int sockfd; fd_set fdR; struct timeval timeout = ..; ... for(;;) { FD_ZERO(&fdR); FD_SET(sockfd, &fdR); switch (select(sockfd + 1, &fdR, NULL, &timeout)) { case -1: error handled by u; case 0: timeout hanled by u; default: if (FD_ISSET(sockfd)) { now u read or recv something; /* if sockfd is father and server socket, u can now accept() */ } } }
请问，default的时候，如果我有sockfd1，sockfd2两个套接字。我是如何知道究竟哪个就绪？轮询吗？ if (FD_ISSET(sockfd1){......} else if (FD_ISSET(sockfd2){....} C/C++ code: int sockfd; fd_set fdR; struct timeval timeout = ..; ... for(;;) { FD_ZERO(&fdR); F
