add closefrom() call

[LI Xin]

Ighighi Ighighi wrote:
> The closefrom() call, available in Solaris, is present in NetBSD since
> version 3.0.
> It is implemented with the F_CLOSEM fcntl() available since version 2.0.

I think it might worth an effort (sendmail and perhaps some part of JDK
uses it IIRC), but I do not want to rush it into -CURRENT unless we have
test cases to make sure that we have done things correctly, because I do
not have a NetBSD nor Solaris box at hand to experiment its behavior... :-(

Do you have some test cases for this?

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

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