S_ISUID            41 gnulib-tests/test-sys_stat.c     S_ISUID, S_ISGID, S_ISVTX,
S_ISUID           271 gnulib-tests/test-sys_stat.c verify (S_ISUID == 04000);
S_ISUID             3 lib/stat-macros.h   (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
S_ISUID           222 lib/sys_stat.in.h #if !S_ISUID