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glibc/sysdeps/posix/sleep.c
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/* Sleep for a given number of seconds. POSIX.1 version. | |
Copyright (C) 1991-2015 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <time.h> | |
#include <unistd.h> | |
#include <errno.h> | |
#include <sys/param.h> | |
/* Make the process sleep for SECONDS seconds, or until a signal arrives | |
and is not ignored. The function returns the number of seconds less | |
than SECONDS which it actually slept (zero if it slept the full time). | |
If a signal handler does a `longjmp' or modifies the handling of the | |
SIGALRM signal while inside `sleep' call, the handling of the SIGALRM | |
signal afterwards is undefined. There is no return value to indicate | |
error, but if `sleep' returns SECONDS, it probably didn't work. */ | |
unsigned int | |
__sleep (unsigned int seconds) | |
{ | |
int save_errno = errno; | |
const unsigned int max | |
= (unsigned int) (((unsigned long int) (~((time_t) 0))) >> 1); | |
struct timespec ts = { 0, 0 }; | |
do | |
{ | |
if (sizeof (ts.tv_sec) <= sizeof (seconds)) | |
{ | |
/* Since SECONDS is unsigned assigning the value to .tv_sec can | |
overflow it. In this case we have to wait in steps. */ | |
ts.tv_sec += MIN (seconds, max); | |
seconds -= (unsigned int) ts.tv_sec; | |
} | |
else | |
{ | |
ts.tv_sec = (time_t) seconds; | |
seconds = 0; | |
} | |
if (__nanosleep (&ts, &ts) < 0) | |
/* We were interrupted. | |
Return the number of (whole) seconds we have not yet slept. */ | |
return seconds + ts.tv_sec; | |
} | |
while (seconds > 0); | |
__set_errno (save_errno); | |
return 0; | |
} | |
weak_alias (__sleep, sleep) |