| .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
| .. c:namespace:: DTV.fe |
| |
| .. _FE_GET_INFO: |
| |
| ***************** |
| ioctl FE_GET_INFO |
| ***************** |
| |
| Name |
| ==== |
| |
| FE_GET_INFO - Query Digital TV frontend capabilities and returns information |
| about the - front-end. This call only requires read-only access to the device. |
| |
| Synopsis |
| ======== |
| |
| .. c:macro:: FE_GET_INFO |
| |
| ``int ioctl(int fd, FE_GET_INFO, struct dvb_frontend_info *argp)`` |
| |
| Arguments |
| ========= |
| |
| ``fd`` |
| File descriptor returned by :c:func:`open()`. |
| |
| ``argp`` |
| pointer to struct :c:type:`dvb_frontend_info` |
| |
| Description |
| =========== |
| |
| All Digital TV frontend devices support the :ref:`FE_GET_INFO` ioctl. It is |
| used to identify kernel devices compatible with this specification and to |
| obtain information about driver and hardware capabilities. The ioctl |
| takes a pointer to dvb_frontend_info which is filled by the driver. |
| When the driver is not compatible with this specification the ioctl |
| returns an error. |
| |
| frontend capabilities |
| ===================== |
| |
| Capabilities describe what a frontend can do. Some capabilities are |
| supported only on some specific frontend types. |
| |
| The frontend capabilities are described at :c:type:`fe_caps`. |
| |
| 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. |
