1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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
27 # include <features.h>
32 #include <bits/types.h>
33 #include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
35 #if defined _SIGNAL_H && defined __USE_UNIX98 && !defined pid_t
36 typedef __pid_t pid_t;
40 #if !defined __sig_atomic_t_defined \
41 && (defined _SIGNAL_H || defined __need_sig_atomic_t)
42 /* An integral type that can be modified atomically, without the
43 possibility of a signal arriving in the middle of the operation. */
44 typedef __sig_atomic_t sig_atomic_t;
45 # define __sig_atomic_t_defined
46 #endif /* `sig_atomic_t' undefined and <signal.h> or need `sig_atomic_t'. */
47 #undef __need_sig_atomic_t
51 #include <bits/signum.h>
53 /* Type of a signal handler. */
54 typedef void (*__sighandler_t) __P ((int));
56 /* The X/Open definition of `signal' specifies the SVID semantic. Use
57 the additional function `sysv_signal' when X/Open compatibility is
59 extern __sighandler_t __sysv_signal __P ((int __sig,
60 __sighandler_t __handler));
62 /* Set the handler for the signal SIG to HANDLER, returning the old
63 handler, or SIG_ERR on error.
64 By default `signal' has the BSD semantic. */
66 extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler));
68 /* Make sure the used `signal' implementation is the SVID version.
69 When GNU CC is used we have a clean way to write this. */
70 # if defined __GNUC__ && __GNUC__ >= 2
71 extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler))
72 __asm__ ("__sysv_signal");
74 # define signal(sig, handler) __sysv_signal ((sig), (handler))
79 /* The X/Open definition of `signal' conflicts with the BSD version.
80 So they defined another function `bsd_signal'. */
81 extern __sighandler_t __bsd_signal __P ((int __sig, __sighandler_t __handler));
82 extern __sighandler_t bsd_signal __P ((int __sig, __sighandler_t __handler));
85 /* Send signal SIG to process number PID. If PID is zero,
86 send SIG to all processes in the current process's process group.
87 If PID is < -1, send SIG to all processes in process group - PID. */
88 extern int __kill __P ((__pid_t __pid, int __sig));
90 extern int kill __P ((__pid_t __pid, int __sig));
91 #endif /* Use POSIX. */
93 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
94 /* Send SIG to all processes in process group PGRP.
95 If PGRP is zero, send SIG to all processes in
96 the current process's process group. */
97 extern int killpg __P ((__pid_t __pgrp, int __sig));
98 #endif /* Use BSD || X/Open Unix. */
100 /* Raise signal SIG, i.e., send SIG to yourself. */
101 extern int raise __P ((int __sig));
104 /* SVID names for the same things. */
105 extern __sighandler_t ssignal __P ((int __sig, __sighandler_t __handler));
106 extern int gsignal __P ((int __sig));
107 #endif /* Use SVID. */
110 /* Print a message describing the meaning of the given signal number. */
111 extern void psignal __P ((int __sig, __const char *__s));
112 #endif /* Use misc. */
115 /* Block signals in MASK, returning the old mask. */
116 extern int __sigblock __P ((int __mask));
118 /* Set the mask of blocked signals to MASK, returning the old mask. */
119 extern int __sigsetmask __P ((int __mask));
122 /* The `sigpause' function has two different interfaces. The original
123 BSD definition defines the argument as a mask of the signal, while
124 the more modern interface in X/Open defines it as the signal
125 number. We go with the BSD version unless the user explicitly
126 selects the X/Open version. */
127 extern int __sigpause __P ((int __sig_or_mask, int __is_sig));
129 #if defined __USE_BSD || defined __USE_GNU
130 /* Set the mask of blocked signals to MASK,
131 wait for a signal to arrive, and then restore the mask. */
132 extern int sigpause __P ((int __mask));
133 # define sigpause(mask) __sigpause ((mask), 0)
136 /* Remove a signal from the signal mask and suspend the process. */
137 # define sigpause(sig) __sigpause ((sig), 1)
143 # define sigmask(sig) __sigmask(sig)
145 extern int sigblock __P ((int __mask));
146 extern int sigsetmask __P ((int __mask));
148 /* This function is here only for compatibility.
