Commit | Line | Data |
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2e1fc2e8 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2004 Free Software Foundation, Inc. |
adb2c53b | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
adb2c53b | 7 | * |
73be1d9e | 8 | * This library is distributed in the hope that it will be useful, |
0f2d19dd | 9 | * but 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 | |
92205699 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 16 | */ |
1bbd0b84 | 17 | |
1bbd0b84 | 18 | |
0f2d19dd JB |
19 | \f |
20 | ||
29d36c2d RB |
21 | #if HAVE_CONFIG_H |
22 | # include <config.h> | |
23 | #endif | |
24 | ||
0f2d19dd | 25 | #include <signal.h> |
9de87eea | 26 | #include <stdio.h> |
e6e2e95a MD |
27 | #include <errno.h> |
28 | ||
a0599745 | 29 | #include "libguile/_scm.h" |
0f2d19dd | 30 | |
a0599745 MD |
31 | #include "libguile/async.h" |
32 | #include "libguile/eval.h" | |
fdc28395 | 33 | #include "libguile/root.h" |
a0599745 | 34 | #include "libguile/vectors.h" |
1bbd0b84 | 35 | |
a0599745 MD |
36 | #include "libguile/validate.h" |
37 | #include "libguile/scmsigs.h" | |
20e6290e | 38 | |
0f2d19dd JB |
39 | #ifdef HAVE_UNISTD_H |
40 | #include <unistd.h> | |
41 | #endif | |
42 | ||
1bed8c28 GH |
43 | #ifdef HAVE_SYS_TIME_H |
44 | #include <sys/time.h> | |
45 | #endif | |
46 | ||
82893676 MG |
47 | #ifdef __MINGW32__ |
48 | #include <windows.h> | |
49 | #define alarm(sec) (0) | |
50 | /* This weird comma expression is because Sleep is void under Windows. */ | |
51 | #define sleep(sec) (Sleep ((sec) * 1000), 0) | |
ed618cc9 | 52 | #define usleep(usec) (Sleep ((usec) / 1000), 0) |
82893676 MG |
53 | #define kill(pid, sig) raise (sig) |
54 | #endif | |
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 | |
e1a191a8 GH |
93 | /* saves the original C handlers, when a new handler is installed. |
94 | set to SIG_ERR if the original handler is installed. */ | |
95 | #ifdef HAVE_SIGACTION | |
96 | static struct sigaction orig_handlers[NSIG]; | |
97 | #else | |
da6e81b6 | 98 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
99 | #endif |
100 | ||
9de87eea MV |
101 | static SCM |
102 | close_1 (SCM proc, SCM arg) | |
103 | { | |
104 | return scm_primitive_eval_x (scm_list_3 (scm_sym_lambda, SCM_EOL, | |
105 | scm_list_2 (proc, arg))); | |
106 | } | |
107 | ||
108 | #if SCM_USE_PTHREAD_THREADS | |
109 | ||
110 | static int signal_pipe[2]; | |
dbbaa07c | 111 | |
e1a191a8 GH |
112 | static SIGRETTYPE |
113 | take_signal (int signum) | |
114 | { | |
9de87eea MV |
115 | char sigbyte = signum; |
116 | write (signal_pipe[1], &sigbyte, 1); | |
117 | ||
2fbc8609 MV |
118 | #ifndef HAVE_SIGACTION |
119 | signal (signum, take_signal); | |
120 | #endif | |
e1a191a8 | 121 | } |
0f2d19dd | 122 | |
324a5aa9 MV |
123 | typedef struct { |
124 | ssize_t res; | |
125 | int fd; | |
126 | char *buf; | |
127 | size_t n; | |
128 | } read_without_guile_data; | |
129 | ||
130 | static void * | |
131 | do_read_without_guile (void *raw_data) | |
132 | { | |
2824f4dc | 133 | read_without_guile_data *data = (read_without_guile_data *)raw_data; |
324a5aa9 MV |
134 | data->res = read (data->fd, data->buf, data->n); |
135 | return NULL; | |
136 | } | |
137 | ||
138 | static ssize_t | |
139 | read_without_guile (int fd, char *buf, size_t n) | |
140 | { | |
141 | read_without_guile_data data; | |
142 | data.fd = fd; | |
143 | data.buf = buf; | |
144 | data.n = n; | |
145 | scm_without_guile (do_read_without_guile, &data); | |
146 | return data.res; | |
147 | } | |
148 | ||
9de87eea MV |
149 | static SCM |
150 | signal_delivery_thread (void *data) | |
e1a191a8 | 151 | { |
9de87eea | 152 | sigset_t all_sigs; |
