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Diffstat (limited to 'sbin/devd/devd.8')
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diff --git a/sbin/devd/devd.8 b/sbin/devd/devd.8 new file mode 100644 index 0000000..1d22da2 --- /dev/null +++ b/sbin/devd/devd.8 @@ -0,0 +1,88 @@ +.\" +.\" 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 +is a system daemon. +It runs in the background all the time. +When ever a device is added to or removed from the device tree, devd +will cause a certain action to take place. +In addition, when a device that is not matched enters the system, devd +will also perform an action. +.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 +deliver information about the even to +.Nm . +Once +.Nm +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. +.Pp +.Nm reads /etc/devd.conf, and that drives the rest of the process. +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 +wish to hook into the devd system without modifying the user's other +config files. +.Sh SEE ALSO +.Xr devctl 4 , +.Xr devd.conf 5 +.Sh AUTHORS +.An M. Warner Losh |