1*4882a593Smuzhiyun.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2*4882a593Smuzhiyun.. c:namespace:: DTV.audio 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun.. _audio_fopen: 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun======================= 7*4882a593SmuzhiyunDigital TV audio open() 8*4882a593Smuzhiyun======================= 9*4882a593Smuzhiyun 10*4882a593SmuzhiyunName 11*4882a593Smuzhiyun---- 12*4882a593Smuzhiyun 13*4882a593SmuzhiyunDigital TV audio open() 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun.. attention:: This ioctl is deprecated 16*4882a593Smuzhiyun 17*4882a593SmuzhiyunSynopsis 18*4882a593Smuzhiyun-------- 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun.. c:function:: int open(const char *deviceName, int flags) 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunArguments 23*4882a593Smuzhiyun--------- 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun.. flat-table:: 26*4882a593Smuzhiyun :header-rows: 0 27*4882a593Smuzhiyun :stub-columns: 0 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun - .. row 1 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun - const char \*deviceName 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun - Name of specific audio device. 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun - .. row 2 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun - int flags 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun - A bit-wise OR of the following flags: 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun - .. row 3 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun - 44*4882a593Smuzhiyun - O_RDONLY read-only access 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun - .. row 4 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun - 49*4882a593Smuzhiyun - O_RDWR read/write access 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun - .. row 5 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun - 54*4882a593Smuzhiyun - O_NONBLOCK open in non-blocking mode 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun - .. row 6 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun - 59*4882a593Smuzhiyun - (blocking mode is the default) 60*4882a593Smuzhiyun 61*4882a593SmuzhiyunDescription 62*4882a593Smuzhiyun----------- 63*4882a593Smuzhiyun 64*4882a593SmuzhiyunThis system call opens a named audio device (e.g. 65*4882a593Smuzhiyun/dev/dvb/adapter0/audio0) for subsequent use. When an open() call has 66*4882a593Smuzhiyunsucceeded, the device will be ready for use. The significance of 67*4882a593Smuzhiyunblocking or non-blocking mode is described in the documentation for 68*4882a593Smuzhiyunfunctions where there is a difference. It does not affect the semantics 69*4882a593Smuzhiyunof the open() call itself. A device opened in blocking mode can later be 70*4882a593Smuzhiyunput into non-blocking mode (and vice versa) using the F_SETFL command 71*4882a593Smuzhiyunof the fcntl system call. This is a standard system call, documented in 72*4882a593Smuzhiyunthe Linux manual page for fcntl. Only one user can open the Audio Device 73*4882a593Smuzhiyunin O_RDWR mode. All other attempts to open the device in this mode will 74*4882a593Smuzhiyunfail, and an error code will be returned. If the Audio Device is opened 75*4882a593Smuzhiyunin O_RDONLY mode, the only ioctl call that can be used is 76*4882a593SmuzhiyunAUDIO_GET_STATUS. All other call will return with an error code. 77*4882a593Smuzhiyun 78*4882a593SmuzhiyunReturn Value 79*4882a593Smuzhiyun------------ 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun.. tabularcolumns:: |p{2.5cm}|p{15.0cm}| 82*4882a593Smuzhiyun 83*4882a593Smuzhiyun.. flat-table:: 84*4882a593Smuzhiyun :header-rows: 0 85*4882a593Smuzhiyun :stub-columns: 0 86*4882a593Smuzhiyun 87*4882a593Smuzhiyun - .. row 1 88*4882a593Smuzhiyun 89*4882a593Smuzhiyun - ``ENODEV`` 90*4882a593Smuzhiyun 91*4882a593Smuzhiyun - Device driver not loaded/available. 92*4882a593Smuzhiyun 93*4882a593Smuzhiyun - .. row 2 94*4882a593Smuzhiyun 95*4882a593Smuzhiyun - ``EBUSY`` 96*4882a593Smuzhiyun 97*4882a593Smuzhiyun - Device or resource busy. 98*4882a593Smuzhiyun 99*4882a593Smuzhiyun - .. row 3 100*4882a593Smuzhiyun 101*4882a593Smuzhiyun - ``EINVAL`` 102*4882a593Smuzhiyun 103*4882a593Smuzhiyun - Invalid argument. 104