en:docs:dos:api:int21:46

Note: This API call is for DOS personality only. Use Family API for portability.

2018/09/07 07:04 · prokushev

Int 21H, AH=46H

Version

2 and higher

Brief

“DUP2”, “FORCEDUP” - FORCE DUPLICATE FILE HANDLE

Family API

Input

AH = 46h
BX = file handle
CX = file handle to become duplicate of first handle

Return

CF clear if successful

CF set on error
    AX = error code (04h,06h) (see #01680 at AH=59h/BX=0000h)

Notes

closes file with handle CX if it is still open
DOS 3.30 hangs if BX=CX on entry
moving file pointer for either handle will also move it for the other,
  because both will refer to the same system file table
        

See also

AH=3Dh,AH=45h

Note


en/docs/dos/api/int21/46.txt · Last modified: 2021/05/01 17:48 by prokushev