From owner-freebsd-hackers@FreeBSD.ORG  Thu Dec  9 00:20:47 2010
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Date: Thu, 09 Dec 2010 02:20:39 +0200
From: Andriy Gapon <avg@freebsd.org>
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To: Matthew Fleming <mdf356@gmail.com>
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Cc: Bruce Cran <bruce@cran.org.uk>,
	FreeBSD-Hackers <freebsd-hackers@freebsd.org>,
	Chuck Robey <chuckr@telenix.org>
Subject: Re: getting a list of open files versus PID nos.?
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on 09/12/2010 01:47 Matthew Fleming said the following:
> On Wed, Dec 8, 2010 at 3:01 PM, Bruce Cran <bruce@cran.org.uk> wrote:
>> On Wed, 8 Dec 2010 14:54:57 -0800
>> Matthew Fleming <mdf356@gmail.com> wrote:
>>
>>> This is what lsof is for.  I believe there's one in ports, but I have
>>> never tried it.
>>
>> Is there any advantage to using lsof instead of fstat(1) (fstat -p pid)?
> 
> I believe that lsof reports on all open files by all processes,
> whereas fstat will only report on a specific provided pid.

Just try running fstat without any options.
Or procstat -a -f.

-- 
Andriy Gapon