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oldlinux-files/docs/interrupts/int-html/rb-2931.htm
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<TITLE>Int 21/AH=45h
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Int 21/AH=45h - DOS 2+ - DUP - DUPLICATE FILE HANDLE -
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
">
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<h2>Int 21/AH=45h
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<h3><font color=#C00040>DOS 2+ - DUP - DUPLICATE FILE HANDLE</font></h3>
<PRE>
AH = 45h
BX = file handle<br>
<p><b>Return:</b><br>CF clear if successful
AX = new handle
CF set on error
AX = error code (04h,06h) <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01680 at AH=59h/BX=0000h)
</PRE>
<p><b>Notes:</b>
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
<p><b>See Also:</b>
<a href="rb-2779.htm" tppabs="http://www.ctyme.com/intr/rb-2779.htm">AH=3Dh</a> - <a href="rb-2932.htm" tppabs="http://www.ctyme.com/intr/rb-2932.htm">AH=46h</a>
<p>
<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
DOS Kernel</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
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