Capturing SIGSEGV

sigsegv.c

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

static void sig_debug(int sig)
{
  FILE*  file;
  char   filename[256];

  void*  bt[200];
  int    bt_size, i;
  char** bt_symbols;

  fprintf(stderr, "Segmentation fault\n");
  fflush(stderr);

  bt_size = backtrace(bt, 200);
  file = fopen("backtrace.log", "w");
  if(!file) exit(255);

  bt_symbols = backtrace_symbols(bt, bt_size);
  for(i=0; i<bt_size; i++) {
    fprintf(file, "%s\n", bt_symbols[i]);
  }

  fclose(file);
  free(bt_symbols);
  exit(255);
}

int main(int argc, char** argv)
{
  signal(SIGSEGV, sig_debug);
  ...
}