#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <stdarg.h>
#include <errno.h>

#define MAXS 256

void sigPrintf(const char *format, ...) {
  char buf[MAXS];
  va_list args;

  va_start(args, format);                     /* reentrant */
  vsnprintf(buf, sizeof(buf), format, args);  /* reentrant */
  va_end(args);                               /* reentrant */
  write(1, buf, strlen(buf));                 /* async-signal-safe */
}

void errExit(char * s)
{
  perror(s);
  exit(1);
}

static void
sigHandler(int sig)
{
  static int count = 0;
  if (sig == SIGINT) {
    count++;
    sigPrintf("Caught SIGINT (%d)\n", count);
    return; /* Resume execution at point of interruption */ }
  /* Must be SIGQUIT - print a message and terminate the process */
  sigPrintf("Caught SIGQUIT - that's all folks!\n");
  exit(EXIT_SUCCESS);
}

int
main(int argc, char *argv[])
{
  int i = 0;
  /* Establish same handler for SIGINT and SIGQUIT */
  if (signal(SIGINT, sigHandler) == SIG_ERR) errExit("signal");
  if (signal(SIGQUIT, sigHandler) == SIG_ERR) errExit("signal");
  //if (signal(SIGKILL, sigHandler) == SIG_ERR) errExit("signal");
  for (;;) /* Loop forever, waiting for signals */ 
    i = i + 1;
    //pause(); /* Block until a signal is caught */
}