套接字绑定失败errno = 99

我试图绑定服务器套接字，所以我可以接收和侦听来自其他客户端的传入消息。 但我不能绑定，它会返回一个错误 – 套接字绑定失败：99.我读了这是什么意思，它说errno 99表明该套接字不存在？ 有任何想法吗？ 谢谢

UDP_socketID = socket(AF_INET, SOCK_DGRAM, 0); if (UDP_socketID < 0) { printf("Socket creation failed! Error = %d\n\n", errno); exit(0); } //specify server address, port and IP bzero((char *)&serverAddr, sizeof(serverAddr)); serverAddr.sin_family = AF_INET; serverAddr.sin_addr.s_addr = htonl(INADDR_ANY); serverAddr.sin_port = htons(SERV_PORT); check = inet_aton(SERVER_IP, &serverAddr.sin_addr); if (check == 0) printf("IP conversion error!\n\n"); start = bind(UDP_socketID, (struct sockaddr *) &serverAddr, sizeof(serverAddr)); if (start < 0) { printf("Socket bind failed = %d\n", errno); exit(0); } else printf("Socket bind successful!\n");