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1 | .TH UDEVD 8 "February 2004" "" "Linux Administrator's Manual" |
2 | .SH NAME | |
9d009843 | 3 | udevd, udevdsend \- udev event serializer daemon and udev event sender |
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4 | .SH SYNOPSIS |
5 | .BI udevsend " hotplug-subsystem" | |
6 | .sp | |
7 | The environment must provide the following variables: | |
8 | .TP | |
9 | .B ACTION | |
10 | .IR add " or " remove | |
11 | signifies the connection or disconnection of a device. | |
12 | .TP | |
13 | .B DEVPATH | |
14 | The sysfs devpath of the device without the mountpoint but a leading slash. | |
15 | .TP | |
16 | .B SEQNUM | |
17 | The sequence number of the event provided by the kernel. | |
18 | If unset, the event bypasses the queue and will be executed immediately. | |
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19 | .SH "DESCRIPTION" |
20 | .B udevd | |
21 | allows the serialization of | |
22 | .BR hotplug (8) | |
23 | events. The events generated by the kernel may arrive in random order | |
b86f56ff | 24 | in userspace, that makes it neccessary to reorder them. |
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25 | .br |
26 | .B udevd | |
27 | takes care of the kernel supplied sequence number and arranges the events for | |
b86f56ff | 28 | execution in the correct order. Missing sequences delay the execution of the |
4ef51da9 | 29 | following events until a timeout is reached. |
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30 | .br |
31 | For each event a | |
32 | .BR udev (8) | |
33 | instance is executed in the background. All further events for the same device | |
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34 | are delayed until the execution is finished. This way there will never be more |
35 | than one instance running for a single device at the same time. | |
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36 | .br |
37 | .B udevd | |
38 | receives the events from | |
39 | .B udevsend | |
40 | which is called by | |
ad63031e KS |
41 | .BR hotplug (8). |
42 | If | |
43 | .B udevd | |
44 | isn't already running, | |
45 | .B udevsend | |
46 | will start it. | |
7dae391f | 47 | .SH "SEE ALSO" |
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48 | .BR udev (8), |
49 | .BR udevinfo (8), | |
50 | .BR hotplug (8) | |
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51 | .SH AUTHORS |
52 | .B udevd | |
53 | was developed primarily by Kay Sievers <kay.sievers@vrfy.org>, with much help | |
54 | from others. |