* virt-top/virt_top.ml: Ignore transient error from

[virt-top.git] / virt-top / virt_top.ml

diff --git a/virt-top/virt_top.ml b/virt-top/virt_top.ml
index 7a041b2..a621a18 100644 (file)
--- a/virt-top/virt_top.ml
+++ b/virt-top/virt_top.ml
@@ -439,7 +439,9 @@ let redraw, clear_pcpu_display_data =
     let doms =
       (* Active domains. *)
       let n = C.num_of_domains conn in
-      let ids = Array.to_list (C.list_domains conn n) in
+      let ids =
+       if n > 0 then Array.to_list (C.list_domains conn n)
+       else [] in
       let doms =
        List.filter_map (
          fun id ->
@@ -484,9 +486,18 @@ let redraw, clear_pcpu_display_data =
        ) ids in
 
       (* Inactive domains. *)
-      let n = C.num_of_defined_domains conn in
-      let names = Array.to_list (C.list_defined_domains conn n) in
-      let doms_inactive = List.map (fun name -> name, Inactive) names in
+      let doms_inactive =
+       try
+         let n = C.num_of_defined_domains conn in
+         let names =
+           if n > 0 then Array.to_list (C.list_defined_domains conn n)
+           else [] in
+         List.map (fun name -> name, Inactive) names
+       with
+         (* Ignore transient errors, in particular errors from
+          * num_of_defined_domains if it cannot contact xend.
+          *)
+       | Libvirt.Virterror _ -> [] in
 
       doms @ doms_inactive in