.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later .. c:namespace:: DTV.dmx .. _dmx_fopen: ======================= Digital TV demux open() ======================= Name ---- Digital TV demux open() Synopsis -------- .. c:function:: int open(const char *deviceName, int flags) Arguments --------- ``name`` Name of specific Digital TV demux device. ``flags`` A bit-wise OR of the following flags: .. tabularcolumns:: |p{2.5cm}|p{15.0cm}| .. flat-table:: :header-rows: 0 :stub-columns: 0 :widths: 1 16 - - ``O_RDONLY`` - read-only access - - ``O_RDWR`` - read/write access - - ``O_NONBLOCK`` - open in non-blocking mode (blocking mode is the default) Description ----------- This system call, used with a device name of ``/dev/dvb/adapter?/demux?``, allocates a new filter and returns a handle which can be used for subsequent control of that filter. This call has to be made for each filter to be used, i.e. every returned file descriptor is a reference to a single filter. ``/dev/dvb/adapter?/dvr?`` is a logical device to be used for retrieving Transport Streams for digital video recording. When reading from this device a transport stream containing the packets from all PES filters set in the corresponding demux device (``/dev/dvb/adapter?/demux?``) having the output set to ``DMX_OUT_TS_TAP``. A recorded Transport Stream is replayed by writing to this device. The significance of blocking or non-blocking mode is described in the documentation for functions where there is a difference. It does not affect the semantics of the ``open()`` call itself. A device opened in blocking mode can later be put into non-blocking mode (and vice versa) using the ``F_SETFL`` command of the fcntl system call. 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 - - ``EMFILE`` - "Too many open files", i.e. no more filters available. The generic error codes are described at the :ref:`Generic Error Codes ` chapter.