1*4882a593Smuzhiyun.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2*4882a593Smuzhiyun.. c:namespace:: DTV.dmx 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun.. _dmx_fopen: 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun======================= 7*4882a593SmuzhiyunDigital TV demux open() 8*4882a593Smuzhiyun======================= 9*4882a593Smuzhiyun 10*4882a593SmuzhiyunName 11*4882a593Smuzhiyun---- 12*4882a593Smuzhiyun 13*4882a593SmuzhiyunDigital TV demux open() 14*4882a593Smuzhiyun 15*4882a593SmuzhiyunSynopsis 16*4882a593Smuzhiyun-------- 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun.. c:function:: int open(const char *deviceName, int flags) 19*4882a593Smuzhiyun 20*4882a593SmuzhiyunArguments 21*4882a593Smuzhiyun--------- 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun``name`` 24*4882a593Smuzhiyun Name of specific Digital TV demux device. 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun``flags`` 27*4882a593Smuzhiyun A bit-wise OR of the following flags: 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun.. tabularcolumns:: |p{2.5cm}|p{15.0cm}| 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun.. flat-table:: 32*4882a593Smuzhiyun :header-rows: 0 33*4882a593Smuzhiyun :stub-columns: 0 34*4882a593Smuzhiyun :widths: 1 16 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun - 37*4882a593Smuzhiyun - ``O_RDONLY`` 38*4882a593Smuzhiyun - read-only access 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun - 41*4882a593Smuzhiyun - ``O_RDWR`` 42*4882a593Smuzhiyun - read/write access 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun - 45*4882a593Smuzhiyun - ``O_NONBLOCK`` 46*4882a593Smuzhiyun - open in non-blocking mode 47*4882a593Smuzhiyun (blocking mode is the default) 48*4882a593Smuzhiyun 49*4882a593SmuzhiyunDescription 50*4882a593Smuzhiyun----------- 51*4882a593Smuzhiyun 52*4882a593SmuzhiyunThis system call, used with a device name of ``/dev/dvb/adapter?/demux?``, 53*4882a593Smuzhiyunallocates a new filter and returns a handle which can be used for 54*4882a593Smuzhiyunsubsequent control of that filter. This call has to be made for each 55*4882a593Smuzhiyunfilter to be used, i.e. every returned file descriptor is a reference to 56*4882a593Smuzhiyuna single filter. ``/dev/dvb/adapter?/dvr?`` is a logical device to be used 57*4882a593Smuzhiyunfor retrieving Transport Streams for digital video recording. When 58*4882a593Smuzhiyunreading from this device a transport stream containing the packets from 59*4882a593Smuzhiyunall PES filters set in the corresponding demux device 60*4882a593Smuzhiyun(``/dev/dvb/adapter?/demux?``) having the output set to ``DMX_OUT_TS_TAP``. 61*4882a593SmuzhiyunA recorded Transport Stream is replayed by writing to this device. 62*4882a593Smuzhiyun 63*4882a593SmuzhiyunThe significance of blocking or non-blocking mode is described in the 64*4882a593Smuzhiyundocumentation for functions where there is a difference. It does not 65*4882a593Smuzhiyunaffect the semantics of the ``open()`` call itself. A device opened 66*4882a593Smuzhiyunin blocking mode can later be put into non-blocking mode (and vice versa) 67*4882a593Smuzhiyunusing the ``F_SETFL`` command of the fcntl system call. 68*4882a593Smuzhiyun 69*4882a593SmuzhiyunReturn Value 70*4882a593Smuzhiyun------------ 71*4882a593Smuzhiyun 72*4882a593SmuzhiyunOn success 0 is returned. 73*4882a593Smuzhiyun 74*4882a593SmuzhiyunOn error -1 is returned, and the ``errno`` variable is set 75*4882a593Smuzhiyunappropriately. 76*4882a593Smuzhiyun 77*4882a593Smuzhiyun.. tabularcolumns:: |p{2.5cm}|p{15.0cm}| 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun.. flat-table:: 80*4882a593Smuzhiyun :header-rows: 0 81*4882a593Smuzhiyun :stub-columns: 0 82*4882a593Smuzhiyun :widths: 1 16 83*4882a593Smuzhiyun 84*4882a593Smuzhiyun - - ``EMFILE`` 85*4882a593Smuzhiyun - “Too many open files”, i.e. no more filters available. 86*4882a593Smuzhiyun 87*4882a593SmuzhiyunThe generic error codes are described at the 88*4882a593Smuzhiyun:ref:`Generic Error Codes <gen-errors>` chapter. 89