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 | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
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> |
e6e2e95a MD |
26 | #include <errno.h> |
27 | ||
a0599745 | 28 | #include "libguile/_scm.h" |
0f2d19dd | 29 | |
a0599745 MD |
30 | #include "libguile/async.h" |
31 | #include "libguile/eval.h" | |
fdc28395 | 32 | #include "libguile/root.h" |
a0599745 | 33 | #include "libguile/vectors.h" |
1bbd0b84 | 34 | |
a0599745 MD |
35 | #include "libguile/validate.h" |
36 | #include "libguile/scmsigs.h" | |
20e6290e | 37 | |
0f2d19dd JB |
38 | #ifdef HAVE_UNISTD_H |
39 | #include <unistd.h> | |
40 | #endif | |
41 | ||
1bed8c28 GH |
42 | #ifdef HAVE_SYS_TIME_H |
43 | #include <sys/time.h> | |
44 | #endif | |
45 | ||
82893676 MG |
46 | #ifdef __MINGW32__ |
47 | #include <windows.h> | |
48 | #define alarm(sec) (0) | |
49 | /* This weird comma expression is because Sleep is void under Windows. */ | |
50 | #define sleep(sec) (Sleep ((sec) * 1000), 0) | |
ed618cc9 | 51 | #define usleep(usec) (Sleep ((usec) / 1000), 0) |
82893676 MG |
52 | #define kill(pid, sig) raise (sig) |
53 | #endif | |
54 | ||
0f2d19dd JB |
55 | \f |
56 | ||
e1a191a8 | 57 | /* SIGRETTYPE is the type that signal handlers return. See <signal.h> */ |
0f2d19dd JB |
58 | |
59 | #ifdef RETSIGTYPE | |
e1a191a8 | 60 | # define SIGRETTYPE RETSIGTYPE |
0f2d19dd | 61 | #else |
e1a191a8 GH |
62 | # ifdef STDC_HEADERS |
63 | # define SIGRETTYPE void | |
64 | # else | |
65 | # define SIGRETTYPE int | |
66 | # endif | |
0f2d19dd JB |
67 | #endif |
68 | ||
69 | \f | |
70 | ||
e1a191a8 | 71 | /* take_signal is installed as the C signal handler whenever a Scheme |
2fbc8609 MV |
72 | handler is set. when a signal arrives, take_signal will queue the |
73 | Scheme handler procedure for its thread. */ | |
0f2d19dd | 74 | |
0f2d19dd | 75 | |
2fbc8609 MV |
76 | /* Scheme vectors with information about a signal. signal_handlers |
77 | contains the handler procedure or #f, signal_handler_cells contains | |
dbbaa07c MV |
78 | pre-queued cells for the handler (since we can't do fancy things |
79 | during signal delivery), signal_cell_handlers contains the SCM | |
80 | value to be stuffed into the pre-queued cell upon delivery, and | |
81 | signal_handler_threads points to the thread that a signal should be | |
82 | delivered to. | |
2fbc8609 | 83 | */ |
e1a191a8 | 84 | static SCM *signal_handlers; |
2fbc8609 | 85 | static SCM signal_handler_cells; |
dbbaa07c | 86 | static SCM signal_cell_handlers; |
2fbc8609 | 87 | static SCM signal_handler_threads; |
0f2d19dd | 88 | |
e1a191a8 GH |
89 | /* saves the original C handlers, when a new handler is installed. |
90 | set to SIG_ERR if the original handler is installed. */ | |
91 | #ifdef HAVE_SIGACTION | |
92 | static struct sigaction orig_handlers[NSIG]; | |
93 | #else | |
da6e81b6 | 94 | static SIGRETTYPE (*orig_handlers[NSIG])(int); |
0f2d19dd JB |
95 | #endif |
96 | ||
dbbaa07c | 97 | |
e1a191a8 GH |
98 | static SIGRETTYPE |
99 | take_signal (int signum) | |
100 | { | |
2fbc8609 MV |
101 | if (signum >= 0 && signum < NSIG) |
102 | { | |
dbbaa07c MV |
103 | SCM cell = SCM_VECTOR_REF(signal_handler_cells, signum); |
104 | SCM handler = SCM_VECTOR_REF(signal_cell_handlers, signum); | |
105 | SCM thread = SCM_VECTOR_REF(signal_handler_threads, signum); | |
106 | scm_root_state *root = scm_i_thread_root (thread); | |
107 | if (SCM_CONSP (cell)) | |
108 | { | |
109 | SCM_SETCAR (cell, handler); | |
