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/* MIT License
*
* Copyright (c) 1998 Massachusetts Institute of Technology
* Copyright (c) The c-ares project and its contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
#include "ares_setup.h"
#include "ares.h"
#include "ares_private.h"
int ares_fds(ares_channel channel, fd_set *read_fds, fd_set *write_fds)
{
struct server_state *server;
ares_socket_t nfds;
size_t i;
/* Are there any active queries? */
size_t active_queries = ares__llist_len(channel->all_queries);
nfds = 0;
for (i = 0; i < channel->nservers; i++) {
ares__llist_node_t *node;
server = &channel->servers[i];
for (node = ares__llist_node_first(server->connections); node != NULL;
node = ares__llist_node_next(node)) {
const struct server_connection *conn = ares__llist_node_val(node);
/* We only need to register interest in UDP sockets if we have
* outstanding queries.
*/
if (active_queries || conn->is_tcp) {
FD_SET(conn->fd, read_fds);
if (conn->fd >= nfds) {
nfds = conn->fd + 1;
}
}
if (conn->is_tcp && ares__buf_len(server->tcp_send)) {
FD_SET(conn->fd, write_fds);
}
}
}
return nfds;
}
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