1 /* Copyright (C) 1991-2003, 2004 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 /* Fake signal functions. */
61 #define SIG_ERR ((__sighandler_t) -1) /* Error return. */
62 #define SIG_DFL ((__sighandler_t) 0) /* Default action. */
63 #define SIG_IGN ((__sighandler_t) 1) /* Ignore signal. */
65 # define SIG_HOLD ((__sighandler_t) 2) /* Add signal to hold mask. */
67 /* Biggest signal number + 1 (including real-time signals). */
68 #ifndef _NSIG /* if arch has not defined it in bits/signum.h... */
74 /* Real-time signal range */
75 #define SIGRTMIN (__libc_current_sigrtmin())
76 #define SIGRTMAX (__libc_current_sigrtmax())
77 /* These are the hard limits of the kernel. These values should not be
78 used directly at user level. */
79 #ifndef __SIGRTMIN /* if arch has not defined it in bits/signum.h... */
80 # define __SIGRTMIN 32
82 #define __SIGRTMAX (_NSIG - 1)
85 #if defined __USE_XOPEN || defined __USE_XOPEN2K
86 # ifndef __pid_t_defined
87 typedef __pid_t pid_t;
88 # define __pid_t_defined
90 # ifndef __uid_t_defined
91 typedef __uid_t uid_t;
92 # define __uid_t_defined
97 /* Type of a signal handler. */
98 typedef void (*__sighandler_t) (int);
99 #if defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
100 /* The X/Open definition of `signal' specifies the SVID semantic. Use
101 the additional function `sysv_signal' when X/Open compatibility is
103 extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
106 extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
109 #endif /* __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__ */
111 /* Set the handler for the signal SIG to HANDLER, returning the old
112 handler, or SIG_ERR on error.
113 By default `signal' has the BSD semantic. */
114 __BEGIN_NAMESPACE_STD
115 #if defined __USE_BSD || !defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
116 extern __sighandler_t signal (int __sig, __sighandler_t __handler)
118 libc_hidden_proto(signal)
120 /* Make sure the used `signal' implementation is the SVID version. */
121 # ifdef __REDIRECT_NTH
122 extern __sighandler_t __REDIRECT_NTH (signal,
123 (int __sig, __sighandler_t __handler),
126 # define signal __sysv_signal
131 #if defined __USE_XOPEN && defined __UCLIBC_SUSV3_LEGACY__
132 /* The X/Open definition of `signal' conflicts with the BSD version.
133 So they defined another function `bsd_signal'. */
134 extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
138 /* Send signal SIG to process number PID. If PID is zero,
139 send SIG to all processes in the current process's process group.
140 If PID is < -1, send SIG to all processes in process group - PID. */
142 extern int kill (__pid_t __pid, int __sig) __THROW;
143 libc_hidden_proto(kill)
146 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
147 /* Send SIG to all processes in process group PGRP.
148 If PGRP is zero, send SIG to all processes in
149 the current process's process group. */
150 extern int killpg (__pid_t __pgrp, int __sig) __THROW;
153 __BEGIN_NAMESPACE_STD
154 /* Raise signal SIG, i.e., send SIG to yourself. */
155 extern int raise (int __sig) __THROW;
156 libc_hidden_proto(raise)
160 /* SVID names for the same things. */
161 extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
163 extern int gsignal (int __sig) __THROW;
164 #endif /* Use SVID. */
167 /* Print a message describing the meaning of the given signal number. */
168 extern void psignal (int __sig, __const char *__s);
169 #endif /* Use misc. */
172 /* The `sigpause' function has two different interfaces. The original
173 BSD definition defines the argument as a mask of the signal, while
174 the more modern interface in X/Open defines it as the signal
175 number. We go with the BSD version unless the user explicitly
176 selects the X/Open version.
