Commit | Line | Data |
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e4b265d8 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. |
adb2c53b | 2 | * |
0f2d19dd JB |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
adb2c53b | 7 | * |
0f2d19dd JB |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
adb2c53b | 12 | * |
0f2d19dd JB |
13 | * You should have received a copy of the GNU General Public License |
14 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 | 41 | |
1bbd0b84 | 42 | |
0f2d19dd JB |
43 | \f |
44 | ||
0f2d19dd | 45 | #include <signal.h> |
e6e2e95a MD |
46 | #include <errno.h> |
47 | ||
a0599745 | 48 | #include "libguile/_scm.h" |
0f2d19dd | 49 | |
a0599745 MD |
50 | #include "libguile/async.h" |
51 | #include "libguile/eval.h" | |
fdc28395 | 52 | #include "libguile/root.h" |
a0599745 | 53 | #include "libguile/vectors.h" |
1bbd0b84 | 54 | |
a0599745 MD |
55 | #include "libguile/validate.h" |
56 | #include "libguile/scmsigs.h" | |
20e6290e | 57 | |
0f2d19dd JB |
58 | #ifdef HAVE_UNISTD_H |
59 | #include <unistd.h> | |
60 | #endif | |
61 | ||
1bed8c28 GH |
62 | #ifdef HAVE_SYS_TIME_H |
63 | #include <sys/time.h> | |
64 | #endif | |
65 | ||
b74f4728 JB |
66 | /* The thread system has its own sleep and usleep functions. */ |
67 | #ifndef USE_THREADS | |
68 | ||
69 | #if defined(MISSING_SLEEP_DECL) | |
70 | int sleep (); | |
71 | #endif | |
72 | ||
73 | #if defined(HAVE_USLEEP) && defined(MISSING_USLEEP_DECL) | |
74 | int usleep (); | |
ce874f2d | 75 | #endif |
b74f4728 | 76 | |
0935d604 | 77 | #endif |
0f2d19dd | 78 | |
82893676 MG |
79 | #ifdef __MINGW32__ |
80 | #include <windows.h> | |
81 | #define alarm(sec) (0) | |
82 | /* This weird comma expression is because Sleep is void under Windows. */ | |
83 | #define sleep(sec) (Sleep ((sec) * 1000), 0) | |
ed618cc9 | 84 | #define usleep(usec) (Sleep ((usec) / 1000), 0) |
82893676 MG |
85 | #define kill(pid, sig) raise (sig) |
86 | #endif | |
87 | ||
0f2d19dd JB |
88 | \f |
89 | ||
e1a191a8 | 90 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
91 | |
92 | #ifdef RETSIGTYPE | |
e1a191a8 | 93 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 94 | #else |
e1a191a8 GH |
95 | # ifdef STDC_HEADERS |
96 | # define SIGRETTYPE void | |
97 | # else | |
98 | # define SIGRETTYPE int | |
99 | # endif | |
0f2d19dd JB |
100 | #endif |
101 | ||
102 | \f | |
103 | ||
e1a191a8 GH |
104 | /* take_signal is installed as the C signal handler whenever a Scheme |
105 | handler is set. when a signal arrives, take_signal marks the corresponding | |
106 | element of got_signal and marks signal_async. the thunk in signal_async | |
107 | (sys_deliver_signals) will be run at the next opportunity, outside a | |
108 | critical section. sys_deliver_signals runs each Scheme handler for | |
109 | which got_signal is set. */ | |
0f2d19dd | 110 | |
e1a191a8 | 111 | static SCM signal_async; |
0f2d19dd | 112 | |
e1a191a8 | 113 | static char got_signal[NSIG]; |
0f2d19dd | 114 | |
e1a191a8 GH |
115 | /* a Scheme vector of handler procedures. */ |
116 | static SCM *signal_handlers; | |
0f2d19dd | 117 | |
e1a191a8 GH |
118 | /* saves the original C handlers, when a new handler is installed. |
119 | set to SIG_ERR if the original handler is installed. */ | |
120 | #ifdef HAVE_SIGACTION | |
121 | static struct sigaction orig_handlers[NSIG]; | |
122 | #else | |
da6e81b6 | 123 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
124 | #endif |
125 | ||
e1a191a8 GH |
126 | static SIGRETTYPE |
127 | take_signal (int signum) | |
