1 /* Copyright (C) 1991-1999,2000,2001,2002,2003 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>
61 # ifndef __pid_t_defined
62 typedef __pid_t pid_t
;
63 # define __pid_t_defined
65 # ifndef __uid_t_defined
66 typedef __uid_t uid_t
;
67 # define __uid_t_defined
72 /* Type of a signal handler. */
73 typedef void (*__sighandler_t
) (int);
75 /* The X/Open definition of `signal' specifies the SVID semantic. Use
76 the additional function `sysv_signal' when X/Open compatibility is
78 extern __sighandler_t
__sysv_signal (int __sig
, __sighandler_t __handler
)
81 extern __sighandler_t
sysv_signal (int __sig
, __sighandler_t __handler
)
85 /* Set the handler for the signal SIG to HANDLER, returning the old
86 handler, or SIG_ERR on error.
87 By default `signal' has the BSD semantic. */
90 extern __sighandler_t
signal (int __sig
, __sighandler_t __handler
) __THROW
;
92 /* Make sure the used `signal' implementation is the SVID version. */
94 extern __sighandler_t
__REDIRECT (signal
,
96 __sighandler_t __handler
) __THROW
,
99 # define signal __sysv_signal
105 /* The X/Open definition of `signal' conflicts with the BSD version.
106 So they defined another function `bsd_signal'. */
107 extern __sighandler_t
bsd_signal (int __sig
, __sighandler_t __handler
) __THROW
;
110 /* Send signal SIG to process number PID. If PID is zero,
111 send SIG to all processes in the current process's process group.
112 If PID is < -1, send SIG to all processes in process group - PID. */
114 extern int kill (__pid_t __pid
, int __sig
) __THROW
;
115 #endif /* Use POSIX. */
117 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
118 /* Send SIG to all processes in process group PGRP.
119 If PGRP is zero, send SIG to all processes in
120 the current process's process group. */
121 extern int killpg (__pid_t __pgrp
, int __sig
) __THROW
;
122 #endif /* Use BSD || X/Open Unix. */
124 __BEGIN_NAMESPACE_STD
125 /* Raise signal SIG, i.e., send SIG to yourself. */
126 extern int raise (int __sig
) __THROW
;
130 /* SVID names for the same things. */
131 extern __sighandler_t
ssignal (int __sig
, __sighandler_t __handler
) __THROW
;
132 extern int gsignal (int __sig
) __THROW
;
133 #endif /* Use SVID. */
136 /* Print a message describing the meaning of the given signal number. */
137 extern void psignal (int __sig
, __const
char *__s
) __THROW
;
138 #endif /* Use misc. */
141 /* The `sigpause' function has two different interfaces. The original
142 BSD definition defines the argument as a mask of the signal, while
143 the more modern interface in X/Open defines it as the signal
144 number. We go with the BSD version unless the user explicitly
145 selects the X/Open version.
147 This function is a cancellation point and therefore not marked with
149 extern int __sigpause (int __sig_or_mask
, int __is_sig
);
152 /* Set the mask of blocked signals to MASK,
153 wait for a signal to arrive, and then restore the mask. */
154 extern int sigpause (int __mask
) __THROW
;
155 # define sigpause(mask) __sigpause ((mask), 0)
159 extern int sigpause (int __sig
) __asm__ ("__xpg_sigpause");
161 /* Remove a signal from the signal mask and suspend the process. */
162 # define sigpause(sig) __sigpause ((sig), 1)
168 /* None of the following functions should be used anymore. They are here
169 only for compatibility. A single word (`int') is not guaranteed to be
170 enough to hold a complete signal mask and therefore these functions
171 simply do not work in many situations. Use `sigprocmask' instead. */
173 /* Compute mask for signal SIG. */
174 # define sigmask(sig) __sigmask(sig)
176 /* Block signals in MASK, returning the old mask. */
177 extern int sigblock (int __mask
) __THROW
;
179 /* Set the mask of blocked signals to MASK, returning the old mask. */
180 extern int sigsetmask (int __mask
) __THROW
;
182 /* Return currently selected signal mask. */
183 extern int siggetmask (void) __THROW
;
184 #endif /* Use BSD. */
192 typedef __sighandler_t sighandler_t
;
195 /* 4.4 BSD uses the name `sig_t' for this. */
197 typedef __sighandler_t sig_t
;
202 # ifdef __USE_POSIX199309
203 /* We need `struct timespec' later on. */
204 # define __need_timespec
207 /* Get the `siginfo_t' type plus the needed symbols. */
208 # include <bits/siginfo.h>
211 /* Clear all signals from SET. */
212 extern int sigemptyset (sigset_t
*__set
) __THROW
;
214 /* Set all signals in SET. */
215 extern int sigfillset (sigset_t
*__set
) __THROW
;
217 /* Add SIGNO to SET. */
218 extern int sigaddset (sigset_t
*__set
, int __signo
) __THROW
;
220 /* Remove SIGNO from SET. */
221 extern int sigdelset (sigset_t
*__set
, int __signo
) __THROW
;
223 /* Return 1 if SIGNO is in SET, 0 if not. */
224 extern int sigismember (__const sigset_t
*__set
, int __signo
) __THROW
;
227 /* Return non-empty value is SET is not empty. */
228 extern int sigisemptyset (__const sigset_t
*__set
) __THROW
;
230 /* Build new signal set by combining the two inputs set using logical AND. */
231 extern int sigandset (sigset_t
*__set
, __const sigset_t
*__left
,
232 __const sigset_t
*__right
) __THROW
;
234 /* Build new signal set by combining the two inputs set using logical OR. */
235 extern int sigorset (sigset_t
*__set
, __const sigset_t
*__left
,
236 __const sigset_t
*__right
) __THROW
;
239 /* Get the system-specific definitions of `struct sigaction'
240 and the `SA_*' and `SIG_*'. constants. */
241 # include <bits/sigaction.h>
243 /* Get and/or change the set of blocked signals. */
244 extern int sigprocmask (int __how
, __const sigset_t
*__restrict __set
,
245 sigset_t
*__restrict __oset
) __THROW
;
247 /* Change the set of blocked signals to SET,
248 wait until a signal arrives, and restore the set of blocked signals.
