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From: jilles@FreeBSD.org
Subject: Re: kern/176233: [libc] [patch] New dup3() implementation for FreeBSD
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Synopsis: [libc] [patch] New dup3() implementation for FreeBSD

Responsible-Changed-From-To: freebsd-bugs->jilles
Responsible-Changed-By: jilles
Responsible-Changed-When: Sun Mar 17 21:02:20 UTC 2013
Responsible-Changed-Why: 
I plan to commit this because it seems dup3() is a bit more
popular than fcntl(F_DUP2FD_CLOEXEC). This may be after the
other CLOEXEC changes.

Regarding use, it appears that APR can use this, and I even used
F_DUP2FD_CLOEXEC myself in freopen().

http://www.freebsd.org/cgi/query-pr.cgi?pr=176233