9de87eea MV |
153 | int n, sig; |
154 | char sigbyte; | |
155 | ||
156 | sigfillset (&all_sigs); | |
157 | scm_i_pthread_sigmask (SIG_SETMASK, &all_sigs, NULL); | |
158 | ||
159 | while (1) | |
160 | { | |
324a5aa9 | 161 | n = read_without_guile (signal_pipe[0], &sigbyte, 1); |
9de87eea | 162 | sig = sigbyte; |
9de87eea MV |
163 | if (n == 1 && sig >= 0 && sig < NSIG) |
164 | { | |
165 | SCM h, t; | |
166 | ||
167 | h = SCM_SIMPLE_VECTOR_REF (signal_handler_asyncs, sig); | |
168 | t = SCM_SIMPLE_VECTOR_REF (signal_handler_threads, sig); | |
169 | if (scm_is_true (h)) | |
170 | scm_system_async_mark_for_thread (h, t); | |
171 | } | |
172 | else if (n < 0 && errno != EINTR) | |
173 | perror ("error in signal delivery thread"); | |
174 | } | |
229a0710 NJ |
175 | |
176 | return SCM_UNSPECIFIED; /* not reached */ | |
2fbc8609 | 177 | } |
e1a191a8 | 178 | |
9de87eea MV |
179 | static void |
180 | start_signal_delivery_thread (void) | |
2fbc8609 | 181 | { |
9de87eea MV |
182 | if (pipe (signal_pipe) != 0) |
183 | scm_syserror (NULL); | |
184 | scm_spawn_thread (signal_delivery_thread, NULL, | |
185 | scm_handle_by_message, "signal delivery thread"); | |
0f2d19dd JB |
186 | } |
187 | ||
9de87eea MV |
188 | static void |
189 | ensure_signal_delivery_thread () | |
190 | { | |
191 | static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT; | |
192 | scm_i_pthread_once (&once, start_signal_delivery_thread); | |
193 | } | |
dbbaa07c | 194 | |
9de87eea | 195 | #else /* !SCM_USE_PTHREAD_THREADS */ |
dbbaa07c | 196 | |
9de87eea MV |
197 | static SIGRETTYPE |
198 | take_signal (int signum) | |
dbbaa07c | 199 | { |
9de87eea MV |
200 | SCM cell = SCM_SIMPLE_VECTOR_REF (signal_handler_asyncs, signum); |
201 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
202 | ||
203 | if (scm_is_false (SCM_CDR (cell))) | |
dbbaa07c | 204 | { |
9de87eea MV |
205 | SCM_SETCDR (cell, t->active_asyncs); |
206 | t->active_asyncs = cell; | |
207 | t->pending_asyncs = 1; | |
dbbaa07c | 208 | } |
9de87eea MV |
209 | |
210 | #ifndef HAVE_SIGACTION | |
211 | signal (signum, take_signal); | |
212 | #endif | |
dbbaa07c MV |
213 | } |
214 | ||
9de87eea MV |
215 | static void |
216 | ensure_signal_delivery_thread () | |
dbbaa07c | 217 | { |
9de87eea MV |
218 | return; |
219 | } | |
dbbaa07c | 220 | |
9de87eea | 221 | #endif /* !SCM_USE_PTHREAD_THREADS */ |
dbbaa07c | 222 | |
9de87eea MV |
223 | static void |
224 | install_handler (int signum, SCM thread, SCM handler) | |
225 | { | |
7888309b | 226 | if (scm_is_false (handler)) |
dbbaa07c | 227 | { |
4057a3e0 | 228 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, signum, SCM_BOOL_F); |
9de87eea | 229 | SCM_SIMPLE_VECTOR_SET (signal_handler_asyncs, signum, SCM_BOOL_F); |
dbbaa07c MV |
230 | } |
231 | else | |
232 | { | |
9de87eea MV |
233 | SCM async = close_1 (handler, scm_from_int (signum)); |
234 | #if !SCM_USE_PTHREAD_THREADS | |
235 | async = scm_cons (async, SCM_BOOL_F); | |
236 | #endif | |
4057a3e0 | 237 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, signum, handler); |
9de87eea | 238 | SCM_SIMPLE_VECTOR_SET (signal_handler_asyncs, signum, async); |
dbbaa07c MV |
239 | } |
240 | ||
9de87eea | 241 | SCM_SIMPLE_VECTOR_SET (signal_handler_threads, signum, thread); |
dbbaa07c MV |
242 | } |
243 | ||
9de87eea MV |
244 | SCM |
245 | scm_sigaction (SCM signum, SCM handler, SCM flags) | |
dbbaa07c | 246 | { |
9de87eea | 247 | return scm_sigaction_for_thread (signum, handler, flags, SCM_UNDEFINED); |
dbbaa07c MV |
248 | } |
249 | ||
e1a191a8 | 250 | /* user interface for installation of signal handlers. */ |
2fbc8609 MV |
251 | SCM_DEFINE (scm_sigaction_for_thread, "sigaction", 1, 3, 0, |