128 | { | |
ee149d03 | 129 | int saved_errno = errno; |
e1a191a8 | 130 | SCM ignored; |
0f781bf6 | 131 | |
e1a191a8 GH |
132 | if (!scm_ints_disabled) |
133 | { | |
134 | /* For reasons of speed, the SCM_NEWCELL macro doesn't defer | |
135 | interrupts. Instead, it first sets its argument to point to | |
136 | the first cell in the list, and then advances the freelist | |
137 | pointer to the next cell. Now, if this procedure is | |
138 | interrupted, the only anomalous state possible is to have | |
139 | both SCM_NEWCELL's argument and scm_freelist pointing to the | |
140 | same cell. To deal with this case, we always throw away the | |
141 | first cell in scm_freelist here. | |
142 | ||
143 | At least, that's the theory. I'm not convinced that that's | |
144 | the only anomalous path we need to worry about. */ | |
145 | SCM_NEWCELL (ignored); | |
146 | } | |
147 | got_signal[signum] = 1; | |
148 | #if HAVE_SIGACTION | |
149 | /* unblock the signal before the scheme handler gets to run, since | |
150 | it may use longjmp to escape (i.e., throw an exception). */ | |
151 | { | |
152 | sigset_t set; | |
153 | sigemptyset (&set); | |
154 | sigaddset (&set, signum); | |
155 | sigprocmask (SIG_UNBLOCK, &set, NULL); | |
156 | } | |
157 | #endif | |
158 | scm_system_async_mark (signal_async); | |
ee149d03 | 159 | errno = saved_errno; |
e1a191a8 | 160 | } |
0f2d19dd | 161 | |
e1a191a8 GH |
162 | static SCM |
163 | sys_deliver_signals (void) | |
164 | { | |
165 | int i; | |
166 | ||
167 | for (i = 0; i < NSIG; i++) | |
168 | { | |
169 | if (got_signal[i]) | |
170 | { | |
cc0b3312 GH |
171 | /* The flag is reset before calling the handler in case the |
172 | handler doesn't return. If the handler doesn't return | |
173 | but leaves other signals flagged, they their handlers | |
174 | will be applied some time later when the async is checked | |
175 | again. It would probably be better to reset the flags | |
176 | after doing a longjmp. */ | |
e1a191a8 GH |
177 | got_signal[i] = 0; |
178 | #ifndef HAVE_SIGACTION | |
179 | signal (i, take_signal); | |
180 | #endif | |
fdc28395 | 181 | scm_call_1 (SCM_VELTS (*signal_handlers)[i], SCM_MAKINUM (i)); |
e1a191a8 GH |
182 | } |
183 | } | |
184 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
185 | } |
186 | ||
e1a191a8 | 187 | /* user interface for installation of signal handlers. */ |
adb2c53b | 188 | SCM_DEFINE (scm_sigaction, "sigaction", 1, 2, 0, |
1bbd0b84 | 189 | (SCM signum, SCM handler, SCM flags), |
0d172d3f | 190 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
191 | "@var{signum} is the signal number, which can be specified using the value\n" |
192 | "of variables such as @code{SIGINT}.\n\n" | |
193 | "If @var{action} is omitted, @code{sigaction} returns a pair: the\n" | |
194 | "CAR is the current\n" | |
195 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
196 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
197 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
198 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
199 | "If @var{action} is provided, it is installed as the new handler for\n" | |
200 | "@var{signum}. @var{action} can be a Scheme procedure taking one\n" | |
201 | "argument, or the value of @code{SIG_DFL} (default action) or\n" | |
202 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
203 | "was installed before @code{sigaction} was first used. Flags can\n" | |
204 | "optionally be specified for the new handler (@code{SA_RESTART} will\n" | |
