From: Chris Adams <cmadams@hiwaay.net>
To: linux-kernel@vger.kernel.org
Subject: Re: New system call wanted: fdreopen
Date: Sun, 9 Dec 2012 13:37:33 -0600 [thread overview]
Message-ID: <20121209193733.GA15378@hiwaay.net> (raw)
In-Reply-To: <ka2982$ra3$1@ger.gmane.org>
Once upon a time, Tristan Wibberley <tristan.wibberley@gmail.com> said:
>A common idiom on Linux is to open a file and keep the fd open so that
>the underlying file can be unlinked from its directory. But if the file
>needs to be read from several different parts of the codebase then due to
>the file descriptor having exactly one read pointer those different parts
>must be synchronised which is a relatively difficult task.
I think you can get similar behavior entirely in user space and in a
fashion portable to at least BSD systems. You could fork() (which would
create a separate FD in the child), pass the FD back to the parent over
a socket, and then have the child exit.
--
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
next prev parent reply other threads:[~2012-12-09 19:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-09 15:03 New system call wanted: fdreopen Tristan Wibberley
2012-12-09 16:27 ` Theodore Ts'o
2012-12-09 17:18 ` Tristan Wibberley
2012-12-09 19:37 ` Chris Adams [this message]
2012-12-09 20:47 ` Al Viro
2012-12-10 10:18 ` Kevin Easton
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