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glibc/signal/signal.h

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/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/*
* ANSI Standard: 4.7 SIGNAL HANDLING <signal.h>
*/
#ifndef _SIGNAL_H
#if !defined(__need_sig_atomic_t) && !defined(__need_sigset_t)
#define _SIGNAL_H 1
#include <features.h>
#endif
__BEGIN_DECLS
#define __need_size_t
#include <stddef.h>
#include <gnu/types.h>
#include <sigset.h> /* __sigset_t, __sig_atomic_t. */
#if !defined(__sig_atomic_t_defined) && \
(defined(_SIGNAL_H) || defined(__need_sig_atomic_t))
/* An integral type that can be modified atomically, without the
possibility of a signal arriving in the middle of the operation. */
typedef __sig_atomic_t sig_atomic_t;
#endif /* `sig_atomic_t' undefined and <signal.h> or need `sig_atomic_t'. */
#undef __need_sig_atomic_t
#ifdef _SIGNAL_H
#include <signum.h>
/* Type of a signal handler. */
typedef void (*__sighandler_t) __P ((int));
/* Set the handler for the signal SIG to HANDLER,
returning the old handler, or SIG_ERR on error. */
extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler));
/* Send signal SIG to process number PID. If PID is zero,
send SIG to all processes in the current process's process group.
If PID is < -1, send SIG to all processes in process group - PID. */
extern int __kill __P ((__pid_t __pid, int __sig));
#ifdef __USE_POSIX
extern int kill __P ((__pid_t __pid, int __sig));
#endif /* Use POSIX. */
#ifdef __USE_BSD
/* Send SIG to all processes in process group PGRP.
If PGRP is zero, send SIG to all processes in
the current process's process group. */
extern int killpg __P ((__pid_t __pgrp, int __sig));
#endif /* Use BSD. */
/* Raise signal SIG, i.e., send SIG to yourself. */
extern int raise __P ((int __sig));
#ifdef __USE_SVID
/* SVID names for the same things. */
extern __sighandler_t ssignal __P ((int __sig, __sighandler_t __handler));
extern int gsignal __P ((int __sig));
#endif /* Use SVID. */
#ifdef __USE_MISC
/* Print a message describing the meaning of the given signal number. */
extern void psignal __P ((int __sig, __const char *__s));
#endif /* Use misc. */
/* Block signals in MASK, returning the old mask. */
extern int __sigblock __P ((int __mask));
/* Set the mask of blocked signals to MASK, returning the old mask. */
extern int __sigsetmask __P ((int __mask));
/* Set the mask of blocked signals to MASK,
wait for a signal to arrive, and then restore the mask. */
extern int __sigpause __P ((int __mask));
#ifdef __USE_BSD
#define sigmask(sig) __sigmask(sig)
extern int sigblock __P ((int __mask));
extern int sigsetmask __P ((int __mask));
extern int sigpause __P ((int __mask));
#endif /* Use BSD. */
#ifdef __USE_MISC
#define NSIG _NSIG
#endif
#ifdef __USE_GNU
typedef __sighandler_t sighandler_t;
#endif
#endif /* <signal.h> included. */
#ifdef __USE_POSIX
#if !defined(__sigset_t_defined) && \
(defined(_SIGNAL_H) || defined(__need_sigset_t))
typedef __sigset_t sigset_t;
#define __sigset_t_defined 1
#endif /* `sigset_t' not defined and <signal.h> or need `sigset_t'. */
#undef __need_sigset_t
#ifdef _SIGNAL_H
/* Clear all signals from SET. */
extern int sigemptyset __P ((sigset_t *__set));
/* Set all signals in SET. */
extern int sigfillset __P ((sigset_t *__set));
/* Add SIGNO to SET. */
extern int sigaddset __P ((sigset_t *__set, int __signo));
/* Remove SIGNO from SET. */
extern int sigdelset __P ((sigset_t *__set, int __signo));
/* Return 1 if SIGNO is in SET, 0 if not. */
extern int sigismember __P ((__const sigset_t *__set, int signo));
#ifdef __OPTIMIZE__
/* <sigset.h> defines the __ versions as macros that do the work. */
#define sigemptyset(set) __sigemptyset(set)
#define sigfillset(set) __sigfillset(set)
#define sigaddset(set, signo) __sigaddset(set, signo)
#define sigdelset(set, signo) __sigdelset(set, signo)
#define sigismember(set, signo) __sigismember(set, signo)
#endif
/* Get the system-specific definitions of `struct sigaction'
and the `SA_*' and `SIG_*'. constants. */
#include <sigaction.h>
/* Get and/or change the set of blocked signals. */
extern int __sigprocmask __P ((int __how,
__const sigset_t *__set, sigset_t *__oset));
extern int sigprocmask __P ((int __how,
__const sigset_t *__set, sigset_t *__oset));
/* Change the set of blocked signals to SET,
wait until a signal arrives, and restore the set of blocked signals. */
extern int sigsuspend __P ((__const sigset_t *__set));
/* Get and/or set the action for signal SIG. */
extern int __sigaction __P ((int __sig, __const struct sigaction *__act,
struct sigaction *__oact));
extern int sigaction __P ((int __sig, __const struct sigaction *__act,
struct sigaction *__oact));
/* Put in SET all signals that are blocked and waiting to be delivered. */
extern int sigpending __P ((sigset_t *__set));
#endif /* <signal.h> included. */
#endif /* Use POSIX. */
#if defined(_SIGNAL_H) && defined(__USE_BSD)
/* Structure passed to `sigvec'. */
struct sigvec
{
__sighandler_t sv_handler; /* Signal handler. */
int sv_mask; /* Mask of signals to be blocked. */
int sv_flags; /* Flags (see below). */
#define sv_onstack sv_flags /* 4.2 BSD compatibility. */
};
/* Bits in `sv_flags'. */
#define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
#define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
#define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
/* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
of VEC. The signals in `sv_mask' will be blocked while the handler runs.
If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
it is filled in with the old information for SIG. */
extern int __sigvec __P ((int __sig, __const struct sigvec *__vec,
struct sigvec *__ovec));
extern int sigvec __P ((int __sig, __const struct sigvec *__vec,
struct sigvec *__ovec));
/* If INTERRUPT is nonzero, make signal SIG interrupt system calls
(causing them to fail with EINTR); if INTERRUPT is zero, make system
calls be restarted after signal SIG. */
extern int siginterrupt __P ((int __sig, int __interrupt));
/* Structure describing a signal stack. */
struct sigstack
{
__ptr_t ss_sp; /* Signal stack pointer. */
int ss_onstack; /* Nonzero if executing on this stack. */
};
/* Run signals handlers on the stack specified by SS (if not NULL).
If OSS is not NULL, it is filled in with the old signal stack status. */
extern int sigstack __P ((__const struct sigstack *__ss,
struct sigstack *__oss));
/* Alternate interface. */
struct sigaltstack
{
__ptr_t ss_sp;
size_t ss_size;
int ss_flags;
};
extern int sigaltstack __P ((__const struct sigaltstack *__ss,
struct sigaltstack *__oss));
/* Get machine-dependent `struct sigcontext' and signal subcodes. */
#include <sigcontext.h>
/* Restore the state saved in SCP. */
extern int __sigreturn __P ((struct sigcontext *__scp));
extern int sigreturn __P ((struct sigcontext *__scp));
#endif /* signal.h included and use BSD. */
__END_DECLS
#endif /* signal.h */
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