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
24 /* Special invocation convention inside glibc header files. */
26 # @INCLUDE_NEXT@ @NEXT_SIGNAL_H@
29 /* Normal invocation convention. */
31 #ifndef _@GUARD_PREFIX@_SIGNAL_H
33 /* The include_next requires a split double-inclusion guard. */
34 #@INCLUDE_NEXT@ @NEXT_SIGNAL_H@
36 #ifndef _@GUARD_PREFIX@_SIGNAL_H
37 #define _@GUARD_PREFIX@_SIGNAL_H
39 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */
41 /* The definition of _GL_ARG_NONNULL is copied here. */
43 /* The definition of _GL_WARN_ON_USE is copied here. */
45 /* Define pid_t, uid_t.
46 Also, mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
47 #include <sys/types.h>
49 /* On AIX, sig_atomic_t already includes volatile. C99 requires that
50 'volatile sig_atomic_t' ignore the extra modifier, but C89 did not.
51 Hence, redefine this to a non-volatile type as needed. */
52 #if ! @HAVE_TYPE_VOLATILE_SIG_ATOMIC_T@
53 # if !GNULIB_defined_sig_atomic_t
54 typedef int rpl_sig_atomic_t;
56 # define sig_atomic_t rpl_sig_atomic_t
57 # define GNULIB_defined_sig_atomic_t 1
61 /* A set or mask of signals. */
63 # if !GNULIB_defined_sigset_t
64 typedef unsigned int sigset_t;
65 # define GNULIB_defined_sigset_t 1
69 /* Define sighandler_t, the type of signal handlers. A GNU extension. */
70 #if !@HAVE_SIGHANDLER_T@
74 # if !GNULIB_defined_sighandler_t
75 typedef void (*sighandler_t) (int);
76 # define GNULIB_defined_sighandler_t 1
84 #if @GNULIB_SIGNAL_H_SIGPIPE@
86 /* Define SIGPIPE to a value that does not overlap with other signals. */
88 # define GNULIB_defined_SIGPIPE 1
89 /* To actually use SIGPIPE, you also need the gnulib modules 'sigprocmask',
95 /* Maximum signal number + 1. */
103 #if @GNULIB_SIGPROCMASK@
104 # if !@HAVE_POSIX_SIGNALBLOCKING@
106 /* Maximum signal number + 1. */
111 /* This code supports only 32 signals. */
112 # if !GNULIB_defined_verify_NSIG_constraint
113 typedef int verify_NSIG_constraint[NSIG <= 32 ? 1 : -1];
114 # define GNULIB_defined_verify_NSIG_constraint 1
119 /* Test whether a given signal is contained in a signal set. */
120 # if @HAVE_POSIX_SIGNALBLOCKING@
121 /* This function is defined as a macro on MacOS X. */
122 # if defined __cplusplus && defined GNULIB_NAMESPACE
126 _GL_FUNCDECL_SYS (sigismember, int, (const sigset_t *set, int sig)
127 _GL_ARG_NONNULL ((1)));
129 _GL_CXXALIAS_SYS (sigismember, int, (const sigset_t *set, int sig));
130 _GL_CXXALIASWARN (sigismember);
132 /* Initialize a signal set to the empty set. */
133 # if @HAVE_POSIX_SIGNALBLOCKING@
134 /* This function is defined as a macro on MacOS X. */
135 # if defined __cplusplus && defined GNULIB_NAMESPACE
139 _GL_FUNCDECL_SYS (sigemptyset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
141 _GL_CXXALIAS_SYS (sigemptyset, int, (sigset_t *set));
142 _GL_CXXALIASWARN (sigemptyset);
144 /* Add a signal to a signal set. */
145 # if @HAVE_POSIX_SIGNALBLOCKING@
146 /* This function is defined as a macro on MacOS X. */
147 # if defined __cplusplus && defined GNULIB_NAMESPACE
151 _GL_FUNCDECL_SYS (sigaddset, int, (sigset_t *set, int sig)
152 _GL_ARG_NONNULL ((1)));
154 _GL_CXXALIAS_SYS (sigaddset, int, (sigset_t *set, int sig));
155 _GL_CXXALIASWARN (sigaddset);
157 /* Remove a signal from a signal set. */
158 # if @HAVE_POSIX_SIGNALBLOCKING@
159 /* This function is defined as a macro on MacOS X. */
160 # if defined __cplusplus && defined GNULIB_NAMESPACE
164 _GL_FUNCDECL_SYS (sigdelset, int, (sigset_t *set, int sig)
165 _GL_ARG_NONNULL ((1)));
167 _GL_CXXALIAS_SYS (sigdelset, int, (sigset_t *set, int sig));
168 _GL_CXXALIASWARN (sigdelset);
170 /* Fill a signal set with all possible signals. */
171 # if @HAVE_POSIX_SIGNALBLOCKING@
172 /* This function is defined as a macro on MacOS X. */
173 # if defined __cplusplus && defined GNULIB_NAMESPACE
177 _GL_FUNCDECL_SYS (sigfillset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
179 _GL_CXXALIAS_SYS (sigfillset, int, (sigset_t *set));
180 _GL_CXXALIASWARN (sigfillset);
182 /* Return the set of those blocked signals that are pending. */
183 # if !@HAVE_POSIX_SIGNALBLOCKING@
184 _GL_FUNCDECL_SYS (sigpending, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
186 _GL_CXXALIAS_SYS (sigpending, int, (sigset_t *set));
187 _GL_CXXALIASWARN (sigpending);
189 /* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
190 Then, if SET is not NULL, affect the current set of blocked signals by
191 combining it with *SET as indicated in OPERATION.
