Fix macos fork crash in run action

Should make it easier to combine docks into a single dock window without
having to know the exact dock window titles beforehand

data/locale/en-US.ini

@@ -986,6 +986,7 @@ AdvSceneSwitcher.action.playAudio.monitorUnavailable="Audio monitoring not avail
 AdvSceneSwitcher.action.playAudio.tracks="Tracks"
 AdvSceneSwitcher.action.playAudio.layout.startOffset="{{useStartOffset}}Start at{{startOffset}}"
 AdvSceneSwitcher.action.playAudio.layout.playbackDuration="{{useDuration}}Play for{{playbackDuration}}(0 = until end)"
+AdvSceneSwitcher.action.playAudio.mono="Mono"
 AdvSceneSwitcher.action.recording="Recording"
 AdvSceneSwitcher.action.recording.type.stop="Stop recording"
 AdvSceneSwitcher.action.recording.type.start="Start recording"

lib/queue/action-queue.cpp

@@ -420,11 +420,10 @@ static bool queueWithNameExists(const std::string &name)
 	return !GetWeakActionQueueByName(name).expired();
 }
 
-static void signalImportedQueues(void *varsPtr)
+static void
+signalImportedQueues(const std::vector<std::shared_ptr<Item>> &queues)
 {
-	auto queues = std::unique_ptr<std::vector<std::shared_ptr<Item>>>(
-		static_cast<std::vector<std::shared_ptr<Item>> *>(varsPtr));
-	for (const auto &queue : *queues) {
+	for (const auto &queue : queues) {
 		ActionQueueSignalManager::Instance()->Add(
 			QString::fromStdString(queue->Name()));
 	}
@@ -436,7 +435,7 @@ void ImportQueues(obs_data_t *data)
 		obs_data_get_array(data, "actionQueues");
 	size_t count = obs_data_array_count(array);
 
-	auto importedQueues = new std::vector<std::shared_ptr<Item>>;
+	std::vector<std::shared_ptr<Item>> importedQueues;
 
 	for (size_t i = 0; i < count; i++) {
 		OBSDataAutoRelease arrayElement = obs_data_array_item(array, i);
@@ -446,10 +445,11 @@ void ImportQueues(obs_data_t *data)
 			continue;
 		}
 		queues.emplace_back(queue);
-		importedQueues->emplace_back(queue);
+		importedQueues.emplace_back(queue);
 	}
 
-	QueueUITask(signalImportedQueues, importedQueues);
+	QueueUITask(
+		[importedQueues]() { signalImportedQueues(importedQueues); });
 }
 
 std::weak_ptr<ActionQueue> GetWeakActionQueueByName(const std::string &name)

lib/utils/temp-variable.cpp

@@ -734,12 +734,10 @@ TempVarSignalManager *TempVarSignalManager::Instance()
 void NotifyUIAboutTempVarChange(MacroSegment *segment)
 {
 	IncrementTempVarInUseGeneration();
-	QueueUITask(
-		[](void *segment) {
-			TempVarSignalManager::Instance()->SegmentTempVarsChanged(
-				(MacroSegment *)segment);
-		},
-		segment);
+	QueueUITask([segment]() {
+		TempVarSignalManager::Instance()->SegmentTempVarsChanged(
+			segment);
+	});
 }
 
 TempVarOutputMappingsWidget::TempVarOutputMappingsWidget(QWidget *parent)

lib/utils/ui-helpers.cpp

@@ -184,9 +184,9 @@ std::string GetThemeTypeName()
 #endif
 }
 
-void QueueUITask(void (*task)(void *param), void *param)
+void QueueUITaskRaw(void (*task)(void *param), void *param, bool wait)
 {
-	obs_queue_task(OBS_TASK_UI, task, param, false);
+	obs_queue_task(OBS_TASK_UI, task, param, wait);
 }
 
 bool IsCursorInWidgetArea(QWidget *widget)

lib/utils/ui-helpers.hpp

@@ -6,7 +6,10 @@
 #include <QIcon>
 #include <QString>
 
+#include <memory>
 #include <string>
+#include <type_traits>
+#include <utility>
 
 class QAbstractButton;
 class QComboBox;
@@ -38,7 +41,23 @@ EXPORT void DisplayTrayMessage(const QString &title, const QString &msg,
 EXPORT std::string GetThemeTypeName();
 EXPORT QWidget *GetSettingsWindow();
 
