1 What: /sys/.../uevent
2 Date: May 2017
3 KernelVersion: 4.13
4 Contact: Linux kernel mailing list <linu
5 Description:
6 Enable passing additional vari
7 are generated by writing /sys/
8
9 Recognized extended format is:
10
11 ACTION [UUID [KEY=VALU
12
13 The ACTION is compulsory - it
14 action (``add``, ``change``, `
15 compared to previous functiona
16 extended format is optional.
17
18 You need to pass UUID first be
19 The UUID must be in ``xxxxxxxx
20 format where 'x' is a hex digi
21 a transaction identifier so it
22 value for one or more syntheti
23 logically group these uevents
24 listeners. The UUID value appe
25 ``SYNTH_UUID=xxxxxxxx-xxxx-xxx
26 variable.
27
28 If UUID is not passed in, the
29 ``SYNTH_UUID=0`` environment v
30
31 The KEY=VALUE pairs can contai
32
33 It's possible to define zero o
34 delimited by a space character
35 synthetic uevent as ``SYNTH_AR
36 name gains ``SYNTH_ARG_`` pref
37 with existing variables.
38
39 Example of valid sequence writ
40
41 add fe4d7c9d-b8c6-4a70-9ef
42
43 This generates synthetic ueven
44
45 ACTION=add
46 SYNTH_ARG_A=1
47 SYNTH_ARG_B=abc
48 SYNTH_UUID=fe4d7c9d-b8c6-4
49
50 Users:
51 udev, userspace tools generati
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