What happens in OS when we dereference a NULL pointer in C?

Question

Let\'s say there is a pointer and we initialize it with NULL.

int* ptr = NULL;
*ptr = 10;

Now , the program will crash since ptr

Answer 1

I imagine that this is platform and compiler dependent. The NULL pointer could be implemented by using a NULL page, in which case you'd have a page fault, or it could be below the segment limit for an expand-down segment, in which case you'd have a segmentation fault.

This is not a definitive answer, just my conjecture.