Category : C++ Source Code
Archive   : VCCRT2.ZIP
Filename : D_GETVEC.ASM

page ,132
title d_getvec - Get Interrupt Vector
;***
;d_getvec.asm - Get interrupt vector
;
; Copyright (c) 1987-1992, Microsoft Corporation. All rights reserved.
;
;Purpose:
; Direct interface to DOS "get interrupt vector" system call.
;
;*******************************************************************************

include version.inc
.xlist
include cmacros.inc
include msdos.inc
.list

sBegin code

assumes cs,code
assumes ds,data

page
;***
;far *_dos_getvect(interrupt) - Get interrupt vector
;
;Purpose:
; Direct interface to the DOS "get interrupt vector"
; system call (int 21h,35h).
;
;Entry:
; unsigned interrupt = interrupt vector value
;
;Exit:
; Returns the current interrupt handle for the specified
; interrupt, if any. There is no error return.
;
;Uses:
; BX
;
;Exceptions:
; None
;
;*******************************************************************************

cProc _dos_getvect,,<>

parmW intnum

cBegin

mov ax,[intnum] ;get the interrupt number
callos getvector ;get the interrupt handler
mov dx,es ;return current handler in DX:AX
mov ax,bx

cEnd

sEnd
end