EV_NSIG
#if defined EV_NSIG
static ANSIG signals [EV_NSIG - 1];
for (i = EV_NSIG - 1; i--; )
if (expect_false (signum <= 0 || signum >= EV_NSIG))
for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
for (i = 0; i < EV_NSIG - 1; ++i)