Method startProcess

PIMELauncher/BackendServer.cpp:143–205

}

void BackendServer::startProcess() {
	process_ = new uv_process_t{};
	// create pipes for stdio of the child process
    stdoutPipe_ = createStdoutPipe();
    stdoutReadBuf_.clear();
    stdinPipe_ = createStdinPipe();
    stderrPipe_ = createStderrPipe();

    constexpr auto pipeFlags = uv_stdio_flags(UV_CREATE_PIPE | UV_READABLE_PIPE | UV_WRITABLE_PIPE);
	uv_stdio_container_t stdio_containers[3];
    stdio_containers[0].data.stream = stdinPipe_->streamHandle();
	stdio_containers[0].flags = pipeFlags;
    stdio_containers[1].data.stream = stdoutPipe_->streamHandle();
	stdio_containers[1].flags = pipeFlags;
    stdio_containers[2].data.stream = stderrPipe_->streamHandle();
	stdio_containers[2].flags = pipeFlags;

    auto utf8CurrentDirPath = getUtf8CurrentDir();
    auto executablePath = utf8CurrentDirPath + '\\' + command_;
	const char* argv[] = {
        executablePath.c_str(),
		params_.c_str(),
		nullptr
	};
	uv_process_options_t options = { 0 };
	options.flags = UV_PROCESS_WINDOWS_HIDE; //  UV_PROCESS_WINDOWS_VERBATIM_ARGUMENTS;
    options.file = executablePath.c_str();
	options.args = const_cast<char**>(argv);

    auto backendWorkingDirPath = utf8CurrentDirPath + '\\' + workingDir_;
	options.cwd = backendWorkingDirPath.c_str();

	// build our own new environments
    auto utf8EnvVars = getUtf8EnvironmentVariables();
	// add our own environment variables
	// NOTE: Force python to output UTF-8 encoded strings
	// Reference: https://docs.python.org/3/using/cmdline.html#envvar-PYTHONIOENCODING
	// By default, python uses ANSI encoding in Windows and this breaks our unicode support.
	// FIXME: makes this configurable from backend.json.
	utf8EnvVars.emplace_back("PYTHONIOENCODING=utf-8:ignore");

    // convert to a null terminated char* array.
	std::vector<const char*> env;
	for (auto& v : utf8EnvVars) {
		env.emplace_back(v.c_str());
	}
	env.emplace_back(nullptr);
	options.env = const_cast<char**>(env.data());

	options.stdio_count = 3;
	options.stdio = stdio_containers;
	int ret = uv_spawn(uv_default_loop(), process_, &options);
	if (ret < 0) {
		delete process_;
		process_ = nullptr;
		closeStdioPipes();
		return;
	}