use signals to interacting with processes.

write a C program sig.c that, when invoked, waits for input from the user and echoes it back line-by-line (this is the default behavior). This program should execute on a Linux machine, and should be compiled with gcc. While echoing inputs, the program should also listen for several signals. Receipt of each signal should cause a different response from the program.

First, your program should schedule a SIGALRM (alarm) every ten seconds, and react to this signal by counting up seconds, by printing something like the following:

tick 0... 

tick 10... 

tick 20...

as a running count. This will serve as a "heartbeat" to let you know that your program has not crashed.

Second, the following signals should evoke behaviors as indicated:

SIGINT should print a summary of all time spent by the program (system and user) and then continue running the program.

SIGTERM should print a summary of all time spent in the program, and additionally exit the program

SIGTSTP should print the last 10 lines of user input.

(Hints:

Some documentation exists that may help you. For example;

man signal - how to set up a signal handler.

man sigvec - another way to set up a signal handler.

man sleep - how to use SIGALRM to sleep for a given number of seconds.)

The whole program should be in a single c program sig.c. Programs in other languages are unacceptable. The beginning of the file should describe how to compile the file, in comments.

(A typical compilation command might be: gcc -o sig sig.c)

implement the above using only one signal handler