Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 657 insertions, 0 deletions

diff --git a/toolkit/xre/nsNativeAppSupportUnix.cpp b/toolkit/xre/nsNativeAppSupportUnix.cpp
new file mode 100644
index 0000000000..1f6d9049ed
--- /dev/null
+++ b/toolkit/xre/nsNativeAppSupportUnix.cpp
@@ -0,0 +1,657 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsNativeAppSupportBase.h"
+#include "nsCOMPtr.h"
+#include "nsXPCOM.h"
+#include "nsISupportsPrimitives.h"
+#include "nsIObserverService.h"
+#include "nsIAppStartup.h"
+#include "nsServiceManagerUtils.h"
+#include "prlink.h"
+#include "nsXREDirProvider.h"
+#include "nsReadableUtils.h"
+
+#include "nsIFile.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsPIDOMWindow.h"
+#include "nsIWidget.h"
+#include "mozilla/Services.h"
+
+#include <stdlib.h>
+#include <glib.h>
+#include <glib-object.h>
+#include <gtk/gtk.h>
+
+#ifdef MOZ_X11
+#  include <gdk/gdkx.h>
+#  include <X11/ICE/ICElib.h>
+#  include <X11/SM/SMlib.h>
+#  include <fcntl.h>
+#  include "nsThreadUtils.h"
+
+#  include <pwd.h>
+#endif
+
+#ifdef MOZ_ENABLE_DBUS
+#  include <dbus/dbus.h>
+#endif
+
+#define MIN_GTK_MAJOR_VERSION 2
+#define MIN_GTK_MINOR_VERSION 10
+#define UNSUPPORTED_GTK_MSG \
+  "We're sorry, this application requires a version of the GTK+ library that is not installed on your computer.\n\n\
+You have GTK+ %d.%d.\nThis application requires GTK+ %d.%d or newer.\n\n\
+Please upgrade your GTK+ library if you wish to use this application."
+
+#if MOZ_X11
+#  undef IceSetIOErrorHandler
+#  undef IceAddConnectionWatch
+#  undef IceConnectionNumber
+#  undef IceProcessMessages
+#  undef IceGetConnectionContext
+#  undef SmcInteractDone
+#  undef SmcSaveYourselfDone
+#  undef SmcInteractRequest
+#  undef SmcCloseConnection
+#  undef SmcOpenConnection
+#  undef SmcSetProperties
+
+typedef IceIOErrorHandler (*IceSetIOErrorHandlerFn)(IceIOErrorHandler);
+typedef int (*IceAddConnectionWatchFn)(IceWatchProc, IcePointer);
+typedef int (*IceConnectionNumberFn)(IceConn);
+typedef IceProcessMessagesStatus (*IceProcessMessagesFn)(IceConn,
+                                                         IceReplyWaitInfo*,
+                                                         Bool*);
+typedef IcePointer (*IceGetConnectionContextFn)(IceConn);
+
+typedef void (*SmcInteractDoneFn)(SmcConn, Bool);
+typedef void (*SmcSaveYourselfDoneFn)(SmcConn, Bool);
+typedef int (*SmcInteractRequestFn)(SmcConn, int, SmcInteractProc, SmPointer);
+typedef SmcCloseStatus (*SmcCloseConnectionFn)(SmcConn, int, char**);
+typedef SmcConn (*SmcOpenConnectionFn)(char*, SmPointer, int, int,
+                                       unsigned long, SmcCallbacks*,
+                                       const char*, char**, int, char*);
+typedef void (*SmcSetPropertiesFn)(SmcConn, int, SmProp**);
+
+static IceSetIOErrorHandlerFn IceSetIOErrorHandlerPtr;
+static IceAddConnectionWatchFn IceAddConnectionWatchPtr;
+static IceConnectionNumberFn IceConnectionNumberPtr;
+static IceProcessMessagesFn IceProcessMessagesPtr;
+static IceGetConnectionContextFn IceGetConnectionContextPtr;
+static SmcInteractDoneFn SmcInteractDonePtr;
+static SmcSaveYourselfDoneFn SmcSaveYourselfDonePtr;
+static SmcInteractRequestFn SmcInteractRequestPtr;
+static SmcCloseConnectionFn SmcCloseConnectionPtr;
+static SmcOpenConnectionFn SmcOpenConnectionPtr;
+static SmcSetPropertiesFn SmcSetPropertiesPtr;
+
+#  define IceSetIOErrorHandler IceSetIOErrorHandlerPtr
+#  define IceAddConnectionWatch IceAddConnectionWatchPtr
+#  define IceConnectionNumber IceConnectionNumberPtr
+#  define IceProcessMessages IceProcessMessagesPtr
+#  define IceGetConnectionContext IceGetConnectionContextPtr
+#  define SmcInteractDone SmcInteractDonePtr
