118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
/****************************************************************************
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* net/udp/udp_devpoll.c
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* Network device poll for the availability of UDP TX data
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*
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* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Adapted for NuttX from logic in uIP which also has a BSD-like license:
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*
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* Original author Adam Dunkels <adam@dunkels.com>
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* Copyright () 2001-2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP)
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/udp.h>
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#include "devif/devif.h"
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#include "udp/udp.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: udp_poll
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*
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* Description:
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* Poll a UDP "connection" structure for availability of TX data
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The UDP "connection" to poll for TX data
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked.
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* dev is not NULL.
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* conn is not NULL.
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* The connection (conn) is bound to the polling device (dev) in case of
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* enabled CONFIG_NET_UDP_WRITE_BUFFERS option.
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*
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****************************************************************************/
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void udp_poll(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn)
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{
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DEBUGASSERT(dev != NULL && conn != NULL);
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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DEBUGASSERT(dev == conn->dev);
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#endif
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/* Verify that the UDP connection is valid */
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if (conn->lport != 0)
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{
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dev->d_len = 0;
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dev->d_sndlen = 0;
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/* Perform the application callback */
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udp_callback(dev, conn, UDP_POLL);
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/* If the application has data to send, setup the UDP/IP header */
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if (dev->d_sndlen > 0)
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{
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udp_send(dev, conn);
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return;
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}
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}
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/* Make sure that d_len is zero meaning that there is nothing to be sent */
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dev->d_len = 0;
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}
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#endif /* CONFIG_NET && CONFIG_NET_UDP */
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