/* The proper definitions for Linux/Alpha sigaction.
   Copyright (C) 1996, 1997, 1999, 2000 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 _SIGNAL_H
# error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
#endif

/* Structure describing the action to be taken when a signal arrives.  */
struct sigaction {
#ifdef __USE_POSIX199309
	union {
		__sighandler_t sa_handler;
		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
	unsigned        sa_flags;
	sigset_t        sa_mask;
	/* Alpha has no sa_restorer field.  */
};

/* Bits in `sa_flags'.  */
#define	SA_NOCLDSTOP  0x00000004 /* Don't send SIGCHLD when children stop.  */
#define SA_NOCLDWAIT  0x00000020 /* Don't create zombie on child death.  */
#define SA_SIGINFO    0x00000040 /* Invoke signal-catching function with
				    three arguments instead of one.  */
#if defined __USE_UNIX98 || defined __USE_MISC
# define SA_ONSTACK   0x00000001 /* Use signal stack by using `sa_restorer'. */
# define SA_RESTART   0x00000002 /* Restart syscall on signal return.  */
# define SA_NODEFER   0x00000008 /* Don't automatically block the signal
				    when its handler is being executed.  */
# define SA_RESETHAND 0x00000010 /* Reset to SIG_DFL on entry to handler.  */
#endif
#ifdef __USE_MISC
# define SA_INTERRUPT 0x20000000 /* Historical no-op.  */

/* 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.  */