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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 */
/** */
/** User Datagram Protocol (UDP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_udp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_udp_socket_bytes_available PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function determines the number of bytes available on a UDP */
/* socket for reception. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to the UDP sockete */
/* bytes_available Number of bytes returned to */
/* the caller. */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection */
/* tx_mutex_put Release protection */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_udp_socket_bytes_available(NX_UDP_SOCKET *socket_ptr, ULONG *bytes_available)
{
NX_IP *ip_ptr;
NX_PACKET *packet_ptr;
INT count;
/* Setup IP pointer. */
ip_ptr = socket_ptr -> nx_udp_socket_ip_ptr;
/* Obtain the IP mutex so we can examine the bound port. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
*bytes_available = 0;
/* Determine if the socket is currently bound. */
if (!socket_ptr -> nx_udp_socket_bound_next)
{
/* Release mutex */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_NOT_SUCCESSFUL);
}
packet_ptr = socket_ptr -> nx_udp_socket_receive_head;
/* Loop through all the packets on the queue and find out the total
number of bytes in the rx queue that are available to the applciation. */
for (count = 0; count < (INT)(socket_ptr -> nx_udp_socket_receive_count); count++)
{
*bytes_available += (packet_ptr -> nx_packet_length - (ULONG)sizeof(NX_UDP_HEADER));
/* Move on to the next packet. */
packet_ptr = packet_ptr -> nx_packet_queue_next;
}
/* Release protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_SUCCESS);
}
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