0d172d3f | 205 | "always be added if it's available and the system is using restartable\n" |
b380b885 MD |
206 | "system calls.) The return value is a pair with information about the\n" |
207 | "old handler as described above.\n\n" | |
208 | "This interface does not provide access to the \"signal blocking\"\n" | |
209 | "facility. Maybe this is not needed, since the thread support may\n" | |
210 | "provide solutions to the problem of consistent access to data\n" | |
211 | "structures.") | |
1bbd0b84 | 212 | #define FUNC_NAME s_scm_sigaction |
e1a191a8 GH |
213 | { |
214 | int csig; | |
215 | #ifdef HAVE_SIGACTION | |
216 | struct sigaction action; | |
217 | struct sigaction old_action; | |
218 | #else | |
219 | SIGRETTYPE (* chandler) (int); | |
220 | SIGRETTYPE (* old_chandler) (int); | |
221 | #endif | |
222 | int query_only = 0; | |
223 | int save_handler = 0; | |
224 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); | |
225 | SCM old_handler; | |
226 | ||
3b3b36dd | 227 | SCM_VALIDATE_INUM_COPY (1,signum,csig); |
7ee92fce GH |
228 | #if defined(HAVE_SIGACTION) |
229 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
230 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
231 | is defined, since libguile would be likely to produce spurious | |
232 | EINTR errors. */ | |
e1a191a8 GH |
233 | action.sa_flags = SA_RESTART; |
234 | #else | |
235 | action.sa_flags = 0; | |
236 | #endif | |
237 | if (!SCM_UNBNDP (flags)) | |
238 | { | |
3b3b36dd | 239 | SCM_VALIDATE_INUM (3,flags); |
e1a191a8 GH |
240 | action.sa_flags |= SCM_INUM (flags); |
241 | } | |
242 | sigemptyset (&action.sa_mask); | |
243 | #endif | |
244 | SCM_DEFER_INTS; | |
245 | old_handler = scheme_handlers[csig]; | |
246 | if (SCM_UNBNDP (handler)) | |
247 | query_only = 1; | |
9a09deb1 | 248 | else if (SCM_EQ_P (scm_integer_p (handler), SCM_BOOL_T)) |
e1a191a8 | 249 | { |
e4b265d8 DH |
250 | if (SCM_NUM2LONG (2, handler) == (long) SIG_DFL |
251 | || SCM_NUM2LONG (2, handler) == (long) SIG_IGN) | |
e1a191a8 GH |
252 | { |
253 | #ifdef HAVE_SIGACTION | |
254 | action.sa_handler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
255 | #else | |
256 | chandler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
257 | #endif | |
258 | scheme_handlers[csig] = SCM_BOOL_F; | |
259 | } | |
260 | else | |
1bbd0b84 | 261 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 GH |
262 | } |
263 | else if (SCM_FALSEP (handler)) | |
264 | { | |
265 | /* restore the default handler. */ | |
266 | #ifdef HAVE_SIGACTION | |
267 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
268 | query_only = 1; | |
269 | else | |
270 | { | |
271 | action = orig_handlers[csig]; | |
272 | orig_handlers[csig].sa_handler = SIG_ERR; | |
273 | scheme_handlers[csig] = SCM_BOOL_F; | |
274 | } | |
275 | #else | |
276 | if (orig_handlers[csig] == SIG_ERR) | |
277 | query_only = 1; | |
278 | else | |
279 | { | |
280 | chandler = orig_handlers[csig]; | |
281 | orig_handlers[csig] = SIG_ERR; | |
282 | scheme_handlers[csig] = SCM_BOOL_F; | |
283 | } | |
284 | #endif | |
adb2c53b | 285 | } |
e1a191a8 GH |
286 | else |
287 | { | |
6b5a304f | 288 | SCM_VALIDATE_NIM (2,handler); |
e1a191a8 GH |
289 | #ifdef HAVE_SIGACTION |
290 | action.sa_handler = take_signal; | |
291 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
292 | save_handler = 1; | |
293 | #else | |
294 | chandler = take_signal; | |
295 | if (orig_handlers[csig] == SIG_ERR) | |
296 | save_handler = 1; | |
297 | #endif | |
298 | scheme_handlers[csig] = handler; | |
