1 /* A GNU-like <signal.h>.
3 Copyright (C) 2006-2010 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@
22 #if defined __need_sig_atomic_t || defined __need_sigset_t
23 /* Special invocation convention inside glibc header files. */
25 # @INCLUDE_NEXT@ @NEXT_SIGNAL_H@
28 /* Normal invocation convention. */
32 /* The include_next requires a split double-inclusion guard. */
33 #@INCLUDE_NEXT@ @NEXT_SIGNAL_H@
38 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */
40 /* The definition of _GL_ARG_NONNULL is copied here. */
42 /* The definition of _GL_WARN_ON_USE is copied here. */
44 /* Define pid_t, uid_t.
45 Also, mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
46 #include <sys/types.h>
48 /* On AIX, sig_atomic_t already includes volatile. C99 requires that
49 'volatile sig_atomic_t' ignore the extra modifier, but C89 did not.
50 Hence, redefine this to a non-volatile type as needed. */
51 #if ! @HAVE_TYPE_VOLATILE_SIG_ATOMIC_T@
52 typedef int rpl_sig_atomic_t;
54 # define sig_atomic_t rpl_sig_atomic_t
57 /* A set or mask of signals. */
59 typedef unsigned int sigset_t;
63 #if @GNULIB_SIGNAL_H_SIGPIPE@
65 /* Define SIGPIPE to a value that does not overlap with other signals. */
67 # define GNULIB_defined_SIGPIPE 1
68 /* To actually use SIGPIPE, you also need the gnulib modules 'sigprocmask',
74 #if @GNULIB_SIGPROCMASK@
75 # if !@HAVE_POSIX_SIGNALBLOCKING@
77 /* Maximum signal number + 1. */
82 /* This code supports only 32 signals. */
83 typedef int verify_NSIG_constraint[2 * (NSIG <= 32) - 1];
87 /* Test whether a given signal is contained in a signal set. */
88 # if @HAVE_POSIX_SIGNALBLOCKING@
89 /* This function is defined as a macro on MacOS X. */
90 # if defined __cplusplus && defined GNULIB_NAMESPACE
94 _GL_FUNCDECL_SYS (sigismember, int, (const sigset_t *set, int sig)
95 _GL_ARG_NONNULL ((1)));
97 _GL_CXXALIAS_SYS (sigismember, int, (const sigset_t *set, int sig));
98 _GL_CXXALIASWARN (sigismember);
100 /* Initialize a signal set to the empty set. */
101 # if @HAVE_POSIX_SIGNALBLOCKING@
102 /* This function is defined as a macro on MacOS X. */
103 # if defined __cplusplus && defined GNULIB_NAMESPACE
107 _GL_FUNCDECL_SYS (sigemptyset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
109 _GL_CXXALIAS_SYS (sigemptyset, int, (sigset_t *set));
110 _GL_CXXALIASWARN (sigemptyset);
112 /* Add a signal to a signal set. */
113 # if @HAVE_POSIX_SIGNALBLOCKING@
114 /* This function is defined as a macro on MacOS X. */
115 # if defined __cplusplus && defined GNULIB_NAMESPACE
119 _GL_FUNCDECL_SYS (sigaddset, int, (sigset_t *set, int sig)
120 _GL_ARG_NONNULL ((1)));
122 _GL_CXXALIAS_SYS (sigaddset, int, (sigset_t *set, int sig));
123 _GL_CXXALIASWARN (sigaddset);
125 /* Remove a signal from a signal set. */
126 # if @HAVE_POSIX_SIGNALBLOCKING@
127 /* This function is defined as a macro on MacOS X. */
128 # if defined __cplusplus && defined GNULIB_NAMESPACE
132 _GL_FUNCDECL_SYS (sigdelset, int, (sigset_t *set, int sig)
133 _GL_ARG_NONNULL ((1)));
135 _GL_CXXALIAS_SYS (sigdelset, int, (sigset_t *set, int sig));
136 _GL_CXXALIASWARN (sigdelset);
138 /* Fill a signal set with all possible signals. */
139 # if @HAVE_POSIX_SIGNALBLOCKING@
140 /* This function is defined as a macro on MacOS X. */
141 # if defined __cplusplus && defined GNULIB_NAMESPACE
145 _GL_FUNCDECL_SYS (sigfillset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
147 _GL_CXXALIAS_SYS (sigfillset, int, (sigset_t *set));
148 _GL_CXXALIASWARN (sigfillset);
150 /* Return the set of those blocked signals that are pending. */
151 # if !@HAVE_POSIX_SIGNALBLOCKING@
152 _GL_FUNCDECL_SYS (sigpending, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
154 _GL_CXXALIAS_SYS (sigpending, int, (sigset_t *set));
155 _GL_CXXALIASWARN (sigpending);
157 /* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
158 Then, if SET is not NULL, affect the current set of blocked signals by
159 combining it with *SET as indicated in OPERATION.
