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. */
33 /* The include_next requires a split double-inclusion guard. */
34 #@INCLUDE_NEXT@ @NEXT_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 typedef int rpl_sig_atomic_t;
55 # define sig_atomic_t rpl_sig_atomic_t
58 /* A set or mask of signals. */
60 typedef unsigned int sigset_t;
64 #if @GNULIB_SIGNAL_H_SIGPIPE@
66 /* Define SIGPIPE to a value that does not overlap with other signals. */
68 # define GNULIB_defined_SIGPIPE 1
69 /* To actually use SIGPIPE, you also need the gnulib modules 'sigprocmask',
75 /* Maximum signal number + 1. */
83 #if @GNULIB_SIGPROCMASK@
84 # if !@HAVE_POSIX_SIGNALBLOCKING@
86 /* Maximum signal number + 1. */
91 /* This code supports only 32 signals. */
92 typedef int verify_NSIG_constraint[NSIG <= 32 ? 1 : -1];
96 /* Test whether a given signal is contained in a signal set. */
97 # if @HAVE_POSIX_SIGNALBLOCKING@
98 /* This function is defined as a macro on MacOS X. */
99 # if defined __cplusplus && defined GNULIB_NAMESPACE
103 _GL_FUNCDECL_SYS (sigismember, int, (const sigset_t *set, int sig)
104 _GL_ARG_NONNULL ((1)));
106 _GL_CXXALIAS_SYS (sigismember, int, (const sigset_t *set, int sig));
107 _GL_CXXALIASWARN (sigismember);
109 /* Initialize a signal set to the empty set. */
110 # if @HAVE_POSIX_SIGNALBLOCKING@
111 /* This function is defined as a macro on MacOS X. */
112 # if defined __cplusplus && defined GNULIB_NAMESPACE
116 _GL_FUNCDECL_SYS (sigemptyset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
118 _GL_CXXALIAS_SYS (sigemptyset, int, (sigset_t *set));
119 _GL_CXXALIASWARN (sigemptyset);
121 /* Add a signal to a signal set. */
122 # if @HAVE_POSIX_SIGNALBLOCKING@
123 /* This function is defined as a macro on MacOS X. */
124 # if defined __cplusplus && defined GNULIB_NAMESPACE
128 _GL_FUNCDECL_SYS (sigaddset, int, (sigset_t *set, int sig)
129 _GL_ARG_NONNULL ((1)));
131 _GL_CXXALIAS_SYS (sigaddset, int, (sigset_t *set, int sig));
132 _GL_CXXALIASWARN (sigaddset);
134 /* Remove a signal from a signal set. */
135 # if @HAVE_POSIX_SIGNALBLOCKING@
136 /* This function is defined as a macro on MacOS X. */
137 # if defined __cplusplus && defined GNULIB_NAMESPACE
141 _GL_FUNCDECL_SYS (sigdelset, int, (sigset_t *set, int sig)
142 _GL_ARG_NONNULL ((1)));
144 _GL_CXXALIAS_SYS (sigdelset, int, (sigset_t *set, int sig));
145 _GL_CXXALIASWARN (sigdelset);
147 /* Fill a signal set with all possible signals. */
148 # if @HAVE_POSIX_SIGNALBLOCKING@
149 /* This function is defined as a macro on MacOS X. */
150 # if defined __cplusplus && defined GNULIB_NAMESPACE
154 _GL_FUNCDECL_SYS (sigfillset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
156 _GL_CXXALIAS_SYS (sigfillset, int, (sigset_t *set));
157 _GL_CXXALIASWARN (sigfillset);
159 /* Return the set of those blocked signals that are pending. */
160 # if !@HAVE_POSIX_SIGNALBLOCKING@
161 _GL_FUNCDECL_SYS (sigpending, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
163 _GL_CXXALIAS_SYS (sigpending, int, (sigset_t *set));
164 _GL_CXXALIASWARN (sigpending);
166 /* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
167 Then, if SET is not NULL, affect the current set of blocked signals by
168 combining it with *SET as indicated in OPERATION.