-EXPORT void QueueUITask(void (*task)(void *param), void *param);
+EXPORT void QueueUITaskRaw(void (*task)(void *param), void *param,
+			   bool wait = false);
+
+// Runs func on the main/UI thread; blocks if wait is true.
+template<typename F> void QueueUITask(F &&func, bool wait = false)
+{
+	using FnType = std::decay_t<F>;
+	auto *heapFunc = new FnType(std::forward<F>(func));
+
+	QueueUITaskRaw(
+		[](void *param) {
+			std::unique_ptr<FnType> fn(
+				static_cast<FnType *>(param));
+			(*fn)();
+		},
+		heapFunc, wait);
+}
 
 bool IsCursorInWidgetArea(QWidget *widget);
 

lib/variables/variable.cpp

@@ -504,11 +504,10 @@ void LoadVariables(obs_data_t *obj)
 	}
 }
 
-static void signalImportedVariables(void *varsPtr)
+static void
+signalImportedVariables(const std::vector<std::shared_ptr<Item>> &vars)
 {
-	auto vars = std::unique_ptr<std::vector<std::shared_ptr<Item>>>(
-		static_cast<std::vector<std::shared_ptr<Item>> *>(varsPtr));
-	for (const auto &var : *vars) {
+	for (const auto &var : vars) {
 		VariableSignalManager::Instance()->Add(
 			QString::fromStdString(var->Name()));
 	}
@@ -519,7 +518,7 @@ void ImportVariables(obs_data_t *data)
 	OBSDataArrayAutoRelease array = obs_data_get_array(data, "variables");
 	size_t count = obs_data_array_count(array);
 
-	auto importedVars = new std::vector<std::shared_ptr<Item>>;
+	std::vector<std::shared_ptr<Item>> importedVars;
 
 	for (size_t i = 0; i < count; i++) {
 		OBSDataAutoRelease arrayElement = obs_data_array_item(array, i);
@@ -531,10 +530,11 @@ void ImportVariables(obs_data_t *data)
 		}
 
 		GetVariables().emplace_back(var);
-		importedVars->emplace_back(var);
+		importedVars.emplace_back(var);
 	}
 
-	QueueUITask(signalImportedVariables, importedVars);
+	QueueUITask(
+		[importedVars]() { signalImportedVariables(importedVars); });
 }
 
 std::chrono::high_resolution_clock::time_point GetLastVariableChangeTime()

plugins/base/macro-action-play-audio.cpp

@@ -2,18 +2,64 @@
 #include "audio-helpers.hpp"
 #include "layout-helpers.hpp"
 #include "macro-helpers.hpp"
+#include "plugin-state-helpers.hpp"
 #include "sync-helpers.hpp"
 
+#include <obs-frontend-api.h>
+
 #include <chrono>
+#include <mutex>
+#include <set>
 #include <QFileInfo>
 #include <QLabel>
 
 namespace advss {
 
-// Use a high output channel index that is unlikely to be claimed by OBS or
-// other plugins. OBS supports channels 0-63; channel 0 is the main scene.
 static constexpr uint32_t kPlaybackOutputChannel = 63;
 
+// Tracks rawSource handles held by background cleanup threads so they can be
+// stopped early when OBS begins shutdown, before audio is freed.
+static std::mutex g_activeSourcesMutex;
+static std::set<obs_source_t *> g_activeSources;
+
+static void registerActiveSource(obs_source_t *source)
+{
+	std::lock_guard<std::mutex> lock(g_activeSourcesMutex);
+	g_activeSources.insert(source);
+}
+
+static void unregisterActiveSource(obs_source_t *source)
+{
+	std::lock_guard<std::mutex> lock(g_activeSourcesMutex);
+	g_activeSources.erase(source);
+}
+
+static void stopAllActiveSources()
+{
+	std::lock_guard<std::mutex> lock(g_activeSourcesMutex);
+	for (auto *source : g_activeSources) {
+		obs_source_media_stop(source);
+	}
+}
+
+static void handleObsEvent(enum obs_frontend_event event, void *)
+{
+	if (event == OBS_FRONTEND_EVENT_SCRIPTING_SHUTDOWN ||
+	    event == OBS_FRONTEND_EVENT_EXIT) {
+		stopAllActiveSources();
+	}
+}
+
+static bool setup()
+{
+	AddPluginPostLoadStep([]() {
+		obs_frontend_add_event_callback(handleObsEvent, nullptr);
+	});
+	return true;
+}
+
+static bool setupDone = setup();
+
 const std::string MacroActionPlayAudio::id = "play_audio";
 
