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GCC Code Coverage Report

Directory:	../		Exec	Total	Coverage
File:	/home/iojs/build/workspace/node-test-commit-linux-coverage-daily/nodes/benchmark/out/../src/node_watchdog.cc	Lines:	168	200	84.0 %
Date:	2020-11-21 04:10:54	Branches:	41	74	55.4 %


// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include <algorithm>

#include "async_wrap-inl.h"
#include "debug_utils-inl.h"
#include "env-inl.h"
#include "node_errors.h"
#include "node_internals.h"
#include "node_watchdog.h"
#include "util-inl.h"

namespace node {

using v8::Context;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::Local;
using v8::Object;
using v8::Value;

Watchdog::Watchdog(v8::Isolate* isolate, uint64_t ms, bool* timed_out)
    : isolate_(isolate), timed_out_(timed_out) {

  int rc;
  rc = uv_loop_init(&loop_);
  if (rc != 0) {
    FatalError("node::Watchdog::Watchdog()",
               "Failed to initialize uv loop.");
  }

  rc = uv_async_init(&loop_, &async_, [](uv_async_t* signal) {
    Watchdog* w = ContainerOf(&Watchdog::async_, signal);
    uv_stop(&w->loop_);
  });

  CHECK_EQ(0, rc);

  rc = uv_timer_init(&loop_, &timer_);
  CHECK_EQ(0, rc);

  rc = uv_timer_start(&timer_, &Watchdog::Timer, ms, 0);
  CHECK_EQ(0, rc);

  rc = uv_thread_create(&thread_, &Watchdog::Run, this);
  CHECK_EQ(0, rc);
}


Watchdog::~Watchdog() {
  uv_async_send(&async_);
  uv_thread_join(&thread_);

  uv_close(reinterpret_cast<uv_handle_t*>(&async_), nullptr);

  // UV_RUN_DEFAULT so that libuv has a chance to clean up.
  uv_run(&loop_, UV_RUN_DEFAULT);

  CheckedUvLoopClose(&loop_);
}


void Watchdog::Run(void* arg) {
  Watchdog* wd = static_cast<Watchdog*>(arg);

  // UV_RUN_DEFAULT the loop will be stopped either by the async or the
  // timer handle.
  uv_run(&wd->loop_, UV_RUN_DEFAULT);

  // Loop ref count reaches zero when both handles are closed.
  // Close the timer handle on this side and let ~Watchdog() close async_
  uv_close(reinterpret_cast<uv_handle_t*>(&wd->timer_), nullptr);
}

void Watchdog::Timer(uv_timer_t* timer) {
  Watchdog* w = ContainerOf(&Watchdog::timer_, timer);
  *w->timed_out_ = true;
  w->isolate()->TerminateExecution();
  uv_stop(&w->loop_);
}


SigintWatchdog::SigintWatchdog(
  v8::Isolate* isolate, bool* received_signal)
    : isolate_(isolate), received_signal_(received_signal) {
  // Register this watchdog with the global SIGINT/Ctrl+C listener.
  SigintWatchdogHelper::GetInstance()->Register(this);
  // Start the helper thread, if that has not already happened.
  SigintWatchdogHelper::GetInstance()->Start();
}


SigintWatchdog::~SigintWatchdog() {
  SigintWatchdogHelper::GetInstance()->Unregister(this);
  SigintWatchdogHelper::GetInstance()->Stop();
}

