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

 void end(int signo)
 {
   printf("\n\nInterrupt from keyboard!\n");
   exit(0);
 }

 int main()
 {
   /* signal -- SIGINT -- handling */
   signal(SIGINT, end);

   /* infinite loop */
   while(1);
 }

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

 int end = 0;

 void sigservice(int signo)
 {
   printf("Signal!\nEND!\n");
   end = 1;
   exit(0);
 }

 int main()
 {
   int pid;
   if ((pid=fork()) == 0)
   {
     /* signal -- SIGINT -- handling */
     signal(SIGINT, sigservice);

     while(end == 0);
   }
   printf("Waiting...\n");
   sleep(5);
   printf("Sending signal no 2 to the child process [PID=%d]\n", pid);
   kill(pid, 2);
 }