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 | { | |
e1a191a8 | 129 | got_signal[signum] = 1; |
7123fc3b | 130 | scm_system_async_mark_from_signal_handler (signal_async); |
e1a191a8 | 131 | } |
0f2d19dd | 132 | |
e1a191a8 GH |
133 | static SCM |
134 | sys_deliver_signals (void) | |
135 | { | |
136 | int i; | |
137 | ||
138 | for (i = 0; i < NSIG; i++) | |
139 | { | |
140 | if (got_signal[i]) | |
141 | { | |
cc0b3312 GH |
142 | /* The flag is reset before calling the handler in case the |
143 | handler doesn't return. If the handler doesn't return | |
144 | but leaves other signals flagged, they their handlers | |
145 | will be applied some time later when the async is checked | |
146 | again. It would probably be better to reset the flags | |
147 | after doing a longjmp. */ | |
e1a191a8 GH |
148 | got_signal[i] = 0; |
149 | #ifndef HAVE_SIGACTION | |
150 | signal (i, take_signal); | |
151 | #endif | |
fdc28395 | 152 | scm_call_1 (SCM_VELTS (*signal_handlers)[i], SCM_MAKINUM (i)); |
e1a191a8 GH |
153 | } |
154 | } | |
155 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
156 | } |
157 | ||
e1a191a8 | 158 | /* user interface for installation of signal handlers. */ |
adb2c53b | 159 | SCM_DEFINE (scm_sigaction, "sigaction", 1, 2, 0, |
1bbd0b84 | 160 | (SCM signum, SCM handler, SCM flags), |
0d172d3f | 161 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
162 | "@var{signum} is the signal number, which can be specified using the value\n" |
163 | "of variables such as @code{SIGINT}.\n\n" | |
164 | "If @var{action} is omitted, @code{sigaction} returns a pair: the\n" | |
165 | "CAR is the current\n" | |
166 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
167 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
168 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
169 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
170 | "If @var{action} is provided, it is installed as the new handler for\n" | |
171 | "@var{signum}. @var{action} can be a Scheme procedure taking one\n" | |
172 | "argument, or the value of @code{SIG_DFL} (default action) or\n" | |
173 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
174 | "was installed before @code{sigaction} was first used. Flags can\n" | |
175 | "optionally be specified for the new handler (@code{SA_RESTART} will\n" | |
0d172d3f | 176 | "always be added if it's available and the system is using restartable\n" |
b380b885 MD |
177 | "system calls.) The return value is a pair with information about the\n" |
178 | "old handler as described above.\n\n" | |
179 | "This interface does not provide access to the \"signal blocking\"\n" | |
180 | "facility. Maybe this is not needed, since the thread support may\n" | |
181 | "provide solutions to the problem of consistent access to data\n" | |
182 | "structures.") | |
1bbd0b84 | 183 | #define FUNC_NAME s_scm_sigaction |
e1a191a8 GH |
184 | { |
185 | int csig; | |
186 | #ifdef HAVE_SIGACTION | |
187 | struct sigaction action; | |
188 | struct sigaction old_action; | |
189 | #else | |
af68e5e5 | 190 | SIGRETTYPE (* chandler) (int) = SIG_DFL; |
e1a191a8 GH |
191 | SIGRETTYPE (* old_chandler) (int); |
192 | #endif | |
193 | int query_only = 0; | |
194 | int save_handler = 0; | |
34d19ef6 | 195 | |
e1a191a8 GH |
196 | SCM old_handler; |
197 | ||
