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2fbc8609 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002 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 | 104 | /* take_signal is installed as the C signal handler whenever a Scheme |
2fbc8609 MV |
105 | handler is set. when a signal arrives, take_signal will queue the |
106 | Scheme handler procedure for its thread. */ | |
0f2d19dd | 107 | |
0f2d19dd | 108 | |
2fbc8609 MV |
109 | /* Scheme vectors with information about a signal. signal_handlers |
110 | contains the handler procedure or #f, signal_handler_cells contains | |
111 | preallocated cells for queuing the handler in take_signal since we | |
112 | can't allocate during signal delivery, signal_handler_threads | |
113 | points to the thread that a signal should be delivered to. | |
114 | */ | |
e1a191a8 | 115 | static SCM *signal_handlers; |
2fbc8609 MV |
116 | static SCM signal_handler_cells; |
117 | static SCM signal_handler_threads; | |
0f2d19dd | 118 | |
e1a191a8 GH |
119 | /* saves the original C handlers, when a new handler is installed. |
120 | set to SIG_ERR if the original handler is installed. */ | |
121 | #ifdef HAVE_SIGACTION | |
122 | static struct sigaction orig_handlers[NSIG]; | |
123 | #else | |
da6e81b6 | 124 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
125 | #endif |
126 | ||
e1a191a8 GH |
127 | static SIGRETTYPE |
128 | take_signal (int signum) | |
129 | { | |
2fbc8609 MV |
130 | if (signum >= 0 && signum < NSIG) |
131 | { | |
132 | SCM thread = SCM_VECTOR_REF (signal_handler_threads, signum); | |
133 | scm_i_queue_async_cell (SCM_VECTOR_REF(signal_handler_cells, signum), | |
134 | scm_i_thread_root (thread)); | |
135 | } | |
136 | #ifndef HAVE_SIGACTION | |
137 | signal (signum, take_signal); | |
138 | #endif | |
e1a191a8 | 139 | } |
0f2d19dd | 140 | |
2fbc8609 MV |
141 | SCM |
142 | scm_sigaction (SCM signum, SCM handler, SCM flags) | |
e1a191a8 | 143 | { |
2fbc8609 MV |
144 | return scm_sigaction_for_thread (signum, handler, flags, SCM_UNDEFINED); |
145 | } | |
e1a191a8 | 146 | |
2fbc8609 MV |
147 | static SCM |
148 | close_1 (SCM proc, SCM arg) | |
149 | { | |
150 | return scm_primitive_eval_x (scm_list_3 (scm_sym_lambda, SCM_EOL, | |
151 | scm_list_2 (proc, arg))); | |
0f2d19dd JB |
152 | } |
153 | ||
e1a191a8 | 154 | /* user interface for installation of signal handlers. */ |
2fbc8609 MV |
155 | SCM_DEFINE (scm_sigaction_for_thread, "sigaction", 1, 3, 0, |
156 | (SCM signum, SCM handler, SCM flags, SCM thread), | |
0d172d3f | 157 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
158 | "@var{signum} is the signal number, which can be specified using the value\n" |
159 | "of variables such as @code{SIGINT}.\n\n" | |
2fbc8609 | 160 | "If @var{handler} is omitted, @code{sigaction} returns a pair: the\n" |
b380b885 MD |
161 | "CAR is the current\n" |
162 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
163 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
164 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
165 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
2fbc8609 MV |
166 | "If @var{handler} is provided, it is installed as the new handler for\n" |
167 | "@var{signum}. @var{handler} can be a Scheme procedure taking one\n" | |
b380b885 MD |
168 | "argument, or the value of @code{SIG_DFL} (default action) or\n" |
169 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
2fbc8609 MV |
170 | "was installed before @code{sigaction} was first used. When\n" |
