#include "spawn_sync.h"

#include "env-inl.h"

#include "string_bytes.h"

#include "util.h"

#include <string.h>

#include <stdlib.h>

namespace node {

using v8::Array;

using v8::Context;

using v8::EscapableHandleScope;

using v8::FunctionCallbackInfo;

using v8::HandleScope;

using v8::Integer;

using v8::Isolate;

using v8::Local;

using v8::Null;

using v8::Number;

using v8::Object;

using v8::String;

using v8::Value;

SyncProcessOutputBuffer::SyncProcessOutputBuffer()

: used_(0),

next_(nullptr) {

}

void SyncProcessOutputBuffer::OnAlloc(size_t suggested_size,

uv_buf_t* buf) const {

if (used() == kBufferSize)

*buf = uv_buf_init(nullptr, 0);

else

*buf = uv_buf_init(data_ + used(), available());

}

void SyncProcessOutputBuffer::OnRead(const uv_buf_t* buf, size_t nread) {

// If we hand out the same chunk twice, this should catch it.

CHECK_EQ(buf->base, data_ + used());

used_ += static_cast<unsigned int>(nread);

}

size_t SyncProcessOutputBuffer::Copy(char* dest) const {

memcpy(dest, data_, used());

return used();

}

unsigned int SyncProcessOutputBuffer::available() const {

return sizeof data_ - used();

}

unsigned int SyncProcessOutputBuffer::used() const {

return used_;

}

SyncProcessOutputBuffer* SyncProcessOutputBuffer::next() const {

return next_;

}

void SyncProcessOutputBuffer::set_next(SyncProcessOutputBuffer* next) {

next_ = next;

}

SyncProcessStdioPipe::SyncProcessStdioPipe(SyncProcessRunner* process_handler,

bool readable,

bool writable,

uv_buf_t input_buffer)

: process_handler_(process_handler),

readable_(readable),

writable_(writable),

input_buffer_(input_buffer),

first_output_buffer_(nullptr),

last_output_buffer_(nullptr),

uv_pipe_(),

write_req_(),

shutdown_req_(),

lifecycle_(kUninitialized) {

CHECK(readable || writable);

}

SyncProcessStdioPipe::~SyncProcessStdioPipe() {

CHECK(lifecycle_ == kUninitialized || lifecycle_ == kClosed);

SyncProcessOutputBuffer* buf;

SyncProcessOutputBuffer* next;

for (buf = first_output_buffer_; buf != nullptr; buf = next) {

next = buf->next();

delete buf;

}

}

int SyncProcessStdioPipe::Initialize(uv_loop_t* loop) {

CHECK_EQ(lifecycle_, kUninitialized);

int r = uv_pipe_init(loop, uv_pipe(), 0);

if (r < 0)

return r;

uv_pipe()->data = this;

lifecycle_ = kInitialized;

return 0;

}

int SyncProcessStdioPipe::Start() {

CHECK_EQ(lifecycle_, kInitialized);

// Set the busy flag already. If this function fails no recovery is

// possible.

lifecycle_ = kStarted;

if (readable()) {

if (input_buffer_.len > 0) {

CHECK_NE(input_buffer_.base, nullptr);

int r = uv_write(&write_req_,

uv_stream(),

&input_buffer_,

1,

WriteCallback);

if (r < 0)

return r;

}

int r = uv_shutdown(&shutdown_req_, uv_stream(), ShutdownCallback);

if (r < 0)

return r;

}

if (writable()) {

int r = uv_read_start(uv_stream(), AllocCallback, ReadCallback);

if (r < 0)

return r;

}

return 0;

}

void SyncProcessStdioPipe::Close() {

CHECK(lifecycle_ == kInitialized || lifecycle_ == kStarted);

uv_close(uv_handle(), CloseCallback);

lifecycle_ = kClosing;

}

Local<Object> SyncProcessStdioPipe::GetOutputAsBuffer(Environment* env) const {

size_t length = OutputLength();

Local<Object> js_buffer = Buffer::New(env, length).ToLocalChecked();

CopyOutput(Buffer::Data(js_buffer));

return js_buffer;

