From owner-freebsd-hackers@freebsd.org  Thu Jan 21 15:36:42 2016
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Date: Thu, 21 Jan 2016 16:36:36 +0100
From: Joerg Sonnenberger <joerg@britannica.bec.de>
To: "Batutis, Ed" <Ed.Batutis@netapp.com>
Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>
Subject: Re: get number of open files in a process?
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On Thu, Jan 21, 2016 at 01:34:18PM +0000, Batutis, Ed wrote:
> I need to determine the number of open files in my process - all types of file handles total - sockets, files, everything.

Use getdtablesize() to get the current largest known fd. If you want,
you can afterwards loop and use fcntl with F_GETFD to check if the
descriptor is still open.

Joerg