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#include <signal.h>

char *foo;

void int_handler() {
  free(foo);
  _Exit(0);

/* _Exit() causes immediate program termination, and is
  async-safe, whereas exit() calls cleanup routines first, 
  and is not async-safe. */
}

int main(void) {
  foo = malloc(15);
  if(foo == NULL) {
    /* handle error condition */
    return 0;
  }
  signal(SIGINT, int_handler);
  strcpy(foo, "Hello World.");
  puts(foo);
  free(foo);
  return 0;
}