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-rw-r--r--ares_process.c29
1 files changed, 27 insertions, 2 deletions
diff --git a/ares_process.c b/ares_process.c
index 2a02f16..bbeca5e 100644
--- a/ares_process.c
+++ b/ares_process.c
@@ -1,6 +1,6 @@
/* Copyright 1998 by the Massachusetts Institute of Technology.
- * Copyright (C) 2004-2012 by Daniel Stenberg
+ * Copyright (C) 2004-2013 by Daniel Stenberg
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
@@ -640,6 +640,31 @@ static void process_broken_connections(ares_channel channel,
}
}
+/* Swap the contents of two lists */
+static void swap_lists(struct list_node* head_a,
+ struct list_node* head_b)
+{
+ int is_a_empty = ares__is_list_empty(head_a);
+ int is_b_empty = ares__is_list_empty(head_b);
+ struct list_node old_a = *head_a;
+ struct list_node old_b = *head_b;
+
+ if (is_a_empty) {
+ ares__init_list_head(head_b);
+ } else {
+ *head_b = old_a;
+ old_a.next->prev = head_b;
+ old_a.prev->next = head_b;
+ }
+ if (is_b_empty) {
+ ares__init_list_head(head_a);
+ } else {
+ *head_a = old_b;
+ old_b.next->prev = head_a;
+ old_b.prev->next = head_a;
+ }
+}
+
static void handle_error(ares_channel channel, int whichserver,
struct timeval *now)
{
@@ -660,7 +685,7 @@ static void handle_error(ares_channel channel, int whichserver,
* same server->queries_to_server list.
*/
ares__init_list_head(&list_head);
- ares__swap_lists(&list_head, &(server->queries_to_server));
+ swap_lists(&list_head, &(server->queries_to_server));
for (list_node = list_head.next; list_node != &list_head; )
{
query = list_node->data;