}

bool SyncProcessStdioPipe::readable() const {

return readable_;

}

bool SyncProcessStdioPipe::writable() const {

return writable_;

}

uv_stdio_flags SyncProcessStdioPipe::uv_flags() const {

unsigned int flags;

flags = UV_CREATE_PIPE;

if (readable())

flags |= UV_READABLE_PIPE;

if (writable())

flags |= UV_WRITABLE_PIPE;

return static_cast<uv_stdio_flags>(flags);

}

uv_pipe_t* SyncProcessStdioPipe::uv_pipe() const {

CHECK_LT(lifecycle_, kClosing);

return &uv_pipe_;

}

uv_stream_t* SyncProcessStdioPipe::uv_stream() const {

return reinterpret_cast<uv_stream_t*>(uv_pipe());

}

uv_handle_t* SyncProcessStdioPipe::uv_handle() const {

return reinterpret_cast<uv_handle_t*>(uv_pipe());

}

size_t SyncProcessStdioPipe::OutputLength() const {

SyncProcessOutputBuffer* buf;

size_t size = 0;

for (buf = first_output_buffer_; buf != nullptr; buf = buf->next())

size += buf->used();

return size;

}

void SyncProcessStdioPipe::CopyOutput(char* dest) const {

SyncProcessOutputBuffer* buf;

size_t offset = 0;

for (buf = first_output_buffer_; buf != nullptr; buf = buf->next())

offset += buf->Copy(dest + offset);

}

void SyncProcessStdioPipe::OnAlloc(size_t suggested_size, uv_buf_t* buf) {

// This function assumes that libuv will never allocate two buffers for the

// same stream at the same time. There's an assert in

// SyncProcessOutputBuffer::OnRead that would fail if this assumption was

// ever violated.

if (last_output_buffer_ == nullptr) {

// Allocate the first capture buffer.

first_output_buffer_ = new SyncProcessOutputBuffer();

last_output_buffer_ = first_output_buffer_;

} else if (last_output_buffer_->available() == 0) {

// The current capture buffer is full so get us a new one.

SyncProcessOutputBuffer* buf = new SyncProcessOutputBuffer();

last_output_buffer_->set_next(buf);

last_output_buffer_ = buf;

}

last_output_buffer_->OnAlloc(suggested_size, buf);

}

void SyncProcessStdioPipe::OnRead(const uv_buf_t* buf, ssize_t nread) {

if (nread == UV_EOF) {

// Libuv implicitly stops reading on EOF.

} else if (nread < 0) {

SetError(static_cast<int>(nread));

// At some point libuv should really implicitly stop reading on error.

uv_read_stop(uv_stream());

} else {

last_output_buffer_->OnRead(buf, nread);

process_handler_->IncrementBufferSizeAndCheckOverflow(nread);

}

}

void SyncProcessStdioPipe::OnWriteDone(int result) {

if (result < 0)

SetError(result);

}

void SyncProcessStdioPipe::OnShutdownDone(int result) {

if (result < 0)

SetError(result);

}

void SyncProcessStdioPipe::OnClose() {

lifecycle_ = kClosed;

}

void SyncProcessStdioPipe::SetError(int error) {

CHECK_NE(error, 0);

process_handler_->SetPipeError(error);

}

void SyncProcessStdioPipe::AllocCallback(uv_handle_t* handle,

size_t suggested_size,

uv_buf_t* buf) {

SyncProcessStdioPipe* self =

reinterpret_cast<SyncProcessStdioPipe*>(handle->data);

self->OnAlloc(suggested_size, buf);

}

void SyncProcessStdioPipe::ReadCallback(uv_stream_t* stream,

ssize_t nread,

const uv_buf_t* buf) {

SyncProcessStdioPipe* self =

reinterpret_cast<SyncProcessStdioPipe*>(stream->data);

self->OnRead(buf, nread);

}

void SyncProcessStdioPipe::WriteCallback(uv_write_t* req, int result) {

SyncProcessStdioPipe* self =

reinterpret_cast<SyncProcessStdioPipe*>(req->handle->data);

self->OnWriteDone(result);

}

void SyncProcessStdioPipe::ShutdownCallback(uv_shutdown_t* req, int result) {

SyncProcessStdioPipe* self =

reinterpret_cast<SyncProcessStdioPipe*>(req->handle->data);

// On AIX, OS X and the BSDs, calling shutdown() on one end of a pipe

// when the other end has closed the connection fails with ENOTCONN.

