SA_ONSTACK
bsa->sa_flags |= SA_ONSTACK;
if (bsa->sa_flags & SA_ONSTACK)
act->sa_handler != SIG_IGN && (act->sa_flags & ~(SA_ONSTACK |
oact->sa_flags |= SA_ONSTACK;
if (sigact_flag_test(act, SA_ONSTACK))
#define SV_ONSTACK SA_ONSTACK
.sa_flags = SA_ONSTACK | SA_SIGINFO,
.sa_flags = SA_ONSTACK | SA_SIGINFO,
sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
X(SA_ONSTACK) X(SA_RESTART) X(SA_RESETHAND) X(SA_NOCLDSTOP)