projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 5377d91f MH |
1 | .. -*- coding: utf-8; mode: rst -*- |
| 2 | ||
| 3 | .. _FE_READ_SIGNAL_STRENGTH: | |
| 4 | ||
| 5 | *********************** | |
| 6 | FE_READ_SIGNAL_STRENGTH | |
| 7 | *********************** | |
| 8 | ||
| 15e7d615 | 9 | Name |
| 586027ce | 10 | ==== |
| 5377d91f | 11 | |
| 586027ce | 12 | FE_READ_SIGNAL_STRENGTH |
| 5377d91f | 13 | |
| cf8076c3 | 14 | .. attention:: This ioctl is deprecated. |
| 15e7d615 MCC |
15 | |
| 16 | Synopsis | |
| 586027ce | 17 | ======== |
| 5377d91f | 18 | |
| cf8076c3 MCC |
19 | .. c:function:: int ioctl( int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength) |
| 20 | :name: FE_READ_SIGNAL_STRENGTH | |
| 5377d91f | 21 | |
| 5377d91f | 22 | |
| 15e7d615 | 23 | Arguments |
| 586027ce | 24 | ========= |
| 5377d91f | 25 | |
| cf8076c3 MCC |
26 | ``fd`` |
| 27 | File descriptor returned by :c:func:`open() <dvb-fe-open>`. | |
| 5377d91f | 28 | |
| cf8076c3 MCC |
29 | ``strength`` |
| 30 | The signal strength value is stored into \*strength. | |
| 5377d91f MH |
31 | |
| 32 | ||
| 15e7d615 | 33 | Description |
| 586027ce MCC |
34 | =========== |
| 35 | ||
| 36 | This ioctl call returns the signal strength value for the signal | |
| 37 | currently received by the front-end. For this command, read-only access | |
| 38 | to the device is sufficient. | |
| 39 | ||
| 40 | ||
| 15e7d615 | 41 | Return Value |
| 586027ce | 42 | ============ |
| 5377d91f MH |
43 | |
| 44 | On success 0 is returned, on error -1 and the ``errno`` variable is set | |
| 45 | appropriately. The generic error codes are described at the | |
| 46 | :ref:`Generic Error Codes <gen-errors>` chapter. |