.TH UDEVD 8 "February 2004" "" "Linux Administrator's Manual"
.SH NAME
-udevd \- udev event serializer daemon
-.br
-udevsend \- sends the event to udevd
+udevd, udevdsend \- udev event serializer daemon and udev event sender
.SH SYNOPSIS
.BI udevsend " hotplug-subsystem"
-.sp
-The environment must provide the following variables:
-.TP
-.B ACTION
-.IR add " or " remove
-signifies the connection or disconnection of a device.
-.TP
-.B DEVPATH
-The sysfs devpath of the device without the mountpoint but a leading slash.
-.TP
-.B SEQNUM
-The sequence number of the event provided by the kernel.
-If unset, the event bypasses the queue and will be executed immediately.
.SH "DESCRIPTION"
.B udevd
allows the serialization of
in userspace, that makes it neccessary to reorder them.
.br
.B udevd
-takes care of the kernel supplied sequence number and arranges the events for
-execution in the correct order. Missing sequences delay the execution of the
-following events until a timeout of a maximum of 5 seconds is reached.
+takes care of the kernel supplied
+.B SEQNUM
+sequence number and arranges the events for execution in the correct order.
+Missing sequences delay the execution of the following events until a timeout
+is reached. Events without any sequence number are bypassing the queue and
+will be executed immediately.
.br
For each event a
.BR 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.
+instance is executed in the background with the complete environment received
+by the hotplug event. 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.
.br
.B udevd
receives the events from
.B udevsend
-which is called by
-.BR hotplug (8).
If
.B udevd
isn't already running,
~ianmdlvl / elogind.git / blobdiff