eebddce2d9
(nanosleep) breaks Apache httpd badly: his childs died quickly after number of requests (SIGPIPE). To reproduce this bug start gdb /usr/local/sbin/httpd run -X and make some bunch of concurent requests (load the server pages from 3 different places f.e.) After short time httpd dies via SIGPIPE. It never dies with old sleep.c In real life it looks like lots of broken images on the pages or missing pages. Lynx says about Network read error, etc. It seems something wrong in nanosleep signal handling.
118 lines
3.7 KiB
C
118 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[] = "@(#)sleep.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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#else
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#define setvec(vec, a) \
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vec.sv_handler = a; vec.sv_mask = vec.sv_onstack = 0
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static int ringring;
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#endif
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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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#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 (seconds) {
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time_to_sleep.tv_sec = seconds;
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time_to_sleep.tv_nsec = 0;
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nanosleep(&time_to_sleep,&time_remaining);
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seconds = time_remaining.tv_sec;
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}
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return(seconds);
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#else
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register struct itimerval *itp;
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struct itimerval itv, oitv;
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struct sigvec vec, ovec;
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long omask;
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static void sleephandler();
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itp = &itv;
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if (!seconds)
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return 0;
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timerclear(&itp->it_interval);
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timerclear(&itp->it_value);
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if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
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return seconds;
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itp->it_value.tv_sec = seconds;
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if (timerisset(&oitv.it_value)) {
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if (timercmp(&oitv.it_value, &itp->it_value, >))
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oitv.it_value.tv_sec -= itp->it_value.tv_sec;
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else {
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itp->it_value = oitv.it_value;
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/*
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* This is a hack, but we must have time to return
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* from the setitimer after the alarm or else it'll
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* be restarted. And, anyway, sleep never did
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* anything more than this before.
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*/
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oitv.it_value.tv_sec = 1;
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oitv.it_value.tv_usec = 0;
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}
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}
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setvec(vec, sleephandler);
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(void) sigvec(SIGALRM, &vec, &ovec);
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omask = sigblock(sigmask(SIGALRM));
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ringring = 0;
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(void) setitimer(ITIMER_REAL, itp, (struct itimerval *)0);
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while (!ringring)
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sigpause(omask &~ sigmask(SIGALRM));
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(void) sigvec(SIGALRM, &ovec, (struct sigvec *)0);
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(void) sigsetmask(omask);
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(void) setitimer(ITIMER_REAL, &oitv, (struct itimerval *)0);
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return 0;
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#endif
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}
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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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ringring = 1;
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}
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#endif
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