why VIDIOCSYNC is not working

[Li Tan <litan@xxxxxx>]

Hi, I am using Philips ToU usb cam in redhat 7.2. After I fixed VIDIOCMCAPTURE,

I met another problem that VIDIOCSYNC is not working, and the error is invalid argument.

while(i<0){
 
   i= ioctl(cam,VIDIOCSYNC, &frame); 
   if(i < 0 && errno == EINTR) continue;
   if (i < 0) {       // it start to capture to 
    perror ("VIDIOCSYNC");     // the other buffer.
    exit(-1);
   }
  break;

 

What's wrong with it, is there any special thing for ToU cam?

 

thanks a lot

 

Li