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freebsd-dev/sbin/devd/devd.8

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devd. A daemon that hooks into the kernel's /dev/devctl to produce arbitrary commands when devices come and go in the device tree (which is different than the /dev directory). This is an initial version. Much of the planned power isn't here. Instead of doing the full matching, we always run /etc/devd-generic. /etc/devd.generic will go away at some point, I think. I'm committing it in this early state so I can start getting feedback from early adapters. Approved by: re
2002-10-20 22:15:17 +00:00
.\"
.\" Copyright (c) 2002 M. Warner Losh.
.\" 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 October 17, 2002
.Dt DEVD 8
.Os
.Sh NAME
.Nm devd
.Nd "Device state change daemon"
.Sh SYNOPSIS
.Nm
.Op Fl d
.Sh DESCRIPTION
The
.Nm
daemon provides a way to have userland programs run when certain
kernel events happen.
.Pp
The following options are accepted.
.Bl -tag -width indent
.It Fl d
Enable debugging messages and run in the foreground instead of
becoming a daemon.
.El
.Sh IMPLEMENTATION NOTES
.Nm
- Fix some minor grammar and spelling nits. - Massage the wording in a few places. - Put .Nm on lines by itself so it renders correctly. Reviewed by: imp
2002-11-13 19:31:04 +00:00
is a system daemon that runs in the background all the time.
Whenever a device is added to or removed from the device tree,
.Nm
will execute specified actions.
In addition, when a device without a suitable driver loaded enters the system,
.Nm
will perform a different specified action.
devd. A daemon that hooks into the kernel's /dev/devctl to produce arbitrary commands when devices come and go in the device tree (which is different than the /dev directory). This is an initial version. Much of the planned power isn't here. Instead of doing the full matching, we always run /etc/devd-generic. /etc/devd.generic will go away at some point, I think. I'm committing it in this early state so I can start getting feedback from early adapters. Approved by: re
2002-10-20 22:15:17 +00:00
.Pp
.Nm
hooks into the
.Xr devctl 4
device driver.
This device driver has hooks into the device configuration system.
When nodes are added or deleted from the tree, this device will
- Fix some minor grammar and spelling nits. - Massage the wording in a few places. - Put .Nm on lines by itself so it renders correctly. Reviewed by: imp
2002-11-13 19:31:04 +00:00
deliver information about the event to
devd. A daemon that hooks into the kernel's /dev/devctl to produce arbitrary commands when devices come and go in the device tree (which is different than the /dev directory). This is an initial version. Much of the planned power isn't here. Instead of doing the full matching, we always run /etc/devd-generic. /etc/devd.generic will go away at some point, I think. I'm committing it in this early state so I can start getting feedback from early adapters. Approved by: re
2002-10-20 22:15:17 +00:00
.Nm .
Once
.Nm
has parsed the message, it will search its action list for that kind
- Fix some minor grammar and spelling nits. - Massage the wording in a few places. - Put .Nm on lines by itself so it renders correctly. Reviewed by: imp
2002-11-13 19:31:04 +00:00
of event and perform the action with the highest matching value.
devd. A daemon that hooks into the kernel's /dev/devctl to produce arbitrary commands when devices come and go in the device tree (which is different than the /dev directory). This is an initial version. Much of the planned power isn't here. Instead of doing the full matching, we always run /etc/devd-generic. /etc/devd.generic will go away at some point, I think. I'm committing it in this early state so I can start getting feedback from early adapters. Approved by: re
2002-10-20 22:15:17 +00:00
For most mundane uses, the default handlers are adequate.
However, for more advanced users, the power is present to tweak every
aspect of what happens.
.Pp
- Fix some minor grammar and spelling nits. - Massage the wording in a few places. - Put .Nm on lines by itself so it renders correctly. Reviewed by: imp
2002-11-13 19:31:04 +00:00
.Nm
reads /etc/devd.conf and uses that file to drive the rest of the process.
devd. A daemon that hooks into the kernel's /dev/devctl to produce arbitrary commands when devices come and go in the device tree (which is different than the /dev directory). This is an initial version. Much of the planned power isn't here. Instead of doing the full matching, we always run /etc/devd-generic. /etc/devd.generic will go away at some point, I think. I'm committing it in this early state so I can start getting feedback from early adapters. Approved by: re
2002-10-20 22:15:17 +00:00
While the format of this file is described in
.Xr devd.conf 5
some basics are covered here.
In the options section, one can define multiple directories to search
for config files.
All files in each of these directories are parsed.
These files are intended to be installed by third party vendors that
- Fix some minor grammar and spelling nits. - Massage the wording in a few places. - Put .Nm on lines by itself so it renders correctly. Reviewed by: imp
2002-11-13 19:31:04 +00:00
wish to hook into the
.Nm
system without modifying the user's other
devd. A daemon that hooks into the kernel's /dev/devctl to produce arbitrary commands when devices come and go in the device tree (which is different than the /dev directory). This is an initial version. Much of the planned power isn't here. Instead of doing the full matching, we always run /etc/devd-generic. /etc/devd.generic will go away at some point, I think. I'm committing it in this early state so I can start getting feedback from early adapters. Approved by: re
2002-10-20 22:15:17 +00:00
config files.
.Sh SEE ALSO
.Xr devctl 4 ,
.Xr devd.conf 5
.Sh AUTHORS
.An M. Warner Losh
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