171 | "a scheme procedure has been specified, that procedure will run\n" | |
172 | "in the given @var{thread}. When no thread has been given, the\n" | |
173 | "thread that made this call to @code{sigaction} is used.\n" | |
174 | "Flags can " | |
b380b885 | 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.") | |
2fbc8609 | 183 | #define FUNC_NAME s_scm_sigaction_for_thread |
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); |
2fbc8609 MV |
199 | if (csig < 0 || csig > NSIG) |
200 | SCM_OUT_OF_RANGE (1, signum); | |
7ee92fce GH |
201 | #if defined(HAVE_SIGACTION) |
202 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
203 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
204 | is defined, since libguile would be likely to produce spurious | |
205 | EINTR errors. */ | |
e1a191a8 GH |
206 | action.sa_flags = SA_RESTART; |
207 | #else | |
208 | action.sa_flags = 0; | |
209 | #endif | |
210 | if (!SCM_UNBNDP (flags)) | |
211 | { | |
34d19ef6 | 212 | SCM_VALIDATE_INUM (3, flags); |
e1a191a8 GH |
213 | action.sa_flags |= SCM_INUM (flags); |
214 | } | |
215 | sigemptyset (&action.sa_mask); | |
2fbc8609 MV |
216 | if (SCM_UNBNDP (thread)) |
217 | thread = scm_current_thread (); | |
218 | else | |
219 | SCM_VALIDATE_THREAD (4, thread); | |
e1a191a8 GH |
220 | #endif |
221 | SCM_DEFER_INTS; | |
2fbc8609 | 222 | old_handler = SCM_VECTOR_REF(*signal_handlers, csig); |
e1a191a8 GH |
223 | if (SCM_UNBNDP (handler)) |
224 | query_only = 1; | |
9a09deb1 | 225 | else if (SCM_EQ_P (scm_integer_p (handler), SCM_BOOL_T)) |
e1a191a8 | 226 | { |
e4b265d8 DH |
227 | if (SCM_NUM2LONG (2, handler) == (long) SIG_DFL |
228 | || SCM_NUM2LONG (2, handler) == (long) SIG_IGN) | |
e1a191a8 GH |
229 | { |
230 | #ifdef HAVE_SIGACTION | |
231 | action.sa_handler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
232 | #else | |
233 | chandler = (SIGRETTYPE (*) (int)) SCM_INUM (handler); | |
234 | #endif | |
34d19ef6 | 235 | SCM_VECTOR_SET (*signal_handlers, csig, SCM_BOOL_F); |
e1a191a8 GH |
236 | } |
237 | else | |
1bbd0b84 | 238 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 GH |
239 | } |
240 | else if (SCM_FALSEP (handler)) | |
241 | { | |
242 | /* restore the default handler. */ | |
243 | #ifdef HAVE_SIGACTION | |
244 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
245 | query_only = 1; | |
246 | else | |
247 | { | |
248 | action = orig_handlers[csig]; | |
249 | orig_handlers[csig].sa_handler = SIG_ERR; | |
34d19ef6 HWN |
250 | SCM_VECTOR_SET (*signal_handlers, csig, SCM_BOOL_F); |
251 | ||
e1a191a8 GH |
252 | } |
253 | #else | |
254 | if (orig_handlers[csig] == SIG_ERR) | |
255 | query_only = 1; | |
256 | else | |
257 | { | |
258 | chandler = orig_handlers[csig]; | |
259 | orig_handlers[csig] = SIG_ERR; | |
34d19ef6 | 260 | SCM_VECTOR_SET (*signal_handlers, csig, SCM_BOOL_F); |
e1a191a8 GH |
261 | } |
262 | #endif | |
adb2c53b | 263 | } |
e1a191a8 GH |
264 | else |
265 | { | |
34d19ef6 | 266 | SCM_VALIDATE_NIM (2, handler); |
e1a191a8 GH |
267 | #ifdef HAVE_SIGACTION |
268 | action.sa_handler = take_signal; | |
269 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
270 | save_handler = 1; | |
271 | #else | |
272 | chandler = take_signal; | |
273 | if (orig_handlers[csig] == SIG_ERR) | |
274 | save_handler = 1; | |
275 | #endif | |
34d19ef6 | 276 | SCM_VECTOR_SET (*signal_handlers, csig, handler); |
2fbc8609 | 277 | SCM_VECTOR_SET (signal_handler_cells, csig, |
e581432e | 278 | scm_cons (close_1 (handler, signum), SCM_BOOL_F)); |
