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// 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 "async_wrap-inl.h"
#include "env-inl.h"
#include "handle_wrap.h"
#include "node_external_reference.h"
#include "node_process-inl.h"
#include "util-inl.h"
#include "v8.h"
namespace node {
using v8::Context;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Integer;
using v8::Local;
using v8::Object;
using v8::Value;
void DecreaseSignalHandlerCount(int signum);
namespace {
static Mutex handled_signals_mutex;
static std::map<int, int64_t> handled_signals; // Signal -> number of handlers
class SignalWrap : public HandleWrap {
public:
static void Initialize(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void* priv) {
Environment* env = Environment::GetCurrent(context);
Local<FunctionTemplate> constructor = env->NewFunctionTemplate(New);
constructor->InstanceTemplate()->SetInternalFieldCount(
SignalWrap::kInternalFieldCount);
constructor->Inherit(HandleWrap::GetConstructorTemplate(env));
env->SetProtoMethod(constructor, "start", Start);
env->SetProtoMethod(constructor, "stop", Stop);
env->SetConstructorFunction(target, "Signal", constructor);
}
static void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
registry->Register(New);
registry->Register(Start);
registry->Register(Stop);
}
SET_NO_MEMORY_INFO()
SET_MEMORY_INFO_NAME(SignalWrap)
SET_SELF_SIZE(SignalWrap)
private:
static void 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 SignalWrap(env, args.This());
}
SignalWrap(Environment* env, Local<Object> object)
: HandleWrap(env,
object,
reinterpret_cast<uv_handle_t*>(&handle_),
AsyncWrap::PROVIDER_SIGNALWRAP) {
int r = uv_signal_init(env->event_loop(), &handle_);
CHECK_EQ(r, 0);
}
void Close(v8::Local<v8::Value> close_callback) override {
if (active_) {
DecreaseSignalHandlerCount(handle_.signum);
active_ = false;
}
HandleWrap::Close(close_callback);
}
static void Start(const FunctionCallbackInfo<Value>& args) {
SignalWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
Environment* env = wrap->env();
int signum;
if (!args[0]->Int32Value(env->context()).To(&signum)) return;
#if defined(__POSIX__) && HAVE_INSPECTOR
if (signum == SIGPROF) {
Environment* env = Environment::GetCurrent(args);
if (env->inspector_agent()->IsListening()) {
ProcessEmitWarning(env,
"process.on(SIGPROF) is reserved while debugging");
return;
}
}
#endif
int err = uv_signal_start(
&wrap->handle_,
[](uv_signal_t* handle, int signum) {
SignalWrap* wrap = ContainerOf(&SignalWrap::handle_, handle);
Environment* env = wrap->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
Local<Value> arg = Integer::New(env->isolate(), signum);
wrap->MakeCallback(env->onsignal_string(), 1, &arg);
},
signum);
if (err == 0) {
CHECK(!wrap->active_);
wrap->active_ = true;
Mutex::ScopedLock lock(handled_signals_mutex);
handled_signals[signum]++;
}
args.GetReturnValue().Set(err);
}
static void Stop(const FunctionCallbackInfo<Value>& args) {
SignalWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
if (wrap->active_) {
wrap->active_ = false;
DecreaseSignalHandlerCount(wrap->handle_.signum);
}
int err = uv_signal_stop(&wrap->handle_);
args.GetReturnValue().Set(err);
}
uv_signal_t handle_;
bool active_ = false;
};
} // anonymous namespace
void DecreaseSignalHandlerCount(int signum) {
Mutex::ScopedLock lock(handled_signals_mutex);
int64_t new_handler_count = --handled_signals[signum];
CHECK_GE(new_handler_count, 0);
if (new_handler_count == 0)
handled_signals.erase(signum);
}
bool HasSignalJSHandler(int signum) {
Mutex::ScopedLock lock(handled_signals_mutex);
return handled_signals.find(signum) != handled_signals.end();
}
} // namespace node
NODE_MODULE_CONTEXT_AWARE_INTERNAL(signal_wrap, node::SignalWrap::Initialize)
NODE_MODULE_EXTERNAL_REFERENCE(signal_wrap,
node::SignalWrap::RegisterExternalReferences)
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