linux下tcp socket编程实例

下面是一个简单的 Linux 下 TCP Socket 编程实例：

1. 创建 Socket

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

2. 绑定 Socket

struct sockaddr_in addr;
memset(&addr, , sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);

if (bind(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < ) {
    perror("bind");
    exit(EXIT_FAILURE);
}

3. 监听 Socket

if (listen(sockfd, backlog) < ) {
    perror("listen");
    exit(EXIT_FAILURE);
}

4. 接受连接

struct sockaddr_in client_addr;
socklen_t client_len = sizeof(client_addr);
int clientfd = accept(sockfd, (struct sockaddr *)&client_addr, &client_len);
if (clientfd < ) {
    perror("accept");
    exit(EXIT_FAILURE);
}

5. 发送数据

char *msg = "Hello, world!";
if (send(clientfd, msg, strlen(msg), ) < ) {
    perror("send");
    exit(EXIT_FAILURE);
}

6. 接收数据

char buf[1024];
int n = recv(clientfd, buf, sizeof(buf), );
if (n < ) {
    perror("recv");
    exit(EXIT_FAILURE);
} else if (n == ) {
    printf("Connection closed by peer.\n");
} else {
    buf[n] = '\';
    printf("Received: %s\n", buf);
}

7. 关闭 Socket

close(clientfd);
close(sockfd);