SignalPropagation SigintWatchdog::HandleSigint() {
  *received_signal_ = true;
  isolate_->TerminateExecution();
  return SignalPropagation::kStopPropagation;
}

void TraceSigintWatchdog::Init(Environment* env, Local<Object> target) {
  Local<FunctionTemplate> constructor = env->NewFunctionTemplate(New);
  constructor->InstanceTemplate()->SetInternalFieldCount(
      TraceSigintWatchdog::kInternalFieldCount);
  Local<v8::String> js_sigint_watch_dog =
      FIXED_ONE_BYTE_STRING(env->isolate(), "TraceSigintWatchdog");
  constructor->SetClassName(js_sigint_watch_dog);
  constructor->Inherit(HandleWrap::GetConstructorTemplate(env));

  env->SetProtoMethod(constructor, "start", Start);
  env->SetProtoMethod(constructor, "stop", Stop);

  target
      ->Set(env->context(),
            js_sigint_watch_dog,
            constructor->GetFunction(env->context()).ToLocalChecked())
      .Check();
}

void TraceSigintWatchdog::New(const FunctionCallbackInfo<Value>& args) {
  // This constructor should not be exposed to public javascript.
  // Therefore we assert that we are not trying to call this as a
  // normal function.
  CHECK(args.IsConstructCall());
  Environment* env = Environment::GetCurrent(args);
  new TraceSigintWatchdog(env, args.This());
}

void TraceSigintWatchdog::Start(const FunctionCallbackInfo<Value>& args) {
  TraceSigintWatchdog* watchdog;
  ASSIGN_OR_RETURN_UNWRAP(&watchdog, args.Holder());
  // Register this watchdog with the global SIGINT/Ctrl+C listener.
  SigintWatchdogHelper::GetInstance()->Register(watchdog);
  // Start the helper thread, if that has not already happened.
  int r = SigintWatchdogHelper::GetInstance()->Start();
  CHECK_EQ(r, 0);
}

void TraceSigintWatchdog::Stop(const FunctionCallbackInfo<Value>& args) {
  TraceSigintWatchdog* watchdog;
  ASSIGN_OR_RETURN_UNWRAP(&watchdog, args.Holder());
  SigintWatchdogHelper::GetInstance()->Unregister(watchdog);
  SigintWatchdogHelper::GetInstance()->Stop();
}

TraceSigintWatchdog::TraceSigintWatchdog(Environment* env, Local<Object> object)
    : HandleWrap(env,
                 object,
                 reinterpret_cast<uv_handle_t*>(&handle_),
                 AsyncWrap::PROVIDER_SIGINTWATCHDOG) {
  int r = uv_async_init(env->event_loop(), &handle_, [](uv_async_t* handle) {
    TraceSigintWatchdog* watchdog =
        ContainerOf(&TraceSigintWatchdog::handle_, handle);
    watchdog->signal_flag_ = SignalFlags::FromIdle;
    watchdog->HandleInterrupt();
  });
  CHECK_EQ(r, 0);
  uv_unref(reinterpret_cast<uv_handle_t*>(&handle_));
}

SignalPropagation TraceSigintWatchdog::HandleSigint() {
  /**
   * In case of uv loop polling, i.e. no JS currently running, activate the
   * loop to run a piece of JS code to trigger interruption.
   */
  CHECK_EQ(uv_async_send(&handle_), 0);
  env()->isolate()->RequestInterrupt(
      [](v8::Isolate* isolate, void* data) {
        TraceSigintWatchdog* self = static_cast<TraceSigintWatchdog*>(data);
        if (self->signal_flag_ == SignalFlags::None) {
          self->signal_flag_ = SignalFlags::FromInterrupt;
        }
        self->HandleInterrupt();
      },
      this);
  return SignalPropagation::kContinuePropagation;
}

void TraceSigintWatchdog::HandleInterrupt() {
  // Do not nest interrupts.
  if (interrupting) {
    return;
  }
  interrupting = true;
  if (signal_flag_ == SignalFlags::None) {
    return;
  }
  Environment* env_ = env();
  // FIXME: Before
  // https://github.com/nodejs/node/pull/29207#issuecomment-527667993 get
  // fixed, additional JavaScript code evaluation shall be prevented from
  // running during interruption.
  FPrintF(stderr,
      "KEYBOARD_INTERRUPT: Script execution was interrupted by `SIGINT`\n");
  if (signal_flag_ == SignalFlags::FromInterrupt) {
    PrintStackTrace(env_->isolate(),
                    v8::StackTrace::CurrentStackTrace(
                        env_->isolate(), 10, v8::StackTrace::kDetailed));
  }
  signal_flag_ = SignalFlags::None;
  interrupting = false;

