help in finding which machine a file is actually stored on

[MFHorn]

>From article <8204 at thorin.cs.unc.edu>, by sunj at 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 at 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