3.2.3. Digital TV demux read()¶
Digital TV demux read()
- File descriptor returned by a previous call to
- Buffer to be filled
- Max number of bytes to read
This system call returns filtered data, which might be section or Packetized
Elementary Stream (PES) data. The filtered data is transferred from
the driver’s internal circular buffer to
buf. The maximum amount of data
to be transferred is implied by count.
if a section filter created with
DMX_CHECK_CRC flag set,
data that fails on CRC check will be silently ignored.
18.104.22.168. Return Value¶
On success 0 is returned.
On error -1 is returned, and the
errno variable is set
||No data to return and
||The filtered data was not read from the buffer in due time, resulting in non-read data being lost. The buffer is flushed.|
||The section was not loaded within the stated timeout period. See ioctl DMX_SET_FILTER for how to set a timeout.|
||The driver failed to write to the callers buffer due to an invalid *buf pointer.|
The generic error codes are described at the Generic Error Codes chapter.