NOTE_PDSIGCHLD
X(NOTE_EXIT) X(NOTE_FORK) X(NOTE_EXEC) X(NOTE_PDSIGCHLD) X(NOTE_REAP)
KNOTE_LOCKED(&pd->pd_selinfo.si_note, NOTE_EXIT | NOTE_PDSIGCHLD);
KNOTE_LOCKED(&pd->pd_selinfo.si_note, NOTE_PDSIGCHLD);
event = NOTE_EXIT | NOTE_PDSIGCHLD;
event = NOTE_PDSIGCHLD;