252 | (SCM signum, SCM handler, SCM flags, SCM thread), | |
0d172d3f | 253 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
254 | "@var{signum} is the signal number, which can be specified using the value\n" |
255 | "of variables such as @code{SIGINT}.\n\n" | |
2fbc8609 | 256 | "If @var{handler} is omitted, @code{sigaction} returns a pair: the\n" |
b380b885 MD |
257 | "CAR is the current\n" |
258 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
259 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
260 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
261 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
2fbc8609 MV |
262 | "If @var{handler} is provided, it is installed as the new handler for\n" |
263 | "@var{signum}. @var{handler} can be a Scheme procedure taking one\n" | |
b380b885 MD |
264 | "argument, or the value of @code{SIG_DFL} (default action) or\n" |
265 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
2fbc8609 MV |
266 | "was installed before @code{sigaction} was first used. When\n" |
267 | "a scheme procedure has been specified, that procedure will run\n" | |
268 | "in the given @var{thread}. When no thread has been given, the\n" | |
269 | "thread that made this call to @code{sigaction} is used.\n" | |
270 | "Flags can " | |
b380b885 | 271 | "optionally be specified for the new handler (@code{SA_RESTART} will\n" |
0d172d3f | 272 | "always be added if it's available and the system is using restartable\n" |
b380b885 MD |
273 | "system calls.) The return value is a pair with information about the\n" |
274 | "old handler as described above.\n\n" | |
275 | "This interface does not provide access to the \"signal blocking\"\n" | |
276 | "facility. Maybe this is not needed, since the thread support may\n" | |
277 | "provide solutions to the problem of consistent access to data\n" | |
278 | "structures.") | |
2fbc8609 | 279 | #define FUNC_NAME s_scm_sigaction_for_thread |
e1a191a8 GH |
280 | { |
281 | int csig; | |
282 | #ifdef HAVE_SIGACTION | |
283 | struct sigaction action; | |
284 | struct sigaction old_action; | |
285 | #else | |
af68e5e5 | 286 | SIGRETTYPE (* chandler) (int) = SIG_DFL; |
e1a191a8 GH |
287 | SIGRETTYPE (* old_chandler) (int); |
288 | #endif | |
289 | int query_only = 0; | |
290 | int save_handler = 0; | |
34d19ef6 | 291 | |
e1a191a8 GH |
292 | SCM old_handler; |
293 | ||
a55c2b68 MV |
294 | csig = scm_to_signed_integer (signum, 0, NSIG-1); |
295 | ||
7ee92fce GH |
296 | #if defined(HAVE_SIGACTION) |
297 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
298 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
299 | is defined, since libguile would be likely to produce spurious | |
300 | EINTR errors. */ | |
e1a191a8 GH |
301 | action.sa_flags = SA_RESTART; |
302 | #else | |
303 | action.sa_flags = 0; | |
304 | #endif | |
305 | if (!SCM_UNBNDP (flags)) | |
a55c2b68 | 306 | action.sa_flags |= scm_to_int (flags); |
e1a191a8 | 307 | sigemptyset (&action.sa_mask); |
4feac0b9 MV |
308 | #endif |
309 | ||
2fbc8609 MV |
310 | if (SCM_UNBNDP (thread)) |
311 | thread = scm_current_thread (); | |
312 | else | |
dbbaa07c MV |
313 | { |
314 | SCM_VALIDATE_THREAD (4, thread); | |
315 | if (scm_c_thread_exited_p (thread)) | |
316 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
317 | } | |
4feac0b9 | 318 | |
9de87eea MV |
319 | ensure_signal_delivery_thread (); |
320 | ||
321 | SCM_CRITICAL_SECTION_START; | |
4057a3e0 | 322 | old_handler = SCM_SIMPLE_VECTOR_REF (*signal_handlers, csig); |
e1a191a8 GH |
323 | if (SCM_UNBNDP (handler)) |
324 | query_only = 1; | |
e11e83f3 | 325 | else if (scm_is_integer (handler)) |
e1a191a8 | 326 | { |
