udevd \- udev event serializer daemon
.br
udevsend \- sends the event to udevd
+.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
.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 it will never run more
-than one instance for a single device.
+than one instance for a single device at the same time.
.br
.B udevd
receives the events from
.B udevsend
which is called by
-.BR hotplug (8)
-
+.BR hotplug (8).
+If
+.B udevd
+isn't already running,
+.B udevsend
+will start it.
.SH "SEE ALSO"
-.BR udev (8)
+.BR udev (8),
+.BR udevinfo (8),
+.BR hotplug (8)
.SH AUTHORS
.B udevd
was developed primarily by Kay Sievers <kay.sievers@vrfy.org>, with much help