bsd/kern/kern_proc.c

2496 			if (p->p_pgrpid != pgid) {
2541 	child->p_pgrpid = pgrp->pg_id;
2585 	p->p_pgrpid = PGRPID_DEAD;
2621 		(void)msleep(&p->p_pgrpid, proc_list_mlock, 0, "proc_pgrp", 0);
2634         p->p_pgrpid = PGRPID_DEAD;
2655         p->p_pgrpid = newpg->pg_id;
2684 		wakeup(&p->p_pgrpid);
2726 		(void)msleep(&p->p_pgrpid, proc_list_mlock, 0, "proc_pgrp", 0);
2775 		(void)msleep(&p->p_pgrpid, proc_list_mlock, 0, "proc_pgrp", 0);
2940 	return p->p_pgrpid;
2946 	return current_proc()->p_pgrpid;