1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2.. c:namespace:: DTV.net 3 4.. _NET_GET_IF: 5 6**************** 7ioctl NET_GET_IF 8**************** 9 10Name 11==== 12 13NET_GET_IF - Read the configuration data of an interface created via - :ref:`NET_ADD_IF <net>`. 14 15Synopsis 16======== 17 18.. c:macro:: NET_GET_IF 19 20``int ioctl(int fd, NET_GET_IF, struct dvb_net_if *net_if)`` 21 22Arguments 23========= 24 25``fd`` 26 File descriptor returned by :c:func:`open()`. 27 28``net_if`` 29 pointer to struct :c:type:`dvb_net_if` 30 31Description 32=========== 33 34The NET_GET_IF ioctl uses the interface number given by the struct 35:c:type:`dvb_net_if`::ifnum field and fills the content of 36struct :c:type:`dvb_net_if` with the packet ID and 37encapsulation type used on such interface. If the interface was not 38created yet with :ref:`NET_ADD_IF <net>`, it will return -1 and fill 39the ``errno`` with ``EINVAL`` error code. 40 41Return Value 42============ 43 44On success 0 is returned, and :c:type:`ca_slot_info` is filled. 45 46On error -1 is returned, and the ``errno`` variable is set 47appropriately. 48 49The generic error codes are described at the 50:ref:`Generic Error Codes <gen-errors>` chapter. 51