| .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
| |
| .. _FE_READ_STATUS: |
| |
| ******************** |
| ioctl FE_READ_STATUS |
| ******************** |
| |
| Name |
| ==== |
| |
| FE_READ_STATUS - Returns status information about the front-end. This call only requires - read-only access to the device |
| |
| |
| Synopsis |
| ======== |
| |
| .. c:function:: int ioctl( int fd, FE_READ_STATUS, unsigned int *status ) |
| :name: FE_READ_STATUS |
| |
| |
| Arguments |
| ========= |
| |
| ``fd`` |
| File descriptor returned by :ref:`open() <frontend_f_open>`. |
| |
| ``status`` |
| pointer to a bitmask integer filled with the values defined by enum |
| :c:type:`fe_status`. |
| |
| |
| Description |
| =========== |
| |
| All Digital TV frontend devices support the ``FE_READ_STATUS`` ioctl. It is |
| used to check about the locking status of the frontend after being |
| tuned. The ioctl takes a pointer to an integer where the status will be |
| written. |
| |
| .. note:: |
| |
| The size of status is actually sizeof(enum fe_status), with |
| varies according with the architecture. This needs to be fixed in the |
| future. |
| |
| |
| int fe_status |
| ============= |
| |
| The fe_status parameter is used to indicate the current state and/or |
| state changes of the frontend hardware. It is produced using the enum |
| :c:type:`fe_status` values on a bitmask |
| |
| |
| 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. |