299 | } | |
adb2c53b | 300 | |
0d172d3f MV |
301 | /* XXX - Silently ignore setting handlers for `program error signals' |
302 | because they can't currently be handled by Scheme code. | |
303 | */ | |
304 | ||
305 | switch (csig) | |
306 | { | |
307 | /* This list of program error signals is from the GNU Libc | |
308 | Reference Manual */ | |
309 | case SIGFPE: | |
310 | case SIGILL: | |
311 | case SIGSEGV: | |
82893676 | 312 | #ifdef SIGBUS |
0d172d3f | 313 | case SIGBUS: |
82893676 | 314 | #endif |
0d172d3f | 315 | case SIGABRT: |
6732de1b | 316 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
317 | case SIGIOT: |
318 | #endif | |
82893676 | 319 | #ifdef SIGTRAP |
0d172d3f | 320 | case SIGTRAP: |
82893676 | 321 | #endif |
0d172d3f MV |
322 | #ifdef SIGEMT |
323 | case SIGEMT: | |
324 | #endif | |
adb2c53b | 325 | #ifdef SIGSYS |
0d172d3f | 326 | case SIGSYS: |
adb2c53b | 327 | #endif |
0d172d3f MV |
328 | query_only = 1; |
329 | } | |
330 | ||
e1a191a8 GH |
331 | #ifdef HAVE_SIGACTION |
332 | if (query_only) | |
333 | { | |
334 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 335 | SCM_SYSERROR; |
e1a191a8 GH |
336 | } |
337 | else | |
338 | { | |
339 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 340 | SCM_SYSERROR; |
e1a191a8 GH |
341 | if (save_handler) |
342 | orig_handlers[csig] = old_action; | |
343 | } | |
344 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 345 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 GH |
346 | SCM_ALLOW_INTS; |
347 | return scm_cons (old_handler, SCM_MAKINUM (old_action.sa_flags)); | |
348 | #else | |
349 | if (query_only) | |
350 | { | |
351 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 352 | SCM_SYSERROR; |
e1a191a8 | 353 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 354 | SCM_SYSERROR; |
e1a191a8 GH |
355 | } |
356 | else | |
357 | { | |
358 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 359 | SCM_SYSERROR; |
e1a191a8 GH |
360 | if (save_handler) |
361 | orig_handlers[csig] = old_chandler; | |
362 | } | |
363 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
da6e81b6 | 364 | old_handler = scm_long2num ((long) old_chandler); |
e1a191a8 GH |
365 | SCM_ALLOW_INTS; |
366 | return scm_cons (old_handler, SCM_MAKINUM (0)); | |
0f2d19dd | 367 | #endif |
e1a191a8 | 368 | } |
1bbd0b84 | 369 | #undef FUNC_NAME |
e1a191a8 | 370 | |
adb2c53b | 371 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 372 | (void), |
b380b885 MD |
373 | "Return all signal handlers to the values they had before any call to\n" |
374 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 375 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
376 | { |
377 | int i; | |
adb2c53b | 378 | SCM *scheme_handlers = SCM_VELTS (*signal_handlers); |
e1a191a8 GH |
379 | |
380 | for (i = 0; i < NSIG; i++) | |
381 | { | |
382 | #ifdef HAVE_SIGACTION | |
383 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
384 | { | |
385 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 386 | SCM_SYSERROR; |
e1a191a8 GH |
387 | orig_handlers[i].sa_handler = SIG_ERR; |
388 | scheme_handlers[i] = SCM_BOOL_F; | |
389 | } | |
390 | #else | |
391 | if (orig_handlers[i] != SIG_ERR) | |
392 | { | |
393 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 394 | SCM_SYSERROR; |
e1a191a8 GH |
395 | orig_handlers[i] = SIG_ERR; |
396 | scheme_handlers[i] = SCM_BOOL_F; | |
397 | } | |
398 | #endif | |
399 | } | |
400 | return SCM_UNSPECIFIED; | |
401 | } | |
1bbd0b84 | 402 | #undef FUNC_NAME |
0f2d19dd | 403 | |
