73ef4ff3
 Hu Chunming
提交三方库
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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 "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_copy;
struct list_node* list_head;
struct list_node* list_node;
int i;
if (!ares__is_list_empty(&(channel->all_queries)))
{
/* Swap list heads, so that only those queries which were present on entry
* into this function are cancelled. New queries added by callbacks of
* queries being cancelled will not be cancelled themselves.
*/
list_head = &(channel->all_queries);
list_head_copy.prev = list_head->prev;
list_head_copy.next = list_head->next;
list_head_copy.prev->next = &list_head_copy;
list_head_copy.next->prev = &list_head_copy;
list_head->prev = list_head;
list_head->next = list_head;
for (list_node = list_head_copy.next; list_node != &list_head_copy; )
{
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);
}
}
if (!(channel->flags & ARES_FLAG_STAYOPEN) && ares__is_list_empty(&(channel->all_queries)))
{
if (channel->servers)
{
for (i = 0; i < channel->nservers; i++)
ares__close_sockets(channel, &channel->servers[i]);
}
}
}
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