each process in this process group. See setpgid (2) for an explanation of orphaned process ... ALSO _exit (2), get_robust_list (2), setpgid (2), wait (2), atexit (3), on_exitfunctions are POSIX inventions. SEE ALSO setpgid (2), setsid (2), credentialsfunctions are POSIX inventions. SEE ALSO setpgid (2), setsid (2), credentialssched_setparam (2), sched_setscheduler (2), setpgid (2), setuid (2), sigaction (2), sigprocmask (2), posixsched_setparam (2), sched_setscheduler (2), setpgid (2), setuid (2), sigaction (2), sigprocmask (2), posix