mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-16 10:20:30 +00:00
Code Issues Releases Activity

Give up on the "try and compensate for broken programs" cruft and revert

Browse Source 
back to the original single nanosleep() implementation.  This is POSIX and
Unix98 (aka single-unix spec v2) compliant behavior.  If a program sets
alarm(2) or an interval timer (setitimer(2)) without a SIGALRM handler
being active, sleep(3) will no longer absorb it, and the program will get
what it asked for..... :-]

The original reason for this in the first place (apache) doesn't seem to
need it anymore, according to Andrey.

Reviewed by: ache, bde
This commit is contained in:
Peter Wemm 1997-10-15 14:06:15 +00:00
parent d4efecb283
commit 9f375c3252
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=30442
1 changed files with 0 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
lib/libc/gen/sleep.c
View File

@ -38,24 +38,11 @@ static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93";
#include <sys/time.h>
#include <signal.h>
#include <unistd.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
#endif
#ifndef _THREAD_SAFE
static void
sleephandler()
{
return;
}
#endif /* _THREAD_SAFE */
unsigned int
sleep(seconds)
unsigned int seconds;
{
#ifdef _THREAD_SAFE
struct timespec time_to_sleep;
struct timespec time_remaining;
@ -68,61 +55,4 @@ sleep(seconds)
seconds++; /* round up */
}
return (seconds);
#else
struct timespec time_to_sleep;
struct timespec time_remaining;
struct sigaction act, oact;
sigset_t mask, omask;
int alarm_blocked;
if (seconds != 0) {
time_to_sleep.tv_sec = seconds;
time_to_sleep.tv_nsec = 0;
/* Block SIGALRM while fiddling with it */
sigemptyset(&mask);
sigaddset(&mask, SIGALRM);
if (sigprocmask(SIG_BLOCK, &mask, &omask))
return (seconds);
/* Was SIGALRM blocked already? */
alarm_blocked = sigismember(&omask, SIGALRM);
if (!alarm_blocked) {
/*
* Set up handler to interrupt signanosleep only if
* SIGALRM was unblocked. (Save some syscalls)
*/
memset(&act, 0, sizeof(act));
act.sa_handler = sleephandler;
if (sigaction(SIGALRM, &act, &oact)) {
(void)sigprocmask(SIG_SETMASK, &omask,
(sigset_t *)0);
return (seconds);
}
}
/*
* signanosleep() uses the given mask for the lifetime of
* the syscall only - it resets on return. Note that the
* old sleep() explicitly unblocks SIGALRM during the sleep,
* we don't do that now since we don't depend on SIGALRM
* to end the timeout. If the process blocks SIGALRM, it
* gets what it asks for.
*/
(void)signanosleep(&time_to_sleep, &time_remaining, &omask);
if (!alarm_blocked) {
/* Unwind */
(void)sigaction(SIGALRM, &oact, (struct sigaction *)0);
(void)sigprocmask(SIG_SETMASK, &omask, (sigset_t *)0);
}
/* return how long is left */
seconds = time_remaining.tv_sec;
if (time_remaining.tv_nsec > 0)
seconds++; /* round up */
}
return (seconds);
#endif /* _THREAD_SAFE */
}