UDEVD(8)                           Linux Administrator's Manual                          UDEVD(8)



NAME
       udevd, udevdsend - udev event serializer daemon and udev event sender

SYNOPSIS
       udevsend hotplug-subsystem

       The environment must provide the following variables:

       ACTION add or remove signifies the connection or disconnection of a device.

       DEVPATH
              The sysfs devpath of the device without the mountpoint but a leading slash.

       SEQNUM The  sequence  number  of  the  event  provided by the kernel.  If unset, the event
              bypasses the queue and will be executed immediately.

DESCRIPTION
       udevd allows the serialization of hotplug(8) events. The events generated  by  the  kernel
       may arrive in random order in userspace, that makes it neccessary to reorder them.
       udevd takes care of the kernel supplied sequence number and arranges the events for execu-
       tion in the correct order. Missing sequences delay the execution of the  following  events
       until a timeout is reached.
       For  each  event  a udev(8) instance is executed in the background. All further events for
       the same device are delayed until the execution is finished. This way there will never  be
       more than one instance running for a single device at the same time.
       udevd  receives  the  events  from udevsend which is called by hotplug(8).  If udevd isn't
       already running, udevsend will start it.

SEE ALSO
       udev(8), udevinfo(8), hotplug(8)

AUTHORS
       udevd was developed primarily by Kay Sievers <>, with much  help  from
       others.



                                          February 2004                                  UDEVD(8)