Signal Handling in C $ gcc -Wall -Werror -pedantic -o signal signal.c

signal.c

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

#ifndef ACTION
#define ACTION SIGSEGV
#endif

void action(int signo, siginfo_t *info, void *ptr);

int
main(void)
{
  struct sigaction action_n, action_o;

  /* setup new handler for action */
  action_n.sa_sigaction = action;
  sigemptyset(&action_n.sa_mask);
  action_n.sa_flags = SA_SIGINFO;

  /* get the old handler for action */
  sigaction(ACTION, NULL, &action_o);
  /* if this is not to be ignored ... */
  if(action_o.sa_handler != SIG_IGN)
    /* use our new one for the action */
    sigaction(ACTION, &action_n, NULL);

  /* raise the action to *
   * call the handler    */
  raise(ACTION);

  return 0;
}

void
action(int signo, siginfo_t *info, void *ptr)
{
#ifdef __GNUC__
  size_t size;
  void *stack[10];
#endif

  /* string representation of the signal */
  fprintf(stderr, "%s\n", strsignal(signo));

#ifdef __GNUC__
  /* get the trace and then print it to stderr */
  size = backtrace(stack, 10);
  backtrace_symbols_fd(stack, size, STDERR_FILENO);
#endif
}