// Libuv is not the right place to handle that because it can't tell

// if the error is genuine but we here can.

if (result == UV_ENOTCONN)

result = 0;

self->OnShutdownDone(result);

}

void SyncProcessStdioPipe::CloseCallback(uv_handle_t* handle) {

SyncProcessStdioPipe* self =

reinterpret_cast<SyncProcessStdioPipe*>(handle->data);

self->OnClose();

}

void SyncProcessRunner::Initialize(Local<Object> target,

Local<Value> unused,

Local<Context> context) {

Environment* env = Environment::GetCurrent(context);

env->SetMethod(target, "spawn", Spawn);

}

void SyncProcessRunner::Spawn(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

env->PrintSyncTrace();

SyncProcessRunner p(env);

Local<Value> result = p.Run(args[0]);

args.GetReturnValue().Set(result);

}

SyncProcessRunner::SyncProcessRunner(Environment* env)

: max_buffer_(0),

timeout_(0),

kill_signal_(SIGTERM),

uv_loop_(nullptr),

stdio_count_(0),

uv_stdio_containers_(nullptr),

stdio_pipes_(nullptr),

stdio_pipes_initialized_(false),

uv_process_options_(),

file_buffer_(nullptr),

args_buffer_(nullptr),

env_buffer_(nullptr),

cwd_buffer_(nullptr),

uv_process_(),

killed_(false),

buffered_output_size_(0),

exit_status_(-1),

term_signal_(-1),

uv_timer_(),

kill_timer_initialized_(false),

error_(0),

pipe_error_(0),

lifecycle_(kUninitialized),

env_(env) {

}

SyncProcessRunner::~SyncProcessRunner() {

CHECK_EQ(lifecycle_, kHandlesClosed);

if (stdio_pipes_ != nullptr) {

for (size_t i = 0; i < stdio_count_; i++) {

if (stdio_pipes_[i] != nullptr)

delete stdio_pipes_[i];

}

}

delete[] stdio_pipes_;

delete[] file_buffer_;

delete[] args_buffer_;

delete[] cwd_buffer_;

delete[] env_buffer_;

delete[] uv_stdio_containers_;

}

Environment* SyncProcessRunner::env() const {

return env_;

}

Local<Object> SyncProcessRunner::Run(Local<Value> options) {

EscapableHandleScope scope(env()->isolate());

CHECK_EQ(lifecycle_, kUninitialized);

TryInitializeAndRunLoop(options);

CloseHandlesAndDeleteLoop();

Local<Object> result = BuildResultObject();

return scope.Escape(result);

}

void SyncProcessRunner::TryInitializeAndRunLoop(Local<Value> options) {

int r;

// There is no recovery from failure inside TryInitializeAndRunLoop - the

// only option we'd have is to close all handles and destroy the loop.

CHECK_EQ(lifecycle_, kUninitialized);

lifecycle_ = kInitialized;

uv_loop_ = new uv_loop_t;

if (uv_loop_ == nullptr)

return SetError(UV_ENOMEM);

CHECK_EQ(uv_loop_init(uv_loop_), 0);

r = ParseOptions(options);

if (r < 0)

return SetError(r);

if (timeout_ > 0) {

r = uv_timer_init(uv_loop_, &uv_timer_);

if (r < 0)

return SetError(r);

uv_unref(reinterpret_cast<uv_handle_t*>(&uv_timer_));

uv_timer_.data = this;

kill_timer_initialized_ = true;

// Start the timer immediately. If uv_spawn fails then

// CloseHandlesAndDeleteLoop() will immediately close the timer handle

// which implicitly stops it, so there is no risk that the timeout callback

// runs when the process didn't start.

r = uv_timer_start(&uv_timer_, KillTimerCallback, timeout_, 0);

if (r < 0)

return SetError(r);

}

uv_process_options_.exit_cb = ExitCallback;

r = uv_spawn(uv_loop_, &uv_process_, &uv_process_options_);

if (r < 0)

return SetError(r);

uv_process_.data = this;

for (uint32_t i = 0; i < stdio_count_; i++) {

SyncProcessStdioPipe* h = stdio_pipes_[i];

if (h != nullptr) {

r = h->Start();

if (r < 0)

return SetPipeError(r);

}

}

r = uv_run(uv_loop_, UV_RUN_DEFAULT);

if (r < 0)

// We can't handle uv_run failure.

