1. /* signal_base.c */

2. #include

3. #include

4. #include

5. #include

6.

7. void handler(int signum) //signal handler

8. { printf("Hello World! ");

9. exit(1); //exit after printing

10. }

11.

12. int main(int argc, char * argv[])

13. { signal(SIGALRM,handler); //register handler to handle SIGALRM

14. alarm(1); //Schedule a SIGALRM for 1 second

15. while(1) sleep(5); //waiting for signal to be delivered 16. return 0; //never reached

17. }

Signal Handling Programming Problems Program the solutions to the following problems by extending signal_base.c: 1. Change signal_base.c such that after the handler is invoked, an additional printf("Turing was right! ") occurs in main() before exiting. You will probably need to use a global variable and change the condition on the while loop. Furthermore, change signal_base.c such that every second, first Hello World! prints from the signal handler followed by Turing was right! in main(), over and over again indefinitely. The output should look like: Hello World! Turing was right! Hello World! Turing was Right!