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<TITLE>Int 21/AH=40h
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Int 21/AH=40h - PC/TCP IPCUST.SYS - WRITE CONFIGURATION DATA -
AH = 40h
BX = handle for character device $IPCUST
CX = number of bytes to write
DS:DX - buffer for configuration data (AH=3FhIPCUST)
Return: CF clear if successful
AX = number of bytes actually written
CF set on error
AX = error code (05h,06h) (see #01680 at AH=59h/BX=0000h)
Notes: if less than the entire data is read or written, the next read/write
continues where the previous one ended; IOCTL calls AX=4402h and
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<h2>Int 21/AH=40h
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<h3><font color=#C00040>PC/TCP IPCUST.SYS - WRITE CONFIGURATION DATA</font></h3>
<PRE>
AH = 40h
BX = handle for character device "$IPCUST"
CX = number of bytes to write
DS:DX -> buffer for configuration data (AH=3Fh"IPCUST")<br>
<p><b>Return:</b><br>CF clear if successful
AX = number of bytes actually written
CF set on error
AX = error code (05h,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>
If less than the entire data is read or written, the next read/write
continues where the previous one ended; IOCTL calls AX=4402h and
AX=4403h both reset the location at which the next operation starts
to zero.
The data pointer is also reset to zero if the previous read or write
reached or exceeded the end of the data, when the current function
is read and the previous was write, or vice versa.
V2.1+ uses a new configuration method, but allows the installation
of IPCUST.SYS for backward compatibility with other software which
must read the PC/TCP configuration
<p><b>See Also:</b>
<a href="rb-2785.htm" tppabs="http://www.ctyme.com/intr/rb-2785.htm">AH=3Fh"IPCUST"</a> - <a href="rb-2785.htm" tppabs="http://www.ctyme.com/intr/rb-2785.htm">AX=4402h"IPCUST"</a>
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- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
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