[ غير ذلك ] بليز الا يعرف لنظام linux
 

Your objective is to write a C program sig.c that, when invoked, waits for input from the user and echoes it back line-by-line

While echoing inputs, your 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:

1. SIGINT should print a summary of all time spent by the program (system and user) and then continue running the program.
2. SIGTERM should print a summary of all time spent in the program, and additionally exit the program
3. SI
4. GTSTP should print the last 10 lines of user input.




Hints

Some documentation pointers

• 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.



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implement the above using only one signal handler routine to catch all kinds of signals.