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_get_dev_info
=============

Syntax
------

     #include <io.h>
     
     short _get_dev_info(int arg);

Description
-----------

Given drive_number (A: = 0, B: = 1, etc.) or a file handle in ARG, this
function returns the device info word which is returned by DOS IOCTL
function 0 (Int 21h/AX=4400h).  In case of error, -1 is returned and
ERRNO is set.