 bool MacroActionPlayAudio::_registered = MacroActionFactory::Register(
@@ -23,6 +69,7 @@ bool MacroActionPlayAudio::_registered = MacroActionFactory::Register(
 
 static void deactivatePlayback(obs_source_t *source, bool wantsOutput)
 {
+	obs_source_media_stop(source);
 	if (wantsOutput) {
 		obs_set_output_source(kPlaybackOutputChannel, nullptr);
 	} else {
@@ -38,8 +85,7 @@ static void waitForPlaybackToEnd(Macro *macro, obs_source_t *source,
 	std::unique_lock<std::mutex> lock(*GetMutex());
 	SetMacroAbortWait(false);
 
-	// The media source needs time to open and decode before reaching
-	// PLAYING state. Poll until it starts (or the macro is stopped).
+	// Poll until the source starts playing or the macro is stopped.
 	while (!MacroWaitShouldAbort() && !MacroIsStopped(macro)) {
 		if (obs_source_media_get_state(source) ==
 		    OBS_MEDIA_STATE_PLAYING) {
@@ -48,9 +94,8 @@ static void waitForPlaybackToEnd(Macro *macro, obs_source_t *source,
 		GetMacroWaitCV().wait_for(lock, 10ms);
 	}
 
-	// Now wait for playback to end. Require two consecutive non-playing
-	// samples to avoid false positives on brief state transitions.
-	// If maxMs > 0, also stop once that many milliseconds have elapsed.
+	// Wait for playback to end. Two consecutive non-playing samples are
+	// required to avoid false positives on brief state transitions.
 	const auto playbackStart = std::chrono::steady_clock::now();
 	static const int kStopThreshold = 2;
 	int stoppedCount = 0;
@@ -95,7 +140,6 @@ bool MacroActionPlayAudio::PerformAction()
 	obs_data_set_string(settings, "local_file", path.c_str());
 	obs_data_set_bool(settings, "is_local_file", true);
 	obs_data_set_bool(settings, "looping", false);
-	// Disable automatic restart on activate so we control start explicitly.
 	obs_data_set_bool(settings, "restart_on_activate", false);
 	obs_data_set_bool(settings, "close_when_inactive", true);
 
@@ -113,10 +157,11 @@ bool MacroActionPlayAudio::PerformAction()
 		DecibelToPercent(static_cast<float>(_volumeDB.GetValue()));
 	obs_source_set_volume(source, vol);
 	obs_source_set_monitoring_type(source, _monitorType);
+	if (_mono) {
+		obs_source_set_flags(source, OBS_SOURCE_FLAG_FORCE_MONO);
+	}
 
-	// Fall back to monitor-only if all output tracks are deselected —
-	// there is no point routing through the output channel if the mixer
-	// mask would silence every track.
+	// Fall back to monitor-only if all output tracks are deselected.
 	const bool wantsOutput =
 		(_monitorType != OBS_MONITORING_TYPE_MONITOR_ONLY) &&
 		(_audioMixers != 0);
@@ -128,10 +173,8 @@ bool MacroActionPlayAudio::PerformAction()
 
 	if (wantsOutput) {
 		obs_source_set_audio_mixers(source, _audioMixers);
-		// Route through a private scene so we can position the scene
-		// item far off-screen. This keeps the item "visible" (so audio
-		// is still mixed) while ensuring its video never intersects the
-		// output frame.
+		// Route through a private scene positioned off-screen so the
+		// audio mixes into the output without video appearing on screen.
 		OBSSceneAutoRelease audioScene =
 			obs_scene_create_private("advss_audio_scene");
 		obs_sceneitem_t *item = obs_scene_add(audioScene, source);
@@ -141,8 +184,7 @@ bool MacroActionPlayAudio::PerformAction()
 		}
 		obs_set_output_source(kPlaybackOutputChannel,
 				      obs_scene_get_source(audioScene));
-		// audioScene released here; the output channel holds the
-		// remaining reference and keeps the scene alive.
+		// audioScene is released here; the output channel keeps the scene alive.
 	} else {
 		obs_source_set_audio_mixers(source, 0);
 		obs_source_inc_active(source);
@@ -167,15 +209,15 @@ bool MacroActionPlayAudio::PerformAction()
 		return true;
 	}
 
