NAME
        DeviceProc -- Return the process msgport of specific i/o handler

    SYNOPSIS
        process = DeviceProc( name )
        D0                    D1

        struct msgport *deviceproc (strptr)

    FUNCTION
        DeviceProc() returns the process identifier of the process which
        handles the device associated with the specified name. If no
        process handler can be found then the result is zero. If the name
        refers to an assign then a directory lock is returned in ioerr().
        This lock should not be UnLock()ed or Examine()ed (if you wish to do
        so, duplock() it first).

    BUGS
        In V36, if you try to DeviceProc() something relative to an assign
        made with assignpath(), it will fail.  this is because there's no
        way to know when to unlock the lock.  If you're writing code for
        V36 or later, it is highly advised you use getdeviceproc() instead,
        or make your code conditional on V36 to use GetDeviceProc()/
        freedeviceproc().

    SEE ALSO
        getdeviceproc(), freedeviceproc(), duplock(), unlock(), examine()