36cd7cef5e
Discussed on hackers and recommended for inclusion into 9.0 at the devsummit. All support email to devin dteske at vicor dot ignoreme dot com . Submitted by: dteske at vicor dot ignoreme dot com Reviewed by: me and many others
127 lines
3.5 KiB
Groff
127 lines
3.5 KiB
Groff
.\" Copyright (c) 2011 Devin Teske
|
|
.\" 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.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 May 18, 2011
|
|
.Dt DELAY.4TH 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm delay.4th
|
|
.Nd FreeBSD debugging boot module.
|
|
.Sh DESCRIPTION
|
|
The file that goes by the name of
|
|
.Nm
|
|
is a set of commands designed to add debugging capabilities to
|
|
.Xr loader 8 .
|
|
The commands of
|
|
.Nm
|
|
by themselves are not enough for most uses.
|
|
Please refer to the
|
|
examples below for the most common situations, and to
|
|
.Xr loader 8
|
|
for additional commands.
|
|
.Pp
|
|
Before using any of the commands provided in
|
|
.Nm ,
|
|
it must be included
|
|
through the command:
|
|
.Pp
|
|
.Dl include delay.4th
|
|
.Pp
|
|
This line is present in
|
|
.Pa /boot/beastie.4th
|
|
file, so it is not needed (and should not be re-issued) in a normal setup.
|
|
.Pp
|
|
The commands provided by it are:
|
|
.Pp
|
|
.Bl -tag -width disable-module_module -compact -offset indent
|
|
.It Ic delay_execute
|
|
Executes the [string] procedure stored in the
|
|
.Ic delay_command
|
|
environment variable after
|
|
.Ic loader_delay
|
|
seconds.
|
|
.Pp
|
|
If the optional
|
|
.Ic delay_showdots
|
|
environment variable is set, a continuous series of dots is printed.
|
|
.Pp
|
|
During the duration, the user can either press Ctrl-C (or Esc) to abort or
|
|
ENTER to proceed immediately.
|
|
.El
|
|
.Pp
|
|
The environment variables that effect its behavior are:
|
|
.Bl -tag -width bootfile -offset indent
|
|
.It Va delay_command
|
|
The command to be executed by
|
|
.Ic delay_execute .
|
|
.It Va loader_delay
|
|
The duration (in seconds) to delay before executing
|
|
.Ic delay_command .
|
|
.It Va delay_showdots
|
|
If set, will cause
|
|
.Ic delay_execute
|
|
to print a continuous series of dots during the delay duration.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width /boot/loader.4th -compact
|
|
.It Pa /boot/loader
|
|
The
|
|
.Xr loader 8 .
|
|
.It Pa /boot/delay.4th
|
|
.Nm
|
|
itself.
|
|
.It Pa /boot/loader.rc
|
|
.Xr loader 8
|
|
bootstrapping script.
|
|
.El
|
|
.Sh EXAMPLES
|
|
Introducing a 5-second delay before including another file from
|
|
.Pa /boot/loader.rc :
|
|
.Pp
|
|
.Bd -literal -offset indent -compact
|
|
include /boot/delay.4th
|
|
set delay_command="include /boot/other.4th"
|
|
set delay_showdots
|
|
set loader_delay=5
|
|
delay_execute
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr loader.conf 5 ,
|
|
.Xr loader 8 ,
|
|
.Xr beastie.4th 8 ,
|
|
.Xr loader.4th 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
set of commands first appeared in
|
|
.Fx 9.0 .
|
|
.Sh AUTHORS
|
|
The
|
|
.Nm
|
|
set of commands was written by
|
|
.An -nosplit
|
|
.An Devin Teske Aq devinteske@hotmail.com .
|