HP-3000 Systems Discussion <[log in to unmask]> wrote on 07/19/2004
12:42:23 AM:

<<snip>>
>
> So how do the Rooskie guys aka Vesoft comrades get the caps of a file?
>
"EXECUTABLE" files on the HP have their capabilities stored in the first
record of the file (word 1 and word 50 for 'PROG' & 'NMPRG' respectively).
The VESOFT folks, I suspect, merely read the first sector of the file and
parse the capability bits.  I also suspect that they use some 'direct disk
access' routine using the address of the file's first extent and thus
bypassing the file system.

<<snip>>
>
> Barry, I tried your CREATEPROCESS idea. Works great with a big GOTCHA..
>
> If a program file is not :RUNable (for whatever reason, unresolved
> externals, Illegal caps etc) the process is not created and so if the
file
> truly has PM caps the AIF "AIFPROCGET" will never see it because the
> process was not created.
>

Perhaps the more reliable way would be to read the file, but even that
approach has some shortcomings.  MPE/iX keeps a number of 'essential' files
open in order to avoid accidental removal.  Finding the correct 'aoptions'
that will allow you to open the file may prove a bit complicated (that is
why I suspect the VESOFT folks bypass the file system).

Regards
Paul Christidis

> TIA,
> Brian.
>
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