| .. -*- coding: utf-8; mode: rst -*- |
| |
| .. _FE_READ_SIGNAL_STRENGTH: |
| |
| *********************** |
| FE_READ_SIGNAL_STRENGTH |
| *********************** |
| |
| NAME |
| ==== |
| |
| FE_READ_SIGNAL_STRENGTH |
| |
| SYNOPSIS |
| ======== |
| |
| .. c:function:: int ioctl( int fd, int request = FE_READ_SIGNAL_STRENGTH, uint16_t *strength) |
| |
| |
| ARGUMENTS |
| ========= |
| |
| .. flat-table:: |
| :header-rows: 0 |
| :stub-columns: 0 |
| |
| |
| - .. row 1 |
| |
| - int fd |
| |
| - File descriptor returned by a previous call to open(). |
| |
| - .. row 2 |
| |
| - int request |
| |
| - Equals |
| :ref:`FE_READ_SIGNAL_STRENGTH` |
| for this command. |
| |
| - .. row 3 |
| |
| - uint16_t \*strength |
| |
| - The signal strength value is stored into \*strength. |
| |
| |
| DESCRIPTION |
| =========== |
| |
| This ioctl call returns the signal strength value for the signal |
| currently received by the front-end. For this command, read-only access |
| to the device is sufficient. |
| |
| |
| RETURN VALUE |
| ============ |
| |
| On success 0 is returned, on error -1 and the ``errno`` variable is set |
| appropriately. The generic error codes are described at the |
| :ref:`Generic Error Codes <gen-errors>` chapter. |