Man page - sleep(3)

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Manual

sleep

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
VERSIONS
STANDARDS
HISTORY
CAVEATS
SEE ALSO

NAME

sleep - sleep for a specified number of seconds

LIBRARY

Standard C library ( libc , -lc )

SYNOPSIS

#include <unistd.h>

unsigned int sleep(unsigned int seconds );

DESCRIPTION

sleep () causes the calling thread to sleep either until the number of real-time seconds specified in seconds have elapsed or until a signal arrives which is not ignored.

RETURN VALUE

Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

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VERSIONS

On Linux, sleep () is implemented via nanosleep (2). See the nanosleep (2) man page for a discussion of the clock used.

On some systems, sleep () may be implemented using alarm (2) and SIGALRM (POSIX.1 permits this); mixing calls to alarm (2) and sleep () is a bad idea.

STANDARDS

POSIX.1-2008.

HISTORY

POSIX.1-2001.

CAVEATS

Using longjmp (3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.

SEE ALSO

sleep (1), alarm (2), nanosleep (2), signal (2), signal (7)