178 This function is a cancellation point and therefore not marked with
180 extern int __sigpause (int __sig_or_mask, int __is_sig);
181 libc_hidden_proto(__sigpause)
184 /* Set the mask of blocked signals to MASK,
185 wait for a signal to arrive, and then restore the mask. */
186 extern int sigpause (int __mask) __THROW __attribute_deprecated__;
187 libc_hidden_proto(sigpause)
188 # define sigpause(mask) __sigpause ((mask), 0)
191 /* Remove a signal from the signal mask and suspend the process. */
192 # define sigpause(sig) __sigpause ((sig), 1)
198 /* None of the following functions should be used anymore. They are here
199 only for compatibility. A single word (`int') is not guaranteed to be
200 enough to hold a complete signal mask and therefore these functions
201 simply do not work in many situations. Use `sigprocmask' instead. */
203 /* Compute mask for signal SIG. */
204 # define sigmask(sig) __sigmask(sig)
206 /* Block signals in MASK, returning the old mask. */
207 extern int sigblock (int __mask) __THROW;
208 /* collides with libc_hidden_proto: __attribute_deprecated__; */
209 libc_hidden_proto(sigblock)
211 /* Set the mask of blocked signals to MASK, returning the old mask. */
212 extern int sigsetmask (int __mask) __THROW;
213 /* collides with libc_hidden_proto: __attribute_deprecated__; */
214 libc_hidden_proto(sigsetmask)
216 /* Return currently selected signal mask. */
217 extern int siggetmask (void) __THROW __attribute_deprecated__;
218 #endif /* Use BSD. */
222 typedef __sighandler_t sighandler_t;
225 /* 4.4 BSD uses the name `sig_t' for this. */
227 typedef __sighandler_t sig_t;
232 # ifdef __USE_POSIX199309
233 /* We need `struct timespec' later on. */
234 # define __need_timespec
237 /* Get the `siginfo_t' type plus the needed symbols. */
238 # include <bits/siginfo.h>
241 /* Clear all signals from SET. */
242 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
243 libc_hidden_proto(sigemptyset)
245 /* Set all signals in SET. */
246 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
247 libc_hidden_proto(sigfillset)
249 /* Add SIGNO to SET. */
250 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
251 libc_hidden_proto(sigaddset)
253 /* Remove SIGNO from SET. */
254 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
255 libc_hidden_proto(sigdelset)
257 /* Return 1 if SIGNO is in SET, 0 if not. */
258 extern int sigismember (__const sigset_t *__set, int __signo)
259 __THROW __nonnull ((1));
262 /* Return non-empty value is SET is not empty. */
263 extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));
265 /* Build new signal set by combining the two inputs set using logical AND. */
266 extern int sigandset (sigset_t *__set, __const sigset_t *__left,
267 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
269 /* Build new signal set by combining the two inputs set using logical OR. */
270 extern int sigorset (sigset_t *__set, __const sigset_t *__left,
271 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
274 /* Get the system-specific definitions of `struct sigaction'
275 and the `SA_*' and `SIG_*'. constants. */
276 # include <bits/sigaction.h>
278 /* Get and/or change the set of blocked signals. */
279 extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
280 sigset_t *__restrict __oset) __THROW;
281 libc_hidden_proto(sigprocmask)
283 /* Change the set of blocked signals to SET,
284 wait until a signal arrives, and restore the set of blocked signals.
286 This function is a cancellation point and therefore not marked with
288 extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));
289 libc_hidden_proto(sigsuspend)
291 /* Get and/or set the action for signal SIG. */
292 extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
293 struct sigaction *__restrict __oact) __THROW;
294 libc_hidden_proto(sigaction)
296 /* Put in SET all signals that are blocked and waiting to be delivered. */
297 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
300 /* Select any of pending signals from SET or wait for any to arrive.
302 This function is a cancellation point and therefore not marked with
304 extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
307 # if defined __USE_POSIX199309 && defined __UCLIBC_HAS_REALTIME__
308 /* Select any of pending signals from SET and place information in INFO.
