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glibc/signal/signal.h

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/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/*
* ISO C 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
#include <bits/types.h>
#include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
#if defined _SIGNAL_H && defined __USE_UNIX98 && !defined pid_t
typedef __pid_t pid_t;
# define pid_t pid_t
#endif /* Unix98 */
#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;
# define __sig_atomic_t_defined
#endif /* `sig_atomic_t' undefined and <signal.h> or need `sig_atomic_t'. */
#undef __need_sig_atomic_t
#ifdef _SIGNAL_H
#include <bits/signum.h>
/* Type of a signal handler. */
typedef void (*__sighandler_t) __P ((int));
/* The X/Open definition of `signal' specifies the SVID semantic. Use
the additional function `sysv_signal' when X/Open compatibility is
requested. */
extern __sighandler_t __sysv_signal __P ((int __sig,
__sighandler_t __handler));
/* Set the handler for the signal SIG to HANDLER, returning the old
handler, or SIG_ERR on error.
By default `signal' has the BSD semantic. */
#ifdef __USE_BSD
extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler));
#else
/* Make sure the used `signal' implementation is the SVID version.
When GNU CC is used we have a clean way to write this. */
# if defined __GNUC__ && __GNUC__ >= 2
extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler))
__asm__ ("__sysv_signal");
# else
# define signal(sig, handler) __sysv_signal ((sig), (handler))
# endif
#endif
#ifdef __USE_XOPEN
/* The X/Open definition of `signal' conflicts with the BSD version.
So they defined another function `bsd_signal'. */
extern __sighandler_t __bsd_signal __P ((int __sig, __sighandler_t __handler));
extern __sighandler_t bsd_signal __P ((int __sig, __sighandler_t __handler));
#endif
/* 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. */
#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
/* 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 || X/Open Unix. */
/* 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));
/* The `sigpause' function has two different interfaces. The original
BSD definition defines the argument as a mask of the signal, while
the more modern interface in X/Open defines it as the signal
number. We go with the BSD version unless the user explicitly
selects the X/Open version. */
extern int __sigpause __P ((int __sig_or_mask, int __is_sig));
#if defined __USE_BSD || defined __USE_GNU
/* 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));
# define sigpause(mask) __sigpause ((mask), 0)
#else
# ifdef __USE_XOPEN
/* Remove a signal from the signal mask and suspend the process. */
# define sigpause(sig) __sigpause ((sig), 1)
# endif
#endif
#ifdef __USE_BSD
# define sigmask(sig) __sigmask(sig)
extern int sigblock __P ((int __mask));
extern int sigsetmask __P ((int __mask));
/* This function is here only for compatibility.
Use `sigprocmask' instead. */
extern int siggetmask __P ((void));
#endif /* Use BSD. */
#ifdef __USE_MISC
# define NSIG _NSIG
#endif
#ifdef __USE_GNU
typedef __sighandler_t sighandler_t;
#endif
/* 4.4 BSD uses the name `sig_t' for this. */
#ifdef __USE_BSD
typedef __sighandler_t sig_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
/* We need `struct timespec' later on. */
# define __need_timespec
# include <time.h>
/* Get the `siginfo_t' type plus the needed symbols. */
# include <bits/siginfo.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 __USE_GNU
/* Return non-empty value is SET is not empty. */
extern int sigisemptyset __P ((__const sigset_t *__set));
/* Build new signal set by combining the two inputs set using logical AND. */
extern int sigandset __P ((sigset_t *__set, __const sigset_t *__left,
__const sigset_t *__right));
/* Build new signal set by combining the two inputs set using logical OR. */
extern int sigorset __P ((sigset_t *__set, __const sigset_t *__left,
__const sigset_t *__right));
# endif /* GNU */
/* Get the system-specific definitions of `struct sigaction'
and the `SA_*' and `SIG_*'. constants. */
# include <bits/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));
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));
/* Select any of pending signals from SET or wait for any to arrive. */
extern int __sigwait __P ((__const sigset_t *__set, int *__sig));
extern int sigwait __P ((__const sigset_t *__set, int *__sig));
/* Select any of pending signals from SET and place information in INFO. */
extern int __sigwaitinfo __P ((__const sigset_t *__set, siginfo_t *__info));
extern int sigwaitinfo __P ((__const sigset_t *__set, siginfo_t *__info));
/* Select any of pending signals from SET and place information in INFO.
Wait the imte specified by TIMEOUT if no signal is pending. */
extern int __sigtimedwait __P ((__const sigset_t *__set, siginfo_t *__info,
__const struct timespec *__timeout));
extern int sigtimedwait __P ((__const sigset_t *__set, siginfo_t *__info,
__const struct timespec *__timeout));
/* Send signal SIG to the process PID. Associate data in VAL with the
signal. */
extern int __sigqueue __P ((__pid_t __pid, int __sig,
__const union sigval __val));
extern int sigqueue __P ((__pid_t __pid, int __sig,
__const union sigval __val));
# endif /* <signal.h> included. */
#endif /* Use POSIX. */
#if defined _SIGNAL_H && defined __USE_BSD
/* Names of the signals. This variable exists only for compatibility.
Use `strsignal' instead (see <string.h>). */
extern __const char *__const _sys_siglist[_NSIG];
extern __const char *__const sys_siglist[_NSIG];
/* 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));
/* Get machine-dependent `struct sigcontext' and signal subcodes. */
# include <bits/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. */
#if defined _SIGNAL_H && (defined __USE_BSD || defined __USE_XOPEN_EXTENDED)
# define __need_size_t
# include <stddef.h>
/* 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. */
typedef struct sigaltstack
{
__ptr_t ss_sp;
size_t ss_size;
int ss_flags;
} stack_t;
extern int sigaltstack __P ((__const struct sigaltstack *__ss,
struct sigaltstack *__oss));
#endif /* signal.h included and use BSD or X/Open Unix. */
/* The following functions are used internally in the C library and in
other code which need deep insights. */
/* Return number of available real-time signal with highest priority. */
extern int __libc_current_sigrtmin __P ((void));
/* Return number of available real-time signal with lowest priority. */
extern int __libc_current_sigrtmax __P ((void));
/* Allocate real-time signal with highest/lowest available priority. */
extern int __libc_allocate_rtsig __P ((int __high));
__END_DECLS
#endif /* signal.h */
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