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<TITLE>Int 61/AH=20h
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Int 61/AH=20h - PC/TCP kernel v2.05+ - set_option - SET AN OPTION ON A DESCRIPTOR -
AH = 20h
BX = network descriptor
CX = length of buffer (usually 04h)
DS:DX - buffer containing option
SI = (ignored by v2.2-)
DI = option to set (see #03468)
Return: CF clear if successful
CF set on error
AX = error code (see #03319 at INT 61FTP Software)
Notes: Beame&Whiteside's BWPCTCP shim only supports options 01h and 0Bh; all
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<h2>Int 61/AH=20h
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<h3><font color=#C00040>PC/TCP kernel v2.05+ - set_option - SET AN OPTION ON A DESCRIPTOR</font></h3>
<PRE>
AH = 20h
BX = network descriptor
CX = length of buffer (usually 04h)
DS:DX -> buffer containing option
SI = (ignored by v2.2-)
DI = option to set <a href="rb-6857.htm#Table3468" tppabs="http://www.ctyme.com/intr/rb-6857.htm#Table3468">(see #03468)</a><br>
<p><b>Return:</b><br>CF clear if successful
CF set on error
AX = error code <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 #03319 at INT 61"FTP Software")
</PRE>
<p><b>Notes:</b>
Beame&Whiteside's BWPCTCP shim only supports options 01h and 0Bh; all
others return CF clear.
V2.11 reportedly stores the actual 32-bit value of an option in DS:DX
rather than using a buffer in memory
<p><b>See Also:</b>
<a href="rb-6703.htm" tppabs="http://www.ctyme.com/intr/rb-6703.htm">INT 61"FTP Software"</a> - <a href="rb-6704.htm" tppabs="http://www.ctyme.com/intr/rb-6704.htm">INT 61/AH=00h"PC/TCP"</a> - <a href="rb-6859.htm" tppabs="http://www.ctyme.com/intr/rb-6859.htm">INT 61/AH=21h</a>
<PRE>
<p>
<a name=table3468></a>
(Table 03468)
Values for PC/TCP option to get or set:
01h set non-blocking mode if non-zero
02h timeout of call in milliseconds
03h user-defined 4-byte magic cookie (not used by kernel)
04h TCP window or UDP buffer count (WORD, unsigned)
06h do TCP keep-alives if non-zero
09h (v2.1+) set IP precedence
0Ah (v2.1+) set IP type of service
0Bh use a privileged port if port = 0
0Ch turn off TCP PUSH bit and don't flush buffer every write (see AH=1Ah)
</PRE>
<p><b>Note:</b>
Use "C" true or false values for boolean options
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