projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
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1 | .. -*- coding: utf-8; mode: rst -*- |
| 2 | ||
| 3 | .. _FE_READ_SIGNAL_STRENGTH: | |
| 4 | ||
| 5 | *********************** | |
| 6 | FE_READ_SIGNAL_STRENGTH | |
| 7 | *********************** | |
| 8 | ||
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9 | NAME |
| 10 | ==== | |
| 5377d91f | 11 | |
| 586027ce | 12 | FE_READ_SIGNAL_STRENGTH |
| 5377d91f | 13 | |
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14 | SYNOPSIS |
| 15 | ======== | |
| 5377d91f | 16 | |
| 5d468e2b | 17 | .. c:function:: int ioctl( int fd, int request = FE_READ_SIGNAL_STRENGTH, uint16_t *strength) |
| 5377d91f | 18 | |
| 5377d91f | 19 | |
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20 | ARGUMENTS |
| 21 | ========= | |
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22 | |
| 23 | .. flat-table:: | |
| 24 | :header-rows: 0 | |
| 25 | :stub-columns: 0 | |
| 26 | ||
| 27 | ||
| 28 | - .. row 1 | |
| 29 | ||
| 30 | - int fd | |
| 31 | ||
| 32 | - File descriptor returned by a previous call to open(). | |
| 33 | ||
| 34 | - .. row 2 | |
| 35 | ||
| 36 | - int request | |
| 37 | ||
| 38 | - Equals | |
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39 | :ref:`FE_READ_SIGNAL_STRENGTH` |
| 40 | for this command. | |
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41 | |
| 42 | - .. row 3 | |
| 43 | ||
| 5d468e2b | 44 | - uint16_t \*strength |
| 5377d91f | 45 | |
| 5d468e2b | 46 | - The signal strength value is stored into \*strength. |
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47 | |
| 48 | ||
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49 | DESCRIPTION |
| 50 | =========== | |
| 51 | ||
| 52 | This ioctl call returns the signal strength value for the signal | |
| 53 | currently received by the front-end. For this command, read-only access | |
| 54 | to the device is sufficient. | |
| 55 | ||
| 56 | ||
| 57 | RETURN VALUE | |
| 58 | ============ | |
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59 | |
| 60 | On success 0 is returned, on error -1 and the ``errno`` variable is set | |
| 61 | appropriately. The generic error codes are described at the | |
| 62 | :ref:`Generic Error Codes <gen-errors>` chapter. |