在C中使用UDP发送数据包并测量运行时间

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

int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
    perror("Failed to create socket");
    exit(EXIT_FAILURE);
}

struct sockaddr_in serverAddr;
memset(&serverAddr, 0, sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(12345);  // 设置目标端口号
serverAddr.sin_addr.s_addr = inet_addr("目标服务器IP地址");  // 设置目标IP地址

char* sendData = "Hello, UDP!";  // 要发送的数据
int sendLen = strlen(sendData);

struct timeval start, end;
gettimeofday(&start, NULL);  // 记录发送开始时间
int sendBytes = sendto(sockfd, sendData, sendLen, 0, (struct sockaddr*)&serverAddr, sizeof(serverAddr));
if (sendBytes < 0) {
    perror("Failed to send data");
    exit(EXIT_FAILURE);
}

char recvData[1024];
struct sockaddr_in clientAddr;
socklen_t clientAddrLen = sizeof(clientAddr);
int recvBytes = recvfrom(sockfd, recvData, sizeof(recvData), 0, (struct sockaddr*)&clientAddr, &clientAddrLen);
if (recvBytes < 0) {
    perror("Failed to receive data");
    exit(EXIT_FAILURE);
}

gettimeofday(&end, NULL);  // 记录发送结束时间
double elapsedTime = (end.tv_sec - start.tv_sec) * 1000.0;  // 计算发送时间（毫秒）
elapsedTime += (end.tv_usec - start.tv_usec) / 1000.0;
printf("发送数据包耗时：%.2f毫秒\n", elapsedTime);