1 /* Copyright (C) 1991,92,93,94,95,96,97,98 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
20 * ISO C Standard: 4.7 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 #ifndef __sig_atomic_t_defined
38 # if defined __need_sig_atomic_t || defined _SIGNAL_H
39 # undef __need_sig_atomic_t
40 # define __sig_atomic_t_defined 1
41 typedef __sig_atomic_t sig_atomic_t;
45 #ifndef __sigset_t_defined
46 # if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)
47 # undef __need_sigset_t
48 # define __sigset_t_defined 1
49 typedef __sigset_t sigset_t;
55 #include <bits/types.h>
56 #include <bits/signum.h>
58 #if defined __USE_XOPEN && !defined pid_t
59 typedef __pid_t pid_t;
64 /* Type of a signal handler. */
65 typedef void (*__sighandler_t) __PMT ((int));
67 /* The X/Open definition of `signal' specifies the SVID semantic. Use
68 the additional function `sysv_signal' when X/Open compatibility is
70 extern __sighandler_t __sysv_signal __P ((int __sig,
71 __sighandler_t __handler));
73 extern __sighandler_t sysv_signal __P ((int __sig, __sighandler_t __handler));
76 /* Set the handler for the signal SIG to HANDLER, returning the old
77 handler, or SIG_ERR on error.
78 By default `signal' has the BSD semantic. */
80 extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler));
82 /* Make sure the used `signal' implementation is the SVID version. */
84 extern __sighandler_t __REDIRECT (signal,
85 __P ((int __sig, __sighandler_t __handler)),
88 # define signal __sysv_signal
93 /* The X/Open definition of `signal' conflicts with the BSD version.
94 So they defined another function `bsd_signal'. */
95 extern __sighandler_t bsd_signal __P ((int __sig, __sighandler_t __handler));
98 /* Send signal SIG to process number PID. If PID is zero,
99 send SIG to all processes in the current process's process group.
100 If PID is < -1, send SIG to all processes in process group - PID. */
102 extern int kill __P ((__pid_t __pid, int __sig));
103 #endif /* Use POSIX. */
105 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
106 /* Send SIG to all processes in process group PGRP.
107 If PGRP is zero, send SIG to all processes in
108 the current process's process group. */
109 extern int killpg __P ((__pid_t __pgrp, int __sig));
110 #endif /* Use BSD || X/Open Unix. */
112 /* Raise signal SIG, i.e., send SIG to yourself. */
113 extern int raise __P ((int __sig));
116 /* SVID names for the same things. */
117 extern __sighandler_t ssignal __P ((int __sig, __sighandler_t __handler));
118 extern int gsignal __P ((int __sig));
119 #endif /* Use SVID. */
122 /* Print a message describing the meaning of the given signal number. */
123 extern void psignal __P ((int __sig, __const char *__s));
124 #endif /* Use misc. */
127 /* The `sigpause' function has two different interfaces. The original
128 BSD definition defines the argument as a mask of the signal, while
129 the more modern interface in X/Open defines it as the signal
130 number. We go with the BSD version unless the user explicitly
131 selects the X/Open version. */
132 extern int __sigpause __P ((int __sig_or_mask, int __is_sig));
135 /* Set the mask of blocked signals to MASK,
136 wait for a signal to arrive, and then restore the mask. */
137 extern int sigpause __P ((int __mask));
138 # define sigpause(mask) __sigpause ((mask), 0)
141 /* Remove a signal from the signal mask and suspend the process. */
142 # define sigpause(sig) __sigpause ((sig), 1)
148 /* None of the following functions should be used anymore. They are here
149 only for compatibility. A single word (`int') is not guaranteed to be
150 enough to hold a complete signal mask and therefore these functions
151 simply do not work in many situations. Use `sigprocmask' instead. */
153 /* Compute mask for signal SIG. */
154 # define sigmask(sig) __sigmask(sig)
156 /* Block signals in MASK, returning the old mask. */
157 extern int sigblock __P ((int __mask));
159 /* Set the mask of blocked signals to MASK, returning the old mask. */
160 extern int sigsetmask __P ((int __mask));
162 /* Return currently selected signal mask. */
163 extern int siggetmask __P ((void));
164 #endif /* Use BSD. */
172 typedef __sighandler_t sighandler_t;
175 /* 4.4 BSD uses the name `sig_t' for this. */
177 typedef __sighandler_t sig_t;
182 /* We need `struct timespec' later on. */
183 # define __need_timespec
186 /* Get the `siginfo_t' type plus the needed symbols. */
187 # include <bits/siginfo.h>
189 /* Clear all signals from SET. */
190 extern int sigemptyset __P ((sigset_t *__set));
192 /* Set all signals in SET. */
193 extern int sigfillset __P ((sigset_t *__set));
195 /* Add SIGNO to SET. */
196 extern int sigaddset __P ((sigset_t *__set, int __signo));
198 /* Remove SIGNO from SET. */
199 extern int sigdelset __P ((sigset_t *__set, int __signo));
201 /* Return 1 if SIGNO is in SET, 0 if not. */
202 extern int sigismember __P ((__const sigset_t *__set, int __signo));
205 /* Return non-empty value is SET is not empty. */
206 extern int sigisemptyset __P ((__const sigset_t *__set));
208 /* Build new signal set by combining the two inputs set using logical AND. */
209 extern int sigandset __P ((sigset_t *__set, __const sigset_t *__left,
