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