1 /* A GNU-like <signal.h>.
3 Copyright (C) 2006-2011 Free Software Foundation, Inc.
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.
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.
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/>. */
19 @PRAGMA_SYSTEM_HEADER@
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. */
35 # @INCLUDE_NEXT@ @NEXT_SIGNAL_H@
38 /* Normal invocation convention. */
40 #ifndef _@GUARD_PREFIX@_SIGNAL_H
42 #define _GL_ALREADY_INCLUDING_SIGNAL_H
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>
50 /* The include_next requires a split double-inclusion guard. */
51 #@INCLUDE_NEXT@ @NEXT_SIGNAL_H@
53 #undef _GL_ALREADY_INCLUDING_SIGNAL_H
55 #ifndef _@GUARD_PREFIX@_SIGNAL_H
56 #define _@GUARD_PREFIX@_SIGNAL_H
58 /* MacOS X 10.3, FreeBSD 6.4, OpenBSD 3.8, OSF/1 4.0 declare pthread_sigmask in
59 <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__) \
63 && ! defined __GLIBC__
67 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */
69 /* The definition of _GL_ARG_NONNULL is copied here. */
71 /* The definition of _GL_WARN_ON_USE is copied here. */
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;
80 # define sig_atomic_t rpl_sig_atomic_t
81 # define GNULIB_defined_sig_atomic_t 1
85 /* A set or mask of signals. */
87 # if !GNULIB_defined_sigset_t
88 typedef unsigned int sigset_t;
89 # define GNULIB_defined_sigset_t 1
93 /* Define sighandler_t, the type of signal handlers. A GNU extension. */
94 #if !@HAVE_SIGHANDLER_T@
98 # if !GNULIB_defined_sighandler_t
99 typedef void (*sighandler_t) (int);
100 # define GNULIB_defined_sighandler_t 1
108 #if @GNULIB_SIGNAL_H_SIGPIPE@
110 /* Define SIGPIPE to a value that does not overlap with other signals. */
112 # define GNULIB_defined_SIGPIPE 1
113 /* To actually use SIGPIPE, you also need the gnulib modules 'sigprocmask',
119 /* Maximum signal number + 1. */
121 # if defined __TANDEM
127 #if @GNULIB_PTHREAD_SIGMASK@
128 # if !@HAVE_PTHREAD_SIGMASK@
129 _GL_FUNCDECL_SYS (pthread_sigmask, int,
130 (int how, const sigset_t *new_mask, sigset_t *old_mask));
132 _GL_CXXALIAS_SYS (pthread_sigmask, int,
133 (int how, const sigset_t *new_mask, sigset_t *old_mask));
134 _GL_CXXALIASWARN (pthread_sigmask);
135 #elif defined GNULIB_POSIXCHECK
136 # undef pthread_sigmask
137 # if HAVE_RAW_DECL_PTHREAD_SIGMASK
138 _GL_WARN_ON_USE (pthread_sigmask, "pthread_sigmask is not portable - "
139 "use gnulib module pthread_sigmask for portability");
144 #if @GNULIB_SIGPROCMASK@
145 # if !@HAVE_POSIX_SIGNALBLOCKING@
147 /* Maximum signal number + 1. */
152 /* This code supports only 32 signals. */
153 # if !GNULIB_defined_verify_NSIG_constraint
154 typedef int verify_NSIG_constraint[NSIG <= 32 ? 1 : -1];
155 # define GNULIB_defined_verify_NSIG_constraint 1
160 /* Test whether a given signal is contained in a signal set. */
161 # if @HAVE_POSIX_SIGNALBLOCKING@
162 /* This function is defined as a macro on MacOS X. */
163 # if defined __cplusplus && defined GNULIB_NAMESPACE
167 _GL_FUNCDECL_SYS (sigismember, int, (const sigset_t *set, int sig)
168 _GL_ARG_NONNULL ((1)));
170 _GL_CXXALIAS_SYS (sigismember, int, (const sigset_t *set, int sig));
171 _GL_CXXALIASWARN (sigismember);
173 /* Initialize a signal set to the empty set. */
174 # if @HAVE_POSIX_SIGNALBLOCKING@
175 /* This function is defined as a macro on MacOS X. */
