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node_process_methods.cc
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node_process_methods.cc
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#include "async_wrap-inl.h"
#include "base_object-inl.h"
#include "debug_utils-inl.h"
#include "env-inl.h"
#include "memory_tracker-inl.h"
#include "node.h"
#include "node_errors.h"
#include "node_external_reference.h"
#include "node_internals.h"
#include "node_process-inl.h"
#include "util-inl.h"
#include "uv.h"
#include "v8-fast-api-calls.h"
#include "v8.h"
#include <vector>
#if HAVE_INSPECTOR
#include "inspector_io.h"
#endif
#include <climits> // PATH_MAX
#include <cstdio>
#if defined(_MSC_VER)
#include <direct.h>
#include <io.h>
#define umask _umask
typedef int mode_t;
#else
#include <pthread.h>
#include <sys/resource.h> // getrlimit, setrlimit
#include <termios.h> // tcgetattr, tcsetattr
#endif
namespace node {
using v8::Array;
using v8::ArrayBuffer;
using v8::CFunction;
using v8::Context;
using v8::Float64Array;
using v8::FunctionCallbackInfo;
using v8::HeapStatistics;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::NewStringType;
using v8::Number;
using v8::Object;
using v8::String;
using v8::Uint32;
using v8::Value;
namespace per_process {
Mutex umask_mutex;
} // namespace per_process
// Microseconds in a second, as a float, used in CPUUsage() below
#define MICROS_PER_SEC 1e6
// used in Hrtime() and Uptime() below
#define NANOS_PER_SEC 1000000000
static void Abort(const FunctionCallbackInfo<Value>& args) {
Abort();
}
// For internal testing only, not exposed to userland.
static void CauseSegfault(const FunctionCallbackInfo<Value>& args) {
// This should crash hard all platforms.
volatile void** d = static_cast<volatile void**>(nullptr);
*d = nullptr;
}
static void Chdir(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(env->owns_process_state());
CHECK_EQ(args.Length(), 1);
CHECK(args[0]->IsString());
Utf8Value path(env->isolate(), args[0]);
int err = uv_chdir(*path);
if (err) {
// Also include the original working directory, since that will usually
// be helpful information when debugging a `chdir()` failure.
char buf[PATH_MAX_BYTES];
size_t cwd_len = sizeof(buf);
uv_cwd(buf, &cwd_len);
return env->ThrowUVException(err, "chdir", nullptr, buf, *path);
}
}
inline Local<ArrayBuffer> get_fields_array_buffer(
const FunctionCallbackInfo<Value>& args,
size_t index,
size_t array_length) {
CHECK(args[index]->IsFloat64Array());
Local<Float64Array> arr = args[index].As<Float64Array>();
CHECK_EQ(arr->Length(), array_length);
return arr->Buffer();
}
// CPUUsage use libuv's uv_getrusage() this-process resource usage accessor,
// to access ru_utime (user CPU time used) and ru_stime (system CPU time used),
// which are uv_timeval_t structs (long tv_sec, long tv_usec).
// Returns those values as Float64 microseconds in the elements of the array
// passed to the function.
static void CPUUsage(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
uv_rusage_t rusage;
// Call libuv to get the values we'll return.
int err = uv_getrusage(&rusage);
if (err)
return env->ThrowUVException(err, "uv_getrusage");
// Get the double array pointer from the Float64Array argument.
Local<ArrayBuffer> ab = get_fields_array_buffer(args, 0, 2);
double* fields = static_cast<double*>(ab->GetBackingStore()->Data());
// Set the Float64Array elements to be user / system values in microseconds.
fields[0] = MICROS_PER_SEC * rusage.ru_utime.tv_sec + rusage.ru_utime.tv_usec;
fields[1] = MICROS_PER_SEC * rusage.ru_stime.tv_sec + rusage.ru_stime.tv_usec;
}
static void Cwd(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(env->has_run_bootstrapping_code());
char buf[PATH_MAX_BYTES];
size_t cwd_len = sizeof(buf);
int err = uv_cwd(buf, &cwd_len);
if (err)
return env->ThrowUVException(err, "uv_cwd");
Local<String> cwd = String::NewFromUtf8(env->isolate(),
buf,
NewStringType::kNormal,
cwd_len).ToLocalChecked();
args.GetReturnValue().Set(cwd);
}
static void Kill(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Local<Context> context = env->context();
if (args.Length() < 2) {
THROW_ERR_MISSING_ARGS(env, "Bad argument.");
}
int pid;
if (!args[0]->Int32Value(context).To(&pid)) return;
int sig;
if (!args[1]->Int32Value(context).To(&sig)) return;
uv_pid_t own_pid = uv_os_getpid();
if (sig > 0 &&
(pid == 0 || pid == -1 || pid == own_pid || pid == -own_pid) &&
!HasSignalJSHandler(sig)) {
// This is most likely going to terminate this process.
