Network Programming Question. I need to add code to allow the server to be able to use as many descriptors as currently allowed by the kernel. The code is below, but I'm not sure how to modify this. I need to use the getrlimit function to fetch the values for the RLIMIT_NOFILE resource and then call setrlimit to set the current soft limit (rlim_cur) to the hard limit (rlim_max). For example, under Solaris 2.5, the soft limit is 64 but any process can increase this to the default hard limit of 1,024.

/* include fig01 */ #include "unp.h"

int main(int argc, char **argv) { int i, maxi, maxfd, listenfd, connfd, sockfd; int nready, client[FD_SETSIZE]; ssize_t n; fd_set rset, allset; char buf[MAXLINE]; socklen_t clilen; struct sockaddr_in cliaddr, servaddr;

listenfd = Socket(AF_INET, SOCK_STREAM, 0);

bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(SERV_PORT);

Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));

Listen(listenfd, LISTENQ);

maxfd = listenfd; /* initialize */ maxi = -1; /* index into client[] array */ for (i = 0; i < FD_SETSIZE; i++) client[i] = -1; /* -1 indicates available entry */ FD_ZERO(&allset); FD_SET(listenfd, &allset); /* end fig01 */

/* include fig02 */ for ( ; ; ) { rset = allset; /* structure assignment */ nready = Select(maxfd+1, &rset, NULL, NULL, NULL);

if (FD_ISSET(listenfd, &rset)) { /* new client connection */ clilen = sizeof(cliaddr); connfd = Accept(listenfd, (SA *) &cliaddr, &clilen); #ifdef NOTDEF printf("new client: %s, port %d ", Inet_ntop(AF_INET, &cliaddr.sin_addr, 4, NULL), ntohs(cliaddr.sin_port)); #endif

for (i = 0; i < FD_SETSIZE; i++) if (client[i] < 0) { client[i] = connfd; /* save descriptor */ break; } if (i == FD_SETSIZE) err_quit("too many clients");

FD_SET(connfd, &allset); /* add new descriptor to set */ if (connfd > maxfd) maxfd = connfd; /* for select */ if (i > maxi) maxi = i; /* max index in client[] array */

if (--nready <= 0) continue; /* no more readable descriptors */ }

for (i = 0; i <= maxi; i++) { /* check all clients for data */ if ( (sockfd = client[i]) < 0) continue; if (FD_ISSET(sockfd, &rset)) { if ( (n = Read(sockfd, buf, MAXLINE)) == 0) { /*4connection closed by client */ Close(sockfd); FD_CLR(sockfd, &allset); client[i] = -1; } else Writen(sockfd, buf, n);

if (--nready <= 0) break; /* no more readable descriptors */ } } } } /* end fig02 */