Date: Thu, 21 Jan 2016 23:45:11 +0100 From: Jilles Tjoelker <jilles@stack.nl> To: "Batutis, Ed" <Ed.Batutis@netapp.com> Cc: Mateusz Guzik <mjguzik@gmail.com>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Diane Bruce <db@db.net>, Joerg Sonnenberger <joerg@britannica.bec.de> Subject: Re: get number of open files in a process? Message-ID: <20160121224511.GA74045@stack.nl> In-Reply-To: <31126442b7d347c5976a57aabc2e5792@hioexcmbx08-prd.hq.netapp.com> References: <ea9f2ab2d4f543c8ad34fdeb082f8c7a@hioexcmbx08-prd.hq.netapp.com> <20160121153636.GA10961@britannica.bec.de> <20160121161637.GA83843@night.db.net> <20160121162527.GA11600@britannica.bec.de> <d26cc2fcea304ea6a89f61c2ec497322@hioexcmbx08-prd.hq.netapp.com> <20160121191308.GA21869@dft-labs.eu> <31126442b7d347c5976a57aabc2e5792@hioexcmbx08-prd.hq.netapp.com>
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On Thu, Jan 21, 2016 at 07:44:01PM +0000, Batutis, Ed wrote: > > However, the real question is what do you need this for. > I would like to know when I am getting close to hitting the file > handle limit. This is useful for two reasons: 1) if I run out of > available file handles this will most likely cause my process to > crash. If I start logging when the count begins to get dangerously > high, then I might after the fact be able to determine what was going > on to cause that. 2) Some handles are used by a user interface. It > would be nice if the server could reject connections when the open > handle count hit a critical threshold so the user interface doesn't > become part of the problem - obscuring the actual underlying cause. You can check the integer file descriptor that was just created, since if the descriptor is N, at least N other descriptors must be active at the same time. For example, if a new client's file descriptor is higher than the limit minus some safety margin, reject the connection. -- Jilles Tjoelker
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