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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2025
//
// 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/ScopeGuard.h"
#include "td/utils/Status.h"
#include <cerrno>
namespace td {
namespace detail {
void Poll::init() {
}
void Poll::clear() {
pollfds_.clear();
}
void Poll::subscribe(PollableFd fd, PollFlags flags) {
unsubscribe(fd.ref());
struct pollfd pollfd;
pollfd.fd = fd.native_fd().fd();
pollfd.events = 0;
if (flags.can_read()) {
pollfd.events |= POLLIN;
}
if (flags.can_write()) {
pollfd.events |= POLLOUT;
}
pollfd.revents = 0;
pollfds_.push_back(pollfd);
fds_.push_back(std::move(fd));
}
void Poll::unsubscribe(PollableFdRef fd_ref) {
auto fd = fd_ref.lock();
SCOPE_EXIT {
fd.release_as_list_node();
};
for (auto it = pollfds_.begin(); it != pollfds_.end(); ++it) {
if (it->fd == fd.native_fd().fd()) {
pollfds_.erase(it);
fds_.erase(fds_.begin() + (it - pollfds_.begin()));
return;
}
}
}
void Poll::unsubscribe_before_close(PollableFdRef 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 (size_t i = 0; i < pollfds_.size(); i++) {
auto &pollfd = pollfds_[i];
auto &fd = fds_[i];
PollFlags flags;
if (pollfd.revents & POLLIN) {
pollfd.revents &= ~POLLIN;
flags = flags | PollFlags::Read();
}
if (pollfd.revents & POLLOUT) {
pollfd.revents &= ~POLLOUT;
flags = flags | PollFlags::Write();
}
if (pollfd.revents & POLLHUP) {
pollfd.revents &= ~POLLHUP;
flags = flags | PollFlags::Close();
}
if (pollfd.revents & POLLERR) {
pollfd.revents &= ~POLLERR;
flags = flags | PollFlags::Error();
}
if (pollfd.revents & POLLNVAL) {
LOG(FATAL) << "Unexpected POLLNVAL " << tag("fd", pollfd.fd);
}
if (pollfd.revents) {
LOG(FATAL) << "Unsupported poll events: " << pollfd.revents;
}
fd.add_flags(flags);
}
}
} // namespace detail
} // namespace td
#endif
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