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.\" (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" License.
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.\" Modified Sat Jul 24 18:16:02 1993 by Rik Faith (faith@cs.unc.edu)
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.TH SLEEP 3 1993-04-07 "GNU" "Linux Programmer's Manual"
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.SH NAME
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sleep \- Sleep for the specified number of seconds
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.SH SYNOPSIS
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.nf
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.B #include <unistd.h>
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.sp
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.BI "unsigned int sleep(unsigned int " "seconds" );
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.fi
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.SH DESCRIPTION
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.BR sleep ()
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makes the current process sleep until
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.I seconds
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seconds have elapsed or a signal arrives which is not ignored.
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.SH "RETURN VALUE"
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Zero if the requested time has elapsed, or the number of seconds left to sleep.
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.SH "CONFORMING TO"
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2006-08-03 13:57:30 +00:00
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POSIX.1-2001.
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.SH BUGS
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.BR sleep ()
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may be implemented using
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.BR SIGALRM ;
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mixing calls to
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.BR alarm ()
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and
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.BR sleep ()
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is a bad idea.
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.PP
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Using
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.BR longjmp ()
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from a signal handler or modifying the handling of
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.B SIGALRM
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while sleeping will cause undefined results.
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.SH "SEE ALSO"
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.BR alarm (2),
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.BR signal (2)
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