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 # define sigpause(mask) __sigpause ((mask), 0)
190 /* Remove a signal from the signal mask and suspend the process. */
191 # define sigpause(sig) __sigpause ((sig), 1)
197 /* None of the following functions should be used anymore. They are here
198 only for compatibility. A single word (`int') is not guaranteed to be
199 enough to hold a complete signal mask and therefore these functions
200 simply do not work in many situations. Use `sigprocmask' instead. */
202 /* Compute mask for signal SIG. */
203 # define sigmask(sig) __sigmask(sig)
205 /* Block signals in MASK, returning the old mask. */
206 extern int sigblock (int __mask) __THROW;
207 /* collides with libc_hidden_proto: __attribute_deprecated__; */
208 libc_hidden_proto(sigblock)
210 /* Set the mask of blocked signals to MASK, returning the old mask. */
211 extern int sigsetmask (int __mask) __THROW;
212 /* collides with libc_hidden_proto: __attribute_deprecated__; */
213 libc_hidden_proto(sigsetmask)
215 /* Return currently selected signal mask. */
216 extern int siggetmask (void) __THROW __attribute_deprecated__;
217 #endif /* Use BSD. */
221 typedef __sighandler_t sighandler_t;
224 /* 4.4 BSD uses the name `sig_t' for this. */
226 typedef __sighandler_t sig_t;
231 # ifdef __USE_POSIX199309
232 /* We need `struct timespec' later on. */
233 # define __need_timespec
236 /* Get the `siginfo_t' type plus the needed symbols. */
237 # include <bits/siginfo.h>
240 /* Clear all signals from SET. */
241 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
242 libc_hidden_proto(sigemptyset)
244 /* Set all signals in SET. */
245 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
246 libc_hidden_proto(sigfillset)
248 /* Add SIGNO to SET. */
249 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
250 libc_hidden_proto(sigaddset)
252 /* Remove SIGNO from SET. */
253 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
254 libc_hidden_proto(sigdelset)
256 /* Return 1 if SIGNO is in SET, 0 if not. */
257 extern int sigismember (__const sigset_t *__set, int __signo)
258 __THROW __nonnull ((1));
261 /* Return non-empty value is SET is not empty. */
262 extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));
264 /* Build new signal set by combining the two inputs set using logical AND. */
265 extern int sigandset (sigset_t *__set, __const sigset_t *__left,
266 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
268 /* Build new signal set by combining the two inputs set using logical OR. */
269 extern int sigorset (sigset_t *__set, __const sigset_t *__left,
270 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
273 /* Get the system-specific definitions of `struct sigaction'
274 and the `SA_*' and `SIG_*'. constants. */
275 # include <bits/sigaction.h>
277 /* Get and/or change the set of blocked signals. */
278 extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
279 sigset_t *__restrict __oset) __THROW;
280 libc_hidden_proto(sigprocmask)
282 /* Change the set of blocked signals to SET,
283 wait until a signal arrives, and restore the set of blocked signals.
285 This function is a cancellation point and therefore not marked with
287 extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));
288 libc_hidden_proto(sigsuspend)
290 /* Get and/or set the action for signal SIG. */
291 extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
292 struct sigaction *__restrict __oact) __THROW;
293 libc_hidden_proto(sigaction)
295 /* Put in SET all signals that are blocked and waiting to be delivered. */
296 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
299 /* Select any of pending signals from SET or wait for any to arrive.
301 This function is a cancellation point and therefore not marked with
303 extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
306 # if defined __USE_POSIX199309 && defined __UCLIBC_HAS_REALTIME__
307 /* Select any of pending signals from SET and place information in INFO.
309 This function is a cancellation point and therefore not marked with
311 extern int sigwaitinfo (__const sigset_t *__restrict __set,
312 siginfo_t *__restrict __info) __nonnull ((1));
314 extern __typeof(sigwaitinfo) __sigwaitinfo attribute_hidden;
316 libc_hidden_proto(sigwaitinfo)
318 /* Select any of pending signals from SET and place information in INFO.
