From NetBSD (christos) [fixed typo introduced in comment]:

    If ``who'' was not specified, set the appropriate bits as the manual
    page states.  ``chmod +s foo''  and ``chmod +t dir'' now work.

diff --git a/lib/libc/gen/setmode.c b/lib/libc/gen/setmode.c
index 7a19512..bbf5053 100644 (file)
--- a/lib/libc/gen/setmode.c
+++ b/lib/libc/gen/setmode.c
@@ -1,3 +1,6 @@
+/*     $OpenBSD: setmode.c,v 1.5 1997/03/07 02:15:18 millert Exp $     */
+/*     $NetBSD: setmode.c,v 1.15 1997/02/07 22:21:06 christos Exp $    */
+
 /*
  * Copyright (c) 1989, 1993, 1994
  *     The Regents of the University of California.  All rights reserved.
@@ -35,7 +38,11 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: setmode.c,v 1.4 1996/08/19 08:25:55 tholo Exp $";
+#if 0
+static char sccsid[] = "@(#)setmode.c  8.2 (Berkeley) 3/25/94";
+#else
+static char rcsid[] = "$OpenBSD: setmode.c,v 1.5 1997/03/07 02:15:18 millert Exp $";
+#endif
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
@@ -87,10 +94,10 @@ getmode(bbox, omode)
        mode_t omode;
 #endif
 {
-       register BITCMD *set;
+       register const BITCMD *set;
        register mode_t clrval, newmode, value;
 
-       set = (BITCMD *)bbox;
+       set = (const BITCMD *)bbox;
        newmode = omode;
        for (value = 0;; set++)
                switch(set->cmd) {
@@ -258,13 +265,19 @@ getop:            if ((op = *p++) != '+' && op != '-' && op != '=') {
                                perm |= S_IRUSR|S_IRGRP|S_IROTH;
                                break;
                        case 's':
-                               /* If only "other" bits ignore set-id. */
-                               if (who & ~S_IRWXO)
+                               /*
+                                * If specific bits where requested and
+                                * only "other" bits ignore set-id.
+                                */
+                               if (who == 0 || (who & ~S_IRWXO))
                                        perm |= S_ISUID|S_ISGID;
                                break;
                        case 't':
-                               /* If only "other" bits ignore sticky. */
-                               if (who & ~S_IRWXO) {
+                               /*
+                                * If specific bits where requested and
+                                * only "other" bits ignore sticky.
+                                */
+                               if (who == 0 || (who & ~S_IRWXO)) {
                                        who |= S_ISTXT;
                                        perm |= S_ISTXT;
                                }
@@ -403,7 +416,7 @@ dumpmode(set)
 /*
  * Given an array of bitcmd structures, compress by compacting consecutive
  * '+', '-' and 'X' commands into at most 3 commands, one of each.  The 'u',
- * 'g' and 'o' commands continue to be separate.  They could probably be 
+ * 'g' and 'o' commands continue to be separate.  They could probably be
  * compacted, but it's not worth the effort.
  */
 static void