diff options
author | Kenneth R Westerback <krw@cvs.openbsd.org> | 2001-07-16 20:50:01 +0000 |
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committer | Kenneth R Westerback <krw@cvs.openbsd.org> | 2001-07-16 20:50:01 +0000 |
commit | 18672d85ce6e63a43b7c7042e36d9c3d90d36557 (patch) | |
tree | 21f68b9ee4f7809359ed7fa8825eddc53af879fa /share/man/man9 | |
parent | f1a2dff38086a5f1880eabe12b41936905f2e64e (diff) |
Add a man page for the much referenced hardclock(9).
Thanks to niklas@, fgs@, mpech@ for feedback.
Diffstat (limited to 'share/man/man9')
-rw-r--r-- | share/man/man9/hardclock.9 | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/share/man/man9/hardclock.9 b/share/man/man9/hardclock.9 new file mode 100644 index 00000000000..7cc9aaf0798 --- /dev/null +++ b/share/man/man9/hardclock.9 @@ -0,0 +1,78 @@ +.\" $OpenBSD: hardclock.9,v 1.1 2001/07/16 20:50:00 krw Exp $ +.\" +.\" Copyright (c) 2001 Kenneth R Westerback +.\" 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, +.\" without modification, immediately at the beginning of the file. +.\" 2. The name of the author may not be used to endorse or promote products +.\" derived from this software without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR OR HIS RELATIVES 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 MIND, 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. +.\" +.Dd Jul 14, 2001 +.Dt HARDCLOCK 9 +.Os +.Sh NAME +.Nm hardclock +.Nd real-time system clock +.Sh SYNOPSIS +.Fd #include <sys/systm.h> +.Ft void +.Fo "hardclock" +.Fa "struct clockframe *frame" +.Fc +.Sh DESCRIPTION +.Fn hardclock +implements the the real-time system clock, interrupting +.Xr hz 9 +times a second. +The argument +.Fa frame +is an opaque, machine dependant structure that encapsulates the +previous machine state. +.Pp +.Fn hardclock +performs a variety of time related housekeeping tasks, such as +.Bl -bullet -offset indent +.It +If the current process has virtual or profiling interval +timers, update the timers and deliver appropriate signals. +.It +If there is no separate statistics clock, execute +.Xr statclock 9 . +.It +Increment the time of day, implementing any adjustments requested by +.Xr adjtime 2 +or required as a result of running a ntp daemon or other configured +external clock. +.It +Update the real-time timeout queue, calling +.Fn softclock +directly if the current interrupt priority is low enough. +.El +.Sh SEE ALSO +.Xr adjtime 2 , +.Xr hz 9 , +.Xr microtime 9 , +.Xr spl 9 , +.Xr time 9 , +.Xr timeout 9 +.Sh CODE REFERENCES +.Fn hardclock +is implemented in the file +.Pa sys/kern/kern_clock.c . |