49d6409ac7
Rewrote sleep() to remove int/long typing assumptions between the argument
to the function and the timespec structure.
82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93";
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#endif
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static char rcsid[] =
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"$Id: sleep.c,v 1.23 1998/09/05 08:01:26 jb Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <errno.h>
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#include <limits.h>
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#include <time.h>
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#include <unistd.h>
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/*
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* sleep() - attempt to sleep the specified number of seconds, returning
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* any remaining unslept time if interrupted or 0 if the entire
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* sleep completes without being interrupted. Avoid seconds vs
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* time_t typing problems by breaking down large times with a
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* loop.
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*/
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unsigned int
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sleep(seconds)
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unsigned int seconds;
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{
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while (seconds != 0) {
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struct timespec time_to_sleep;
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struct timespec time_remaining;
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time_to_sleep.tv_sec = (seconds > INT_MAX) ? INT_MAX : seconds;
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time_to_sleep.tv_nsec = 0;
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if (nanosleep(&time_to_sleep, &time_remaining) == -1) {
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/*
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* time_remaining only valid if EINTR, else assume no
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* time elapsed.
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*/
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if (errno == EINTR)
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seconds -= time_to_sleep.tv_sec - time_remaining.tv_sec;
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if (time_remaining.tv_nsec)
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++seconds;
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break;
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}
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seconds -= time_to_sleep.tv_sec;
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}
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return(seconds);
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}
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