9de87eea MV |
327 | long handler_int = scm_to_long (handler); |
328 | ||
329 | if (handler_int == (long) SIG_DFL || handler_int == (long) SIG_IGN) | |
e1a191a8 GH |
330 | { |
331 | #ifdef HAVE_SIGACTION | |
9de87eea | 332 | action.sa_handler = (SIGRETTYPE (*) (int)) handler_int; |
e1a191a8 | 333 | #else |
9de87eea | 334 | chandler = (SIGRETTYPE (*) (int)) handler_int; |
e1a191a8 | 335 | #endif |
dbbaa07c | 336 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
337 | } |
338 | else | |
1bbd0b84 | 339 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 | 340 | } |
7888309b | 341 | else if (scm_is_false (handler)) |
e1a191a8 GH |
342 | { |
343 | /* restore the default handler. */ | |
344 | #ifdef HAVE_SIGACTION | |
345 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
346 | query_only = 1; | |
347 | else | |
348 | { | |
349 | action = orig_handlers[csig]; | |
350 | orig_handlers[csig].sa_handler = SIG_ERR; | |
dbbaa07c | 351 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
352 | } |
353 | #else | |
354 | if (orig_handlers[csig] == SIG_ERR) | |
355 | query_only = 1; | |
356 | else | |
357 | { | |
358 | chandler = orig_handlers[csig]; | |
359 | orig_handlers[csig] = SIG_ERR; | |
dbbaa07c | 360 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
361 | } |
362 | #endif | |
adb2c53b | 363 | } |
e1a191a8 GH |
364 | else |
365 | { | |
43067cec | 366 | SCM_VALIDATE_PROC (2, handler); |
e1a191a8 GH |
367 | #ifdef HAVE_SIGACTION |
368 | action.sa_handler = take_signal; | |
369 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
370 | save_handler = 1; | |
371 | #else | |
372 | chandler = take_signal; | |
373 | if (orig_handlers[csig] == SIG_ERR) | |
374 | save_handler = 1; | |
375 | #endif | |
dbbaa07c | 376 | install_handler (csig, thread, handler); |
e1a191a8 | 377 | } |
adb2c53b | 378 | |
0d172d3f MV |
379 | /* XXX - Silently ignore setting handlers for `program error signals' |
380 | because they can't currently be handled by Scheme code. | |
381 | */ | |
382 | ||
383 | switch (csig) | |
384 | { | |
385 | /* This list of program error signals is from the GNU Libc | |
386 | Reference Manual */ | |
387 | case SIGFPE: | |
388 | case SIGILL: | |
389 | case SIGSEGV: | |
82893676 | 390 | #ifdef SIGBUS |
0d172d3f | 391 | case SIGBUS: |
82893676 | 392 | #endif |
0d172d3f | 393 | case SIGABRT: |
6732de1b | 394 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
395 | case SIGIOT: |
396 | #endif | |
82893676 | 397 | #ifdef SIGTRAP |
0d172d3f | 398 | case SIGTRAP: |
82893676 | 399 | #endif |
0d172d3f MV |
400 | #ifdef SIGEMT |
401 | case SIGEMT: | |
402 | #endif | |
adb2c53b | 403 | #ifdef SIGSYS |
0d172d3f | 404 | case SIGSYS: |
adb2c53b | 405 | #endif |
0d172d3f MV |
406 | query_only = 1; |
407 | } | |
408 | ||
e1a191a8 GH |
409 | #ifdef HAVE_SIGACTION |
410 | if (query_only) | |
411 | { | |
412 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 413 | SCM_SYSERROR; |
e1a191a8 GH |
414 | } |
415 | else | |
416 | { | |
417 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 418 | SCM_SYSERROR; |
e1a191a8 GH |
419 | if (save_handler) |
420 | orig_handlers[csig] = old_action; | |
421 | } | |
422 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
b9bd8526 | 423 | old_handler = scm_from_long ((long) old_action.sa_handler); |
9de87eea | 424 | SCM_CRITICAL_SECTION_END; |
e11e83f3 | 425 | return scm_cons (old_handler, scm_from_int (old_action.sa_flags)); |
e1a191a8 GH |
426 | #else |
427 | if (query_only) | |
428 | { | |
429 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 430 | SCM_SYSERROR; |
e1a191a8 | 431 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 432 | SCM_SYSERROR; |
