/*
 * Copyright (c) 2008, Likewise Software, Inc.
 * All rights reserved.
 */

/*
 * Copyright (c) 2007, Novell, Inc.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Novell, Inc. nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * 
 * (c) Copyright 1990 OPEN SOFTWARE FOUNDATION, INC.
 * (c) Copyright 1990 HEWLETT-PACKARD COMPANY
 * (c) Copyright 1990 DIGITAL EQUIPMENT CORPORATION
 * To anyone who acknowledges that this file is provided "AS IS"
 * without any express or implied warranty:
 *                 permission to use, copy, modify, and distribute this
 * file for any purpose is hereby granted without fee, provided that
 * the above copyright notices and this notice appears in all source
 * code copies, and that none of the names of Open Software
 * Foundation, Inc., Hewlett-Packard Company, or Digital Equipment
 * Corporation be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior
 * permission.  Neither Open Software Foundation, Inc., Hewlett-
 * Packard Company, nor Digital Equipment Corporation makes any
 * representations about the suitability of this software for any
 * purpose.
 * 
 */

#include <sys/time.h>
#include <errno.h>
#include <time.h>
#include <config.h>

#include "dcethread-private.h"
#include "dcethread-util.h"
#include "dcethread-debug.h"

/*
 *  FUNCTIONAL DESCRIPTION:
 *
 *      Convert a delta timespec to absolute (offset by current time)
 *
 *  FORMAL PARAMETERS:
 *
 *      delta   struct timespec; input delta time
 *
 *      abstime struct timespec; output absolute time
 *
 *  IMPLICIT INPUTS:
 *
 *      current time
 *
 *  IMPLICIT OUTPUTS:
 *
 *      none
 *
 *  FUNCTION VALUE:
 *
 *      0 if successful, else -1 and errno set to error code
 *
 *  SIDE EFFECTS:
 *
 *      none
 */
int 
dcethread_get_expiration(struct timespec* delta, struct timespec* abstime)
{
#ifdef HAVE_PTHREAD_GET_EXPIRATION_NP
    return pthread_get_expiration_np(delta, abstime);
#else
    struct timeval now;
    
    if (delta->tv_nsec >= (1000 * 1000000) || delta->tv_nsec < 0) {
	errno = EINVAL;                   
	return -1;
    }
    
    gettimeofday(&now, NULL);
    
    abstime->tv_nsec    = delta->tv_nsec + (now.tv_usec * 1000);
    abstime->tv_sec     = delta->tv_sec + now.tv_sec;
    
    if (abstime->tv_nsec >= (1000 * 1000000)) {   
	abstime->tv_nsec -= (1000 * 1000000);
	abstime->tv_sec += 1;
    }
    
    return 0;
#endif /* HAVE_PTHREAD_GET_EXPIRATION_NP */
}