34d19ef6 | 198 | SCM_VALIDATE_INUM_COPY (1, signum, csig); |
7ee92fce GH |
199 | #if defined(HAVE_SIGACTION) |
200 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
201 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
202 | is defined, since libguile would be likely to produce spurious | |
203 | EINTR errors. */ | |
e1a191a8 GH |
204 | action.sa_flags = SA_RESTART; |
205 | #else | |
206 | action.sa_flags = 0; | |
207 | #endif | |
208 | if (!SCM_UNBNDP (flags)) | |
209 | { | |
34d19ef6 | 210 | SCM_VALIDATE_INUM (3, flags); |
e1a191a8 GH |
211 | action.sa_flags |= SCM_INUM (flags); |
212 | } | |
213 | sigemptyset (&action.sa_mask); | |
214 | #endif | |
215 | SCM_DEFER_INTS; | |
34d19ef6 | 216 | old_handler = SCM_VELTS(*signal_handlers)[csig]; |
e1a191a8 GH |
217 | if (SCM_UNBNDP (handler)) |
218 | query_only = 1; | |
9a09deb1 | 219 | else if (SCM_EQ_P (scm_integer_p (handler), SCM_BOOL_T)) |
e1a191a8 | 220 | { |
e4b265d8 DH |
221 | if (SCM_NUM2LONG (2, handler) == (long) SIG_DFL |
222 | || SCM_NUM2LONG (2, handler) == (long) SIG_IGN) | |
e1a191a8 GH |
223 | { |
224 | #ifdef HAVE_SIGACTION | |
225 | action.sa_handler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
226 | #else | |
227 | chandler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
228 | #endif | |
34d19ef6 | 229 | SCM_VECTOR_SET (*signal_handlers, csig, SCM_BOOL_F); |
e1a191a8 GH |
230 | } |
231 | else | |
1bbd0b84 | 232 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 GH |
233 | } |
234 | else if (SCM_FALSEP (handler)) | |
235 | { | |
236 | /* restore the default handler. */ | |
237 | #ifdef HAVE_SIGACTION | |
238 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
239 | query_only = 1; | |
240 | else | |
241 | { | |
242 | action = orig_handlers[csig]; | |
243 | orig_handlers[csig].sa_handler = SIG_ERR; | |
34d19ef6 HWN |
244 | SCM_VECTOR_SET (*signal_handlers, csig, SCM_BOOL_F); |
245 | ||
e1a191a8 GH |
246 | } |
247 | #else | |
248 | if (orig_handlers[csig] == SIG_ERR) | |
249 | query_only = 1; | |
250 | else | |
251 | { | |
252 | chandler = orig_handlers[csig]; | |
253 | orig_handlers[csig] = SIG_ERR; | |
34d19ef6 | 254 | SCM_VECTOR_SET (*signal_handlers, csig, SCM_BOOL_F); |
e1a191a8 GH |
255 | } |
256 | #endif | |
adb2c53b | 257 | } |
e1a191a8 GH |
258 | else |
259 | { | |
34d19ef6 | 260 | SCM_VALIDATE_NIM (2, handler); |
e1a191a8 GH |
261 | #ifdef HAVE_SIGACTION |
262 | action.sa_handler = take_signal; | |
263 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
264 | save_handler = 1; | |
265 | #else | |
266 | chandler = take_signal; | |
267 | if (orig_handlers[csig] == SIG_ERR) | |
268 | save_handler = 1; | |
269 | #endif | |
34d19ef6 | 270 | SCM_VECTOR_SET (*signal_handlers, csig, handler); |
e1a191a8 | 271 | } |
adb2c53b | 272 | |
0d172d3f MV |
273 | /* XXX - Silently ignore setting handlers for `program error signals' |
274 | because they can't currently be handled by Scheme code. | |
275 | */ | |
276 | ||
277 | switch (csig) | |
278 | { | |
279 | /* This list of program error signals is from the GNU Libc | |
280 | Reference Manual */ | |
281 | case SIGFPE: | |
282 | case SIGILL: | |
283 | case SIGSEGV: | |
82893676 | 284 | #ifdef SIGBUS |
0d172d3f | 285 | case SIGBUS: |
82893676 | 286 | #endif |
0d172d3f | 287 | case SIGABRT: |
6732de1b | 288 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