e1a191a8 GH |
433 | } |
434 | else | |
435 | { | |
436 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 437 | SCM_SYSERROR; |
e1a191a8 GH |
438 | if (save_handler) |
439 | orig_handlers[csig] = old_chandler; | |
440 | } | |
441 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
b9bd8526 | 442 | old_handler = scm_from_long ((long) old_chandler); |
9de87eea | 443 | SCM_CRITICAL_SECTION_END; |
e11e83f3 | 444 | return scm_cons (old_handler, scm_from_int (0)); |
0f2d19dd | 445 | #endif |
e1a191a8 | 446 | } |
1bbd0b84 | 447 | #undef FUNC_NAME |
e1a191a8 | 448 | |
adb2c53b | 449 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 450 | (void), |
b380b885 MD |
451 | "Return all signal handlers to the values they had before any call to\n" |
452 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 453 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
454 | { |
455 | int i; | |
e1a191a8 GH |
456 | for (i = 0; i < NSIG; i++) |
457 | { | |
458 | #ifdef HAVE_SIGACTION | |
459 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
460 | { | |
461 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 462 | SCM_SYSERROR; |
e1a191a8 | 463 | orig_handlers[i].sa_handler = SIG_ERR; |
4057a3e0 | 464 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
465 | } |
466 | #else | |
467 | if (orig_handlers[i] != SIG_ERR) | |
468 | { | |
469 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 470 | SCM_SYSERROR; |
e1a191a8 | 471 | orig_handlers[i] = SIG_ERR; |
4057a3e0 | 472 | SCM_SIMPLE_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
473 | } |
474 | #endif | |
475 | } | |
476 | return SCM_UNSPECIFIED; | |
477 | } | |
1bbd0b84 | 478 | #undef FUNC_NAME |
0f2d19dd | 479 | |
adb2c53b | 480 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 481 | (SCM i), |
b380b885 MD |
482 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
483 | "number of seconds (an integer). It's advisable to install a signal\n" | |
484 | "handler for\n" | |
485 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
486 | "the process.\n\n" | |
487 | "The return value indicates the time remaining for the previous alarm,\n" | |
488 | "if any. The new value replaces the previous alarm. If there was\n" | |
489 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 490 | #define FUNC_NAME s_scm_alarm |
0f2d19dd | 491 | { |
a55c2b68 | 492 | return scm_from_uint (alarm (scm_to_uint (i))); |
0f2d19dd | 493 | } |
1bbd0b84 | 494 | #undef FUNC_NAME |
0f2d19dd | 495 | |
53f8a0d2 RB |
496 | #ifdef HAVE_SETITIMER |
497 | SCM_DEFINE (scm_setitimer, "setitimer", 5, 0, 0, | |
498 | (SCM which_timer, | |
499 | SCM interval_seconds, SCM interval_microseconds, | |
500 | SCM value_seconds, SCM value_microseconds), | |
501 | "Set the timer specified by @var{which_timer} according to the given\n" | |
502 | "@var{interval_seconds}, @var{interval_microseconds},\n" | |
503 | "@var{value_seconds}, and @var{value_microseconds} values.\n" | |
504 | "\n" | |
505 | "Return information about the timer's previous setting." | |
506 | "\n" | |
507 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
508 | "Interface Conventions''.\n" | |
509 | "\n" | |
9401323e | 510 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
511 | "and @code{ITIMER_PROF}.\n" |
512 | "\n" | |
513 | "The return value will be a list of two cons pairs representing the\n" | |
514 | "current state of the given timer. The first pair is the seconds and\n" | |
515 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 516 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
517 | #define FUNC_NAME s_scm_setitimer |
518 | { | |
519 | int rv; | |
520 | int c_which_timer; | |
521 | struct itimerval new_timer; | |
