Kiling processes in C with Signals

Question

The main process in my program forks 3 more process with say process ids as pid1, pid2, pid3. Pid1 and pid2 processes are in infinite loop. What I want is when pid3 process is over all the process including the main are terminated. As of now, I am using :

wait(pid3);
kill(0, SIGKILL);

which do all above as i said, but it prints Killed on the terminal. I don't want the signal to display killed and infact nothing, but gracefully exits from the program. How can I do that?

Answer 1

Use SIGTERM instead, and install a signal handler that performs a clean exit (e.g. exit(0)) on receiving SIGTERM.

Answer 2

An alternate method is to set up a pipe() between the processes, and have the pid1 and pid2 processes exit when they see end-of-file on their pipe.