example: kill (2), ptrace (2), setpriority (2), setpgid (2), setsid (2), sigqueue (3), and waitpid ... group membership can be set using setpgid (2). The process whose processsendmsg (2) sendto (2) setgid (2) setpgid (2) setsid (2) setsockopt (2) setuid (2) shutdowncontrol, and the following functions are present: setpgid () tcdrain () tcflush () tcgetpgrp () tcsendbreak () tcsetattr () tcsetpgrpprocess into a process group leader using setpgid (2) (fixed in Linux 2.6.16). • Threads have