2fbc8609 | 279 | SCM_VECTOR_SET (signal_handler_threads, csig, thread); |
e1a191a8 | 280 | } |
adb2c53b | 281 | |
0d172d3f MV |
282 | /* XXX - Silently ignore setting handlers for `program error signals' |
283 | because they can't currently be handled by Scheme code. | |
284 | */ | |
285 | ||
286 | switch (csig) | |
287 | { | |
288 | /* This list of program error signals is from the GNU Libc | |
289 | Reference Manual */ | |
290 | case SIGFPE: | |
291 | case SIGILL: | |
292 | case SIGSEGV: | |
82893676 | 293 | #ifdef SIGBUS |
0d172d3f | 294 | case SIGBUS: |
82893676 | 295 | #endif |
0d172d3f | 296 | case SIGABRT: |
6732de1b | 297 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
298 | case SIGIOT: |
299 | #endif | |
82893676 | 300 | #ifdef SIGTRAP |
0d172d3f | 301 | case SIGTRAP: |
82893676 | 302 | #endif |
0d172d3f MV |
303 | #ifdef SIGEMT |
304 | case SIGEMT: | |
305 | #endif | |
adb2c53b | 306 | #ifdef SIGSYS |
0d172d3f | 307 | case SIGSYS: |
adb2c53b | 308 | #endif |
0d172d3f MV |
309 | query_only = 1; |
310 | } | |
311 | ||
e1a191a8 GH |
312 | #ifdef HAVE_SIGACTION |
313 | if (query_only) | |
314 | { | |
315 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 316 | SCM_SYSERROR; |
e1a191a8 GH |
317 | } |
318 | else | |
319 | { | |
320 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 321 | SCM_SYSERROR; |
e1a191a8 GH |
322 | if (save_handler) |
323 | orig_handlers[csig] = old_action; | |
324 | } | |
325 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 326 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 GH |
327 | SCM_ALLOW_INTS; |
328 | return scm_cons (old_handler, SCM_MAKINUM (old_action.sa_flags)); | |
329 | #else | |
330 | if (query_only) | |
331 | { | |
332 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 333 | SCM_SYSERROR; |
e1a191a8 | 334 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 335 | SCM_SYSERROR; |
e1a191a8 GH |
336 | } |
337 | else | |
338 | { | |
339 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 340 | SCM_SYSERROR; |
e1a191a8 GH |
341 | if (save_handler) |
342 | orig_handlers[csig] = old_chandler; | |
343 | } | |
344 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
da6e81b6 | 345 | old_handler = scm_long2num ((long) old_chandler); |
e1a191a8 GH |
346 | SCM_ALLOW_INTS; |
347 | return scm_cons (old_handler, SCM_MAKINUM (0)); | |
0f2d19dd | 348 | #endif |
e1a191a8 | 349 | } |
1bbd0b84 | 350 | #undef FUNC_NAME |
e1a191a8 | 351 | |
adb2c53b | 352 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 353 | (void), |
b380b885 MD |
354 | "Return all signal handlers to the values they had before any call to\n" |
355 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 356 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
357 | { |
358 | int i; | |
e1a191a8 GH |
359 | for (i = 0; i < NSIG; i++) |
360 | { | |
361 | #ifdef HAVE_SIGACTION | |
362 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
363 | { | |
364 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 365 | SCM_SYSERROR; |
e1a191a8 | 366 | orig_handlers[i].sa_handler = SIG_ERR; |
34d19ef6 | 367 | SCM_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
368 | } |
369 | #else | |
370 | if (orig_handlers[i] != SIG_ERR) | |
371 | { | |
372 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 373 | SCM_SYSERROR; |
e1a191a8 | 374 | orig_handlers[i] = SIG_ERR; |
34d19ef6 | 375 | SCM_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
376 | } |
377 | #endif | |
378 | } | |