289 | case SIGIOT: |
290 | #endif | |
82893676 | 291 | #ifdef SIGTRAP |
0d172d3f | 292 | case SIGTRAP: |
82893676 | 293 | #endif |
0d172d3f MV |
294 | #ifdef SIGEMT |
295 | case SIGEMT: | |
296 | #endif | |
adb2c53b | 297 | #ifdef SIGSYS |
0d172d3f | 298 | case SIGSYS: |
adb2c53b | 299 | #endif |
0d172d3f MV |
300 | query_only = 1; |
301 | } | |
302 | ||
e1a191a8 GH |
303 | #ifdef HAVE_SIGACTION |
304 | if (query_only) | |
305 | { | |
306 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 307 | SCM_SYSERROR; |
e1a191a8 GH |
308 | } |
309 | else | |
310 | { | |
311 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 312 | SCM_SYSERROR; |
e1a191a8 GH |
313 | if (save_handler) |
314 | orig_handlers[csig] = old_action; | |
315 | } | |
316 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 317 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 GH |
318 | SCM_ALLOW_INTS; |
319 | return scm_cons (old_handler, SCM_MAKINUM (old_action.sa_flags)); | |
320 | #else | |
321 | if (query_only) | |
322 | { | |
323 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 324 | SCM_SYSERROR; |
e1a191a8 | 325 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 326 | SCM_SYSERROR; |
e1a191a8 GH |
327 | } |
328 | else | |
329 | { | |
330 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 331 | SCM_SYSERROR; |
e1a191a8 GH |
332 | if (save_handler) |
333 | orig_handlers[csig] = old_chandler; | |
334 | } | |
335 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
da6e81b6 | 336 | old_handler = scm_long2num ((long) old_chandler); |
e1a191a8 GH |
337 | SCM_ALLOW_INTS; |
338 | return scm_cons (old_handler, SCM_MAKINUM (0)); | |
0f2d19dd | 339 | #endif |
e1a191a8 | 340 | } |
1bbd0b84 | 341 | #undef FUNC_NAME |
e1a191a8 | 342 | |
adb2c53b | 343 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 344 | (void), |
b380b885 MD |
345 | "Return all signal handlers to the values they had before any call to\n" |
346 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 347 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
348 | { |
349 | int i; | |
e1a191a8 GH |
350 | for (i = 0; i < NSIG; i++) |
351 | { | |
352 | #ifdef HAVE_SIGACTION | |
353 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
354 | { | |
355 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 356 | SCM_SYSERROR; |
e1a191a8 | 357 | orig_handlers[i].sa_handler = SIG_ERR; |
34d19ef6 | 358 | SCM_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
359 | } |
360 | #else | |
361 | if (orig_handlers[i] != SIG_ERR) | |
362 | { | |
363 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 364 | SCM_SYSERROR; |
e1a191a8 | 365 | orig_handlers[i] = SIG_ERR; |
34d19ef6 | 366 | SCM_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
367 | } |
368 | #endif | |
369 | } | |
370 | return SCM_UNSPECIFIED; | |
371 | } | |
1bbd0b84 | 372 | #undef FUNC_NAME |
0f2d19dd | 373 | |
adb2c53b | 374 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 375 | (SCM i), |
b380b885 MD |
376 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
377 | "number of seconds (an integer). It's advisable to install a signal\n" | |
378 | "handler for\n" | |
379 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
380 | "the process.\n\n" | |
381 | "The return value indicates the time remaining for the previous alarm,\n" | |
