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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/EventFdBsd.h"
char disable_linker_warning_about_empty_file_event_fd_bsd_cpp TD_UNUSED;
#ifdef TD_EVENTFD_BSD
#include "td/utils/logging.h"
#include "td/utils/port/detail/NativeFd.h"
#include "td/utils/port/detail/skip_eintr.h"
#include "td/utils/port/PollFlags.h"
#include "td/utils/port/SocketFd.h"
#include "td/utils/Slice.h"
#include <cerrno>
#include <fcntl.h>
#include <poll.h>
#include <sys/socket.h>
#include <sys/types.h>
namespace td {
namespace detail {
// TODO: it is extremely non optimal on Darwin. kqueue events should be used instead
void EventFdBsd::init() {
int fds[2];
int err = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
auto socketpair_errno = errno;
#if TD_CYGWIN
// it looks like CYGWIN bug
int max_retries = 1000000;
while (err == -1 && socketpair_errno == EADDRINUSE && max_retries-- > 0) {
err = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
socketpair_errno = errno;
}
// LOG_IF(ERROR, max_retries < 1000000) << max_retries;
#endif
LOG_IF(FATAL, err == -1) << Status::PosixError(socketpair_errno, "socketpair failed");
auto fd_a = NativeFd(fds[0]);
auto fd_b = NativeFd(fds[1]);
fd_a.set_is_blocking_unsafe(false).ensure();
fd_b.set_is_blocking_unsafe(false).ensure();
in_ = SocketFd::from_native_fd(std::move(fd_a)).move_as_ok();
out_ = SocketFd::from_native_fd(std::move(fd_b)).move_as_ok();
}
bool EventFdBsd::empty() {
return in_.empty();
}
void EventFdBsd::close() {
in_.close();
out_.close();
}
Status EventFdBsd::get_pending_error() {
return Status::OK();
}
PollableFdInfo &EventFdBsd::get_poll_info() {
return out_.get_poll_info();
}
void EventFdBsd::release() {
int value = 1;
auto result = in_.write(Slice(reinterpret_cast<const char *>(&value), sizeof(value)));
if (result.is_error()) {
LOG(FATAL) << "EventFdBsd write failed: " << result.error();
}
size_t size = result.ok();
if (size != sizeof(value)) {
LOG(FATAL) << "EventFdBsd write returned " << size << " instead of " << sizeof(value);
}
}
void EventFdBsd::acquire() {
sync_with_poll(out_);
out_.get_poll_info().add_flags(PollFlags::Read());
while (can_read_local(out_)) {
uint8 value[1024];
auto result = out_.read(MutableSlice(value, sizeof(value)));
if (result.is_error()) {
LOG(FATAL) << "EventFdBsd read failed:" << result.error();
}
}
}
void EventFdBsd::wait(int timeout_ms) {
detail::skip_eintr_timeout(
[this](int timeout_ms) {
pollfd fd;
fd.fd = get_poll_info().native_fd().fd();
fd.events = POLLIN;
return poll(&fd, 1, timeout_ms);
},
timeout_ms);
}
} // namespace detail
} // namespace td
#endif
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