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6db30f83 PE |
1 | /* A GNU-like <signal.h>. |
2 | ||
caf8a9b2 | 3 | Copyright (C) 2006-2012 Free Software Foundation, Inc. |
6db30f83 PE |
4 | |
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #if __GNUC__ >= 3 | |
19 | @PRAGMA_SYSTEM_HEADER@ | |
20 | #endif | |
21 | @PRAGMA_COLUMNS@ | |
22 | ||
2a84b02d PE |
23 | #if defined __need_sig_atomic_t || defined __need_sigset_t || defined _GL_ALREADY_INCLUDING_SIGNAL_H || (defined _SIGNAL_H && !defined __SIZEOF_PTHREAD_MUTEX_T) |
24 | /* Special invocation convention: | |
25 | - Inside glibc header files. | |
26 | - On glibc systems we have a sequence of nested includes | |
27 | <signal.h> -> <ucontext.h> -> <signal.h>. | |
28 | In this situation, the functions are not yet declared, therefore we cannot | |
29 | provide the C++ aliases. | |
30 | - On glibc systems with GCC 4.3 we have a sequence of nested includes | |
31 | <csignal> -> </usr/include/signal.h> -> <sys/ucontext.h> -> <signal.h>. | |
32 | In this situation, some of the functions are not yet declared, therefore | |
33 | we cannot provide the C++ aliases. */ | |
6db30f83 PE |
34 | |
35 | # @INCLUDE_NEXT@ @NEXT_SIGNAL_H@ | |
36 | ||
37 | #else | |
38 | /* Normal invocation convention. */ | |
39 | ||
40 | #ifndef _@GUARD_PREFIX@_SIGNAL_H | |
41 | ||
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42 | #define _GL_ALREADY_INCLUDING_SIGNAL_H |
43 | ||
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44 | /* Define pid_t, uid_t. |
45 | Also, mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. | |
46 | On Solaris 10, <signal.h> includes <sys/types.h>, which eventually includes | |
47 | us; so include <sys/types.h> now, before the second inclusion guard. */ | |
48 | #include <sys/types.h> | |
49 | ||
50 | /* The include_next requires a split double-inclusion guard. */ | |
51 | #@INCLUDE_NEXT@ @NEXT_SIGNAL_H@ | |
52 | ||
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53 | #undef _GL_ALREADY_INCLUDING_SIGNAL_H |
54 | ||
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55 | #ifndef _@GUARD_PREFIX@_SIGNAL_H |
56 | #define _@GUARD_PREFIX@_SIGNAL_H | |
57 | ||
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58 | /* MacOS X 10.3, FreeBSD 6.4, OpenBSD 3.8, OSF/1 4.0, Solaris 2.6 declare |
59 | pthread_sigmask in <pthread.h>, not in <signal.h>. | |
60 | But avoid namespace pollution on glibc systems.*/ | |
61 | #if (@GNULIB_PTHREAD_SIGMASK@ || defined GNULIB_POSIXCHECK) \ | |
62 | && ((defined __APPLE__ && defined __MACH__) || defined __FreeBSD__ || defined __OpenBSD__ || defined __osf__ || defined __sun) \ | |
63 | && ! defined __GLIBC__ | |
64 | # include <pthread.h> | |
65 | #endif | |
66 | ||
6db30f83 PE |
67 | /* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */ |
68 | ||
69 | /* The definition of _GL_ARG_NONNULL is copied here. */ | |
70 | ||
71 | /* The definition of _GL_WARN_ON_USE is copied here. */ | |
72 | ||
73 | /* On AIX, sig_atomic_t already includes volatile. C99 requires that | |
74 | 'volatile sig_atomic_t' ignore the extra modifier, but C89 did not. | |
75 | Hence, redefine this to a non-volatile type as needed. */ | |
76 | #if ! @HAVE_TYPE_VOLATILE_SIG_ATOMIC_T@ | |
77 | # if !GNULIB_defined_sig_atomic_t | |
78 | typedef int rpl_sig_atomic_t; | |
79 | # undef sig_atomic_t | |
80 | # define sig_atomic_t rpl_sig_atomic_t | |
81 | # define GNULIB_defined_sig_atomic_t 1 | |
82 | # endif | |
83 | #endif | |
84 | ||
