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I have this (hopefully) irrational fear someone might hijack my webcam, especially since some of my colleagues started to put some tape around theirs.

For some reason I am sometimes not able to access /dev/video0 while using skype. A while ago I made the experience that only one process can access my camera.

How can I find out which process (if?) is currently using my webcam? Also how can I unmount and re-mount the webcam?

Thank you

21
$ lsof /dev/video0

Should tell you which processes are accessing the device, if any.

| improve this answer | |
  • Seems nothing is accessing it. How to mount/unmount it? – Qohelet Feb 6 '15 at 4:12
  • You don't mount a video device - for testing just fire up any app that makes use of it .... – tink Dec 5 '19 at 18:28

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