310 This function is a cancellation point and therefore not marked with
312 extern int sigwaitinfo (__const sigset_t *__restrict __set,
313 siginfo_t *__restrict __info) __nonnull ((1));
314 libc_hidden_proto(sigwaitinfo)
316 /* Select any of pending signals from SET and place information in INFO.
317 Wait the time specified by TIMEOUT if no signal is pending.
319 This function is a cancellation point and therefore not marked with
321 extern int sigtimedwait (__const sigset_t *__restrict __set,
322 siginfo_t *__restrict __info,
323 __const struct timespec *__restrict __timeout)
325 libc_hidden_proto(sigtimedwait)
327 /* Send signal SIG to the process PID. Associate data in VAL with the
329 extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)
331 # endif /* Use POSIX 199306. */
333 #endif /* Use POSIX. */
337 # ifdef __UCLIBC_HAS_SYS_SIGLIST__
338 /* Names of the signals. This variable exists only for compatibility.
339 Use `strsignal' instead (see <string.h>). */
340 # define _sys_siglist sys_siglist
341 extern __const char *__const sys_siglist[_NSIG];
344 /* Structure passed to `sigvec'. */
347 __sighandler_t sv_handler; /* Signal handler. */
348 int sv_mask; /* Mask of signals to be blocked. */
350 int sv_flags; /* Flags (see below). */
351 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
354 /* Bits in `sv_flags'. */
355 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
356 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
357 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
360 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
361 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
362 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
363 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
364 it is filled in with the old information for SIG. */
365 extern int sigvec (int __sig, __const struct sigvec *__vec,
366 struct sigvec *__ovec) __THROW;
369 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
370 # include <bits/sigcontext.h>
372 /* Restore the state saved in SCP. */
373 extern int sigreturn (struct sigcontext *__scp) __THROW;
375 #endif /* use BSD. */
378 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
380 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
381 (causing them to fail with EINTR); if INTERRUPT is zero, make system
382 calls be restarted after signal SIG. */
383 extern int siginterrupt (int __sig, int __interrupt) __THROW;
385 # include <bits/sigstack.h>
387 /* This will define `ucontext_t' and `mcontext_t'. */
388 # include <ucontext.h>
391 /* Run signals handlers on the stack specified by SS (if not NULL).
392 If OSS is not NULL, it is filled in with the old signal stack status.
393 This interface is obsolete and on many platform not implemented. */
394 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
395 __THROW __attribute_deprecated__;
397 /* Alternate signal handler stack interface.
398 This interface should always be preferred over `sigstack'. */
399 extern int sigaltstack (__const struct sigaltstack *__restrict __ss,
400 struct sigaltstack *__restrict __oss) __THROW;
402 #endif /* use BSD or X/Open Unix. */
404 #if defined __USE_XOPEN_EXTENDED && defined __UCLIBC_HAS_OBSOLETE_BSD_SIGNAL__
405 /* Simplified interface for signal management. */
407 /* Add SIG to the calling process' signal mask. */
408 extern int sighold (int __sig) __THROW;
410 /* Remove SIG from the calling process' signal mask. */
411 extern int sigrelse (int __sig) __THROW;
413 /* Set the disposition of SIG to SIG_IGN. */
414 extern int sigignore (int __sig) __THROW;
416 /* Set the disposition of SIG. */
417 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
420 #if defined __UCLIBC_HAS_THREADS__ && (defined __USE_POSIX199506 || defined __USE_UNIX98)
421 /* Some of the functions for handling signals in threaded programs must
423 # include <bits/pthreadtypes.h>
424 # include <bits/sigthread.h>
427 /* The following functions are used internally in the C library and in
428 other code which need deep insights. */
430 /* Return number of available real-time signal with highest priority. */
431 extern int __libc_current_sigrtmin (void) __THROW;
432 /* Return number of available real-time signal with lowest priority. */
433 extern int __libc_current_sigrtmax (void) __THROW;
435 #endif /* signal.h */
439 #endif /* not signal.h */