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-.\"	$OpenBSD: clock_gettime.2,v 1.4 1997/05/08 20:21:16 kstailey Exp $
-.\"
-.\" Copyright (c) 1980, 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.
-.\" 4. 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd December 29, 2009
-.Dt CLOCK_GETTIME 2
-.Os
-.Sh NAME
-.Nm clock_gettime ,
-.Nm clock_settime ,
-.Nm clock_getres
-.Nd get/set/calibrate date and time
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In time.h
-.Ft int
-.Fn clock_gettime "clockid_t clock_id" "struct timespec *tp"
-.Ft int
-.Fn clock_settime "clockid_t clock_id" "const struct timespec *tp"
-.Ft int
-.Fn clock_getres "clockid_t clock_id" "struct timespec *tp"
-.Sh DESCRIPTION
-The
-.Fn clock_gettime
-and
-.Fn clock_settime
-system calls allow the calling process to retrieve or set the value
-used by a clock which is specified by
-.Fa clock_id .
-.Pp
-The
-.Fa clock_id
-argument
-can be one of the following values:
-.Dv CLOCK_REALTIME ,
-.Dv CLOCK_REALTIME_PRECISE ,
-.Dv CLOCK_REALTIME_FAST
-for time that increments as
-a wall clock should;
-.Dv CLOCK_MONOTONIC ,
-.Dv CLOCK_MONOTONIC_PRECISE ,
-.Dv CLOCK_MONOTONIC_FAST
-which increments in SI seconds;
-.Dv CLOCK_UPTIME ,
-.Dv CLOCK_UPTIME_PRECISE ,
-.Dv CLOCK_UPTIME_FAST
-which starts at zero when the kernel boots and increments
-monotonically in SI seconds while the machine is running;
-.Dv CLOCK_VIRTUAL
-for time that increments only when
-the CPU is running in user mode on behalf of the calling process;
-.Dv CLOCK_PROF
-for time that increments when the CPU is running in user or
-kernel mode; or
-.Dv CLOCK_SECOND
-which returns the current second without performing a full time counter
-query, using in-kernel cached value of current second.
-.Pp
-The clock IDs
-.Fa CLOCK_REALTIME_FAST ,
-.Fa CLOCK_MONOTONIC_FAST ,
-.Fa CLOCK_UPTIME_FAST
-are analogs of corresponding IDs without _FAST suffix but do not perform
-a full time counter query, so their accuracy is one timer tick.
-Similarly,
-.Fa CLOCK_REALTIME_PRECISE ,
-.Fa CLOCK_MONOTONIC_PRECISE ,
-.Fa CLOCK_UPTIME_PRECISE
-are used to get the most exact value as possible, at the expense of
-execution time.
-.Pp
-The structure pointed to by
-.Fa tp
-is defined in
-.In sys/timespec.h
-as:
-.Bd -literal
-struct timespec {
-	time_t	tv_sec;		/* seconds */
-	long	tv_nsec;	/* and nanoseconds */
-};
-.Ed
-.Pp
-Only the super-user may set the time of day, using only
-.Fa CLOCK_REALTIME .
-If the system securelevel is greater than 1 (see
-.Xr init 8 ) ,
-the time may only be advanced.
-This limitation is imposed to prevent a malicious super-user
-from setting arbitrary time stamps on files.
-The system time can still be adjusted backwards using the
-.Xr adjtime 2
-system call even when the system is secure.
-.Pp
-The resolution (granularity) of a clock is returned by the
-.Fn clock_getres
-system call.
-This value is placed in a (non-NULL)
-.Fa *tp .
-.Sh RETURN VALUES
-.Rv -std
-.Sh ERRORS
-The following error codes may be set in
-.Va errno :
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa clock_id
-argument
-was not a valid value.
-.It Bq Er EFAULT
-The
-.Fa *tp
-argument address referenced invalid memory.
-.It Bq Er EPERM
-A user other than the super-user attempted to set the time.
-.El
-.Sh SEE ALSO
-.Xr date 1 ,
-.Xr adjtime 2 ,
-.Xr ctime 3 ,
-.Xr timed 8
-.Sh STANDARDS
-The
-.Fn clock_gettime ,
-.Fn clock_settime ,
-and
-.Fn clock_getres
-system calls conform to
-.St -p1003.1b-93 .
-The clock IDs
-.Fa CLOCK_REALTIME_FAST ,
-.Fa CLOCK_REALTIME_PRECISE ,
-.Fa CLOCK_MONOTONIC_FAST ,
-.Fa CLOCK_MONOTONIC_PRECISE ,
-.Fa CLOCK_UPTIME ,
-.Fa CLOCK_UPTIME_FAST ,
-.Fa CLOCK_UPTIME_PRECISE ,
-.Fa CLOCK_SECOND
-are FreeBSD extensions to the POSIX interface.