freebsd-dev/lib/libc/sys/nanosleep.2

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.\" $FreeBSD$
.\" $OpenBSD: nanosleep.2,v 1.1 1997/04/20 20:56:20 tholo Exp $
.\" $NetBSD: nanosleep.2,v 1.1 1997/04/17 18:12:02 jtc Exp $
.\"
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.\" @(#)sleep.3 8.1 (Berkeley) 6/4/93
.\"
.Dd April 17, 1997
.Dt NANOSLEEP 2
.Os
.Sh NAME
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.Nm nanosleep
.Nd suspend process execution for an interval measured in nanoseconds
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In time.h
.Ft int
.Fn nanosleep "const struct timespec *rqtp" "struct timespec *rmtp"
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.Sh DESCRIPTION
.Fn Nanosleep
causes the process to sleep for the specified time. An unmasked signal will
cause it to terminate the sleep early, regardless of the
.Dv SA_RESTART
value on the interrupting signal.
.Sh RETURN VALUES
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If the
.Fn nanosleep
function returns because the requested time has elapsed, the value
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returned will be zero.
.Pp
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If the
.Fn nanosleep
function returns due to the delivery of a signal, the value returned
will be the -1, and the global variable
.Va errno
will be set to indicate the interruption.
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If
.Fa rmtp
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is
.Pf non- Dv NULL ,
the timespec structure it references is updated to contain the
unslept amount (the request time minus the time actually slept).
.Sh ERRORS
The
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.Fn nanosleep
call fails if:
.Bl -tag -width Er
.It Bq Er EFAULT
Either
.Fa rqtp
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or
.Fa rmtp
points to memory that is not a valid part of the process
address space.
.It Bq Er EINTR
.Fn nanosleep
was interrupted by the delivery of a signal.
.It Bq Er EINVAL
.Fa rqtp
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specified a nanosecond value less than zero
or greater than or equal to 1000 million.
.It Bq Er ENOSYS
.Fn nanosleep
is not supported by this implementation.
.El
.Sh SEE ALSO
.Xr sigsuspend 2 ,
.Xr sleep 3
.Sh STANDARDS
The
.Fn nanosleep
function conforms to
.St -p1003.1b-93 .