From owner-freebsd-hackers@freebsd.org  Sun Oct 25 19:43:38 2015
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Date: Sun, 25 Oct 2015 20:43:35 +0100
From: Ivan Radovanovic <radovanovic@gmail.com>
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To: freebsd-hackers@FreeBSD.org
Subject: Opening file to be used with kevent
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Hi guys,

What are recommended flags to use when opening file descriptor to be 
used later with kevent(2)?

I was thinking to specify O_RDONLY but I guess that would prevent any 
other process from opening file with O_EXCL (and I don't care about file 
contents anyway, I just want to be notified when file is changed). 
Apparently Darwing has O_EVTONLY for this purpose, so I am wondering if 
FreeBSD has something equivalent (or what would be the weakest mode to 
pass to open(2))?

Kind regards,
Ivan