1 /* Copyright (C) 1991-2004,2007,2009,2010,2012 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, see
16 <http://www.gnu.org/licenses/>. */
19 * ISO C99 Standard: 7.14 Signal handling <signal.h>
24 #if !defined __need_sig_atomic_t && !defined __need_sigset_t
32 #include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
34 /* An integral type that can be modified atomically, without the
35 possibility of a signal arriving in the middle of the operation. */
36 #if defined __need_sig_atomic_t || defined _SIGNAL_H
37 # ifndef __sig_atomic_t_defined
38 # define __sig_atomic_t_defined
40 typedef __sig_atomic_t sig_atomic_t;
43 # undef __need_sig_atomic_t
46 #if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)
47 # ifndef __sigset_t_defined
48 # define __sigset_t_defined
49 typedef __sigset_t sigset_t;
51 # undef __need_sigset_t
56 #include <bits/types.h>
57 #include <bits/signum.h>
59 #if defined __USE_XOPEN || defined __USE_XOPEN2K
60 # ifndef __pid_t_defined
61 typedef __pid_t pid_t;
62 # define __pid_t_defined
66 # ifndef __uid_t_defined
67 typedef __uid_t uid_t;
68 # define __uid_t_defined
72 #ifdef __USE_POSIX199309
73 /* We need `struct timespec' later on. */
74 # define __need_timespec
77 /* Get the `siginfo_t' type plus the needed symbols. */
78 # include <bits/siginfo.h>
82 /* Type of a signal handler. */
83 typedef void (*__sighandler_t) (int);
85 /* The X/Open definition of `signal' specifies the SVID semantic. Use
86 the additional function `sysv_signal' when X/Open compatibility is
88 extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
91 extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
95 /* Set the handler for the signal SIG to HANDLER, returning the old
96 handler, or SIG_ERR on error.
97 By default `signal' has the BSD semantic. */
100 extern __sighandler_t signal (int __sig, __sighandler_t __handler)
103 /* Make sure the used `signal' implementation is the SVID version. */
104 # ifdef __REDIRECT_NTH
105 extern __sighandler_t __REDIRECT_NTH (signal,
106 (int __sig, __sighandler_t __handler),
109 # define signal __sysv_signal
115 /* The X/Open definition of `signal' conflicts with the BSD version.
116 So they defined another function `bsd_signal'. */
117 extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
121 /* Send signal SIG to process number PID. If PID is zero,
122 send SIG to all processes in the current process's process group.
123 If PID is < -1, send SIG to all processes in process group - PID. */
125 extern int kill (__pid_t __pid, int __sig) __THROW;
126 #endif /* Use POSIX. */
128 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
129 /* Send SIG to all processes in process group PGRP.
130 If PGRP is zero, send SIG to all processes in
131 the current process's process group. */
132 extern int killpg (__pid_t __pgrp, int __sig) __THROW;
133 #endif /* Use BSD || X/Open Unix. */
135 __BEGIN_NAMESPACE_STD
136 /* Raise signal SIG, i.e., send SIG to yourself. */
137 extern int raise (int __sig) __THROW;
141 /* SVID names for the same things. */
142 extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
144 extern int gsignal (int __sig) __THROW;
145 #endif /* Use SVID. */
147 #if defined __USE_MISC || defined __USE_XOPEN2K
148 /* Print a message describing the meaning of the given signal number. */
149 extern void psignal (int __sig, const char *__s);
150 #endif /* Use misc or POSIX 2008. */
153 /* Print a message describing the meaning of the given signal information. */
154 extern void psiginfo (const siginfo_t *__pinfo, const char *__s);
155 #endif /* POSIX 2008. */
159 /* The `sigpause' function has two different interfaces. The original
160 BSD definition defines the argument as a mask of the signal, while
161 the more modern interface in X/Open defines it as the signal
162 number. We go with the BSD version unless the user explicitly
163 selects the X/Open version.
165 This function is a cancellation point and therefore not marked with
167 extern int __sigpause (int __sig_or_mask, int __is_sig);
170 /* Set the mask of blocked signals to MASK,
171 wait for a signal to arrive, and then restore the mask. */
172 extern int sigpause (int __mask) __THROW __attribute_deprecated__;
176 extern int sigpause (int __sig) __asm__ ("__xpg_sigpause");
178 /* Remove a signal from the signal mask and suspend the process. */
179 # define sigpause(sig) __sigpause ((sig), 1)
186 /* None of the following functions should be used anymore. They are here
187 only for compatibility. A single word (`int') is not guaranteed to be
188 enough to hold a complete signal mask and therefore these functions
189 simply do not work in many situations. Use `sigprocmask' instead. */
191 /* Compute mask for signal SIG. */
192 # define sigmask(sig) __sigmask(sig)
194 /* Block signals in MASK, returning the old mask. */
195 extern int sigblock (int __mask) __THROW __attribute_deprecated__;
197 /* Set the mask of blocked signals to MASK, returning the old mask. */
198 extern int sigsetmask (int __mask) __THROW __attribute_deprecated__;
200 /* Return currently selected signal mask. */
201 extern int siggetmask (void) __THROW __attribute_deprecated__;
202 #endif /* Use BSD. */
210 typedef __sighandler_t sighandler_t;
213 /* 4.4 BSD uses the name `sig_t' for this. */
215 typedef __sighandler_t sig_t;
220 /* Clear all signals from SET. */
221 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
223 /* Set all signals in SET. */
224 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
226 /* Add SIGNO to SET. */
227 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
229 /* Remove SIGNO from SET. */
230 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
232 /* Return 1 if SIGNO is in SET, 0 if not. */
233 extern int sigismember (const sigset_t *__set, int __signo)
234 __THROW __nonnull ((1));
237 /* Return non-empty value is SET is not empty. */
238 extern int sigisemptyset (const sigset_t *__set) __THROW __nonnull ((1));
240 /* Build new signal set by combining the two inputs set using logical AND. */
241 extern int sigandset (sigset_t *__set, const sigset_t *__left,
242 const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
244 /* Build new signal set by combining the two inputs set using logical OR. */
245 extern int sigorset (sigset_t *__set, const sigset_t *__left,
246 const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
249 /* Get the system-specific definitions of `struct sigaction'
250 and the `SA_*' and `SIG_*'. constants. */
251 # include <bits/sigaction.h>
253 /* Get and/or change the set of blocked signals. */
254 extern int sigprocmask (int __how, const sigset_t *__restrict __set,
255 sigset_t *__restrict __oset) __THROW;
257 /* Change the set of blocked signals to SET,
258 wait until a signal arrives, and restore the set of blocked signals.
