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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"
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#include "ares.h"
#include "ares_private.h"
void ares__timeval_remaining(struct timeval *remaining,
const struct timeval *now,
const struct timeval *tout)
{
memset(remaining, 0, sizeof(*remaining));
/* Expired! */
if (tout->tv_sec < now->tv_sec ||
(tout->tv_sec == now->tv_sec && tout->tv_usec < now->tv_usec)) {
return;
}
remaining->tv_sec = tout->tv_sec - now->tv_sec;
if (tout->tv_usec < now->tv_usec) {
remaining->tv_sec -= 1;
remaining->tv_usec = (tout->tv_usec + 1000000) - now->tv_usec;
} else {
remaining->tv_usec = tout->tv_usec - now->tv_usec;
}
}
struct timeval *ares_timeout(ares_channel_t *channel, struct timeval *maxtv,
struct timeval *tvbuf)
{
const struct query *query;
ares__slist_node_t *node;
struct timeval now;
/* The minimum timeout of all queries is always the first entry in
* channel->queries_by_timeout */
node = ares__slist_node_first(channel->queries_by_timeout);
/* no queries/timeout */
if (node == NULL) {
return maxtv; /* <-- maxtv can be null though, hrm */
}
query = ares__slist_node_val(node);
now = ares__tvnow();
ares__timeval_remaining(tvbuf, &now, &query->timeout);
if (maxtv == NULL) {
return tvbuf;
}
/* Return the minimum time between maxtv and tvbuf */
if (tvbuf->tv_sec > maxtv->tv_sec) {
return maxtv;
}
if (tvbuf->tv_sec < maxtv->tv_sec) {
return tvbuf;
}
if (tvbuf->tv_usec > maxtv->tv_usec) {
return maxtv;
}
return tvbuf;
}
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