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From: mts@EMPTYS.CC.UMICH.EDU (Michael T. Stolarchuk)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: HELP: select() under sockets
Message-ID: <8709090100.AA06470@emptys.cc.umich.edu>
Date: Tue, 8-Sep-87 21:00:15 EDT
Article-I.D.: emptys.8709090100.AA06470
Posted: Tue Sep  8 21:00:15 1987
Date-Received: Thu, 10-Sep-87 01:40:38 EDT
References: <8709081702.AA00208@apolling.imagen.uucp>
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	Umm, I just looked into /usr/include/stdio.h on our apollo system:
	 
	    Changelog entry:
		10/01/82 jrw  increased _NFILE from 20 to 128.....
	 
	So using NFILE is probably NOT the way to go, unless you declare
	readfds, et al as arrays (this leads one to wonder, of course, why
	the existing apollo software works at all -- since I know of no code
	that actually uses arrays with select.  Probably because no one actually
	opens more than 32 file descriptors and only THEN creates a socket...).
 
 How about 4.3? Where select is:
 
	nfound = select(nfds, readfds, writefds, exceptfds, timeout)
	        int nfound, nfds;
	   	fd_set *readfds, *writefds, *exceptfds;
		struct timeval *timeout;
	
 And you have:
	FD_SET(fd, &fdset)
	FD_CLR(fd, &fdset)
	FD_ISSET(fd, &fdset)
	FD_ZERO(&fdset)

 And fd_set is:
	typedef struct fd_set {
		fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
		} fd_set;

 And FD_SETSIZE is 256.


mts. the snail.  imagine him at 100 mhp.