SSF_GLOBAL
global_flags = (global_flags & ~SSF_UCHG) | (f & SSF_GLOBAL);
sc->flags = (sc->flags & ~SSF_UCHG) | (f & ~SSF_GLOBAL);
global_flags = (global_flags & ~SSF_UCHG) | (n & SSF_GLOBAL);
sc->flags = (sc->flags & ~SSF_UCHG) | (n & ~SSF_GLOBAL);