1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
content / browser / child_process_launcher_helper_ios.mm [blame]
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/child_process_launcher_helper.h"
#import <BrowserEngineKit/BrowserEngineKit.h>
#include <list>
#include "base/apple/mach_port_rendezvous.h"
#include "base/no_destructor.h"
#include "base/threading/platform_thread.h"
#include "content/browser/child_process_launcher.h"
#include "content/browser/child_process_launcher_helper_posix.h"
#include "content/public/browser/child_process_launcher_utils.h"
#include "content/public/common/content_switches.h"
#include "services/network/public/mojom/network_service.mojom.h"
namespace content {
namespace internal {
static base::NoDestructor<base::Lock> g_process_table_lock_;
static base::NoDestructor<
std::map<pid_t, scoped_refptr<ChildProcessLauncherHelper>>>
g_process_table_;
void InvalidateProcess(NSObject* process) {
if ([process isKindOfClass:[BEWebContentProcess class]]) {
[(BEWebContentProcess*)process invalidate];
} else if ([process isKindOfClass:[BENetworkingProcess class]]) {
[(BENetworkingProcess*)process invalidate];
} else if ([process isKindOfClass:[BERenderingProcess class]]) {
[(BERenderingProcess*)process invalidate];
}
}
void OnChildProcessTerminatedOnAnyThread(pid_t process_id) {
base::AutoLock guard(*g_process_table_lock_);
auto it = g_process_table_->find(process_id);
if (it != g_process_table_->end()) {
it->second->ClearProcessStorage();
g_process_table_->erase(it);
}
}
bool TerminateNow(pid_t process_id) {
NSObject* process = nullptr;
{
base::AutoLock guard(*g_process_table_lock_);
auto it = g_process_table_->find(process_id);
if (it != g_process_table_->end()) {
process = it->second->GetProcess();
}
}
if (!process) {
return false;
}
InvalidateProcess(process);
return true;
}
bool WaitForExit(pid_t process_id, int* exit_code, base::TimeDelta timeout) {
base::TimeTicks wakeup_time = base::TimeTicks::Now() + timeout;
constexpr uint32_t kMaxSleepInMicroseconds = 1 << 18; // ~256 ms.
uint32_t max_sleep_time_usecs = 1 << 10; // ~1 ms.
int double_sleep_time = 0;
while (true) {
{
base::AutoLock guard(*g_process_table_lock_);
auto it = g_process_table_->find(process_id);
if (it != g_process_table_->end()) {
if (it->second->GetProcess() == nullptr) {
if (exit_code) {
*exit_code = 0;
}
return true;
}
} else {
return true;
}
}
base::TimeTicks now = base::TimeTicks::Now();
if (now > wakeup_time) {
return false;
}
const uint32_t sleep_time_usecs = static_cast<uint32_t>(
std::min(static_cast<uint64_t>((wakeup_time - now).InMicroseconds()),
uint64_t{max_sleep_time_usecs}));
base::PlatformThread::Sleep(base::Microseconds(sleep_time_usecs));
if ((max_sleep_time_usecs < kMaxSleepInMicroseconds) &&
(double_sleep_time++ % 4 == 0)) {
max_sleep_time_usecs *= 2;
}
}
}
// Object used to pass the result of the launch from the async
// dispatch_queue to the LauncherThread.
class LaunchResult {
public:
void Invalidate() { InvalidateProcess(process); }
id<BEProcessCapabilityGrant> GrantForeground(NSError** error) {
id<BEProcessCapabilityGrant> grant;
BEProcessCapability* cap = [BEProcessCapability foreground];
if ([process isKindOfClass:[BEWebContentProcess class]]) {
grant = [(BEWebContentProcess*)process grantCapability:cap error:error];
} else if ([process isKindOfClass:[BENetworkingProcess class]]) {
grant = [(BENetworkingProcess*)process grantCapability:cap error:error];
} else if ([process isKindOfClass:[BERenderingProcess class]]) {
grant = [(BERenderingProcess*)process grantCapability:cap error:error];
}
return grant;
}
xpc_connection_t CreateXPCConnection(NSError** error) {
if ([process isKindOfClass:[BEWebContentProcess class]]) {
return [(BEWebContentProcess*)process makeLibXPCConnectionError:error];
} else if ([process isKindOfClass:[BENetworkingProcess class]]) {
return [(BENetworkingProcess*)process makeLibXPCConnectionError:error];
} else if ([process isKindOfClass:[BERenderingProcess class]]) {
return [(BERenderingProcess*)process makeLibXPCConnectionError:error];
}
return {};
}
NSObject* process;
NSError* launch_error;
};
// Object to store the process handles.
