[glib] GThreadedResolver: set an error if no records could be found

[Giovanni Campagna <gcampagna src gnome org>]

commit 3456152f23a9507f10c868ff4bc1cca91a486b21
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Fri Mar 29 15:39:26 2013 +0100

    GThreadedResolver: set an error if no records could be found
    
    It is possible that the upstream servers return something, but
    we then filter all results because they are of the wrong type.
    In that case the API and subsequent GTask calls expect a GError
    to be set.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=696857

 gio/gthreadedresolver.c |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)
---
diff --git a/gio/gthreadedresolver.c b/gio/gthreadedresolver.c
index def85b8..2332adf 100644
--- a/gio/gthreadedresolver.c
+++ b/gio/gthreadedresolver.c
@@ -472,6 +472,14 @@ g_resolver_records_from_res_query (const gchar      *rrname,
         records = g_list_prepend (records, record);
     }
 
+  if (records == NULL)
+    {
+      g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
+                   _("No DNS record of the requested type for '%s'"), rrname);
+
+      return NULL;
+    }
+  else
     return records;
 }
 
@@ -616,7 +624,15 @@ g_resolver_records_from_DnsQuery (const gchar  *rrname,
         records = g_list_prepend (records, g_variant_ref_sink (record));
     }
 
-  return records;
+  if (records == NULL)
+    {
+      g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
+                   _("No DNS record of the requested type for '%s'"), rrname);
+
+      return NULL;
+    }
+  else
+    return records;
 }
 
 #endif