | 35 | #include "libguile/root.h" |
a0599745 | 36 | #include "libguile/vectors.h" |
2e77f720 | 37 | #include "libguile/threads.h" |
1bbd0b84 | 38 | |
a0599745 MD |
39 | #include "libguile/validate.h" |
40 | #include "libguile/scmsigs.h" | |
20e6290e | 41 | |
23d72566 KR |
42 | #ifdef HAVE_PROCESS_H |
43 | #include <process.h> /* for mingw */ | |
44 | #endif | |
45 | ||
0f2d19dd JB |
46 | #ifdef HAVE_UNISTD_H |
47 | #include <unistd.h> | |
48 | #endif | |
49 | ||
1bed8c28 GH |
50 | #ifdef HAVE_SYS_TIME_H |
51 | #include <sys/time.h> | |
52 | #endif | |
53 | ||
82893676 MG |
54 | #ifdef __MINGW32__ |
55 | #include <windows.h> | |
56 | #define alarm(sec) (0) | |
57 | /* This weird comma expression is because Sleep is void under Windows. */ | |
58 | #define sleep(sec) (Sleep ((sec) * 1000), 0) | |
ed618cc9 | 59 | #define usleep(usec) (Sleep ((usec) / 1000), 0) |
82893676 MG |
60 | #endif |
61 | ||
634aa8de LC |
62 | #include <full-write.h> |
63 | ||
64 | ||
0f2d19dd JB |
65 | \f |
66 | ||
e1a191a8 | 67 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
68 | |
69 | #ifdef RETSIGTYPE | |
e1a191a8 | 70 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 71 | #else |
e1a191a8 GH |
72 | # ifdef STDC_HEADERS |
73 | # define SIGRETTYPE void | |
74 | # else | |
75 | # define SIGRETTYPE int | |
76 | # endif | |
0f2d19dd JB |
77 | #endif |
78 | ||
79 | \f | |
80 | ||
e1a191a8 | 81 | /* take_signal is installed as the C signal handler whenever a Scheme |
9de87eea MV |
82 | handler is set. When a signal arrives, take_signal will write a |
83 | byte into the 'signal pipe'. The 'signal delivery thread' will | |
84 | read this pipe and queue the appropriate asyncs. | |
85 | ||
86 | When Guile is built without threads, the signal handler will | |
87 | install the async directly. | |
88 | */ | |
0f2d19dd | 89 | |
0f2d19dd | 90 | |
2fbc8609 | 91 | /* Scheme vectors with information about a signal. signal_handlers |
9de87eea MV |
92 | contains the handler procedure or #f, signal_handler_asyncs |
93 | contains the thunk to be marked as an async when the signal arrives | |
94 | (or the cell with the thunk in a singlethreaded Guile), and | |
dbbaa07c MV |
95 | signal_handler_threads points to the thread that a signal should be |
96 | delivered to. | |
2fbc8609 | 97 | */ |
e1a191a8 | 98 | static SCM *signal_handlers; |
9de87eea | 99 | static SCM signal_handler_asyncs; |
2fbc8609 | 100 | static SCM signal_handler_threads; |
0f2d19dd | 101 | |
2e77f720 LC |
102 | /* The signal delivery thread. */ |
103 | scm_i_thread *scm_i_signal_delivery_thread = NULL; | |
104 | ||
105 | /* The mutex held when launching the signal delivery thread. */ | |
106 | static scm_i_pthread_mutex_t signal_delivery_thread_mutex = | |
107 | SCM_I_PTHREAD_MUTEX_INITIALIZER; | |
108 | ||
109 | ||
e1a191a8 GH |
110 | /* saves the original C handlers, when a new handler is installed. |
111 | set to SIG_ERR if the original handler is installed. */ | |
112 | #ifdef HAVE_SIGACTION | |
113 | static struct sigaction orig_handlers[NSIG]; | |
114 | #else | |
da6e81b6 | 115 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
116 | #endif |
117 | ||
9de87eea MV |
118 | static SCM |
119 | close_1 (SCM proc, SCM arg) | |
120 | { | |
121 | return scm_primitive_eval_x (scm_list_3 (scm_sym_lambda, SCM_EOL, | |
122 | scm_list_2 (proc, arg))); | |
123 | } | |
124 | ||
125 | #if SCM_USE_PTHREAD_THREADS | |
23d72566 KR |