-	// Keep the source alive in a background thread that cleans up
-	// once playback finishes. Grab an extra strong reference so the
-	// source survives beyond this stack frame.
+	// Keep the source alive until playback ends via a background thread.
 	auto rawSource = obs_source_get_ref(source);
+	registerActiveSource(rawSource);
 	auto macro = GetMacro();
 
 	std::thread cleanupThread([rawSource, wantsOutput, macro, maxMs]() {
 		waitForPlaybackToEnd(macro, rawSource, maxMs);
 		deactivatePlayback(rawSource, wantsOutput);
+		unregisterActiveSource(rawSource);
 		obs_source_release(rawSource);
 	});
 	AddMacroHelperThread(macro, std::move(cleanupThread));
@@ -204,6 +246,7 @@ bool MacroActionPlayAudio::Save(obs_data_t *obj) const
 	obs_data_set_bool(obj, "useDuration", _useDuration);
 	_playbackDuration.Save(obj, "playbackDuration");
 	obs_data_set_bool(obj, "waitForCompletion", _waitForCompletion);
+	obs_data_set_bool(obj, "mono", _mono);
 	return true;
 }
 
@@ -221,6 +264,7 @@ bool MacroActionPlayAudio::Load(obs_data_t *obj)
 	_useDuration = obs_data_get_bool(obj, "useDuration");
 	_playbackDuration.Load(obj, "playbackDuration");
 	_waitForCompletion = obs_data_get_bool(obj, "waitForCompletion");
+	_mono = obs_data_get_bool(obj, "mono");
 	return true;
 }
 
@@ -262,7 +306,9 @@ MacroActionPlayAudioEdit::MacroActionPlayAudioEdit(
 	  _useDuration(new QCheckBox(this)),
 	  _playbackDuration(new DurationSelection(this, true, 0.0)),
 	  _waitForCompletion(new QCheckBox(
-		  obs_module_text("AdvSceneSwitcher.action.playAudio.wait")))
+		  obs_module_text("AdvSceneSwitcher.action.playAudio.wait"))),
+	  _mono(new QCheckBox(
+		  obs_module_text("AdvSceneSwitcher.action.playAudio.mono")))
 {
 	_volumeDB->setMinimum(-100.0);
 	_volumeDB->setMaximum(0.0);
@@ -303,6 +349,8 @@ MacroActionPlayAudioEdit::MacroActionPlayAudioEdit(
 			 SLOT(PlaybackDurationChanged(const Duration &)));
 	QWidget::connect(_waitForCompletion, SIGNAL(stateChanged(int)), this,
 			 SLOT(WaitChanged(int)));
+	QWidget::connect(_mono, SIGNAL(stateChanged(int)), this,
+			 SLOT(MonoChanged(int)));
 
 	auto tracksLayout = new QHBoxLayout;
 	tracksLayout->setContentsMargins(0, 0, 0, 0);
@@ -346,6 +394,7 @@ MacroActionPlayAudioEdit::MacroActionPlayAudioEdit(
 	mainLayout->addLayout(startOffsetLayout);
 	mainLayout->addLayout(playbackDurationLayout);
 	mainLayout->addWidget(_waitForCompletion);
+	mainLayout->addWidget(_mono);
 	setLayout(mainLayout);
 
 	_entryData = entryData;
@@ -375,6 +424,7 @@ void MacroActionPlayAudioEdit::UpdateEntryData()
 	_playbackDuration->SetDuration(_entryData->_playbackDuration);
 	_playbackDuration->setEnabled(_entryData->_useDuration);
 	_waitForCompletion->setChecked(_entryData->_waitForCompletion);
+	_mono->setChecked(_entryData->_mono);
 }
 
 void MacroActionPlayAudioEdit::FilePathChanged(const QString &path)
@@ -443,4 +493,10 @@ void MacroActionPlayAudioEdit::WaitChanged(int value)
 	_entryData->_waitForCompletion = value;
 }
 
