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/* Copyright (C) 1991-2020 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _BITS_SIGACTION_H
#define _BITS_SIGACTION_H 1
#ifndef _SIGNAL_H
# error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
#endif
/* These definitions match those used by the 4.4 BSD kernel.
If the operating system has a `sigaction' system call that correctly
implements the POSIX.1 behavior, there should be a system-dependent
version of this file that defines `struct sigaction' and the `SA_*'
constants appropriately. */
/* Structure describing the action to be taken when a signal arrives. */
struct sigaction
{
/* Signal handler. */
#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
union
{
/* Used if SA_SIGINFO is not set. */
__sighandler_t sa_handler;
/* Used if SA_SIGINFO is set. */
void (*sa_sigaction) (int, siginfo_t *, void *);
}
__sigaction_handler;
# define sa_handler __sigaction_handler.sa_handler
# define sa_sigaction __sigaction_handler.sa_sigaction
#else
__sighandler_t sa_handler;
#endif
/* Additional set of signals to be blocked. */
__sigset_t sa_mask;
/* Special flags. */
int sa_flags;
};
/* Bits in `sa_flags'. */
#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
# define SA_ONSTACK 0x0001 /* Take signal on signal stack. */
#endif
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
# define SA_RESTART 0x0002 /* Restart syscall on signal return. */
# define SA_NODEFER 0x0010 /* Don't automatically block the signal when
its handler is being executed. */
# define SA_RESETHAND 0x0004 /* Reset to SIG_DFL on entry to handler. */
#endif
#define SA_NOCLDSTOP 0x0008 /* Don't send SIGCHLD when children stop. */
#ifdef __USE_MISC
# define SA_INTERRUPT 0 /* Historical no-op ("not SA_RESTART"). */
/* Some aliases for the SA_ constants. */
# define SA_NOMASK SA_NODEFER
# define SA_ONESHOT SA_RESETHAND
# define SA_STACK SA_ONSTACK
#endif
/* Values for the HOW argument to `sigprocmask'. */
#define SIG_BLOCK 1 /* Block signals. */
#define SIG_UNBLOCK 2 /* Unblock signals. */
#define SIG_SETMASK 3 /* Set the set of blocked signals. */
#endif
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