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Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
88 lines
2.2 KiB
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88 lines
2.2 KiB
ReStructuredText
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: DTV.dmx
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.. _dmx_fopen:
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=======================
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Digital TV demux open()
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=======================
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Name
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----
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Digital TV demux open()
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Synopsis
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--------
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.. c:function:: int open(const char *deviceName, int flags)
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Arguments
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---------
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``name``
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Name of specific Digital TV demux device.
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``flags``
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A bit-wise OR of the following flags:
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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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-
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- ``O_RDONLY``
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- read-only access
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-
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- ``O_RDWR``
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- read/write access
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-
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- ``O_NONBLOCK``
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- open in non-blocking mode
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(blocking mode is the default)
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Description
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-----------
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This system call, used with a device name of ``/dev/dvb/adapter?/demux?``,
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allocates a new filter and returns a handle which can be used for
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subsequent control of that filter. This call has to be made for each
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filter to be used, i.e. every returned file descriptor is a reference to
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a single filter. ``/dev/dvb/adapter?/dvr?`` is a logical device to be used
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for retrieving Transport Streams for digital video recording. When
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reading from this device a transport stream containing the packets from
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all PES filters set in the corresponding demux device
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(``/dev/dvb/adapter?/demux?``) having the output set to ``DMX_OUT_TS_TAP``.
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A recorded Transport Stream is replayed by writing to this device.
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The significance of blocking or non-blocking mode is described in the
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documentation for functions where there is a difference. It does not
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affect the semantics of the ``open()`` call itself. A device opened
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in blocking mode can later be put into non-blocking mode (and vice versa)
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using the ``F_SETFL`` command of the fcntl system call.
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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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- - ``EMFILE``
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- "Too many open files", i.e. no more filters available.
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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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