linux tcp mss设置

echo 1400 > /proc/sys/net/ipv4/tcp_mtu_probing

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

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

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

    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(8080);
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    int mss = 1400;
    setsockopt(sockfd, IPPROTO_TCP, TCP_MAXSEG, &mss, sizeof(mss));

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

    // 进行数据传输

    close(sockfd);
    return 0;
}