1 /* Copyright (C) 1991-2003, 2004, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 * ISO C99 Standard: 7.14 Signal handling <signal.h>
25 #if !defined __need_sig_atomic_t && !defined __need_sigset_t
33 #include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
35 /* An integral type that can be modified atomically, without the
36 possibility of a signal arriving in the middle of the operation. */
37 #if defined __need_sig_atomic_t || defined _SIGNAL_H
38 # ifndef __sig_atomic_t_defined
39 # define __sig_atomic_t_defined
41 typedef __sig_atomic_t sig_atomic_t;
44 # undef __need_sig_atomic_t
47 #if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)
48 # ifndef __sigset_t_defined
49 # define __sigset_t_defined
50 typedef __sigset_t sigset_t;
52 # undef __need_sigset_t
57 #include <bits/types.h>
58 #include <bits/signum.h>
60 #if defined __USE_XOPEN || defined __USE_XOPEN2K
61 # ifndef __pid_t_defined
62 typedef __pid_t pid_t;
63 # define __pid_t_defined
67 # ifndef __uid_t_defined
68 typedef __uid_t uid_t;
69 # define __uid_t_defined
74 /* Type of a signal handler. */
75 typedef void (*__sighandler_t) (int);
77 /* The X/Open definition of `signal' specifies the SVID semantic. Use
78 the additional function `sysv_signal' when X/Open compatibility is
80 extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
83 extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
87 /* Set the handler for the signal SIG to HANDLER, returning the old
88 handler, or SIG_ERR on error.
89 By default `signal' has the BSD semantic. */
92 extern __sighandler_t signal (int __sig, __sighandler_t __handler)
95 /* Make sure the used `signal' implementation is the SVID version. */
96 # ifdef __REDIRECT_NTH
97 extern __sighandler_t __REDIRECT_NTH (signal,
98 (int __sig, __sighandler_t __handler),
101 # define signal __sysv_signal
107 /* The X/Open definition of `signal' conflicts with the BSD version.
108 So they defined another function `bsd_signal'. */
109 extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
113 /* Send signal SIG to process number PID. If PID is zero,
114 send SIG to all processes in the current process's process group.
115 If PID is < -1, send SIG to all processes in process group - PID. */
117 extern int kill (__pid_t __pid, int __sig) __THROW;
118 #endif /* Use POSIX. */
120 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
121 /* Send SIG to all processes in process group PGRP.
122 If PGRP is zero, send SIG to all processes in
123 the current process's process group. */
124 extern int killpg (__pid_t __pgrp, int __sig) __THROW;
125 #endif /* Use BSD || X/Open Unix. */
127 __BEGIN_NAMESPACE_STD
128 /* Raise signal SIG, i.e., send SIG to yourself. */
129 extern int raise (int __sig) __THROW;
133 /* SVID names for the same things. */
134 extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
136 extern int gsignal (int __sig) __THROW;
137 #endif /* Use SVID. */
140 /* Print a message describing the meaning of the given signal number. */
141 extern void psignal (int __sig, __const char *__s);
142 #endif /* Use misc. */
145 /* The `sigpause' function has two different interfaces. The original
146 BSD definition defines the argument as a mask of the signal, while
147 the more modern interface in X/Open defines it as the signal
148 number. We go with the BSD version unless the user explicitly
149 selects the X/Open version.
151 This function is a cancellation point and therefore not marked with
153 extern int __sigpause (int __sig_or_mask, int __is_sig);
156 /* Set the mask of blocked signals to MASK,
157 wait for a signal to arrive, and then restore the mask. */
158 extern int sigpause (int __mask) __THROW __attribute_deprecated__;
162 extern int sigpause (int __sig) __asm__ ("__xpg_sigpause");
164 /* Remove a signal from the signal mask and suspend the process. */
165 # define sigpause(sig) __sigpause ((sig), 1)
172 /* None of the following functions should be used anymore. They are here
173 only for compatibility. A single word (`int') is not guaranteed to be
174 enough to hold a complete signal mask and therefore these functions
175 simply do not work in many situations. Use `sigprocmask' instead. */
177 /* Compute mask for signal SIG. */
178 # define sigmask(sig) __sigmask(sig)
180 /* Block signals in MASK, returning the old mask. */
181 extern int sigblock (int __mask) __THROW __attribute_deprecated__;
183 /* Set the mask of blocked signals to MASK, returning the old mask. */
184 extern int sigsetmask (int __mask) __THROW __attribute_deprecated__;
186 /* Return currently selected signal mask. */
187 extern int siggetmask (void) __THROW __attribute_deprecated__;
188 #endif /* Use BSD. */
196 typedef __sighandler_t sighandler_t;
199 /* 4.4 BSD uses the name `sig_t' for this. */
201 typedef __sighandler_t sig_t;
206 # ifdef __USE_POSIX199309
207 /* We need `struct timespec' later on. */
208 # define __need_timespec
211 /* Get the `siginfo_t' type plus the needed symbols. */
212 # include <bits/siginfo.h>
215 /* Clear all signals from SET. */
216 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
218 /* Set all signals in SET. */
219 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
221 /* Add SIGNO to SET. */
222 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
224 /* Remove SIGNO from SET. */
225 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
227 /* Return 1 if SIGNO is in SET, 0 if not. */
228 extern int sigismember (__const sigset_t *__set, int __signo)
229 __THROW __nonnull ((1));
232 /* Return non-empty value is SET is not empty. */
233 extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));
235 /* Build new signal set by combining the two inputs set using logical AND. */
236 extern int sigandset (sigset_t *__set, __const sigset_t *__left,
237 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
239 /* Build new signal set by combining the two inputs set using logical OR. */
240 extern int sigorset (sigset_t *__set, __const sigset_t *__left,
241 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
244 /* Get the system-specific definitions of `struct sigaction'
245 and the `SA_*' and `SIG_*'. constants. */
246 # include <bits/sigaction.h>
248 /* Get and/or change the set of blocked signals. */
249 extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
250 sigset_t *__restrict __oset) __THROW;
252 /* Change the set of blocked signals to SET,
253 wait until a signal arrives, and restore the set of blocked signals.