319 Wait the time specified by TIMEOUT if no signal is pending.
321 This function is a cancellation point and therefore not marked with
323 extern int sigtimedwait (__const sigset_t *__restrict __set,
324 siginfo_t *__restrict __info,
325 __const struct timespec *__restrict __timeout)
328 extern __typeof(sigtimedwait) __sigtimedwait attribute_hidden;
330 libc_hidden_proto(sigtimedwait)
332 /* Send signal SIG to the process PID. Associate data in VAL with the
334 extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)
336 # endif /* Use POSIX 199306. */
338 #endif /* Use POSIX. */
342 # ifdef __UCLIBC_HAS_SYS_SIGLIST__
343 /* Names of the signals. This variable exists only for compatibility.
344 Use `strsignal' instead (see <string.h>). */
345 # define _sys_siglist sys_siglist
346 extern __const char *__const sys_siglist[_NSIG];
349 /* Structure passed to `sigvec'. */
352 __sighandler_t sv_handler; /* Signal handler. */
353 int sv_mask; /* Mask of signals to be blocked. */
355 int sv_flags; /* Flags (see below). */
356 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
359 /* Bits in `sv_flags'. */
360 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
361 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
362 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
365 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
366 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
367 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
368 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
369 it is filled in with the old information for SIG. */
370 extern int sigvec (int __sig, __const struct sigvec *__vec,
371 struct sigvec *__ovec) __THROW;
374 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
375 # include <bits/sigcontext.h>
377 /* Restore the state saved in SCP. */
378 extern int sigreturn (struct sigcontext *__scp) __THROW;
380 #endif /* use BSD. */
383 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
385 # ifdef __UCLIBC_SUSV4_LEGACY__
386 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
387 (causing them to fail with EINTR); if INTERRUPT is zero, make system
388 calls be restarted after signal SIG. */
389 extern int siginterrupt (int __sig, int __interrupt) __THROW;
392 # include <bits/sigstack.h>
394 /* This will define `ucontext_t' and `mcontext_t'. */
395 /* SuSv4 obsoleted include/ucontext.h */
396 # include <sys/ucontext.h>
400 /* Run signals handlers on the stack specified by SS (if not NULL).
401 If OSS is not NULL, it is filled in with the old signal stack status.
402 This interface is obsolete and on many platform not implemented. */
403 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
404 __THROW __attribute_deprecated__;
407 /* Alternate signal handler stack interface.
408 This interface should always be preferred over `sigstack'. */
409 extern int sigaltstack (__const struct sigaltstack *__restrict __ss,
410 struct sigaltstack *__restrict __oss) __THROW;
412 #endif /* use BSD or X/Open Unix. */
414 #if defined __USE_XOPEN_EXTENDED && defined __UCLIBC_HAS_OBSOLETE_BSD_SIGNAL__
415 /* Simplified interface for signal management. */
417 /* Add SIG to the calling process' signal mask. */
418 extern int sighold (int __sig) __THROW;
420 /* Remove SIG from the calling process' signal mask. */
421 extern int sigrelse (int __sig) __THROW;
423 /* Set the disposition of SIG to SIG_IGN. */
424 extern int sigignore (int __sig) __THROW;
426 /* Set the disposition of SIG. */
427 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
430 #if defined __UCLIBC_HAS_THREADS__ && (defined __USE_POSIX199506 || defined __USE_UNIX98)
431 /* Some of the functions for handling signals in threaded programs must
433 # include <bits/pthreadtypes.h>
434 # include <bits/sigthread.h>
437 /* The following functions are used internally in the C library and in
438 other code which need deep insights. */
440 /* Return number of available real-time signal with highest priority. */
441 extern int __libc_current_sigrtmin (void) __THROW;
442 /* Return number of available real-time signal with lowest priority. */
443 extern int __libc_current_sigrtmax (void) __THROW;
445 #endif /* signal.h */
449 #endif /* not signal.h */