我试图了解bind()如何工作。 我打开一个套接字,并将其绑定到端口5001,但是我不对它执行listen():
sockfd = socket(AF_INET, SOCK_STREAM, 0);
/* Initialize socket structure */
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = 5001;
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
/* Now bind the host address using bind() call.*/
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
perror("ERROR on binding");
exit(1);
}
printf("bound to 5001");
getchar();
然后,该端口处于“使用中”状态:
$ nc -l 5001
nc: Address already in use
but when I try: netstat -ntpl
, lsof -i :5001
, sudo netstat -antp | grep 5001
none of them shows the 5001 port.
有没有办法查看绑定的端口以及拥有它们的进程? 或者,具有套接字描述符,显示套接字的端口/ ip /信息