'\" te
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.TH NANOSLEEP 3C "Feb 5, 2008"
.SH NAME
nanosleep \- high resolution sleep
.SH SYNOPSIS
.LP
.nf
#include <time.h>

\fBint\fR \fBnanosleep\fR(\fBconst struct timespec *\fR\fIrqtp\fR,
     \fBstruct timespec *\fR\fIrmtp\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBnanosleep()\fR function causes the current thread  to be suspended from
execution until either the time interval specified by the \fIrqtp\fR argument
has elapsed or a signal is delivered to the calling thread and its action is to
invoke a signal-catching function or to terminate the process. The suspension
time may be longer than requested because the argument value is rounded up to
an integer multiple of the sleep resolution or because of the scheduling of
other activity by the system. But, except for the case of being interrupted by
a signal, the suspension time will not be less than the time specified by
\fIrqtp\fR, as measured by the system clock, \fBCLOCK_REALTIME\fR.
.sp
.LP
The use of the \fBnanosleep()\fR function has no effect on the action or
blockage of any signal.
.SH RETURN VALUES
.sp
.LP
If the \fBnanosleep()\fR function returns because the requested time has
elapsed, its return value is \fB0\fR.
.sp
.LP
If the \fBnanosleep()\fR function returns because it has been interrupted by a
signal, the function returns a value of \(mi1 and sets \fBerrno\fR to indicate
the interruption. If the \fIrmtp\fR argument is non-\fINULL\fR, the
\fBtimespec\fR structure referenced by it is updated to contain the amount of
time remaining in the interval (the requested time minus the time actually
slept). If the \fIrmtp\fR argument is \fINULL\fR, the remaining time is not
returned.
.sp
.LP
If \fBnanosleep()\fR fails, it returns \fB\(mi1\fR and sets \fBerrno\fR to
indicate the error.
.SH ERRORS
.sp
.LP
The \fBnanosleep()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEINTR\fR\fR
.ad
.RS 10n
The \fBnanosleep()\fR function was interrupted by a signal.
.RE

.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The \fIrqtp\fR argument specified a nanosecond value less than zero or greater
than or equal to 1000 million.
.RE

.sp
.ne 2
.na
\fB\fBENOSYS\fR\fR
.ad
.RS 10n
The \fBnanosleep()\fR function is not supported by this implementation.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
MT-Level	MT-Safe
_
Standard	See \fBstandards\fR(5).
.TE

.SH SEE ALSO
.sp
.LP
\fBsleep\fR(3C), \fBtime.h\fR(3HEAD), \fBattributes\fR(5), \fBstandards\fR(5)