127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/utils/port/detail/Epoll.h"
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char disable_linker_warning_about_empty_file_epoll_cpp TD_UNUSED;
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#ifdef TD_POLL_EPOLL
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#include "td/utils/format.h"
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#include "td/utils/logging.h"
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#include "td/utils/Status.h"
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#include <cerrno>
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#include <unistd.h>
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namespace td {
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namespace detail {
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void Epoll::init() {
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CHECK(!epoll_fd_);
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epoll_fd_ = NativeFd(epoll_create(1));
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auto epoll_create_errno = errno;
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LOG_IF(FATAL, !epoll_fd_) << Status::PosixError(epoll_create_errno, "epoll_create failed");
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events_.resize(1000);
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}
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void Epoll::clear() {
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if (!epoll_fd_) {
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return;
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}
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events_.clear();
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epoll_fd_.close();
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for (auto *list_node = list_root_.next; list_node != &list_root_;) {
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auto pollable_fd = PollableFd::from_list_node(list_node);
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list_node = list_node->next;
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}
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}
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void Epoll::subscribe(PollableFd fd, PollFlags flags) {
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epoll_event event;
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event.events = EPOLLHUP | EPOLLERR | EPOLLET;
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#ifdef EPOLLRDHUP
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event.events |= EPOLLRDHUP;
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#endif
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if (flags.can_read()) {
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event.events |= EPOLLIN;
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}
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if (flags.can_write()) {
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event.events |= EPOLLOUT;
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}
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auto native_fd = fd.native_fd().fd();
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auto *list_node = fd.release_as_list_node();
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list_root_.put(list_node);
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event.data.ptr = list_node;
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int err = epoll_ctl(epoll_fd_.fd(), EPOLL_CTL_ADD, native_fd, &event);
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auto epoll_ctl_errno = errno;
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LOG_IF(FATAL, err == -1) << Status::PosixError(epoll_ctl_errno, "epoll_ctl ADD failed")
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<< ", epoll_fd = " << epoll_fd_.fd() << ", fd = " << native_fd;
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}
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void Epoll::unsubscribe(PollableFdRef fd_ref) {
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auto fd = fd_ref.lock();
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auto native_fd = fd.native_fd().fd();
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int err = epoll_ctl(epoll_fd_.fd(), EPOLL_CTL_DEL, native_fd, nullptr);
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auto epoll_ctl_errno = errno;
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LOG_IF(FATAL, err == -1) << Status::PosixError(epoll_ctl_errno, "epoll_ctl DEL failed")
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<< ", epoll_fd = " << epoll_fd_.fd() << ", fd = " << native_fd
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<< ", status = " << fd.native_fd().validate();
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}
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void Epoll::unsubscribe_before_close(PollableFdRef fd) {
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unsubscribe(fd);
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}
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void Epoll::run(int timeout_ms) {
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int ready_n = epoll_wait(epoll_fd_.fd(), &events_[0], static_cast<int>(events_.size()), timeout_ms);
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auto epoll_wait_errno = errno;
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LOG_IF(FATAL, ready_n == -1 && epoll_wait_errno != EINTR)
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<< Status::PosixError(epoll_wait_errno, "epoll_wait failed");
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for (int i = 0; i < ready_n; i++) {
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PollFlags flags;
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epoll_event *event = &events_[i];
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if (event->events & EPOLLIN) {
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event->events &= ~EPOLLIN;
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flags = flags | PollFlags::Read();
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}
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if (event->events & EPOLLOUT) {
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event->events &= ~EPOLLOUT;
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flags = flags | PollFlags::Write();
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}
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#ifdef EPOLLRDHUP
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if (event->events & EPOLLRDHUP) {
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event->events &= ~EPOLLRDHUP;
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flags = flags | PollFlags::Close();
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}
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#endif
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if (event->events & EPOLLHUP) {
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event->events &= ~EPOLLHUP;
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flags = flags | PollFlags::Close();
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}
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if (event->events & EPOLLERR) {
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event->events &= ~EPOLLERR;
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flags = flags | PollFlags::Error();
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}
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if (event->events) {
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LOG(FATAL) << "Unsupported epoll events: " << static_cast<int32>(event->events);
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}
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//LOG(DEBUG) << "Epoll event " << tag("fd", event->data.fd) << tag("flags", format::as_binary(flags));
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auto pollable_fd = PollableFd::from_list_node(static_cast<ListNode *>(event->data.ptr));
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pollable_fd.add_flags(flags);
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pollable_fd.release_as_list_node();
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}
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}
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} // namespace detail
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} // namespace td
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#endif
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