  SigintWatchdogHelper::GetInstance()->Unregister(this);
  SigintWatchdogHelper::GetInstance()->Stop();
  raise(SIGINT);
}

#ifdef __POSIX__
void* SigintWatchdogHelper::RunSigintWatchdog(void* arg) {
  // Inside the helper thread.
  bool is_stopping;

  do {
    uv_sem_wait(&instance.sem_);
    is_stopping = InformWatchdogsAboutSignal();
  } while (!is_stopping);

  return nullptr;
}

void SigintWatchdogHelper::HandleSignal(int signum,
                                        siginfo_t* info,
                                        void* ucontext) {
  uv_sem_post(&instance.sem_);
}

#else

// Windows starts a separate thread for executing the handler, so no extra
// helper thread is required.
BOOL WINAPI SigintWatchdogHelper::WinCtrlCHandlerRoutine(DWORD dwCtrlType) {
  if (!instance.watchdog_disabled_ &&
      (dwCtrlType == CTRL_C_EVENT || dwCtrlType == CTRL_BREAK_EVENT)) {
    InformWatchdogsAboutSignal();

    // Return true because the signal has been handled.
    return TRUE;
  } else {
    return FALSE;
  }
}
#endif


bool SigintWatchdogHelper::InformWatchdogsAboutSignal() {
  Mutex::ScopedLock list_lock(instance.list_mutex_);

  bool is_stopping = false;
#ifdef __POSIX__
  is_stopping = instance.stopping_;
#endif

  // If there are no listeners and the helper thread has been awoken by a signal
  // (= not when stopping it), indicate that by setting has_pending_signal_.
  if (instance.watchdogs_.empty() && !is_stopping) {
    instance.has_pending_signal_ = true;
  }

  for (auto it = instance.watchdogs_.rbegin(); it != instance.watchdogs_.rend();
       it++) {
    SignalPropagation wp = (*it)->HandleSigint();
    if (wp == SignalPropagation::kStopPropagation) {
      break;
    }
  }

  return is_stopping;
}


int SigintWatchdogHelper::Start() {
  Mutex::ScopedLock lock(mutex_);

  if (start_stop_count_++ > 0) {
    return 0;
  }

#ifdef __POSIX__
  CHECK_EQ(has_running_thread_, false);
  has_pending_signal_ = false;
  stopping_ = false;

  sigset_t sigmask;
  sigfillset(&sigmask);
  sigset_t savemask;
  CHECK_EQ(0, pthread_sigmask(SIG_SETMASK, &sigmask, &savemask));
  sigmask = savemask;
  int ret = pthread_create(&thread_, nullptr, RunSigintWatchdog, nullptr);
  CHECK_EQ(0, pthread_sigmask(SIG_SETMASK, &sigmask, nullptr));
  if (ret != 0) {
    return ret;
  }
  has_running_thread_ = true;

  RegisterSignalHandler(SIGINT, HandleSignal);
#else
  if (watchdog_disabled_) {
    watchdog_disabled_ = false;
  } else {
    SetConsoleCtrlHandler(WinCtrlCHandlerRoutine, TRUE);
  }
#endif

  return 0;
}


bool SigintWatchdogHelper::Stop() {
  bool had_pending_signal;
  Mutex::ScopedLock lock(mutex_);

  {
    Mutex::ScopedLock list_lock(list_mutex_);

    had_pending_signal = has_pending_signal_;

    if (--start_stop_count_ > 0) {
      has_pending_signal_ = false;
      return had_pending_signal;
    }

#ifdef __POSIX__
    // Set stopping now because it's only protected by list_mutex_.
    stopping_ = true;
#endif

    watchdogs_.clear();
  }

#ifdef __POSIX__
  if (!has_running_thread_) {
    has_pending_signal_ = false;
    return had_pending_signal;
  }

