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- .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
- .. c:namespace:: DTV.dmx
- .. _dmx_fwrite:
- ========================
- Digital TV demux write()
- ========================
- Name
- ----
- Digital TV demux write()
- Synopsis
- --------
- .. c:function:: ssize_t write(int fd, const void *buf, size_t count)
- Arguments
- ---------
- ``fd``
- File descriptor returned by a previous call to :c:func:`open()`.
- ``buf``
- Buffer with data to be written
- ``count``
- 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.
- .. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
- .. flat-table::
- :header-rows: 0
- :stub-columns: 0
- :widths: 1 16
- - - ``EWOULDBLOCK``
- - 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).
- - - ``EBUSY``
- - 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
- :ref:`Generic Error Codes <gen-errors>` chapter.
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