How can process become a member of a PGRP?
My attempt: Process needs to be a child of a PGRP's leader or we need to use a system call setpgid().
Also, another two questions.
1) How can process become a leader of a group? I can only think about creating a new process, which will automatically become a leader
2) Can group have many leaders? I think it is impossible, but can't find any information about this
Are my answers correct?