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Resync new repository with old repo r5166
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
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/****************************************************************************
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* net/net_monitor.c
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*
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* Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* 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_TCP)
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#include <stdint.h>
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#include <assert.h>
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#include <debug.h>
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#include "net_internal.h"
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#include "uip/uip_internal.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static void connection_event(struct uip_conn *conn, uint16_t flags);
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: connection_event
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*
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* Description:
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* Some connection related event has occurred
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*
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* Parameters:
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* dev The sructure of the network driver that caused the interrupt
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* conn The connection structure associated with the socket
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* flags Set of events describing why the callback was invoked
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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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* Running at the interrupt level
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*
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****************************************************************************/
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static void connection_event(struct uip_conn *conn, uint16_t flags)
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{
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FAR struct socket *psock = (FAR struct socket *)conn->connection_private;
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if (psock)
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{
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nllvdbg("flags: %04x s_flags: %02x\n", flags, psock->s_flags);
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/* These loss-of-connection events may be reported:
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*
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* UIP_CLOSE: The remote host has closed the connection
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* UIP_ABORT: The remote host has aborted the connection
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* UIP_TIMEDOUT: Connection aborted due to too many retransmissions.
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*
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* And we need to set these two socket status bits appropriately:
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*
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* _SF_CONNECTED==1 && _SF_CLOSED==0 - the socket is connected
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* _SF_CONNECTED==0 && _SF_CLOSED==1 - the socket was gracefully disconnected
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* _SF_CONNECTED==0 && _SF_CLOSED==0 - the socket was rudely disconnected
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*/
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if ((flags & UIP_CLOSE) != 0)
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{
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/* The peer gracefully closed the connection. Marking the
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* connection as disconnected will suppress some subsequent
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* ENOTCONN errors from receive. A graceful disconnection is
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* not handle as an error but as an "end-of-file"
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*/
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psock->s_flags &= ~_SF_CONNECTED;
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psock->s_flags |= _SF_CLOSED;
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}
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else if ((flags & (UIP_ABORT|UIP_TIMEDOUT)) != 0)
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{
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/* The loss of connection was less than graceful. This will (eventually)
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* be reported as an ENOTCONN error.
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*/
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psock->s_flags &= ~(_SF_CONNECTED |_SF_CLOSED);
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}
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/* UIP_CONNECTED: The socket is successfully connected */
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else if ((flags & UIP_CONNECTED) != 0)
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{
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/* Indicate that the socket is now connected */
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psock->s_flags |= _SF_CONNECTED;
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psock->s_flags &= ~_SF_CLOSED;
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}
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_startmonitor
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*
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* Description:
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* Set up to receive TCP connection state changes for a given socket
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*
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* Input Parameters:
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* psock - The socket of interest
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*
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* Returned Value:
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* For now, this function always returns OK.
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*
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****************************************************************************/
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int net_startmonitor(FAR struct socket *psock)
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{
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FAR struct uip_conn *conn = psock->s_conn;
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DEBUGASSERT(psock && conn);
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/* Set up to receive callbacks on connection-related events */
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conn->connection_private = (void*)psock;
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conn->connection_event = connection_event;
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return OK;
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}
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/****************************************************************************
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* Name: net_stopmonitor
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*
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* Description:
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* Stop monitoring TCP connection changes for a given socket
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*
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* Input Parameters:
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* conn - The TCP connection of interest
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void net_stopmonitor(FAR struct uip_conn *conn)
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{
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DEBUGASSERT(conn);
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conn->connection_private = NULL;
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conn->connection_event = NULL;
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}
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#endif /* CONFIG_NET && CONFIG_NET_TCP */
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