176 # if defined __cplusplus && defined GNULIB_NAMESPACE
180 _GL_FUNCDECL_SYS (sigemptyset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
182 _GL_CXXALIAS_SYS (sigemptyset, int, (sigset_t *set));
183 _GL_CXXALIASWARN (sigemptyset);
185 /* Add a signal to a signal set. */
186 # if @HAVE_POSIX_SIGNALBLOCKING@
187 /* This function is defined as a macro on MacOS X. */
188 # if defined __cplusplus && defined GNULIB_NAMESPACE
192 _GL_FUNCDECL_SYS (sigaddset, int, (sigset_t *set, int sig)
193 _GL_ARG_NONNULL ((1)));
195 _GL_CXXALIAS_SYS (sigaddset, int, (sigset_t *set, int sig));
196 _GL_CXXALIASWARN (sigaddset);
198 /* Remove a signal from 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
205 _GL_FUNCDECL_SYS (sigdelset, int, (sigset_t *set, int sig)
206 _GL_ARG_NONNULL ((1)));
208 _GL_CXXALIAS_SYS (sigdelset, int, (sigset_t *set, int sig));
209 _GL_CXXALIASWARN (sigdelset);
211 /* Fill a signal set with all possible signals. */
212 # if @HAVE_POSIX_SIGNALBLOCKING@
213 /* This function is defined as a macro on MacOS X. */
214 # if defined __cplusplus && defined GNULIB_NAMESPACE
218 _GL_FUNCDECL_SYS (sigfillset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
220 _GL_CXXALIAS_SYS (sigfillset, int, (sigset_t *set));
221 _GL_CXXALIASWARN (sigfillset);
223 /* Return the set of those blocked signals that are pending. */
224 # if !@HAVE_POSIX_SIGNALBLOCKING@
225 _GL_FUNCDECL_SYS (sigpending, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
227 _GL_CXXALIAS_SYS (sigpending, int, (sigset_t *set));
228 _GL_CXXALIASWARN (sigpending);
230 /* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
231 Then, if SET is not NULL, affect the current set of blocked signals by
232 combining it with *SET as indicated in OPERATION.
233 In this implementation, you are not allowed to change a signal handler
234 while the signal is blocked. */
235 # if !@HAVE_POSIX_SIGNALBLOCKING@
236 # define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
237 # define SIG_SETMASK 1 /* blocked_set = *set; */
238 # define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
239 _GL_FUNCDECL_SYS (sigprocmask, int,
240 (int operation, const sigset_t *set, sigset_t *old_set));
242 _GL_CXXALIAS_SYS (sigprocmask, int,
243 (int operation, const sigset_t *set, sigset_t *old_set));
244 _GL_CXXALIASWARN (sigprocmask);
246 /* Install the handler FUNC for signal SIG, and return the previous
251 # if !GNULIB_defined_function_taking_int_returning_void_t
252 typedef void (*_gl_function_taking_int_returning_void_t) (int);
253 # define GNULIB_defined_function_taking_int_returning_void_t 1
258 # if !@HAVE_POSIX_SIGNALBLOCKING@
259 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
260 # define signal rpl_signal
262 _GL_FUNCDECL_RPL (signal, _gl_function_taking_int_returning_void_t,
263 (int sig, _gl_function_taking_int_returning_void_t func));
264 _GL_CXXALIAS_RPL (signal, _gl_function_taking_int_returning_void_t,
265 (int sig, _gl_function_taking_int_returning_void_t func));
267 _GL_CXXALIAS_SYS (signal, _gl_function_taking_int_returning_void_t,
268 (int sig, _gl_function_taking_int_returning_void_t func));
270 _GL_CXXALIASWARN (signal);
272 /* Raise signal SIG. */
273 # if !@HAVE_POSIX_SIGNALBLOCKING@ && GNULIB_defined_SIGPIPE
274 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