ABORT();

// If we get here the process should have exited.

CHECK_GE(exit_status_, 0);

}

void SyncProcessRunner::CloseHandlesAndDeleteLoop() {

CHECK_LT(lifecycle_, kHandlesClosed);

if (uv_loop_ != nullptr) {

CloseStdioPipes();

CloseKillTimer();

// Close the process handle when ExitCallback was not called.

uv_handle_t* uv_process_handle =

reinterpret_cast<uv_handle_t*>(&uv_process_);

if (!uv_is_closing(uv_process_handle))

uv_close(uv_process_handle, nullptr);

// Give closing watchers a chance to finish closing and get their close

// callbacks called.

int r = uv_run(uv_loop_, UV_RUN_DEFAULT);

if (r < 0)

ABORT();

CHECK_EQ(uv_loop_close(uv_loop_), 0);

delete uv_loop_;

uv_loop_ = nullptr;

} else {

// If the loop doesn't exist, neither should any pipes or timers.

CHECK_EQ(false, stdio_pipes_initialized_);

CHECK_EQ(false, kill_timer_initialized_);

}

lifecycle_ = kHandlesClosed;

}

void SyncProcessRunner::CloseStdioPipes() {

CHECK_LT(lifecycle_, kHandlesClosed);

if (stdio_pipes_initialized_) {

CHECK_NE(stdio_pipes_, nullptr);

CHECK_NE(uv_loop_, nullptr);

for (uint32_t i = 0; i < stdio_count_; i++) {

if (stdio_pipes_[i] != nullptr)

stdio_pipes_[i]->Close();

}

stdio_pipes_initialized_ = false;

}

}

void SyncProcessRunner::CloseKillTimer() {

CHECK_LT(lifecycle_, kHandlesClosed);

if (kill_timer_initialized_) {

CHECK_GT(timeout_, 0);

CHECK_NE(uv_loop_, nullptr);

uv_handle_t* uv_timer_handle = reinterpret_cast<uv_handle_t*>(&uv_timer_);

uv_ref(uv_timer_handle);

uv_close(uv_timer_handle, KillTimerCloseCallback);

kill_timer_initialized_ = false;

}

}

void SyncProcessRunner::Kill() {

// Only attempt to kill once.

if (killed_)

return;

killed_ = true;

// We might get here even if the process we spawned has already exited. This

// could happen when our child process spawned another process which

// inherited (one of) the stdio pipes. In this case we won't attempt to send

// a signal to the process, however we will still close our end of the stdio

// pipes so this situation won't make us hang.

if (exit_status_ < 0) {

int r = uv_process_kill(&uv_process_, kill_signal_);

// If uv_kill failed with an error that isn't ESRCH, the user probably

// specified an invalid or unsupported signal. Signal this to the user as

// and error and kill the process with SIGKILL instead.

if (r < 0 && r != UV_ESRCH) {

SetError(r);

r = uv_process_kill(&uv_process_, SIGKILL);

CHECK(r >= 0 || r == UV_ESRCH);

}

}

// Close all stdio pipes.

CloseStdioPipes();

// Stop the timeout timer immediately.

