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freebsd-dev/share/man/man4/update.4

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Added a update(4) man page to describe the kernel initiated update process and changed all of the old references to update(8) to update(4).
1996-02-12 00:45:47 +00:00
.\" Copyright (c) 1996
.\" Mike Pritchard <mpp@FreeBSD.org>. All rights reserved.
.\"
.\" Copyright (c) 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.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 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
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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$Id$ -> $FreeBSD$
1999-08-28 00:22:10 +00:00
.\" $FreeBSD$
add missing cvs Id lines.
1997-03-07 02:50:01 +00:00
.\"
Added a update(4) man page to describe the kernel initiated update process and changed all of the old references to update(8) to update(4).
1996-02-12 00:45:47 +00:00
.Dd February 11, 1996
.Dt UPDATE 4
.Os FreeBSD
.Sh NAME
.Nm update
Mention that the default update time of 30 seconds may be changed with sysctl(8) by changing the kern.update variable. Also make a couple of minor cosmetic changes.
1996-05-31 21:02:16 +00:00
.Nd flush internal filesystem caches to disk periodically
Added a update(4) man page to describe the kernel initiated update process and changed all of the old references to update(8) to update(4).
1996-02-12 00:45:47 +00:00
.Sh SYNOPSIS
.Nm update
.Sh DESCRIPTION
The
.Nm update
kernel process helps protect the integrity of disk volumes
by flushing
volatile cached filesystem data
Mention that the default update time of 30 seconds may be changed with sysctl(8) by changing the kern.update variable. Also make a couple of minor cosmetic changes.
1996-05-31 21:02:16 +00:00
to disk. This is done at thirty second intervals by default.
The time period may be changed by using
.Xr sysctl 8
to modify the
.Va kern.update
variable.
Document the new ".Fx" macro in the mdoc man pages. I also changed the update(4) man page to use this new macro just to have something to test it on.
1996-02-12 19:27:32 +00:00
The
.Nm update
process does the equivalent of the
Added a update(4) man page to describe the kernel initiated update process and changed all of the old references to update(8) to update(4).
1996-02-12 00:45:47 +00:00
.Xr sync 2
function call to do the task.
.Sh SEE ALSO
.Xr sync 2 ,
.Xr fsck 8 ,
.Xr init 8 ,
.Xr rc 8 ,
Mention that the default update time of 30 seconds may be changed with sysctl(8) by changing the kern.update variable. Also make a couple of minor cosmetic changes.
1996-05-31 21:02:16 +00:00
.Xr sync 8 ,
.Xr sysctl 8
Added a update(4) man page to describe the kernel initiated update process and changed all of the old references to update(8) to update(4).
1996-02-12 00:45:47 +00:00
.Sh BUGS
It is possible on some systems that a
mdoc(7)'fy
1999-10-30 15:12:25 +00:00
.Xr sync 2
Added a update(4) man page to describe the kernel initiated update process and changed all of the old references to update(8) to update(4).
1996-02-12 00:45:47 +00:00
occurring simultaneously with a crash may cause
Mention that the default update time of 30 seconds may be changed with sysctl(8) by changing the kern.update variable. Also make a couple of minor cosmetic changes.
1996-05-31 21:02:16 +00:00
file system damage. See
Added a update(4) man page to describe the kernel initiated update process and changed all of the old references to update(8) to update(4).
1996-02-12 00:45:47 +00:00
.Xr fsck 8 .
.Sh HISTORY
An
.Nm update
command appeared in
.At v6 ,
mdoc(7)'fy
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and was usually started by
.Pa /etc/rc
when the system went multi-user.
Document the new ".Fx" macro in the mdoc man pages. I also changed the update(4) man page to use this new macro just to have something to test it on.
1996-02-12 19:27:32 +00:00
A kernel initiated
.Nm update
process first appeared in
.Fx 2.0 .
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