单线程阻塞

阻塞案例

阻塞案例，由于单线程，同一时间只有一个TCP链接能够被处理。

int main() {
    int serv_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);   //AF_INT:ipv4, SOCK_STREAM:tcp协议
    //将套接字和IP、端口绑定
    struct sockaddr_in *serv_addr = malloc(sizeof(struct sockaddr_in));
    serv_addr->sin_family = AF_INET;  //使用IPv4地址
    serv_addr->sin_addr.s_addr = inet_addr("127.0.0.1");  //具体的IP地址
    serv_addr->sin_port = htons(11234);  //端口
    int on = 1;
    if (setsockopt(serv_sock, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on)) == -1) {
        printf("处理失败SO_REUSEPORT失败");
        exit(1);
    }
    bind(serv_sock, (struct sockaddr *) serv_addr, sizeof(struct sockaddr));
    listen(serv_sock, 20);
    for (;;) {
        int fd = accept(serv_sock, NULL, NULL);
        char *hello = "hello chenshun!";
        char cc[20];
        ssize_t rr = read(fd, cc, 10);
        if (rr == -1) {
            close(fd);
        }
        printf("i receive your message:%s\n", cc);
        write(fd, hello, strlen(hello));
        write(fd, "good bye!", strlen("good bye!"));
        close(fd);
    }
    return 0;
}