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==Introduction==
 
==Introduction==
  
Refer to [https://www.freebsd.org/cgi/man.cgi?query=devd.conf&apropos=0&sektion=0&manpath=FreeBSD+12.1-RELEASE+and+Ports&arch=default&format=html devd.conf(5)] and [https://www.freebsd.org/cgi/man.cgi?query=devd&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports devd(8)] man pages for the details on how to run and configure devd.
 
'''devd.conf ''' is the configuration file for [https://www.freebsd.org/cgi/man.cgi?query=devd&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports devd(8)]
 
  
==What is [https://www.freebsd.org/cgi/man.cgi?query=devd&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports devd(8)]==
 
  
The devd daemon provides a way to have userland programs run when certain  kernel events happen.
 
  
The devd utility is a system daemon that runs in the background all the time.  Whenever a device is added to or removed from the device tree,  devd will execute actions specified in [https://www.freebsd.org/cgi/man.cgi?query=devd.conf&apropos=0&sektion=0&manpath=FreeBSD+12.1-RELEASE+and+Ports&arch=default&format=html devd.conf(5)].  For example, devd  might execute [https://www.freebsd.org/cgi/man.cgi?query=dhclient&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports dhclient(8)] when an Ethernet adapter is added to the system, and kill the [https://www.freebsd.org/cgi/man.cgi?query=dhclient&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports dhclient(8)] instance when the same adapter is removed.<br/>
 
Another example would be for devd to use a table to locate and load via [https://www.freebsd.org/cgi/man.cgi?query=kldload&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports kldload(8)] the proper driver for an unrecognized device that is added to  the system.
 
  
The devd utility hooks into the [https://www.freebsd.org/cgi/man.cgi?query=devctl&sektion=4&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports 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 highest matching value.  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.
 
  
The devd utility reads '''/etc/devd.conf''' or the alternate configuration file  specified with a -f option and uses that file to drive the rest of the    process.  While the format of this file is described in [https://www.freebsd.org/cgi/man.cgi?query=devd.conf&apropos=0&sektion=0&manpath=FreeBSD+12.1-RELEASE+and+Ports&arch=default&format=html 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 these directories whose names match the pattern *.conf are parsed. These files are intended to be installed by third party vendors that wish to hook  into the devd system without modifying the user's other config files.
 
  
Since [https://www.freebsd.org/cgi/man.cgi?query=devctl&sektion=4&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports devctl(4)] allows only one active reader, devd multiplexes it, forwarding all events to any number of connected clients.  Clients connect    by opening the SOCK_SEQPACKET UNIX domain socket at  '''/var/run/devd.seqpacket.pipe'''.
 
 
==The Configuration File devd.conf==
 
 
A [https://www.freebsd.org/cgi/man.cgi?query=devd&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports devd(8)] configuration consists of two general features, statements and  comments. All statements end with a semicolon.  Many statements can contain substatements, which are also terminated with a semicolon.
 
 
The following statements are supported:
 
{|class="wikitable" style="width:96.5%;background:#FFFFFF; border:2px solid #008000;text-align:left;padding: 10px"
 
|-
 
! scope="col" style="width: 100px;"|'''Name'''
 
! scope="col" style="width: 350px;"|'''Description'''
 
|-
 
|attach ||Specifies various matching criteria and actions to perform when  a newly attached device matches said criteria.
 
|-
 
|detach ||Specifies various matching criteria and actions to perform when  a newly detached device matches said criteria.
 
|-
 
|nomatch||Specifies various matching criteria and actions to perform when no device driver currently loaded in the kernel claims a (new)    device.
 
|-
 
|notify  || Specifies various matching criteria and actions to perform when  the kernel sends an event notification to userland.
 
|-
 
|options || Specifies various options and parameters for the operation of  [https://www.freebsd.org/cgi/man.cgi?query=devd&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports  devd(8)].
 
|}
 
 
==More Information==
 
 
For more information read
 
* [https://www.freebsd.org/cgi/man.cgi?query=devd.conf&apropos=0&sektion=0&manpath=FreeBSD+12.1-RELEASE+and+Ports&arch=default&format=html the man page]
 
* [https://github.com/OpenRC/openrc/blob/72df51e17ba0e1a0f94451b4bbfb338288c4625c/etc/devd.conf on GitHub]
 
  
 
[[Category:Sysutils]]
 
[[Category:Sysutils]]

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