  // Wake up the helper thread.
  uv_sem_post(&sem_);

  // Wait for the helper thread to finish.
  CHECK_EQ(0, pthread_join(thread_, nullptr));
  has_running_thread_ = false;

  RegisterSignalHandler(SIGINT, SignalExit, true);
#else
  watchdog_disabled_ = true;
#endif

  had_pending_signal = has_pending_signal_;
  has_pending_signal_ = false;

  return had_pending_signal;
}


bool SigintWatchdogHelper::HasPendingSignal() {
  Mutex::ScopedLock lock(list_mutex_);

  return has_pending_signal_;
}

void SigintWatchdogHelper::Register(SigintWatchdogBase* wd) {
  Mutex::ScopedLock lock(list_mutex_);

  watchdogs_.push_back(wd);
}

void SigintWatchdogHelper::Unregister(SigintWatchdogBase* wd) {
  Mutex::ScopedLock lock(list_mutex_);

  auto it = std::find(watchdogs_.begin(), watchdogs_.end(), wd);

  CHECK_NE(it, watchdogs_.end());
  watchdogs_.erase(it);
}


SigintWatchdogHelper::SigintWatchdogHelper()
    : start_stop_count_(0),
      has_pending_signal_(false) {
#ifdef __POSIX__
  has_running_thread_ = false;
  stopping_ = false;
  CHECK_EQ(0, uv_sem_init(&sem_, 0));
#else
  watchdog_disabled_ = false;
#endif
}


SigintWatchdogHelper::~SigintWatchdogHelper() {
  start_stop_count_ = 0;
  Stop();

#ifdef __POSIX__
  CHECK_EQ(has_running_thread_, false);
  uv_sem_destroy(&sem_);
#endif
}

SigintWatchdogHelper SigintWatchdogHelper::instance;

namespace watchdog {
static void Initialize(Local<Object> target,
                       Local<Value> unused,
                       Local<Context> context,
                       void* priv) {
  Environment* env = Environment::GetCurrent(context);
  TraceSigintWatchdog::Init(env, target);
}
}  // namespace watchdog

}  // namespace node

NODE_MODULE_CONTEXT_AWARE_INTERNAL(watchdog, node::watchdog::Initialize)


Generated by: GCOVR (Version 3.4)

