udev rules for webcam

Kevin Cummings cummings at kjchome.homeip.net
Fri Nov 7 20:20:20 UTC 2014

On 11/06/2014 06:53 PM, Tom Horsley wrote:
> On Thu, 6 Nov 2014 18:47:23 -0500
> Fred Smith wrote:
>> not finding anything on that, I hit on writing a udev rule for the
>> USB device to make sure it appeared as a predictable /dev/video<x>.

Did you try looking in /dev/v4l?  My laptop builtin webcam leaves
entries in there.  The v4l directory has 2 sub-directories: by-id and
by-path which contain entries for my webcam.

> I did something similar to recognize my 3D printer when I plug it
> in, and it was quite challenging to make all my code work
> because systemd runs things in magic "cgroups" that get killed
> quickly and have limited permissions. I eventually got all the
> complex stuff I wanted to do working. The full story is here:
> http://home.comcast.net/~tomhorsley/hardware/solidoodle/solidoodle-udev.html

Kevin J. Cummings
kjchome at verizon.net
cummings at kjchome.homeip.net
cummings at kjc386.framingham.ma.us
Registered Linux User #1232 (http://www.linuxcounter.net/)

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