Manual Page Result
0
Command: sleep | Section: 3 | Source: OpenBSD | File: sleep.3
SLEEP(3) FreeBSD Library Functions Manual SLEEP(3)
NAME
sleep - suspend execution for an interval of seconds
SYNOPSIS
#include <unistd.h>
unsigned int
sleep(unsigned int seconds);
DESCRIPTION
The sleep() function suspends execution of the calling thread until at
least the given number of seconds have elapsed or an unmasked signal is
delivered to the calling thread.
This version of sleep() is implemented with nanosleep(2), so delivery of
any unmasked signal will terminate the sleep early, even if SA_RESTART is
set with sigaction(2) for the interrupting signal.
RETURN VALUES
If sleep() sleeps for the full count of seconds, it returns 0.
Otherwise, sleep() returns the number of seconds remaining from the
original request.
ERRORS
The sleep() function sets errno to EINTR if it is interrupted by the
delivery of a signal.
SEE ALSO
sleep(1), nanosleep(2), sigaction(2)
STANDARDS
The sleep() function conforms to IEEE Std 1003.1-2008 ("POSIX.1").
Setting errno is an extension to that specification.
HISTORY
A sleep() system call first appeared in Version 2 AT&T UNIX. In
Version 7 AT&T UNIX, it was removed and replaced by a C library
implementation based on signal(3) and alarm(3). For OpenBSD 2.1, it was
reimplemented as a wrapper around the nanosleep(2) system call.
FreeBSD 14.1-RELEASE-p8 March 31, 2022 FreeBSD 14.1-RELEASE-p8