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/* MIT License
*
* Copyright (c) 2024 Brad House
*
* 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"
#include "ares_event.h"
#ifdef HAVE_POLL_H
# include <poll.h>
#endif
#if defined(HAVE_POLL)
static ares_bool_t ares_evsys_poll_init(ares_event_thread_t *e)
{
e->ev_signal = ares_pipeevent_create(e);
if (e->ev_signal == NULL) {
return ARES_FALSE; /* LCOV_EXCL_LINE: UntestablePath */
}
return ARES_TRUE;
}
static void ares_evsys_poll_destroy(ares_event_thread_t *e)
{
(void)e;
}
static ares_bool_t ares_evsys_poll_event_add(ares_event_t *event)
{
(void)event;
return ARES_TRUE;
}
static void ares_evsys_poll_event_del(ares_event_t *event)
{
(void)event;
}
static void ares_evsys_poll_event_mod(ares_event_t *event,
ares_event_flags_t new_flags)
{
(void)event;
(void)new_flags;
}
static size_t ares_evsys_poll_wait(ares_event_thread_t *e,
unsigned long timeout_ms)
{
size_t num_fds = 0;
ares_socket_t *fdlist = ares__htable_asvp_keys(e->ev_sock_handles, &num_fds);
struct pollfd *pollfd = NULL;
int rv;
size_t cnt = 0;
size_t i;
if (fdlist != NULL && num_fds) {
pollfd = ares_malloc_zero(sizeof(*pollfd) * num_fds);
if (pollfd == NULL) {
goto done; /* LCOV_EXCL_LINE: OutOfMemory */
}
for (i = 0; i < num_fds; i++) {
const ares_event_t *ev =
ares__htable_asvp_get_direct(e->ev_sock_handles, fdlist[i]);
pollfd[i].fd = ev->fd;
if (ev->flags & ARES_EVENT_FLAG_READ) {
pollfd[i].events |= POLLIN;
}
if (ev->flags & ARES_EVENT_FLAG_WRITE) {
pollfd[i].events |= POLLOUT;
}
}
}
ares_free(fdlist);
rv = poll(pollfd, (nfds_t)num_fds, (timeout_ms == 0) ? -1 : (int)timeout_ms);
if (rv <= 0) {
goto done;
}
for (i = 0; pollfd != NULL && i < num_fds; i++) {
ares_event_t *ev;
ares_event_flags_t flags = 0;
if (pollfd[i].revents == 0) {
continue;
}
cnt++;
ev = ares__htable_asvp_get_direct(e->ev_sock_handles, pollfd[i].fd);
if (ev == NULL || ev->cb == NULL) {
continue; /* LCOV_EXCL_LINE: DefensiveCoding */
}
if (pollfd[i].revents & (POLLERR | POLLHUP | POLLIN)) {
flags |= ARES_EVENT_FLAG_READ;
}
if (pollfd[i].revents & POLLOUT) {
flags |= ARES_EVENT_FLAG_WRITE;
}
ev->cb(e, pollfd[i].fd, ev->data, flags);
}
done:
ares_free(pollfd);
return cnt;
}
const ares_event_sys_t ares_evsys_poll = { "poll",
ares_evsys_poll_init,
ares_evsys_poll_destroy, /* NoOp */
ares_evsys_poll_event_add, /* NoOp */
ares_evsys_poll_event_del, /* NoOp */
ares_evsys_poll_event_mod, /* NoOp */
ares_evsys_poll_wait };
#endif
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