// It's not an exact method but it might be close enough.
RunAtExit(env);
}
int err = uv_kill(pid, sig);
args.GetReturnValue().Set(err);
}
static void Rss(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
size_t rss;
int err = uv_resident_set_memory(&rss);
if (err)
return env->ThrowUVException(err, "uv_resident_set_memory");
args.GetReturnValue().Set(static_cast<double>(rss));
}
static void MemoryUsage(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
// V8 memory usage
HeapStatistics v8_heap_stats;
isolate->GetHeapStatistics(&v8_heap_stats);
NodeArrayBufferAllocator* array_buffer_allocator =
env->isolate_data()->node_allocator();
// Get the double array pointer from the Float64Array argument.
Local<ArrayBuffer> ab = get_fields_array_buffer(args, 0, 5);
double* fields = static_cast<double*>(ab->GetBackingStore()->Data());
size_t rss;
int err = uv_resident_set_memory(&rss);
if (err)
return env->ThrowUVException(err, "uv_resident_set_memory");
fields[0] = static_cast<double>(rss);
fields[1] = static_cast<double>(v8_heap_stats.total_heap_size());
fields[2] = static_cast<double>(v8_heap_stats.used_heap_size());
fields[3] = static_cast<double>(v8_heap_stats.external_memory());
fields[4] =
array_buffer_allocator == nullptr
? 0
: static_cast<double>(array_buffer_allocator->total_mem_usage());
}
void RawDebug(const FunctionCallbackInfo<Value>& args) {
CHECK(args.Length() == 1 && args[0]->IsString() &&
"must be called with a single string");
Utf8Value message(args.GetIsolate(), args[0]);
FPrintF(stderr, "%s\n", message);
fflush(stderr);
}
static void Umask(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(env->has_run_bootstrapping_code());
CHECK_EQ(args.Length(), 1);
CHECK(args[0]->IsUndefined() || args[0]->IsUint32());
Mutex::ScopedLock scoped_lock(per_process::umask_mutex);
uint32_t old;
if (args[0]->IsUndefined()) {
old = umask(0);
umask(static_cast<mode_t>(old));
} else {
int oct = args[0].As<Uint32>()->Value();
old = umask(static_cast<mode_t>(oct));
}
args.GetReturnValue().Set(old);
}
static void Uptime(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
uv_update_time(env->event_loop());
double uptime =
static_cast<double>(uv_hrtime() - per_process::node_start_time);
Local<Number> result = Number::New(env->isolate(), uptime / NANOS_PER_SEC);
args.GetReturnValue().Set(result);
}
static void GetActiveRequests(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
std::vector<Local<Value>> request_v;
for (ReqWrapBase* req_wrap : *env->req_wrap_queue()) {
AsyncWrap* w = req_wrap->GetAsyncWrap();
if (w->persistent().IsEmpty())
continue;
request_v.emplace_back(w->GetOwner());
}
args.GetReturnValue().Set(
Array::New(env->isolate(), request_v.data(), request_v.size()));
}
static void GetActiveRequestsInfo(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
std::vector<Local<Value>> requests_info;
for (ReqWrapBase* req_wrap : *env->req_wrap_queue()) {
AsyncWrap* w = req_wrap->GetAsyncWrap();
if (w->persistent().IsEmpty()) continue;
requests_info.emplace_back(OneByteString(env->isolate(),
w->MemoryInfoName().c_str()));
}
args.GetReturnValue().Set(
Array::New(env->isolate(), requests_info.data(), requests_info.size()));
}
// Non-static, friend of HandleWrap. Could have been a HandleWrap method but
// implemented here for consistency with GetActiveRequests().
