3.2.4. Digital TV demux write() Name

Digital TV demux write() Synopsis

ssize_t write(int fd, const void *buf, size_t count) Arguments


File descriptor returned by a previous call to open().


Buffer with data to be written


Number of bytes at the buffer Description

This system call is only provided by the logical device /dev/dvb/adapter?/dvr?, associated with the physical demux device that provides the actual DVR functionality. It is used for replay of a digitally recorded Transport Stream. Matching filters have to be defined in the corresponding physical demux device, /dev/dvb/adapter?/demux?. The amount of data to be transferred is implied by count. Return Value

On success 0 is returned.

On error -1 is returned, and the errno variable is set appropriately.


No data was written. This might happen if O_NONBLOCK was specified and there is no more buffer space available (if O_NONBLOCK is not specified the function will block until buffer space is available).


This error code indicates that there are conflicting requests. The corresponding demux device is setup to receive data from the front- end. Make sure that these filters are stopped and that the filters with input set to DMX_IN_DVR are started.

The generic error codes are described at the Generic Error Codes chapter.