projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 47d23e36 MCC |
1 | .. -*- coding: utf-8; mode: rst -*- |
| 2 | ||
| 3 | .. _video_fopen: | |
| 4 | ||
| 586027ce | 5 | ================ |
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6 | dvb video open() |
| 7 | ================ | |
| 8 | ||
| 15e7d615 | 9 | Name |
| 586027ce | 10 | ---- |
| 47d23e36 | 11 | |
| 586027ce | 12 | dvb video open() |
| 47d23e36 | 13 | |
| cf8076c3 | 14 | .. attention:: This ioctl is deprecated. |
| 15e7d615 MCC |
15 | |
| 16 | Synopsis | |
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17 | -------- |
| 18 | ||
| 1b81f010 | 19 | .. c:function:: int open(const char *deviceName, int flags) |
| 47d23e36 | 20 | |
| 586027ce | 21 | |
| 15e7d615 | 22 | Arguments |
| 586027ce | 23 | --------- |
| 47d23e36 MCC |
24 | |
| 25 | .. flat-table:: | |
| 26 | :header-rows: 0 | |
| 27 | :stub-columns: 0 | |
| 28 | ||
| 29 | ||
| 30 | - .. row 1 | |
| 31 | ||
| 32 | - const char \*deviceName | |
| 33 | ||
| 34 | - Name of specific video device. | |
| 35 | ||
| 36 | - .. row 2 | |
| 37 | ||
| 38 | - int flags | |
| 39 | ||
| 40 | - A bit-wise OR of the following flags: | |
| 41 | ||
| 42 | - .. row 3 | |
| 43 | ||
| 44 | - | |
| 45 | - O_RDONLY read-only access | |
| 46 | ||
| 47 | - .. row 4 | |
| 48 | ||
| 49 | - | |
| 50 | - O_RDWR read/write access | |
| 51 | ||
| 52 | - .. row 5 | |
| 53 | ||
| 54 | - | |
| 55 | - O_NONBLOCK open in non-blocking mode | |
| 56 | ||
| 57 | - .. row 6 | |
| 58 | ||
| 59 | - | |
| 60 | - (blocking mode is the default) | |
| 61 | ||
| 62 | ||
| 15e7d615 | 63 | Description |
| 586027ce | 64 | ----------- |
| 47d23e36 | 65 | |
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66 | This system call opens a named video device (e.g. |
| 67 | /dev/dvb/adapter0/video0) for subsequent use. | |
| 68 | ||
| 69 | When an open() call has succeeded, the device will be ready for use. The | |
| 70 | significance of blocking or non-blocking mode is described in the | |
| 71 | documentation for functions where there is a difference. It does not | |
| 72 | affect the semantics of the open() call itself. A device opened in | |
| 73 | blocking mode can later be put into non-blocking mode (and vice versa) | |
| 74 | using the F_SETFL command of the fcntl system call. This is a standard | |
| 75 | system call, documented in the Linux manual page for fcntl. Only one | |
| 76 | user can open the Video Device in O_RDWR mode. All other attempts to | |
| 77 | open the device in this mode will fail, and an error-code will be | |
| 78 | returned. If the Video Device is opened in O_RDONLY mode, the only | |
| 79 | ioctl call that can be used is VIDEO_GET_STATUS. All other call will | |
| 80 | return an error code. | |
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81 | |
| 82 | ||
| 15e7d615 | 83 | Return Value |
| 586027ce MCC |
84 | ------------ |
| 85 | ||
| 16dac354 MCC |
86 | .. tabularcolumns:: |p{2.5cm}|p{15.0cm}| |
| 87 | ||
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88 | .. flat-table:: |
| 89 | :header-rows: 0 | |
| 90 | :stub-columns: 0 | |
| 91 | ||
| 92 | ||
| 93 | - .. row 1 | |
| 94 | ||
| 95 | - ``ENODEV`` | |
| 96 | ||
| 97 | - Device driver not loaded/available. | |
| 98 | ||
| 99 | - .. row 2 | |
| 100 | ||
| 101 | - ``EINTERNAL`` | |
| 102 | ||
| 103 | - Internal error. | |
| 104 | ||
| 105 | - .. row 3 | |
| 106 | ||
| 107 | - ``EBUSY`` | |
| 108 | ||
| 109 | - Device or resource busy. | |
| 110 | ||
| 111 | - .. row 4 | |
| 112 | ||
| 113 | - ``EINVAL`` | |
| 114 | ||
| 115 | - Invalid argument. |