.. -*- coding: utf-8; mode: rst -*- .. _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 ======== .. cpp:function:: int ioctl( int fd, int request, struct dvb_net_if *net_if ) Arguments ========= ``fd`` File descriptor returned by :ref:`open() `. ``request`` FE_SET_TONE ``net_if`` pointer to struct :ref:`dvb_net_if ` Description =========== The NET_GET_IF ioctl uses the interface number given by the struct :ref:`dvb_net_if `::ifnum field and fills the content of struct :ref:`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, on error -1 and the ``errno`` variable is set appropriately. The generic error codes are described at the :ref:`Generic Error Codes ` chapter.