+#  define SmcSaveYourselfDone SmcSaveYourselfDonePtr
+#  define SmcInteractRequest SmcInteractRequestPtr
+#  define SmcCloseConnection SmcCloseConnectionPtr
+#  define SmcOpenConnection SmcOpenConnectionPtr
+#  define SmcSetProperties SmcSetPropertiesPtr
+
+enum ClientState {
+  STATE_DISCONNECTED,
+  STATE_REGISTERING,
+  STATE_IDLE,
+  STATE_INTERACTING,
+  STATE_SHUTDOWN_CANCELLED
+};
+
+static const char* gClientStateTable[] = {"DISCONNECTED", "REGISTERING", "IDLE",
+                                          "INTERACTING", "SHUTDOWN_CANCELLED"};
+
+static LazyLogModule sMozSMLog("MozSM");
+#endif /* MOZ_X11 */
+
+class nsNativeAppSupportUnix : public nsNativeAppSupportBase {
+ public:
+#if MOZ_X11
+  nsNativeAppSupportUnix()
+      : mSessionConnection(nullptr), mClientState(STATE_DISCONNECTED){};
+  ~nsNativeAppSupportUnix() {
+    // this goes out of scope after "web-workers-shutdown" async shutdown phase
+    // so it's safe to disconnect here (i.e. the application won't lose data)
+    DisconnectFromSM();
+  };
+
+  void DisconnectFromSM();
+#endif
+  NS_IMETHOD Start(bool* aRetVal) override;
+  NS_IMETHOD Enable() override;
+
+ private:
+#if MOZ_X11
+  static void SaveYourselfCB(SmcConn smc_conn, SmPointer client_data,
+                             int save_style, Bool shutdown, int interact_style,
+                             Bool fast);
+  static void DieCB(SmcConn smc_conn, SmPointer client_data);
+  static void InteractCB(SmcConn smc_conn, SmPointer client_data);
+  static void SaveCompleteCB(SmcConn smc_conn, SmPointer client_data){};
+  static void ShutdownCancelledCB(SmcConn smc_conn, SmPointer client_data);
+  void DoInteract();
+  void SetClientState(ClientState aState) {
+    mClientState = aState;
+    MOZ_LOG(sMozSMLog, LogLevel::Debug,
+            ("New state = %s\n", gClientStateTable[aState]));
+  }
+
+  SmcConn mSessionConnection;
+  ClientState mClientState;
+#endif
+};
+
+#if MOZ_X11
+static gboolean process_ice_messages(IceConn connection) {
+  IceProcessMessagesStatus status;
+
+  status = IceProcessMessages(connection, nullptr, nullptr);
+
+  switch (status) {
+    case IceProcessMessagesSuccess:
+      return TRUE;
+
+    case IceProcessMessagesIOError: {
+      nsNativeAppSupportUnix* native = static_cast<nsNativeAppSupportUnix*>(
+          IceGetConnectionContext(connection));
+      native->DisconnectFromSM();
+    }
+      return FALSE;
+
+    case IceProcessMessagesConnectionClosed:
+      return FALSE;
+
+    default:
+      g_assert_not_reached();
+  }
+}
+
+static gboolean ice_iochannel_watch(GIOChannel* channel, GIOCondition condition,
+                                    gpointer client_data) {
+  return process_ice_messages(static_cast<IceConn>(client_data));
+}
+
+static void ice_connection_watch(IceConn connection, IcePointer client_data,
+                                 Bool opening, IcePointer* watch_data) {
+  guint watch_id;
+
+  if (opening) {
+    GIOChannel* channel;
+    int fd = IceConnectionNumber(connection);
+
+    fcntl(fd, F_SETFD, fcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
+    channel = g_io_channel_unix_new(fd);
+    watch_id =
+        g_io_add_watch(channel, static_cast<GIOCondition>(G_IO_IN | G_IO_ERR),
+                       ice_iochannel_watch, connection);
+    g_io_channel_unref(channel);
+
+    *watch_data = GUINT_TO_POINTER(watch_id);
+  } else {
+    watch_id = GPOINTER_TO_UINT(*watch_data);
+    g_source_remove(watch_id);
+  }
+}
+
+static void ice_io_error_handler(IceConn connection) {
+  // override the default handler which would exit the application;
+  // do nothing and let ICELib handle the failure of the connection gracefully.
