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+.\"	$OpenBSD: sleep.3,v 1.18 2022/03/31 17:27:15 naddy Exp $
+.\"
+.\" Copyright (c) 1986, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: March 31 2022 $
+.Dt SLEEP 3
+.Os
+.Sh NAME
+.Nm sleep
+.Nd suspend execution for an interval of seconds
+.Sh SYNOPSIS
+.In unistd.h
+.Ft unsigned int
+.Fn sleep "unsigned int seconds"
+.Sh DESCRIPTION
+The
+.Fn sleep
+function suspends execution of the calling thread until at least the
+given number of
+.Fa seconds
+have elapsed or an unmasked signal is delivered to the calling thread.
+.Pp
+This version of
+.Fn sleep
+is implemented with
+.Xr nanosleep 2 ,
+so delivery of any unmasked signal will terminate the sleep early,
+even if
+.Dv SA_RESTART
+is set with
+.Xr sigaction 2
+for the interrupting signal.
+.Sh RETURN VALUES
+If
+.Fn sleep
+sleeps for the full count of
+.Fa seconds ,
+it returns 0.
+Otherwise,
+.Fn sleep
+returns the number of seconds remaining from the original request.
+.Sh ERRORS
+The
+.Fn sleep
+function sets
+.Va errno
+to
+.Dv EINTR
+if it is interrupted by the delivery of a signal.
+.Sh SEE ALSO
+.Xr sleep 1 ,
+.Xr nanosleep 2 ,
+.Xr sigaction 2
+.Sh STANDARDS
+The
+.Fn sleep
+function conforms to
+.St -p1003.1-2008 .
+.Pp
+Setting
+.Va errno
+is an extension to that specification.
+.Sh HISTORY
+A
+.Fn sleep
+system call first appeared in
+.At v2 .
+In
+.At v7 ,
+it was removed and replaced by a C library implementation based on
+.Xr signal 3
+and
+.Xr alarm 3 .
+For
+.Ox 2.1 ,
+it was reimplemented as a wrapper around the
+.Xr nanosleep 2
+system call.