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Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!gatech!mcdchg!chinet!les
From: les@chinet.chi.il.us (Leslie Mikesell)
Newsgroups: comp.unix.questions,comp.unix.xenix
Subject: Re: How to determine file being redirected to in C
Summary: RFS question
Message-ID: <7869@chinet.chi.il.us>
Date: 5 Mar 89 04:48:33 GMT
References: <10@sherpa.UUCP> <169@usource.UUCP> <1111@auspex.UUCP>
Reply-To: les@chinet.chi.il.us (Leslie Mikesell)
Followup-To: comp.unix.questions
Distribution: na
Organization: Chinet - Public Access Unix
Lines: 19

In article <1111@auspex.UUCP> guy@auspex.UUCP (Guy Harris) writes:
>>Then you compare st_ino and st_dev in both returned structures.  If both
>>sets match (ie r.st_ino == f.st_ino && r.st_dev == f.st_dev)
>>then they must be the same file.  (Network fans: is this true
>>for remotely-mounted filesystems?)

>It's true of the SunOS NFS implementation, and probably on all NFS
>implementations derived from it.  The AT&T S5R3 RFS implementation looks
>as if it attempts to preserve this property, also. 

Does st_dev become unique for each remote filesystem or does it just
get a bit set to indicate that it is remote?  If the latter case is true
then the test above might falsely indicate that files on two different
remote systems were the same file.  Hmmm, cpio and tar might get confused
also and think the files should be linked - something to consider with the
versions that only store the first copy in the archive (GNUtar, PAX, perhaps
others).

Les Mikesell