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AX = 716Ch BX = access mode and sharing flags (see #01782,also AX=6C00h) CX = attributes DX = action (see #01781) DS:SI -> ASCIZ filename DI = alias hint (number to append to short filename for disambiguation)
Return:
CF clear if successful AX = file handle CX = action taken 0001h file opened 0002h file created 0003h file replaced CF set on error AX = error code (see #01680) 7100h if function not supported
See Also: AX=6C00h - AX=7141h - AX=7156h - AX=71A9h
Bitfields for Windows95 long-name open action: Bit(s) Description (Table 01781) 0 open file (fail if file does not exist) 1 truncate file if it already exists (fail if file does not exist) 4 create new file if file does not already exist (fail if exists)
Note: The only valid combinations of multiple flags are bits 4&0 and 4&1
Bitfields for Windows95 file access/sharing modes: Bit(s) Description (Table 01782) 2-0 file access mode. 000 read-only. 001 write-only. 010 read-write. 100 read-only, do not modify file's last-access time 6-4 file sharing modes 7 no-inherit flag 8 do not buffer data (requires that all reads/writes be exact physical sectors) 9 do not compress file even if volume normally compresses files 10 use alias hint in DI as numeric tail for short-name alias 12-11 unused??? (0) 13 return error code instead of generating INT 24h if critical error while opening file 14 commit file after every write operation
See Also: #01402
Category: DOS Kernel - Int 21h - W
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