void GetActiveHandles(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
std::vector<Local<Value>> handle_v;
for (auto w : *env->handle_wrap_queue()) {
if (!HandleWrap::HasRef(w))
continue;
handle_v.emplace_back(w->GetOwner());
}
args.GetReturnValue().Set(
Array::New(env->isolate(), handle_v.data(), handle_v.size()));
}
void GetActiveHandlesInfo(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
std::vector<Local<Value>> handles_info;
for (HandleWrap* w : *env->handle_wrap_queue()) {
if (w->persistent().IsEmpty() || !HandleWrap::HasRef(w)) continue;
handles_info.emplace_back(OneByteString(env->isolate(),
w->MemoryInfoName().c_str()));
}
args.GetReturnValue().Set(
Array::New(env->isolate(), handles_info.data(), handles_info.size()));
}
static void ResourceUsage(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
uv_rusage_t rusage;
int err = uv_getrusage(&rusage);
if (err)
return env->ThrowUVException(err, "uv_getrusage");
Local<ArrayBuffer> ab = get_fields_array_buffer(args, 0, 16);
double* fields = static_cast<double*>(ab->GetBackingStore()->Data());
fields[0] = MICROS_PER_SEC * rusage.ru_utime.tv_sec + rusage.ru_utime.tv_usec;
fields[1] = MICROS_PER_SEC * rusage.ru_stime.tv_sec + rusage.ru_stime.tv_usec;
fields[2] = static_cast<double>(rusage.ru_maxrss);
fields[3] = static_cast<double>(rusage.ru_ixrss);
fields[4] = static_cast<double>(rusage.ru_idrss);
fields[5] = static_cast<double>(rusage.ru_isrss);
fields[6] = static_cast<double>(rusage.ru_minflt);
fields[7] = static_cast<double>(rusage.ru_majflt);
fields[8] = static_cast<double>(rusage.ru_nswap);
fields[9] = static_cast<double>(rusage.ru_inblock);
fields[10] = static_cast<double>(rusage.ru_oublock);
fields[11] = static_cast<double>(rusage.ru_msgsnd);
fields[12] = static_cast<double>(rusage.ru_msgrcv);
fields[13] = static_cast<double>(rusage.ru_nsignals);
fields[14] = static_cast<double>(rusage.ru_nvcsw);
fields[15] = static_cast<double>(rusage.ru_nivcsw);
}
#ifdef __POSIX__
static void DebugProcess(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1) {
return THROW_ERR_MISSING_ARGS(env, "Invalid number of arguments.");
}
CHECK(args[0]->IsNumber());
pid_t pid = args[0].As<Integer>()->Value();
int r = kill(pid, SIGUSR1);
if (r != 0) {
return env->ThrowErrnoException(errno, "kill");
}
}
#endif // __POSIX__
#ifdef _WIN32
static int GetDebugSignalHandlerMappingName(DWORD pid,
wchar_t* buf,
size_t buf_len) {
return _snwprintf(buf, buf_len, L"node-debug-handler-%u", pid);
}
static void DebugProcess(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
if (args.Length() < 1) {
return THROW_ERR_MISSING_ARGS(env, "Invalid number of arguments.");
}
HANDLE process = nullptr;
HANDLE thread = nullptr;
HANDLE mapping = nullptr;
wchar_t mapping_name[32];
LPTHREAD_START_ROUTINE* handler = nullptr;
DWORD pid = 0;
auto cleanup = OnScopeLeave([&]() {
if (process != nullptr) CloseHandle(process);
if (thread != nullptr) CloseHandle(thread);
if (handler != nullptr) UnmapViewOfFile(handler);
if (mapping != nullptr) CloseHandle(mapping);
});
CHECK(args[0]->IsNumber());
pid = static_cast<DWORD>(args[0].As<Integer>()->Value());
process =
OpenProcess(PROCESS_CREATE_THREAD | PROCESS_QUERY_INFORMATION |
PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_VM_READ,
FALSE,
pid);
if (process == nullptr) {
isolate->ThrowException(
WinapiErrnoException(isolate, GetLastError(), "OpenProcess"));
return;
}
if (GetDebugSignalHandlerMappingName(
pid, mapping_name, arraysize(mapping_name)) < 0) {
env->ThrowErrnoException(errno, "sprintf");
return;
}
mapping = OpenFileMappingW(FILE_MAP_READ, FALSE, mapping_name);