+void MacroActionPlayAudioEdit::MonoChanged(int value)
+{
+	GUARD_LOADING_AND_LOCK();
+	_entryData->_mono = value;
+}
+
 } // namespace advss

plugins/base/macro-action-play-audio.hpp

@@ -37,6 +37,7 @@ public:
 	bool _useDuration = false;
 	Duration _playbackDuration;
 	bool _waitForCompletion = false;
+	bool _mono = false;
 
 	static bool _registered;
 	static const std::string id;
@@ -68,6 +69,7 @@ private slots:
 	void UseDurationChanged(int);
 	void PlaybackDurationChanged(const Duration &);
 	void WaitChanged(int value);
+	void MonoChanged(int value);
 
 signals:
 	void HeaderInfoChanged(const QString &);
@@ -83,6 +85,7 @@ private:
 	QCheckBox *_useDuration;
 	DurationSelection *_playbackDuration;
 	QCheckBox *_waitForCompletion;
+	QCheckBox *_mono;
 
 	std::shared_ptr<MacroActionPlayAudio> _entryData;
 	bool _loading = true;

plugins/base/macro-action-scene-collection.cpp

@@ -17,20 +17,6 @@ bool MacroActionSceneCollection::_registered = MacroActionFactory::Register(
 	 MacroActionSceneCollectionEdit::Create,
 	 "AdvSceneSwitcher.action.sceneCollection"});
 
-template<typename F> void QueueUITaskLambda(F &&func)
-{
-	using FnType = std::decay_t<F>;
-	auto *heapFunc = new FnType(std::forward<F>(func));
-
-	QueueUITask(
-		[](void *param) {
-			std::unique_ptr<FnType> fn(
-				static_cast<FnType *>(param));
-			(*fn)();
-		},
-		heapFunc);
-}
-
 bool MacroActionSceneCollection::PerformAction()
 {
 	// Changing the scene collection will also reload the settings of the
@@ -41,7 +27,7 @@ bool MacroActionSceneCollection::PerformAction()
 	}
 
 	const auto collectionName = _sceneCollection;
-	QueueUITaskLambda([collectionName]() {
+	QueueUITask([collectionName]() {
 		obs_frontend_set_current_scene_collection(
 			collectionName.c_str());
 	});

plugins/base/macro-action-source.cpp

@@ -185,20 +185,6 @@ static void closeSourceDialog(obs_source_t *source, bool accept,
 	}
 }
 
-template<typename F> void QueueUITaskLambda(F &&func)
-{
-	using FnType = std::decay_t<F>;
-	auto *heapFunc = new FnType(std::forward<F>(func));
-
-	QueueUITask(
-		[](void *param) {
-			std::unique_ptr<FnType> fn(
-				static_cast<FnType *>(param));
-			(*fn)();
-		},
-		heapFunc);
-}
-
 bool MacroActionSource::PerformAction()
 {
 	OBSSource s = obs_weak_source_get_source(_source.GetSource());
@@ -271,17 +257,17 @@ bool MacroActionSource::PerformAction()
 			break;
 		}
 
-		QueueUITaskLambda([&]() {
+		QueueUITask([&]() {
 			closeSourceDialog(s, true, "OBSBasicInteraction");
 		});
 		break;
 	case Action::CLOSE_FILTER_DIALOG:
-		QueueUITaskLambda([&]() {
+		QueueUITask([&]() {
 			closeSourceDialog(s, _acceptDialog, "OBSBasicFilters");
 		});
 		break;
 	case Action::CLOSE_PROPERTIES_DIALOG:
-		QueueUITaskLambda([&]() {
+		QueueUITask([&]() {
 			closeSourceDialog(s, _acceptDialog,
 					  "OBSBasicProperties");
 		});

plugins/base/utils/process-config.cpp

@@ -5,8 +5,74 @@
 
 #include <QFileDialog>
 
+#ifdef __APPLE__
+#include <spawn.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <csignal>
+#include <cerrno>
+#include <chrono>
+#include <thread>
+#include <vector>
+
+extern char **environ;
+#endif
+
 namespace advss {
 