379 | return SCM_UNSPECIFIED; | |
380 | } | |
1bbd0b84 | 381 | #undef FUNC_NAME |
0f2d19dd | 382 | |
adb2c53b | 383 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 384 | (SCM i), |
b380b885 MD |
385 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
386 | "number of seconds (an integer). It's advisable to install a signal\n" | |
387 | "handler for\n" | |
388 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
389 | "the process.\n\n" | |
390 | "The return value indicates the time remaining for the previous alarm,\n" | |
391 | "if any. The new value replaces the previous alarm. If there was\n" | |
392 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 393 | #define FUNC_NAME s_scm_alarm |
0f2d19dd JB |
394 | { |
395 | unsigned int j; | |
34d19ef6 | 396 | SCM_VALIDATE_INUM (1, i); |
e1a191a8 | 397 | j = alarm (SCM_INUM (i)); |
0f2d19dd JB |
398 | return SCM_MAKINUM (j); |
399 | } | |
1bbd0b84 | 400 | #undef FUNC_NAME |
0f2d19dd | 401 | |
53f8a0d2 RB |
402 | #ifdef HAVE_SETITIMER |
403 | SCM_DEFINE (scm_setitimer, "setitimer", 5, 0, 0, | |
404 | (SCM which_timer, | |
405 | SCM interval_seconds, SCM interval_microseconds, | |
406 | SCM value_seconds, SCM value_microseconds), | |
407 | "Set the timer specified by @var{which_timer} according to the given\n" | |
408 | "@var{interval_seconds}, @var{interval_microseconds},\n" | |
409 | "@var{value_seconds}, and @var{value_microseconds} values.\n" | |
410 | "\n" | |
411 | "Return information about the timer's previous setting." | |
412 | "\n" | |
413 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
414 | "Interface Conventions''.\n" | |
415 | "\n" | |
9401323e | 416 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
417 | "and @code{ITIMER_PROF}.\n" |
418 | "\n" | |
419 | "The return value will be a list of two cons pairs representing the\n" | |
420 | "current state of the given timer. The first pair is the seconds and\n" | |
421 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 422 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
423 | #define FUNC_NAME s_scm_setitimer |
424 | { | |
425 | int rv; | |
426 | int c_which_timer; | |
427 | struct itimerval new_timer; | |
428 | struct itimerval old_timer; | |
429 | ||
430 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
431 | new_timer.it_interval.tv_sec = SCM_NUM2LONG(2, interval_seconds); | |
432 | new_timer.it_interval.tv_usec = SCM_NUM2LONG(3, interval_microseconds); | |
433 | new_timer.it_value.tv_sec = SCM_NUM2LONG(4, value_seconds); | |
434 | new_timer.it_value.tv_usec = SCM_NUM2LONG(5, value_microseconds); | |
435 | ||
436 | SCM_SYSCALL(rv = setitimer(c_which_timer, &new_timer, &old_timer)); | |
437 | ||
438 | if(rv != 0) | |
439 | SCM_SYSERROR; | |
440 | ||
441 | return scm_list_2(scm_cons(scm_long2num(old_timer.it_interval.tv_sec), | |
442 | scm_long2num(old_timer.it_interval.tv_usec)), | |
443 | scm_cons(scm_long2num(old_timer.it_value.tv_sec), | |
444 | scm_long2num(old_timer.it_value.tv_usec))); | |
445 | } | |
446 | #undef FUNC_NAME | |
447 | #endif /* HAVE_SETITIMER */ | |
448 | ||
449 | #ifdef HAVE_GETITIMER | |
450 | SCM_DEFINE (scm_getitimer, "getitimer", 1, 0, 0, | |
451 | (SCM which_timer), | |
452 | "Return information about the timer specified by @var{which_timer}" | |
453 | "\n" | |
454 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
455 | "Interface Conventions''.\n" | |
456 | "\n" | |
9401323e | 457 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
458 | "and @code{ITIMER_PROF}.\n" |