522 | struct itimerval old_timer; | |
523 | ||
524 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
525 | new_timer.it_interval.tv_sec = SCM_NUM2LONG(2, interval_seconds); | |
526 | new_timer.it_interval.tv_usec = SCM_NUM2LONG(3, interval_microseconds); | |
527 | new_timer.it_value.tv_sec = SCM_NUM2LONG(4, value_seconds); | |
528 | new_timer.it_value.tv_usec = SCM_NUM2LONG(5, value_microseconds); | |
529 | ||
530 | SCM_SYSCALL(rv = setitimer(c_which_timer, &new_timer, &old_timer)); | |
531 | ||
532 | if(rv != 0) | |
533 | SCM_SYSERROR; | |
534 | ||
b9bd8526 MV |
535 | return scm_list_2 (scm_cons (scm_from_long (old_timer.it_interval.tv_sec), |
536 | scm_from_long (old_timer.it_interval.tv_usec)), | |
537 | scm_cons (scm_from_long (old_timer.it_value.tv_sec), | |
538 | scm_from_long (old_timer.it_value.tv_usec))); | |
53f8a0d2 RB |
539 | } |
540 | #undef FUNC_NAME | |
541 | #endif /* HAVE_SETITIMER */ | |
542 | ||
543 | #ifdef HAVE_GETITIMER | |
544 | SCM_DEFINE (scm_getitimer, "getitimer", 1, 0, 0, | |
545 | (SCM which_timer), | |
546 | "Return information about the timer specified by @var{which_timer}" | |
547 | "\n" | |
548 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
549 | "Interface Conventions''.\n" | |
550 | "\n" | |
9401323e | 551 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
552 | "and @code{ITIMER_PROF}.\n" |
553 | "\n" | |
554 | "The return value will be a list of two cons pairs representing the\n" | |
555 | "current state of the given timer. The first pair is the seconds and\n" | |
556 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 557 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
558 | #define FUNC_NAME s_scm_getitimer |
559 | { | |
560 | int rv; | |
561 | int c_which_timer; | |
562 | struct itimerval old_timer; | |
563 | ||
564 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
565 | ||
566 | SCM_SYSCALL(rv = getitimer(c_which_timer, &old_timer)); | |
567 | ||
568 | if(rv != 0) | |
569 | SCM_SYSERROR; | |
570 | ||
b9bd8526 MV |
571 | return scm_list_2 (scm_cons (scm_from_long (old_timer.it_interval.tv_sec), |
572 | scm_from_long (old_timer.it_interval.tv_usec)), | |
573 | scm_cons (scm_from_long (old_timer.it_value.tv_sec), | |
574 | scm_from_long (old_timer.it_value.tv_usec))); | |
53f8a0d2 RB |
575 | } |
576 | #undef FUNC_NAME | |
577 | #endif /* HAVE_GETITIMER */ | |
578 | ||
0e958795 | 579 | #ifdef HAVE_PAUSE |
adb2c53b | 580 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 581 | (), |
b380b885 MD |
582 | "Pause the current process (thread?) until a signal arrives whose\n" |
583 | "action is to either terminate the current process or invoke a\n" | |
584 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 585 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
586 | { |
587 | pause (); | |
588 | return SCM_UNSPECIFIED; | |
589 | } | |
1bbd0b84 | 590 | #undef FUNC_NAME |
0e958795 | 591 | #endif |
0f2d19dd | 592 | |
adb2c53b | 593 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 594 | (SCM i), |
b380b885 MD |
595 | "Wait for the given number of seconds (an integer) or until a signal\n" |
596 | "arrives. The return value is zero if the time elapses or the number\n" | |
597 | "of seconds remaining otherwise.") | |
1bbd0b84 | 598 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 599 | { |
9de87eea | 600 | return scm_from_uint (scm_std_sleep (scm_to_uint (i))); |
0f2d19dd | 601 | } |
1bbd0b84 | 602 | #undef FUNC_NAME |
0f2d19dd | 603 | |
adb2c53b | 604 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 605 | (SCM i), |
a55c2b68 | 606 | "Sleep for @var{i} microseconds.") |
1bbd0b84 | 607 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 608 | { |