110 | root->pending_asyncs = 1; | |
111 | } | |
2fbc8609 | 112 | } |
dbbaa07c | 113 | |
2fbc8609 MV |
114 | #ifndef HAVE_SIGACTION |
115 | signal (signum, take_signal); | |
116 | #endif | |
e1a191a8 | 117 | } |
0f2d19dd | 118 | |
2fbc8609 MV |
119 | SCM |
120 | scm_sigaction (SCM signum, SCM handler, SCM flags) | |
e1a191a8 | 121 | { |
2fbc8609 MV |
122 | return scm_sigaction_for_thread (signum, handler, flags, SCM_UNDEFINED); |
123 | } | |
e1a191a8 | 124 | |
2fbc8609 MV |
125 | static SCM |
126 | close_1 (SCM proc, SCM arg) | |
127 | { | |
128 | return scm_primitive_eval_x (scm_list_3 (scm_sym_lambda, SCM_EOL, | |
129 | scm_list_2 (proc, arg))); | |
0f2d19dd JB |
130 | } |
131 | ||
dbbaa07c MV |
132 | /* Make sure that signal SIGNUM can be delivered to THREAD, using |
133 | HANDLER. THREAD and HANDLER must either both be non-#f (which | |
134 | means install the handler), or both #f (which means deinstall an | |
135 | existing handler). | |
136 | */ | |
137 | ||
138 | struct install_handler_data { | |
139 | int signum; | |
140 | SCM thread; | |
141 | SCM handler; | |
142 | }; | |
143 | ||
144 | static SCM | |
145 | scm_delq_spine_x (SCM cell, SCM list) | |
146 | { | |
147 | SCM s = list, prev = SCM_BOOL_F; | |
148 | ||
bc36d050 | 149 | while (!scm_is_eq (cell, s)) |
dbbaa07c MV |
150 | { |
151 | if (SCM_NULLP (s)) | |
152 | return list; | |
153 | prev = s; | |
154 | s = SCM_CDR (s); | |
155 | } | |
7888309b | 156 | if (scm_is_false (prev)) |
dbbaa07c MV |
157 | return SCM_CDR (cell); |
158 | else | |
159 | { | |
160 | SCM_SETCDR (prev, SCM_CDR (cell)); | |
161 | return list; | |
162 | } | |
163 | } | |
164 | ||
165 | static void * | |
166 | really_install_handler (void *data) | |
167 | { | |
168 | struct install_handler_data *args = data; | |
169 | int signum = args->signum; | |
170 | SCM thread = args->thread; | |
171 | SCM handler = args->handler; | |
172 | SCM cell; | |
173 | SCM old_thread; | |
174 | ||
175 | /* The following modifications are done while signals can be | |
176 | delivered. That is not a real problem since the signal handler | |
177 | will only touch the car of the handler cell and set the | |
178 | pending_asyncs trigger of a thread. While the data structures | |
179 | are in flux, the signal handler might store the wrong handler in | |
180 | the cell, or set pending_asyncs of the wrong thread. We fix this | |
181 | at the end by making sure that the cell has the right handler in | |
182 | it, if any, and that pending_asyncs is set for the new thread. | |
183 | */ | |
184 | ||
185 | /* Make sure we have a cell. */ | |
186 | cell = SCM_VECTOR_REF (signal_handler_cells, signum); | |
7888309b | 187 | if (scm_is_false (cell)) |
dbbaa07c MV |
188 | { |
189 | cell = scm_cons (SCM_BOOL_F, SCM_EOL); | |
190 | SCM_VECTOR_SET (signal_handler_cells, signum, cell); | |
191 | } | |
192 | ||
193 | /* Make sure it is queued for the right thread. */ | |
194 | old_thread = SCM_VECTOR_REF (signal_handler_threads, signum); | |
bc36d050 | 195 | if (!scm_is_eq (thread, old_thread)) |
dbbaa07c MV |
196 | { |
197 | scm_root_state *r; | |
7888309b | 198 | if (scm_is_true (old_thread)) |
dbbaa07c MV |
199 | { |
200 | r = scm_i_thread_root (old_thread); | |
201 | r->signal_asyncs = scm_delq_spine_x (cell, r->signal_asyncs); | |
202 | } | |
7888309b | 203 | if (scm_is_true (thread)) |
dbbaa07c MV |
204 | { |
205 | r = scm_i_thread_root (thread); | |
206 | SCM_SETCDR (cell, r->signal_asyncs); | |