CloseKillTimer();

}

void SyncProcessRunner::IncrementBufferSizeAndCheckOverflow(ssize_t length) {

buffered_output_size_ += length;

if (max_buffer_ > 0 && buffered_output_size_ > max_buffer_) {

SetError(UV_ENOBUFS);

Kill();

}

}

void SyncProcessRunner::OnExit(int64_t exit_status, int term_signal) {

if (exit_status < 0)

return SetError(static_cast<int>(exit_status));

exit_status_ = exit_status;

term_signal_ = term_signal;

}

void SyncProcessRunner::OnKillTimerTimeout() {

SetError(UV_ETIMEDOUT);

Kill();

}

int SyncProcessRunner::GetError() {

if (error_ != 0)

return error_;

else

return pipe_error_;

}

void SyncProcessRunner::SetError(int error) {

if (error_ == 0)

error_ = error;

}

void SyncProcessRunner::SetPipeError(int pipe_error) {

if (pipe_error_ == 0)

pipe_error_ = pipe_error;

}

Local<Object> SyncProcessRunner::BuildResultObject() {

EscapableHandleScope scope(env()->isolate());

Local<Object> js_result = Object::New(env()->isolate());

if (GetError() != 0) {

js_result->Set(env()->error_string(),

Integer::New(env()->isolate(), GetError()));

}

if (exit_status_ >= 0) {

if (term_signal_ > 0) {

js_result->Set(env()->status_string(), Null(env()->isolate()));

} else {

js_result->Set(env()->status_string(),

Number::New(env()->isolate(), static_cast<double>(exit_status_)));

}

} else {

// If exit_status_ < 0 the process was never started because of some error.

js_result->Set(env()->status_string(), Null(env()->isolate()));

}

if (term_signal_ > 0)

js_result->Set(env()->signal_string(),

String::NewFromUtf8(env()->isolate(), signo_string(term_signal_)));

else

js_result->Set(env()->signal_string(), Null(env()->isolate()));

if (exit_status_ >= 0)

js_result->Set(env()->output_string(), BuildOutputArray());

else

js_result->Set(env()->output_string(), Null(env()->isolate()));

js_result->Set(env()->pid_string(),

Number::New(env()->isolate(), uv_process_.pid));

return scope.Escape(js_result);

}

Local<Array> SyncProcessRunner::BuildOutputArray() {

CHECK_GE(lifecycle_, kInitialized);

CHECK_NE(stdio_pipes_, nullptr);

EscapableHandleScope scope(env()->isolate());

Local<Array> js_output = Array::New(env()->isolate(), stdio_count_);

for (uint32_t i = 0; i < stdio_count_; i++) {

SyncProcessStdioPipe* h = stdio_pipes_[i];

if (h != nullptr && h->writable())

js_output->Set(i, h->GetOutputAsBuffer(env()));

else

js_output->Set(i, Null(env()->isolate()));

}

return scope.Escape(js_output);

}

int SyncProcessRunner::ParseOptions(Local<Value> js_value) {

HandleScope scope(env()->isolate());

int r;

if (!js_value->IsObject())

return UV_EINVAL;

Local<Object> js_options = js_value.As<Object>();

Local<Value> js_file = js_options->Get(env()->file_string());

r = CopyJsString(js_file, &file_buffer_);

if (r < 0)

return r;

uv_process_options_.file = file_buffer_;

Local<Value> js_args = js_options->Get(env()->args_string());

r = CopyJsStringArray(js_args, &args_buffer_);

if (r < 0)

return r;

uv_process_options_.args = reinterpret_cast<char**>(args_buffer_);

Local<Value> js_cwd = js_options->Get(env()->cwd_string());

if (IsSet(js_cwd)) {

r = CopyJsString(js_cwd, &cwd_buffer_);

if (r < 0)

return r;

uv_process_options_.cwd = cwd_buffer_;

}

Local<Value> js_env_pairs = js_options->Get(env()->env_pairs_string());

if (IsSet(js_env_pairs)) {

r = CopyJsStringArray(js_env_pairs, &env_buffer_);

if (r < 0)

return r;

uv_process_options_.env = reinterpret_cast<char**>(env_buffer_);

}

Local<Value> js_uid = js_options->Get(env()->uid_string());

if (IsSet(js_uid)) {

if (!js_uid->IsInt32())

return UV_EINVAL;

const int32_t uid = js_uid->Int32Value(env()->context()).FromJust();

uv_process_options_.uid = static_cast<uv_uid_t>(uid);

uv_process_options_.flags |= UV_PROCESS_SETUID;

