/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*

 * POSIX signal manipulation functions.

 */

#pragma weak _sigfillset = sigfillset

#pragma weak _sigemptyset = sigemptyset

#pragma weak _sigaddset = sigaddset

#pragma weak _sigdelset = sigdelset

#pragma weak _sigismember = sigismember

#include "lint.h"

#include <sys/types.h>

#include <stdio.h>

#include <sys/param.h>

#include <sys/signal.h>

#include <errno.h>

#include "libc.h"

#define	SIGSETSIZE	4

#define	MAXBITNO (NBPW*8)

static sigset_t sigs;

static int sigsinit;

#define	sigword(n) ((n-1)/MAXBITNO)

#define	bitmask(n) (1L<<((n-1)%MAXBITNO))

static int

sigvalid(int sig)

{

	if (sig <= 0 || sig > (MAXBITNO * SIGSETSIZE))

		return (0);

	if (!sigsinit) {

		(void) __sigfillset(&sigs);

		sigsinit++;

	}

	return ((sigs.__sigbits[sigword(sig)] & bitmask(sig)) != 0);

}

int

sigfillset(sigset_t *set)

{

	if (!sigsinit) {

		(void) __sigfillset(&sigs);

		sigsinit++;

	}

	*set = sigs;

	return (0);

}

int

sigemptyset(sigset_t *set)

{

	set->__sigbits[0] = 0;

	set->__sigbits[1] = 0;

	set->__sigbits[2] = 0;

	set->__sigbits[3] = 0;

	return (0);

}

int

sigaddset(sigset_t *set, int sig)

{

	if (!sigvalid(sig)) {

		errno = EINVAL;

		return (-1);

	}

	set->__sigbits[sigword(sig)] |= bitmask(sig);

	return (0);

}

int

sigdelset(sigset_t *set, int sig)

{

	if (!sigvalid(sig)) {

		errno = EINVAL;

		return (-1);

	}

	set->__sigbits[sigword(sig)] &= ~bitmask(sig);

	return (0);

}

int

sigismember(const sigset_t *set, int sig)

{

	if (!sigvalid(sig)) {

		errno = EINVAL;

		return (-1);

	}

	return ((set->__sigbits[sigword(sig)] & bitmask(sig)) != 0);

}