2009-09-13  Samuel Thibault  <samuel.thibault@ens-lyon.org>

        * hurd/hurdchdir.c (_hurd_change_directory_port_from_name):
        Return ENOENT when name is empty.
        * sysdeps/mach/hurd/chroot.c (chroot): Return ENOENT when path
        is empty.

---
 hurd/hurdchdir.c           |    6 ++++++
 sysdeps/mach/hurd/chroot.c |    6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/hurd/hurdchdir.c b/hurd/hurdchdir.c
index 5115e4d..b1cc7a5 100644
--- a/hurd/hurdchdir.c
+++ b/hurd/hurdchdir.c
@@ -38,6 +38,12 @@ _hurd_change_directory_port_from_name (struct hurd_port *portcell,
   len = strlen (name);
   if (len >= 2 && name[len - 2] == '/' && name[len - 1] == '.')
     lookup = name;
+  else if (len == 0)
+    {
+      /* Special-case null pathname according to POSIX */
+      errno = ENOENT;
+      return -1;
+    }
   else
     {
       char *n = alloca (len + 3);
diff --git a/sysdeps/mach/hurd/chroot.c b/sysdeps/mach/hurd/chroot.c
index fde0164..cabeb7d 100644
--- a/sysdeps/mach/hurd/chroot.c
+++ b/sysdeps/mach/hurd/chroot.c
@@ -38,6 +38,12 @@ chroot (const char *path)
   len = strlen (path);
   if (len >= 2 && path[len - 2] == '/' && path[len - 1] == '.')
     lookup = path;
+  else if (len == 0)
+    {
+      /* Special-case null pathname according to POSIX */
+      errno = ENOENT;
+      return -1;
+    }
   else
     {
       char *n = alloca (len + 3);