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115 lines
3.0 KiB
C++
115 lines
3.0 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2019 Telegram Systems LLP
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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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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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