207 | r->signal_asyncs = cell; | |
208 | /* Set pending_asyncs just in case. A signal that is | |
209 | delivered while we modify the data structures here might set | |
210 | pending_asyncs of old_thread. */ | |
211 | r->pending_asyncs = 1; | |
212 | } | |
213 | SCM_VECTOR_SET (signal_handler_threads, signum, thread); | |
214 | } | |
215 | ||
216 | /* Set the new handler. */ | |
7888309b | 217 | if (scm_is_false (handler)) |
dbbaa07c MV |
218 | { |
219 | SCM_VECTOR_SET (*signal_handlers, signum, SCM_BOOL_F); | |
220 | SCM_VECTOR_SET (signal_cell_handlers, signum, SCM_BOOL_F); | |
221 | } | |
222 | else | |
223 | { | |
224 | SCM_VECTOR_SET (*signal_handlers, signum, handler); | |
225 | SCM_VECTOR_SET (signal_cell_handlers, signum, | |
226 | close_1 (handler, scm_int2num (signum))); | |
227 | } | |
228 | ||
229 | /* Now fix up the cell. It might contain the old handler but since | |
230 | it is now queued for the new thread, we must make sure that the | |
231 | new handler is run. Any signal that is delivered during the | |
232 | following code will install the new handler, so we have no | |
233 | problem. | |
234 | */ | |
7888309b | 235 | if (scm_is_true (SCM_CAR (cell))) |
dbbaa07c MV |
236 | SCM_SETCAR (cell, SCM_VECTOR_REF (signal_cell_handlers, signum)); |
237 | ||
238 | /* Phfew. That should be it. */ | |
239 | return NULL; | |
240 | } | |
241 | ||
242 | static void | |
243 | install_handler (int signum, SCM thread, SCM handler) | |
244 | { | |
245 | /* We block asyncs while installing the handler. It would be safe | |
246 | to leave them on, but we might run the wrong handler should a | |
247 | signal be delivered. | |
248 | */ | |
249 | ||
250 | struct install_handler_data args; | |
251 | args.signum = signum; | |
252 | args.thread = thread; | |
253 | args.handler = handler; | |
254 | scm_c_call_with_blocked_asyncs (really_install_handler, &args); | |
255 | } | |
256 | ||
e1a191a8 | 257 | /* user interface for installation of signal handlers. */ |
2fbc8609 MV |
258 | SCM_DEFINE (scm_sigaction_for_thread, "sigaction", 1, 3, 0, |
259 | (SCM signum, SCM handler, SCM flags, SCM thread), | |
0d172d3f | 260 | "Install or report the signal handler for a specified signal.\n\n" |
b380b885 MD |
261 | "@var{signum} is the signal number, which can be specified using the value\n" |
262 | "of variables such as @code{SIGINT}.\n\n" | |
2fbc8609 | 263 | "If @var{handler} is omitted, @code{sigaction} returns a pair: the\n" |
b380b885 MD |
264 | "CAR is the current\n" |
265 | "signal hander, which will be either an integer with the value @code{SIG_DFL}\n" | |
266 | "(default action) or @code{SIG_IGN} (ignore), or the Scheme procedure which\n" | |
267 | "handles the signal, or @code{#f} if a non-Scheme procedure handles the\n" | |
268 | "signal. The CDR contains the current @code{sigaction} flags for the handler.\n\n" | |
2fbc8609 MV |
269 | "If @var{handler} is provided, it is installed as the new handler for\n" |
270 | "@var{signum}. @var{handler} can be a Scheme procedure taking one\n" | |
b380b885 MD |
271 | "argument, or the value of @code{SIG_DFL} (default action) or\n" |
272 | "@code{SIG_IGN} (ignore), or @code{#f} to restore whatever signal handler\n" | |
2fbc8609 MV |
273 | "was installed before @code{sigaction} was first used. When\n" |
274 | "a scheme procedure has been specified, that procedure will run\n" | |
275 | "in the given @var{thread}. When no thread has been given, the\n" | |
276 | "thread that made this call to @code{sigaction} is used.\n" | |