85 | /* A set or mask of signals. */ | |
86 | #if !@HAVE_SIGSET_T@ | |
87 | # if !GNULIB_defined_sigset_t | |
88 | typedef unsigned int sigset_t; | |
89 | # define GNULIB_defined_sigset_t 1 | |
90 | # endif | |
91 | #endif | |
92 | ||
93 | /* Define sighandler_t, the type of signal handlers. A GNU extension. */ | |
94 | #if !@HAVE_SIGHANDLER_T@ | |
95 | # ifdef __cplusplus | |
96 | extern "C" { | |
97 | # endif | |
98 | # if !GNULIB_defined_sighandler_t | |
99 | typedef void (*sighandler_t) (int); | |
100 | # define GNULIB_defined_sighandler_t 1 | |
101 | # endif | |
102 | # ifdef __cplusplus | |
103 | } | |
104 | # endif | |
105 | #endif | |
106 | ||
107 | ||
108 | #if @GNULIB_SIGNAL_H_SIGPIPE@ | |
109 | # ifndef SIGPIPE | |
110 | /* Define SIGPIPE to a value that does not overlap with other signals. */ | |
111 | # define SIGPIPE 13 | |
112 | # define GNULIB_defined_SIGPIPE 1 | |
113 | /* To actually use SIGPIPE, you also need the gnulib modules 'sigprocmask', | |
114 | 'write', 'stdio'. */ | |
115 | # endif | |
116 | #endif | |
117 | ||
118 | ||
119 | /* Maximum signal number + 1. */ | |
120 | #ifndef NSIG | |
121 | # if defined __TANDEM | |
122 | # define NSIG 32 | |
123 | # endif | |
124 | #endif | |
125 | ||
126 | ||
127 | #if @GNULIB_PTHREAD_SIGMASK@ | |
128 | # if @REPLACE_PTHREAD_SIGMASK@ | |
2a84b02d PE |
129 | # if !(defined __cplusplus && defined GNULIB_NAMESPACE) |
130 | # undef pthread_sigmask | |
131 | # define pthread_sigmask rpl_pthread_sigmask | |
132 | # endif | |
133 | _GL_FUNCDECL_RPL (pthread_sigmask, int, | |
134 | (int how, const sigset_t *new_mask, sigset_t *old_mask)); | |
135 | _GL_CXXALIAS_RPL (pthread_sigmask, int, | |
136 | (int how, const sigset_t *new_mask, sigset_t *old_mask)); | |
137 | # else | |
138 | # if !@HAVE_PTHREAD_SIGMASK@ | |
139 | _GL_FUNCDECL_SYS (pthread_sigmask, int, | |
140 | (int how, const sigset_t *new_mask, sigset_t *old_mask)); | |
141 | # endif | |
142 | _GL_CXXALIAS_SYS (pthread_sigmask, int, | |
143 | (int how, const sigset_t *new_mask, sigset_t *old_mask)); | |
6db30f83 | 144 | # endif |
2a84b02d | 145 | _GL_CXXALIASWARN (pthread_sigmask); |
6db30f83 PE |
146 | #elif defined GNULIB_POSIXCHECK |
147 | # undef pthread_sigmask | |
148 | # if HAVE_RAW_DECL_PTHREAD_SIGMASK | |
149 | _GL_WARN_ON_USE (pthread_sigmask, "pthread_sigmask is not portable - " | |
150 | "use gnulib module pthread_sigmask for portability"); | |
151 | # endif | |
152 | #endif | |
153 | ||
154 | ||
316f8af0 PE |
155 | #if @GNULIB_RAISE@ |
156 | # if @REPLACE_RAISE@ | |
157 | # if !(defined __cplusplus && defined GNULIB_NAMESPACE) | |
158 | # undef raise | |
159 | # define raise rpl_raise | |
160 | # endif | |
161 | _GL_FUNCDECL_RPL (raise, int, (int sig)); | |
162 | _GL_CXXALIAS_RPL (raise, int, (int sig)); | |
163 | # else | |
164 | # if !@HAVE_RAISE@ | |
165 | _GL_FUNCDECL_SYS (raise, int, (int sig)); | |
166 | # endif | |
167 | _GL_CXXALIAS_SYS (raise, int, (int sig)); | |
168 | # endif | |
169 | _GL_CXXALIASWARN (raise); | |
170 | #elif defined GNULIB_POSIXCHECK | |
171 | # undef raise | |
172 | /* Assume raise is always declared. */ | |
173 | _GL_WARN_ON_USE (raise, "raise can crash on native Windows - " | |
174 | "use gnulib module raise for portability"); | |
175 | #endif | |
176 | ||
177 | ||
6db30f83 PE |
178 | #if @GNULIB_SIGPROCMASK@ |
179 | # if !@HAVE_POSIX_SIGNALBLOCKING@ | |
180 | ||
d47439a3 PE |
181 | # ifndef GNULIB_defined_signal_blocking |
