Path: utzoo!mnetor!uunet!husc6!cmcl2!phri!manhat!mancol!jh
From: jh@mancol.UUCP (John Hanley)
Newsgroups: comp.sys.ibm.pc
Subject: Re: _dos_setvect in MS C 5.0
Message-ID: <277@mancol.UUCP>
Date: 22 Feb 88 21:25:30 GMT
References: <788@imsvax.UUCP>
Reply-To: hanley@nyu.edu (John Hanley)
Organization: Manhattan College
Lines: 24
Keywords: example requested

Has anyone succesfully used the _dos_setvect() library function in MS C?
A complete example program would be GREATLY appreciated.
Page 224 of the run-time library manual gives the following information:
	#include <dos.h>
	void _dos_setvect( intnum, void(handler)());
	unsigned intnum;           /* Target interrupt vector               */
	interrupt far *handler;    /* Interrupt handler to assign intnum to */

but I have _no_ idea how to call it correctly.  The idea is that you write
a handler function that gets called every INT 'intnum' is generated.  The
handler can be a C function previously declared with the interrupt attribute.
I did that but then none of the dozen or so combinations I tried for calling
_dos_setvect got past the compiler without a 'must be a function/pointer to a 
function' error ocassionally, or a 'redifinition' error when handler was 
declared as a type other than void.

BTW, cdecl (from info-server@sh.cs.net) is usually great for declaration
problems like this, but it doesn't seem to handle "void".

-- 
             --John Hanley
              System Programmer, Manhattan College
              soon to be a former E.E./CS undergrad (May is fast approaching!)
              ..!cmcl2.nyu.edu!manhat!jh  or  hanley@nyu.edu   (CMCL2<=>NYU.EDU)