Message-Id: <m0z0nxd-000S5dC@inti.gov.ar>
Comments: Authenticated sender is <salvador AT natacha DOT inti DOT gov DOT ar>
From: "Salvador Eduardo Tropea (SET)" <salvador AT inti DOT gov DOT ar>
Organization: INTI
To: DJ Delorie <dj AT delorie DOT com>, djgpp-workers AT delorie DOT com
Date: Mon, 27 Jul 1998 11:18:52 +0000
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Subject: Re: Pipes
In-reply-to: <199807271309.JAA21579@delorie.com>
References: <m0z0mMW-000S4WC AT inti DOT gov DOT ar> (salvador AT inti DOT gov DOT ar)
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DJ Delorie <dj AT delorie DOT com> wrote:
 
> * gdb traps the program exit.  Do the same thing as it does.
> 
> * In fact, gdb traps int 0x31.  Maybe your shell could somehow trap
>   that *before* it gets to the DPMI server, so that longjump is still an
>   option?

Hmmm.... but I want a djgpp shell because in this way we can try to add it to 
bash.
 
> * Why not add a FSEXT that implements named pipes via your shell?

Don't know what's it. Please explain me a little.
 
> * Has anyone tried longjumping from one djgpp program to another
>   (parent/child) program?  If this works, the fsext can longjump
>   to the shell, which can longjump to the other programs.

I tried both:

1) longjmps between 2 djgpp programs loaded in RAM.
2) longjmps through the shell (3 djgpp programs).

And yes it works but I'm having big troubles with spawn re-entrancy. I 
explain it with details in the mail "Pipes".
I think the only way to do all with djgpp stuff is to have just 1 djgpp task 
running from the DPMI point of view. And then make longjmps inside this "big 
djgpp task". With it we won't have DPMI problems. But the exit clean up must 
be done in the shell and not in __exit. That can be done just making a hook 
in __exit to longjmp to the shell passing all the needed information in the 
transfer buffer. Then the shell just makes the needed clean up.

SET
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