277 | "Flags can " | |
b380b885 | 278 | "optionally be specified for the new handler (@code{SA_RESTART} will\n" |
0d172d3f | 279 | "always be added if it's available and the system is using restartable\n" |
b380b885 MD |
280 | "system calls.) The return value is a pair with information about the\n" |
281 | "old handler as described above.\n\n" | |
282 | "This interface does not provide access to the \"signal blocking\"\n" | |
283 | "facility. Maybe this is not needed, since the thread support may\n" | |
284 | "provide solutions to the problem of consistent access to data\n" | |
285 | "structures.") | |
2fbc8609 | 286 | #define FUNC_NAME s_scm_sigaction_for_thread |
e1a191a8 GH |
287 | { |
288 | int csig; | |
289 | #ifdef HAVE_SIGACTION | |
290 | struct sigaction action; | |
291 | struct sigaction old_action; | |
292 | #else | |
af68e5e5 | 293 | SIGRETTYPE (* chandler) (int) = SIG_DFL; |
e1a191a8 GH |
294 | SIGRETTYPE (* old_chandler) (int); |
295 | #endif | |
296 | int query_only = 0; | |
297 | int save_handler = 0; | |
34d19ef6 | 298 | |
e1a191a8 GH |
299 | SCM old_handler; |
300 | ||
a55c2b68 MV |
301 | csig = scm_to_signed_integer (signum, 0, NSIG-1); |
302 | ||
7ee92fce GH |
303 | #if defined(HAVE_SIGACTION) |
304 | #if defined(SA_RESTART) && defined(HAVE_RESTARTABLE_SYSCALLS) | |
305 | /* don't allow SA_RESTART to be omitted if HAVE_RESTARTABLE_SYSCALLS | |
306 | is defined, since libguile would be likely to produce spurious | |
307 | EINTR errors. */ | |
e1a191a8 GH |
308 | action.sa_flags = SA_RESTART; |
309 | #else | |
310 | action.sa_flags = 0; | |
311 | #endif | |
312 | if (!SCM_UNBNDP (flags)) | |
a55c2b68 | 313 | action.sa_flags |= scm_to_int (flags); |
e1a191a8 | 314 | sigemptyset (&action.sa_mask); |
4feac0b9 MV |
315 | #endif |
316 | ||
2fbc8609 MV |
317 | if (SCM_UNBNDP (thread)) |
318 | thread = scm_current_thread (); | |
319 | else | |
dbbaa07c MV |
320 | { |
321 | SCM_VALIDATE_THREAD (4, thread); | |
322 | if (scm_c_thread_exited_p (thread)) | |
323 | SCM_MISC_ERROR ("thread has already exited", SCM_EOL); | |
324 | } | |
4feac0b9 | 325 | |
e1a191a8 | 326 | SCM_DEFER_INTS; |
2fbc8609 | 327 | old_handler = SCM_VECTOR_REF(*signal_handlers, csig); |
e1a191a8 GH |
328 | if (SCM_UNBNDP (handler)) |
329 | query_only = 1; | |
e11e83f3 | 330 | else if (scm_is_integer (handler)) |
e1a191a8 | 331 | { |
e4b265d8 DH |
332 | if (SCM_NUM2LONG (2, handler) == (long) SIG_DFL |
333 | || SCM_NUM2LONG (2, handler) == (long) SIG_IGN) | |
e1a191a8 GH |
334 | { |
335 | #ifdef HAVE_SIGACTION | |
e11e83f3 | 336 | action.sa_handler = (SIGRETTYPE (*) (int)) scm_to_int (handler); |
e1a191a8 | 337 | #else |
e11e83f3 | 338 | chandler = (SIGRETTYPE (*) (int)) scm_to_int (handler); |
e1a191a8 | 339 | #endif |
dbbaa07c | 340 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
341 | } |
342 | else | |
1bbd0b84 | 343 | SCM_OUT_OF_RANGE (2, handler); |
e1a191a8 | 344 | } |
7888309b | 345 | else if (scm_is_false (handler)) |
e1a191a8 GH |
346 | { |
347 | /* restore the default handler. */ | |
348 | #ifdef HAVE_SIGACTION | |
349 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
350 | query_only = 1; | |
351 | else | |
352 | { | |
353 | action = orig_handlers[csig]; | |
354 | orig_handlers[csig].sa_handler = SIG_ERR; | |
dbbaa07c | 355 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
356 | } |
357 | #else | |
358 | if (orig_handlers[csig] == SIG_ERR) | |
359 | query_only = 1; | |
360 | else | |
361 | { | |