182 | # define GNULIB_defined_signal_blocking 1 | |
183 | # endif | |
184 | ||
6db30f83 PE |
185 | /* Maximum signal number + 1. */ |
186 | # ifndef NSIG | |
187 | # define NSIG 32 | |
188 | # endif | |
189 | ||
190 | /* This code supports only 32 signals. */ | |
191 | # if !GNULIB_defined_verify_NSIG_constraint | |
192 | typedef int verify_NSIG_constraint[NSIG <= 32 ? 1 : -1]; | |
193 | # define GNULIB_defined_verify_NSIG_constraint 1 | |
194 | # endif | |
195 | ||
196 | # endif | |
197 | ||
198 | /* Test whether a given signal is contained in a signal set. */ | |
199 | # if @HAVE_POSIX_SIGNALBLOCKING@ | |
200 | /* This function is defined as a macro on MacOS X. */ | |
201 | # if defined __cplusplus && defined GNULIB_NAMESPACE | |
202 | # undef sigismember | |
203 | # endif | |
204 | # else | |
205 | _GL_FUNCDECL_SYS (sigismember, int, (const sigset_t *set, int sig) | |
206 | _GL_ARG_NONNULL ((1))); | |
207 | # endif | |
208 | _GL_CXXALIAS_SYS (sigismember, int, (const sigset_t *set, int sig)); | |
209 | _GL_CXXALIASWARN (sigismember); | |
210 | ||
211 | /* Initialize a signal set to the empty set. */ | |
212 | # if @HAVE_POSIX_SIGNALBLOCKING@ | |
213 | /* This function is defined as a macro on MacOS X. */ | |
214 | # if defined __cplusplus && defined GNULIB_NAMESPACE | |
215 | # undef sigemptyset | |
216 | # endif | |
217 | # else | |
218 | _GL_FUNCDECL_SYS (sigemptyset, int, (sigset_t *set) _GL_ARG_NONNULL ((1))); | |
219 | # endif | |
220 | _GL_CXXALIAS_SYS (sigemptyset, int, (sigset_t *set)); | |
221 | _GL_CXXALIASWARN (sigemptyset); | |
222 | ||
223 | /* Add a signal to a signal set. */ | |
224 | # if @HAVE_POSIX_SIGNALBLOCKING@ | |
225 | /* This function is defined as a macro on MacOS X. */ | |
226 | # if defined __cplusplus && defined GNULIB_NAMESPACE | |
227 | # undef sigaddset | |
228 | # endif | |
229 | # else | |
230 | _GL_FUNCDECL_SYS (sigaddset, int, (sigset_t *set, int sig) | |
231 | _GL_ARG_NONNULL ((1))); | |
232 | # endif | |
233 | _GL_CXXALIAS_SYS (sigaddset, int, (sigset_t *set, int sig)); | |
234 | _GL_CXXALIASWARN (sigaddset); | |
235 | ||
236 | /* Remove a signal from a signal set. */ | |
237 | # if @HAVE_POSIX_SIGNALBLOCKING@ | |
238 | /* This function is defined as a macro on MacOS X. */ | |
239 | # if defined __cplusplus && defined GNULIB_NAMESPACE | |
240 | # undef sigdelset | |
241 | # endif | |
242 | # else | |
243 | _GL_FUNCDECL_SYS (sigdelset, int, (sigset_t *set, int sig) | |
244 | _GL_ARG_NONNULL ((1))); | |
245 | # endif | |
246 | _GL_CXXALIAS_SYS (sigdelset, int, (sigset_t *set, int sig)); | |
247 | _GL_CXXALIASWARN (sigdelset); | |
248 | ||
249 | /* Fill a signal set with all possible signals. */ | |
250 | # if @HAVE_POSIX_SIGNALBLOCKING@ | |
251 | /* This function is defined as a macro on MacOS X. */ | |
252 | # if defined __cplusplus && defined GNULIB_NAMESPACE | |
253 | # undef sigfillset | |
254 | # endif | |
255 | # else | |
256 | _GL_FUNCDECL_SYS (sigfillset, int, (sigset_t *set) _GL_ARG_NONNULL ((1))); | |
257 | # endif | |
258 | _GL_CXXALIAS_SYS (sigfillset, int, (sigset_t *set)); | |
259 | _GL_CXXALIASWARN (sigfillset); | |
260 | ||
261 | /* Return the set of those blocked signals that are pending. */ | |
262 | # if !@HAVE_POSIX_SIGNALBLOCKING@ | |
263 | _GL_FUNCDECL_SYS (sigpending, int, (sigset_t *set) _GL_ARG_NONNULL ((1))); | |
264 | # endif | |
265 | _GL_CXXALIAS_SYS (sigpending, int, (sigset_t *set)); | |
266 | _GL_CXXALIASWARN (sigpending); | |
267 | ||
