  Using the null-geodesic tunneling method of Parikh and Wilczek, we derive the
Hawking temperature of a general four-dimensional rotating black hole. In order
to eliminate the motion of $\phi$ degree of freedom of a tunneling particle, we
have chosen a reference system that is co-rotating with the black hole horizon.
Then we give the explicit result for the Hawking temperature of the
Kerr-Newman-AdS black hole from the tunneling approach.
