| .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
| .. c:namespace:: DTV.fe |
| |
| .. _FE_READ_SIGNAL_STRENGTH: |
| |
| *********************** |
| FE_READ_SIGNAL_STRENGTH |
| *********************** |
| |
| Name |
| ==== |
| |
| FE_READ_SIGNAL_STRENGTH |
| |
| .. attention:: This ioctl is deprecated. |
| |
| Synopsis |
| ======== |
| |
| .. c:macro:: FE_READ_SIGNAL_STRENGTH |
| |
| ``int ioctl(int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)`` |
| |
| Arguments |
| ========= |
| |
| ``fd`` |
| File descriptor returned by :c:func:`open()`. |
| |
| ``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 is returned, and the ``errno`` variable is set |
| appropriately. |
| |
| Generic error codes are described at the |
| :ref:`Generic Error Codes <gen-errors>` chapter. |
