Date: Fri, 22 Jan 2016 09:41:02 -0500 From: Diane Bruce <db@db.net> To: Mateusz Guzik <mjguzik@gmail.com>, Jilles Tjoelker <jilles@stack.nl>, "Batutis, Ed" <Ed.Batutis@netapp.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: <20160122144102.GA92956@night.db.net> In-Reply-To: <20160121225111.GB21869@dft-labs.eu> 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> <20160121224511.GA74045@stack.nl> <20160121225111.GB21869@dft-labs.eu>
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On Thu, Jan 21, 2016 at 11:51:11PM +0100, Mateusz Guzik wrote: > On Thu, Jan 21, 2016 at 11:45:11PM +0100, Jilles Tjoelker wrote: > > On Thu, Jan 21, 2016 at 07:44:01PM +0000, Batutis, Ed wrote: ... > > This cannot work. POSIX mandates the lowest free fd is returned, so the > N you see here can be extremely low, while the process is running out of > fds. The hack not mentioned here of course is to (mis-)use dup2() to shuffle all your other fd's down by one as you close them. ;) (This actually was used in early versions of the IRC Daemon. ;) Not for this reason however. ) > one to take - you have to have a very big reserve to not suddenly run > out of fds, one would just limit amount of clients and, well, handle > errors as they can pop up for reasons other than running out of fd slots. I agree. > > -- > Mateusz Guzik <mjguzik gmail.com> > Diane -- - db@FreeBSD.org db@db.net http://www.db.net/~db
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