Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!decwrl!mcnc!ecsgate!seq!session
From: session@seq.uncwil.edu (Zack C. Sessions)
Newsgroups: comp.os.os9
Subject: Re: open() + sharable file = no disk
Message-ID: <1656@seq.uncwil.edu>
Date: 11 Jun 91 19:40:20 GMT
References: <1991Jun11.012640.904@tkou02.enet.dec.com>
Organization: Univ. of North Carolina @ Wilmington
Lines: 36


Wow, have you ever found a strange one!!

I tried your program on my system, a 512K CoCo3 with OS-9 Level 2,
the original Microware C Compiler and the Dev Pack Ramdisk. The
only possible difference is that I am using the Kreider Lib, but
I would be surprised to find that Carl's open() function would work
any different from the stock version. But it does!!

First off, it is my understanding that the s attribute is not the
"sharable" attribute, but the "single-user" attribute. According to
the Tech Ref, if this bit is on in the file's attribute mask, then
only one process can have an active path to it at one time. It also
goes on to state that you can specify this bit on during the Open
call to temporarily dis-allow any other access as long as you have
it opened that way.

Only thing is, the second method does not appear to work!! While I
cannot get the program to successfully open a file or directory
with the single user bit on, though, it doesn't trash my disk.
Files and directories are all still there and readable, but the
program does return an Error 203, Illegal mode!! No ownership
problems, since all is being done from userid 0.

So, basically I can't say what is happening to you except that I
cannot get the single-user access bit to work either, but it doesn't
trash the file system on the disk I test it with.

Maybe Kev will see this and respond!

Zack Sessions
session@seq.uncwil.edu
      ^^^
       |
       +---> Note: username is session, not sessions. Not my fault, ask
                   my SysAdmin about it!!