c - Print out value of stack pointer

Question

How can I print out the current value at the stack pointer in C in Linux (Debian and Ubuntu)?

I tried google but found no results.

Answer 1

One trick, which is not portable or really even guaranteed to work, is to simple print out the address of a local as a pointer.

void print_stack_pointer() {
  void* p = NULL;
  printf("%p", (void*)&p);
}

This will essentially print out the address of p which is a good approximation of the current stack pointer