C语言udp服务器端实现丢包率统计的代码

可以使用下面的代码实现丢包率统计：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define PORT 8888
#define MAXLINE 1024

int main() {
    int sockfd, n;
    struct sockaddr_in servaddr, cliaddr;
    socklen_t len;
    char mesg[MAXLINE];

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);

    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(PORT);

    bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
    
    int count = 0;
    int lost = 0;
    double loss_rate;

    for (;;) {
        len = sizeof(cliaddr);
        n = recvfrom(sockfd, mesg, MAXLINE, 0, (struct sockaddr *)&cliaddr, &len);

        if (n < 0) {
            perror("recvfrom error");
            exit(1);
        }

        count++;

        if (count % 10 == 0) {
            int r = rand();

            if (r % 2 == 0) {
                lost++;
                printf("Packet lost!\n");
            }
        }

        sendto(sockfd, mesg, n, 0, (struct sockaddr *)&cliaddr, len);

        if (count % 100 == 0) {
            loss_rate = (double)lost / count * 100;
            printf("Packet loss rate: %.2f%%\n", loss_rate);
        }
    }

    close(sockfd);

    return 0;
}

这段代码使用UDP套接字接收客户端的消息，并模拟丢包。每隔100个数据包统计一次丢包率。注意，在实际应用中，需要根据实际情况调整统计粒度。