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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_SYS_EPOLL_H
# include <sys/epoll.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_EPOLL
typedef struct {
int epoll_fd;
} ares_evsys_epoll_t;
static void ares_evsys_epoll_destroy(ares_event_thread_t *e)
{
ares_evsys_epoll_t *ep = NULL;
if (e == NULL) {
return; /* LCOV_EXCL_LINE: DefensiveCoding */
}
ep = e->ev_sys_data;
if (ep == NULL) {
return; /* LCOV_EXCL_LINE: DefensiveCoding */
}
if (ep->epoll_fd != -1) {
close(ep->epoll_fd);
}
ares_free(ep);
e->ev_sys_data = NULL;
}
static ares_bool_t ares_evsys_epoll_init(ares_event_thread_t *e)
{
ares_evsys_epoll_t *ep = NULL;
ep = ares_malloc_zero(sizeof(*ep));
if (ep == NULL) {
return ARES_FALSE; /* LCOV_EXCL_LINE: OutOfMemory */
}
e->ev_sys_data = ep;
ep->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
if (ep->epoll_fd == -1) {
ares_evsys_epoll_destroy(e); /* LCOV_EXCL_LINE: UntestablePath */
return ARES_FALSE; /* LCOV_EXCL_LINE: UntestablePath */
}
e->ev_signal = ares_pipeevent_create(e);
if (e->ev_signal == NULL) {
ares_evsys_epoll_destroy(e); /* LCOV_EXCL_LINE: UntestablePath */
return ARES_FALSE; /* LCOV_EXCL_LINE: UntestablePath */
}
return ARES_TRUE;
}
static ares_bool_t ares_evsys_epoll_event_add(ares_event_t *event)
{
const ares_event_thread_t *e = event->e;
const ares_evsys_epoll_t *ep = e->ev_sys_data;
struct epoll_event epev;
memset(&epev, 0, sizeof(epev));
epev.data.fd = event->fd;
epev.events = EPOLLRDHUP | EPOLLERR | EPOLLHUP;
if (event->flags & ARES_EVENT_FLAG_READ) {
epev.events |= EPOLLIN;
}
if (event->flags & ARES_EVENT_FLAG_WRITE) {
epev.events |= EPOLLOUT;
}
if (epoll_ctl(ep->epoll_fd, EPOLL_CTL_ADD, event->fd, &epev) != 0) {
return ARES_FALSE; /* LCOV_EXCL_LINE: UntestablePath */
}
return ARES_TRUE;
}
static void ares_evsys_epoll_event_del(ares_event_t *event)
{
const ares_event_thread_t *e = event->e;
const ares_evsys_epoll_t *ep = e->ev_sys_data;
struct epoll_event epev;
memset(&epev, 0, sizeof(epev));
epev.data.fd = event->fd;
epoll_ctl(ep->epoll_fd, EPOLL_CTL_DEL, event->fd, &epev);
}
static void ares_evsys_epoll_event_mod(ares_event_t *event,
ares_event_flags_t new_flags)
{
const ares_event_thread_t *e = event->e;
const ares_evsys_epoll_t *ep = e->ev_sys_data;
struct epoll_event epev;
memset(&epev, 0, sizeof(epev));
epev.data.fd = event->fd;
epev.events = EPOLLRDHUP | EPOLLERR | EPOLLHUP;
if (new_flags & ARES_EVENT_FLAG_READ) {
epev.events |= EPOLLIN;
}
if (new_flags & ARES_EVENT_FLAG_WRITE) {
epev.events |= EPOLLOUT;
}
epoll_ctl(ep->epoll_fd, EPOLL_CTL_MOD, event->fd, &epev);
}
static size_t ares_evsys_epoll_wait(ares_event_thread_t *e,
unsigned long timeout_ms)
{
struct epoll_event events[8];
size_t nevents = sizeof(events) / sizeof(*events);
const ares_evsys_epoll_t *ep = e->ev_sys_data;
int rv;
size_t i;
size_t cnt = 0;
memset(events, 0, sizeof(events));
rv = epoll_wait(ep->epoll_fd, events, (int)nevents,
(timeout_ms == 0) ? -1 : (int)timeout_ms);
if (rv < 0) {
return 0; /* LCOV_EXCL_LINE: UntestablePath */
}
nevents = (size_t)rv;
for (i = 0; i < nevents; i++) {
ares_event_t *ev;
ares_event_flags_t flags = 0;
ev = ares__htable_asvp_get_direct(e->ev_sock_handles,
(ares_socket_t)events[i].data.fd);
if (ev == NULL || ev->cb == NULL) {
continue; /* LCOV_EXCL_LINE: DefensiveCoding */
}
cnt++;
if (events[i].events & (EPOLLIN | EPOLLRDHUP | EPOLLHUP | EPOLLERR)) {
flags |= ARES_EVENT_FLAG_READ;
}
if (events[i].events & EPOLLOUT) {
flags |= ARES_EVENT_FLAG_WRITE;
}
ev->cb(e, ev->fd, ev->data, flags);
}
return cnt;
}
const ares_event_sys_t ares_evsys_epoll = { "epoll",
ares_evsys_epoll_init,
ares_evsys_epoll_destroy,
ares_evsys_epoll_event_add,
ares_evsys_epoll_event_del,
ares_evsys_epoll_event_mod,
ares_evsys_epoll_wait };
#endif
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