255 This function is a cancellation point and therefore not marked with
257 extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));
259 /* Get and/or set the action for signal SIG. */
260 extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
261 struct sigaction *__restrict __oact) __THROW;
263 /* Put in SET all signals that are blocked and waiting to be delivered. */
264 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
267 /* Select any of pending signals from SET or wait for any to arrive.
269 This function is a cancellation point and therefore not marked with
271 extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
274 # ifdef __USE_POSIX199309
275 /* Select any of pending signals from SET and place information in INFO.
277 This function is a cancellation point and therefore not marked with
279 extern int sigwaitinfo (__const sigset_t *__restrict __set,
280 siginfo_t *__restrict __info) __nonnull ((1));
282 /* Select any of pending signals from SET and place information in INFO.
283 Wait the time specified by TIMEOUT if no signal is pending.
285 This function is a cancellation point and therefore not marked with
287 extern int sigtimedwait (__const sigset_t *__restrict __set,
288 siginfo_t *__restrict __info,
289 __const struct timespec *__restrict __timeout)
292 /* Send signal SIG to the process PID. Associate data in VAL with the
294 extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)
296 # endif /* Use POSIX 199306. */
298 #endif /* Use POSIX. */
302 /* Names of the signals. This variable exists only for compatibility.
303 Use `strsignal' instead (see <string.h>). */
304 extern __const char *__const _sys_siglist[_NSIG];
305 extern __const char *__const sys_siglist[_NSIG];
307 /* Structure passed to `sigvec'. */
310 __sighandler_t sv_handler; /* Signal handler. */
311 int sv_mask; /* Mask of signals to be blocked. */
313 int sv_flags; /* Flags (see below). */
314 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
317 /* Bits in `sv_flags'. */
318 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
319 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
320 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
323 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
324 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
325 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
326 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
327 it is filled in with the old information for SIG. */
328 extern int sigvec (int __sig, __const struct sigvec *__vec,
329 struct sigvec *__ovec) __THROW;
332 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
333 # include <bits/sigcontext.h>
335 /* Restore the state saved in SCP. */
336 extern int sigreturn (struct sigcontext *__scp) __THROW;
338 #endif /* use BSD. */
341 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
342 # define __need_size_t
345 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
346 (causing them to fail with EINTR); if INTERRUPT is zero, make system
347 calls be restarted after signal SIG. */
348 extern int siginterrupt (int __sig, int __interrupt) __THROW;
350 # include <bits/sigstack.h>
352 /* This will define `ucontext_t' and `mcontext_t'. */
353 # include <sys/ucontext.h>
356 /* Run signals handlers on the stack specified by SS (if not NULL).
357 If OSS is not NULL, it is filled in with the old signal stack status.
358 This interface is obsolete and on many platform not implemented. */
359 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
360 __THROW __attribute_deprecated__;
362 /* Alternate signal handler stack interface.
363 This interface should always be preferred over `sigstack'. */
364 extern int sigaltstack (__const struct sigaltstack *__restrict __ss,
365 struct sigaltstack *__restrict __oss) __THROW;
367 #endif /* use BSD or X/Open Unix. */
369 #ifdef __USE_XOPEN_EXTENDED
370 /* Simplified interface for signal management. */
372 /* Add SIG to the calling process' signal mask. */
373 extern int sighold (int __sig) __THROW;
375 /* Remove SIG from the calling process' signal mask. */
376 extern int sigrelse (int __sig) __THROW;
378 /* Set the disposition of SIG to SIG_IGN. */
379 extern int sigignore (int __sig) __THROW;
381 /* Set the disposition of SIG. */
382 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
385 #if defined __USE_POSIX199506 || defined __USE_UNIX98
386 /* Some of the functions for handling signals in threaded programs must
388 # include <bits/pthreadtypes.h>
389 # include <bits/sigthread.h>
390 #endif /* use Unix98 */
392 /* The following functions are used internally in the C library and in
393 other code which need deep insights. */
395 /* Return number of available real-time signal with highest priority. */
396 extern int __libc_current_sigrtmin (void) __THROW;
397 /* Return number of available real-time signal with lowest priority. */
398 extern int __libc_current_sigrtmax (void) __THROW;
400 #endif /* signal.h */
404 #endif /* not signal.h */