362 | chandler = orig_handlers[csig]; | |
363 | orig_handlers[csig] = SIG_ERR; | |
dbbaa07c | 364 | install_handler (csig, SCM_BOOL_F, SCM_BOOL_F); |
e1a191a8 GH |
365 | } |
366 | #endif | |
adb2c53b | 367 | } |
e1a191a8 GH |
368 | else |
369 | { | |
43067cec | 370 | SCM_VALIDATE_PROC (2, handler); |
e1a191a8 GH |
371 | #ifdef HAVE_SIGACTION |
372 | action.sa_handler = take_signal; | |
373 | if (orig_handlers[csig].sa_handler == SIG_ERR) | |
374 | save_handler = 1; | |
375 | #else | |
376 | chandler = take_signal; | |
377 | if (orig_handlers[csig] == SIG_ERR) | |
378 | save_handler = 1; | |
379 | #endif | |
dbbaa07c | 380 | install_handler (csig, thread, handler); |
e1a191a8 | 381 | } |
adb2c53b | 382 | |
0d172d3f MV |
383 | /* XXX - Silently ignore setting handlers for `program error signals' |
384 | because they can't currently be handled by Scheme code. | |
385 | */ | |
386 | ||
387 | switch (csig) | |
388 | { | |
389 | /* This list of program error signals is from the GNU Libc | |
390 | Reference Manual */ | |
391 | case SIGFPE: | |
392 | case SIGILL: | |
393 | case SIGSEGV: | |
82893676 | 394 | #ifdef SIGBUS |
0d172d3f | 395 | case SIGBUS: |
82893676 | 396 | #endif |
0d172d3f | 397 | case SIGABRT: |
6732de1b | 398 | #if defined(SIGIOT) && (SIGIOT != SIGABRT) |
0d172d3f MV |
399 | case SIGIOT: |
400 | #endif | |
82893676 | 401 | #ifdef SIGTRAP |
0d172d3f | 402 | case SIGTRAP: |
82893676 | 403 | #endif |
0d172d3f MV |
404 | #ifdef SIGEMT |
405 | case SIGEMT: | |
406 | #endif | |
adb2c53b | 407 | #ifdef SIGSYS |
0d172d3f | 408 | case SIGSYS: |
adb2c53b | 409 | #endif |
0d172d3f MV |
410 | query_only = 1; |
411 | } | |
412 | ||
e1a191a8 GH |
413 | #ifdef HAVE_SIGACTION |
414 | if (query_only) | |
415 | { | |
416 | if (sigaction (csig, 0, &old_action) == -1) | |
1bbd0b84 | 417 | SCM_SYSERROR; |
e1a191a8 GH |
418 | } |
419 | else | |
420 | { | |
421 | if (sigaction (csig, &action , &old_action) == -1) | |
1bbd0b84 | 422 | SCM_SYSERROR; |
e1a191a8 GH |
423 | if (save_handler) |
424 | orig_handlers[csig] = old_action; | |
425 | } | |
426 | if (old_action.sa_handler == SIG_DFL || old_action.sa_handler == SIG_IGN) | |
7ee92fce | 427 | old_handler = scm_long2num ((long) old_action.sa_handler); |
e1a191a8 | 428 | SCM_ALLOW_INTS; |
e11e83f3 | 429 | return scm_cons (old_handler, scm_from_int (old_action.sa_flags)); |
e1a191a8 GH |
430 | #else |
431 | if (query_only) | |
432 | { | |
433 | if ((old_chandler = signal (csig, SIG_IGN)) == SIG_ERR) | |
1bbd0b84 | 434 | SCM_SYSERROR; |
e1a191a8 | 435 | if (signal (csig, old_chandler) == SIG_ERR) |
1bbd0b84 | 436 | SCM_SYSERROR; |
e1a191a8 GH |
437 | } |
438 | else | |
439 | { | |
440 | if ((old_chandler = signal (csig, chandler)) == SIG_ERR) | |
1bbd0b84 | 441 | SCM_SYSERROR; |
e1a191a8 GH |
442 | if (save_handler) |
443 | orig_handlers[csig] = old_chandler; | |
444 | } | |
445 | if (old_chandler == SIG_DFL || old_chandler == SIG_IGN) | |
da6e81b6 | 446 | old_handler = scm_long2num ((long) old_chandler); |
e1a191a8 | 447 | SCM_ALLOW_INTS; |
e11e83f3 | 448 | return scm_cons (old_handler, scm_from_int (0)); |
0f2d19dd | 449 | #endif |
e1a191a8 | 450 | } |
1bbd0b84 | 451 | #undef FUNC_NAME |
e1a191a8 | 452 | |
adb2c53b | 453 | SCM_DEFINE (scm_restore_signals, "restore-signals", 0, 0, 0, |
1bbd0b84 | 454 | (void), |
b380b885 MD |
455 | "Return all signal handlers to the values they had before any call to\n" |
456 | "@code{sigaction} was made. The return value is unspecified.") | |
