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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Transmission Control Protocol (TCP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ip.h"
#include "nx_tcp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_socket_state_fin_wait2 PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes packets during the FIN WAIT 2 state, */
/* which is the state after the initial FIN was issued and the other */
/* side of the connection issued an ACK. If a FIN is received in */
/* this state, an ACK is sent back the disconnection is complete. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to owning socket */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_tcp_packet_send_ack Send ACK message */
/* */
/* CALLED BY */
/* */
/* _nx_tcp_socket_packet_process Process TCP packet for socket */
/* */
/**************************************************************************/
VOID _nx_tcp_socket_state_fin_wait2(NX_TCP_SOCKET *socket_ptr)
{
/* Determine if a FIN has been previously detected in the _nx_tcp_socket_state_data_check
routine and if the socket's sequence number matches the expected FIN sequence number. */
if ((socket_ptr -> nx_tcp_socket_fin_received) &&
(socket_ptr -> nx_tcp_socket_fin_sequence == socket_ptr -> nx_tcp_socket_rx_sequence))
{
/* Return to the proper socket state. */
/* Yes, return the socket to the TIMED WAIT state. */
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_TCP_STATE_CHANGE, socket_ptr -> nx_tcp_socket_ip_ptr, socket_ptr, socket_ptr -> nx_tcp_socket_state, NX_TCP_TIMED_WAIT, NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* Set the socket state to TIMED WAIT now. */
socket_ptr -> nx_tcp_socket_state = NX_TCP_TIMED_WAIT;
/* Set the timeout as 2MSL (Maximum Segment Lifetime). */
socket_ptr -> nx_tcp_socket_timeout = _nx_tcp_2MSL_timer_rate;
/* Send ACK back to the other side of the connection. */
/* Increment the received sequence number. */
socket_ptr -> nx_tcp_socket_rx_sequence++;
/* Send ACK message. */
_nx_tcp_packet_send_ack(socket_ptr, socket_ptr -> nx_tcp_socket_tx_sequence);
/* Determine if we need to wake a thread suspended on the connection. */
if (socket_ptr -> nx_tcp_socket_disconnect_suspended_thread)
{
/* Resume the thread suspended for the disconnect. */
_nx_tcp_socket_thread_resume(&(socket_ptr -> nx_tcp_socket_disconnect_suspended_thread), NX_SUCCESS);
}
/* If given, call the application's disconnect callback function
for disconnect. */
if (socket_ptr -> nx_tcp_disconnect_callback)
{
/* Call the application's disconnect handling function. It is
responsible for calling the socket disconnect function. */
(socket_ptr -> nx_tcp_disconnect_callback)(socket_ptr);
}
#ifndef NX_DISABLE_EXTENDED_NOTIFY_SUPPORT
/* Is a timed wait callback registered for this socket? */
if (socket_ptr -> nx_tcp_timed_wait_callback)
{
/* Call the timed wait callback for this socket to let the host
know the socket can now be put in the timed wait state (if
the RE-USE ADDRESS socket option is not enabled). */
(socket_ptr -> nx_tcp_timed_wait_callback)(socket_ptr);
}
/* Is a disconnect complete callback registered with the TCP socket? */
if (socket_ptr -> nx_tcp_disconnect_complete_notify)
{
/* Call the application's disconnect_complete callback function. */
(socket_ptr -> nx_tcp_disconnect_complete_notify)(socket_ptr);
}
#endif
}
}
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