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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_private.h"
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
void ares_timeval_remaining(ares_timeval_t *remaining,
const ares_timeval_t *now,
const ares_timeval_t *tout)
{
memset(remaining, 0, sizeof(*remaining));
/* Expired! */
if (tout->sec < now->sec ||
(tout->sec == now->sec && tout->usec < now->usec)) {
return;
}
remaining->sec = tout->sec - now->sec;
if (tout->usec < now->usec) {
remaining->sec -= 1;
remaining->usec = (tout->usec + 1000000) - now->usec;
} else {
remaining->usec = tout->usec - now->usec;
}
}
void ares_timeval_diff(ares_timeval_t *tvdiff, const ares_timeval_t *tvstart,
const ares_timeval_t *tvstop)
{
tvdiff->sec = tvstop->sec - tvstart->sec;
if (tvstop->usec > tvstart->usec) {
tvdiff->usec = tvstop->usec - tvstart->usec;
} else {
tvdiff->sec -= 1;
tvdiff->usec = tvstop->usec + 1000000 - tvstart->usec;
}
}
static void ares_timeval_to_struct_timeval(struct timeval *tv,
const ares_timeval_t *atv)
{
#ifdef USE_WINSOCK
tv->tv_sec = (long)atv->sec;
#else
tv->tv_sec = (time_t)atv->sec;
#endif
tv->tv_usec = (int)atv->usec;
}
static void struct_timeval_to_ares_timeval(ares_timeval_t *atv,
const struct timeval *tv)
{
atv->sec = (ares_int64_t)tv->tv_sec;
atv->usec = (unsigned int)tv->tv_usec;
}
static struct timeval *ares_timeout_int(const ares_channel_t *channel,
struct timeval *maxtv,
struct timeval *tvbuf)
{
const ares_query_t *query;
ares_slist_node_t *node;
ares_timeval_t now;
ares_timeval_t atvbuf;
ares_timeval_t amaxtv;
/* 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;
}
query = ares_slist_node_val(node);
ares_tvnow(&now);
ares_timeval_remaining(&atvbuf, &now, &query->timeout);
ares_timeval_to_struct_timeval(tvbuf, &atvbuf);
if (maxtv == NULL) {
return tvbuf;
}
/* Return the minimum time between maxtv and tvbuf */
struct_timeval_to_ares_timeval(&amaxtv, maxtv);
if (atvbuf.sec > amaxtv.sec) {
return maxtv;
}
if (atvbuf.sec < amaxtv.sec) {
return tvbuf;
}
if (atvbuf.usec > amaxtv.usec) {
return maxtv;
}
return tvbuf;
}
struct timeval *ares_timeout(const ares_channel_t *channel,
struct timeval *maxtv, struct timeval *tvbuf)
{
struct timeval *rv;
if (channel == NULL || tvbuf == NULL) {
return NULL;
}
ares_channel_lock(channel);
rv = ares_timeout_int(channel, maxtv, tvbuf);
ares_channel_unlock(channel);
return rv;
}
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