Re: [Linux-uvc-devel] [SVN] Added preliminary pan/tilt support for Quickcam Orbit MP

[Laurent P. <lau...@sk...>]

> Well another question I use :
> int err =0;
>     queryctrl->id = control;
>     if ((err= ioctl(vd->fd, VIDIOC_QUERYCTRL, queryctrl)) < 0) {
> 	printf("ioctl querycontrol error %d \n",err);
> to verify the control V4L2_CID_PANTILT_RESET  exist
>  for some strange reason the ioctl return -EPERM ?

Print errno instead of err. ioctl() returns -1 (== -EPERM) in case of failure. 
The error code is stored in errno.

Laurent Pinchart