126 | /* On mingw there's no notion of inter-process signals, only a raise() |
127 | within the process itself which apparently invokes the registered handler | |
128 | immediately. Not sure how well the following code will cope in this | |
129 | case. It builds but it may not offer quite the same scheme-level | |
130 | semantics as on a proper system. If you're relying on much in the way of | |
131 | signal handling on mingw you probably lose anyway. */ | |
9de87eea MV |
132 | |
133 | static int signal_pipe[2]; | |
dbbaa07c | 134 | |
e1a191a8 GH |
135 | static SIGRETTYPE |
136 | take_signal (int signum) | |
137 | { | |
9de87eea | 138 | char sigbyte = signum; |
634aa8de | 139 | full_write (signal_pipe[1], &sigbyte, 1); |
9de87eea | 140 | |
2fbc8609 MV |
141 | #ifndef HAVE_SIGACTION |
142 | signal (signum, take_signal); | |
143 | #endif | |
e1a191a8 | 144 | } |
0f2d19dd | 145 | |
af4081e9 AW |
146 | struct signal_pipe_data |
147 | { | |
148 | char sigbyte; | |
149 | ssize_t n; | |
150 | int err; | |
151 | }; | |
152 | ||
153 | static void* | |
154 | read_signal_pipe_data (void * data) | |
155 | { | |
156 | struct signal_pipe_data *sdata = data; | |
157 | ||
158 | sdata->n = read (signal_pipe[0], &sdata->sigbyte, 1); | |
159 | sdata->err = errno; | |
160 | ||
161 | return NULL; | |
162 | } | |
163 | ||
9de87eea MV |
164 | static SCM |
165 | signal_delivery_thread (void *data) | |
e1a191a8 | 166 | { |
af4081e9 | 167 | int sig; |
23d72566 KR |
168 | #if HAVE_PTHREAD_SIGMASK /* not on mingw, see notes above */ |
169 | sigset_t all_sigs; | |
9de87eea MV |
170 | sigfillset (&all_sigs); |
171 | scm_i_pthread_sigmask (SIG_SETMASK, &all_sigs, NULL); | |
23d72566 | 172 | #endif |
9de87eea MV |
173 | |
174 | while (1) | |
175 | { | |
af4081e9 AW |
176 | struct signal_pipe_data sigdata; |
177 | ||
178 | scm_without_guile (read_signal_pipe_data, &sigdata); | |
179 | ||
180 | sig = sigdata.sigbyte; | |
181 | if (sigdata.n == 1 && sig >= 0 && sig < NSIG) | |
9de87eea MV |
182 | { |
183 | SCM h, t; | |
184 | ||
185 | h = SCM_SIMPLE_VECTOR_REF (signal_handler_asyncs, sig); | |
186 | t = SCM_SIMPLE_VECTOR_REF (signal_handler_threads, sig); | |
187 | if (scm_is_true (h)) | |
188 | scm_system_async_mark_for_thread (h, t); | |
189 | } | |
af4081e9 | 190 | else if (sigdata.n == 0) |
2e77f720 | 191 | break; /* the signal pipe was closed. */ |
af4081e9 | 192 | else if (sigdata.n < 0 && sigdata.err != EINTR) |
9de87eea MV |
193 | perror ("error in signal delivery thread"); |
194 | } | |
229a0710 | 195 | |
2e77f720 | 196 | return SCM_UNSPECIFIED; /* not reached unless all other threads exited */ |
2fbc8609 | 197 | } |
e1a191a8 | 198 | |
9de87eea MV |
199 | static void |
200 | start_signal_delivery_thread (void) | |
2fbc8609 | 201 | { |
2e77f720 LC |
202 | SCM signal_thread; |
203 | ||
204 | scm_i_pthread_mutex_lock (&signal_delivery_thread_mutex); | |
205 | ||
32f94bf2 | 206 | if (pipe2 (signal_pipe, O_CLOEXEC) != 0) |
9de87eea | 207 | scm_syserror (NULL); |
2e77f720 LC |
208 | signal_thread = scm_spawn_thread (signal_delivery_thread, NULL, |
209 | scm_handle_by_message, | |
210 | "signal delivery thread"); | |
211 | scm_i_signal_delivery_thread = SCM_I_THREAD_DATA (signal_thread); | |
212 | ||
213 | scm_i_pthread_mutex_unlock (&signal_delivery_thread_mutex); | |
0f2d19dd JB |
214 | } |
215 | ||
2e77f720 LC |
216 | void |
217 | scm_i_ensure_signal_delivery_thread () | |
9de87eea MV |
218 | { |
219 | static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT; | |
