259 lines
8.1 KiB
C
259 lines
8.1 KiB
C
/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/*
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* ANSI Standard: 4.7 SIGNAL HANDLING <signal.h>
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*/
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#ifndef _SIGNAL_H
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#if !defined(__need_sig_atomic_t) && !defined(__need_sigset_t)
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#define _SIGNAL_H 1
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#include <features.h>
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#endif
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__BEGIN_DECLS
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#define __need_size_t
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#include <stddef.h>
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#include <gnu/types.h>
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#include <sigset.h> /* __sigset_t, __sig_atomic_t. */
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#if !defined(__sig_atomic_t_defined) && \
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(defined(_SIGNAL_H) || defined(__need_sig_atomic_t))
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/* An integral type that can be modified atomically, without the
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possibility of a signal arriving in the middle of the operation. */
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typedef __sig_atomic_t sig_atomic_t;
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#endif /* `sig_atomic_t' undefined and <signal.h> or need `sig_atomic_t'. */
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#undef __need_sig_atomic_t
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#ifdef _SIGNAL_H
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#include <signum.h>
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/* Type of a signal handler. */
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typedef void (*__sighandler_t) __P ((int));
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/* Set the handler for the signal SIG to HANDLER,
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returning the old handler, or SIG_ERR on error. */
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extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler));
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/* Send signal SIG to process number PID. If PID is zero,
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send SIG to all processes in the current process's process group.
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If PID is < -1, send SIG to all processes in process group - PID. */
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extern int __kill __P ((__pid_t __pid, int __sig));
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#ifdef __USE_POSIX
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extern int kill __P ((__pid_t __pid, int __sig));
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#endif /* Use POSIX. */
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#ifdef __USE_BSD
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/* Send SIG to all processes in process group PGRP.
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If PGRP is zero, send SIG to all processes in
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the current process's process group. */
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extern int killpg __P ((__pid_t __pgrp, int __sig));
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#endif /* Use BSD. */
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/* Raise signal SIG, i.e., send SIG to yourself. */
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extern int raise __P ((int __sig));
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#ifdef __USE_SVID
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/* SVID names for the same things. */
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extern __sighandler_t ssignal __P ((int __sig, __sighandler_t __handler));
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extern int gsignal __P ((int __sig));
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#endif /* Use SVID. */
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#ifdef __USE_MISC
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/* Print a message describing the meaning of the given signal number. */
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extern void psignal __P ((int __sig, __const char *__s));
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#endif /* Use misc. */
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/* Block signals in MASK, returning the old mask. */
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extern int __sigblock __P ((int __mask));
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/* Set the mask of blocked signals to MASK, returning the old mask. */
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extern int __sigsetmask __P ((int __mask));
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/* Set the mask of blocked signals to MASK,
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wait for a signal to arrive, and then restore the mask. */
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extern int __sigpause __P ((int __mask));
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#ifdef __USE_BSD
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#define sigmask(sig) __sigmask(sig)
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extern int sigblock __P ((int __mask));
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extern int sigsetmask __P ((int __mask));
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extern int sigpause __P ((int __mask));
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#endif /* Use BSD. */
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#ifdef __USE_MISC
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#define NSIG _NSIG
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#endif
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#ifdef __USE_GNU
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typedef __sighandler_t sighandler_t;
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#endif
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/* 4.4 BSD uses the name `sig_t' for this. */
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#ifdef __USE_BSD
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typedef __sighandler_t sig_t;
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#endif
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#endif /* <signal.h> included. */
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#ifdef __USE_POSIX
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#if !defined(__sigset_t_defined) && \
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(defined(_SIGNAL_H) || defined(__need_sigset_t))
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typedef __sigset_t sigset_t;
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#define __sigset_t_defined 1
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#endif /* `sigset_t' not defined and <signal.h> or need `sigset_t'. */
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#undef __need_sigset_t
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#ifdef _SIGNAL_H
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/* Clear all signals from SET. */
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extern int sigemptyset __P ((sigset_t *__set));
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/* Set all signals in SET. */
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extern int sigfillset __P ((sigset_t *__set));
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/* Add SIGNO to SET. */
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extern int sigaddset __P ((sigset_t *__set, int __signo));
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/* Remove SIGNO from SET. */
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extern int sigdelset __P ((sigset_t *__set, int __signo));
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/* Return 1 if SIGNO is in SET, 0 if not. */
