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127 lines
3.5 KiB
Groff
127 lines
3.5 KiB
Groff
.\" Copyright (c) 2011 Devin Teske
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 18, 2011
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.Dt DELAY.4TH 8
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.Os
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.Sh NAME
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.Nm delay.4th
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.Nd FreeBSD debugging boot module
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.Sh DESCRIPTION
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The file that goes by the name of
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.Nm
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is a set of commands designed to add debugging capabilities to
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.Xr loader 8 .
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The commands of
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.Nm
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by themselves are not enough for most uses.
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Please refer to the
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examples below for the most common situations, and to
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.Xr loader 8
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for additional commands.
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.Pp
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Before using any of the commands provided in
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.Nm ,
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it must be included
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through the command:
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.Pp
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.Dl include delay.4th
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.Pp
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This line is present in
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.Pa /boot/beastie.4th
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file, so it is not needed (and should not be re-issued) in a normal setup.
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.Pp
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The commands provided by it are:
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.Pp
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.Bl -tag -width disable-module_module -compact -offset indent
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.It Ic delay_execute
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Executes the [string] procedure stored in the
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.Ic delay_command
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environment variable after
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.Ic loader_delay
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seconds.
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.Pp
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If the optional
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.Ic delay_showdots
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environment variable is set, a continuous series of dots is printed.
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.Pp
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During the duration, the user can either press Ctrl-C (or Esc) to abort or
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ENTER to proceed immediately.
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.El
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.Pp
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The environment variables that effect its behavior are:
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.Bl -tag -width bootfile -offset indent
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.It Va delay_command
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The command to be executed by
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.Ic delay_execute .
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.It Va loader_delay
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The duration (in seconds) to delay before executing
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.Ic delay_command .
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.It Va delay_showdots
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If set, will cause
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.Ic delay_execute
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to print a continuous series of dots during the delay duration.
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.El
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.Sh FILES
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.Bl -tag -width /boot/loader.4th -compact
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.It Pa /boot/loader
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The
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.Xr loader 8 .
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.It Pa /boot/delay.4th
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.Nm
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itself.
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.It Pa /boot/loader.rc
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.Xr loader 8
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bootstrapping script.
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.El
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.Sh EXAMPLES
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Introducing a 5-second delay before including another file from
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.Pa /boot/loader.rc :
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.Pp
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.Bd -literal -offset indent -compact
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include /boot/delay.4th
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set delay_command="include /boot/other.4th"
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set delay_showdots
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set loader_delay=5
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delay_execute
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.Ed
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.Sh SEE ALSO
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.Xr loader.conf 5 ,
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.Xr loader 8 ,
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.Xr beastie.4th 8 ,
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.Xr loader.4th 8
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.Sh HISTORY
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The
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.Nm
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set of commands first appeared in
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.Fx 9.0 .
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.Sh AUTHORS
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The
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.Nm
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set of commands was written by
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.An -nosplit
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.An Devin Teske Aq dteske@FreeBSD.org .
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