Update from https://crrev.com/311076

net/tools/quic/quic_client_test.cc

+// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <dirent.h>
+#include <stdio.h>
+
+#include "base/basictypes.h"
+#include "base/strings/string_util.h"
+#include "net/quic/test_tools/quic_test_utils.h"
+#include "net/tools/epoll_server/epoll_server.h"
+#include "net/tools/quic/quic_client.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using net::EpollServer;
+
+namespace net {
+namespace tools {
+namespace test {
+namespace {
+
+int NumOpenFDs() {
+  int number_of_open_fds = 0;
+  char buf[256];
+  struct dirent* dp;
+
+  base::snprintf(buf, arraysize(buf), "/proc/%i/fd/", getpid());
+  DIR* dir = opendir(buf);
+  while ((dp = readdir(dir)) != NULL)
+    number_of_open_fds++;
+  closedir(dir);
+
+  return number_of_open_fds;
+}
+
+// Creates a new QuicClient and Initializes it. Caller is responsible for
+// deletion.
+QuicClient* CreateAndInitializeQuicClient(EpollServer* eps, uint16 port) {
+  IPEndPoint server_address(IPEndPoint(net::test::Loopback4(), port));
+  QuicServerId server_id("hostname", server_address.port(), false,
+                         PRIVACY_MODE_DISABLED);
+  QuicVersionVector versions = QuicSupportedVersions();
+  QuicClient* client =
+      new QuicClient(server_address, server_id, versions, false, eps);
+  EXPECT_TRUE(client->Initialize());
+  return client;
+}
+
+TEST(QuicClientTest, DoNotLeakFDs) {
+  // Make sure that the QuicClient doesn't leak FDs. Doing so could cause port
+  // exhaustion in long running processes which repeatedly create clients.
+
+  // Record initial number of FDs, after creation of EpollServer.
+  EpollServer eps;
+  int number_of_open_fds = NumOpenFDs();
+
+  // Create a number of clients, initialize them, and verify this has resulted
+  // in additional FDs being opened.
+  const int kNumClients = 5;
+  for (int i = 0; i < kNumClients; ++i) {
+    std::unique_ptr<QuicClient> client(
+        CreateAndInitializeQuicClient(&eps, net::test::kTestPort + i));
+
+    // Initializing the client will create a new FD.
+    EXPECT_LT(number_of_open_fds, NumOpenFDs());
+  }
+
+  // The FDs created by the QuicClients should now be closed.
+  EXPECT_EQ(number_of_open_fds, NumOpenFDs());
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace tools
+}  // namespace net