+#ifdef __APPLE__
+// QProcess uses fork(), which is unsafe to call in OBS's multi-threaded,
+// CEF/XPC-using process (see fork(2)). posix_spawn() avoids fork() entirely.
+
+namespace {
+
+std::vector<char *> BuildArgv(const std::string &path, const QStringList &args,
+			      std::vector<std::string> &storage)
+{
+	storage.push_back(path);
+	for (auto &arg : args) {
+		storage.push_back(arg.toStdString());
+	}
+
+	std::vector<char *> argv;
+	argv.reserve(storage.size() + 1);
+	for (auto &arg : storage) {
+		argv.push_back(const_cast<char *>(arg.c_str()));
+	}
+	argv.push_back(nullptr);
+	return argv;
+}
+
+bool DrainPipe(int fd, std::string &buffer)
+{
+	char chunk[4096];
+	while (true) {
+		ssize_t n = read(fd, chunk, sizeof(chunk));
+		if (n > 0) {
+			buffer.append(chunk, static_cast<size_t>(n));
+			continue;
+		}
+		if (n == 0) {
+			return false; // EOF
+		}
+		if (errno == EINTR) {
+			continue;
+		}
+		return true; // EAGAIN/EWOULDBLOCK
+	}
+}
+
+std::string TrimTrailingNewline(const std::string &s)
+{
+	static const QRegularExpression regex("(\\r\\n|\\r|\\n)$");
+	return QString::fromStdString(s).remove(regex).toStdString();
+}
+
+} // namespace
+#endif
+
 bool ProcessConfig::Save(obs_data_t *obj) const
 {
 	auto data = obs_data_create();
@@ -50,11 +116,44 @@ QStringList ProcessConfig::Args() const
 	return result;
 }
 
+#ifdef __APPLE__
+bool ProcessConfig::StartProcessDetached() const
+{
+	auto path = Path();
+	auto workDir = WorkingDir();
+	std::vector<std::string> argStorage;
+	auto argv = BuildArgv(path, Args(), argStorage);
+
+	posix_spawn_file_actions_t actions;
+	posix_spawn_file_actions_init(&actions);
+	if (!workDir.empty()) {
+		posix_spawn_file_actions_addchdir_np(&actions, workDir.c_str());
+	}
+
+	pid_t pid = 0;
+	int rc = posix_spawn(&pid, path.c_str(), &actions, nullptr, argv.data(),
+			     environ);
+	posix_spawn_file_actions_destroy(&actions);
+
+	if (rc != 0) {
+		return false;
+	}
+
+	std::thread([pid]() {
+		int status = 0;
+		while (waitpid(pid, &status, 0) == -1 && errno == EINTR) {
+		}
+	}).detach();
+
+	return true;
+}
+#else
 bool ProcessConfig::StartProcessDetached() const
 {
 	return QProcess::startDetached(QString::fromStdString(Path()), Args(),
 				       QString::fromStdString(WorkingDir()));
 }
+#endif
 
 void ProcessConfig::ResolveVariables()
 {
@@ -63,6 +162,139 @@ void ProcessConfig::ResolveVariables()
 	_args.ResolveVariables();
 }
 
