add closefrom() call

[Ighighi]

 >Date: Mon, 09 Jul 2007 15:00:21 +0800
 >From: LI Xin <delphij at delphij.net <mailto:delphij at delphij.net>>
 >Subject: Re: add closefrom() call
 >To: Robert Watson <rwatson at FreeBSD.org <mailto:rwatson at FreeBSD.org>>
 >Cc: FreeBSD Hackers <freebsd-hackers at freebsd.org 
<mailto:freebsd-hackers at freebsd.org>>, d at delphij.net <mailto:d at delphij.net>,
       Julian Elischer <julian at elischer.org 
<mailto:julian at elischer.org>>, Ed Schouten <ed at fxq.nl <mailto:ed at fxq.nl>>
 >Message-ID: <4691DD05.2090407 at delphij.net 
<mailto:4691DD05.2090407 at delphij.net>>
 >Content-Type: text/plain; charset="iso-8859-1"

LI Xin wrote:
 >Nope.
 >
 >I will try to see if we have some way to expose lastfile to userland, or
 >whether we have some better approach to implement this in userland next
 >week if I would have some spare time...

F_MAXFD is easy to implement... Attached is a diff that should work for 
CURRENT.
I'm working on a 6-STABLE.
See closefrom.c for an implementation based on F_MAXFD.
Still, it doesn't pay to implement it this way...
Calling F_MAXFD everytime we close a file descriptor would be heavy 
having too much fd's.
On the other hand, it wouldn't make much a difference to just start from 
getdtablesize() - 1.

 >Cheers,
 >--
 >Xin LI <delphij at delphij.net <mailto:delphij at delphij.net>>   
 http://www.delphij.net/
 >FreeBSD - The Power to Serve!
   
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