1 /* Copyright (C) 1991, 92, 93, 94, 95, 96 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
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
20 * ANSI Standard: 4.7 SIGNAL HANDLING <signal.h>
25 #if !defined(__need_sig_atomic_t) && !defined(__need_sigset_t)
35 #include <gnu/types.h>
36 #include <sigset.h> /* __sigset_t, __sig_atomic_t. */
38 #if !defined(__sig_atomic_t_defined) && \
39 (defined(_SIGNAL_H) || defined(__need_sig_atomic_t))
40 /* An integral type that can be modified atomically, without the
41 possibility of a signal arriving in the middle of the operation. */
42 typedef __sig_atomic_t sig_atomic_t;
43 #endif /* `sig_atomic_t' undefined and <signal.h> or need `sig_atomic_t'. */
44 #undef __need_sig_atomic_t
50 /* Type of a signal handler. */
51 typedef void (*__sighandler_t) __P ((int));
53 /* Set the handler for the signal SIG to HANDLER,
54 returning the old handler, or SIG_ERR on error. */
55 extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler));
57 /* Send signal SIG to process number PID. If PID is zero,
58 send SIG to all processes in the current process's process group.
59 If PID is < -1, send SIG to all processes in process group - PID. */
60 extern int __kill __P ((__pid_t __pid, int __sig));
62 extern int kill __P ((__pid_t __pid, int __sig));
63 #endif /* Use POSIX. */
66 /* Send SIG to all processes in process group PGRP.
67 If PGRP is zero, send SIG to all processes in
68 the current process's process group. */
69 extern int killpg __P ((__pid_t __pgrp, int __sig));
72 /* Raise signal SIG, i.e., send SIG to yourself. */
73 extern int raise __P ((int __sig));
76 /* SVID names for the same things. */
77 extern __sighandler_t ssignal __P ((int __sig, __sighandler_t __handler));
78 extern int gsignal __P ((int __sig));
79 #endif /* Use SVID. */
82 /* Print a message describing the meaning of the given signal number. */
83 extern void psignal __P ((int __sig, __const char *__s));
84 #endif /* Use misc. */
87 /* Block signals in MASK, returning the old mask. */
88 extern int __sigblock __P ((int __mask));
90 /* Set the mask of blocked signals to MASK, returning the old mask. */
91 extern int __sigsetmask __P ((int __mask));
93 /* Set the mask of blocked signals to MASK,
94 wait for a signal to arrive, and then restore the mask. */
95 extern int __sigpause __P ((int __mask));
98 #define sigmask(sig) __sigmask(sig)
100 extern int sigblock __P ((int __mask));
101 extern int sigsetmask __P ((int __mask));
102 extern int sigpause __P ((int __mask));
103 #endif /* Use BSD. */
111 typedef __sighandler_t sighandler_t;
114 /* 4.4 BSD uses the name `sig_t' for this. */
116 typedef __sighandler_t sig_t;
119 #endif /* <signal.h> included. */
124 #if !defined(__sigset_t_defined) && \
125 (defined(_SIGNAL_H) || defined(__need_sigset_t))
126 typedef __sigset_t sigset_t;
127 #define __sigset_t_defined 1
128 #endif /* `sigset_t' not defined and <signal.h> or need `sigset_t'. */
129 #undef __need_sigset_t
133 /* Clear all signals from SET. */
134 extern int sigemptyset __P ((sigset_t *__set));
136 /* Set all signals in SET. */
137 extern int sigfillset __P ((sigset_t *__set));
139 /* Add SIGNO to SET. */
140 extern int sigaddset __P ((sigset_t *__set, int __signo));
142 /* Remove SIGNO from SET. */
143 extern int sigdelset __P ((sigset_t *__set, int __signo));
145 /* Return 1 if SIGNO is in SET, 0 if not. */
146 extern int sigismember __P ((__const sigset_t *__set, int signo));
149 /* <sigset.h> defines the __ versions as macros that do the work. */
150 #define sigemptyset(set) __sigemptyset(set)
151 #define sigfillset(set) __sigfillset(set)
152 #define sigaddset(set, signo) __sigaddset(set, signo)
153 #define sigdelset(set, signo) __sigdelset(set, signo)
154 #define sigismember(set, signo) __sigismember(set, signo)
157 /* Get the system-specific definitions of `struct sigaction'
158 and the `SA_*' and `SIG_*'. constants. */
159 #include <sigaction.h>
161 /* Get and/or change the set of blocked signals. */
162 extern int __sigprocmask __P ((int __how,
163 __const sigset_t *__set, sigset_t *__oset));
164 extern int sigprocmask __P ((int __how,
165 __const sigset_t *__set, sigset_t *__oset));
167 /* Change the set of blocked signals to SET,
168 wait until a signal arrives, and restore the set of blocked signals. */
169 extern int sigsuspend __P ((__const sigset_t *__set));
171 /* Get and/or set the action for signal SIG. */
172 extern int __sigaction __P ((int __sig, __const struct sigaction *__act,
173 struct sigaction *__oact));
174 extern int sigaction __P ((int __sig, __const struct sigaction *__act,
175 struct sigaction *__oact));
177 /* Put in SET all signals that are blocked and waiting to be delivered. */
178 extern int sigpending __P ((sigset_t *__set));
181 /* Select any of pending signals from SET or wait for any to arrive. */
182 extern int __sigwait __P ((__const sigset_t *__set, int *__sig));
183 extern int sigwait __P ((__const sigset_t *__set, int *__sig));
185 #endif /* <signal.h> included. */
187 #endif /* Use POSIX. */
189 #if defined(_SIGNAL_H) && defined(__USE_BSD)
191 /* Names of the signals. This variable exists only for compatiblity.
192 Use `strsignal' instead (see <string.h>). */
193 extern __const char *__const _sys_siglist[NSIG];
194 extern __const char *__const sys_siglist[NSIG];
196 /* Structure passed to `sigvec'. */
199 __sighandler_t sv_handler; /* Signal handler. */
200 int sv_mask; /* Mask of signals to be blocked. */
202 int sv_flags; /* Flags (see below). */
203 #define sv_onstack sv_flags /* 4.2 BSD compatibility. */
206 /* Bits in `sv_flags'. */
207 #define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
208 #define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
209 #define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
212 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
213 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
214 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
215 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
216 it is filled in with the old information for SIG. */
217 extern int __sigvec __P ((int __sig, __const struct sigvec *__vec,
218 struct sigvec *__ovec));
219 extern int sigvec __P ((int __sig, __const struct sigvec *__vec,
220 struct sigvec *__ovec));
223 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
224 (causing them to fail with EINTR); if INTERRUPT is zero, make system
225 calls be restarted after signal SIG. */
226 extern int siginterrupt __P ((int __sig, int __interrupt));
229 /* Structure describing a signal stack. */
232 __ptr_t ss_sp; /* Signal stack pointer. */
233 int ss_onstack; /* Nonzero if executing on this stack. */
236 /* Run signals handlers on the stack specified by SS (if not NULL).
237 If OSS is not NULL, it is filled in with the old signal stack status. */
238 extern int sigstack __P ((__const struct sigstack *__ss,
239 struct sigstack *__oss));
241 /* Alternate interface. */
249 extern int sigaltstack __P ((__const struct sigaltstack *__ss,
250 struct sigaltstack *__oss));
252 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
253 #include <sigcontext.h>
255 /* Restore the state saved in SCP. */
256 extern int __sigreturn __P ((struct sigcontext *__scp));
257 extern int sigreturn __P ((struct sigcontext *__scp));
259 #endif /* signal.h included and use BSD. */
263 #endif /* signal.h */