160 In this implementation, you are not allowed to change a signal handler
161 while the signal is blocked. */
162 # if !@HAVE_POSIX_SIGNALBLOCKING@
163 # define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
164 # define SIG_SETMASK 1 /* blocked_set = *set; */
165 # define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
166 _GL_FUNCDECL_SYS (sigprocmask, int,
167 (int operation, const sigset_t *set, sigset_t *old_set));
169 _GL_CXXALIAS_SYS (sigprocmask, int,
170 (int operation, const sigset_t *set, sigset_t *old_set));
171 _GL_CXXALIASWARN (sigprocmask);
173 /* Install the handler FUNC for signal SIG, and return the previous
178 typedef void (*_gl_function_taking_int_returning_void_t) (int);
182 # if !@HAVE_POSIX_SIGNALBLOCKING@
183 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
184 # define signal rpl_signal
186 _GL_FUNCDECL_RPL (signal, _gl_function_taking_int_returning_void_t,
187 (int sig, _gl_function_taking_int_returning_void_t func));
188 _GL_CXXALIAS_RPL (signal, _gl_function_taking_int_returning_void_t,
189 (int sig, _gl_function_taking_int_returning_void_t func));
191 _GL_CXXALIAS_SYS (signal, _gl_function_taking_int_returning_void_t,
192 (int sig, _gl_function_taking_int_returning_void_t func));
194 _GL_CXXALIASWARN (signal);
196 /* Raise signal SIG. */
197 # if !@HAVE_POSIX_SIGNALBLOCKING@ && GNULIB_defined_SIGPIPE
198 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
200 # define raise rpl_raise
202 _GL_FUNCDECL_RPL (raise, int, (int sig));
203 _GL_CXXALIAS_RPL (raise, int, (int sig));
205 _GL_CXXALIAS_SYS (raise, int, (int sig));
207 _GL_CXXALIASWARN (raise);
209 #elif defined GNULIB_POSIXCHECK
211 # if HAVE_RAW_DECL_SIGADDSET
212 _GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - "
213 "use the gnulib module sigprocmask for portability");
216 # if HAVE_RAW_DECL_SIGDELSET
217 _GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - "
218 "use the gnulib module sigprocmask for portability");
221 # if HAVE_RAW_DECL_SIGEMPTYSET
222 _GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - "
223 "use the gnulib module sigprocmask for portability");
226 # if HAVE_RAW_DECL_SIGFILLSET
227 _GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - "
228 "use the gnulib module sigprocmask for portability");
231 # if HAVE_RAW_DECL_SIGISMEMBER
232 _GL_WARN_ON_USE (sigismember, "sigismember is unportable - "
233 "use the gnulib module sigprocmask for portability");
236 # if HAVE_RAW_DECL_SIGPENDING
237 _GL_WARN_ON_USE (sigpending, "sigpending is unportable - "
238 "use the gnulib module sigprocmask for portability");
241 # if HAVE_RAW_DECL_SIGPROCMASK
242 _GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - "
243 "use the gnulib module sigprocmask for portability");
245 #endif /* @GNULIB_SIGPROCMASK@ */
248 #if @GNULIB_SIGACTION@
249 # if !@HAVE_SIGACTION@
251 # if !@HAVE_SIGINFO_T@
252 /* Present to allow compilation, but unsupported by gnulib. */
259 /* Present to allow compilation, but unsupported by gnulib. */
270 union sigval si_value;
272 typedef struct siginfo_t siginfo_t;
273 # endif /* !@HAVE_SIGINFO_T@ */
275 /* We assume that platforms which lack the sigaction() function also lack
276 the 'struct sigaction' type, and vice versa. */
282 void (*_sa_handler) (int);
283 /* Present to allow compilation, but unsupported by gnulib. POSIX
284 says that implementations may, but not must, make sa_sigaction
285 overlap with sa_handler, but we know of no implementation where
286 they do not overlap. */
287 void (*_sa_sigaction) (int, siginfo_t *, void *);
290 /* Not all POSIX flags are supported. */
293 # define sa_handler _sa_func._sa_handler
294 # define sa_sigaction _sa_func._sa_sigaction
295 /* Unsupported flags are not present. */
296 # define SA_RESETHAND 1
297 # define SA_NODEFER 2
298 # define SA_RESTART 4
300 _GL_FUNCDECL_SYS (sigaction, int, (int, const struct sigaction *restrict,
301 struct sigaction *restrict));
303 # elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@
305 # define sa_sigaction sa_handler
307 # endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */
309 _GL_CXXALIAS_SYS (sigaction, int, (int, const struct sigaction *restrict,
310 struct sigaction *restrict));
311 _GL_CXXALIASWARN (sigaction);
313 #elif defined GNULIB_POSIXCHECK
315 # if HAVE_RAW_DECL_SIGACTION
316 _GL_WARN_ON_USE (sigaction, "sigaction is unportable - "
317 "use the gnulib module sigaction for portability");
321 /* Some systems don't have SA_NODEFER. */
323 # define SA_NODEFER 0
327 #endif /* _GL_SIGNAL_H */
328 #endif /* _GL_SIGNAL_H */