1bbd0b84 | 457 | #define FUNC_NAME s_scm_restore_signals |
e1a191a8 GH |
458 | { |
459 | int i; | |
e1a191a8 GH |
460 | for (i = 0; i < NSIG; i++) |
461 | { | |
462 | #ifdef HAVE_SIGACTION | |
463 | if (orig_handlers[i].sa_handler != SIG_ERR) | |
464 | { | |
465 | if (sigaction (i, &orig_handlers[i], NULL) == -1) | |
1bbd0b84 | 466 | SCM_SYSERROR; |
e1a191a8 | 467 | orig_handlers[i].sa_handler = SIG_ERR; |
34d19ef6 | 468 | SCM_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
469 | } |
470 | #else | |
471 | if (orig_handlers[i] != SIG_ERR) | |
472 | { | |
473 | if (signal (i, orig_handlers[i]) == SIG_ERR) | |
1bbd0b84 | 474 | SCM_SYSERROR; |
e1a191a8 | 475 | orig_handlers[i] = SIG_ERR; |
34d19ef6 | 476 | SCM_VECTOR_SET (*signal_handlers, i, SCM_BOOL_F); |
e1a191a8 GH |
477 | } |
478 | #endif | |
479 | } | |
480 | return SCM_UNSPECIFIED; | |
481 | } | |
1bbd0b84 | 482 | #undef FUNC_NAME |
0f2d19dd | 483 | |
adb2c53b | 484 | SCM_DEFINE (scm_alarm, "alarm", 1, 0, 0, |
1bbd0b84 | 485 | (SCM i), |
b380b885 MD |
486 | "Set a timer to raise a @code{SIGALRM} signal after the specified\n" |
487 | "number of seconds (an integer). It's advisable to install a signal\n" | |
488 | "handler for\n" | |
489 | "@code{SIGALRM} beforehand, since the default action is to terminate\n" | |
490 | "the process.\n\n" | |
491 | "The return value indicates the time remaining for the previous alarm,\n" | |
492 | "if any. The new value replaces the previous alarm. If there was\n" | |
493 | "no previous alarm, the return value is zero.") | |
1bbd0b84 | 494 | #define FUNC_NAME s_scm_alarm |
0f2d19dd | 495 | { |
a55c2b68 | 496 | return scm_from_uint (alarm (scm_to_uint (i))); |
0f2d19dd | 497 | } |
1bbd0b84 | 498 | #undef FUNC_NAME |
0f2d19dd | 499 | |
53f8a0d2 RB |
500 | #ifdef HAVE_SETITIMER |
501 | SCM_DEFINE (scm_setitimer, "setitimer", 5, 0, 0, | |
502 | (SCM which_timer, | |
503 | SCM interval_seconds, SCM interval_microseconds, | |
504 | SCM value_seconds, SCM value_microseconds), | |
505 | "Set the timer specified by @var{which_timer} according to the given\n" | |
506 | "@var{interval_seconds}, @var{interval_microseconds},\n" | |
507 | "@var{value_seconds}, and @var{value_microseconds} values.\n" | |
508 | "\n" | |
509 | "Return information about the timer's previous setting." | |
510 | "\n" | |
511 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
512 | "Interface Conventions''.\n" | |
513 | "\n" | |
9401323e | 514 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
515 | "and @code{ITIMER_PROF}.\n" |
516 | "\n" | |
517 | "The return value will be a list of two cons pairs representing the\n" | |
518 | "current state of the given timer. The first pair is the seconds and\n" | |
519 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 520 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
521 | #define FUNC_NAME s_scm_setitimer |
522 | { | |
523 | int rv; | |
524 | int c_which_timer; | |
525 | struct itimerval new_timer; | |
526 | struct itimerval old_timer; | |
527 | ||
528 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
529 | new_timer.it_interval.tv_sec = SCM_NUM2LONG(2, interval_seconds); | |
530 | new_timer.it_interval.tv_usec = SCM_NUM2LONG(3, interval_microseconds); | |
531 | new_timer.it_value.tv_sec = SCM_NUM2LONG(4, value_seconds); | |
532 | new_timer.it_value.tv_usec = SCM_NUM2LONG(5, value_microseconds); | |
533 | ||
534 | SCM_SYSCALL(rv = setitimer(c_which_timer, &new_timer, &old_timer)); | |
535 | ||
536 | if(rv != 0) | |
