.\" (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
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.\" Modified Sat Jul 24 18:16:02 1993 by Rik Faith (faith@cs.unc.edu)
.TH SLEEP 3  "April 7, 1993" "GNU" "Linux Programmer's Manual"
.SH NAME
sleep \- Sleep for the specified number of seconds
.SH SYNOPSIS
.nf
.B #include <unistd.h>
.sp
.BI "unsigned int sleep(unsigned int " "seconds" ");"
.fi
.SH DESCRIPTION
.B sleep()
makes the current process sleep until
.I seconds
seconds have elapsed or a signal arrives which is not ignored.
.SH "RETURN VALUE"
Zero if the requested time has elapsed, or the number of seconds left to sleep.
.SH "CONFORMING TO"
POSIX.1
.SH "BUGS"
.B sleep()
may be implemented using
.BR SIGALRM ;
mixing calls to
.B alarm()
and
.B sleep() 
is a bad idea.
.PP
Using
.B longjmp()
from a signal handler or modifying the handling of 
.B SIGALRM
while sleeping will cause undefined results.
.SH "SEE ALSO"
.BR signal "(2), " alarm (2)