From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: My INT 1 handler crashes under Windows 95
Date: Wed, 16 Dec 1998 10:18:20 +0200
Organization: NetVision Israel	
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On Wed, 9 Dec 1998 sjoerd DOT s DOT bakker AT tip DOT nl wrote:

> The following test-code installs a protected mode  INT 1 (single-step)
> handler that runs well with CWSDPMI but crashes under Windows 95 with
> a registerdump caused by SIGTRAP.

INT 1 is not a hardware interrupt in the normal sense.  Try installing a 
signal handler for SIGTRAP instead.  You will probably need to make the 
handler do a longjmp (instead of returning to the caller), to prevent the 
program from crashing.