Line	Branch	Exec	Source
1			// Copyright Joyent, Inc. and other Node contributors.
2			//
3			// Permission is hereby granted, free of charge, to any person obtaining a
4			// copy of this software and associated documentation files (the
5			// "Software"), to deal in the Software without restriction, including
6			// without limitation the rights to use, copy, modify, merge, publish,
7			// distribute, sublicense, and/or sell copies of the Software, and to permit
8			// persons to whom the Software is furnished to do so, subject to the
9			// following conditions:
10			//
11			// The above copyright notice and this permission notice shall be included
12			// in all copies or substantial portions of the Software.
13			//
14			// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15			// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16			// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
17			// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
18			// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
19			// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
20			// USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22			#include <algorithm>
23
24			#include "async_wrap-inl.h"
25			#include "debug_utils-inl.h"
26			#include "env-inl.h"
27			#include "node_errors.h"
28			#include "node_internals.h"
29			#include "node_watchdog.h"
30			#include "util-inl.h"
31
32			namespace node {
33
34			using v8::Context;
35			using v8::FunctionCallbackInfo;
36			using v8::FunctionTemplate;
37			using v8::Local;
38			using v8::Object;
39			using v8::Value;
40
41		18	Watchdog::Watchdog(v8::Isolate* isolate, uint64_t ms, bool* timed_out)
42		18	: isolate_(isolate), timed_out_(timed_out) {
43
44			int rc;
45		18	rc = uv_loop_init(&loop_);
46	✗✓	18	if (rc != 0) {
47			FatalError("node::Watchdog::Watchdog()",
48			"Failed to initialize uv loop.");
49			}
50
51		46	rc = uv_async_init(&loop_, &async_, [](uv_async_t* signal) {
52		5	Watchdog* w = ContainerOf(&Watchdog::async_, signal);
53		5	uv_stop(&w->loop_);
54		28	});
55
56	✗✓	18	CHECK_EQ(0, rc);
57
58		18	rc = uv_timer_init(&loop_, &timer_);
59	✗✓	18	CHECK_EQ(0, rc);
60
61		18	rc = uv_timer_start(&timer_, &Watchdog::Timer, ms, 0);
62	✗✓	18	CHECK_EQ(0, rc);
63
64		18	rc = uv_thread_create(&thread_, &Watchdog::Run, this);
65	✗✓	18	CHECK_EQ(0, rc);
66		18	}
67
68
69		36	Watchdog::~Watchdog() {
70		18	uv_async_send(&async_);
71		18	uv_thread_join(&thread_);
72
73		18	uv_close(reinterpret_cast<uv_handle_t*>(&async_), nullptr);
74
75			// UV_RUN_DEFAULT so that libuv has a chance to clean up.
76		18	uv_run(&loop_, UV_RUN_DEFAULT);
77
78		18	CheckedUvLoopClose(&loop_);
79		18	}
80
81
82		18	void Watchdog::Run(void* arg) {
83		18	Watchdog* wd = static_cast<Watchdog*>(arg);
84
85			// UV_RUN_DEFAULT the loop will be stopped either by the async or the
86			// timer handle.
87		18	uv_run(&wd->loop_, UV_RUN_DEFAULT);
88
89			// Loop ref count reaches zero when both handles are closed.
90			// Close the timer handle on this side and let ~Watchdog() close async_
91		18	uv_close(reinterpret_cast<uv_handle_t*>(&wd->timer_), nullptr);
92		18	}
93
94		13	void Watchdog::Timer(uv_timer_t* timer) {
95		13	Watchdog* w = ContainerOf(&Watchdog::timer_, timer);
96		13	*w->timed_out_ = true;
97		13	w->isolate()->TerminateExecution();
98		13	uv_stop(&w->loop_);
99		13	}
100
101
102		146	SigintWatchdog::SigintWatchdog(
103		146	v8::Isolate* isolate, bool* received_signal)
104		146	: isolate_(isolate), received_signal_(received_signal) {
