Date: Wed, 11 Nov 1998 08:25:31 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: nate@mt.sri.com (Nate Williams) Cc: hackers@FreeBSD.ORG Subject: Re: Supporting more than FD_SETSIZE fd's Message-ID: <199811110825.BAA06296@usr02.primenet.com> In-Reply-To: <199811091734.KAA04752@mt.sri.com> from "Nate Williams" at Nov 9, 98 10:34:00 am
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> I looked through the handbook and the FAQ and didn't find anything, so > hopefully someone can help me out. > > I need to support more than the default 255 FD's in an application (the > JDK for what it's worth). To be portable, the code uses fd_set as > defined in <sys/types.h>. Unfortunately, unless I redefine FD_SETSIZE > in every file that uses it, I still have a hard-limit on the number of > FD's the application can use. > > Is there any 'portable' way of getting around this? Redefine FD_SETSIZE. If you don't wwant to do it in every file that uses it, then either do it in the header file itself, or add -DFD_SETSIZE=1024 to CFLAGS. > I'd really like to > have it use whichever open FD that the limit allows, but I know now way > of having this happen? I can't really parse this. The "the limit allows" value is based on how many contiguous bits there are in an fd_set, which is based on the value of FD_SETSIZE at the time the fd_set is declared. Basically, the first argument is how many bits into the fd_set that select is supposed to index looking for FD_ISSET bits to select fd's to select on... Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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