}

Local<Value> js_gid = js_options->Get(env()->gid_string());

if (IsSet(js_gid)) {

if (!js_gid->IsInt32())

return UV_EINVAL;

const int32_t gid = js_gid->Int32Value(env()->context()).FromJust();

uv_process_options_.gid = static_cast<uv_gid_t>(gid);

uv_process_options_.flags |= UV_PROCESS_SETGID;

}

if (js_options->Get(env()->detached_string())->BooleanValue())

uv_process_options_.flags |= UV_PROCESS_DETACHED;

Local<String> wba = env()->windows_verbatim_arguments_string();

if (js_options->Get(wba)->BooleanValue())

uv_process_options_.flags |= UV_PROCESS_WINDOWS_VERBATIM_ARGUMENTS;

Local<Value> js_timeout = js_options->Get(env()->timeout_string());

if (IsSet(js_timeout)) {

if (!js_timeout->IsNumber())

return UV_EINVAL;

int64_t timeout = js_timeout->IntegerValue();

if (timeout < 0)

return UV_EINVAL;

timeout_ = static_cast<uint64_t>(timeout);

}

Local<Value> js_max_buffer = js_options->Get(env()->max_buffer_string());

if (IsSet(js_max_buffer)) {

if (!js_max_buffer->IsUint32())

return UV_EINVAL;

max_buffer_ = js_max_buffer->Uint32Value();

}

Local<Value> js_kill_signal = js_options->Get(env()->kill_signal_string());

if (IsSet(js_kill_signal)) {

if (!js_kill_signal->IsInt32())

return UV_EINVAL;

kill_signal_ = js_kill_signal->Int32Value();

if (kill_signal_ == 0)

return UV_EINVAL;

}

Local<Value> js_stdio = js_options->Get(env()->stdio_string());

r = ParseStdioOptions(js_stdio);

if (r < 0)

return r;

return 0;

}

int SyncProcessRunner::ParseStdioOptions(Local<Value> js_value) {

HandleScope scope(env()->isolate());

Local<Array> js_stdio_options;

if (!js_value->IsArray())

return UV_EINVAL;

js_stdio_options = js_value.As<Array>();

stdio_count_ = js_stdio_options->Length();

uv_stdio_containers_ = new uv_stdio_container_t[stdio_count_];

stdio_pipes_ = new SyncProcessStdioPipe*[stdio_count_]();

stdio_pipes_initialized_ = true;

for (uint32_t i = 0; i < stdio_count_; i++) {

Local<Value> js_stdio_option = js_stdio_options->Get(i);

if (!js_stdio_option->IsObject())

return UV_EINVAL;

int r = ParseStdioOption(i, js_stdio_option.As<Object>());

if (r < 0)

return r;

}

uv_process_options_.stdio = uv_stdio_containers_;

uv_process_options_.stdio_count = stdio_count_;

return 0;

}

int SyncProcessRunner::ParseStdioOption(int child_fd,

Local<Object> js_stdio_option) {

Local<Value> js_type = js_stdio_option->Get(env()->type_string());

if (js_type->StrictEquals(env()->ignore_string())) {

return AddStdioIgnore(child_fd);

} else if (js_type->StrictEquals(env()->pipe_string())) {

Local<String> rs = env()->readable_string();

Local<String> ws = env()->writable_string();

bool readable = js_stdio_option->Get(rs)->BooleanValue();

bool writable = js_stdio_option->Get(ws)->BooleanValue();

uv_buf_t buf = uv_buf_init(nullptr, 0);

if (readable) {

Local<Value> input = js_stdio_option->Get(env()->input_string());

if (Buffer::HasInstance(input)) {

buf = uv_buf_init(Buffer::Data(input),

static_cast<unsigned int>(Buffer::Length(input)));

} else if (!input->IsUndefined() && !input->IsNull()) {

// Strings, numbers etc. are currently unsupported. It's not possible

// to create a buffer for them here because there is no way to free

// them afterwards.

return UV_EINVAL;

}

}

return AddStdioPipe(child_fd, readable, writable, buf);

