Note: This API call is for DOS and Win16 personality only. Use Family API for portability.

2018/09/07 05:04 · prokushev · 0 Comments

Int 21H, AH=41H


2 and higher



Family API


      AH = 41h
      DS:DX -> ASCIZ filename (no wildcards, but see notes)
      CL = attribute mask for deletion (server call only, see notes)


CF clear if successful

          AX destroyed (DOS 3.3) AL seems to be drive of deleted file
      CF set on error
          AX = error code (02h,03h,05h) (see #01680 at AH=59h/BX=0000h)


(DOS 3.1+) wildcards are allowed if invoked via AX=5D00h, in which case
        the filespec must be canonical (as returned by AH=60h), and only
        files matching the attribute mask in CL are deleted
      DR DOS 5.0-6.0 returns error code 03h if invoked via AX=5D00h; DR DOS
        3.41 crashes if called via AX=5D00h with wildcards
      DOS does not erase the file's data; it merely becomes inaccessible
        because the FAT chain for the file is cleared
      deleting a file which is currently open may lead to filesystem
        corruption.  Unless SHARE is loaded, DOS does not close the handles
        referencing the deleted file, thus allowing writes to a nonexistant
      under DR DOS and DR Multiuser DOS, this function will fail if the file
        is currently open
      under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
BUG:    DR DOS 3.41 crashes if called via AX=5D00h

See also

AH=13h,AX=4301h,AX=4380h,AX=5D00h,AH=60h,AX=7141h,AX=F244h, INT 2F/AX=1113h


2018/09/04 17:23 · prokushev · 0 Comments