S_ISBLK          633 file.c             if (S_ISBLK(st.st_mode)) return Qtrue;
S_ISBLK          866 file.c             else if (S_ISBLK(st->st_mode)) {
S_ISBLK          2103 file.c             if (S_ISBLK(get_stat(obj)->st_mode)) return Qtrue;