setpgid
setpgid(0, rootpid);
setpgid(0, initialpgrp);
if (setpgid(0, pgrp) == 0 && mode == FORK_FG &&
setpgid(pid, pgrp);
setpgid(0, getpid());
setpgid(0, 0);
if(setpgid(0, pgrp) < 0)
setpgid(0, 0);
if (setpgid(0, 0)) {
int setpgid(pid_t, pid_t);
return(setpgid(pid, pgid));
if (setpgid(0, sa->sa_pgroup) != 0)
setpgid(child_pid, child_pid);
error = setpgid(0, pgid);
setpgid((pid_t)0, printpid);