537 | SCM_SYSERROR; | |
538 | ||
539 | return scm_list_2(scm_cons(scm_long2num(old_timer.it_interval.tv_sec), | |
540 | scm_long2num(old_timer.it_interval.tv_usec)), | |
541 | scm_cons(scm_long2num(old_timer.it_value.tv_sec), | |
542 | scm_long2num(old_timer.it_value.tv_usec))); | |
543 | } | |
544 | #undef FUNC_NAME | |
545 | #endif /* HAVE_SETITIMER */ | |
546 | ||
547 | #ifdef HAVE_GETITIMER | |
548 | SCM_DEFINE (scm_getitimer, "getitimer", 1, 0, 0, | |
549 | (SCM which_timer), | |
550 | "Return information about the timer specified by @var{which_timer}" | |
551 | "\n" | |
552 | "Errors are handled as described in the guile info pages under ``POSIX\n" | |
553 | "Interface Conventions''.\n" | |
554 | "\n" | |
9401323e | 555 | "The timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL},\n" |
53f8a0d2 RB |
556 | "and @code{ITIMER_PROF}.\n" |
557 | "\n" | |
558 | "The return value will be a list of two cons pairs representing the\n" | |
559 | "current state of the given timer. The first pair is the seconds and\n" | |
560 | "microseconds of the timer @code{it_interval}, and the second pair is\n" | |
9401323e | 561 | "the seconds and microseconds of the timer @code{it_value}.") |
53f8a0d2 RB |
562 | #define FUNC_NAME s_scm_getitimer |
563 | { | |
564 | int rv; | |
565 | int c_which_timer; | |
566 | struct itimerval old_timer; | |
567 | ||
568 | c_which_timer = SCM_NUM2INT(1, which_timer); | |
569 | ||
570 | SCM_SYSCALL(rv = getitimer(c_which_timer, &old_timer)); | |
571 | ||
572 | if(rv != 0) | |
573 | SCM_SYSERROR; | |
574 | ||
575 | return scm_list_2(scm_cons(scm_long2num(old_timer.it_interval.tv_sec), | |
576 | scm_long2num(old_timer.it_interval.tv_usec)), | |
577 | scm_cons(scm_long2num(old_timer.it_value.tv_sec), | |
578 | scm_long2num(old_timer.it_value.tv_usec))); | |
579 | } | |
580 | #undef FUNC_NAME | |
581 | #endif /* HAVE_GETITIMER */ | |
582 | ||
0e958795 | 583 | #ifdef HAVE_PAUSE |
adb2c53b | 584 | SCM_DEFINE (scm_pause, "pause", 0, 0, 0, |
1bbd0b84 | 585 | (), |
b380b885 MD |
586 | "Pause the current process (thread?) until a signal arrives whose\n" |
587 | "action is to either terminate the current process or invoke a\n" | |
588 | "handler procedure. The return value is unspecified.") | |
1bbd0b84 | 589 | #define FUNC_NAME s_scm_pause |
0f2d19dd JB |
590 | { |
591 | pause (); | |
592 | return SCM_UNSPECIFIED; | |
593 | } | |
1bbd0b84 | 594 | #undef FUNC_NAME |
0e958795 | 595 | #endif |
0f2d19dd | 596 | |
adb2c53b | 597 | SCM_DEFINE (scm_sleep, "sleep", 1, 0, 0, |
1bbd0b84 | 598 | (SCM i), |
b380b885 MD |
599 | "Wait for the given number of seconds (an integer) or until a signal\n" |
600 | "arrives. The return value is zero if the time elapses or the number\n" | |
601 | "of seconds remaining otherwise.") | |
1bbd0b84 | 602 | #define FUNC_NAME s_scm_sleep |
0f2d19dd | 603 | { |
a55c2b68 | 604 | return scm_from_ulong (scm_thread_sleep (scm_to_int (i))); |
0f2d19dd | 605 | } |
1bbd0b84 | 606 | #undef FUNC_NAME |
0f2d19dd | 607 | |
adb2c53b | 608 | SCM_DEFINE (scm_usleep, "usleep", 1, 0, 0, |
1bbd0b84 | 609 | (SCM i), |
a55c2b68 | 610 | "Sleep for @var{i} microseconds.") |
1bbd0b84 | 611 | #define FUNC_NAME s_scm_usleep |
ce874f2d | 612 | { |
a55c2b68 | 613 | return scm_from_ulong (scm_thread_usleep (scm_to_ulong (i))); |
b74f4728 | 614 | } |
1bbd0b84 | 615 | #undef FUNC_NAME |
ce874f2d | 616 | |
adb2c53b | 617 | SCM_DEFINE (scm_raise, "raise", 1, 0, 0, |
1bbd0b84 | 618 | (SCM sig), |
b380b885 MD |
