2 .\" Copyright (c) 2002 M. Warner Losh.
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
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26 .\" $FreeBSD: src/sbin/devd/devd.8,v 1.17 2006/09/17 22:49:26 ru Exp $
27 .\" $DragonFly: src/sbin/devd/devd.8,v 1.2 2008/10/03 10:30:43 swildner Exp $
34 .Nd "device state change daemon"
42 daemon provides a way to have userland programs run when certain
45 The following options are accepted.
46 .Bl -tag -width ".Fl f Ar file"
48 Enable debugging messages.
50 Run in the foreground instead of becoming a daemon.
52 Use configuration file
54 instead of the default
58 is specified more than once, the last file specified is used.
60 Do not process all pending events before becoming a daemon.
61 Instead, call daemon right away.
63 .Sh IMPLEMENTATION NOTES
67 is a system daemon that runs in the background all the time.
68 Whenever a device is added to or removed from the device tree,
70 will execute actions specified in
76 when an Ethernet adapter is added to the system, and kill the
78 instance when the same adapter is removed.
79 Another example would be for
81 to use a table to locate and load via
83 the proper driver for an unrecognized device that is added to the system.
91 This device driver has hooks into the device configuration system.
92 When nodes are added or deleted from the tree, this device will
93 deliver information about the event to
97 has parsed the message, it will search its action list for that kind
98 of event and perform the action with the highest matching value.
99 For most mundane uses, the default handlers are adequate.
100 However, for more advanced users, the power is present to tweak every
101 aspect of what happens.
108 or the alternate configuration file specified with a
110 option and uses that file to drive the rest of the process.
111 While the format of this file is described in
113 some basics are covered here.
116 section, one can define multiple directories to search
118 All files in these directories whose names match the pattern
121 These files are intended to be installed by third party vendors that
122 wish to hook into the
124 system without modifying the user's other
129 receives are forwarded to the
132 .Pa /var/run/devd.pipe .
134 .Bl -tag -width ".Pa /var/run/devd.pipe" -compact
135 .It Pa /etc/devd.conf
139 .It Pa /var/run/devd.pipe
142 to communicate with its clients.