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git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4412 7fd9a85b-ad96-42d3-883c-3090e2eb8679sbg
patacongo
13 years ago
6 changed files with 231 additions and 103 deletions
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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 <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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