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Date: Tue, 10 Nov 2015 22:23:32 +0100
From: Ivan Radovanovic <radovanovic@gmail.com>
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To: Konstantin Belousov <kostikbel@gmail.com>
CC: freebsd-hackers@FreeBSD.org
Subject: Re: Detecting new file name after receiving kevent's NOTE_RENAME
References: <5641A2A5.7070909@gmail.com> <20151110081421.GL2257@kib.kiev.ua>
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On 11/10/15 09:14, Konstantin Belousov napisa:
>> >I am wondering is there some more clever way to get this new name
>> >(kernel is obviously aware of it, otherwise it couldn't notify
>> >descriptor about rename)?
 >
> The most correct way is to use sysctl kern.proc.filedesc and look
> for the path of the given file descriptor. This is inefficient since
> kern.proc.filedesc returns information about all opened files for the
> process.

Unfortunately it seems that this method (at least using 
kinfo_getfile(3)) doesn't work - as soon as file is renamed kf_path 
returned contains only zeros. Shame, it sounded like perfect solution 
for the problem...