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AH = 3Fh BX = file handle CX = number of bytes to read DS:DX -> buffer for data
Return:
CF clear if successful AX = number of bytes actually read (0 if at EOF before call) CF set on error AX = error code (05h,06h) (see #01680 at AH=59h/BX=0000h)
Notes: Data is read beginning at current file position, and the file position is updated after a successful read. The returned AX may be smaller than the request in CX if a partial read occurred. If reading from CON, read stops at first CR. Under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
BUG: Novell NETX.EXE v3.26 and 3.31 do not set CF if the read fails due to a record lock (see AH=5Ch), though it does return AX=0005h; this has been documented by Novell
See Also: AH=27h - AH=40h - AH=93h - INT 2F/AX=1108h
Category: DOS Kernel - Int 21h - D
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