} else if (js_type->StrictEquals(env()->inherit_string()) ||

js_type->StrictEquals(env()->fd_string())) {

int inherit_fd = js_stdio_option->Get(env()->fd_string())->Int32Value();

return AddStdioInheritFD(child_fd, inherit_fd);

} else {

CHECK(0 && "invalid child stdio type");

return UV_EINVAL;

}

}

int SyncProcessRunner::AddStdioIgnore(uint32_t child_fd) {

CHECK_LT(child_fd, stdio_count_);

CHECK_EQ(stdio_pipes_[child_fd], nullptr);

uv_stdio_containers_[child_fd].flags = UV_IGNORE;

return 0;

}

int SyncProcessRunner::AddStdioPipe(uint32_t child_fd,

bool readable,

bool writable,

uv_buf_t input_buffer) {

CHECK_LT(child_fd, stdio_count_);

CHECK_EQ(stdio_pipes_[child_fd], nullptr);

SyncProcessStdioPipe* h = new SyncProcessStdioPipe(this,

readable,

writable,

input_buffer);

int r = h->Initialize(uv_loop_);

if (r < 0) {

delete h;

return r;

}

stdio_pipes_[child_fd] = h;

uv_stdio_containers_[child_fd].flags = h->uv_flags();

uv_stdio_containers_[child_fd].data.stream = h->uv_stream();

return 0;

}

int SyncProcessRunner::AddStdioInheritFD(uint32_t child_fd, int inherit_fd) {

CHECK_LT(child_fd, stdio_count_);

CHECK_EQ(stdio_pipes_[child_fd], nullptr);

uv_stdio_containers_[child_fd].flags = UV_INHERIT_FD;

uv_stdio_containers_[child_fd].data.fd = inherit_fd;

return 0;

}

bool SyncProcessRunner::IsSet(Local<Value> value) {

return !value->IsUndefined() && !value->IsNull();

}

int SyncProcessRunner::CopyJsString(Local<Value> js_value,

const char** target) {

Isolate* isolate = env()->isolate();

Local<String> js_string;

size_t size, written;

char* buffer;

if (js_value->IsString())

js_string = js_value.As<String>();

else

js_string = js_value->ToString(env()->isolate());

// Include space for null terminator byte.

size = StringBytes::StorageSize(isolate, js_string, UTF8) + 1;

buffer = new char[size];

written = StringBytes::Write(isolate, buffer, -1, js_string, UTF8);

buffer[written] = '\0';

*target = buffer;

return 0;

}

int SyncProcessRunner::CopyJsStringArray(Local<Value> js_value,

char** target) {

Isolate* isolate = env()->isolate();

Local<Array> js_array;

uint32_t length;

size_t list_size, data_size, data_offset;

char** list;

char* buffer;

if (!js_value->IsArray())

return UV_EINVAL;

js_array = js_value.As<Array>()->Clone().As<Array>();

length = js_array->Length();

// Convert all array elements to string. Modify the js object itself if

// needed - it's okay since we cloned the original object.

for (uint32_t i = 0; i < length; i++) {

if (!js_array->Get(i)->IsString())

js_array->Set(i, js_array->Get(i)->ToString(env()->isolate()));

}

// Index has a pointer to every string element, plus one more for a final

// null pointer.

list_size = (length + 1) * sizeof *list;

// Compute the length of all strings. Include room for null terminator

// after every string. Align strings to cache lines.

data_size = 0;

for (uint32_t i = 0; i < length; i++) {

data_size += StringBytes::StorageSize(isolate, js_array->Get(i), UTF8) + 1;

data_size = ROUND_UP(data_size, sizeof(void*));

}

buffer = new char[list_size + data_size];

list = reinterpret_cast<char**>(buffer);

data_offset = list_size;

for (uint32_t i = 0; i < length; i++) {

list[i] = buffer + data_offset;

data_offset += StringBytes::Write(isolate,

buffer + data_offset,

-1,

js_array->Get(i),

UTF8);

buffer[data_offset++] = '\0';

data_offset = ROUND_UP(data_offset, sizeof(void*));

}

list[length] = nullptr;