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udevd(8) [linux man page]

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)

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SYSTEMD-UDEVD.SERVICE(8)				       systemd-udevd.service					  SYSTEMD-UDEVD.SERVICE(8)

NAME
systemd-udevd.service, systemd-udevd-control.socket, systemd-udevd-kernel.socket, systemd-udevd - Device event managing daemon SYNOPSIS
systemd-udevd.service systemd-udevd-control.socket systemd-udevd-kernel.socket /lib/systemd/systemd-udevd [--daemon] [--debug] [--children-max=] [--exec-delay=] [--event-timeout=] [--resolve-names=early|late|never] [--version] [--help] DESCRIPTION
systemd-udevd listens to kernel uevents. For every event, systemd-udevd executes matching instructions specified in udev rules. See udev(7). The behavior of the daemon can be configured using udev.conf(5), its command line options, environment variables, and on the kernel command line, or changed dynamically with udevadm control. OPTIONS
-d, --daemon Detach and run in the background. -D, --debug Print debug messages to standard error. -c=, --children-max= Limit the number of events executed in parallel. -e=, --exec-delay= Delay the execution of RUN instructions by the given number of seconds. This option might be useful when debugging system crashes during coldplug caused by loading non-working kernel modules. -t=, --event-timeout= Set the number of seconds to wait for events to finish. After this time, the event will be terminated. The default is 180 seconds. -N=, --resolve-names= Specify when systemd-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. -h, --help Print a short help text and exit. --version Print a short version string and exit. KERNEL COMMAND LINE
Parameters starting with "rd." will be read when systemd-udevd is used in an initrd. udev.log_priority=, rd.udev.log_priority= Set the log level. udev.children_max=, rd.udev.children_max= Limit the number of events executed in parallel. udev.exec_delay=, rd.udev.exec_delay= Delay the execution of RUN instructions by the given number of seconds. This option might be useful when debugging system crashes during coldplug caused by loading non-working kernel modules. udev.event_timeout=, rd.udev.event_timeout= Wait for events to finish up to the given number of seconds. This option might be useful if events are terminated due to kernel drivers taking too long to initialize. net.ifnames= Network interfaces are renamed to give them predictable names when possible. It is enabled by default; specifying 0 disables it. SEE ALSO
udev.conf(5), udev(7), udevadm(8) systemd 237 SYSTEMD-UDEVD.SERVICE(8)

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