1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include <mach/mach.h>
6
7#include <vector>
8
9#include "base/memory/ref_counted.h"
10#include "base/strings/string_util.h"
11#include "base/strings/stringprintf.h"
12#include "chrome/browser/ui/browser.h"
13#include "chrome/browser/ui/browser_window.h"
14#include "chrome/browser/ui/tabs/tab_strip_model.h"
15#include "chrome/test/base/in_process_browser_test.h"
16#include "net/test/spawned_test_server/spawned_test_server.h"
17#include "testing/perf/perf_test.h"
18
19namespace {
20
21// This test spawns a new browser and counts the number of open Mach ports in
22// the browser process. It navigates tabs and closes them, repeatedly measuring
23// the number of open ports. This is used to protect against leaking Mach ports,
24// which was the source of <http://crbug.com/105513>.
25class MachPortsTest : public InProcessBrowserTest {
26 public:
27  MachPortsTest()
28      : server_(net::SpawnedTestServer::TYPE_HTTP,
29                net::SpawnedTestServer::kLocalhost,
30                base::FilePath(FILE_PATH_LITERAL("data/mach_ports/moz"))) {
31  }
32
33  virtual void SetUp() OVERRIDE {
34    InProcessBrowserTest::SetUp();
35
36    ASSERT_TRUE(server_.Start());
37  }
38
39  virtual void TearDown() OVERRIDE {
40    std::string ports;
41    for (std::vector<int>::iterator it = port_counts_.begin();
42         it != port_counts_.end(); ++it) {
43      base::StringAppendF(&ports, "%d,", *it);
44    }
45    perf_test::PrintResultList("mach_ports", "", "", ports, "ports", true);
46
47    InProcessBrowserTest::TearDown();
48  }
49
50  // Gets the browser's current number of Mach ports and records it.
51  void RecordPortCount() {
52    mach_port_name_array_t names;
53    mach_msg_type_number_t names_count = 0;
54    mach_port_type_array_t types;
55    mach_msg_type_number_t types_count = 0;
56
57    mach_port_t self = mach_task_self();
58
59    // A friendlier interface would allow NULL buffers to only get the counts.
60    kern_return_t kr = mach_port_names(self,
61                                       &names, &names_count,
62                                       &types, &types_count);
63    ASSERT_EQ(KERN_SUCCESS, kr) << "Failed to get mach_port_names(): "
64                                << mach_error_string(kr);
65    ASSERT_EQ(names_count, types_count);  // Documented kernel invariant.
66
67    port_counts_.push_back(names_count);
68
69    vm_deallocate(self, reinterpret_cast<vm_address_t>(names),
70        names_count * sizeof(mach_port_name_array_t));
71    vm_deallocate(self, reinterpret_cast<vm_address_t>(types),
72        types_count * sizeof(mach_port_type_array_t));
73  }
74
75  // Adds a tab from the page cycler data at the specified domain.
76  void AddTab(const std::string& domain) {
77    GURL url = server_.GetURL("files/" + domain + "/").Resolve("?skip");
78    AddTabAtIndex(0, url, ui::PAGE_TRANSITION_TYPED);
79  }
80
81 private:
82  net::SpawnedTestServer server_;
83  std::vector<int> port_counts_;
84};
85
86IN_PROC_BROWSER_TEST_F(MachPortsTest, GetCounts) {
87  browser()->window()->Show();
88
89  // Record startup number.
90  RecordPortCount();
91
92  // Create a browser and open a few tabs.
93  AddTab("www.google.com");
94  RecordPortCount();
95
96  AddTab("www.cnn.com");
97  RecordPortCount();
98
99  AddTab("www.nytimes.com");
100  RecordPortCount();
101
102  TabStripModel* tab_strip_model = browser()->tab_strip_model();
103  int tab_count = tab_strip_model->count();
104  ASSERT_EQ(4, tab_count);  // Also count about:blank.
105
106  // Close each tab, recording the number of ports after each. Do not close the
107  // last tab, which is about:blank.
108  for (int i = 0; i < tab_count - 1; ++i) {
109    EXPECT_TRUE(
110        tab_strip_model->CloseWebContentsAt(0, TabStripModel::CLOSE_NONE));
111    RecordPortCount();
112  }
113}
114
115}  // namespace
116