925d069aa8
lifetime of the call, just like the old implementation did. Previously, we were only eating them if the application did not call sleep()/usleep() with SIGALRM masked. Submitted by: ache
114 lines
3.7 KiB
C
114 lines
3.7 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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static char sccsid[] = "@(#)usleep.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/time.h>
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#include <signal.h>
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#include <unistd.h>
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#ifdef _THREAD_SAFE
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#include <pthread.h>
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#include "pthread_private.h"
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#endif
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#ifndef _THREAD_SAFE
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static void
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sleephandler()
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{
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return;
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}
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#endif /* _THREAD_SAFE */
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void
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usleep(useconds)
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unsigned int useconds;
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{
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#ifdef _THREAD_SAFE
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struct timespec time_to_sleep;
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struct timespec time_remaining;
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if (useconds) {
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time_to_sleep.tv_nsec = (useconds % 1000000) * 1000;
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time_to_sleep.tv_sec = useconds / 1000000;
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do {
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nanosleep(&time_to_sleep, &time_remaining);
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time_to_sleep = time_remaining;
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} while (time_to_sleep.tv_sec != 0 &&
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time_to_sleep.tv_nsec != 0);
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}
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#else
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struct timespec time_to_sleep;
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struct timespec time_remaining;
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struct sigaction act, oact;
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sigset_t mask, omask;
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if (useconds != 0) {
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time_to_sleep.tv_nsec = (useconds % 1000000) * 1000;
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time_to_sleep.tv_sec = useconds / 1000000;
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/*
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* Set up handler to interrupt signanosleep and ensure
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* SIGARLM is not blocked. Block SIGALRM while fiddling
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* with things.
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*/
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memset(&act, 0, sizeof(act));
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act.sa_handler = sleephandler;
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sigemptyset(&mask);
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sigaddset(&mask, SIGALRM);
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sigprocmask(SIG_BLOCK, &mask, &omask);
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sigaction(SIGALRM, &act, &oact);
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mask = omask;
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sigdelset(&mask, SIGALRM);
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/*
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* signanosleep() uses the given mask for the lifetime of
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* the syscall only - it resets on return. Note that the
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* old sleep explicitly unblocks SIGALRM during the sleep.
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*/
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do {
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signanosleep(&time_to_sleep, &time_remaining, &mask);
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time_to_sleep = time_remaining;
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} while (time_to_sleep.tv_sec != 0 &&
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time_to_sleep.tv_nsec != 0);
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/* Unwind */
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sigaction(SIGALRM, &oact, (struct sigaction *)0);
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sigprocmask(SIG_SETMASK, &omask, (sigset_t *)0);
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}
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#endif /* _THREAD_SAFE */
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}
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