delete _field.

    - I make a mistake for using _field_(Structure), I write _filed_ to _field. In fact, I don't need Structure.
{RRIP} support making device file.
    - Need permission to running, or can't make device file.

Added return status.
    -  0  : success.
    - -1  : failure.
    - -2  : can't make non-regular file(device file, socket, fifo).
    - -3  : can't open file.