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