adb2c53b | 404 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 405 | (SCM i), |
b380b885 MD |
406 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
407 | "number of seconds (an integer). It's advisable to install a signal\n" | |
408 | "handler for\n" | |
409 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
410 | "the process.\n\n" | |
411 | "The return value indicates the time remaining for the previous alarm,\n" | |
412 | "if any. The new value replaces the previous alarm. If there was\n" | |
413 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 414 | #define FUNC_NAME s_scm_alarm |
0f2d19dd JB |
415 | { |
416 | unsigned int j; | |
3b3b36dd | 417 | SCM_VALIDATE_INUM (1,i); |
e1a191a8 | 418 | j = alarm (SCM_INUM (i)); |
0f2d19dd JB |
419 | return SCM_MAKINUM (j); |
420 | } | |
1bbd0b84 | 421 | #undef FUNC_NAME |
0f2d19dd | 422 | |
53f8a0d2 RB |
423 | #ifdef HAVE_SETITIMER |
424 | SCM_DEFINE (scm_setitimer, "setitimer", 5, 0, 0, | |
425 | (SCM which_timer, | |
426 | SCM interval_seconds, SCM interval_microseconds, | |
427 | SCM value_seconds, SCM value_microseconds), | |
428 | "Set the timer specified by @var{which_timer} according to the given\n" | |
429 | "@var{interval_seconds}, @var{interval_microseconds},\n" | |
430 | "@var{value_seconds}, and @var{value_microseconds} values.\n" | |
431 | "\n" | |
432 | "Return information about the timer's previous setting." | |
433 | "\n" | |
434 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
435 | "Interface Conventions''.\n" | |
436 | "\n" | |
437 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL}, \n" | |
438 | "and @code{ITIMER_PROF}.\n" | |
439 | "\n" | |
440 | "The return value will be a list of two cons pairs representing the\n" | |
441 | "current state of the given timer. The first pair is the seconds and\n" | |
442 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
443 | "the seconds and microseconds of the timer @code{it_value}.\n") | |
444 | #define FUNC_NAME s_scm_setitimer | |
445 | { | |
446 | int rv; | |
447 | int c_which_timer; | |
448 | struct itimerval new_timer; | |
449 | struct itimerval old_timer; | |
450 | ||
451 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
452 | new_timer.it_interval.tv_sec = SCM_NUM2LONG(2, interval_seconds); | |
453 | new_timer.it_interval.tv_usec = SCM_NUM2LONG(3, interval_microseconds); | |
454 | new_timer.it_value.tv_sec = SCM_NUM2LONG(4, value_seconds); | |
455 | new_timer.it_value.tv_usec = SCM_NUM2LONG(5, value_microseconds); | |
456 | ||
457 | SCM_SYSCALL(rv = setitimer(c_which_timer, &new_timer, &old_timer)); | |
458 | ||
459 | if(rv != 0) | |
460 | SCM_SYSERROR; | |
461 | ||
462 | return scm_list_2(scm_cons(scm_long2num(old_timer.it_interval.tv_sec), | |
463 | scm_long2num(old_timer.it_interval.tv_usec)), | |
464 | scm_cons(scm_long2num(old_timer.it_value.tv_sec), | |
465 | scm_long2num(old_timer.it_value.tv_usec))); | |
466 | } | |
467 | #undef FUNC_NAME | |
468 | #endif /* HAVE_SETITIMER */ | |
469 | ||
470 | #ifdef HAVE_GETITIMER | |
471 | SCM_DEFINE (scm_getitimer, "getitimer", 1, 0, 0, | |
472 | (SCM which_timer), | |
473 | "Return information about the timer specified by @var{which_timer}" | |
474 | "\n" | |
475 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
476 | "Interface Conventions''.\n" | |
477 | "\n" | |
478 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL}, \n" | |
479 | "and @code{ITIMER_PROF}.\n" | |
480 | "\n" | |
481 | "The return value will be a list of two cons pairs representing the\n" | |