220 | scm_i_pthread_once (&once, start_signal_delivery_thread); | |
221 | } | |
dbbaa07c | 222 | |
9de87eea | 223 | #else /* !SCM_USE_PTHREAD_THREADS */ |
dbbaa07c | 224 | |
9de87eea MV |
225 | static SIGRETTYPE |
226 | take_signal (int signum) | |
dbbaa07c | 227 | { |
9de87eea MV |
228 | SCM cell = SCM_SIMPLE_VECTOR_REF (signal_handler_asyncs, signum); |
229 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
230 | ||
231 | if (scm_is_false (SCM_CDR (cell))) | |
dbbaa07c | 232 | { |
9de87eea MV |
233 | SCM_SETCDR (cell, t->active_asyncs); |
234 | t->active_asyncs = cell; | |
235 | t->pending_asyncs = 1; | |
dbbaa07c | 236 | } |
9de87eea MV |
237 | |
238 | #ifndef HAVE_SIGACTION | |
239 | signal (signum, take_signal); | |
240 | #endif | |
dbbaa07c MV |
241 | } |
242 | ||
2e77f720 LC |
243 | void |
244 | scm_i_ensure_signal_delivery_thread () | |
dbbaa07c | 245 | { |
9de87eea MV |
246 | return; |
247 | } | |
dbbaa07c | 248 | |
9de87eea | 249 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
dbbaa07c | 250 | |
9de87eea MV |
251 | static void |
252 | install_handler (int signum, SCM thread, SCM handler) | |
253 | { | |
7888309b | 254 | if (scm_is_false (handler)) |
dbbaa07c | 255 | { |
4057a3e0 | 256 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, signum, SCM_BOOL_F); |
9de87eea | 257 | SCM_SIMPLE_VECTOR_SET (signal_handler_asyncs, signum, SCM_BOOL_F); |
dbbaa07c MV |
258 | } |
259 | else | |
260 | { | |
9de87eea MV |
261 | SCM async = close_1 (handler, scm_from_int (signum)); |
262 | #if !SCM_USE_PTHREAD_THREADS | |
263 | async = scm_cons (async, SCM_BOOL_F); | |
264 | #endif | |
4057a3e0 | 265 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, signum, handler); |
9de87eea | 266 | SCM_SIMPLE_VECTOR_SET (signal_handler_asyncs, signum, async); |
dbbaa07c MV |
267 | } |
268 | ||
9de87eea | 269 | SCM_SIMPLE_VECTOR_SET (signal_handler_threads, signum, thread); |
dbbaa07c MV |
270 | } |
271 | ||
9de87eea MV |
272 | SCM |
273 | scm_sigaction (SCM signum, SCM handler, SCM flags) | |
dbbaa07c | 274 | { |
9de87eea | 275 | return scm_sigaction_for_thread (signum, handler, flags, SCM_UNDEFINED); |
dbbaa07c MV |
276 | } |
277 | ||
e1a191a8 | 278 | /* user interface for installation of signal handlers. */ |
2fbc8609 MV |
279 | SCM_DEFINE (scm_sigaction_for_thread, "sigaction", 1, 3, 0, |
280 | (SCM signum, SCM handler, SCM flags, SCM thread), | |
0d172d3f | 281 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
282 | "@var{signum} is the signal number, which can be specified using the value\n" |
283 | "of variables such as @code{SIGINT}.\n\n" | |
2fbc8609 | 284 | "If @var{handler} is omitted, @code{sigaction} returns a pair: the\n" |
b380b885 MD |
285 | "CAR is the current\n" |
286 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
287 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
288 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
289 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
2fbc8609 MV |
290 | "If @var{handler} is provided, it is installed as the new handler for\n" |
291 | "@var{signum}. @var{handler} can be a Scheme procedure taking one\n" | |
b380b885 MD |
292 | "argument, or the value of @code{SIG_DFL} (default action) or\n" |
293 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
2fbc8609 MV |
294 | "was installed before @code{sigaction} was first used. When\n" |
295 | "a scheme procedure has been specified, that procedure will run\n" | |
