Linux Network Programming poll Model

// Distribution process // listen # include <stdio. h> # include <sys/types. h> # include <sys/socket. h> # include <sys/poll. h> # include <errno. h> # include <netinet/in. h> # include <unistd. h> # include <ARPA/inet. h> # include <stdlib. h> # define listenq 5 # define open_max 1024 # define serv_port 10088 # define max_line 1024 # define inftim-1 int main (INT argc, char ** argv) {int err, maxpoll, nreadly; struct pollfd client [open_max]; struct sock Addr_in cliaddr, servaddr; int listenfd = socket (af_inet, sock_stream, 0); If (listenfd <0) {printf ("socket function execution failed"); return 1;} servaddr. sin_family = af_inet; servaddr. sin_addr.s_addr = htonl (inaddr_any); // inet_aton ('10. 132.10.64', & (servaddr. sin_addr); // servaddr. sin_addr.s_addr = inet_addr ("10.132.10.64"); servaddr. sin_port = htons (serv_port); If (BIND (listenfd, (struct sockaddr *) & servaddr, sizeof (serva DDR) <0) {printf ("bind function execution failed"); return 1;} If (Listen (listenfd, listenq) <0) {printf ("Listen function execution failed"); return 1;} client [0]. FD = listenfd; client [0]. events = pollrdnorm; For (INT I = 1; I <open_max; I ++) {client [I]. FD =-1;} maxpoll = 0; printf ("the listen function is successfully executed \ n"); While (true) {socklen_t clilen = sizeof (cliaddr ); nreadly = poll (client, maxpoll + 1, 1000); If (Client [0]. revents & pollrdnorm) {int idx =-1; for (I NT I = 1; I <open_max; I ++) {If (Client [I]. FD <0) {idx = I; break;} If (idx =-1) {// discard connection continue;} int connfd = accept (listenfd, (struct sockaddr *) & cliaddr, & clilen); If (connfd <0) {printf ("Accept function execution failed"); break;} printf ("IP: % s to this game \ n ", inet_ntoa (cliaddr. sin_addr); client [idx]. FD = connfd; client [idx]. events = pollrdnorm; maxpoll = (idx> maxpoll? Idx: maxpoll); If (-- nreadly <= 0) {continue ;}}for (INT I = 1; I <open_max; I ++) {int sockfd = client [I]. FD; If (sockfd <0) {continue;} If (Client [I]. revents & (pollrdnorm | pollerr) {char line [max_line]; int n = read (sockfd, line, sizeof (line); If (n <0) {If (errno = econnreset) {close (sockfd); client [I]. FD =-1; printf ("abnormal exit \ n");} else {printf ("network exception"); exit (-1 );}} else if (n = 0) {close (sockfd); client [I]. FD =-1; printf ("normal exit \ n");} else {line [N] = 0; printf ("received data: % s \ n ", line); write (sockfd, line, n);} If (-- nreadly <= 0) {continue ;}}}}}