619 | "Sends a specified signal @var{sig} to the current process, where\n" |
620 | "@var{sig} is as described for the kill procedure.") | |
1bbd0b84 | 621 | #define FUNC_NAME s_scm_raise |
0f2d19dd | 622 | { |
a55c2b68 | 623 | if (kill (getpid (), scm_to_int (sig)) != 0) |
1bbd0b84 | 624 | SCM_SYSERROR; |
e1a191a8 | 625 | return SCM_UNSPECIFIED; |
0f2d19dd | 626 | } |
1bbd0b84 | 627 | #undef FUNC_NAME |
0f2d19dd JB |
628 | |
629 | \f | |
0f2d19dd | 630 | |
e1a191a8 GH |
631 | void |
632 | scm_init_scmsigs () | |
0f2d19dd | 633 | { |
e1a191a8 GH |
634 | int i; |
635 | ||
636 | signal_handlers = | |
86d31dfe MV |
637 | SCM_VARIABLE_LOC (scm_c_define ("signal-handlers", |
638 | scm_c_make_vector (NSIG, SCM_BOOL_F))); | |
2fbc8609 MV |
639 | signal_handler_cells = |
640 | scm_permanent_object (scm_c_make_vector (NSIG, SCM_BOOL_F)); | |
dbbaa07c MV |
641 | signal_cell_handlers = |
642 | scm_permanent_object (scm_c_make_vector (NSIG, SCM_BOOL_F)); | |
2fbc8609 MV |
643 | signal_handler_threads = |
644 | scm_permanent_object (scm_c_make_vector (NSIG, SCM_BOOL_F)); | |
e1a191a8 GH |
645 | |
646 | for (i = 0; i < NSIG; i++) | |
647 | { | |
e1a191a8 GH |
648 | #ifdef HAVE_SIGACTION |
649 | orig_handlers[i].sa_handler = SIG_ERR; | |
840ae05d | 650 | |
e1a191a8 GH |
651 | #else |
652 | orig_handlers[i] = SIG_ERR; | |
0f2d19dd | 653 | #endif |
840ae05d | 654 | |
08b8c694 | 655 | #ifdef HAVE_RESTARTABLE_SYSCALLS |
7ee92fce | 656 | /* If HAVE_RESTARTABLE_SYSCALLS is defined, it's important that |
adb2c53b | 657 | signals really are restartable. don't rely on the same |
7ee92fce GH |
658 | run-time that configure got: reset the default for every signal. |
659 | */ | |
660 | #ifdef HAVE_SIGINTERRUPT | |
661 | siginterrupt (i, 0); | |
de881428 | 662 | #elif defined(SA_RESTART) |
840ae05d JB |
663 | { |
664 | struct sigaction action; | |
665 | ||
666 | sigaction (i, NULL, &action); | |
667 | if (!(action.sa_flags & SA_RESTART)) | |
668 | { | |
3efb80f2 | 669 | action.sa_flags |= SA_RESTART; |
840ae05d JB |
670 | sigaction (i, &action, NULL); |
671 | } | |
672 | } | |
7ee92fce GH |
673 | #endif |
674 | /* if neither siginterrupt nor SA_RESTART are available we may | |
675 | as well assume that signals are always restartable. */ | |
840ae05d | 676 | #endif |
e1a191a8 | 677 | } |
1cc91f1b | 678 | |
86d31dfe MV |
679 | scm_c_define ("NSIG", scm_long2num (NSIG)); |
680 | scm_c_define ("SIG_IGN", scm_long2num ((long) SIG_IGN)); | |
681 | scm_c_define ("SIG_DFL", scm_long2num ((long) SIG_DFL)); | |
e1a191a8 | 682 | #ifdef SA_NOCLDSTOP |
86d31dfe | 683 | scm_c_define ("SA_NOCLDSTOP", scm_long2num (SA_NOCLDSTOP)); |
0f2d19dd | 684 | #endif |
e1a191a8 | 685 | #ifdef SA_RESTART |
86d31dfe | 686 | scm_c_define ("SA_RESTART", scm_long2num (SA_RESTART)); |
0f2d19dd | 687 | #endif |
1cc91f1b | 688 | |
53f8a0d2 RB |
689 | #if defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) |
690 | /* Stuff needed by setitimer and getitimer. */ | |
e11e83f3 MV |
691 | scm_c_define ("ITIMER_REAL", scm_from_int (ITIMER_REAL)); |
692 | scm_c_define ("ITIMER_VIRTUAL", scm_from_int (ITIMER_VIRTUAL)); | |
693 | scm_c_define ("ITIMER_PROF", scm_from_int (ITIMER_PROF)); | |
53f8a0d2 RB |
694 | #endif /* defined(HAVE_SETITIMER) || defined(HAVE_GETITIMER) */ |
695 | ||
a0599745 | 696 | #include "libguile/scmsigs.x" |
0f2d19dd JB |
697 | } |
698 | ||
89e00824 ML |
699 | |
700 | /* | |
701 | Local Variables: | |
702 | c-file-style: "gnu" | |
703 | End: | |
704 | */ |