296 | "in the given @var{thread}. When no thread has been given, the\n" | |
297 | "thread that made this call to @code{sigaction} is used.\n" | |
0ebbcf43 NJ |
298 | "Flags can optionally be specified for the new handler.\n" |
299 | "The return value is a pair with information about the\n" | |
b380b885 MD |
300 | "old handler as described above.\n\n" |
301 | "This interface does not provide access to the \"signal blocking\"\n" | |
302 | "facility. Maybe this is not needed, since the thread support may\n" | |
303 | "provide solutions to the problem of consistent access to data\n" | |
304 | "structures.") | |
2fbc8609 | 305 | #define FUNC_NAME s_scm_sigaction_for_thread |
e1a191a8 GH |
306 | { |
307 | int csig; | |
308 | #ifdef HAVE_SIGACTION | |
309 | struct sigaction action; | |
310 | struct sigaction old_action; | |
311 | #else | |
af68e5e5 | 312 | SIGRETTYPE (* chandler) (int) = SIG_DFL; |
e1a191a8 GH |
313 | SIGRETTYPE (* old_chandler) (int); |
314 | #endif | |
315 | int query_only = 0; | |
316 | int save_handler = 0; | |
34d19ef6 | 317 | |
e1a191a8 GH |
318 | SCM old_handler; |
319 | ||
a55c2b68 MV |
320 | csig = scm_to_signed_integer (signum, 0, NSIG-1); |
321 | ||
7ee92fce | 322 | #if defined(HAVE_SIGACTION) |
e1a191a8 | 323 | action.sa_flags = 0; |
e1a191a8 | 324 | if (!SCM_UNBNDP (flags)) |
a55c2b68 | 325 | action.sa_flags |= scm_to_int (flags); |
e1a191a8 | 326 | sigemptyset (&action.sa_mask); |
4feac0b9 MV |
327 | #endif |
328 | ||
2fbc8609 MV |
329 | if (SCM_UNBNDP (thread)) |
330 | thread = scm_current_thread (); | |
331 | else | |
dbbaa07c MV |
332 | { |
333 | SCM_VALIDATE_THREAD (4, thread); | |
334 | if (scm_c_thread_exited_p (thread)) | |
335 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
336 | } | |
4feac0b9 | 337 | |
2e77f720 | 338 | scm_i_ensure_signal_delivery_thread (); |
9de87eea MV |
339 | |
340 | SCM_CRITICAL_SECTION_START; | |
4057a3e0 | 341 | old_handler = SCM_SIMPLE_VECTOR_REF (*signal_handlers, csig); |
e1a191a8 GH |
342 | if (SCM_UNBNDP (handler)) |
343 | query_only = 1; | |
e11e83f3 | 344 | else if (scm_is_integer (handler)) |
e1a191a8 | 345 | { |
9de87eea MV |
346 | long handler_int = scm_to_long (handler); |
347 | ||
348 | if (handler_int == (long) SIG_DFL || handler_int == (long) SIG_IGN) | |
e1a191a8 GH |
349 | { |
350 | #ifdef HAVE_SIGACTION | |
9de87eea | 351 | action.sa_handler = (SIGRETTYPE (*) (int)) handler_int; |
e1a191a8 | 352 | #else |
9de87eea | 353 | chandler = (SIGRETTYPE (*) (int)) handler_int; |
e1a191a8 | 354 | #endif |
dbbaa07c | 355 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
356 | } |
357 | else | |
09d978f3 NJ |
358 | { |
359 | SCM_CRITICAL_SECTION_END; | |
360 | SCM_OUT_OF_RANGE (2, handler); | |
361 | } | |
e1a191a8 | 362 | } |
7888309b | 363 | else if (scm_is_false (handler)) |
e1a191a8 GH |
364 | { |
365 | /* restore the default handler. */ | |
366 | #ifdef HAVE_SIGACTION | |
367 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
368 | query_only = 1; | |
369 | else | |
370 | { | |
371 | action = orig_handlers[csig]; | |
372 | orig_handlers[csig].sa_handler = SIG_ERR; | |
dbbaa07c | 373 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
374 | } |
375 | #else | |
376 | if (orig_handlers[csig] == SIG_ERR) | |
377 | query_only = 1; | |
378 | else | |
379 | { | |
380 | chandler = orig_handlers[csig]; | |
381 | orig_handlers[csig] = SIG_ERR; | |
dbbaa07c | 382 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