482 | "current state of the given timer. The first pair is the seconds and\n" | |
483 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
484 | "the seconds and microseconds of the timer @code{it_value}.\n") | |
485 | #define FUNC_NAME s_scm_getitimer | |
486 | { | |
487 | int rv; | |
488 | int c_which_timer; | |
489 | struct itimerval old_timer; | |
490 | ||
491 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
492 | ||
493 | SCM_SYSCALL(rv = getitimer(c_which_timer, &old_timer)); | |
494 | ||
495 | if(rv != 0) | |
496 | SCM_SYSERROR; | |
497 | ||
498 | return scm_list_2(scm_cons(scm_long2num(old_timer.it_interval.tv_sec), | |
499 | scm_long2num(old_timer.it_interval.tv_usec)), | |
500 | scm_cons(scm_long2num(old_timer.it_value.tv_sec), | |
501 | scm_long2num(old_timer.it_value.tv_usec))); | |
502 | } | |
503 | #undef FUNC_NAME | |
504 | #endif /* HAVE_GETITIMER */ | |
505 | ||
0e958795 | 506 | #ifdef HAVE_PAUSE |
adb2c53b | 507 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 508 | (), |
b380b885 MD |
509 | "Pause the current process (thread?) until a signal arrives whose\n" |
510 | "action is to either terminate the current process or invoke a\n" | |
511 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 512 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
513 | { |
514 | pause (); | |
515 | return SCM_UNSPECIFIED; | |
516 | } | |
1bbd0b84 | 517 | #undef FUNC_NAME |
0e958795 | 518 | #endif |
0f2d19dd | 519 | |
adb2c53b | 520 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 521 | (SCM i), |
b380b885 MD |
522 | "Wait for the given number of seconds (an integer) or until a signal\n" |
523 | "arrives. The return value is zero if the time elapses or the number\n" | |
524 | "of seconds remaining otherwise.") | |
1bbd0b84 | 525 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 526 | { |
b74f4728 | 527 | unsigned long j; |
3b3b36dd | 528 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
529 | #ifdef USE_THREADS |
530 | j = scm_thread_sleep (SCM_INUM(i)); | |
531 | #else | |
e1a191a8 | 532 | j = sleep (SCM_INUM(i)); |
b74f4728 JB |
533 | #endif |
534 | return scm_ulong2num (j); | |
0f2d19dd | 535 | } |
1bbd0b84 | 536 | #undef FUNC_NAME |
0f2d19dd | 537 | |
ed618cc9 | 538 | #if defined(USE_THREADS) || defined(HAVE_USLEEP) || defined(__MINGW32__) |
adb2c53b | 539 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 540 | (SCM i), |
5352393c MG |
541 | "Sleep for I microseconds. @code{usleep} is not available on\n" |
542 | "all platforms.") | |
1bbd0b84 | 543 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 544 | { |
3b3b36dd | 545 | SCM_VALIDATE_INUM_MIN (1,i,0); |
b74f4728 JB |
546 | |
547 | #ifdef USE_THREADS | |
548 | /* If we have threads, we use the thread system's sleep function. */ | |
549 | { | |
550 | unsigned long j = scm_thread_usleep (SCM_INUM (i)); | |
551 | return scm_ulong2num (j); | |
552 | } | |
553 | #else | |
0935d604 MD |
554 | #ifdef USLEEP_RETURNS_VOID |
555 | usleep (SCM_INUM (i)); | |
556 | return SCM_INUM0; | |
557 | #else | |
b74f4728 JB |
558 | { |
559 | int j = usleep (SCM_INUM (i)); | |
560 | return SCM_MAKINUM (j); | |
561 | } | |
0935d604 | 562 | #endif |
ce874f2d | 563 | #endif |
b74f4728 | 564 | } |
1bbd0b84 | 565 | #undef FUNC_NAME |
ed618cc9 | 566 | #endif /* USE_THREADS || HAVE_USLEEP || __MINGW32__ */ |
ce874f2d | 567 | |
adb2c53b | 568 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 569 | (SCM sig), |
b380b885 MD |
570 | "Sends a specified signal @var{sig} to the current process, where\n" |
