Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
DEVD(8)			FreeBSD	System Manager's Manual		       DEVD(8)

NAME
     devd -- Device state change daemon

SYNOPSIS
     devd [-d]

DESCRIPTION
     The devd daemon provides a	way to have userland programs run when certain
     kernel events happen.

     The following options are accepted.

     -d	     Enable debugging messages and run in the foreground instead of
	     becoming a	daemon.

IMPLEMENTATION NOTES
     devd is a system daemon that runs in the background all the time.	When-
     ever a device is added to or removed from the device tree,	devd will exe-
     cute actions specified in devd.conf(5).  For example, devd	might execute
     dhclient(8) when an ethernet adapter is added to the system and kill the
     dhclient(8) instance when the same	adapter	is removed.  Another example
     would be for devd to use a	table to locate	and load via kldload(8)	the
     proper driver for an unrecognized device that is added to the system.

     devd hooks	into the 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 deliver information about the
     event to devd.  Once devd has parsed the message, it will search its
     action list for that kind of event	and perform the	action with the	high-
     est matching value.  For most mundane uses, the default handlers are ade-
     quate.  However, for more advanced	users, the power is present to tweak
     every aspect of what happens.

     devd reads	/etc/devd.conf and uses	that file to drive the rest of the
     process.  While the format	of this	file is	described in 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 wish to hook into	the devd system	without	modi-
     fying the user's other config files.

SEE ALSO
     devctl(4),	devd.conf(5)

AUTHORS
     M.	Warner Losh

BUGS
     devd currently always runs	"/etc/devd-generic $device $startstop" for all
     device events, regardless of what the config file says to do.

FreeBSD	9.3		       October 17, 2002			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | IMPLEMENTATION NOTES | SEE ALSO | AUTHORS | BUGS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=devd&sektion=8&manpath=FreeBSD+5.0-RELEASE>

home | help