projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 47d23e36 MCC |
1 | .. -*- coding: utf-8; mode: rst -*- |
| 2 | ||
| 3 | .. _audio_fopen: | |
| 4 | ||
| 586027ce | 5 | ================ |
| 47d23e36 MCC |
6 | DVB audio open() |
| 7 | ================ | |
| 8 | ||
| 15e7d615 | 9 | Name |
| 586027ce | 10 | ---- |
| 47d23e36 | 11 | |
| 586027ce | 12 | DVB audio open() |
| 47d23e36 | 13 | |
| 15e7d615 MCC |
14 | |
| 15 | Synopsis | |
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16 | -------- |
| 17 | ||
| 1b81f010 | 18 | .. c:function:: int open(const char *deviceName, int flags) |
| 47d23e36 | 19 | |
| 47d23e36 | 20 | |
| 15e7d615 | 21 | Arguments |
| 586027ce | 22 | --------- |
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23 | |
| 24 | .. flat-table:: | |
| 25 | :header-rows: 0 | |
| 26 | :stub-columns: 0 | |
| 27 | ||
| 28 | ||
| 29 | - .. row 1 | |
| 30 | ||
| 31 | - const char \*deviceName | |
| 32 | ||
| 33 | - Name of specific audio device. | |
| 34 | ||
| 35 | - .. row 2 | |
| 36 | ||
| 37 | - int flags | |
| 38 | ||
| 39 | - A bit-wise OR of the following flags: | |
| 40 | ||
| 41 | - .. row 3 | |
| 42 | ||
| 43 | - | |
| 44 | - O_RDONLY read-only access | |
| 45 | ||
| 46 | - .. row 4 | |
| 47 | ||
| 48 | - | |
| 49 | - O_RDWR read/write access | |
| 50 | ||
| 51 | - .. row 5 | |
| 52 | ||
| 53 | - | |
| 54 | - O_NONBLOCK open in non-blocking mode | |
| 55 | ||
| 56 | - .. row 6 | |
| 57 | ||
| 58 | - | |
| 59 | - (blocking mode is the default) | |
| 60 | ||
| 61 | ||
| 15e7d615 | 62 | Description |
| 586027ce | 63 | ----------- |
| 47d23e36 | 64 | |
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65 | This system call opens a named audio device (e.g. |
| 66 | /dev/dvb/adapter0/audio0) for subsequent use. When an open() call has | |
| 67 | succeeded, the device will be ready for use. The significance of | |
| 68 | blocking or non-blocking mode is described in the documentation for | |
| 69 | functions where there is a difference. It does not affect the semantics | |
| 70 | of the open() call itself. A device opened in blocking mode can later be | |
| 71 | put into non-blocking mode (and vice versa) using the F_SETFL command | |
| 72 | of the fcntl system call. This is a standard system call, documented in | |
| 73 | the Linux manual page for fcntl. Only one user can open the Audio Device | |
| 74 | in O_RDWR mode. All other attempts to open the device in this mode will | |
| 75 | fail, and an error code will be returned. If the Audio Device is opened | |
| 76 | in O_RDONLY mode, the only ioctl call that can be used is | |
| 77 | AUDIO_GET_STATUS. All other call will return with an error code. | |
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78 | |
| 79 | ||
| 15e7d615 | 80 | Return Value |
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81 | ------------ |
| 82 | ||
| 16dac354 MCC |
83 | .. tabularcolumns:: |p{2.5cm}|p{15.0cm}| |
| 84 | ||
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85 | .. flat-table:: |
| 86 | :header-rows: 0 | |
| 87 | :stub-columns: 0 | |
| 88 | ||
| 89 | ||
| 90 | - .. row 1 | |
| 91 | ||
| 92 | - ``ENODEV`` | |
| 93 | ||
| 94 | - Device driver not loaded/available. | |
| 95 | ||
| 96 | - .. row 2 | |
| 97 | ||
| 98 | - ``EBUSY`` | |
| 99 | ||
| 100 | - Device or resource busy. | |
| 101 | ||
| 102 | - .. row 3 | |
| 103 | ||
| 104 | - ``EINVAL`` | |
| 105 | ||
| 106 | - Invalid argument. |