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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_tcp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_socket_delete PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function deletes a previously created socket and unbound */
/* socket. If the socket is still bound, an error is returned. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to TCP socket */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_tcp_socket_delete(NX_TCP_SOCKET *socket_ptr)
{
TX_INTERRUPT_SAVE_AREA
NX_IP *ip_ptr;
/* Setup the pointer to the associated IP instance. */
ip_ptr = socket_ptr -> nx_tcp_socket_ip_ptr;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_TCP_SOCKET_DELETE, ip_ptr, socket_ptr, socket_ptr -> nx_tcp_socket_state, 0, NX_TRACE_TCP_EVENTS, 0, 0);
/* Obtain the IP mutex so we can process the socket delete request. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Determine if the socket has been created. */
if (socket_ptr -> nx_tcp_socket_id != NX_TCP_ID)
{
/* Release the protection mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return a not created error code. */
return(NX_NOT_CREATED);
}
/* Determine if the socket is still bound to port. */
if ((socket_ptr -> nx_tcp_socket_bound_next) ||
(socket_ptr -> nx_tcp_socket_bind_in_progress) ||
(socket_ptr -> nx_tcp_socket_state != NX_TCP_CLOSED))
{
/* Release the protection mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return a still bound error code. */
return(NX_STILL_BOUND);
}
/* Disable interrupts. */
TX_DISABLE
/* Now, remove the TCP socket from the created socket list. */
/* Clear the socket ID to make it invalid. */
socket_ptr -> nx_tcp_socket_id = 0;
/* See if the socket is the only one on the list. */
if (socket_ptr == socket_ptr -> nx_tcp_socket_created_next)
{
/* Only created socket, just set the created list to NULL. */
ip_ptr -> nx_ip_tcp_created_sockets_ptr = NX_NULL;
}
else
{
/* Link-up the neighbors. */
(socket_ptr -> nx_tcp_socket_created_next) -> nx_tcp_socket_created_previous =
socket_ptr -> nx_tcp_socket_created_previous;
(socket_ptr -> nx_tcp_socket_created_previous) -> nx_tcp_socket_created_next =
socket_ptr -> nx_tcp_socket_created_next;
/* See if we have to update the created list head pointer. */
if (ip_ptr -> nx_ip_tcp_created_sockets_ptr == socket_ptr)
{
/* Yes, move the head pointer to the next link. */
ip_ptr -> nx_ip_tcp_created_sockets_ptr = socket_ptr -> nx_tcp_socket_created_next;
}
}
/* Decrease the created sockets count. */
ip_ptr -> nx_ip_tcp_created_sockets_count--;
/* Restore interrupts. */
TX_RESTORE
/* If trace is enabled, unregister this object. */
NX_TRACE_OBJECT_UNREGISTER(ip_ptr);
/* Release the IP protection mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return success. */
return(NX_SUCCESS);
}
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