Index: realpath.1
===================================================================
RCS file: /usr/repo/src/bin/realpath/realpath.1,v
retrieving revision 1.10
diff -u -p -r1.10 realpath.1
--- realpath.1	16 Jan 2005 16:41:58 -0000	1.10
+++ realpath.1	13 Jan 2007 10:06:33 -0000
@@ -33,7 +33,7 @@
 .\" From: src/bin/pwd/pwd.1,v 1.11 2000/11/20 11:39:39 ru Exp
 .\" $FreeBSD: src/bin/realpath/realpath.1,v 1.10 2005/01/16 16:41:58 ru Exp $
 .\"
-.Dd November 24, 2000
+.Dd January 11, 2006
 .Dt REALPATH 1
 .Os
 .Sh NAME
@@ -41,6 +41,7 @@
 .Nd return resolved physical path
 .Sh SYNOPSIS
 .Nm
+.Op Fl c chpath
 .Ar path
 .Sh DESCRIPTION
 The
@@ -55,9 +56,21 @@ and
 .Pa /../
 in
 .Ar path .
+If the
+.Fl c
+option is given, the
+.Nm
+utility will
+.Xr chroot 2
+to the
+.Ar chpath
+directory before resolving
+.Ar path .
 .Sh EXIT STATUS
 .Ex -std
 .Sh SEE ALSO
+.Xr chroot 1 ,
+.Xr chroot 2 ,
 .Xr realpath 3
 .Sh HISTORY
 The
Index: realpath.c
===================================================================
RCS file: /usr/repo/src/bin/realpath/realpath.c,v
retrieving revision 1.6
diff -u -p -r1.6 realpath.c
--- realpath.c	6 Apr 2004 20:06:50 -0000	1.6
+++ realpath.c	11 Jan 2007 19:37:29 -0000
@@ -43,13 +43,30 @@ int
 main(int argc, char *argv[])
 {
 	char buf[PATH_MAX];
-	char *p;
+	char *p, *chpath;
+	int ch;
 
-	if (argc == 2) {
-		if ((p = realpath(argv[1], buf)) == NULL)
-			err(1, "%s", buf);
-	} else
+	chpath = NULL;
+	while ((ch = getopt(argc, argv, "c:")) != -1) {
+		switch ((char)ch) {
+		case 'c':
+			chpath = optarg;
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc != 1)
 		usage();
+
+	if (chpath != NULL && chroot(chpath) == -1)
+		err(1, "chroot(%s)", chpath);
+	if ((p = realpath(argv[0], buf)) == NULL)
+		err(1, "%s", buf);
 	(void)printf("%s\n", p);
 	exit(0);
 }