105			// Register this watchdog with the global SIGINT/Ctrl+C listener.
106		146	SigintWatchdogHelper::GetInstance()->Register(this);
107			// Start the helper thread, if that has not already happened.
108		146	SigintWatchdogHelper::GetInstance()->Start();
109		146	}
110
111
112		286	SigintWatchdog::~SigintWatchdog() {
113		143	SigintWatchdogHelper::GetInstance()->Unregister(this);
114		143	SigintWatchdogHelper::GetInstance()->Stop();
115		143	}
116
117		10	SignalPropagation SigintWatchdog::HandleSigint() {
118		10	*received_signal_ = true;
119		10	isolate_->TerminateExecution();
120		10	return SignalPropagation::kStopPropagation;
121			}
122
123		2	void TraceSigintWatchdog::Init(Environment* env, Local<Object> target) {
124		2	Local<FunctionTemplate> constructor = env->NewFunctionTemplate(New);
125		6	constructor->InstanceTemplate()->SetInternalFieldCount(
126		2	TraceSigintWatchdog::kInternalFieldCount);
127			Local<v8::String> js_sigint_watch_dog =
128		2	FIXED_ONE_BYTE_STRING(env->isolate(), "TraceSigintWatchdog");
129		2	constructor->SetClassName(js_sigint_watch_dog);
130		4	constructor->Inherit(HandleWrap::GetConstructorTemplate(env));
131
132		2	env->SetProtoMethod(constructor, "start", Start);
133		2	env->SetProtoMethod(constructor, "stop", Stop);
134
135			target
136		4	->Set(env->context(),
137			js_sigint_watch_dog,
138		10	constructor->GetFunction(env->context()).ToLocalChecked())
139			.Check();
140		2	}
141
142		1	void TraceSigintWatchdog::New(const FunctionCallbackInfo<Value>& args) {
143			// This constructor should not be exposed to public javascript.
144			// Therefore we assert that we are not trying to call this as a
145			// normal function.
146	✗✓	1	CHECK(args.IsConstructCall());
147		1	Environment* env = Environment::GetCurrent(args);
148		1	new TraceSigintWatchdog(env, args.This());
149		1	}
150
151		2	void TraceSigintWatchdog::Start(const FunctionCallbackInfo<Value>& args) {
152			TraceSigintWatchdog* watchdog;
153	✗✓	2	ASSIGN_OR_RETURN_UNWRAP(&watchdog, args.Holder());
154			// Register this watchdog with the global SIGINT/Ctrl+C listener.
155	✓✗	2	SigintWatchdogHelper::GetInstance()->Register(watchdog);
156			// Start the helper thread, if that has not already happened.
157		2	int r = SigintWatchdogHelper::GetInstance()->Start();
158	✗✓	2	CHECK_EQ(r, 0);
159			}
160
161		2	void TraceSigintWatchdog::Stop(const FunctionCallbackInfo<Value>& args) {
162			TraceSigintWatchdog* watchdog;
163	✗✓	2	ASSIGN_OR_RETURN_UNWRAP(&watchdog, args.Holder());
164	✓✗	2	SigintWatchdogHelper::GetInstance()->Unregister(watchdog);
165		2	SigintWatchdogHelper::GetInstance()->Stop();
166			}
167
168		1	TraceSigintWatchdog::TraceSigintWatchdog(Environment* env, Local<Object> object)
169			: HandleWrap(env,
170			object,
171		1	reinterpret_cast<uv_handle_t*>(&handle_),
172		1	AsyncWrap::PROVIDER_SIGINTWATCHDOG) {
173		3	int r = uv_async_init(env->event_loop(), &handle_, [](uv_async_t* handle) {
174			TraceSigintWatchdog* watchdog =
175			ContainerOf(&TraceSigintWatchdog::handle_, handle);
176			watchdog->signal_flag_ = SignalFlags::FromIdle;
177			watchdog->HandleInterrupt();
178		2	});
179	✗✓	1	CHECK_EQ(r, 0);
180		1	uv_unref(reinterpret_cast<uv_handle_t*>(&handle_));
181		1	}
182
183			SignalPropagation TraceSigintWatchdog::HandleSigint() {
184			/**
185			* In case of uv loop polling, i.e. no JS currently running, activate the
186			* loop to run a piece of JS code to trigger interruption.
187			*/
188			CHECK_EQ(uv_async_send(&handle_), 0);
189			env()->isolate()->RequestInterrupt(
