Re-subimission of https://codereview.chromium.org/1041213003/
[chromium-blink-merge.git] / content / renderer / renderer_main_platform_delegate_mac.mm
blob98b0aa4d84a35b6ba10776155d93340923f2707f
1 // Copyright (c) 2012 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.
5 #include "content/renderer/renderer_main_platform_delegate.h"
7 #include <Carbon/Carbon.h>
8 #import <Cocoa/Cocoa.h>
9 #include <objc/runtime.h>
11 #include "base/command_line.h"
12 #include "base/logging.h"
13 #include "base/mac/mac_util.h"
14 #include "base/mac/scoped_cftyperef.h"
15 #include "base/strings/string_number_conversions.h"
16 #include "base/strings/sys_string_conversions.h"
17 #include "content/common/sandbox_mac.h"
18 #include "content/public/common/content_switches.h"
19 #include "content/common/sandbox_init_mac.h"
21 namespace content {
23 namespace {
25 // You are about to read a pretty disgusting hack. In a static initializer,
26 // CoreFoundation decides to connect with cfprefsd(8) using Mach IPC. There is
27 // no public way to close this Mach port after-the-fact, nor a way to stop it
28 // from happening since it is done pre-main in dyld. But the address of the
29 // CFMachPort can be found in the run loop's string description. Below, that
30 // address is parsed, cast, and then used to invalidate the Mach port to
31 // disable communication with cfprefsd.
32 void DisconnectCFNotificationCenter() {
33   base::ScopedCFTypeRef<CFStringRef> run_loop_description(
34       CFCopyDescription(CFRunLoopGetCurrent()));
35   const CFIndex length = CFStringGetLength(run_loop_description);
36   for (CFIndex i = 0; i < length; ) {
37     // Find the start of a CFMachPort run loop source, which looks like this,
38     // without new lines:
39     // 1 : <CFRunLoopSource 0x7d16ea90 [0xa160af80]>{signalled = No,
40     // valid = Yes, order = 0, context =
41     // <CFMachPort 0x7d16fe00 [0xa160af80]>{valid = Yes, port = 3a0f,
42     // source = 0x7d16ea90, callout =
43     // _ZL14MessageHandlerP12__CFMachPortPvlS1_ (0x96df59c2), context =
44     // <CFMachPort context 0x1475b>}}
45     CFRange run_loop_source_context_range;
46     if (!CFStringFindWithOptions(run_loop_description,
47             CFSTR(", context = <CFMachPort "), CFRangeMake(i, length - i),
48             0, &run_loop_source_context_range)) {
49       break;
50     }
51     i = run_loop_source_context_range.location +
52         run_loop_source_context_range.length;
54     // The address of the CFMachPort is the first hexadecimal address after the
55     // CF type name.
56     CFRange port_address_range = CFRangeMake(i, 0);
57     for (CFIndex j = port_address_range.location; j < length; ++j) {
58       UniChar c = CFStringGetCharacterAtIndex(run_loop_description, j);
59       if (c == ' ')
60         break;
61       ++port_address_range.length;
62     }
64     base::ScopedCFTypeRef<CFStringRef> port_address_string(
65         CFStringCreateWithSubstring(NULL, run_loop_description,
66             port_address_range));
67     if (!port_address_string)
68       continue;
70     // Convert the string to an address.
71     std::string port_address_std_string =
72         base::SysCFStringRefToUTF8(port_address_string);
73 #if __LP64__
74     uint64 port_address = 0;
75     if (!base::HexStringToUInt64(port_address_std_string, &port_address))
76       continue;
77 #else
78     uint32 port_address = 0;
79     if (!base::HexStringToUInt(port_address_std_string, &port_address))
80       continue;
81 #endif
83     // Cast the address to an object.
84     CFMachPortRef mach_port = reinterpret_cast<CFMachPortRef>(port_address);
85     if (CFGetTypeID(mach_port) != CFMachPortGetTypeID())
86       continue;
88     // Verify that this is the Mach port that needs to be disconnected by the
89     // name of its callout function. Example description (no new lines):
90     // <CFMachPort 0x7d16fe00 [0xa160af80]>{valid = Yes, port = 3a0f, source =
91     // 0x7d16ea90, callout = __CFXNotificationReceiveFromServer (0x96df59c2),
92     // context = <CFMachPort context 0x1475b>}
93     base::ScopedCFTypeRef<CFStringRef> port_description(
94         CFCopyDescription(mach_port));
95     if (CFStringFindWithOptions(port_description,
96             CFSTR(", callout = __CFXNotificationReceiveFromServer ("),
97             CFRangeMake(0, CFStringGetLength(port_description)),
98             0,
99             NULL)) {
100       CFMachPortInvalidate(mach_port);
101       return;
102     }
103   }
106 }  // namespace
108 RendererMainPlatformDelegate::RendererMainPlatformDelegate(
109     const MainFunctionParams& parameters)
110         : parameters_(parameters) {
113 RendererMainPlatformDelegate::~RendererMainPlatformDelegate() {
116 // TODO(mac-port): Any code needed to initialize a process for purposes of
117 // running a renderer needs to also be reflected in chrome_main.cc for
118 // --single-process support.
119 void RendererMainPlatformDelegate::PlatformInitialize() {
120   if (base::mac::IsOSYosemiteOrLater()) {
121     // This is needed by the NSAnimations run for the scrollbars. If we switch
122     // from native scrollers to drawing them in some other way, this warmup can
123     // be removed <http://crbug.com/306348>.
124     [NSScreen screens];
125   }
127   if (![NSThread isMultiThreaded]) {
128     NSString* string = @"";
129     [NSThread detachNewThreadSelector:@selector(length)
130                              toTarget:string
131                            withObject:nil];
132   }
135 void RendererMainPlatformDelegate::PlatformUninitialize() {
138 bool RendererMainPlatformDelegate::EnableSandbox() {
139   // Enable the sandbox.
140   bool sandbox_initialized = InitializeSandbox();
142   // The sandbox is now engaged. Make sure that the renderer has not connected
143   // itself to Cocoa.
144   CHECK(NSApp == nil);
146   DisconnectCFNotificationCenter();
148   return sandbox_initialized;
151 }  // namespace content