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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93";
#endif
static char rcsid[] =
"$Id: sleep.c,v 1.23 1998/09/05 08:01:26 jb Exp $";
#endif /* LIBC_SCCS and not lint */
#include <errno.h>
#include <limits.h>
#include <time.h>
#include <unistd.h>
/*
* sleep() - attempt to sleep the specified number of seconds, returning
* any remaining unslept time if interrupted or 0 if the entire
* sleep completes without being interrupted. Avoid seconds vs
* time_t typing problems by breaking down large times with a
* loop.
*/
unsigned int
sleep(seconds)
unsigned int seconds;
{
while (seconds != 0) {
struct timespec time_to_sleep;
struct timespec time_remaining;
time_to_sleep.tv_sec = (seconds > INT_MAX) ? INT_MAX : seconds;
time_to_sleep.tv_nsec = 0;
if (nanosleep(&time_to_sleep, &time_remaining) == -1) {
/*
* time_remaining only valid if EINTR, else assume no
* time elapsed.
*/
if (errno == EINTR)
seconds -= time_to_sleep.tv_sec - time_remaining.tv_sec;
if (time_remaining.tv_nsec)
++seconds;
break;
}
seconds -= time_to_sleep.tv_sec;
}
return(seconds);
}
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