169 In this implementation, you are not allowed to change a signal handler
170 while the signal is blocked. */
171 # if !@HAVE_POSIX_SIGNALBLOCKING@
172 # define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
173 # define SIG_SETMASK 1 /* blocked_set = *set; */
174 # define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
175 _GL_FUNCDECL_SYS (sigprocmask, int,
176 (int operation, const sigset_t *set, sigset_t *old_set));
178 _GL_CXXALIAS_SYS (sigprocmask, int,
179 (int operation, const sigset_t *set, sigset_t *old_set));
180 _GL_CXXALIASWARN (sigprocmask);
182 /* Install the handler FUNC for signal SIG, and return the previous
187 typedef void (*_gl_function_taking_int_returning_void_t) (int);
191 # if !@HAVE_POSIX_SIGNALBLOCKING@
192 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
193 # define signal rpl_signal
195 _GL_FUNCDECL_RPL (signal, _gl_function_taking_int_returning_void_t,
196 (int sig, _gl_function_taking_int_returning_void_t func));
197 _GL_CXXALIAS_RPL (signal, _gl_function_taking_int_returning_void_t,
198 (int sig, _gl_function_taking_int_returning_void_t func));
200 _GL_CXXALIAS_SYS (signal, _gl_function_taking_int_returning_void_t,
201 (int sig, _gl_function_taking_int_returning_void_t func));
203 _GL_CXXALIASWARN (signal);
205 /* Raise signal SIG. */
206 # if !@HAVE_POSIX_SIGNALBLOCKING@ && GNULIB_defined_SIGPIPE
207 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
209 # define raise rpl_raise
211 _GL_FUNCDECL_RPL (raise, int, (int sig));
212 _GL_CXXALIAS_RPL (raise, int, (int sig));
214 _GL_CXXALIAS_SYS (raise, int, (int sig));
216 _GL_CXXALIASWARN (raise);
218 #elif defined GNULIB_POSIXCHECK
220 # if HAVE_RAW_DECL_SIGADDSET
221 _GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - "
222 "use the gnulib module sigprocmask for portability");
225 # if HAVE_RAW_DECL_SIGDELSET
226 _GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - "
227 "use the gnulib module sigprocmask for portability");
230 # if HAVE_RAW_DECL_SIGEMPTYSET
231 _GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - "
232 "use the gnulib module sigprocmask for portability");
235 # if HAVE_RAW_DECL_SIGFILLSET
236 _GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - "
237 "use the gnulib module sigprocmask for portability");
240 # if HAVE_RAW_DECL_SIGISMEMBER
241 _GL_WARN_ON_USE (sigismember, "sigismember is unportable - "
242 "use the gnulib module sigprocmask for portability");
245 # if HAVE_RAW_DECL_SIGPENDING
246 _GL_WARN_ON_USE (sigpending, "sigpending is unportable - "
247 "use the gnulib module sigprocmask for portability");
250 # if HAVE_RAW_DECL_SIGPROCMASK
251 _GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - "
252 "use the gnulib module sigprocmask for portability");
254 #endif /* @GNULIB_SIGPROCMASK@ */
257 #if @GNULIB_SIGACTION@
258 # if !@HAVE_SIGACTION@
260 # if !@HAVE_SIGINFO_T@
261 /* Present to allow compilation, but unsupported by gnulib. */
268 /* Present to allow compilation, but unsupported by gnulib. */
279 union sigval si_value;
281 typedef struct siginfo_t siginfo_t;
282 # endif /* !@HAVE_SIGINFO_T@ */
284 /* We assume that platforms which lack the sigaction() function also lack
285 the 'struct sigaction' type, and vice versa. */
291 void (*_sa_handler) (int);
292 /* Present to allow compilation, but unsupported by gnulib. POSIX
293 says that implementations may, but not must, make sa_sigaction
294 overlap with sa_handler, but we know of no implementation where
295 they do not overlap. */
296 void (*_sa_sigaction) (int, siginfo_t *, void *);
299 /* Not all POSIX flags are supported. */
302 # define sa_handler _sa_func._sa_handler
303 # define sa_sigaction _sa_func._sa_sigaction
304 /* Unsupported flags are not present. */
305 # define SA_RESETHAND 1
306 # define SA_NODEFER 2
307 # define SA_RESTART 4
309 _GL_FUNCDECL_SYS (sigaction, int, (int, const struct sigaction *restrict,
310 struct sigaction *restrict));
312 # elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@
314 # define sa_sigaction sa_handler
316 # endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */
318 _GL_CXXALIAS_SYS (sigaction, int, (int, const struct sigaction *restrict,
319 struct sigaction *restrict));
320 _GL_CXXALIASWARN (sigaction);
322 #elif defined GNULIB_POSIXCHECK
324 # if HAVE_RAW_DECL_SIGACTION
325 _GL_WARN_ON_USE (sigaction, "sigaction is unportable - "
326 "use the gnulib module sigaction for portability");
330 /* Some systems don't have SA_NODEFER. */
332 # define SA_NODEFER 0
336 #endif /* _GL_SIGNAL_H */
337 #endif /* _GL_SIGNAL_H */