sigaddset         219 maint/gnulib/lib/signal.in.h # undef sigaddset
sigaddset         255 maint/gnulib/lib/signal.in.h #   undef sigaddset
sigaddset         356 maint/gnulib/lib/signal.in.h # undef sigaddset
sigaddset         137 maint/gnulib/lib/sigprocmask.c sigaddset (sigset_t *set, int sig)