class ProcessStorage : public ProcessStorageBase {
public:
ProcessStorage(NSObject* process,
xpc_connection_t connection,
id<BEProcessCapabilityGrant> grant)
: process_(process), ipc_channel_(connection), grant_(grant) {}
~ProcessStorage() override { [grant_ invalidate]; }
void ReleaseProcess() override { process_ = nullptr; }
NSObject* Process() { return process_; }
private:
NSObject* process_;
[[maybe_unused]] xpc_connection_t ipc_channel_;
id<BEProcessCapabilityGrant> grant_;
};
std::optional<mojo::NamedPlatformChannel>
ChildProcessLauncherHelper::CreateNamedPlatformChannelOnLauncherThread() {
DCHECK(CurrentlyOnProcessLauncherTaskRunner());
return std::nullopt;
}
void ChildProcessLauncherHelper::BeforeLaunchOnClientThread() {
DCHECK(client_task_runner_->RunsTasksInCurrentSequence());
}
std::unique_ptr<PosixFileDescriptorInfo>
ChildProcessLauncherHelper::GetFilesToMap() {
DCHECK(CurrentlyOnProcessLauncherTaskRunner());
return CreateDefaultPosixFilesToMap(
child_process_id(), mojo_channel_->remote_endpoint(),
/*files_to_preload=*/{}, GetProcessType(), command_line());
}
bool ChildProcessLauncherHelper::BeforeLaunchOnLauncherThread(
FileMappedForLaunch& files_to_register,
base::LaunchOptions* options) {
mojo::PlatformHandle endpoint =
mojo_channel_->TakeRemoteEndpoint().TakePlatformHandle();
DCHECK(endpoint.is_valid_mach_receive());
options->mach_ports_for_rendezvous.insert(std::make_pair(
'mojo', base::MachRendezvousPort(endpoint.TakeMachReceiveRight())));
return true;
}
ChildProcessLauncherHelper::Process
ChildProcessLauncherHelper::LaunchProcessOnLauncherThread(
const base::LaunchOptions* options,
std::unique_ptr<PosixFileDescriptorInfo> files_to_register,
bool* is_synchronous_launch,
int* launch_result) {
DCHECK(options);
*is_synchronous_launch = false;
rendezvous_server_ = std::make_unique<base::MachPortRendezvousServerIOS>(
options->mach_ports_for_rendezvous);
// We need to hand out unique "process ids" just use a static counter
// for now. There should only be one launcher thread so this is
// synchronous access it doesn't need to be an atomic.
static pid_t g_pid = 0;
pid_t process_id = ++g_pid;
static bool g_hooks_registered = false;
if (!g_hooks_registered) {
base::Process::SetTerminationHooks(&TerminateNow, &WaitForExit);
g_hooks_registered = true;
}
void (^process_terminated)() = ^void() {
OnChildProcessTerminatedOnAnyThread(process_id);
};
std::string process_type = GetProcessType();
std::string utility_sub_type =
command_line()->GetSwitchValueASCII(switches::kUtilitySubType);
if (process_type == switches::kUtilityProcess &&
utility_sub_type == network::mojom::NetworkService::Name_) {
void (^process_launch_complete)(BENetworkingProcess* process,
NSError* error) =
^void(BENetworkingProcess* process, NSError* error) {
auto result = std::make_unique<LaunchResult>(process, error);
GetProcessLauncherTaskRunner()->PostTask(
FROM_HERE,
base::BindOnce(&ChildProcessLauncherHelper::OnChildProcessStarted,
this, process_id, std::move(result)));
};
[BENetworkingProcess
networkProcessWithInterruptionHandler:process_terminated
completion:process_launch_complete];
} else if (process_type == switches::kGpuProcess) {
void (^process_launch_complete)(BERenderingProcess* process,
NSError* error) =
^void(BERenderingProcess* process, NSError* error) {
auto result = std::make_unique<LaunchResult>(process, error);
GetProcessLauncherTaskRunner()->PostTask(
FROM_HERE,
base::BindOnce(&ChildProcessLauncherHelper::OnChildProcessStarted,
this, process_id, std::move(result)));
};
[BERenderingProcess
renderingProcessWithInterruptionHandler:process_terminated
completion:process_launch_complete];
} else {
// This can be both kUtility and kRenderProcess.
void (^process_launch_complete)(BEWebContentProcess* process,
NSError* error) =
^void(BEWebContentProcess* process, NSError* error) {
auto result = std::make_unique<LaunchResult>(process, error);
GetProcessLauncherTaskRunner()->PostTask(
FROM_HERE,
base::BindOnce(&ChildProcessLauncherHelper::OnChildProcessStarted,
this, process_id, std::move(result)));
};
[BEWebContentProcess
webContentProcessWithInterruptionHandler:process_terminated
completion:process_launch_complete];
}
AddRef();
return Process();
}
void ChildProcessLauncherHelper::OnChildProcessStarted(
pid_t process_id,
std::unique_ptr<LaunchResult> launch_result) {
DCHECK(CurrentlyOnProcessLauncherTaskRunner());
scoped_refptr<ChildProcessLauncherHelper> ref(this);
Release(); // Balances with LaunchProcessOnLauncherThread.
