udevd
event managing daemon
see also :
udevadm
Synopsis
udevd
[--daemon] [--debug]
[--children-max=]
[--exec-delay=]
[--resolve-names=early|late|never]
[--version]
[--help]
add an example, a script, a trick and tips
examples
source
function _deploy_package {
_deploy_static_elf /udevd.elf /udev/udevd
_deploy_static_elf /udevadm.elf /udev/udevadm
_deploy_file /libudev.a /libudev/.libs/libudev.a
(
_output_cpiod_bin_file /udevd /udevd.elf
_output_cpiod_bin_file /udevadm /udevadm.elf
) | _deploy_cpiod /generic-bin.cpiod
}
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.
see also
udev,
udevadm
author
Written by Kay
Sievers kay.sievers[:at:]vrfy[:dot:]org.