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     The _dos_getfileattr routine uses system call 0x43 to obtain the
     current attributes of the file or directory pointed to by
     <pathname>. The attributes are copied to the low-order byte of the
     <attrib> word. Attributes are represented by the following
     manifest constants:
 
     _A_ARCH       _A_NORMAL     _A_SYSTEM
     _A_HIDDEN     _A_RDONLY
 
     Return Value
 
     If successful, the function returns 0. Otherwise, it returns the
     DOS error code and sets errno to ENOENT, indicating that the
     target file or directory could not be found.
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