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1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later2.. c:namespace:: DTV.net3 4.. _NET_GET_IF:5 6****************7ioctl NET_GET_IF8****************9 10Name11====12 13NET_GET_IF - Read the configuration data of an interface created via - :ref:`NET_ADD_IF <net>`.14 15Synopsis16========17 18.. c:macro:: NET_GET_IF19 20``int ioctl(int fd, NET_GET_IF, struct dvb_net_if *net_if)``21 22Arguments23=========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 31Description32===========33 34The NET_GET_IF ioctl uses the interface number given by the struct35:c:type:`dvb_net_if`::ifnum field and fills the content of36struct :c:type:`dvb_net_if` with the packet ID and37encapsulation type used on such interface. If the interface was not38created yet with :ref:`NET_ADD_IF <net>`, it will return -1 and fill39the ``errno`` with ``EINVAL`` error code.40 41Return Value42============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 set47appropriately.48 49The generic error codes are described at the50:ref:`Generic Error Codes <gen-errors>` chapter.51