Date: Tue, 7 Oct 1997 18:01:46 +0000 (   )
From: "Gurunandan R. Bhat" <grbhat AT unigoa DOT ernet DOT in>
To: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Cc: djgpp AT delorie DOT com
Subject: Re: three .externs whose purpose and origin I know not
In-Reply-To: <Pine.SUN.3.91.971007152235.25685U-100000@is>
Message-Id: <Pine.LNX.3.91.971007175832.2426A-100000@aditya.unigoa.ernet.in>
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On Tue, 7 Oct 1997, Eli Zaretskii wrote:
> 
> On Thu, 2 Oct 1997, Arthur Bredrick wrote:
> 
> >   .extern ___djgpp_base_address
> >   .extern ___djgpp_ds_alias
> >   .extern ___djgpp_dos_sel
> >

[snipped]

> (the usual DS selector is made
> invalid when a signal, such as SIGINT, is pending, while the alias
> selector is *always* valid, and should therefore be used by interrupt
> handlers).
> 

Very important advice. Shouldn't this be documented 
somewhere?. If it isn't already that is.