if (mapping == nullptr) {
isolate->ThrowException(
WinapiErrnoException(isolate, GetLastError(), "OpenFileMappingW"));
return;
}
handler = reinterpret_cast<LPTHREAD_START_ROUTINE*>(
MapViewOfFile(mapping, FILE_MAP_READ, 0, 0, sizeof *handler));
if (handler == nullptr || *handler == nullptr) {
isolate->ThrowException(
WinapiErrnoException(isolate, GetLastError(), "MapViewOfFile"));
return;
}
thread =
CreateRemoteThread(process, nullptr, 0, *handler, nullptr, 0, nullptr);
if (thread == nullptr) {
isolate->ThrowException(
WinapiErrnoException(isolate, GetLastError(), "CreateRemoteThread"));
return;
}
// Wait for the thread to terminate
if (WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0) {
isolate->ThrowException(
WinapiErrnoException(isolate, GetLastError(), "WaitForSingleObject"));
return;
}
}
#endif // _WIN32
static void DebugEnd(const FunctionCallbackInfo<Value>& args) {
#if HAVE_INSPECTOR
Environment* env = Environment::GetCurrent(args);
if (env->inspector_agent()->IsListening()) {
env->inspector_agent()->Stop();
}
#endif
}
static void ReallyExit(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
RunAtExit(env);
int code = args[0]->Int32Value(env->context()).FromMaybe(0);
env->Exit(code);
}
namespace process {
BindingData::BindingData(Environment* env, v8::Local<v8::Object> object)
: SnapshotableObject(env, object, type_int) {
Local<ArrayBuffer> ab = ArrayBuffer::New(env->isolate(), kBufferSize);
array_buffer_.Reset(env->isolate(), ab);
object
->Set(env->context(),
FIXED_ONE_BYTE_STRING(env->isolate(), "hrtimeBuffer"),
ab)
.ToChecked();
backing_store_ = ab->GetBackingStore();
}
v8::CFunction BindingData::fast_number_(v8::CFunction::Make(FastNumber));
v8::CFunction BindingData::fast_bigint_(v8::CFunction::Make(FastBigInt));
void BindingData::AddMethods() {
env()->SetFastMethod(object(), "hrtime", SlowNumber, &fast_number_);
env()->SetFastMethod(object(), "hrtimeBigInt", SlowBigInt, &fast_bigint_);
}
void BindingData::RegisterExternalReferences(
ExternalReferenceRegistry* registry) {
registry->Register(SlowNumber);
registry->Register(SlowBigInt);
registry->Register(FastNumber);
registry->Register(FastBigInt);
registry->Register(fast_number_.GetTypeInfo());
registry->Register(fast_bigint_.GetTypeInfo());
}
BindingData* BindingData::FromV8Value(Local<Value> value) {
Local<Object> v8_object = value.As<Object>();
return static_cast<BindingData*>(
v8_object->GetAlignedPointerFromInternalField(BaseObject::kSlot));
}
void BindingData::MemoryInfo(MemoryTracker* tracker) const {
tracker->TrackField("array_buffer", array_buffer_);
}
// This is the legacy version of hrtime before BigInt was introduced in
// JavaScript.
// The value returned by uv_hrtime() is a 64-bit int representing nanoseconds,
// so this function instead fills in an Uint32Array with 3 entries,
// to avoid any integer overflow possibility.
// The first two entries contain the second part of the value
// broken into the upper/lower 32 bits to be converted back in JS,
// because there is no Uint64Array in JS.
// The third entry contains the remaining nanosecond part of the value.
void BindingData::NumberImpl(BindingData* receiver) {
// Make sure we don't accidentally access buffers wiped for snapshot.
CHECK(!receiver->array_buffer_.IsEmpty());
uint64_t t = uv_hrtime();
uint32_t* fields = static_cast<uint32_t*>(receiver->backing_store_->Data());
fields[0] = (t / NANOS_PER_SEC) >> 32;
fields[1] = (t / NANOS_PER_SEC) & 0xffffffff;
fields[2] = t % NANOS_PER_SEC;
}
void BindingData::BigIntImpl(BindingData* receiver) {
// Make sure we don't accidentally access buffers wiped for snapshot.
