From: Martin Str|mberg <ams AT ludd DOT luth DOT se>
Message-Id: <200104151631.SAA16496@mother.ludd.luth.se>
Subject: Re: _creatnew() failing
To: djgpp-workers AT delorie DOT com
Date: Sun, 15 Apr 2001 18:31:16 +0200 (MEST)
In-Reply-To: <Pine.SUN.3.91.1010415181804.20107C@is> from "Eli Zaretskii" at Apr 15, 2001 06:22:40 PM
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According to Eli Zaretskii:
> On Sun, 15 Apr 2001, Martin Str|mberg wrote:
> 
> > It has been hammered into me that unsupported INT21 functions do not
> > set the carry flag and only set AL to 0.
> 
> ...except when documented otherwise.  RBIL says that function 6Ch sets 
> the carry flag when it fails.

There's a difference between failure and unimplemented...

> > FreeDOS claims to be DOZE 5.0 but it does not support INT21,
> > AX=0x6c00. So this _creatnew() happily thinks is has successfully
> > opened/created the file in question.
> 
> RBIL says something similar about DRDOS:
> 
>         DR DOS reportedly does not support this function and does not return
>           an "invalid function call" error when this function is used.
> 
> I guess we need to test _os_flavor in addition to _osmajor, in this 
> case.

Not for FreeDOS. It has the beginnings of an implementation (and
somebody is probably going to complete it). Even if it didn't, FreeDOS
has a VERSION= directive for CONFIG.SYS.


Right,

						MartinS