383 | } |
384 | #endif | |
adb2c53b | 385 | } |
e1a191a8 GH |
386 | else |
387 | { | |
43067cec | 388 | SCM_VALIDATE_PROC (2, handler); |
e1a191a8 GH |
389 | #ifdef HAVE_SIGACTION |
390 | action.sa_handler = take_signal; | |
391 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
392 | save_handler = 1; | |
393 | #else | |
394 | chandler = take_signal; | |
395 | if (orig_handlers[csig] == SIG_ERR) | |
396 | save_handler = 1; | |
397 | #endif | |
dbbaa07c | 398 | install_handler (csig, thread, handler); |
e1a191a8 | 399 | } |
adb2c53b | 400 | |
0d172d3f MV |
401 | /* XXX - Silently ignore setting handlers for `program error signals' |
402 | because they can't currently be handled by Scheme code. | |
403 | */ | |
404 | ||
405 | switch (csig) | |
406 | { | |
407 | /* This list of program error signals is from the GNU Libc | |
408 | Reference Manual */ | |
409 | case SIGFPE: | |
410 | case SIGILL: | |
411 | case SIGSEGV: | |
82893676 | 412 | #ifdef SIGBUS |
0d172d3f | 413 | case SIGBUS: |
82893676 | 414 | #endif |
0d172d3f | 415 | case SIGABRT: |
6732de1b | 416 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
417 | case SIGIOT: |
418 | #endif | |
82893676 | 419 | #ifdef SIGTRAP |
0d172d3f | 420 | case SIGTRAP: |
82893676 | 421 | #endif |
0d172d3f MV |
422 | #ifdef SIGEMT |
423 | case SIGEMT: | |
424 | #endif | |
adb2c53b | 425 | #ifdef SIGSYS |
0d172d3f | 426 | case SIGSYS: |
adb2c53b | 427 | #endif |
0d172d3f MV |
428 | query_only = 1; |
429 | } | |
430 | ||
e1a191a8 GH |
431 | #ifdef HAVE_SIGACTION |
432 | if (query_only) | |
433 | { | |
434 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 435 | SCM_SYSERROR; |
e1a191a8 GH |
436 | } |
437 | else | |
438 | { | |
439 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 440 | SCM_SYSERROR; |
e1a191a8 GH |
441 | if (save_handler) |
442 | orig_handlers[csig] = old_action; | |
443 | } | |
444 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
b9bd8526 | 445 | old_handler = scm_from_long ((long) old_action.sa_handler); |
9de87eea | 446 | SCM_CRITICAL_SECTION_END; |
e11e83f3 | 447 | return scm_cons (old_handler, scm_from_int (old_action.sa_flags)); |
e1a191a8 GH |
448 | #else |
449 | if (query_only) | |
450 | { | |
451 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 452 | SCM_SYSERROR; |
e1a191a8 | 453 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 454 | SCM_SYSERROR; |
e1a191a8 GH |
455 | } |
456 | else | |
457 | { | |
458 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 459 | SCM_SYSERROR; |
e1a191a8 GH |
460 | if (save_handler) |
461 | orig_handlers[csig] = old_chandler; | |
462 | } | |
463 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
b9bd8526 | 464 | old_handler = scm_from_long ((long) old_chandler); |
9de87eea | 465 | SCM_CRITICAL_SECTION_END; |
e11e83f3 | 466 | return scm_cons (old_handler, scm_from_int (0)); |
0f2d19dd | 467 | #endif |
e1a191a8 | 468 | } |
1bbd0b84 | 469 | #undef FUNC_NAME |
e1a191a8 | 470 | |
adb2c53b | 471 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 472 | (void), |
b380b885 MD |
473 | "Return all signal handlers to the values they had before any call to\n" |
474 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 475 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
476 | { |
477 | int i; | |
e1a191a8 GH |
478 | for (i = 0; i < NSIG; i++) |
479 | { | |
480 | #ifdef HAVE_SIGACTION | |
481 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
