6437624 RFE: Add ksh93 (as /usr/bin/ksh93) and libshell.so to OS/Net

6505835 AST tools and library (libpp) required for creating l10n messages for ksh93
PSARC/2006/550 Korn Shell 93 Integration
PSARC/2006/587 /etc/ksh.kshrc for ksh93
PSARC/2007/035 ksh93 Amendments
Contributed by Roland Mainz <roland.mainz@nrubsig.org>

--HG--
rename : usr/src/lib/libcmd/common/mapfile-vers => deleted_files/usr/src/lib/libcmd/common/mapfile-vers
rename : usr/src/lib/libcmd/common/placeholder.c => deleted_files/usr/src/lib/libcmd/common/placeholder.c

1 files changed, 71 insertions, 0 deletions

diff --git a/usr/src/lib/libast/common/preroot/ispreroot.c b/usr/src/lib/libast/common/preroot/ispreroot.c
new file mode 100644
index 0000000000..540c42df50
--- /dev/null
+++ b/usr/src/lib/libast/common/preroot/ispreroot.c
@@ -0,0 +1,71 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
+*                      and is licensed under the                       *
+*                  Common Public License, Version 1.0                  *
+*                      by AT&T Knowledge Ventures                      *
+*                                                                      *
+*                A copy of the License is available at                 *
+*            http://www.opensource.org/licenses/cpl1.0.txt             *
+*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * AT&T Bell Laboratories
+ * return 1 if dir [any dir] is the preroot
+ */
+
+#include <ast.h>
+#include <preroot.h>
+
+#if FS_PREROOT
+
+#include <ls.h>
+
+/*
+ * return 1 if files a and b are the same under preroot
+ *
+ * NOTE: the kernel disables preroot for set-uid processes
+ */
+
+static int
+same(const char* a, const char* b)
+{
+	int		i;
+	int		euid;
+	int		ruid;
+
+	struct stat	ast;
+	struct stat	bst;
+
+	if ((ruid = getuid()) != (euid = geteuid())) setuid(ruid);
+	i = !stat(a, &ast) && !stat(b, &bst) && ast.st_dev == bst.st_dev && ast.st_ino == bst.st_ino;
+	if (ruid != euid) setuid(euid);
+	return(i);
+}
+
+int
+ispreroot(const char* dir)
+{
+	static int	prerooted = -1;
+
+	if (dir) return(same("/", dir));
+	if (prerooted < 0) prerooted = !same("/", PR_REAL);
+	return(prerooted);
+}
+
+#else
+
+NoN(ispreroot)
+
+#endif