250 This function is a cancellation point and therefore not marked with
252 extern int sigsuspend (__const sigset_t
*__set
);
254 /* Get and/or set the action for signal SIG. */
255 extern int sigaction (int __sig
, __const
struct sigaction
*__restrict __act
,
256 struct sigaction
*__restrict __oact
) __THROW
;
258 /* Put in SET all signals that are blocked and waiting to be delivered. */
259 extern int sigpending (sigset_t
*__set
) __THROW
;
262 /* Select any of pending signals from SET or wait for any to arrive.
264 This function is a cancellation point and therefore not marked with
266 extern int sigwait (__const sigset_t
*__restrict __set
, int *__restrict __sig
);
268 # ifdef __USE_POSIX199309
269 /* Select any of pending signals from SET and place information in INFO.
271 This function is a cancellation point and therefore not marked with
273 extern int sigwaitinfo (__const sigset_t
*__restrict __set
,
274 siginfo_t
*__restrict __info
);
276 /* Select any of pending signals from SET and place information in INFO.
277 Wait the time specified by TIMEOUT if no signal is pending.
279 This function is a cancellation point and therefore not marked with
281 extern int sigtimedwait (__const sigset_t
*__restrict __set
,
282 siginfo_t
*__restrict __info
,
283 __const
struct timespec
*__restrict __timeout
);
285 /* Send signal SIG to the process PID. Associate data in VAL with the
287 extern int sigqueue (__pid_t __pid
, int __sig
, __const
union sigval __val
)
289 # endif /* Use POSIX 199306. */
291 #endif /* Use POSIX. */
295 /* Names of the signals. This variable exists only for compatibility.
296 Use `strsignal' instead (see <string.h>). */
297 extern __const
char *__const _sys_siglist
[_NSIG
];
298 extern __const
char *__const sys_siglist
[_NSIG
];
300 /* Structure passed to `sigvec'. */
303 __sighandler_t sv_handler
; /* Signal handler. */
304 int sv_mask
; /* Mask of signals to be blocked. */
306 int sv_flags
; /* Flags (see below). */
307 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
310 /* Bits in `sv_flags'. */
311 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
312 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
313 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
316 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
317 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
318 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
319 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
320 it is filled in with the old information for SIG. */
321 extern int sigvec (int __sig
, __const
struct sigvec
*__vec
,
322 struct sigvec
*__ovec
) __THROW
;
325 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
326 # include <bits/sigcontext.h>
328 /* Restore the state saved in SCP. */
329 extern int sigreturn (struct sigcontext
*__scp
) __THROW
;
331 #endif /* use BSD. */
334 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
336 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
337 (causing them to fail with EINTR); if INTERRUPT is zero, make system
338 calls be restarted after signal SIG. */
339 extern int siginterrupt (int __sig
, int __interrupt
) __THROW
;
341 # include <bits/sigstack.h>
343 /* This will define `ucontext_t' and `mcontext_t'. */
344 # include <sys/ucontext.h>
347 /* Run signals handlers on the stack specified by SS (if not NULL).
348 If OSS is not NULL, it is filled in with the old signal stack status.
349 This interface is obsolete and on many platform not implemented. */
350 extern int sigstack (struct sigstack
*__ss
, struct sigstack
*__oss
) __THROW
;
352 /* Alternate signal handler stack interface.
353 This interface should always be preferred over `sigstack'. */
354 extern int sigaltstack (__const
struct sigaltstack
*__restrict __ss
,
355 struct sigaltstack
*__restrict __oss
) __THROW
;
357 #endif /* use BSD or X/Open Unix. */
360 /* Simplified interface for signal management. */
362 /* Add SIG to the calling process' signal mask. */
363 extern int sighold (int __sig
) __THROW
;
365 /* Remove SIG from the calling process' signal mask. */
366 extern int sigrelse (int __sig
) __THROW
;
368 /* Set the disposition of SIG to SIG_IGN. */
369 extern int sigignore (int __sig
) __THROW
;
371 /* Set the disposition of SIG. */
372 extern __sighandler_t
sigset (int __sig
, __sighandler_t __disp
) __THROW
;
375 #if defined __USE_POSIX199506 || defined __USE_UNIX98
376 /* Some of the functions for handling signals in threaded programs must
378 # include <bits/pthreadtypes.h>
379 # include <bits/sigthread.h>
380 #endif /* use Unix98 */
382 /* The following functions are used internally in the C library and in
383 other code which need deep insights. */
385 /* Return number of available real-time signal with highest priority. */
386 extern int __libc_current_sigrtmin (void) __THROW
;
387 /* Return number of available real-time signal with lowest priority. */
388 extern int __libc_current_sigrtmax (void) __THROW
;
390 #endif /* signal.h */
394 #endif /* not signal.h */