Write a C program that does the following:

1) Counts and prints the number of SIGINT signals received during the first 10 seconds of its life. (5 points)

2) "Blocks" the SIGINT signal once it reaches 10 seconds of its life. (5 points)

3) "Unblocks" and "Ignores" the SIGINT signal once it reaches 20 seconds of its life. (5 points)

4) Terminates after 30 seconds of life. (5 points)

Hints+Requirements:

1. To ignore a signal, you must modify its signal handler using sigaction().

2. To count the SIGINTs, you must install a signal handler for SIGINT using sigaction().

3. You can use alarm() to send yourself a SIGALRM signal after a specified number of seconds.

4. A signal can be waited upon using a signal handler + sigsuspend() OR using sigwait().

5. In order to block/unblock a signal, you must modify the signal mask using sigprocmask()