276 # define raise rpl_raise
278 _GL_FUNCDECL_RPL (raise, int, (int sig));
279 _GL_CXXALIAS_RPL (raise, int, (int sig));
281 _GL_CXXALIAS_SYS (raise, int, (int sig));
283 _GL_CXXALIASWARN (raise);
285 #elif defined GNULIB_POSIXCHECK
287 # if HAVE_RAW_DECL_SIGADDSET
288 _GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - "
289 "use the gnulib module sigprocmask for portability");
292 # if HAVE_RAW_DECL_SIGDELSET
293 _GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - "
294 "use the gnulib module sigprocmask for portability");
297 # if HAVE_RAW_DECL_SIGEMPTYSET
298 _GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - "
299 "use the gnulib module sigprocmask for portability");
302 # if HAVE_RAW_DECL_SIGFILLSET
303 _GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - "
304 "use the gnulib module sigprocmask for portability");
307 # if HAVE_RAW_DECL_SIGISMEMBER
308 _GL_WARN_ON_USE (sigismember, "sigismember is unportable - "
309 "use the gnulib module sigprocmask for portability");
312 # if HAVE_RAW_DECL_SIGPENDING
313 _GL_WARN_ON_USE (sigpending, "sigpending is unportable - "
314 "use the gnulib module sigprocmask for portability");
317 # if HAVE_RAW_DECL_SIGPROCMASK
318 _GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - "
319 "use the gnulib module sigprocmask for portability");
321 #endif /* @GNULIB_SIGPROCMASK@ */
324 #if @GNULIB_SIGACTION@
325 # if !@HAVE_SIGACTION@
327 # if !@HAVE_SIGINFO_T@
329 # if !GNULIB_defined_siginfo_types
331 /* Present to allow compilation, but unsupported by gnulib. */
338 /* Present to allow compilation, but unsupported by gnulib. */
349 union sigval si_value;
351 typedef struct siginfo_t siginfo_t;
353 # define GNULIB_defined_siginfo_types 1
356 # endif /* !@HAVE_SIGINFO_T@ */
358 /* We assume that platforms which lack the sigaction() function also lack
359 the 'struct sigaction' type, and vice versa. */
361 # if !GNULIB_defined_struct_sigaction
367 void (*_sa_handler) (int);
368 /* Present to allow compilation, but unsupported by gnulib. POSIX
369 says that implementations may, but not must, make sa_sigaction
370 overlap with sa_handler, but we know of no implementation where
371 they do not overlap. */
372 void (*_sa_sigaction) (int, siginfo_t *, void *);
375 /* Not all POSIX flags are supported. */
378 # define sa_handler _sa_func._sa_handler
379 # define sa_sigaction _sa_func._sa_sigaction
380 /* Unsupported flags are not present. */
381 # define SA_RESETHAND 1
382 # define SA_NODEFER 2
383 # define SA_RESTART 4
385 # define GNULIB_defined_struct_sigaction 1
388 _GL_FUNCDECL_SYS (sigaction, int, (int, const struct sigaction *restrict,
389 struct sigaction *restrict));
391 # elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@
393 # define sa_sigaction sa_handler
395 # endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */
397 _GL_CXXALIAS_SYS (sigaction, int, (int, const struct sigaction *restrict,
398 struct sigaction *restrict));
399 _GL_CXXALIASWARN (sigaction);
401 #elif defined GNULIB_POSIXCHECK
403 # if HAVE_RAW_DECL_SIGACTION
404 _GL_WARN_ON_USE (sigaction, "sigaction is unportable - "
405 "use the gnulib module sigaction for portability");
409 /* Some systems don't have SA_NODEFER. */
411 # define SA_NODEFER 0
415 #endif /* _@GUARD_PREFIX@_SIGNAL_H */
416 #endif /* _@GUARD_PREFIX@_SIGNAL_H */