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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** User Datagram Protocol (UDP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_udp.h"
#include "tx_thread.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_udp_socket_delete PORTABLE C */
/* 6.1 */
/* 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 UDP socket */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* _tx_thread_system_preempt_check Check for preemption */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nx_udp_socket_delete(NX_UDP_SOCKET *socket_ptr)
{
TX_INTERRUPT_SAVE_AREA
NX_IP *ip_ptr;
/* Setup the pointer to the associated IP instance. */
ip_ptr = socket_ptr -> nx_udp_socket_ip_ptr;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_UDP_SOCKET_DELETE, ip_ptr, socket_ptr, 0, 0, NX_TRACE_UDP_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 is still bound to port. */
if (socket_ptr -> nx_udp_socket_bound_next)
{
/* 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 UDP socket from the created socket list. */
/* Clear the socket ID to make it invalid. */
socket_ptr -> nx_udp_socket_id = 0;
/* See if the socket is the only one on the list. */
if (socket_ptr == socket_ptr -> nx_udp_socket_created_next)
{
/* Only created socket, just set the created list to NULL. */
ip_ptr -> nx_ip_udp_created_sockets_ptr = NX_NULL;
}
else
{
/* Link-up the neighbors. */
(socket_ptr -> nx_udp_socket_created_next) -> nx_udp_socket_created_previous =
socket_ptr -> nx_udp_socket_created_previous;
(socket_ptr -> nx_udp_socket_created_previous) -> nx_udp_socket_created_next =
socket_ptr -> nx_udp_socket_created_next;
/* See if we have to update the created list head pointer. */
if (ip_ptr -> nx_ip_udp_created_sockets_ptr == socket_ptr)
{
/* Yes, move the head pointer to the next link. */
ip_ptr -> nx_ip_udp_created_sockets_ptr = socket_ptr -> nx_udp_socket_created_next;
}
}
/* Decrease the created sockets count. */
ip_ptr -> nx_ip_udp_created_sockets_count--;
/* Restore interrupts. */
TX_RESTORE
/* If trace is enabled, unregister this object. */
NX_TRACE_OBJECT_UNREGISTER(socket_ptr);
/* Release the IP protection mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Check for preemption. */
_tx_thread_system_preempt_check();
/* Return success. */
return(NX_SUCCESS);
}