105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
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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/Poll.h"
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char disable_linker_warning_about_empty_file_poll_cpp TD_UNUSED;
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#ifdef TD_POLL_POLL
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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/misc.h"
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#include "td/utils/ScopeGuard.h"
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#include "td/utils/Status.h"
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#include <cerrno>
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namespace td {
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namespace detail {
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void Poll::init() {
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}
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void Poll::clear() {
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pollfds_.clear();
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}
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void Poll::subscribe(PollableFd fd, PollFlags flags) {
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unsubscribe(fd.ref());
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struct pollfd pollfd;
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pollfd.fd = fd.native_fd().fd();
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pollfd.events = 0;
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if (flags.can_read()) {
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pollfd.events |= POLLIN;
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}
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if (flags.can_write()) {
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pollfd.events |= POLLOUT;
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}
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pollfd.revents = 0;
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pollfds_.push_back(pollfd);
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fds_.push_back(std::move(fd));
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}
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void Poll::unsubscribe(PollableFdRef fd_ref) {
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auto fd = fd_ref.lock();
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SCOPE_EXIT {
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fd.release_as_list_node();
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};
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for (auto it = pollfds_.begin(); it != pollfds_.end(); ++it) {
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if (it->fd == fd.native_fd().fd()) {
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pollfds_.erase(it);
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fds_.erase(fds_.begin() + (it - pollfds_.begin()));
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return;
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}
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}
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}
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void Poll::unsubscribe_before_close(PollableFdRef fd) {
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unsubscribe(fd);
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}
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void Poll::run(int timeout_ms) {
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int err = poll(pollfds_.data(), narrow_cast<int>(pollfds_.size()), timeout_ms);
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auto poll_errno = errno;
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LOG_IF(FATAL, err == -1 && poll_errno != EINTR) << Status::PosixError(poll_errno, "poll failed");
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for (size_t i = 0; i < pollfds_.size(); i++) {
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auto &pollfd = pollfds_[i];
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auto &fd = fds_[i];
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PollFlags flags;
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if (pollfd.revents & POLLIN) {
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pollfd.revents &= ~POLLIN;
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flags = flags | PollFlags::Read();
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}
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if (pollfd.revents & POLLOUT) {
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pollfd.revents &= ~POLLOUT;
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flags = flags | PollFlags::Write();
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}
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if (pollfd.revents & POLLHUP) {
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pollfd.revents &= ~POLLHUP;
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flags = flags | PollFlags::Close();
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}
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if (pollfd.revents & POLLERR) {
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pollfd.revents &= ~POLLERR;
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flags = flags | PollFlags::Error();
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}
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if (pollfd.revents & POLLNVAL) {
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LOG(FATAL) << "Unexpected POLLNVAL " << tag("fd", pollfd.fd);
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}
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if (pollfd.revents) {
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LOG(FATAL) << "Unsupported poll events: " << pollfd.revents;
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}
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fd.add_flags(flags);
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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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