int ioctl(int fd, int request = DMX_SET_BUFFER_SIZE, unsigned long size) Arguments

int fd File descriptor returned by a previous call to open().
int request Equals DMX_SET_BUFFER_SIZE for this command.
unsigned long size Size of circular buffer. Description

This ioctl call is used to set the size of the circular buffer used for filtered data. The default size is two maximum sized sections, i.e. if this function is not called a buffer size of 2 * 4096 bytes will be used. Return Value

On success 0 is returned, on error -1 and the errno variable is set appropriately. The generic error codes are described at the Generic Error Codes chapter.