Проект OpenNet: MAN devd (8) Команды системного администрирования (FreeBSD и Linux)

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devd (8)

>> devd (8) ( FreeBSD man: Команды системного администрирования )

devd (8) ( Русские man: Команды системного администрирования )

BSD mandoc

NAME



devd

 - device state change daemon

SYNOPSIS

[-Ddn ] [-f file ]

DESCRIPTION

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

The following options are accepted.

-D: Enable debugging messages.
-d: Run in the foreground instead of becoming a daemon.
-f file: Use configuration file file instead of the default /etc/devd.conf If option -f is specified more than once, the last file specified is used.
-n: Do not process all pending events before becoming a daemon. Instead, call daemon right away.

IMPLEMENTATION NOTES

The 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, will execute actions specified in devd.conf5. For example, 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 to use a table to locate and load via kldload(8) the proper driver for an unrecognized device that is added to the system.

The utility 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 . Once 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 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 devd.conf5, some basics are covered here. #include <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 system without modifying the user's other config files.

All messages that receives are forwarded to the UNIX domain socket at /var/run/devd.pipe