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

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Date:	Sun, 9 Dec 2012 13:37:33 -0600
From:	Chris Adams <cmadams@...aay.net>
To:	linux-kernel@...r.kernel.org
Subject: Re: New system call wanted: fdreopen

Once upon a time, Tristan Wibberley  <tristan.wibberley@...il.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@...aay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
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