6.9. ioctl MEDIA_IOC_REQUEST_ALLOC¶
MEDIA_IOC_REQUEST_ALLOC - Allocate a request
If the media device supports requests, then
this ioctl can be used to allocate a request. If it is not supported, then
errno is set to
ENOTTY. A request is accessed through a file descriptor
that is returned in
Finally, the file descriptor can be polled to wait for the request to complete.