210 __const sigset_t *__right));
212 /* Build new signal set by combining the two inputs set using logical OR. */
213 extern int sigorset __P ((sigset_t *__set, __const sigset_t *__left,
214 __const sigset_t *__right));
217 /* Get the system-specific definitions of `struct sigaction'
218 and the `SA_*' and `SIG_*'. constants. */
219 # include <bits/sigaction.h>
221 /* Get and/or change the set of blocked signals. */
222 extern int sigprocmask __P ((int __how,
223 __const sigset_t *__set, sigset_t *__oset));
225 /* Change the set of blocked signals to SET,
226 wait until a signal arrives, and restore the set of blocked signals. */
227 extern int sigsuspend __P ((__const sigset_t *__set));
229 /* Get and/or set the action for signal SIG. */
230 extern int __sigaction __P ((int __sig, __const struct sigaction *__act,
231 struct sigaction *__oact));
232 extern int sigaction __P ((int __sig, __const struct sigaction *__act,
233 struct sigaction *__oact));
235 /* Put in SET all signals that are blocked and waiting to be delivered. */
236 extern int sigpending __P ((sigset_t *__set));
239 /* Select any of pending signals from SET or wait for any to arrive. */
240 extern int sigwait __P ((__const sigset_t *__set, int *__sig));
242 /* Select any of pending signals from SET and place information in INFO. */
243 extern int sigwaitinfo __P ((__const sigset_t *__set, siginfo_t *__info));
245 /* Select any of pending signals from SET and place information in INFO.
246 Wait the imte specified by TIMEOUT if no signal is pending. */
247 extern int sigtimedwait __P ((__const sigset_t *__set, siginfo_t *__info,
248 __const struct timespec *__timeout));
250 /* Send signal SIG to the process PID. Associate data in VAL with the
252 extern int sigqueue __P ((__pid_t __pid, int __sig,
253 __const union sigval __val));
255 #endif /* Use POSIX. */
259 /* Names of the signals. This variable exists only for compatibility.
260 Use `strsignal' instead (see <string.h>). */
261 extern __const char *__const _sys_siglist[_NSIG];
262 extern __const char *__const sys_siglist[_NSIG];
264 /* Structure passed to `sigvec'. */
267 __sighandler_t sv_handler; /* Signal handler. */
268 int sv_mask; /* Mask of signals to be blocked. */
270 int sv_flags; /* Flags (see below). */
271 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
274 /* Bits in `sv_flags'. */
275 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
276 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
277 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
280 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
281 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
282 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
283 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
284 it is filled in with the old information for SIG. */
285 extern int sigvec __P ((int __sig, __const struct sigvec *__vec,
286 struct sigvec *__ovec));
289 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
290 # include <bits/sigcontext.h>
292 /* Restore the state saved in SCP. */
293 extern int sigreturn __P ((struct sigcontext *__scp));
295 #endif /* use BSD. */
298 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
300 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
301 (causing them to fail with EINTR); if INTERRUPT is zero, make system
302 calls be restarted after signal SIG. */
303 extern int siginterrupt __P ((int __sig, int __interrupt));
305 # include <bits/sigstack.h>
307 /* Run signals handlers on the stack specified by SS (if not NULL).
308 If OSS is not NULL, it is filled in with the old signal stack status.
309 This interface is obsolete and on many platform not implemented. */
310 extern int sigstack __P ((__const struct sigstack *__ss,
311 struct sigstack *__oss));
313 /* Alternate signal handler stack interface.
314 This interface should always be preferred over `sigstack'. */
315 extern int sigaltstack __P ((__const struct sigaltstack *__ss,
316 struct sigaltstack *__oss));
318 #endif /* use BSD or X/Open Unix. */
321 /* Simplified interface for signal management. */
323 /* Add SIG to the calling process' signal mask. */
324 extern int sighold __P ((int __sig));
326 /* Remove SIG from the calling process' signal mask. */
327 extern int sigrelse __P ((int __sig));
329 /* Set the disposition of SIG to SIG_IGN. */
330 extern int sigignore __P ((int __sig));
332 /* Set the disposition of SIG. */
333 extern __sighandler_t sigset __P ((int __sig, __sighandler_t __disp));
334 #endif /* use Unix98 */
337 /* Some of the functions for handling signals in threaded programs must
339 # include <bits/sigthread.h>
342 /* The following functions are used internally in the C library and in
343 other code which need deep insights. */
345 /* Return number of available real-time signal with highest priority. */
346 extern int __libc_current_sigrtmin __P ((void));
347 /* Return number of available real-time signal with lowest priority. */
348 extern int __libc_current_sigrtmax __P ((void));
350 /* Allocate real-time signal with highest/lowest available priority. */
351 extern int __libc_allocate_rtsig __P ((int __high));
353 #endif /* signal.h */
357 #endif /* not signal.h */