编写一个C语言server端支持自定义的监听端口，client发送测试流并成功返回信息的代码

下面是一个使用C语言编写的server端支持自定义的监听端口，client发送测试流并成功返回信息的代码：

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

#define PORT 8080
#define BUFFER_SIZE 1024

int main() {
    int server_socket, client_socket, addr_len;
    char buffer[BUFFER_SIZE];
    struct sockaddr_in server_addr, client_addr;

    // 创建socket
    server_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (server_socket == -1) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

    // 初始化服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(PORT);

    // 绑定socket
    if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // 监听socket
    if (listen(server_socket, 3) < 0) {
        perror("listen failed");
        exit(EXIT_FAILURE);
    }

    printf("server is listening on port %d\n", PORT);

    addr_len = sizeof(client_addr);
    // 接收client连接并处理请求
    while (1) {
        client_socket = accept(server_socket, (struct sockaddr*)&client_addr, (socklen_t*)&addr_len);
        if (client_socket < 0) {
            perror("accept failed");
            exit(EXIT_FAILURE);
        }

        // 读取client发送的测试流
        while (read(client_socket, buffer, BUFFER_SIZE) > 0) {
            printf("received message from client: %s\n", buffer);

            // 发送成功返回消息
            char msg[] = "success";
            if (write(client_socket, msg, strlen(msg)) < 0) {
                perror("write failed");
                exit(EXIT_FAILURE);
            }
        }

        close(client_socket);
    }

    close(server_socket);
    return 0;
}

希望这个代码对你有帮助。