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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /signal/signal.h
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initial import
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diff --git a/signal/signal.h b/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 */