Add support for sorting resolvers by priority

2 files changed, 15 insertions, 1 deletions

diff --git a/include/resolver.h b/include/resolver.h
index 77a95cf0..5c023758 100644
--- a/include/resolver.h
+++ b/include/resolver.h
@@ -32,8 +32,13 @@ extern "C" {
  * @short_description: Functions for registering resolver modules
  */
 
+#define CONNMAN_RESOLVER_PRIORITY_LOW      -100
+#define CONNMAN_RESOLVER_PRIORITY_DEFAULT     0
+#define CONNMAN_RESOLVER_PRIORITY_HIGH      100
+
 struct connman_resolver {
 	const char *name;
+	int priority;
 };
 
 extern int connman_resolver_register(struct connman_resolver *resolver);
diff --git a/src/resolver.c b/src/resolver.c
index 929fd2e5..a8132361 100644
--- a/src/resolver.c
+++ b/src/resolver.c
@@ -27,6 +27,14 @@
 
 static GSList *resolver_list = NULL;
 
+static gint compare_priority(gconstpointer a, gconstpointer b)
+{
+	const struct connman_resolver *resolver1 = a;
+	const struct connman_resolver *resolver2 = b;
+
+	return resolver2->priority - resolver1->priority;
+}
+
 /**
  * connman_resolver_register:
  * @resolver: resolver module
@@ -39,7 +47,8 @@ int connman_resolver_register(struct connman_resolver *resolver)
 {
 	DBG("resolver %p name %s", resolver, resolver->name);
 
-	resolver_list = g_slist_append(resolver_list, resolver);
+	resolver_list = g_slist_insert_sorted(resolver_list, resolver,
+							compare_priority);
 
 	return 0;
 }