382 | "if any. The new value replaces the previous alarm. If there was\n" | |
383 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 384 | #define FUNC_NAME s_scm_alarm |
0f2d19dd JB |
385 | { |
386 | unsigned int j; | |
34d19ef6 | 387 | SCM_VALIDATE_INUM (1, i); |
e1a191a8 | 388 | j = alarm (SCM_INUM (i)); |
0f2d19dd JB |
389 | return SCM_MAKINUM (j); |
390 | } | |
1bbd0b84 | 391 | #undef FUNC_NAME |
0f2d19dd | 392 | |
53f8a0d2 RB |
393 | #ifdef HAVE_SETITIMER |
394 | SCM_DEFINE (scm_setitimer, "setitimer", 5, 0, 0, | |
395 | (SCM which_timer, | |
396 | SCM interval_seconds, SCM interval_microseconds, | |
397 | SCM value_seconds, SCM value_microseconds), | |
398 | "Set the timer specified by @var{which_timer} according to the given\n" | |
399 | "@var{interval_seconds}, @var{interval_microseconds},\n" | |
400 | "@var{value_seconds}, and @var{value_microseconds} values.\n" | |
401 | "\n" | |
402 | "Return information about the timer's previous setting." | |
403 | "\n" | |
404 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
405 | "Interface Conventions''.\n" | |
406 | "\n" | |
9401323e | 407 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
408 | "and @code{ITIMER_PROF}.\n" |
409 | "\n" | |
410 | "The return value will be a list of two cons pairs representing the\n" | |
411 | "current state of the given timer. The first pair is the seconds and\n" | |
412 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 413 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
414 | #define FUNC_NAME s_scm_setitimer |
415 | { | |
416 | int rv; | |
417 | int c_which_timer; | |
418 | struct itimerval new_timer; | |
419 | struct itimerval old_timer; | |
420 | ||
421 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
422 | new_timer.it_interval.tv_sec = SCM_NUM2LONG(2, interval_seconds); | |
423 | new_timer.it_interval.tv_usec = SCM_NUM2LONG(3, interval_microseconds); | |
424 | new_timer.it_value.tv_sec = SCM_NUM2LONG(4, value_seconds); | |
425 | new_timer.it_value.tv_usec = SCM_NUM2LONG(5, value_microseconds); | |
426 | ||
427 | SCM_SYSCALL(rv = setitimer(c_which_timer, &new_timer, &old_timer)); | |
428 | ||
429 | if(rv != 0) | |
430 | SCM_SYSERROR; | |
431 | ||
432 | return scm_list_2(scm_cons(scm_long2num(old_timer.it_interval.tv_sec), | |
433 | scm_long2num(old_timer.it_interval.tv_usec)), | |
434 | scm_cons(scm_long2num(old_timer.it_value.tv_sec), | |
435 | scm_long2num(old_timer.it_value.tv_usec))); | |
436 | } | |
437 | #undef FUNC_NAME | |
438 | #endif /* HAVE_SETITIMER */ | |
439 | ||
440 | #ifdef HAVE_GETITIMER | |
441 | SCM_DEFINE (scm_getitimer, "getitimer", 1, 0, 0, | |
442 | (SCM which_timer), | |
443 | "Return information about the timer specified by @var{which_timer}" | |
444 | "\n" | |
445 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
446 | "Interface Conventions''.\n" | |
447 | "\n" | |
9401323e | 448 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
449 | "and @code{ITIMER_PROF}.\n" |
450 | "\n" | |
451 | "The return value will be a list of two cons pairs representing the\n" | |
452 | "current state of the given timer. The first pair is the seconds and\n" | |
453 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 454 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
455 | #define FUNC_NAME s_scm_getitimer |
456 | { | |
457 | int rv; | |