268 | /* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET. | |
269 | Then, if SET is not NULL, affect the current set of blocked signals by | |
270 | combining it with *SET as indicated in OPERATION. | |
271 | In this implementation, you are not allowed to change a signal handler | |
272 | while the signal is blocked. */ | |
273 | # if !@HAVE_POSIX_SIGNALBLOCKING@ | |
274 | # define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */ | |
275 | # define SIG_SETMASK 1 /* blocked_set = *set; */ | |
276 | # define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */ | |
277 | _GL_FUNCDECL_SYS (sigprocmask, int, | |
278 | (int operation, const sigset_t *set, sigset_t *old_set)); | |
279 | # endif | |
280 | _GL_CXXALIAS_SYS (sigprocmask, int, | |
281 | (int operation, const sigset_t *set, sigset_t *old_set)); | |
282 | _GL_CXXALIASWARN (sigprocmask); | |
283 | ||
284 | /* Install the handler FUNC for signal SIG, and return the previous | |
285 | handler. */ | |
286 | # ifdef __cplusplus | |
287 | extern "C" { | |
288 | # endif | |
289 | # if !GNULIB_defined_function_taking_int_returning_void_t | |
290 | typedef void (*_gl_function_taking_int_returning_void_t) (int); | |
291 | # define GNULIB_defined_function_taking_int_returning_void_t 1 | |
292 | # endif | |
293 | # ifdef __cplusplus | |
294 | } | |
295 | # endif | |
296 | # if !@HAVE_POSIX_SIGNALBLOCKING@ | |
297 | # if !(defined __cplusplus && defined GNULIB_NAMESPACE) | |
298 | # define signal rpl_signal | |
299 | # endif | |
300 | _GL_FUNCDECL_RPL (signal, _gl_function_taking_int_returning_void_t, | |
301 | (int sig, _gl_function_taking_int_returning_void_t func)); | |
302 | _GL_CXXALIAS_RPL (signal, _gl_function_taking_int_returning_void_t, | |
303 | (int sig, _gl_function_taking_int_returning_void_t func)); | |
304 | # else | |
305 | _GL_CXXALIAS_SYS (signal, _gl_function_taking_int_returning_void_t, | |
306 | (int sig, _gl_function_taking_int_returning_void_t func)); | |
307 | # endif | |
308 | _GL_CXXALIASWARN (signal); | |
309 | ||
6db30f83 | 310 | # if !@HAVE_POSIX_SIGNALBLOCKING@ && GNULIB_defined_SIGPIPE |
d47439a3 PE |
311 | /* Raise signal SIGPIPE. */ |
312 | _GL_EXTERN_C int _gl_raise_SIGPIPE (void); | |
6db30f83 | 313 | # endif |
6db30f83 PE |
314 | |
315 | #elif defined GNULIB_POSIXCHECK | |
316 | # undef sigaddset | |
317 | # if HAVE_RAW_DECL_SIGADDSET | |
318 | _GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - " | |
319 | "use the gnulib module sigprocmask for portability"); | |
320 | # endif | |
321 | # undef sigdelset | |
322 | # if HAVE_RAW_DECL_SIGDELSET | |
323 | _GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - " | |
324 | "use the gnulib module sigprocmask for portability"); | |
325 | # endif | |
326 | # undef sigemptyset | |
327 | # if HAVE_RAW_DECL_SIGEMPTYSET | |
328 | _GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - " | |
329 | "use the gnulib module sigprocmask for portability"); | |
330 | # endif | |
331 | # undef sigfillset | |
332 | # if HAVE_RAW_DECL_SIGFILLSET | |
333 | _GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - " | |
334 | "use the gnulib module sigprocmask for portability"); | |
335 | # endif | |
336 | # undef sigismember | |
337 | # if HAVE_RAW_DECL_SIGISMEMBER | |
338 | _GL_WARN_ON_USE (sigismember, "sigismember is unportable - " | |
339 | "use the gnulib module sigprocmask for portability"); | |
340 | # endif | |
341 | # undef sigpending | |
342 | # if HAVE_RAW_DECL_SIGPENDING | |
