how to print backtrace in C, remember add gcc option '-rdynamic' when compile

backtrace example

#include <execinfo.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>

#define BACKTRACE_SIZE 256

static void
handle_segfault(int sig)
{
  void *func[BACKTRACE_SIZE];
  char **symb = NULL;
  int size;

  printf("======================================================================\n");
  printf(" Segmentation fault: please post this backtrace to:\n");
  printf(" rongyi@ucloud.cn\n");
  printf("======================================================================\n");
  size = backtrace(func, BACKTRACE_SIZE);
  symb = backtrace_symbols(func, size);
  char exe_name[512] = {};
  readlink("/proc/self/exe", exe_name, sizeof(exe_name));
  while (size > 0) {
    const char *symbol = symb[size - 1];
    char foo[1024];
    printf("%d: [%s]\n", size, symbol);
    if (strstr(symbol, "[0x")) {
      char *p = strstr(symbol, "[0x") + 1;
      char *pp = strchr(p, ']');

      snprintf(foo, sizeof(foo), "addr2line -p -i -f -e %s %.*s",
          exe_name,
          (unsigned)(pp-p),
          p);
      if (system(foo) == -1)
        printf("(addr2line missing)\n");
    }
    size --;
  }
  exit(1);
  return;
}

int main()
{
  signal(SIGSEGV, handle_segfault);
  char *c = NULL;
  *c = 'c';
  return 0;
}