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UDEVADM


Section: udevadm (8)
Updated: 11/10/2009
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NAME

udevadm – udev management tool
 

SYNOPSIS



udevadm [--debug] [--version] [--help]

udevadm info options

udevadm trigger [options]

udevadm settle [options]

udevadm control command

udevadm monitor [options]

udevadm test [options] devpath

 

DESCRIPTION

udevadm expects a command and command specific options. It controls the runtime behavior of udev, requests kernel events, manages the event queue, and provides simple debugging mechanisms.
 

OPTIONS

–debug


Print debug messages to stderr.

–version


Print version number.

–help


Print help text.

 

udevadm info options

Queries the udev database for device information stored in the udev database. It can also query the properties of a device from its sysfs representation to help creating udev rules that match this device.

–query=type


Query the database for specified type of device data. It needs the
–path
or
–name
to identify the specified device. Valid queries are:
name,
symlink,
path,
property,
all.

–path=devpath


The devpath of the device to query.

–name=file


The name of the device node or a symlink to query

–root


The udev root directory:
/dev. If used in conjunction with a
name
or
symlink
query, the query returns the absolute path including the root directory.

–attribute-walk


Print all sysfs properties of the specified device that can be used in udev rules to match the specified device. It prints all devices along the chain, up to the root of sysfs that can be used in udev rules.

–device-id-of-file=file


Print major/minor numbers of the underlying device, where the file lives on.

–export-db


Export the content of the udev database.

–version


Print version.

–help


Print help text.

 

udevadm trigger [options]

Request device events from the kernel. Usually used to replay events at system coldplug time.

–verbose


Print the list of devices which will be triggered.

–dry-run


Do not actually trigger the event.

–type=type


Trigger a specific type of devices. Valid types are:
devices,
subsystems,
failed. The default value is
devices.

–action=action


Type of event to be triggered. The default value is
add.

–subsystem-match=subsystem


Trigger events for devices which belong to a matching subsystem. This option can be specified multiple times and supports shell style pattern matching.

–subsystem-nomatch=subsystem


Do not trigger events for devices which belong to a matching subsystem. This option can be specified multiple times and supports shell style pattern matching.

–attr-match=attribute=value


Trigger events for devices with a matching sysfs attribute. If a value is specified along with the attribute name, the content of the attribute is matched against the given value using shell style pattern matching. If no value is specified, the existence of the sysfs attribute is checked. This option can be specified multiple times.

–attr-nomatch=attribute=value


Do not trigger events for devices with a matching sysfs attribute. If a value is specified along with the attribute name, the content of the attribute is matched against the given value using shell style pattern matching. If no value is specified, the existence of the sysfs attribute is checked. This option can be specified multiple times.

–property-match=property=value


Trigger events for devices with a matching property value. This option can be specified multiple times and supports shell style pattern matching.

–sysname-match=name


Trigger events for devices with a matching sys device name. This option can be specified multiple times and supports shell style pattern matching.

 

udevadm settle [options]

Watches the udev event queue, and exits if all current events are handled.

–timeout=seconds


Maximum number of seconds to wait for the event queue to become empty. The default value is 180 seconds. A value of 0 will check if the queue is empty and always return immediately.

–seq-start=seqnum


Wait only for events after the given sequence number.

–seq-end=seqnum


Wait only for events before the given sequence number.

–exit-if-exists=file


Stop waiting if file exists.

–quiet


Do not print any output, like the remaining queue entries when reaching the timeout.

–help


Print help text.

 

udevadm control command

Modify the internal state of the running udev daemon.

–log-priority=value


Set the internal log level of udevd. Valid values are the numerical syslog priorities or their textual representations:
err,
info
and
debug.

–stop-exec-queue


Signal udevd to stop executing new events. Incoming events will be queued.

–start-exec-queue


Signal udevd to enable the execution of events.

–reload-rules


Signal udevd to reload the rules files. The udev daemon detects changes automatically, this option is usually not needed. Reloading rules does not apply any changes to already existing devices.

–property=KEY=value


Set a global property for all events.

–max-childs=value


Set the maximum number of events, udevd will handle at the same time.

–help


Print help text.

 

udevadm monitor [options]

Listens to the kernel uevents and events sent out by a udev rule and prints the devpath of the event to the console. It can be used to analyze the event timing, by comparing the timestamps of the kernel uevent and the udev event.

–kernel


Print the kernel uevents.

–udev


Print the udev event after the rule processing.

–property


Also print the properties of the event.

–help


Print help text.

 

udevadm test [options] devpath

Simulate a udev event run for the given device, and print debug output.

–action=string


The action string.

–subsystem=string


The subsystem string.

–help


Print help text.

 

AUTHOR

Written by Kay Sievers
[email protected].
 

SEE ALSO

udev(7)
udevd(8)



 

Index



NAME

SYNOPSIS

DESCRIPTION

OPTIONS


udevadm info options

udevadm trigger [options]

udevadm settle [options]

udevadm control command

udevadm monitor [options]

udevadm test [options] devpath


AUTHOR

SEE ALSO



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