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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 61"FTP Software")
Notes: 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
See Also: INT 61"FTP Software" - INT 61/AH=00h"PC/TCP" - INT 61/AH=21h
(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)
Note: Use "C" true or false values for boolean options
Category: Network - Int 61h - P
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