| .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
| |
| .. _NET_GET_IF: |
| |
| **************** |
| ioctl NET_GET_IF |
| **************** |
| |
| Name |
| ==== |
| |
| NET_GET_IF - Read the configuration data of an interface created via - :ref:`NET_ADD_IF <net>`. |
| |
| |
| Synopsis |
| ======== |
| |
| .. c:function:: int ioctl( int fd, NET_GET_IF, struct dvb_net_if *net_if ) |
| :name: NET_GET_IF |
| |
| |
| Arguments |
| ========= |
| |
| ``fd`` |
| File descriptor returned by :ref:`open() <frontend_f_open>`. |
| |
| ``net_if`` |
| pointer to struct :c:type:`dvb_net_if` |
| |
| |
| Description |
| =========== |
| |
| The NET_GET_IF ioctl uses the interface number given by the struct |
| :c:type:`dvb_net_if`::ifnum field and fills the content of |
| struct :c:type:`dvb_net_if` with the packet ID and |
| encapsulation type used on such interface. If the interface was not |
| created yet with :ref:`NET_ADD_IF <net>`, it will return -1 and fill |
| the ``errno`` with ``EINVAL`` error code. |
| |
| |
| Return Value |
| ============ |
| |
| On success 0 is returned, and :c:type:`ca_slot_info` is filled. |
| |
| On error -1 is returned, and the ``errno`` variable is set |
| appropriately. |
| |
| The generic error codes are described at the |
| :ref:`Generic Error Codes <gen-errors>` chapter. |
