在udp服务器-C中接收最新数据包

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define BUF_SIZE 1024

int main() {
    int sockfd;
    struct sockaddr_in serv_addr, clnt_addr;
    socklen_t clnt_addr_len;
    char buffer[BUF_SIZE];

    // 创建UDP套接字
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd == -1) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    // 绑定地址
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(12345);
    if (bind(sockfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1) {
        perror("bind");
        exit(EXIT_FAILURE);
    }

    while (1) {
        // 接收数据包
        clnt_addr_len = sizeof(clnt_addr);
        ssize_t recv_len = recvfrom(sockfd, buffer, BUF_SIZE, 0, (struct sockaddr*)&clnt_addr, &clnt_addr_len);
        if (recv_len == -1) {
            perror("recvfrom");
            exit(EXIT_FAILURE);
        }

        // 处理数据包
        printf("Received packet from %s:%d\n", inet_ntoa(clnt_addr.sin_addr), ntohs(clnt_addr.sin_port));
        printf("Data: %s\n", buffer);
    }

    close(sockfd);
    return 0;
}