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Re: OS2200 MFD question

From	David W Schroth <davidschroth@harrietmanor.com>
Newsgroups	comp.sys.unisys
Subject	Re: OS2200 MFD question
Message-ID	<6d8rpjhf8lr1kh1epkitd50v6e21gu0qr2@4ax.com> (permalink)
References	<vltv8e$ld0n$1@dont-email.me> <15bf6012a0c40cd4d60fe63663fced61@www.novabbs.com> <06147a0a-8adf-470f-8bd2-7a295db170bc@gmail.com> <e33d4d781ed660a4fe45a29159324dc0@www.novabbs.com> <a7968c7f-ed92-43c1-abfc-2eaa5a1e33e8@gmail.com>
Organization	Forte - www.forteinc.com
Date	2025-01-31 22:30 -0600

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On Mon, 13 Jan 2025 10:02:27 -0500, Stephen Boyd <sboydlns@gmail.com>
wrote:

>On 2025-01-12 1:49 p.m., lewiscole wrote:
>
>> Well, I could be wrong, but I suspect that the Exec won't allow a user
>> to arbitrarily look at anything on disk using a IOW$ or any other I/O
>> related ER.
>>

Tou're not wrong, Lewis.

>
> From looking at an admittedly old version of MFD, this is exactly how 
>it reads the MFD. It uses ER IOW$, reads sector 0 to get the pointer to 
>the MFD and starts to read certain parts of the MFD into a temporary file.
>

While it has ben literally decades since I looked at MFD, I'm quite
sure it's not doing what you describe.  It is almost certainly reading
a snapshot of the MFD that was placed in a file specified by MFD.
As the MFD (not the program) is effectively contained in a temporary
file assigned by the Exec, there is no way for a user to read the MFD
directly. 

<snip>

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OS2200 MFD question Stephen Boyd <sboydlns@gmail.com> - 2025-01-11 09:29 -0500
  Re: OS2200 MFD question l_cole@juno.com (lewiscole) - 2025-01-11 20:06 +0000
    Re: OS2200 MFD question Stephen Boyd <sboydlns@gmail.com> - 2025-01-12 10:22 -0500
      Re: OS2200 MFD question l_cole@juno.com (lewiscole) - 2025-01-12 18:49 +0000
        Re: OS2200 MFD question R Daneel Olivaw <Danny@hyperspace.vogon.gov> - 2025-01-13 08:41 +0100
        Re: OS2200 MFD question Stephen Boyd <sboydlns@gmail.com> - 2025-01-13 10:02 -0500
          Re: OS2200 MFD question l_cole@juno.com (lewiscole) - 2025-01-15 02:04 +0000
            Re: OS2200 MFD question David W Schroth <davidschroth@harrietmanor.com> - 2025-01-31 22:34 -0600
              Re: OS2200 MFD question l_cole@juno.com (lewiscole) - 2025-02-02 20:50 +0000
                Re: OS2200 MFD question David W Schroth <davidschroth@harrietmanor.com> - 2025-02-02 20:23 -0600
          Re: OS2200 MFD question David W Schroth <davidschroth@harrietmanor.com> - 2025-01-31 22:30 -0600
            Re: OS2200 MFD question Stephen Boyd <sboydlns@gmail.com> - 2025-02-01 10:21 -0500

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