UVC ioctl call is failing

Manoj Tiwary manojtiwary22 at gmail.com
Fri Jun 28 07:37:59 EDT 2019

Hi All,

I have iCatch camera connected to my ubuntu 16.04 desktop, I'm trying to
use GET_CUR and SET_CUR commands to control the camera Extension Unit.

I have a common api for both get and set which first queries the camera
with get_len and then send get or set command.

But When I call a set or get command repeatedly without any delay, the
ioctl is failing due to timeout, If I set UVC_CTRL_CONTROL_TIMEOUT to 0
(infinite) or more or delay between (min 2 sec ) get and set commands It
will complete successfully.

But same thing is working when I tried in windows.

Is delay required between repeated ioctl calls? If so, why?

Thank you,
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