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70 lines
1.8 KiB
70 lines
1.8 KiB
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
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.. c:namespace:: DTV.dmx |
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.. _dmx_fwrite: |
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======================== |
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Digital TV demux write() |
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======================== |
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Name |
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---- |
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Digital TV demux write() |
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Synopsis |
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-------- |
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.. c:function:: ssize_t write(int fd, const void *buf, size_t count) |
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Arguments |
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--------- |
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``fd`` |
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File descriptor returned by a previous call to :c:func:`open()`. |
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``buf`` |
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Buffer with data to be written |
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``count`` |
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Number of bytes at the buffer |
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Description |
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----------- |
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This system call is only provided by the logical device |
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``/dev/dvb/adapter?/dvr?``, associated with the physical demux device that |
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provides the actual DVR functionality. It is used for replay of a |
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digitally recorded Transport Stream. Matching filters have to be defined |
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in the corresponding physical demux device, ``/dev/dvb/adapter?/demux?``. |
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The amount of data to be transferred is implied by count. |
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Return Value |
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------------ |
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On success 0 is returned. |
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On error -1 is returned, and the ``errno`` variable is set |
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appropriately. |
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.. tabularcolumns:: |p{2.5cm}|p{15.0cm}| |
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.. flat-table:: |
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:header-rows: 0 |
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:stub-columns: 0 |
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:widths: 1 16 |
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- - ``EWOULDBLOCK`` |
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- No data was written. This might happen if ``O_NONBLOCK`` was |
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specified and there is no more buffer space available (if |
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``O_NONBLOCK`` is not specified the function will block until buffer |
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space is available). |
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- - ``EBUSY`` |
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- This error code indicates that there are conflicting requests. The |
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corresponding demux device is setup to receive data from the |
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front- end. Make sure that these filters are stopped and that the |
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filters with input set to ``DMX_IN_DVR`` are started. |
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The generic error codes are described at the |
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:ref:`Generic Error Codes <gen-errors>` chapter.
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