Hi tamir,
The Interrupt pins are the same as Arduino Uno, 2 and 3 stated in the Galileo IO Mapping Document here: https://communities.intel.com/docs/DOC-21920. The example used above by MichaelJacobsen does not work because according to the Release Notes found here: https://communities.intel.com/docs/DOC-21837, attachInterrupt HIGH/LOW triggering mode is not supported.
Regards,
Intel_Jesus