18c2ecf20Sopenharmony_ci.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 28c2ecf20Sopenharmony_ci.. c:namespace:: DTV.dmx 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci.. _dmx_fopen: 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci======================= 78c2ecf20Sopenharmony_ciDigital TV demux open() 88c2ecf20Sopenharmony_ci======================= 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ciName 118c2ecf20Sopenharmony_ci---- 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ciDigital TV demux open() 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ciSynopsis 168c2ecf20Sopenharmony_ci-------- 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_ci.. c:function:: int open(const char *deviceName, int flags) 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_ciArguments 218c2ecf20Sopenharmony_ci--------- 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci``name`` 248c2ecf20Sopenharmony_ci Name of specific Digital TV demux device. 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ci``flags`` 278c2ecf20Sopenharmony_ci A bit-wise OR of the following flags: 288c2ecf20Sopenharmony_ci 298c2ecf20Sopenharmony_ci.. tabularcolumns:: |p{2.5cm}|p{15.0cm}| 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_ci.. flat-table:: 328c2ecf20Sopenharmony_ci :header-rows: 0 338c2ecf20Sopenharmony_ci :stub-columns: 0 348c2ecf20Sopenharmony_ci :widths: 1 16 358c2ecf20Sopenharmony_ci 368c2ecf20Sopenharmony_ci - 378c2ecf20Sopenharmony_ci - ``O_RDONLY`` 388c2ecf20Sopenharmony_ci - read-only access 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_ci - 418c2ecf20Sopenharmony_ci - ``O_RDWR`` 428c2ecf20Sopenharmony_ci - read/write access 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ci - 458c2ecf20Sopenharmony_ci - ``O_NONBLOCK`` 468c2ecf20Sopenharmony_ci - open in non-blocking mode 478c2ecf20Sopenharmony_ci (blocking mode is the default) 488c2ecf20Sopenharmony_ci 498c2ecf20Sopenharmony_ciDescription 508c2ecf20Sopenharmony_ci----------- 518c2ecf20Sopenharmony_ci 528c2ecf20Sopenharmony_ciThis system call, used with a device name of ``/dev/dvb/adapter?/demux?``, 538c2ecf20Sopenharmony_ciallocates a new filter and returns a handle which can be used for 548c2ecf20Sopenharmony_cisubsequent control of that filter. This call has to be made for each 558c2ecf20Sopenharmony_cifilter to be used, i.e. every returned file descriptor is a reference to 568c2ecf20Sopenharmony_cia single filter. ``/dev/dvb/adapter?/dvr?`` is a logical device to be used 578c2ecf20Sopenharmony_cifor retrieving Transport Streams for digital video recording. When 588c2ecf20Sopenharmony_cireading from this device a transport stream containing the packets from 598c2ecf20Sopenharmony_ciall PES filters set in the corresponding demux device 608c2ecf20Sopenharmony_ci(``/dev/dvb/adapter?/demux?``) having the output set to ``DMX_OUT_TS_TAP``. 618c2ecf20Sopenharmony_ciA recorded Transport Stream is replayed by writing to this device. 628c2ecf20Sopenharmony_ci 638c2ecf20Sopenharmony_ciThe significance of blocking or non-blocking mode is described in the 648c2ecf20Sopenharmony_cidocumentation for functions where there is a difference. It does not 658c2ecf20Sopenharmony_ciaffect the semantics of the ``open()`` call itself. A device opened 668c2ecf20Sopenharmony_ciin blocking mode can later be put into non-blocking mode (and vice versa) 678c2ecf20Sopenharmony_ciusing the ``F_SETFL`` command of the fcntl system call. 688c2ecf20Sopenharmony_ci 698c2ecf20Sopenharmony_ciReturn Value 708c2ecf20Sopenharmony_ci------------ 718c2ecf20Sopenharmony_ci 728c2ecf20Sopenharmony_ciOn success 0 is returned. 738c2ecf20Sopenharmony_ci 748c2ecf20Sopenharmony_ciOn error -1 is returned, and the ``errno`` variable is set 758c2ecf20Sopenharmony_ciappropriately. 768c2ecf20Sopenharmony_ci 778c2ecf20Sopenharmony_ci.. tabularcolumns:: |p{2.5cm}|p{15.0cm}| 788c2ecf20Sopenharmony_ci 798c2ecf20Sopenharmony_ci.. flat-table:: 808c2ecf20Sopenharmony_ci :header-rows: 0 818c2ecf20Sopenharmony_ci :stub-columns: 0 828c2ecf20Sopenharmony_ci :widths: 1 16 838c2ecf20Sopenharmony_ci 848c2ecf20Sopenharmony_ci - - ``EMFILE`` 858c2ecf20Sopenharmony_ci - “Too many open files”, i.e. no more filters available. 868c2ecf20Sopenharmony_ci 878c2ecf20Sopenharmony_ciThe generic error codes are described at the 888c2ecf20Sopenharmony_ci:ref:`Generic Error Codes <gen-errors>` chapter. 89