ibcs2_sigmask      56 compat/ibcs2/ibcs2_signal.c #define ibcs2_sigismember(s, n)	(*(s) & ibcs2_sigmask(n))
ibcs2_sigmask      57 compat/ibcs2/ibcs2_signal.c #define ibcs2_sigaddset(s, n)	(*(s) |= ibcs2_sigmask(n))