SIGNATURE_CHECK (GNULIB_NAMESPACE::sigismember, int, (const sigset_t *, int));
SIGNATURE_CHECK (GNULIB_NAMESPACE::sigemptyset, int, (sigset_t *));
SIGNATURE_CHECK (GNULIB_NAMESPACE::sigaddset, int, (sigset_t *, int));
SIGNATURE_CHECK (GNULIB_NAMESPACE::sigismember, int, (const sigset_t *, int));
SIGNATURE_CHECK (GNULIB_NAMESPACE::sigemptyset, int, (sigset_t *));
SIGNATURE_CHECK (GNULIB_NAMESPACE::sigaddset, int, (sigset_t *, int));