Guide to action client state ID numbers

edit

I believe that it's in the PREEMPTED state. According to the message definition found at the api:

GoalID goal_id
uint8 status
uint8 PENDING         = 0   # The goal has yet to be processed by the action server
uint8 ACTIVE          = 1   # The goal is currently being processed by the action server
uint8 PREEMPTED       = 2   # The goal received a cancel request after it started executing
                            #   and has since completed its execution (Terminal State)
uint8 SUCCEEDED       = 3   # The goal was achieved successfully by the action server (Terminal State)
... # edited for brevity

It's a constant. You can always find this sort of information out by running

$ rosmsg show actionlib_msgs/GoalState

but just change actionlib_msgs/GoalState with whatever message you're trying to examine.