149 Use `sigprocmask' instead. */
150 extern int siggetmask __P ((void));
151 #endif /* Use BSD. */
159 typedef __sighandler_t sighandler_t;
162 /* 4.4 BSD uses the name `sig_t' for this. */
164 typedef __sighandler_t sig_t;
167 #endif /* <signal.h> included. */
172 # if !defined __sigset_t_defined \
173 && (defined _SIGNAL_H || defined __need_sigset_t)
174 typedef __sigset_t sigset_t;
175 # define __sigset_t_defined 1
176 # endif /* `sigset_t' not defined and <signal.h> or need `sigset_t'. */
177 # undef __need_sigset_t
181 /* We need `struct timespec' later on. */
182 # define __need_timespec
185 /* Get the `siginfo_t' type plus the needed symbols. */
186 # include <bits/siginfo.h>
188 /* Clear all signals from SET. */
189 extern int sigemptyset __P ((sigset_t *__set));
191 /* Set all signals in SET. */
192 extern int sigfillset __P ((sigset_t *__set));
194 /* Add SIGNO to SET. */
195 extern int sigaddset __P ((sigset_t *__set, int __signo));
197 /* Remove SIGNO from SET. */
198 extern int sigdelset __P ((sigset_t *__set, int __signo));
200 /* Return 1 if SIGNO is in SET, 0 if not. */
201 extern int sigismember __P ((__const sigset_t *__set, int __signo));
204 /* Return non-empty value is SET is not empty. */
205 extern int sigisemptyset __P ((__const sigset_t *__set));
207 /* Build new signal set by combining the two inputs set using logical AND. */
208 extern int sigandset __P ((sigset_t *__set, __const sigset_t *__left,
209 __const sigset_t *__right));
211 /* Build new signal set by combining the two inputs set using logical OR. */
212 extern int sigorset __P ((sigset_t *__set, __const sigset_t *__left,
213 __const sigset_t *__right));
216 /* Get the system-specific definitions of `struct sigaction'
217 and the `SA_*' and `SIG_*'. constants. */
218 # include <bits/sigaction.h>
220 /* Get and/or change the set of blocked signals. */
221 extern int __sigprocmask __P ((int __how,
222 __const sigset_t *__set, sigset_t *__oset));
223 extern int sigprocmask __P ((int __how,
224 __const sigset_t *__set, sigset_t *__oset));
226 /* Change the set of blocked signals to SET,
227 wait until a signal arrives, and restore the set of blocked signals. */
228 extern int __sigsuspend __P ((__const sigset_t *__set));
229 extern int sigsuspend __P ((__const sigset_t *__set));
231 /* Get and/or set the action for signal SIG. */
232 extern int __sigaction __P ((int __sig, __const struct sigaction *__act,
233 struct sigaction *__oact));
234 extern int sigaction __P ((int __sig, __const struct sigaction *__act,
235 struct sigaction *__oact));
237 /* Put in SET all signals that are blocked and waiting to be delivered. */
238 extern int sigpending __P ((sigset_t *__set));
241 /* Select any of pending signals from SET or wait for any to arrive. */
242 extern int __sigwait __P ((__const sigset_t *__set, int *__sig));
243 extern int sigwait __P ((__const sigset_t *__set, int *__sig));
245 /* Select any of pending signals from SET and place information in INFO. */
246 extern int __sigwaitinfo __P ((__const sigset_t *__set, siginfo_t *__info));
247 extern int sigwaitinfo __P ((__const sigset_t *__set, siginfo_t *__info));
249 /* Select any of pending signals from SET and place information in INFO.
250 Wait the imte specified by TIMEOUT if no signal is pending. */
251 extern int __sigtimedwait __P ((__const sigset_t *__set, siginfo_t *__info,
252 __const struct timespec *__timeout));
253 extern int sigtimedwait __P ((__const sigset_t *__set, siginfo_t *__info,
254 __const struct timespec *__timeout));
256 /* Send signal SIG to the process PID. Associate data in VAL with the
258 extern int __sigqueue __P ((__pid_t __pid, int __sig,
259 __const union sigval __val));
260 extern int sigqueue __P ((__pid_t __pid, int __sig,
261 __const union sigval __val));
263 # endif /* <signal.h> included. */
265 #endif /* Use POSIX. */
267 #if defined _SIGNAL_H && defined __USE_BSD
269 /* Names of the signals. This variable exists only for compatibility.
270 Use `strsignal' instead (see <string.h>). */
271 extern __const char *__const _sys_siglist[_NSIG];
272 extern __const char *__const sys_siglist[_NSIG];
274 /* Structure passed to `sigvec'. */
277 __sighandler_t sv_handler; /* Signal handler. */
278 int sv_mask; /* Mask of signals to be blocked. */
280 int sv_flags; /* Flags (see below). */
281 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
284 /* Bits in `sv_flags'. */
285 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
286 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
287 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
290 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
291 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
292 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
293 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
294 it is filled in with the old information for SIG. */
295 extern int __sigvec __P ((int __sig, __const struct sigvec *__vec,
296 struct sigvec *__ovec));
297 extern int sigvec __P ((int __sig, __const struct sigvec *__vec,
298 struct sigvec *__ovec));
301 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
302 # include <bits/sigcontext.h>
304 /* Restore the state saved in SCP. */
305 extern int __sigreturn __P ((struct sigcontext *__scp));
306 extern int sigreturn __P ((struct sigcontext *__scp));
308 #endif /* signal.h included and use BSD. */
311 #if defined _SIGNAL_H && (defined __USE_BSD || defined __USE_XOPEN_EXTENDED)
313 # define __need_size_t
316 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
317 (causing them to fail with EINTR); if INTERRUPT is zero, make system
318 calls be restarted after signal SIG. */
319 extern int siginterrupt __P ((int __sig, int __interrupt));
322 /* Structure describing a signal stack. */
325 __ptr_t ss_sp; /* Signal stack pointer. */
326 int ss_onstack; /* Nonzero if executing on this stack. */
329 /* Run signals handlers on the stack specified by SS (if not NULL).
330 If OSS is not NULL, it is filled in with the old signal stack status. */
331 extern int sigstack __P ((__const struct sigstack *__ss,
332 struct sigstack *__oss));
334 /* Alternate interface. */
335 typedef struct sigaltstack
342 extern int sigaltstack __P ((__const struct sigaltstack *__ss,
343 struct sigaltstack *__oss));
345 #endif /* signal.h included and use BSD or X/Open Unix. */
348 /* The following functions are used internally in the C library and in
349 other code which need deep insights. */
351 /* Return number of available real-time signal with highest priority. */
352 extern int __libc_current_sigrtmin __P ((void));
353 /* Return number of available real-time signal with lowest priority. */
354 extern int __libc_current_sigrtmax __P ((void));
356 /* Allocate real-time signal with highest/lowest available priority. */
357 extern int __libc_allocate_rtsig __P ((int __high));
361 #endif /* signal.h */