+#ifdef __APPLE__
+std::variant<int, ProcessConfig::ProcStartError>
+ProcessConfig::StartProcessAndWait(int timeout)
+{
+	ResetFinishedProcessData();
+
+	vblog(LOG_INFO, "run \"%s\" with a timeout of %d ms", Path().c_str(),
+	      timeout);
+
+	int outPipe[2];
+	int errPipe[2];
+	if (pipe(outPipe) != 0 || pipe(errPipe) != 0) {
+		vblog(LOG_INFO, "failed to start \"%s\"!", Path().c_str());
+		return ProcStartError::FAILED_TO_START;
+	}
+
+	auto path = Path();
+	auto workDir = WorkingDir();
+	std::vector<std::string> argStorage;
+	auto argv = BuildArgv(path, Args(), argStorage);
+
+	posix_spawn_file_actions_t actions;
+	posix_spawn_file_actions_init(&actions);
+	posix_spawn_file_actions_addclose(&actions, outPipe[0]);
+	posix_spawn_file_actions_addclose(&actions, errPipe[0]);
+	posix_spawn_file_actions_adddup2(&actions, outPipe[1], STDOUT_FILENO);
+	posix_spawn_file_actions_adddup2(&actions, errPipe[1], STDERR_FILENO);
+	posix_spawn_file_actions_addclose(&actions, outPipe[1]);
+	posix_spawn_file_actions_addclose(&actions, errPipe[1]);
+	if (!workDir.empty()) {
+		posix_spawn_file_actions_addchdir_np(&actions, workDir.c_str());
+	}
+
+	pid_t pid = 0;
+	int rc = posix_spawn(&pid, path.c_str(), &actions, nullptr, argv.data(),
+			     environ);
+	posix_spawn_file_actions_destroy(&actions);
+	close(outPipe[1]);
+	close(errPipe[1]);
+
+	if (rc != 0) {
+		close(outPipe[0]);
+		close(errPipe[0]);
+		vblog(LOG_INFO, "failed to start \"%s\"!", Path().c_str());
+		return ProcStartError::FAILED_TO_START;
+	}
+
+	SetProcessId(std::to_string(pid));
+	fcntl(outPipe[0], F_SETFL, O_NONBLOCK);
+	fcntl(errPipe[0], F_SETFL, O_NONBLOCK);
+
+	std::string outBuf;
+	std::string errBuf;
+	bool outDone = false;
+	bool errDone = false;
+	auto deadline = std::chrono::steady_clock::now() +
+			std::chrono::milliseconds(timeout);
+
+	while (!outDone || !errDone) {
+		auto remaining =
+			std::chrono::duration_cast<std::chrono::milliseconds>(
+				deadline - std::chrono::steady_clock::now())
+				.count();
+		if (remaining <= 0) {
+			break;
+		}
+
+		struct pollfd fds[2];
+		int n = 0;
+		int outIdx = -1;
+		int errIdx = -1;
+		if (!outDone) {
+			fds[n] = {outPipe[0], POLLIN, 0};
+			outIdx = n++;
+		}
+		if (!errDone) {
+			fds[n] = {errPipe[0], POLLIN, 0};
+			errIdx = n++;
+		}
+
+		int pr = poll(fds, n, static_cast<int>(remaining));
+		if (pr < 0) {
+			if (errno == EINTR) {
+				continue;
+			}
+			break;
+		}
+
+		if (outIdx >= 0 && fds[outIdx].revents != 0) {
+			if (!DrainPipe(outPipe[0], outBuf)) {
+				outDone = true;
+			}
+		}
+		if (errIdx >= 0 && fds[errIdx].revents != 0) {
+			if (!DrainPipe(errPipe[0], errBuf)) {
+				errDone = true;
+			}
+		}
+	}
+
+	close(outPipe[0]);
+	close(errPipe[0]);
+
+	if (!outDone || !errDone) {
+		vblog(LOG_INFO,
+		      "timeout while running \"%s\"\nAttempting to kill process!",
+		      Path().c_str());
+		kill(pid, SIGKILL);
+		int status = 0;
+		while (waitpid(pid, &status, 0) == -1 && errno == EINTR) {
+		}
+		_processOutputStream = TrimTrailingNewline(outBuf);
+		_processErrorStream = TrimTrailingNewline(errBuf);
+		return ProcStartError::TIMEOUT;
+	}
+
+	int status = 0;
+	while (waitpid(pid, &status, 0) == -1 && errno == EINTR) {
+	}
+
+	_processOutputStream = TrimTrailingNewline(outBuf);
+	_processErrorStream = TrimTrailingNewline(errBuf);
+
+	if (WIFEXITED(status)) {
+		int exitCode = WEXITSTATUS(status);
+		_processExitCode = std::to_string(exitCode);
+		return exitCode;
+	}
+
+	vblog(LOG_INFO, "process \"%s\" crashed!", Path().c_str());
+	return ProcStartError::CRASH;
+}
+#else
 std::variant<int, ProcessConfig::ProcStartError>
 ProcessConfig::StartProcessAndWait(int timeout)
 {
@@ -101,6 +333,7 @@ ProcessConfig::StartProcessAndWait(int timeout)
 	vblog(LOG_INFO, "process \"%s\" crashed!", Path().c_str());
 	return ProcStartError::CRASH;
 }
+#endif
 
 void ProcessConfig::SetFinishedProcessData(QProcess &process)
 {

plugins/twitch/twitch-tab.cpp

@@ -31,14 +31,9 @@ static bool setup()
 	static const auto showInvalidWarnings = [](void *) {
 		const auto invalidTokens = getInvalidTokens();
 		for (const auto &token : invalidTokens) {
-			QueueUITask(
-				[](void *tokenPtr) {
-					auto tokenName = static_cast<QString *>(
-						tokenPtr);
-					InvalidTokenDialog::ShowWarning(
-						*tokenName);
-				},
-				(void *)&token);
+			QueueUITask([token]() {
+				InvalidTokenDialog::ShowWarning(token);
+			});
 		}
 	};
 

tests/stubs/ui-helpers.cpp

@@ -40,7 +40,7 @@ std::string GetThemeTypeName()
 	return "Dark";
 }
 
-void QueueUITask(void (*task)(void *param), void *) {}
+void QueueUITaskRaw(void (*task)(void *param), void *, bool) {}
 
 QWidget *GetSettingsWindow()
 {