写出基于tcp协议的服务端c语言编程

可以，您可以参考如下代码实现基于tcp协议的服务端C语言编程：

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

#define PORT 8080

int main(int argc, char const *argv[]) {
    int server_fd, client_fd, valread;
    struct sockaddr_in address;
    int addrlen = sizeof(address);
    char buffer[1024] = {0};
    char *hello = "Hello from server";

    // Creating socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    // Forcefully attaching socket to the port 8080
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    if ((client_fd = accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen)) < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }

    valread = read(client_fd, buffer, 1024);
    printf("%s\n", buffer);
    send(client_fd, hello, strlen(hello), 0);
    printf("Hello message sent\n");
    return 0;
}

该代码实现了一个简单的TCP协议的服务端。在该程序中，使用socket()函数创建了一个套接字，bind()绑定了一个端口号，listen()开始监听，并使用accept()函数等待客户端连接。当接收到客户端的连接请求时，程序通过read()函数读取客户端发送的数据并输出到屏幕上，然后通过send()函数向客户端发送“Hello from server”消息。