458 | int c_which_timer; | |
459 | struct itimerval old_timer; | |
460 | ||
461 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
462 | ||
463 | SCM_SYSCALL(rv = getitimer(c_which_timer, &old_timer)); | |
464 | ||
465 | if(rv != 0) | |
466 | SCM_SYSERROR; | |
467 | ||
468 | return scm_list_2(scm_cons(scm_long2num(old_timer.it_interval.tv_sec), | |
469 | scm_long2num(old_timer.it_interval.tv_usec)), | |
470 | scm_cons(scm_long2num(old_timer.it_value.tv_sec), | |
471 | scm_long2num(old_timer.it_value.tv_usec))); | |
472 | } | |
473 | #undef FUNC_NAME | |
474 | #endif /* HAVE_GETITIMER */ | |
475 | ||
0e958795 | 476 | #ifdef HAVE_PAUSE |
adb2c53b | 477 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 478 | (), |
b380b885 MD |
479 | "Pause the current process (thread?) until a signal arrives whose\n" |
480 | "action is to either terminate the current process or invoke a\n" | |
481 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 482 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
483 | { |
484 | pause (); | |
485 | return SCM_UNSPECIFIED; | |
486 | } | |
1bbd0b84 | 487 | #undef FUNC_NAME |
0e958795 | 488 | #endif |
0f2d19dd | 489 | |
adb2c53b | 490 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 491 | (SCM i), |
b380b885 MD |
492 | "Wait for the given number of seconds (an integer) or until a signal\n" |
493 | "arrives. The return value is zero if the time elapses or the number\n" | |
494 | "of seconds remaining otherwise.") | |
1bbd0b84 | 495 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 496 | { |
b74f4728 | 497 | unsigned long j; |
34d19ef6 | 498 | SCM_VALIDATE_INUM_MIN (1, i,0); |
b74f4728 JB |
499 | #ifdef USE_THREADS |
500 | j = scm_thread_sleep (SCM_INUM(i)); | |
501 | #else | |
e1a191a8 | 502 | j = sleep (SCM_INUM(i)); |
b74f4728 JB |
503 | #endif |
504 | return scm_ulong2num (j); | |
0f2d19dd | 505 | } |
1bbd0b84 | 506 | #undef FUNC_NAME |
0f2d19dd | 507 | |
ed618cc9 | 508 | #if defined(USE_THREADS) || defined(HAVE_USLEEP) || defined(__MINGW32__) |
adb2c53b | 509 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 510 | (SCM i), |
5352393c MG |
511 | "Sleep for I microseconds. @code{usleep} is not available on\n" |
512 | "all platforms.") | |
1bbd0b84 | 513 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 514 | { |
34d19ef6 | 515 | SCM_VALIDATE_INUM_MIN (1, i,0); |
b74f4728 JB |
516 | |
517 | #ifdef USE_THREADS | |
518 | /* If we have threads, we use the thread system's sleep function. */ | |
519 | { | |
520 | unsigned long j = scm_thread_usleep (SCM_INUM (i)); | |
521 | return scm_ulong2num (j); | |
522 | } | |
523 | #else | |
0935d604 MD |
524 | #ifdef USLEEP_RETURNS_VOID |
525 | usleep (SCM_INUM (i)); | |
526 | return SCM_INUM0; | |
527 | #else | |
b74f4728 JB |
528 | { |
529 | int j = usleep (SCM_INUM (i)); | |
530 | return SCM_MAKINUM (j); | |
531 | } | |
0935d604 | 532 | #endif |
ce874f2d | 533 | #endif |
b74f4728 | 534 | } |
1bbd0b84 | 535 | #undef FUNC_NAME |
ed618cc9 | 536 | #endif /* USE_THREADS || HAVE_USLEEP || __MINGW32__ */ |
ce874f2d | 537 | |
adb2c53b | 538 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 539 | (SCM sig), |
b380b885 MD |
540 | "Sends a specified signal @var{sig} to the current process, where\n" |
541 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 542 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 543 | { |