int launch_result_code = LAUNCH_RESULT_FAILURE;
if (!launch_result->launch_error) {
NSError* error = nil;
// TODO(dtapuska): For now we grant everything foreground capability. We
// need to hook this grant up to the
// `RenderProcessHostImpl::UpdateProcessPriority()`.
id<BEProcessCapabilityGrant> grant = launch_result->GrantForeground(&error);
xpc_connection_t xpc_connection =
launch_result->CreateXPCConnection(&error);
if (xpc_connection) {
xpc_connection_set_event_handler(xpc_connection, ^(xpc_object_t event) {
if (event == XPC_ERROR_CONNECTION_INTERRUPTED) {
OnChildProcessTerminatedOnAnyThread(process_id);
}
});
xpc_connection_resume(xpc_connection);
xpc_object_t message = xpc_dictionary_create(nil, nil, 0);
xpc_object_t args_array = xpc_array_create_empty();
for (const auto& arg : command_line()->argv()) {
xpc_object_t value = xpc_string_create(arg.c_str());
xpc_array_append_value(args_array, value);
}
xpc_dictionary_set_value(message, "args", args_array);
xpc_dictionary_set_mach_send(
message, "port", rendezvous_server_->GetMachSendRight().get());
xpc_connection_send_message(xpc_connection, message);
launch_result_code = LAUNCH_RESULT_SUCCESS;
// Keep reference to process, xpc_connection and the grant for the process
// life.
process_storage_ = std::make_unique<ProcessStorage>(
launch_result->process, xpc_connection, grant);
// Add the process to the global table.
{
base::AutoLock guard(*g_process_table_lock_);
CHECK(!base::Contains(*g_process_table_, process_id));
g_process_table_->emplace(process_id, this);
}
} else {
[grant invalidate];
launch_result->Invalidate();
}
}
ChildProcessLauncherHelper::Process process;
process.process = base::Process(process_id);
#if TARGET_OS_SIMULATOR
process.process.SetIsContentProcess();
#endif
PostLaunchOnLauncherThread(std::move(process), launch_result_code);
}
bool ChildProcessLauncherHelper::IsUsingLaunchOptions() {
return true;
}
void ChildProcessLauncherHelper::AfterLaunchOnLauncherThread(
const ChildProcessLauncherHelper::Process& process,
const base::LaunchOptions* options) {}
ChildProcessTerminationInfo ChildProcessLauncherHelper::GetTerminationInfo(
const ChildProcessLauncherHelper::Process& process,
bool known_dead) {
ChildProcessTerminationInfo info;
if (!process_storage_) {
info.status = base::TERMINATION_STATUS_LAUNCH_FAILED;
} else if (static_cast<ProcessStorage*>(process_storage_.get())->Process() ==
nullptr) {
info.status = base::TERMINATION_STATUS_NORMAL_TERMINATION;
} else {
info.status = base::TERMINATION_STATUS_STILL_RUNNING;
}
return info;
}
void ChildProcessLauncherHelper::ClearProcessStorage() {
if (process_storage_) {
process_storage_->ReleaseProcess();
}
}
NSObject* ChildProcessLauncherHelper::GetProcess() {
if (process_storage_) {
return static_cast<ProcessStorage*>(process_storage_.get())->Process();
}
return nullptr;
}
// static
bool ChildProcessLauncherHelper::TerminateProcess(const base::Process& process,
int exit_code) {
// TODO(crbug.com/40565504): Determine whether we should also call
// EnsureProcessTerminated() to make sure of process-exit, and reap it.
return process.Terminate(exit_code, false);
}
// static
void ChildProcessLauncherHelper::ForceNormalProcessTerminationSync(
ChildProcessLauncherHelper::Process process) {
DCHECK(CurrentlyOnProcessLauncherTaskRunner());
// Client has gone away, so just kill the process. Using exit code 0 means
// that UMA won't treat this as a crash.
process.process.Terminate(RESULT_CODE_NORMAL_EXIT, false);
base::EnsureProcessTerminated(std::move(process.process));
}
void ChildProcessLauncherHelper::SetProcessPriorityOnLauncherThread(
base::Process process,
base::Process::Priority priority) {}
// static
base::File OpenFileToShare(const base::FilePath& path,
base::MemoryMappedFile::Region* region) {
// Not used yet (until required files are described in the service manifest on
// iOS).
NOTREACHED_IN_MIGRATION();
return base::File();
}
} // namespace internal
} // namespace content