How can I check if a process is still running from the kernel in c?

Question

All the answers I\'ve seen so far appear to just be checking within user space. I need a way to check from kernel space specifically within a device driver. I get the task_struc

Answer 1

Does this help:

struct task_struct { 
   volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
   ...
}