[svn-r12528] Added User-Defined links to the library.

Users can create external links using H5L_create_external().  These links
point to an object in another HDF5 file.  Users can alter the behavior of
external links or create new kinds of links by registering callbacks
using the H5L interface.

Added tests, tools support, etc.

Also a number of other, minor changes have been made (some restructuring of
the H5L interface, for instance).

Additional documentation and examples are forthcoming.

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/lib/h5tools_ref.c b/tools/lib/h5tools_ref.c
index f49cb07..5d6cfae 100644
--- a/tools/lib/h5tools_ref.c
+++ b/tools/lib/h5tools_ref.c
@@ -171,6 +171,12 @@ ref_path_table_lookup(const char *thepath)
         if(H5Gget_objinfo(thefile, thepath, TRUE, &sb)<0)
             /*  fatal error ? */
             return HADDR_UNDEF;
+    } else if(sb.type == H5G_UDLINK)
+    {
+        /* UD links can't be followed, so they always "dangle" like
+         * soft links.
+         */
+        return HADDR_UNDEF;
     } /* end if */
     objno = (haddr_t)sb.objno[0] | ((haddr_t)sb.objno[1] << (8 * sizeof(long)));