459 | "\n" | |
460 | "The return value will be a list of two cons pairs representing the\n" | |
461 | "current state of the given timer. The first pair is the seconds and\n" | |
462 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 463 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
464 | #define FUNC_NAME s_scm_getitimer |
465 | { | |
466 | int rv; | |
467 | int c_which_timer; | |
468 | struct itimerval old_timer; | |
469 | ||
470 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
471 | ||
472 | SCM_SYSCALL(rv = getitimer(c_which_timer, &old_timer)); | |
473 | ||
474 | if(rv != 0) | |
475 | SCM_SYSERROR; | |
476 | ||
477 | return scm_list_2(scm_cons(scm_long2num(old_timer.it_interval.tv_sec), | |
478 | scm_long2num(old_timer.it_interval.tv_usec)), | |
479 | scm_cons(scm_long2num(old_timer.it_value.tv_sec), | |
480 | scm_long2num(old_timer.it_value.tv_usec))); | |
481 | } | |
482 | #undef FUNC_NAME | |
483 | #endif /* HAVE_GETITIMER */ | |
484 | ||
0e958795 | 485 | #ifdef HAVE_PAUSE |
adb2c53b | 486 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 487 | (), |
b380b885 MD |
488 | "Pause the current process (thread?) until a signal arrives whose\n" |
489 | "action is to either terminate the current process or invoke a\n" | |
490 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 491 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
492 | { |
493 | pause (); | |
494 | return SCM_UNSPECIFIED; | |
495 | } | |
1bbd0b84 | 496 | #undef FUNC_NAME |
0e958795 | 497 | #endif |
0f2d19dd | 498 | |
adb2c53b | 499 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 500 | (SCM i), |
b380b885 MD |
501 | "Wait for the given number of seconds (an integer) or until a signal\n" |
502 | "arrives. The return value is zero if the time elapses or the number\n" | |
503 | "of seconds remaining otherwise.") | |
1bbd0b84 | 504 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 505 | { |
b74f4728 | 506 | unsigned long j; |
34d19ef6 | 507 | SCM_VALIDATE_INUM_MIN (1, i,0); |
b74f4728 JB |
508 | #ifdef USE_THREADS |
509 | j = scm_thread_sleep (SCM_INUM(i)); | |
510 | #else | |
e1a191a8 | 511 | j = sleep (SCM_INUM(i)); |
b74f4728 JB |
512 | #endif |
513 | return scm_ulong2num (j); | |
0f2d19dd | 514 | } |
1bbd0b84 | 515 | #undef FUNC_NAME |
0f2d19dd | 516 | |
ed618cc9 | 517 | #if defined(USE_THREADS) || defined(HAVE_USLEEP) || defined(__MINGW32__) |
adb2c53b | 518 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 519 | (SCM i), |
5352393c MG |
520 | "Sleep for I microseconds. @code{usleep} is not available on\n" |
521 | "all platforms.") | |
1bbd0b84 | 522 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 523 | { |
34d19ef6 | 524 | SCM_VALIDATE_INUM_MIN (1, i,0); |
b74f4728 JB |
525 | |
526 | #ifdef USE_THREADS | |
527 | /* If we have threads, we use the thread system's sleep function. */ | |
528 | { | |
529 | unsigned long j = scm_thread_usleep (SCM_INUM (i)); | |
530 | return scm_ulong2num (j); | |
531 | } | |
532 | #else | |
0935d604 MD |
533 | #ifdef USLEEP_RETURNS_VOID |
534 | usleep (SCM_INUM (i)); | |
535 | return SCM_INUM0; | |
536 | #else | |
b74f4728 JB |
537 | { |
538 | int j = usleep (SCM_INUM (i)); | |
539 | return SCM_MAKINUM (j); | |
540 | } | |
0935d604 | 541 | #endif |
ce874f2d | 542 | #endif |
b74f4728 | 543 | } |
1bbd0b84 | 544 | #undef FUNC_NAME |
ed618cc9 | 545 | #endif /* USE_THREADS || HAVE_USLEEP || __MINGW32__ */ |
ce874f2d | 546 | |
adb2c53b | 547 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 548 | (SCM sig), |
