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

void
termination_handler (int signum)
{
  struct temp_file *p;
  FILE* f=fopen("log.txt","a");
  fprintf(f,"Note: Values of signal: SIGINT:%d\t SIGTSTP:%d\t SIGTERM:%d\n", SIGINT, SIGTSTP,SIGTERM);
  fprintf(f,"Received signal:%d\n", signum);
  fclose(f);
}

int main (void)
{
 
  printf("Begin of program\n");
  
  signal(SIGINT, termination_handler);  // Ctrl+C for generating the signal
  signal(SIGTSTP, termination_handler); // Ctrl+Z for generating the signal
 while (1) {}
}