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+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+.. c:namespace:: DTV.net
+
+.. _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:macro:: NET_GET_IF
+
+``int ioctl(int fd, NET_GET_IF, struct dvb_net_if *net_if)``
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :c:func:`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.