571 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 572 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 573 | { |
3b3b36dd | 574 | SCM_VALIDATE_INUM (1,sig); |
e1a191a8 GH |
575 | SCM_DEFER_INTS; |
576 | if (kill (getpid (), (int) SCM_INUM (sig)) != 0) | |
1bbd0b84 | 577 | SCM_SYSERROR; |
e1a191a8 GH |
578 | SCM_ALLOW_INTS; |
579 | return SCM_UNSPECIFIED; | |
0f2d19dd | 580 | } |
1bbd0b84 | 581 | #undef FUNC_NAME |
0f2d19dd JB |
582 | |
583 | \f | |
0f2d19dd | 584 | |
e1a191a8 GH |
585 | void |
586 | scm_init_scmsigs () | |
0f2d19dd | 587 | { |
e1a191a8 GH |
588 | SCM thunk; |
589 | int i; | |
590 | ||
591 | signal_handlers = | |
86d31dfe MV |
592 | SCM_VARIABLE_LOC (scm_c_define ("signal-handlers", |
593 | scm_c_make_vector (NSIG, SCM_BOOL_F))); | |
9a441ddb MV |
594 | /* XXX - use scm_c_make_gsubr here instead of `define'? */ |
595 | thunk = scm_c_define_gsubr ("%deliver-signals", 0, 0, 0, | |
596 | sys_deliver_signals); | |
e1a191a8 GH |
597 | signal_async = scm_system_async (thunk); |
598 | ||
599 | for (i = 0; i < NSIG; i++) | |
600 | { | |
601 | got_signal[i] = 0; | |
602 | #ifdef HAVE_SIGACTION | |
603 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 604 | |
e1a191a8 GH |
605 | #else |
606 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 607 | #endif |
840ae05d | 608 | |
08b8c694 | 609 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce | 610 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
adb2c53b | 611 | signals really are restartable. don't rely on the same |
7ee92fce GH |
612 | run-time that configure got: reset the default for every signal. |
613 | */ | |
614 | #ifdef HAVE_SIGINTERRUPT | |
615 | siginterrupt (i, 0); | |
de881428 | 616 | #elif defined(SA_RESTART) |
840ae05d JB |
617 | { |
618 | struct sigaction action; | |
619 | ||
620 | sigaction (i, NULL, &action); | |
621 | if (!(action.sa_flags & SA_RESTART)) | |
622 | { | |
3efb80f2 | 623 | action.sa_flags |= SA_RESTART; |
840ae05d JB |
624 | sigaction (i, &action, NULL); |
625 | } | |
626 | } | |
7ee92fce GH |
627 | #endif |
628 | /* if neither siginterrupt nor SA_RESTART are available we may | |
629 | as well assume that signals are always restartable. */ | |
840ae05d | 630 | #endif |
e1a191a8 | 631 | } |
1cc91f1b | 632 | |
86d31dfe MV |
633 | scm_c_define ("NSIG", scm_long2num (NSIG)); |
634 | scm_c_define ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
635 | scm_c_define ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
e1a191a8 | 636 | #ifdef SA_NOCLDSTOP |
86d31dfe | 637 | scm_c_define ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); |
0f2d19dd | 638 | #endif |
e1a191a8 | 639 | #ifdef SA_RESTART |
86d31dfe | 640 | scm_c_define ("SA_RESTART", scm_long2num (SA_RESTART)); |
0f2d19dd | 641 | #endif |
1cc91f1b | 642 | |
53f8a0d2 RB |
643 | #if defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) |
644 | /* Stuff needed by setitimer and getitimer. */ | |
645 | scm_c_define ("ITIMER_REAL", SCM_MAKINUM (ITIMER_REAL)); | |
646 | scm_c_define ("ITIMER_VIRTUAL", SCM_MAKINUM (ITIMER_VIRTUAL)); | |
647 | scm_c_define ("ITIMER_PROF", SCM_MAKINUM (ITIMER_PROF)); | |
648 | #endif /* defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) */ | |
649 | ||
8dc9439f | 650 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 651 | #include "libguile/scmsigs.x" |
8dc9439f | 652 | #endif |
0f2d19dd JB |
653 | } |
654 | ||
89e00824 ML |
655 | |
656 | /* | |
657 | Local Variables: | |
658 | c-file-style: "gnu" | |
659 | End: | |
660 | */ |