260 This function is a cancellation point and therefore not marked with
262 extern int sigsuspend (const sigset_t *__set) __nonnull ((1));
264 /* Get and/or set the action for signal SIG. */
265 extern int sigaction (int __sig, const struct sigaction *__restrict __act,
266 struct sigaction *__restrict __oact) __THROW;
268 /* Put in SET all signals that are blocked and waiting to be delivered. */
269 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
272 /* Select any of pending signals from SET or wait for any to arrive.
274 This function is a cancellation point and therefore not marked with
276 extern int sigwait (const sigset_t *__restrict __set, int *__restrict __sig)
279 # ifdef __USE_POSIX199309
280 /* Select any of pending signals from SET and place information in INFO.
282 This function is a cancellation point and therefore not marked with
284 extern int sigwaitinfo (const sigset_t *__restrict __set,
285 siginfo_t *__restrict __info) __nonnull ((1));
287 /* Select any of pending signals from SET and place information in INFO.
288 Wait the time specified by TIMEOUT if no signal is pending.
290 This function is a cancellation point and therefore not marked with
292 extern int sigtimedwait (const sigset_t *__restrict __set,
293 siginfo_t *__restrict __info,
294 const struct timespec *__restrict __timeout)
297 /* Send signal SIG to the process PID. Associate data in VAL with the
299 extern int sigqueue (__pid_t __pid, int __sig, const union sigval __val)
301 # endif /* Use POSIX 199306. */
303 #endif /* Use POSIX. */
307 /* Names of the signals. This variable exists only for compatibility.
308 Use `strsignal' instead (see <string.h>). */
309 extern const char *const _sys_siglist[_NSIG];
310 extern const char *const sys_siglist[_NSIG];
312 /* Structure passed to `sigvec'. */
315 __sighandler_t sv_handler; /* Signal handler. */
316 int sv_mask; /* Mask of signals to be blocked. */
318 int sv_flags; /* Flags (see below). */
319 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
322 /* Bits in `sv_flags'. */
323 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
324 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
325 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
328 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
329 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
330 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
331 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
332 it is filled in with the old information for SIG. */
333 extern int sigvec (int __sig, const struct sigvec *__vec,
334 struct sigvec *__ovec) __THROW;
337 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
338 # include <bits/sigcontext.h>
340 /* Restore the state saved in SCP. */
341 extern int sigreturn (struct sigcontext *__scp) __THROW;
343 #endif /* use BSD. */
346 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
347 # define __need_size_t
350 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
351 (causing them to fail with EINTR); if INTERRUPT is zero, make system
352 calls be restarted after signal SIG. */
353 extern int siginterrupt (int __sig, int __interrupt) __THROW;
355 # include <bits/sigstack.h>
356 # if defined __USE_XOPEN || defined __USE_XOPEN2K8
357 /* This will define `ucontext_t' and `mcontext_t'. */
358 # include <sys/ucontext.h>
361 /* Run signals handlers on the stack specified by SS (if not NULL).
362 If OSS is not NULL, it is filled in with the old signal stack status.
363 This interface is obsolete and on many platform not implemented. */
364 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
365 __THROW __attribute_deprecated__;
367 /* Alternate signal handler stack interface.
368 This interface should always be preferred over `sigstack'. */
369 extern int sigaltstack (const struct sigaltstack *__restrict __ss,
370 struct sigaltstack *__restrict __oss) __THROW;
372 #endif /* use BSD or X/Open Unix. */
374 #ifdef __USE_XOPEN_EXTENDED
375 /* Simplified interface for signal management. */
377 /* Add SIG to the calling process' signal mask. */
378 extern int sighold (int __sig) __THROW;
380 /* Remove SIG from the calling process' signal mask. */
381 extern int sigrelse (int __sig) __THROW;
383 /* Set the disposition of SIG to SIG_IGN. */
384 extern int sigignore (int __sig) __THROW;
386 /* Set the disposition of SIG. */
387 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
390 #if defined __USE_POSIX199506 || defined __USE_UNIX98
391 /* Some of the functions for handling signals in threaded programs must
393 # include <bits/pthreadtypes.h>
394 # include <bits/sigthread.h>
395 #endif /* use Unix98 */
397 /* The following functions are used internally in the C library and in
398 other code which need deep insights. */
400 /* Return number of available real-time signal with highest priority. */
401 extern int __libc_current_sigrtmin (void) __THROW;
402 /* Return number of available real-time signal with lowest priority. */
403 extern int __libc_current_sigrtmax (void) __THROW;
405 #endif /* signal.h */
409 #endif /* not signal.h */