tdlight/tdutils/td/utils/port/detail/Poll.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/port/detail/Poll.h"
char disable_linker_warning_about_empty_file_poll_cpp TD_UNUSED;
#ifdef TD_POLL_POLL
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/Status.h"
namespace td {
namespace detail {
void Poll::init() {
}
void Poll::clear() {
pollfds_.clear();
}
void Poll::subscribe(const Fd &fd, Fd::Flags flags) {
unsubscribe(fd);
struct pollfd pollfd;
pollfd.fd = fd.get_native_fd();
pollfd.events = 0;
if (flags & Fd::Read) {
pollfd.events |= POLLIN;
}
if (flags & Fd::Write) {
pollfd.events |= POLLOUT;
}
pollfd.revents = 0;
pollfds_.push_back(pollfd);
}
void Poll::unsubscribe(const Fd &fd) {
for (auto it = pollfds_.begin(); it != pollfds_.end(); ++it) {
if (it->fd == fd.get_native_fd()) {
pollfds_.erase(it);
return;
}
}
}
void Poll::unsubscribe_before_close(const Fd &fd) {
unsubscribe(fd);
}
void Poll::run(int timeout_ms) {
int err = poll(pollfds_.data(), narrow_cast<int>(pollfds_.size()), timeout_ms);
auto poll_errno = errno;
LOG_IF(FATAL, err == -1 && poll_errno != EINTR) << Status::PosixError(poll_errno, "poll failed");
for (auto &pollfd : pollfds_) {
Fd::Flags flags = 0;
if (pollfd.revents & POLLIN) {
pollfd.revents &= ~POLLIN;
flags |= Fd::Read;
}
if (pollfd.revents & POLLOUT) {
pollfd.revents &= ~POLLOUT;
flags |= Fd::Write;
}
if (pollfd.revents & POLLHUP) {
pollfd.revents &= ~POLLHUP;
flags |= Fd::Close;
}
if (pollfd.revents & POLLERR) {
pollfd.revents &= ~POLLERR;
flags |= Fd::Error;
}
if (pollfd.revents & POLLNVAL) {
LOG(FATAL) << "Unexpected POLLNVAL " << tag("fd", pollfd.fd);
}
if (pollfd.revents) {
LOG(FATAL) << "Unsupported poll events: " << pollfd.revents;
}
Fd(pollfd.fd, Fd::Mode::Reference).update_flags_notify(flags);
}
}
} // namespace detail
} // namespace td
#endif