Linux man pages

HOME Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section 9

Section (1) sleep

Linux manual pages Section 1  

Name

sleep — delay for a specified amount of time

Synopsis

sleep NUMBER[SUFFIX]...

sleep OPTION

DESCRIPTION

Pause for NUMBER seconds. SUFFIX may be _zsingle_quotesz_s_zsingle_quotesz_ for seconds (the default), _zsingle_quotesz_m_zsingle_quotesz_ for minutes, _zsingle_quotesz_h_zsingle_quotesz_ for hours or _zsingle_quotesz_d_zsingle_quotesz_ for days. NUMBER need not be an integer. Given two or more arguments, pause for the amount of time specified by the sum of their values.

−−help

display this help and exit

−−version

output version information and exit

AUTHOR

Written by Jim Meyering and Paul Eggert.

REPORTING BUGS

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>

Report any translation bugs to <https://translationproject.org/team/>

SEE ALSO

sleep(3)

Full documentation <https://www.gnu.org/software/coreutils/sleep>

or available locally via: info _zsingle_quotesz_(coreutils) sleep invocation_zsingle_quotesz_

COPYRIGHT

Copyright © 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.

This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

Section (3) sleep

Linux manual pages Section 3  

Name

sleep — sleep for a specified number of seconds

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).

Interface Attribute Value
sleep() Thread safety MT-Unsafe sig:SIGCHLD/linux

CONFORMING TO

POSIX.1-2001, POSIX.1-2008.

NOTES

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

Portability notes

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.

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)

COLOPHON

This page is part of release 4.16 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man−pages/.


  Copyright (c) 1993 by Thomas Koenig (ig25rz.uni-karlsruhe.de)

%%%LICENSE_START(VERBATIM)
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.

Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.

Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date.  The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein.  The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
professionally.

Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.
%%%LICENSE_END

Modified Sat Jul 24 18:16:02 1993 by Rik Faith (faithcs.unc.edu)