SAS_NOCLDWAIT
if (pr->ps_pptr->ps_sigacts->ps_sigflags & SAS_NOCLDWAIT)
if ((ps->ps_sigflags & SAS_NOCLDWAIT) != 0)
atomic_setbits_int(&ps->ps_sigflags, SAS_NOCLDWAIT);
atomic_clearbits_int(&ps->ps_sigflags, SAS_NOCLDWAIT);
ps->ps_sigflags = SAS_NOCLDWAIT | SAS_NOCLDSTOP;
atomic_clearbits_int(&ps->ps_sigflags, SAS_NOCLDWAIT);