482 | { | |
483 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 484 | SCM_SYSERROR; |
e1a191a8 | 485 | orig_handlers[i].sa_handler = SIG_ERR; |
4057a3e0 | 486 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
487 | } |
488 | #else | |
489 | if (orig_handlers[i] != SIG_ERR) | |
490 | { | |
491 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 492 | SCM_SYSERROR; |
e1a191a8 | 493 | orig_handlers[i] = SIG_ERR; |
4057a3e0 | 494 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
495 | } |
496 | #endif | |
497 | } | |
498 | return SCM_UNSPECIFIED; | |
499 | } | |
1bbd0b84 | 500 | #undef FUNC_NAME |
0f2d19dd | 501 | |
adb2c53b | 502 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 503 | (SCM i), |
b380b885 MD |
504 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
505 | "number of seconds (an integer). It's advisable to install a signal\n" | |
506 | "handler for\n" | |
507 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
508 | "the process.\n\n" | |
509 | "The return value indicates the time remaining for the previous alarm,\n" | |
510 | "if any. The new value replaces the previous alarm. If there was\n" | |
511 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 512 | #define FUNC_NAME s_scm_alarm |
0f2d19dd | 513 | { |
a55c2b68 | 514 | return scm_from_uint (alarm (scm_to_uint (i))); |
0f2d19dd | 515 | } |
1bbd0b84 | 516 | #undef FUNC_NAME |
0f2d19dd | 517 | |
53f8a0d2 RB |
518 | #ifdef HAVE_SETITIMER |
519 | SCM_DEFINE (scm_setitimer, "setitimer", 5, 0, 0, | |
520 | (SCM which_timer, | |
521 | SCM interval_seconds, SCM interval_microseconds, | |
522 | SCM value_seconds, SCM value_microseconds), | |
523 | "Set the timer specified by @var{which_timer} according to the given\n" | |
524 | "@var{interval_seconds}, @var{interval_microseconds},\n" | |
525 | "@var{value_seconds}, and @var{value_microseconds} values.\n" | |
526 | "\n" | |
527 | "Return information about the timer's previous setting." | |
528 | "\n" | |
529 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
530 | "Interface Conventions''.\n" | |
531 | "\n" | |
9401323e | 532 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
533 | "and @code{ITIMER_PROF}.\n" |
534 | "\n" | |
535 | "The return value will be a list of two cons pairs representing the\n" | |
536 | "current state of the given timer. The first pair is the seconds and\n" | |
537 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 538 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
539 | #define FUNC_NAME s_scm_setitimer |
540 | { | |
541 | int rv; | |
542 | int c_which_timer; | |
543 | struct itimerval new_timer; | |
544 | struct itimerval old_timer; | |
545 | ||
546 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
547 | new_timer.it_interval.tv_sec = SCM_NUM2LONG(2, interval_seconds); | |
548 | new_timer.it_interval.tv_usec = SCM_NUM2LONG(3, interval_microseconds); | |
549 | new_timer.it_value.tv_sec = SCM_NUM2LONG(4, value_seconds); | |
550 | new_timer.it_value.tv_usec = SCM_NUM2LONG(5, value_microseconds); | |
551 | ||
552 | SCM_SYSCALL(rv = setitimer(c_which_timer, &new_timer, &old_timer)); | |
553 | ||
554 | if(rv != 0) | |
555 | SCM_SYSERROR; | |
556 | ||
b9bd8526 MV |
557 | return scm_list_2 (scm_cons (scm_from_long (old_timer.it_interval.tv_sec), |
558 | scm_from_long (old_timer.it_interval.tv_usec)), | |
559 | scm_cons (scm_from_long (old_timer.it_value.tv_sec), | |
560 | scm_from_long (old_timer.it_value.tv_usec))); | |
