1 files changed, 92 insertions, 0 deletions
diff --git a/libs/tdlib/td/tdutils/td/utils/port/detail/Poll.cpp b/libs/tdlib/td/tdutils/td/utils/port/detail/Poll.cpp
new file mode 100644
index 0000000000..87a7391802
--- /dev/null
+++ b/libs/tdlib/td/tdutils/td/utils/port/detail/Poll.cpp
@@ -0,0 +1,92 @@
+//
+// 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