this->data = (unsigned char*)shmat(shmid, NULL, 0);
if( this->data == (unsigned char*)-1 ) {
printf("VFrame::allocate_data %d could not attach"
this->data = (unsigned char*)shmat(shmid, NULL, 0);
if( this->data == (unsigned char*)-1 ) {
printf("VFrame::allocate_data %d could not attach"