190			[](v8::Isolate* isolate, void* data) {
191			TraceSigintWatchdog* self = static_cast<TraceSigintWatchdog*>(data);
192			if (self->signal_flag_ == SignalFlags::None) {
193			self->signal_flag_ = SignalFlags::FromInterrupt;
194			}
195			self->HandleInterrupt();
196			},
197			this);
198			return SignalPropagation::kContinuePropagation;
199			}
200
201			void TraceSigintWatchdog::HandleInterrupt() {
202			// Do not nest interrupts.
203			if (interrupting) {
204			return;
205			}
206			interrupting = true;
207			if (signal_flag_ == SignalFlags::None) {
208			return;
209			}
210			Environment* env_ = env();
211			// FIXME: Before
212			// https://github.com/nodejs/node/pull/29207#issuecomment-527667993 get
213			// fixed, additional JavaScript code evaluation shall be prevented from
214			// running during interruption.
215			FPrintF(stderr,
216			"KEYBOARD_INTERRUPT: Script execution was interrupted by `SIGINT`\n");
217			if (signal_flag_ == SignalFlags::FromInterrupt) {
218			PrintStackTrace(env_->isolate(),
219			v8::StackTrace::CurrentStackTrace(
220			env_->isolate(), 10, v8::StackTrace::kDetailed));
221			}
222			signal_flag_ = SignalFlags::None;
223			interrupting = false;
224
225			SigintWatchdogHelper::GetInstance()->Unregister(this);
226			SigintWatchdogHelper::GetInstance()->Stop();
227			raise(SIGINT);
228			}
229
230			#ifdef __POSIX__
231		164	void* SigintWatchdogHelper::RunSigintWatchdog(void* arg) {
232			// Inside the helper thread.
233			bool is_stopping;
234
235		13	do {
236		164	uv_sem_wait(&instance.sem_);
237		164	is_stopping = InformWatchdogsAboutSignal();
238	✓✓	164	} while (!is_stopping);
239
240		151	return nullptr;
241			}
242
243		13	void SigintWatchdogHelper::HandleSignal(int signum,
244			siginfo_t* info,
245			void* ucontext) {
246		13	uv_sem_post(&instance.sem_);
247		13	}
248
249			#else
250
251			// Windows starts a separate thread for executing the handler, so no extra
252			// helper thread is required.
253			BOOL WINAPI SigintWatchdogHelper::WinCtrlCHandlerRoutine(DWORD dwCtrlType) {
254			if (!instance.watchdog_disabled_ &&
255			(dwCtrlType == CTRL_C_EVENT \|\| dwCtrlType == CTRL_BREAK_EVENT)) {
256			InformWatchdogsAboutSignal();
257
258			// Return true because the signal has been handled.
259			return TRUE;
260			} else {
261			return FALSE;
262			}
263			}
264			#endif
265
266
267		164	bool SigintWatchdogHelper::InformWatchdogsAboutSignal() {
268		328	Mutex::ScopedLock list_lock(instance.list_mutex_);
269
270		164	bool is_stopping = false;
271			#ifdef __POSIX__
272		164	is_stopping = instance.stopping_;
273			#endif
274
275			// If there are no listeners and the helper thread has been awoken by a signal
276			// (= not when stopping it), indicate that by setting has_pending_signal_.
277	✓✓✓✓ ✓✓	164	if (instance.watchdogs_.empty() && !is_stopping) {
278		3	instance.has_pending_signal_ = true;
279			}
280
281	✓✓	164	for (auto it = instance.watchdogs_.rbegin(); it != instance.watchdogs_.rend();
282			it++) {
283		10	SignalPropagation wp = (*it)->HandleSigint();
284	✓✗	10	if (wp == SignalPropagation::kStopPropagation) {
285		10	break;
286			}
287			}
288
289		328	return is_stopping;
290			}
291
292
293		291	int SigintWatchdogHelper::Start() {
294		582	Mutex::ScopedLock lock(mutex_);
295
296	✓✓	291	if (start_stop_count_++ > 0) {
297		140	return 0;
298			}
299
300			#ifdef __POSIX__
301	✗✓	151	CHECK_EQ(has_running_thread_, false);
302		151	has_pending_signal_ = false;
303		151	stopping_ = false;
304
305			sigset_t sigmask;
