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.\" $OpenBSD: nanosleep.2,v 1.19 2022/03/31 17:27:16 naddy Exp $
.\" $NetBSD: nanosleep.2,v 1.1 1997/04/17 18:12:02 jtc 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.
.\"
.\" @(#)sleep.3 8.1 (Berkeley) 6/4/93
.\"
.Dd $Mdocdate: March 31 2022 $
.Dt NANOSLEEP 2
.Os
.Sh NAME
.Nm nanosleep
.Nd high resolution sleep
.Sh SYNOPSIS
.In time.h
.Ft int
.Fn nanosleep "const struct timespec *timeout" "struct timespec *remainder"
.Sh DESCRIPTION
The
.Fn nanosleep
function suspends execution of the calling thread for at least the given
.Fa timeout .
Delivery of an unmasked signal terminates this sleep early,
even if
.Dv SA_RESTART
is set with
.Xr sigaction 2
for the interrupting signal.
.Sh RETURN VALUES
If
.Fn nanosleep
sleeps the full
.Fa timeout
without interruption, it returns 0.
Unless
.Fa remainder
is
.Dv NULL ,
it is set to zero.
.Pp
If
.Fn nanosleep
is interrupted by a signal, it returns \-1 and the global variable
.Va errno
is set to
.Dv EINTR .
Unless
.Fa remainder
is
.Dv NULL ,
it is set to the unslept portion of the
.Fa timeout .
.Pp
Otherwise,
.Fn nanosleep
returns \-1 and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn nanosleep
will fail if:
.Bl -tag -width Er
.It Bq Er EINTR
The call is interrupted by the delivery of a signal.
.It Bq Er EINVAL
.Fa timeout
specifies a nanosecond value less than zero or greater than or equal to
one billion,
or a second value less than zero.
.It Bq Er EFAULT
.Fa timeout
points to memory that is not a valid part of the process address space.
.It Bq Er EFAULT
.Fa remainder
is not
.Dv NULL
and points to memory that is not a valid part of the process address space.
.El
.Sh SEE ALSO
.Xr sleep 1 ,
.Xr sigaction 2 ,
.Xr sleep 3
.Sh STANDARDS
The
.Fn nanosleep
function conforms to
.St -p1003.1-2008 .
.Sh HISTORY
The predecessor of this system call,
.Fn sleep ,
first appeared in
.At v2 .
It was removed in
.At v7
and replaced with a C library implementation based on
.Xr alarm 3
and
.Xr signal 3 .
.Pp
The
.Fn nanosleep
function first appeared in
.St -p1003.1b-93 .
.Pp
This implementation of
.Fn nanosleep
first appeared in
.Nx 1.3
and was ported to
.Ox 2.1 .
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