Mail Archives: djgpp-workers/1996/10/16/13:18:00
On Tue, 15 Oct 1996, John M. Aldrich wrote:
>Ok, here's a basic explanation of the way my modified stub code works.
>:)
>This seems to me to be all that's needed to make any program fully
>capable of self-diagnosis. You can do one of two things in your
Agreed.
>installer:
>1) Write the installer as a real mode program and have it invoke the
>djverify executable _directly_, interpreting the return code itself. As
>an alternative, bind a real-mode executable to the complete djgpp
>program.
I planned to do so (even started to write in TC) but after the discussion and
giving it a thought installer's gonna be a DJGPP app.
>2) Write the installer as a djgpp program and bind it with the _custom_
>stub, then use a batch file similar to mine to interpret any resulting
>error.
That's the route to take.
>NOTE: If you follow the latter route, you should be aware of a
>potential pitfall in the way djgpp handles the SIGINT signal. If you
>don't handle SIGINT (Ctrl-C) yourself, your program will return an error
>code of 255 when it exits, which will make the batch file barf thinking
>it is dealing with a standard stub. The solution (which I followed in
>djverify) is to install a handler for SIGINT which returns a benign
>error code such as 1. I discovered this minor problem while debugging a
>poorly written use of cgets() in my program. :) I don't yet know about
>Ctrl-Break handling.
Isn't Ctrl-Break handled by BIOS and intercepted by DOS which is, in turn,
intercepted by our signal handler?
>As for archiving methods, the only one I'm really familiar with is
>pkzip, but you can use pkzip to create a self-extracting archive. You
>can also bind a comment to the archive that is automatically displayed
>when the archive itself is extracted. It could contain a basic blurb
>plus instructions to run "install". I'm sure something similar is
They say there are zip2sfx converters that allow you to run a specified file
in the end of unpacking process. Have any idea on where to find one?
>possible with the various freeware archivers, but it's best if we make
>the distribution in a familiar format.
Well, there's always RAR with its script language. What do you think?
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