NAME
        GetDeviceProc -- Finds a handler to send a message to (V36)

   SYNOPSIS
        devproc = GetDeviceProc(name, devproc)
          D0                     D1     D2

        struct devproc *getdeviceproc(strptr, struct devproc *)

   FUNCTION
        Finds the handler/filesystem to send packets regarding 'name' to.
        This may involve getting temporary locks.  It returns a structure
        that includes a lock and msgport to send to to attempt your operation.
        It also includes information on how to handle multiple-directory
        assigns (by passing the devproc back to getdeviceproc() until it
        returns NULL).

        The initial call to GetDeviceProc() should pass NULL for devproc.  If
        after using the returned devproc, you get an error_object_not_found,
        and (devproc->dvp_Flags & DVPF_ASSIGN) is true, you should call
        GetDeviceProc() again, passing it the devproc structure.  It will
        either return a modified devproc structure, or NULL (with
        ERROR_NO_MORE_ENTRIES in IoErr()).  Continue until it returns NULL.

        This call also increments the counter that locks a handler/fs into
        memory.  After calling freedeviceproc(), do not use the port or lock
        again!

   INPUTS
        name    - name of the object you wish to access.  This can be a
                  relative path ("foo/bar"), relative to the current volume
                  (":foo/bar"), or relative to a device/volume/assign
                  ("foo:bar").
        devproc - A value returned by GetDeviceProc() before, or NULL

   RESULT
        devproc - a pointer to a devproc structure or null

   BUGS
        Counter not currently active in 2.0.
        In 2.0 and 2.01, you HAD to check DVPF_ASSIGN before calling it again.
        This was fixed for the 2.02 release of V36.

   SEE ALSO
        freedeviceproc(), deviceproc(), assignlock(), assignlate(),
        assignpath()