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extern int sigismember __P ((__const sigset_t *__set, int signo));
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#ifdef __OPTIMIZE__
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/* <sigset.h> defines the __ versions as macros that do the work. */
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#define sigemptyset(set) __sigemptyset(set)
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#define sigfillset(set) __sigfillset(set)
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#define sigaddset(set, signo) __sigaddset(set, signo)
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#define sigdelset(set, signo) __sigdelset(set, signo)
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#define sigismember(set, signo) __sigismember(set, signo)
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#endif
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/* Get the system-specific definitions of `struct sigaction'
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and the `SA_*' and `SIG_*'. constants. */
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#include <sigaction.h>
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/* Get and/or change the set of blocked signals. */
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extern int __sigprocmask __P ((int __how,
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__const sigset_t *__set, sigset_t *__oset));
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extern int sigprocmask __P ((int __how,
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__const sigset_t *__set, sigset_t *__oset));
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/* Change the set of blocked signals to SET,
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wait until a signal arrives, and restore the set of blocked signals. */
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extern int sigsuspend __P ((__const sigset_t *__set));
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/* Get and/or set the action for signal SIG. */
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extern int __sigaction __P ((int __sig, __const struct sigaction *__act,
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struct sigaction *__oact));
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extern int sigaction __P ((int __sig, __const struct sigaction *__act,
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struct sigaction *__oact));
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/* Put in SET all signals that are blocked and waiting to be delivered. */
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extern int sigpending __P ((sigset_t *__set));
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#endif /* <signal.h> included. */
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#endif /* Use POSIX. */
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#if defined(_SIGNAL_H) && defined(__USE_BSD)
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/* Names of the signals. This variable exists only for compatiblity.
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Use `strsignal' instead (see <string.h>). */
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extern __const char *__const _sys_siglist[NSIG];
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extern __const char *__const sys_siglist[NSIG];
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/* Structure passed to `sigvec'. */
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struct sigvec
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{
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__sighandler_t sv_handler; /* Signal handler. */
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int sv_mask; /* Mask of signals to be blocked. */
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int sv_flags; /* Flags (see below). */
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#define sv_onstack sv_flags /* 4.2 BSD compatibility. */
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};
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/* Bits in `sv_flags'. */
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#define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
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#define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
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#define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
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/* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
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of VEC. The signals in `sv_mask' will be blocked while the handler runs.
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If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
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reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
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it is filled in with the old information for SIG. */
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extern int __sigvec __P ((int __sig, __const struct sigvec *__vec,
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struct sigvec *__ovec));
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extern int sigvec __P ((int __sig, __const struct sigvec *__vec,
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struct sigvec *__ovec));
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/* If INTERRUPT is nonzero, make signal SIG interrupt system calls
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(causing them to fail with EINTR); if INTERRUPT is zero, make system
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calls be restarted after signal SIG. */
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extern int siginterrupt __P ((int __sig, int __interrupt));
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/* Structure describing a signal stack. */
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struct sigstack
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{
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__ptr_t ss_sp; /* Signal stack pointer. */
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int ss_onstack; /* Nonzero if executing on this stack. */
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};
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/* Run signals handlers on the stack specified by SS (if not NULL).
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If OSS is not NULL, it is filled in with the old signal stack status. */
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extern int sigstack __P ((__const struct sigstack *__ss,
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struct sigstack *__oss));
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/* Alternate interface. */
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struct sigaltstack
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{
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__ptr_t ss_sp;
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size_t ss_size;
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int ss_flags;
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};
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extern int sigaltstack __P ((__const struct sigaltstack *__ss,
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struct sigaltstack *__oss));
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/* Get machine-dependent `struct sigcontext' and signal subcodes. */
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#include <sigcontext.h>
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/* Restore the state saved in SCP. */
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extern int __sigreturn __P ((struct sigcontext *__scp));
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extern int sigreturn __P ((struct sigcontext *__scp));
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#endif /* signal.h included and use BSD. */
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__END_DECLS
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#endif /* signal.h */
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