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====== Int 21H, AH=39H ======

===== Version =====

2 and higher

===== Brief =====

"MKDIR" - CREATE SUBDIRECTORY

===== Family API =====

[[en:docs:fapi:DosMkDir]]

===== Input =====

  * AH = 39h
  * DS:DX -> ASCIZ pathname (maximum length 67 or 260 characters)

===== Return =====

  * CF clear if successful
    * AX destroyed
  * CF set on error
    * AX = error code (03h,05h) (see #01680 at AH=59h/BX=0000h)

===== Notes =====

all directories in the given path except the last must exist fails if the parent directory is the root and is full
        
DOS 2.x-3.3 allow the creation of a directory sufficiently deep that it is not possible to make that directory the current directory because the path would exceed 64 characters

DOS 4+ checks for 67 path length (64 + driveletter + ':" + '\')

OS/2 2.0+ MVDM checks for 260 path length (257 + driveletter + ':" + '\')
          
under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
          
===== See also =====

AH=[[en:docs:dos:api:int21:3a|3Ah - Remove directory]],AH=[[en:docs:dos:api:int21:3b|3Bh - Change directory]],AH=[[en:docs:dos:api:int21:6d|6Dh]],AX=[[en:docs:dos:api:int21:71:39|7139h - LFN Create directory]],AX=[[en:docs:dos:api:int21:43:ff|43FFh - LFN (bare DOS) Create directory]]/BP=5053h
 INT 2F/AX=1103h

===== Note =====

Text based on [[http://www.cs.cmu.edu/~ralf/files.html|Ralf Brown Interrupt List Release 61]]

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