CHECK(!receiver->array_buffer_.IsEmpty());
uint64_t t = uv_hrtime();
uint64_t* fields = static_cast<uint64_t*>(receiver->backing_store_->Data());
fields[0] = t;
}
void BindingData::SlowBigInt(const FunctionCallbackInfo<Value>& args) {
BigIntImpl(FromJSObject<BindingData>(args.Holder()));
}
void BindingData::SlowNumber(const v8::FunctionCallbackInfo<v8::Value>& args) {
NumberImpl(FromJSObject<BindingData>(args.Holder()));
}
void BindingData::PrepareForSerialization(Local<Context> context,
v8::SnapshotCreator* creator) {
// It's not worth keeping.
// Release it, we will recreate it when the instance is dehydrated.
array_buffer_.Reset();
}
InternalFieldInfo* BindingData::Serialize(int index) {
DCHECK_EQ(index, BaseObject::kSlot);
InternalFieldInfo* info = InternalFieldInfo::New(type());
return info;
}
void BindingData::Deserialize(Local<Context> context,
Local<Object> holder,
int index,
InternalFieldInfo* info) {
DCHECK_EQ(index, BaseObject::kSlot);
v8::HandleScope scope(context->GetIsolate());
Environment* env = Environment::GetCurrent(context);
// Recreate the buffer in the constructor.
BindingData* binding = env->AddBindingData<BindingData>(context, holder);
CHECK_NOT_NULL(binding);
}
static void Initialize(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void* priv) {
Environment* env = Environment::GetCurrent(context);
BindingData* const binding_data =
env->AddBindingData<BindingData>(context, target);
if (binding_data == nullptr) return;
binding_data->AddMethods();
// define various internal methods
if (env->owns_process_state()) {
env->SetMethod(target, "_debugProcess", DebugProcess);
env->SetMethod(target, "_debugEnd", DebugEnd);
env->SetMethod(target, "abort", Abort);
env->SetMethod(target, "causeSegfault", CauseSegfault);
env->SetMethod(target, "chdir", Chdir);
}
env->SetMethod(target, "umask", Umask);
env->SetMethod(target, "_rawDebug", RawDebug);
env->SetMethod(target, "memoryUsage", MemoryUsage);
env->SetMethod(target, "rss", Rss);
env->SetMethod(target, "cpuUsage", CPUUsage);
env->SetMethod(target, "resourceUsage", ResourceUsage);
env->SetMethod(target, "_getActiveRequests", GetActiveRequests);
env->SetMethod(target, "_getActiveRequestsInfo", GetActiveRequestsInfo);
env->SetMethod(target, "_getActiveHandles", GetActiveHandles);
env->SetMethod(target, "_getActiveHandlesInfo", GetActiveHandlesInfo);
env->SetMethod(target, "_kill", Kill);
env->SetMethodNoSideEffect(target, "cwd", Cwd);
env->SetMethod(target, "dlopen", binding::DLOpen);
env->SetMethod(target, "reallyExit", ReallyExit);
env->SetMethodNoSideEffect(target, "uptime", Uptime);
env->SetMethod(target, "patchProcessObject", PatchProcessObject);
}
void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
BindingData::RegisterExternalReferences(registry);
registry->Register(DebugProcess);
registry->Register(DebugEnd);
registry->Register(Abort);
registry->Register(CauseSegfault);
registry->Register(Chdir);
registry->Register(Umask);
registry->Register(RawDebug);
registry->Register(MemoryUsage);
registry->Register(Rss);
registry->Register(CPUUsage);
registry->Register(ResourceUsage);
registry->Register(GetActiveRequests);
registry->Register(GetActiveRequestsInfo);
registry->Register(GetActiveHandles);
registry->Register(GetActiveHandlesInfo);
registry->Register(Kill);
registry->Register(Cwd);
registry->Register(binding::DLOpen);
registry->Register(ReallyExit);
registry->Register(Uptime);
registry->Register(PatchProcessObject);
}
} // namespace process
} // namespace node
NODE_MODULE_CONTEXT_AWARE_INTERNAL(process_methods, node::process::Initialize)
NODE_MODULE_EXTERNAL_REFERENCE(process_methods,
node::process::RegisterExternalReferences)