Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Include:   <dos.h>, <errno.h>, <fcntl.h>, <share.h>
 
  Syntax:    unsigned _dos_open( char *filename, unsigned mode,
                                 int *handle );
             mode: O_NOINHERIT, O_RDONLY, O_RDWR, O_WRONLY, SH_COMPAT,
                   SH_DENYNO, SH_DENYRD, SH_DENYRW, SH_DENYWR
                   (may be joined by |)
 
  Returns:   0 if successful, or the DOS error code if not.
             errno: EACCES, EINVAL, EMFILE, ENOENT
 
  See also:  _dos_close, _dos_read, _dos_write
                                    -♦-