freebsd-skq/lib/libc/sys/nanosleep.2
phantom 189bace3d7 Name Description (.Nd macro) added.
Style and punctuation errors fixes.
ERRORS section included to RETURN VALUES because it's
describing return values instead of errors and their handling.

Reviewed by:	mpp
1999-09-05 06:59:34 +00:00

105 lines
3.6 KiB
Groff

.\" $FreeBSD$
.\" $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
.Nm nanosleep
.Nd suspend process execution for an interval measured in nanoseconds
.Sh SYNOPSIS
.Fd #include <time.h>
.Ft int
.Fn nanosleep "const struct timespec *rqtp" "struct timespec *rmtp"
.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
If the
.Fn nanosleep
function returns because the requested time has elapsed, the value
returned will be zero.
.Pp
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.
If
.Fa rmtp
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).
.Pp
If any of the following conditions occur, the
.Fn nanosleep
function shall return -1 and set
.Va errno
to the corresponding value:
.Bl -tag -width Er
.It Bq Er EFAULT
Either
.Fa rqtp
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
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 .