343 | _GL_WARN_ON_USE (sigpending, "sigpending is unportable - " | |
344 | "use the gnulib module sigprocmask for portability"); | |
345 | # endif | |
346 | # undef sigprocmask | |
347 | # if HAVE_RAW_DECL_SIGPROCMASK | |
348 | _GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - " | |
349 | "use the gnulib module sigprocmask for portability"); | |
350 | # endif | |
351 | #endif /* @GNULIB_SIGPROCMASK@ */ | |
352 | ||
353 | ||
354 | #if @GNULIB_SIGACTION@ | |
355 | # if !@HAVE_SIGACTION@ | |
356 | ||
357 | # if !@HAVE_SIGINFO_T@ | |
358 | ||
359 | # if !GNULIB_defined_siginfo_types | |
360 | ||
361 | /* Present to allow compilation, but unsupported by gnulib. */ | |
362 | union sigval | |
363 | { | |
364 | int sival_int; | |
365 | void *sival_ptr; | |
366 | }; | |
367 | ||
368 | /* Present to allow compilation, but unsupported by gnulib. */ | |
369 | struct siginfo_t | |
370 | { | |
371 | int si_signo; | |
372 | int si_code; | |
373 | int si_errno; | |
374 | pid_t si_pid; | |
375 | uid_t si_uid; | |
376 | void *si_addr; | |
377 | int si_status; | |
378 | long si_band; | |
379 | union sigval si_value; | |
380 | }; | |
381 | typedef struct siginfo_t siginfo_t; | |
382 | ||
383 | # define GNULIB_defined_siginfo_types 1 | |
384 | # endif | |
385 | ||
386 | # endif /* !@HAVE_SIGINFO_T@ */ | |
387 | ||
388 | /* We assume that platforms which lack the sigaction() function also lack | |
389 | the 'struct sigaction' type, and vice versa. */ | |
390 | ||
391 | # if !GNULIB_defined_struct_sigaction | |
392 | ||
393 | struct sigaction | |
394 | { | |
395 | union | |
396 | { | |
397 | void (*_sa_handler) (int); | |
398 | /* Present to allow compilation, but unsupported by gnulib. POSIX | |
399 | says that implementations may, but not must, make sa_sigaction | |
400 | overlap with sa_handler, but we know of no implementation where | |
401 | they do not overlap. */ | |
402 | void (*_sa_sigaction) (int, siginfo_t *, void *); | |
403 | } _sa_func; | |
404 | sigset_t sa_mask; | |
405 | /* Not all POSIX flags are supported. */ | |
406 | int sa_flags; | |
407 | }; | |
408 | # define sa_handler _sa_func._sa_handler | |
409 | # define sa_sigaction _sa_func._sa_sigaction | |
410 | /* Unsupported flags are not present. */ | |
411 | # define SA_RESETHAND 1 | |
412 | # define SA_NODEFER 2 | |
413 | # define SA_RESTART 4 | |
414 | ||
415 | # define GNULIB_defined_struct_sigaction 1 | |
416 | # endif | |
417 | ||
418 | _GL_FUNCDECL_SYS (sigaction, int, (int, const struct sigaction *restrict, | |
419 | struct sigaction *restrict)); | |
420 | ||
421 | # elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ | |
422 | ||
423 | # define sa_sigaction sa_handler | |
424 | ||
425 | # endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */ | |
426 | ||
427 | _GL_CXXALIAS_SYS (sigaction, int, (int, const struct sigaction *restrict, | |
428 | struct sigaction *restrict)); | |
429 | _GL_CXXALIASWARN (sigaction); | |
430 | ||
431 | #elif defined GNULIB_POSIXCHECK | |
432 | # undef sigaction | |
433 | # if HAVE_RAW_DECL_SIGACTION | |
434 | _GL_WARN_ON_USE (sigaction, "sigaction is unportable - " | |
435 | "use the gnulib module sigaction for portability"); | |
436 | # endif | |
437 | #endif | |
438 | ||
439 | /* Some systems don't have SA_NODEFER. */ | |
440 | #ifndef SA_NODEFER | |
441 | # define SA_NODEFER 0 | |
442 | #endif | |
443 | ||
444 | ||
445 | #endif /* _@GUARD_PREFIX@_SIGNAL_H */ | |
446 | #endif /* _@GUARD_PREFIX@_SIGNAL_H */ | |
447 | #endif |