.. 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 `. 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 `, 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 ` chapter.