linux tcp 超时重传

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

int main() {
    int sockfd;
    struct sockaddr_in servaddr;

    // 创建socket
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

    memset(&servaddr, 0, sizeof(servaddr));

    // 配置服务器地址
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(8080);
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    // 连接服务器
    if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
        perror("connection with the server failed");
        exit(EXIT_FAILURE);
    }

    // 设置TCP超时重传参数
    int timeout = 5; // 5秒超时
    setsockopt(sockfd, IPPROTO_TCP, TCP_USER_TIMEOUT, &timeout, sizeof(timeout));

    // 发送数据
    char *message = "Hello Server";
    send(sockfd, message, strlen(message), 0);

    // 接收响应
    char buffer[1024] = {0};
    read(sockfd, buffer, 1024);
    printf("Response from server: %s\n", buffer);

    close(sockfd);
    return 0;
}