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authorAnas Nashif <anas.nashif@intel.com>2012-10-30 20:54:38 (GMT)
committerAnas Nashif <anas.nashif@intel.com>2012-10-30 20:54:38 (GMT)
commitb8e6c26b7b9608dffc84645f17fe4cf534af18dd (patch)
tree61d9fff2984aa043471a1c305cfc4c76d7a099fb /ares_cancel.c
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Imported Upstream version 1.7.5upstream/1.7.5
Diffstat (limited to 'ares_cancel.c')
-rw-r--r--ares_cancel.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/ares_cancel.c b/ares_cancel.c
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+
+/* Copyright (C) 2004 by Daniel Stenberg et al
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose and without fee is hereby granted, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. M.I.T. makes no representations about the
+ * suitability of this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ */
+
+#include "ares_setup.h"
+#include <assert.h>
+#include <stdlib.h>
+#include "ares.h"
+#include "ares_private.h"
+
+/*
+ * ares_cancel() cancels all ongoing requests/resolves that might be going on
+ * on the given channel. It does NOT kill the channel, use ares_destroy() for
+ * that.
+ */
+void ares_cancel(ares_channel channel)
+{
+ struct query *query;
+ struct list_node* list_head;
+ struct list_node* list_node;
+ int i;
+
+ list_head = &(channel->all_queries);
+ for (list_node = list_head->next; list_node != list_head; )
+ {
+ query = list_node->data;
+ list_node = list_node->next; /* since we're deleting the query */
+ query->callback(query->arg, ARES_ECANCELLED, 0, NULL, 0);
+ ares__free_query(query);
+ }
+#ifndef NDEBUG
+ /* Freeing the query should remove it from all the lists in which it sits,
+ * so all query lists should be empty now.
+ */
+ assert(ares__is_list_empty(&(channel->all_queries)));
+ for (i = 0; i < ARES_QID_TABLE_SIZE; i++)
+ {
+ assert(ares__is_list_empty(&(channel->queries_by_qid[i])));
+ }
+ for (i = 0; i < ARES_TIMEOUT_TABLE_SIZE; i++)
+ {
+ assert(ares__is_list_empty(&(channel->queries_by_timeout[i])));
+ }
+#endif
+ if (!(channel->flags & ARES_FLAG_STAYOPEN))
+ {
+ if (channel->servers)
+ {
+ for (i = 0; i < channel->nservers; i++)
+ ares__close_sockets(channel, &channel->servers[i]);
+ }
+ }
+}