93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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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/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(const Fd &fd, Fd::Flags flags) {
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unsubscribe(fd);
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struct pollfd pollfd;
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pollfd.fd = fd.get_native_fd();
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pollfd.events = 0;
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if (flags & Fd::Read) {
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pollfd.events |= POLLIN;
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}
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if (flags & Fd::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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}
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void Poll::unsubscribe(const Fd &fd) {
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for (auto it = pollfds_.begin(); it != pollfds_.end(); ++it) {
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if (it->fd == fd.get_native_fd()) {
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pollfds_.erase(it);
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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(const Fd &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 (auto &pollfd : pollfds_) {
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Fd::Flags flags = 0;
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if (pollfd.revents & POLLIN) {
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pollfd.revents &= ~POLLIN;
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flags |= Fd::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 |= Fd::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 |= Fd::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 |= Fd::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(pollfd.fd, Fd::Mode::Reference).update_flags_notify(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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