75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
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/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <errno.h>
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#include <gpxe/xfer.h>
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/** @file
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*
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* Data transfer interfaces
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*
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*/
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/**
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* Deliver datagram
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*
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* @v xfer Data-transfer interface
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* @v iobuf Datagram I/O buffer
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* @ret rc Return status code
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*/
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int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf ) {
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struct xfer_interface *dest = xfer_dest ( xfer );
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return dest->op->deliver ( dest, xfer, iobuf );
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}
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/**
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* Null deliver datagram
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*
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* @v xfer Data-transfer interface
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* @v src Source interface
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* @v iobuf Datagram I/O buffer
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* @ret rc Return status code
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*/
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static int null_deliver ( struct xfer_interface *xfer __unused,
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struct xfer_interface *src __unused,
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struct io_buffer *iobuf ) {
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free_iob ( iobuf );
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return -EPIPE;
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}
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/** Null data transfer interface operations */
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struct xfer_interface_operations null_xfer_ops = {
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.deliver = null_deliver,
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};
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/**
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* Null data transfer interface
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*
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* This is the interface to which data transfer interfaces are
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* connected when unplugged. It will never generate messages, and
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* will silently absorb all received messages.
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*/
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struct xfer_interface null_xfer = {
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.intf = {
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.dest = &null_xfer.intf,
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.refcnt = null_refcnt,
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},
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.op = &null_xfer_ops,
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};
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