How to send a signal to all process from child process?

Question

I 'm trying to do a socket programming example with using fork() call, my problem is: When a child process finished a job, i want to kill all other process. I think if i send a singal to others ... Is this possible or is any one tell me a way ?

Answer 1

At the start of the partent (before it forks its children), call setpgid(0,0) . This will get the Process Group ID to the the same as the parent's PID. This PGID will be inherited by each child and any of the processes can send a signal to all processes in the group by calling kill(signal, -getpgid(0)) .

Answer 2

An usual way of kill a process group is with killpg() system call. From man pages:

"killpg() sends the signal sig to the process group pgrp."

Along with killpg(), get/setpgid might be needed also to setup a group properly.

Answer 3

You can use this:

killpg( 0, SIGNALTYPE);

You can send signal to all childs.