en:docs:dos:api:int21:45

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

2018/09/07 07:04 · prokushev

Int 21H, AH=45H

Version

2 and higher

Brief

“DUP” - DUPLICATE FILE HANDLE

Family API

Input

AH = 45h
BX = file handle

Return

CF clear if successful

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

Notes

moving file pointer for either handle will also move it for the other,
  because both will refer to the same system file table
for DOS versions prior to 3.3, file writes may be forced to disk by
  duplicating the file handle and closing the duplicate
        

See also

AH=3Dh,AH=46h

Note


en/docs/dos/api/int21/45.txt · Last modified: 2021/05/01 17:44 by prokushev