linux-kernel - Re: New system call wanted: fdreopen

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Message-ID: <20121210211853.19957787m6em7c4k@guarana.org>
Date:	Mon, 10 Dec 2012 21:18:53 +1100
From:	Kevin Easton <kevin@...rana.org>
To:	Tristan Wibberley <tristan.wibberley@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: New system call wanted: fdreopen

Quoting Tristan Wibberley <tristan.wibberley@...il.com>:

> Why
> ===
>
> 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.

Another alternative is to use pwrite() / pread(), which do not affect the file
pointer.  They're in POSIX.

     - Kevin


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