p_tpgid          1220 kern/kern_sysctl.c 	ki->p_tpgid = -1;	/* may be changed if controlling tty below */
p_tpgid          1236 kern/kern_sysctl.c 		ki->p_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : -1;
p_tpgid           374 sys/sysctl.h   	int32_t	p_tpgid;		/* PID_T: tty process group id */