53f8a0d2 RB |
561 | } |
562 | #undef FUNC_NAME | |
563 | #endif /* HAVE_SETITIMER */ | |
564 | ||
565 | #ifdef HAVE_GETITIMER | |
566 | SCM_DEFINE (scm_getitimer, "getitimer", 1, 0, 0, | |
567 | (SCM which_timer), | |
568 | "Return information about the timer specified by @var{which_timer}" | |
569 | "\n" | |
570 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
571 | "Interface Conventions''.\n" | |
572 | "\n" | |
9401323e | 573 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
574 | "and @code{ITIMER_PROF}.\n" |
575 | "\n" | |
576 | "The return value will be a list of two cons pairs representing the\n" | |
577 | "current state of the given timer. The first pair is the seconds and\n" | |
578 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 579 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
580 | #define FUNC_NAME s_scm_getitimer |
581 | { | |
582 | int rv; | |
583 | int c_which_timer; | |
584 | struct itimerval old_timer; | |
585 | ||
586 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
587 | ||
588 | SCM_SYSCALL(rv = getitimer(c_which_timer, &old_timer)); | |
589 | ||
590 | if(rv != 0) | |
591 | SCM_SYSERROR; | |
592 | ||
b9bd8526 MV |
593 | return scm_list_2 (scm_cons (scm_from_long (old_timer.it_interval.tv_sec), |
594 | scm_from_long (old_timer.it_interval.tv_usec)), | |
595 | scm_cons (scm_from_long (old_timer.it_value.tv_sec), | |
596 | scm_from_long (old_timer.it_value.tv_usec))); | |
53f8a0d2 RB |
597 | } |
598 | #undef FUNC_NAME | |
599 | #endif /* HAVE_GETITIMER */ | |
600 | ||
0e958795 | 601 | #ifdef HAVE_PAUSE |
adb2c53b | 602 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 603 | (), |
b380b885 MD |
604 | "Pause the current process (thread?) until a signal arrives whose\n" |
605 | "action is to either terminate the current process or invoke a\n" | |
606 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 607 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
608 | { |
609 | pause (); | |
610 | return SCM_UNSPECIFIED; | |
611 | } | |
1bbd0b84 | 612 | #undef FUNC_NAME |
0e958795 | 613 | #endif |
0f2d19dd | 614 | |
adb2c53b | 615 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 616 | (SCM i), |
b380b885 MD |
617 | "Wait for the given number of seconds (an integer) or until a signal\n" |
618 | "arrives. The return value is zero if the time elapses or the number\n" | |
651f2cd2 KR |
619 | "of seconds remaining otherwise.\n" |
620 | "\n" | |
621 | "See also @code{usleep}.") | |
1bbd0b84 | 622 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 623 | { |
9de87eea | 624 | return scm_from_uint (scm_std_sleep (scm_to_uint (i))); |
0f2d19dd | 625 | } |
1bbd0b84 | 626 | #undef FUNC_NAME |
0f2d19dd | 627 | |
adb2c53b | 628 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 629 | (SCM i), |
651f2cd2 KR |
630 | "Wait the given period @var{usecs} microseconds (an integer).\n" |
631 | "If a signal arrives the wait stops and the return value is the\n" | |
632 | "time remaining, in microseconds. If the period elapses with no\n" | |
633 | "signal the return is zero.\n" | |
634 | "\n" | |
635 | "On most systems the process scheduler is not microsecond accurate and\n" | |
636 | "the actual period slept by @code{usleep} may be rounded to a system\n" | |
637 | "clock tick boundary. Traditionally such ticks were 10 milliseconds\n" | |
638 | "apart, and that interval is often still used.\n" | |
639 | "\n" | |
640 | "See also @code{sleep}.") | |
