/* Copyright (C) 1991-2018 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

   <http://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