02-25-2014
udev manages device nodes. The kernel sends events to the udev daemon whenever a device is discovered or removed. Then udev uses a collection of rules to create or remove device nodes in the filesystem or perform other actions.
udev does not load or unload kernel drivers.
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UDEVD(8) udevd UDEVD(8)
NAME
udevd - event managing daemon
SYNOPSIS
udevd [--daemon] [--debug] [--children-max=] [--exec-delay=] [--resolve-names=early|late|never] [--version] [--help]
DESCRIPTION
udevd listens to kernel uevents. For every event, udevd executes matching instructions specified in udev rules. See udev(7).
On startup the content of the directory /lib/udev/devices is copied to /dev. If kernel modules specify static device nodes, these nodes are
created even without a corresponding kernel device, to allow on-demand loading of kernel modules. Matching permissions specified in udev
rules are applied to these static device nodes.
The behavior of the running daemon can be changed with udevadm control.
OPTIONS
--daemon
Detach and run in the background.
--debug
Print debug messages to stderr.
--children-max=
Limit the number of parallel executed events.
--exec-delay=
Number of seconds to delay the execution of RUN instructions. This might be useful when debugging system crashes during coldplug cause
by loading non-working kernel modules.
--resolve-names=
Specify when udevd should resolve names of users and groups. When set to early (the default) names will be resolved when the rules are
parsed. When set to late names will be resolved for every event. When set to never names will never be resolved and all devices will be
owned by root.
--version
Print version number.
--help
Print help text.
ENVIRONMENT
UDEV_LOG=
Set the logging priority.
KERNEL COMMAND LINE
udev.log-priority=
Set the logging priority.
udev.children-max=
Limit the number of parallel executed events.
udev.exec-delay=
Number of seconds to delay the execution of RUN instructions. This might be useful when debugging system crashes during coldplug cause
by loading non-working kernel modules.
AUTHOR
Written by Kay Sievers kay.sievers@vrfy.org.
SEE ALSO
udev(7), udevadm(8)
udev 07/30/2011 UDEVD(8)