MF_APPEND
map->map_mflags |= MF_APPEND;
if (!bitset(MF_APPEND, map->map_mflags))
map->map_mflags |= MF_APPEND;
if (!bitset(MF_APPEND, map->map_mflags))
map->map_mflags |= MF_APPEND;
map->map_mflags |= MF_APPEND;