34d19ef6 | 544 | SCM_VALIDATE_INUM (1, sig); |
e1a191a8 GH |
545 | SCM_DEFER_INTS; |
546 | if (kill (getpid (), (int) SCM_INUM (sig)) != 0) | |
1bbd0b84 | 547 | SCM_SYSERROR; |
e1a191a8 GH |
548 | SCM_ALLOW_INTS; |
549 | return SCM_UNSPECIFIED; | |
0f2d19dd | 550 | } |
1bbd0b84 | 551 | #undef FUNC_NAME |
0f2d19dd JB |
552 | |
553 | \f | |
0f2d19dd | 554 | |
e1a191a8 GH |
555 | void |
556 | scm_init_scmsigs () | |
0f2d19dd | 557 | { |
e1a191a8 GH |
558 | SCM thunk; |
559 | int i; | |
560 | ||
561 | signal_handlers = | |
86d31dfe MV |
562 | SCM_VARIABLE_LOC (scm_c_define ("signal-handlers", |
563 | scm_c_make_vector (NSIG, SCM_BOOL_F))); | |
9a441ddb MV |
564 | /* XXX - use scm_c_make_gsubr here instead of `define'? */ |
565 | thunk = scm_c_define_gsubr ("%deliver-signals", 0, 0, 0, | |
566 | sys_deliver_signals); | |
e1a191a8 GH |
567 | signal_async = scm_system_async (thunk); |
568 | ||
569 | for (i = 0; i < NSIG; i++) | |
570 | { | |
571 | got_signal[i] = 0; | |
572 | #ifdef HAVE_SIGACTION | |
573 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 574 | |
e1a191a8 GH |
575 | #else |
576 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 577 | #endif |
840ae05d | 578 | |
08b8c694 | 579 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce | 580 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
adb2c53b | 581 | signals really are restartable. don't rely on the same |
7ee92fce GH |
582 | run-time that configure got: reset the default for every signal. |
583 | */ | |
584 | #ifdef HAVE_SIGINTERRUPT | |
585 | siginterrupt (i, 0); | |
de881428 | 586 | #elif defined(SA_RESTART) |
840ae05d JB |
587 | { |
588 | struct sigaction action; | |
589 | ||
590 | sigaction (i, NULL, &action); | |
591 | if (!(action.sa_flags & SA_RESTART)) | |
592 | { | |
3efb80f2 | 593 | action.sa_flags |= SA_RESTART; |
840ae05d JB |
594 | sigaction (i, &action, NULL); |
595 | } | |
596 | } | |
7ee92fce GH |
597 | #endif |
598 | /* if neither siginterrupt nor SA_RESTART are available we may | |
599 | as well assume that signals are always restartable. */ | |
840ae05d | 600 | #endif |
e1a191a8 | 601 | } |
1cc91f1b | 602 | |
86d31dfe MV |
603 | scm_c_define ("NSIG", scm_long2num (NSIG)); |
604 | scm_c_define ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
605 | scm_c_define ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
e1a191a8 | 606 | #ifdef SA_NOCLDSTOP |
86d31dfe | 607 | scm_c_define ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); |
0f2d19dd | 608 | #endif |
e1a191a8 | 609 | #ifdef SA_RESTART |
86d31dfe | 610 | scm_c_define ("SA_RESTART", scm_long2num (SA_RESTART)); |
0f2d19dd | 611 | #endif |
1cc91f1b | 612 | |
53f8a0d2 RB |
613 | #if defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) |
614 | /* Stuff needed by setitimer and getitimer. */ | |
615 | scm_c_define ("ITIMER_REAL", SCM_MAKINUM (ITIMER_REAL)); | |
616 | scm_c_define ("ITIMER_VIRTUAL", SCM_MAKINUM (ITIMER_VIRTUAL)); | |
617 | scm_c_define ("ITIMER_PROF", SCM_MAKINUM (ITIMER_PROF)); | |
618 | #endif /* defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) */ | |
619 | ||
a0599745 | 620 | #include "libguile/scmsigs.x" |
0f2d19dd JB |
621 | } |
622 | ||
89e00824 ML |
623 | |
624 | /* | |
625 | Local Variables: | |
626 | c-file-style: "gnu" | |
627 | End: | |
628 | */ |