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Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ulowell!arosen@hawk.ulowell.edu
From: arosen@hawk.ulowell.edu (MFHorn)
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: help in finding which machine a file is actually stored on
Message-ID: <13397@swan.ulowell.edu>
Date: 23 May 89 20:13:35 GMT
References: <8204@thorin.cs.unc.edu>
Sender: news@swan.ulowell.edu
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From article <8204@thorin.cs.unc.edu>, by sunj@unc.cs.unc.edu (John Sun):
> I need help some help in determining the actual machine a file is stored
> on.  What I am looking for is a routine that given an absolute file name
> returns the machine it is stored on in a NFS environment.  Is there a
> "system" call that does this?  If not, any pointers in helping me write
> such a routine would be appreciated.  Thanks!

Here's one way (probably not the only way).  I'm assuming a BSD-like
system with a sane stat(2) struct, /etc/fstab and getfsent(3).

-Stat(2) the file and save the st_dev field.
-Look through /etc/fstab (see getfsent(3)), and stat(2) each mount
 point (the fs_file field).
-If the st_dev fields match, you've got the right filesystem.

You can then check fs_type to see what type of filesystem it's on,
and fs_spec to find the system the file is on.

--
Andy Rosen           | arosen@hawk.ulowell.edu | "I got this guitar and I
ULowell, Box #3031   | ulowell!arosen          |  learned how to make it
Lowell, Ma 01854     |                         |  talk" -Thunder Road
		RD in '88 - The way it should've been