Question

I need to get the stack information of my C application in certain points. I’ve read the documentation and searched the Net but still cannot figure out how I can do it. Can you point to a simple process explanation? Or, even better, to an example of stack unwinding. I need it for HP-UX (Itanium) and Linux.

Answer 1

Check out linux/stacktrace.h

Here is an API reference:

http://www.cs.cmu.edu/afs/cs/Web/People/tekkotsu/dox/StackTrace_8h.html

Should work on all Linux kernels

Here is an alternative example in C from

http://www.linuxjournal.com/article/6391

#include <stdio.h>
#include <signal.h>
#include <execinfo.h>

void show_stackframe() {
  void *trace[16];
  char **messages = (char **)NULL;
  int i, trace_size = 0;

  trace_size = backtrace(trace, 16);
  messages = backtrace_symbols(trace, trace_size);
  printf("[bt] Execution path:\n");
  for (i=0; i<trace_size; ++i)
    printf("[bt] %s\n", messages[i]);
}


int func_low(int p1, int p2) {

  p1 = p1 - p2;
  show_stackframe();

  return 2*p1;
}

int func_high(int p1, int p2) {

  p1 = p1 + p2;
  show_stackframe();

  return 2*p1;
}


int test(int p1) {
  int res;

  if (p1<10)
    res = 5+func_low(p1, 2*p1);
  else
    res = 5+func_high(p1, 2*p1);
  return res;
}



int main() {

  printf("First call: %d\n\n", test(27));
  printf("Second call: %d\n", test(4));

}