Symbol: PF_UNIX98
sys/kern/tty_pty.c
1146
if ((pti->pt_flags & PF_UNIX98) &&
sys/kern/tty_pty.c
214
pti->pt_flags = PF_UNIX98;
sys/kern/tty_pty.c
260
if ((pti->pt_flags & PF_UNIX98) == 0) {