306		151	sigfillset(&sigmask);
307			sigset_t savemask;
308	✗✓	151	CHECK_EQ(0, pthread_sigmask(SIG_SETMASK, &sigmask, &savemask));
309		151	sigmask = savemask;
310		151	int ret = pthread_create(&thread_, nullptr, RunSigintWatchdog, nullptr);
311	✗✓	151	CHECK_EQ(0, pthread_sigmask(SIG_SETMASK, &sigmask, nullptr));
312	✗✓	151	if (ret != 0) {
313			return ret;
314			}
315		151	has_running_thread_ = true;
316
317		151	RegisterSignalHandler(SIGINT, HandleSignal);
318			#else
319			if (watchdog_disabled_) {
320			watchdog_disabled_ = false;
321			} else {
322			SetConsoleCtrlHandler(WinCtrlCHandlerRoutine, TRUE);
323			}
324			#endif
325
326		151	return 0;
327			}
328
329
330		4963	bool SigintWatchdogHelper::Stop() {
331			bool had_pending_signal;
332		9926	Mutex::ScopedLock lock(mutex_);
333
334			{
335		9789	Mutex::ScopedLock list_lock(list_mutex_);
336
337		4963	had_pending_signal = has_pending_signal_;
338
339	✓✓	4963	if (--start_stop_count_ > 0) {
340		137	has_pending_signal_ = false;
341		137	return had_pending_signal;
342			}
343
344			#ifdef __POSIX__
345			// Set stopping now because it's only protected by list_mutex_.
346		4826	stopping_ = true;
347			#endif
348
349	✓✓	4826	watchdogs_.clear();
350			}
351
352			#ifdef __POSIX__
353	✓✓	4826	if (!has_running_thread_) {
354		4675	has_pending_signal_ = false;
355		4675	return had_pending_signal;
356			}
357
358			// Wake up the helper thread.
359		151	uv_sem_post(&sem_);
360
361			// Wait for the helper thread to finish.
362	✗✓	151	CHECK_EQ(0, pthread_join(thread_, nullptr));
363		151	has_running_thread_ = false;
364
365		151	RegisterSignalHandler(SIGINT, SignalExit, true);
366			#else
367			watchdog_disabled_ = true;
368			#endif
369
370		151	had_pending_signal = has_pending_signal_;
371		151	has_pending_signal_ = false;
372
373		151	return had_pending_signal;
374			}
375
376
377		3	bool SigintWatchdogHelper::HasPendingSignal() {
378		6	Mutex::ScopedLock lock(list_mutex_);
379
380		6	return has_pending_signal_;
381			}
382
383		148	void SigintWatchdogHelper::Register(SigintWatchdogBase* wd) {
384		296	Mutex::ScopedLock lock(list_mutex_);
385
386		148	watchdogs_.push_back(wd);
387		148	}
388
389		145	void SigintWatchdogHelper::Unregister(SigintWatchdogBase* wd) {
390		290	Mutex::ScopedLock lock(list_mutex_);
391
392		145	auto it = std::find(watchdogs_.begin(), watchdogs_.end(), wd);
393
394	✗✓	145	CHECK_NE(it, watchdogs_.end());
395		145	watchdogs_.erase(it);
396		145	}
397
398
399		4678	SigintWatchdogHelper::SigintWatchdogHelper()
400			: start_stop_count_(0),
401		4678	has_pending_signal_(false) {
402			#ifdef __POSIX__
403		4678	has_running_thread_ = false;
404		4678	stopping_ = false;
405	✗✓	4678	CHECK_EQ(0, uv_sem_init(&sem_, 0));
406			#else
407			watchdog_disabled_ = false;
408			#endif
409		4678	}
410
411
412		9356	SigintWatchdogHelper::~SigintWatchdogHelper() {
413		4678	start_stop_count_ = 0;
414		4678	Stop();
415
416			#ifdef __POSIX__
417	✗✓	4678	CHECK_EQ(has_running_thread_, false);
418		4678	uv_sem_destroy(&sem_);
419			#endif
420		4678	}
421
422		4678	SigintWatchdogHelper SigintWatchdogHelper::instance;
423
424			namespace watchdog {
425		2	static void Initialize(Local<Object> target,
426			Local<Value> unused,
427			Local<Context> context,
428			void* priv) {
429		2	Environment* env = Environment::GetCurrent(context);
430		2	TraceSigintWatchdog::Init(env, target);
431		2	}
432			} // namespace watchdog
433
434			} // namespace node
435
436	✓✗✓✗	18704	NODE_MODULE_CONTEXT_AWARE_INTERNAL(watchdog, node::watchdog::Initialize)