用法:FD_ZERO(fd_set*); 用来清空fd_set集合,即让fd_set集合不再包含任何文件句柄。 FD_SET 用法:FD_SET(int ,fd_set *); 用来将一个给定的文件描述符加入集合之中 FD_CLR 用法:FD_CLR(int ,fd_set*); 用来将一个给定的文件描述符从集合中删除 FD_ISSET 用法:FD_ISSET(int ,fd_set*); 检测fd...
FD_ZERO(fd_set *fdset)将指定的文件描述符集清空,在对文件描述符集合进行设置前,必须对其进行初始化,如果不清空,由于在系统分配内存空间后,通常并不作清空处理,所以结果是不可知的。 FD_SET(fd_set *fdset)用于在文件描述符集合中增加一个新的文件描述符。 FD_CLR(fd_set *fdset)用于在文件描述符集合中...
setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));多路io转接模型select多路io转接:原理:借助内核,select来监听,客户端连接和数据通信事件void FD_ZERO(fd_set *set): ---清空一个文件描述符集合fd_set rset;FD_ZERO(&rset);void FD_SET(int fd,fd_set *set): ---将待监听的...
fd_set read_fds;intmax_fd;while(1) { FD_ZERO(&read_fds); FD_SET(server_socket, &read_fds); max_fd = server_socket;for(inti =0; i < MAX_CLIENTS; i++) {if(client_sockets[i] >0) { FD_SET(client_sockets[i], &read_fds);if(client_sockets[i] > max_fd) { max_fd = cl...
(long double x, long double y); float fdimf(float x, float y); long double fdiml(long double x, long double y); float fmax(float x, float y); double fmax(double x, double y); long double fmax(long double x, long double y); float fmaxf(float x, float y); long double fmax...
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(long double x, long double y); float fdimf(float x, float y); long double fdiml(long double x, long double y); float fmax(float x, float y); double fmax(double x, double y); long double fmax(long double x, long double y); float fmaxf(float x, float y); long double fmax...
FD_ZERO(&rdfs); FD_SET(0, &rdfs); FD_SET(s, &rdfs);timeo.tv_sec = 0; timeo.tv_usec = 10000 * loop;if ((ret = select(s+1, &rdfs, NULL, NULL, &timeo)) < 0) { //perror("select"); running = 0; continue; }gettimeofday(&tv, NULL); currcms = (tv.tv_sec - st...
int build_fdset (fd_set *readfds) { struct tunnel *tun; struct call *call; int max = 0; tun = tunnels.head; FD_ZERO (readfds); while (tun) { if (tun->udp_fd > -1) { if (tun->udp_fd > max) max = tun->udp_fd; ...
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