Int 2F/AX=122Ah

DOS 3.3+ internal - SET FASTOPEN ENTRY POINT

AX = 122Ah
BX = entry point to set (0001h or 0002h)
DS:SI -> FASTOPEN entry point (see #02611,#02612)
(entry point not set if SI = FFFFh for DOS 4.0+)

Return:
CF set if specified entry point already set

Notes: Entry point in BX is ignored under DOS 3.30. Both entry points set to same handler by DOS 4.01. DOS 5.0 and 6.0 only set entry point 1



(Table 02611)
Values DOS 3.30+ FASTOPEN entry point is called with:.
AL = 01h  Lookup
CX = ??? seems to be offset
DI = ??? seems to be offset
SI = offset in DOS DS of filename.
AL = 02h  insert file into FASTOPEN cache.
AL = 03h  delete file from FASTOPEN cache
SI = offset in DOS DS of filename.
AL = 04h  purge FASTOPEN cache
AH = subfunction (00h,01h,02h)
ES:DI -> ???
CX = ??? (subfunctions 01h and 02h only)
Returns:
CF set on error or not installed

Note: Function 03h calls function 01h first

See Also: #02612 - #02613



(Table 02612)
Values PC-DOS 4.01 FASTOPEN is additionally called with:.
AL = 04h ???
AH = 03h
???.
AL = 05h ???.
AL = 0Bh ???.
AL = 0Ch ???.
AL = 0Dh ???.
AL = 0Eh ???.
AL = 0Fh ???.
AL = 10h ???

See Also: #02611 - #02613



(Table 02613)
Values MS-DOS 5.0-6.0 FASTOPEN is additionally called with:.
AL = 04h  purge FASTOPEN cache
AH = 03h
???.
AL = 05h ???
DL = drive (00h = A:)
???.
AL = 06h ???
???

See Also: #02611 - #02612

Category: DOS Kernel - Int 2Fh - D

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