Part A-1

 

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <unistd.h>

 

void sighup();

void sigint();

void sigquit();

 

int  main()

{

   int pid;

 

   if ((pid = fork()) < 0)

   {

      perror("fork");

      exit(1);

   }

 

   if (pid == 0)

   {

      signal(SIGHUP, sighup);

      signal(SIGINT, sigint);

      signal(SIGQUIT, sigquit);

      for (;;)

          ;

   }

 

   else

   {

     printf("\nPARENT: sending SIGHUP\n\n");

     kill(pid, SIGHUP);

 

     sleep(3);

     printf("\nPARENT: sending SIGINT\n\n");

     kill(pid, SIGINT);

 

     sleep(3);

     printf("\nPARENT: sending SIGQUIT\n\n");

     kill(pid, SIGQUIT);

     sleep(3);

}

return(0);

}

 

 void sighup()

 

 {

    signal(SIGHUP, sighup);

    printf("CHILD: I have received a SIGHUP\n");

 }

 

 void sigint()

 {

 

signal(SIGINT, sigint);

    printf("CHILD: I have received a SIGINT\n");

 }

 

void sigquit()

{

    printf("My DADDY has killed me!!!\n");

    exit(0);

}