9de87eea | 609 | return scm_from_ulong (scm_std_usleep (scm_to_ulong (i))); |
b74f4728 | 610 | } |
1bbd0b84 | 611 | #undef FUNC_NAME |
ce874f2d | 612 | |
adb2c53b | 613 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 614 | (SCM sig), |
b380b885 MD |
615 | "Sends a specified signal @var{sig} to the current process, where\n" |
616 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 617 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 618 | { |
a55c2b68 | 619 | if (kill (getpid (), scm_to_int (sig)) != 0) |
1bbd0b84 | 620 | SCM_SYSERROR; |
e1a191a8 | 621 | return SCM_UNSPECIFIED; |
0f2d19dd | 622 | } |
1bbd0b84 | 623 | #undef FUNC_NAME |
0f2d19dd JB |
624 | |
625 | \f | |
0f2d19dd | 626 | |
e1a191a8 GH |
627 | void |
628 | scm_init_scmsigs () | |
0f2d19dd | 629 | { |
e1a191a8 GH |
630 | int i; |
631 | ||
632 | signal_handlers = | |
86d31dfe MV |
633 | SCM_VARIABLE_LOC (scm_c_define ("signal-handlers", |
634 | scm_c_make_vector (NSIG, SCM_BOOL_F))); | |
9de87eea | 635 | signal_handler_asyncs = |
dbbaa07c | 636 | scm_permanent_object (scm_c_make_vector (NSIG, SCM_BOOL_F)); |
2fbc8609 MV |
637 | signal_handler_threads = |
638 | scm_permanent_object (scm_c_make_vector (NSIG, SCM_BOOL_F)); | |
e1a191a8 GH |
639 | |
640 | for (i = 0; i < NSIG; i++) | |
641 | { | |
e1a191a8 GH |
642 | #ifdef HAVE_SIGACTION |
643 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 644 | |
e1a191a8 GH |
645 | #else |
646 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 647 | #endif |
840ae05d | 648 | |
08b8c694 | 649 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce | 650 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
adb2c53b | 651 | signals really are restartable. don't rely on the same |
7ee92fce GH |
652 | run-time that configure got: reset the default for every signal. |
653 | */ | |
654 | #ifdef HAVE_SIGINTERRUPT | |
655 | siginterrupt (i, 0); | |
de881428 | 656 | #elif defined(SA_RESTART) |
840ae05d JB |
657 | { |
658 | struct sigaction action; | |
659 | ||
660 | sigaction (i, NULL, &action); | |
661 | if (!(action.sa_flags & SA_RESTART)) | |
662 | { | |
3efb80f2 | 663 | action.sa_flags |= SA_RESTART; |
840ae05d JB |
664 | sigaction (i, &action, NULL); |
665 | } | |
666 | } | |
7ee92fce GH |
667 | #endif |
668 | /* if neither siginterrupt nor SA_RESTART are available we may | |
669 | as well assume that signals are always restartable. */ | |
840ae05d | 670 | #endif |
e1a191a8 | 671 | } |
1cc91f1b | 672 | |
b9bd8526 MV |
673 | scm_c_define ("NSIG", scm_from_long (NSIG)); |
674 | scm_c_define ("SIG_IGN", scm_from_long ((long) SIG_IGN)); | |
675 | scm_c_define ("SIG_DFL", scm_from_long ((long) SIG_DFL)); | |
e1a191a8 | 676 | #ifdef SA_NOCLDSTOP |
b9bd8526 | 677 | scm_c_define ("SA_NOCLDSTOP", scm_from_long (SA_NOCLDSTOP)); |
0f2d19dd | 678 | #endif |
e1a191a8 | 679 | #ifdef SA_RESTART |
b9bd8526 | 680 | scm_c_define ("SA_RESTART", scm_from_long (SA_RESTART)); |
0f2d19dd | 681 | #endif |
1cc91f1b | 682 | |
53f8a0d2 RB |
683 | #if defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) |
684 | /* Stuff needed by setitimer and getitimer. */ | |
e11e83f3 MV |
685 | scm_c_define ("ITIMER_REAL", scm_from_int (ITIMER_REAL)); |
686 | scm_c_define ("ITIMER_VIRTUAL", scm_from_int (ITIMER_VIRTUAL)); | |
687 | scm_c_define ("ITIMER_PROF", scm_from_int (ITIMER_PROF)); | |
53f8a0d2 RB |
688 | #endif /* defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) */ |
689 | ||
a0599745 | 690 | #include "libguile/scmsigs.x" |
0f2d19dd JB |
691 | } |
692 | ||
89e00824 ML |
693 | |
694 | /* | |
695 | Local Variables: | |
696 | c-file-style: "gnu" | |
697 | End: | |
698 | */ |