1bbd0b84 | 641 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 642 | { |
9de87eea | 643 | return scm_from_ulong (scm_std_usleep (scm_to_ulong (i))); |
b74f4728 | 644 | } |
1bbd0b84 | 645 | #undef FUNC_NAME |
ce874f2d | 646 | |
adb2c53b | 647 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 648 | (SCM sig), |
b380b885 MD |
649 | "Sends a specified signal @var{sig} to the current process, where\n" |
650 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 651 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 652 | { |
23d72566 | 653 | if (raise (scm_to_int (sig)) != 0) |
1bbd0b84 | 654 | SCM_SYSERROR; |
e1a191a8 | 655 | return SCM_UNSPECIFIED; |
0f2d19dd | 656 | } |
1bbd0b84 | 657 | #undef FUNC_NAME |
0f2d19dd JB |
658 | |
659 | \f | |
0f2d19dd | 660 | |
2e77f720 LC |
661 | void |
662 | scm_i_close_signal_pipe() | |
663 | { | |
664 | /* SIGNAL_DELIVERY_THREAD_MUTEX is only locked while the signal delivery | |
665 | thread is being launched. The thread that calls this function is | |
666 | already holding the thread admin mutex, so if the delivery thread hasn't | |
667 | been launched at this point, it never will be before shutdown. */ | |
668 | scm_i_pthread_mutex_lock (&signal_delivery_thread_mutex); | |
669 | ||
70eca635 | 670 | #if SCM_USE_PTHREAD_THREADS |
2e77f720 LC |
671 | if (scm_i_signal_delivery_thread != NULL) |
672 | close (signal_pipe[1]); | |
70eca635 | 673 | #endif |
2e77f720 LC |
674 | |
675 | scm_i_pthread_mutex_unlock (&signal_delivery_thread_mutex); | |
676 | } | |
677 | ||
e1a191a8 GH |
678 | void |
679 | scm_init_scmsigs () | |
0f2d19dd | 680 | { |
e1a191a8 GH |
681 | int i; |
682 | ||
683 | signal_handlers = | |
86d31dfe MV |
684 | SCM_VARIABLE_LOC (scm_c_define ("signal-handlers", |
685 | scm_c_make_vector (NSIG, SCM_BOOL_F))); | |
f39448c5 AW |
686 | signal_handler_asyncs = scm_c_make_vector (NSIG, SCM_BOOL_F); |
687 | signal_handler_threads = scm_c_make_vector (NSIG, SCM_BOOL_F); | |
e1a191a8 GH |
688 | |
689 | for (i = 0; i < NSIG; i++) | |
690 | { | |
e1a191a8 GH |
691 | #ifdef HAVE_SIGACTION |
692 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 693 | |
e1a191a8 GH |
694 | #else |
695 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 696 | #endif |
e1a191a8 | 697 | } |
1cc91f1b | 698 | |
b9bd8526 MV |
699 | scm_c_define ("NSIG", scm_from_long (NSIG)); |
700 | scm_c_define ("SIG_IGN", scm_from_long ((long) SIG_IGN)); | |
701 | scm_c_define ("SIG_DFL", scm_from_long ((long) SIG_DFL)); | |
e1a191a8 | 702 | #ifdef SA_NOCLDSTOP |
b9bd8526 | 703 | scm_c_define ("SA_NOCLDSTOP", scm_from_long (SA_NOCLDSTOP)); |
0f2d19dd | 704 | #endif |
e1a191a8 | 705 | #ifdef SA_RESTART |
b9bd8526 | 706 | scm_c_define ("SA_RESTART", scm_from_long (SA_RESTART)); |
0f2d19dd | 707 | #endif |
1cc91f1b | 708 | |
53f8a0d2 RB |
709 | #if defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) |
710 | /* Stuff needed by setitimer and getitimer. */ | |
e11e83f3 MV |
711 | scm_c_define ("ITIMER_REAL", scm_from_int (ITIMER_REAL)); |
712 | scm_c_define ("ITIMER_VIRTUAL", scm_from_int (ITIMER_VIRTUAL)); | |
713 | scm_c_define ("ITIMER_PROF", scm_from_int (ITIMER_PROF)); | |
53f8a0d2 RB |
714 | #endif /* defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) */ |
715 | ||
a0599745 | 716 | #include "libguile/scmsigs.x" |
0f2d19dd JB |
717 | } |
718 | ||
89e00824 ML |
719 | |
720 | /* | |
721 | Local Variables: | |
722 | c-file-style: "gnu" | |
723 | End: | |
724 | */ |