tcp套接字实验c代码

下面是用 C 语言编写的 TCP 套接字代码示例：

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

int main(int argc, char *argv[]) {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1) {
        perror("socket() failed");
        exit(EXIT_FAILURE);
    }

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

    if (connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("connect() failed");
        exit(EXIT_FAILURE);
    }

    char buffer[1024];
    strcpy(buffer, "Hello, server!");
    if (send(sockfd, buffer, strlen(buffer), 0) == -1) {
        perror("send() failed");
        exit(EXIT_FAILURE);
    }

    memset(buffer, 0, sizeof(buffer));
    if (recv(sockfd, buffer, sizeof(buffer), 0) == -1) {
        perror("recv() failed");
        exit(EXIT_FAILURE);
    }

    printf("Received message from server: %s\n", buffer);

    close(sockfd);
    return 0;
}

这个代码示例演示了如何使用 TCP 套接字连接到本地主机上的端口号为 8080 的服务器，并发送一个消息给服务器。服务器收到消息后，会发送一条回复消息给客户端，客户端收到回复消息后输出到控制台，并关闭连接。