diff --git a/lib/isc/unix/dir.c b/lib/isc/unix/dir.c
index 438ea6e0a2..8ac5a840f9 100644
--- a/lib/isc/unix/dir.c
+++ b/lib/isc/unix/dir.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: dir.c,v 1.15 2001/01/09 21:58:12 bwelling Exp $ */
+/* $Id: dir.c,v 1.16 2001/01/29 03:17:44 marka Exp $ */
 
 /* Principal Authors: DCL */
 
@@ -144,6 +144,17 @@ isc_dir_chdir(const char *dirname) {
 	return (ISC_R_SUCCESS);
 }
 
+isc_result_t
+isc_dir_chroot(const char *dirname) {
+
+	REQUIRE(dirname != NULL);
+
+	if (chroot(dirname) < 0)
+		return (isc__errno2result(errno));
+
+	return (ISC_R_SUCCESS);
+}
+
 isc_result_t
 isc_dir_createunique(char *templet) {
 	isc_result_t result;
diff --git a/lib/isc/unix/include/isc/dir.h b/lib/isc/unix/include/isc/dir.h
index 8cbc75f7fd..29b7618a8b 100644
--- a/lib/isc/unix/include/isc/dir.h
+++ b/lib/isc/unix/include/isc/dir.h
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: dir.h,v 1.12 2001/01/09 21:58:38 bwelling Exp $ */
+/* $Id: dir.h,v 1.13 2001/01/29 03:17:45 marka Exp $ */
 
 /* Principal Authors: DCL */
 
@@ -73,6 +73,9 @@ isc_dir_close(isc_dir_t *dir);
 isc_result_t
 isc_dir_chdir(const char *dirname);
 
+isc_result_t
+isc_dir_chroot(const char *dirname);
+
 isc_result_t
 isc_dir_createunique(char *templet);
 /*