Index: src/xen_internal.c
===================================================================
RCS file: /data/cvs/libxen/src/xen_internal.c,v
retrieving revision 1.121
diff -u -p -r1.121 xen_internal.c
--- src/xen_internal.c	6 Jun 2008 11:09:57 -0000	1.121
+++ src/xen_internal.c	17 Jun 2008 09:48:17 -0000
@@ -2554,9 +2554,12 @@ xenHypervisorListDomains(virConnectPtr c
 
     priv = (xenUnifiedPrivatePtr) conn->privateData;
     if (priv->handle < 0 ||
-        (ids == NULL) || (maxids < 1))
+        (ids == NULL) || (maxids < 0))
         return (-1);
 
+    if (maxids == 0)
+        return(0);
+
     if (!(XEN_GETDOMAININFOLIST_ALLOC(dominfos, maxids))) {
         virXenError(conn, VIR_ERR_NO_MEMORY, "allocating %d domain info",
                     maxids);
Index: src/xend_internal.c
===================================================================
RCS file: /data/cvs/libxen/src/xend_internal.c,v
retrieving revision 1.198
diff -u -p -r1.198 xend_internal.c
--- src/xend_internal.c	9 Jun 2008 12:16:03 -0000	1.198
+++ src/xend_internal.c	17 Jun 2008 09:48:17 -0000
@@ -3330,7 +3330,10 @@ xenDaemonListDomains(virConnectPtr conn,
     struct sexpr *_for_i, *node;
     long id;
 
-    if ((ids == NULL) || (maxids <= 0))
+    if (maxids == 0)
+        return(0);
+
+    if ((ids == NULL) || (maxids < 0))
         goto error;
     root = sexpr_get(conn, "/xend/domain");
     if (root == NULL)
@@ -4219,8 +4222,11 @@ int xenDaemonListDefinedDomains(virConne
     if (priv->xendConfigVersion < 3)
         return(-1);
 
-    if ((names == NULL) || (maxnames <= 0))
+    if ((names == NULL) || (maxnames < 0))
         goto error;
+    if (maxnames == 0)
+        return(0);
+
     root = sexpr_get(conn, "/xend/domain?state=halted");
     if (root == NULL)
         goto error;