94 lines
2.3 KiB
C++
94 lines
2.3 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/EventFdBsd.h"
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char disable_linker_warning_about_empty_file_event_fd_bsd_cpp TD_UNUSED;
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#ifdef TD_EVENTFD_BSD
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#include "td/utils/logging.h"
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#include "td/utils/Slice.h"
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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namespace td {
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namespace detail {
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// TODO: it is extremely non optimal on Darwin. kqueue events should be used instead
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void EventFdBsd::init() {
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int fds[2];
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int err = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
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auto socketpair_errno = errno;
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#if TD_CYGWIN
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// it looks like CYGWIN bug
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int max_retries = 1000000;
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while (err == -1 && socketpair_errno == EADDRINUSE && max_retries-- > 0) {
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err = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
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socketpair_errno = errno;
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}
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// LOG_IF(ERROR, max_retries < 1000000) << max_retries;
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#endif
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LOG_IF(FATAL, err == -1) << Status::PosixError(socketpair_errno, "socketpair failed");
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detail::set_native_socket_is_blocking(fds[0], false).ensure();
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detail::set_native_socket_is_blocking(fds[1], false).ensure();
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in_ = Fd(fds[0], Fd::Mode::Owner);
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out_ = Fd(fds[1], Fd::Mode::Owner);
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}
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bool EventFdBsd::empty() {
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return in_.empty();
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}
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void EventFdBsd::close() {
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in_.close();
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out_.close();
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}
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Status EventFdBsd::get_pending_error() {
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return Status::OK();
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}
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const Fd &EventFdBsd::get_fd() const {
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return out_;
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}
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Fd &EventFdBsd::get_fd() {
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return out_;
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}
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void EventFdBsd::release() {
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int value = 1;
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auto result = in_.write(Slice(reinterpret_cast<const char *>(&value), sizeof(value)));
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if (result.is_error()) {
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LOG(FATAL) << "EventFdBsd write failed: " << result.error();
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}
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size_t size = result.ok();
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if (size != sizeof(value)) {
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LOG(FATAL) << "EventFdBsd write returned " << value << " instead of " << sizeof(value);
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}
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}
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void EventFdBsd::acquire() {
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out_.update_flags(Fd::Read);
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while (can_read(out_)) {
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uint8 value[1024];
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auto result = out_.read(MutableSlice(value, sizeof(value)));
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if (result.is_error()) {
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LOG(FATAL) << "EventFdBsd read failed:" << result.error();
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}
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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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