1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2 3.. _NET_GET_IF: 4 5**************** 6ioctl NET_GET_IF 7**************** 8 9Name 10==== 11 12NET_GET_IF - Read the configuration data of an interface created via - :ref:`NET_ADD_IF <net>`. 13 14 15Synopsis 16======== 17 18.. c:function:: int ioctl( int fd, NET_GET_IF, struct dvb_net_if *net_if ) 19 :name: NET_GET_IF 20 21 22Arguments 23========= 24 25``fd`` 26 File descriptor returned by :ref:`open() <frontend_f_open>`. 27 28``net_if`` 29 pointer to struct :c:type:`dvb_net_if` 30 31 32Description 33=========== 34 35The NET_GET_IF ioctl uses the interface number given by the struct 36:c:type:`dvb_net_if`::ifnum field and fills the content of 37struct :c:type:`dvb_net_if` with the packet ID and 38encapsulation type used on such interface. If the interface was not 39created yet with :ref:`NET_ADD_IF <net>`, it will return -1 and fill 40the ``errno`` with ``EINVAL`` error code. 41 42 43Return Value 44============ 45 46On success 0 is returned, and :c:type:`ca_slot_info` is filled. 47 48On error -1 is returned, and the ``errno`` variable is set 49appropriately. 50 51The generic error codes are described at the 52:ref:`Generic Error Codes <gen-errors>` chapter. 53