Bind返回正在使用的地址，即使没有建立连接

我有一个c++代码，我试图在套接字上建立连接。但我首先需要检查给定端口上是否已经存在连接，如果存在，我需要关闭连接。我有下面的代码，我的问题是，当检查端口是否已经连接时，它返回即使连接之前失败。

connected = false;
int sockfd;
void conn(int port) {
   struct sockaddr_in addr;
   addr.sin_family = AF_INET;
   addr.sin_port   = htons(port);
   .....
   int sockfd_t;
   if ( (sockfd_t = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
       cout << "Error opening socket_test " << endl;
       return;
   }
   // check if address already in use
   if (bind(sockfd_t, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
        if(errno == EADDRINUSE) {
        cout << "address in use: bind fail, port=" << port << endl;
    }
        // do something - close the connection if already connected
    }
    else {
        cout << "bind ok, port=" << port << endl;
    }
    close(sockfd_t);
    if ( (sockfd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
       cout << "Error opening socket " << endl;
       return;
    }
    if (connect(sockfd, (struct sockaddr *) &adresse, sizeof(adresse))) {
        cout << "Error connecting" << endl;
        close(sockfd);
        return;
    }
    connected = true;
}
int main() {
    int port=3590;
    while (!connected) {
       conn(port);
    }
    cout << "CONNECTED";
    // ..........
}

程序运行后输出如下:

bind ok, port=3590;
Error connecting
bind ok, port=3590;
Error connecting
address in use: bind fail, port=3590 //???
CONNECTED!

我不知道为什么在打印的第5行它显示"地址在使用:…"作为连接失败的前两次?