192 In this implementation, you are not allowed to change a signal handler
193 while the signal is blocked. */
194 # if !@HAVE_POSIX_SIGNALBLOCKING@
195 # define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
196 # define SIG_SETMASK 1 /* blocked_set = *set; */
197 # define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
198 _GL_FUNCDECL_SYS (sigprocmask, int,
199 (int operation, const sigset_t *set, sigset_t *old_set));
201 _GL_CXXALIAS_SYS (sigprocmask, int,
202 (int operation, const sigset_t *set, sigset_t *old_set));
203 _GL_CXXALIASWARN (sigprocmask);
205 /* Install the handler FUNC for signal SIG, and return the previous
210 # if !GNULIB_defined_function_taking_int_returning_void_t
211 typedef void (*_gl_function_taking_int_returning_void_t) (int);
212 # define GNULIB_defined_function_taking_int_returning_void_t 1
217 # if !@HAVE_POSIX_SIGNALBLOCKING@
218 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
219 # define signal rpl_signal
221 _GL_FUNCDECL_RPL (signal, _gl_function_taking_int_returning_void_t,
222 (int sig, _gl_function_taking_int_returning_void_t func));
223 _GL_CXXALIAS_RPL (signal, _gl_function_taking_int_returning_void_t,
224 (int sig, _gl_function_taking_int_returning_void_t func));
226 _GL_CXXALIAS_SYS (signal, _gl_function_taking_int_returning_void_t,
227 (int sig, _gl_function_taking_int_returning_void_t func));
229 _GL_CXXALIASWARN (signal);
231 /* Raise signal SIG. */
232 # if !@HAVE_POSIX_SIGNALBLOCKING@ && GNULIB_defined_SIGPIPE
233 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
235 # define raise rpl_raise
237 _GL_FUNCDECL_RPL (raise, int, (int sig));
238 _GL_CXXALIAS_RPL (raise, int, (int sig));
240 _GL_CXXALIAS_SYS (raise, int, (int sig));
242 _GL_CXXALIASWARN (raise);
244 #elif defined GNULIB_POSIXCHECK
246 # if HAVE_RAW_DECL_SIGADDSET
247 _GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - "
248 "use the gnulib module sigprocmask for portability");
251 # if HAVE_RAW_DECL_SIGDELSET
252 _GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - "
253 "use the gnulib module sigprocmask for portability");
256 # if HAVE_RAW_DECL_SIGEMPTYSET
257 _GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - "
258 "use the gnulib module sigprocmask for portability");
261 # if HAVE_RAW_DECL_SIGFILLSET
262 _GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - "
263 "use the gnulib module sigprocmask for portability");
266 # if HAVE_RAW_DECL_SIGISMEMBER
267 _GL_WARN_ON_USE (sigismember, "sigismember is unportable - "
268 "use the gnulib module sigprocmask for portability");
271 # if HAVE_RAW_DECL_SIGPENDING
272 _GL_WARN_ON_USE (sigpending, "sigpending is unportable - "
273 "use the gnulib module sigprocmask for portability");
276 # if HAVE_RAW_DECL_SIGPROCMASK
277 _GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - "
278 "use the gnulib module sigprocmask for portability");
280 #endif /* @GNULIB_SIGPROCMASK@ */
283 #if @GNULIB_SIGACTION@
284 # if !@HAVE_SIGACTION@
286 # if !@HAVE_SIGINFO_T@
288 # if !GNULIB_defined_siginfo_types
290 /* Present to allow compilation, but unsupported by gnulib. */
297 /* Present to allow compilation, but unsupported by gnulib. */
308 union sigval si_value;
310 typedef struct siginfo_t siginfo_t;
312 # define GNULIB_defined_siginfo_types 1
315 # endif /* !@HAVE_SIGINFO_T@ */
317 /* We assume that platforms which lack the sigaction() function also lack
318 the 'struct sigaction' type, and vice versa. */
320 # if !GNULIB_defined_struct_sigaction
326 void (*_sa_handler) (int);
327 /* Present to allow compilation, but unsupported by gnulib. POSIX
328 says that implementations may, but not must, make sa_sigaction
329 overlap with sa_handler, but we know of no implementation where
330 they do not overlap. */
331 void (*_sa_sigaction) (int, siginfo_t *, void *);
334 /* Not all POSIX flags are supported. */
337 # define sa_handler _sa_func._sa_handler
338 # define sa_sigaction _sa_func._sa_sigaction
339 /* Unsupported flags are not present. */
340 # define SA_RESETHAND 1
341 # define SA_NODEFER 2
342 # define SA_RESTART 4
344 # define GNULIB_defined_struct_sigaction 1
347 _GL_FUNCDECL_SYS (sigaction, int, (int, const struct sigaction *restrict,
348 struct sigaction *restrict));
350 # elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@
352 # define sa_sigaction sa_handler
354 # endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */
356 _GL_CXXALIAS_SYS (sigaction, int, (int, const struct sigaction *restrict,
357 struct sigaction *restrict));
358 _GL_CXXALIASWARN (sigaction);
360 #elif defined GNULIB_POSIXCHECK
362 # if HAVE_RAW_DECL_SIGACTION
363 _GL_WARN_ON_USE (sigaction, "sigaction is unportable - "
364 "use the gnulib module sigaction for portability");
368 /* Some systems don't have SA_NODEFER. */
370 # define SA_NODEFER 0
374 #endif /* _@GUARD_PREFIX@_SIGNAL_H */
375 #endif /* _@GUARD_PREFIX@_SIGNAL_H */