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_struct associated with the process through an ioctl call from the process so I have all the information contained in that at my disposal.

Note: the process I’m looking for is running in user space

Answer 1

Does this help:

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