From:	johne AT parallax DOT co DOT uk (John Eccleston)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Help: Chaining interrupts
Date:	Tue, 28 Jan 97 15:22:34 GMT
Organization:	Parallax Solutions Ltd
Message-ID:	<854464908.638172@red.parallax.co.uk>
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To:	djgpp AT delorie DOT com
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 Eli Zaretskii wrote:
>
>On Mon, 27 Jan 1997, John Eccleston wrote:
>
>> At the risk of overstaying my welcome could someone please explain why
>> whenever I chain interrupts using: 
>> 
>>      _go32_dpmi_chain_protected_mode_interrupt_vector
>> 
>> my program crashes, but when just replacing the existing handler with a 
>> handler wrapped using:
>> 
>>      _go32_dpmi_allocate_iret_wrapper
>> 
>> everything works fine.
>
>Please post both the code which works and the one which doesn't.  It 
>isn't entirely clear what exactly do you replace with what.

Sorry Eli, and everyone else,

I have found what the problem was.  It was due to me de allocating an
IRET wrapper when unhooking the interrupt that had been chained.

Sorry for any confusion or inconvienience caused

Yours shamefacedly and apologetically

John

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