b380b885 MD |
549 | "Sends a specified signal @var{sig} to the current process, where\n" |
550 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 551 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 552 | { |
34d19ef6 | 553 | SCM_VALIDATE_INUM (1, sig); |
e1a191a8 GH |
554 | SCM_DEFER_INTS; |
555 | if (kill (getpid (), (int) SCM_INUM (sig)) != 0) | |
1bbd0b84 | 556 | SCM_SYSERROR; |
e1a191a8 GH |
557 | SCM_ALLOW_INTS; |
558 | return SCM_UNSPECIFIED; | |
0f2d19dd | 559 | } |
1bbd0b84 | 560 | #undef FUNC_NAME |
0f2d19dd JB |
561 | |
562 | \f | |
0f2d19dd | 563 | |
e1a191a8 GH |
564 | void |
565 | scm_init_scmsigs () | |
0f2d19dd | 566 | { |
e1a191a8 GH |
567 | int i; |
568 | ||
569 | signal_handlers = | |
86d31dfe MV |
570 | SCM_VARIABLE_LOC (scm_c_define ("signal-handlers", |
571 | scm_c_make_vector (NSIG, SCM_BOOL_F))); | |
2fbc8609 MV |
572 | signal_handler_cells = |
573 | scm_permanent_object (scm_c_make_vector (NSIG, SCM_BOOL_F)); | |
574 | signal_handler_threads = | |
575 | scm_permanent_object (scm_c_make_vector (NSIG, SCM_BOOL_F)); | |
e1a191a8 GH |
576 | |
577 | for (i = 0; i < NSIG; i++) | |
578 | { | |
e1a191a8 GH |
579 | #ifdef HAVE_SIGACTION |
580 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 581 | |
e1a191a8 GH |
582 | #else |
583 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 584 | #endif |
840ae05d | 585 | |
08b8c694 | 586 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce | 587 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
adb2c53b | 588 | signals really are restartable. don't rely on the same |
7ee92fce GH |
589 | run-time that configure got: reset the default for every signal. |
590 | */ | |
591 | #ifdef HAVE_SIGINTERRUPT | |
592 | siginterrupt (i, 0); | |
de881428 | 593 | #elif defined(SA_RESTART) |
840ae05d JB |
594 | { |
595 | struct sigaction action; | |
596 | ||
597 | sigaction (i, NULL, &action); | |
598 | if (!(action.sa_flags & SA_RESTART)) | |
599 | { | |
3efb80f2 | 600 | action.sa_flags |= SA_RESTART; |
840ae05d JB |
601 | sigaction (i, &action, NULL); |
602 | } | |
603 | } | |
7ee92fce GH |
604 | #endif |
605 | /* if neither siginterrupt nor SA_RESTART are available we may | |
606 | as well assume that signals are always restartable. */ | |
840ae05d | 607 | #endif |
e1a191a8 | 608 | } |
1cc91f1b | 609 | |
86d31dfe MV |
610 | scm_c_define ("NSIG", scm_long2num (NSIG)); |
611 | scm_c_define ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
612 | scm_c_define ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
e1a191a8 | 613 | #ifdef SA_NOCLDSTOP |
86d31dfe | 614 | scm_c_define ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); |
0f2d19dd | 615 | #endif |
e1a191a8 | 616 | #ifdef SA_RESTART |
86d31dfe | 617 | scm_c_define ("SA_RESTART", scm_long2num (SA_RESTART)); |
0f2d19dd | 618 | #endif |
1cc91f1b | 619 | |
53f8a0d2 RB |
620 | #if defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) |
621 | /* Stuff needed by setitimer and getitimer. */ | |
622 | scm_c_define ("ITIMER_REAL", SCM_MAKINUM (ITIMER_REAL)); | |
623 | scm_c_define ("ITIMER_VIRTUAL", SCM_MAKINUM (ITIMER_VIRTUAL)); | |
624 | scm_c_define ("ITIMER_PROF", SCM_MAKINUM (ITIMER_PROF)); | |
625 | #endif /* defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) */ | |
626 | ||
a0599745 | 627 | #include "libguile/scmsigs.x" |
0f2d19dd JB |
628 | } |
629 | ||
89e00824 ML |
630 | |
631 | /* | |
632 | Local Variables: | |
633 | c-file-style: "gnu" | |
634 | End: | |
635 | */ |