From: Chris Wright <chris@wirex.com>
To: Nav Mundi <nmundi@karthika.com>
Cc: linux-kernel@vger.kernel.org, apiggyjj@yahoo.ca
Subject: Re: 'fd' file descriptor help
Date: Thu, 6 Dec 2001 13:45:19 -0800 [thread overview]
Message-ID: <20011206134519.A19511@figure1.int.wirex.com> (raw)
In-Reply-To: <20011206211817.FAUB17034.tomts10-srv.bellnexxia.net@there>
In-Reply-To: <20011206211817.FAUB17034.tomts10-srv.bellnexxia.net@there>; from nmundi@karthika.com on Thu, Dec 06, 2001 at 04:18:05PM -0500
* Nav Mundi (nmundi@karthika.com) wrote:
> Does anyone know what the file descriptor 'fd' pointer does? My module makes
> a system call [sys_open] to the kernal which then returns a fd value but I
> don't know what this value means or how it gets it. Does the fd value
> signify a specific device or is it random? Any ideas?
fd is a handle for the kernel file struct representing the file you
opened. read include/linux/file.h::fd_install() to understand where
it's put, and include/linux/file.h::fcheck() as an example of retrieving
kernel object from the handle.
cheers,
-chris
prev parent reply other threads:[~2001-12-06 21:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-06 21:18 Nav Mundi
2001-12-06 21:45 ` Chris Wright [this message]
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