+}
+
+static void ice_init(void) {
+  static bool initted = false;
+
+  if (!initted) {
+    IceSetIOErrorHandler(ice_io_error_handler);
+    IceAddConnectionWatch(ice_connection_watch, nullptr);
+    initted = true;
+  }
+}
+
+void nsNativeAppSupportUnix::InteractCB(SmcConn smc_conn,
+                                        SmPointer client_data) {
+  nsNativeAppSupportUnix* self =
+      static_cast<nsNativeAppSupportUnix*>(client_data);
+
+  self->SetClientState(STATE_INTERACTING);
+
+  // We do this asynchronously, as we spin the event loop recursively if
+  // a dialog is displayed. If we do this synchronously, we don't finish
+  // processing the current ICE event whilst the dialog is displayed, which
+  // means we won't process any more. libsm hates us if we do the InteractDone
+  // with a pending ShutdownCancelled, and we would certainly like to handle Die
+  // whilst a dialog is displayed
+  NS_DispatchToCurrentThread(
+      NewRunnableMethod("nsNativeAppSupportUnix::DoInteract", self,
+                        &nsNativeAppSupportUnix::DoInteract));
+}
+
+void nsNativeAppSupportUnix::DoInteract() {
+  nsCOMPtr<nsIObserverService> obsServ =
+      mozilla::services::GetObserverService();
+  if (!obsServ) {
+    SmcInteractDone(mSessionConnection, False);
+    SmcSaveYourselfDone(mSessionConnection, True);
+    SetClientState(STATE_IDLE);
+    return;
+  }
+
+  nsCOMPtr<nsISupportsPRBool> cancelQuit =
+      do_CreateInstance(NS_SUPPORTS_PRBOOL_CONTRACTID);
+
+  bool abortQuit = false;
+  if (cancelQuit) {
+    cancelQuit->SetData(false);
+    obsServ->NotifyObservers(cancelQuit, "quit-application-requested", nullptr);
+
+    cancelQuit->GetData(&abortQuit);
+  }
+
+  if (!abortQuit && mClientState == STATE_DISCONNECTED) {
+    // The session manager disappeared, whilst we were interacting, so
+    // quit now
+    nsCOMPtr<nsIAppStartup> appService =
+        do_GetService("@mozilla.org/toolkit/app-startup;1");
+
+    if (appService) {
+      bool userAllowedQuit = true;
+      appService->Quit(nsIAppStartup::eForceQuit, 0, &userAllowedQuit);
+    }
+  } else {
+    if (mClientState != STATE_SHUTDOWN_CANCELLED) {
+      // Only do this if the shutdown wasn't cancelled
+      SmcInteractDone(mSessionConnection, !!abortQuit);
+      SmcSaveYourselfDone(mSessionConnection, !abortQuit);
+    }
+
+    SetClientState(STATE_IDLE);
+  }
+}
+
+void nsNativeAppSupportUnix::SaveYourselfCB(SmcConn smc_conn,
+                                            SmPointer client_data,
+                                            int save_style, Bool shutdown,
+                                            int interact_style, Bool fast) {
+  nsNativeAppSupportUnix* self =
+      static_cast<nsNativeAppSupportUnix*>(client_data);
+
+  // Expect a SaveYourselfCB if we're registering a new client.
+  // All properties are already set in Start() so just reply with
+  // SmcSaveYourselfDone if the callback matches the expected signature.
+  //
+  // Ancient versions (?) of xsm do not follow such an early SaveYourself with
+  // SaveComplete. This is a problem if the application freezes interaction
+  // while waiting for a response to SmcSaveYourselfDone. So never freeze
+  // interaction when in STATE_REGISTERING.
+  //
+  // That aside, we could treat each combination of flags appropriately and not
+  // special-case this.
+  if (self->mClientState == STATE_REGISTERING) {
+    self->SetClientState(STATE_IDLE);
+
+    if (save_style == SmSaveLocal && interact_style == SmInteractStyleNone &&
+        !shutdown && !fast) {
+      SmcSaveYourselfDone(self->mSessionConnection, True);
+      return;
+    }
+  }
+
+  if (self->mClientState == STATE_SHUTDOWN_CANCELLED) {
+    // The last shutdown request was cancelled whilst we were interacting,
+    // and we haven't finished interacting yet. Switch the state back again
+    self->SetClientState(STATE_INTERACTING);
+  }
+
+  nsCOMPtr<nsIObserverService> obsServ =
+      mozilla::services::GetObserverService();
+  if (!obsServ) {
+    SmcSaveYourselfDone(smc_conn, True);
+    return;
+  }
+
+  bool status = false;
+  nsCOMPtr<nsISupportsPRBool> didSaveSession =
+      do_CreateInstance(NS_SUPPORTS_PRBOOL_CONTRACTID);
+
+  if (!didSaveSession) {
+    SmcSaveYourselfDone(smc_conn, True);
+    return;
+  }
+
+  // Notify observers to save the session state
+  didSaveSession->SetData(false);
+  obsServ->NotifyObservers(didSaveSession, "session-save", nullptr);
+
+  didSaveSession->GetData(&status);
+
+  // If the interact style permits us to, we are shutting down and we didn't
+  // manage to (or weren't asked to) save the local state, then notify the user
+  // in advance that we are doing to quit (assuming that we aren't already
+  // doing so)
+  if (!status && shutdown && interact_style != SmInteractStyleNone) {
+    if (self->mClientState != STATE_INTERACTING) {
+      SmcInteractRequest(smc_conn, SmDialogNormal,
+                         nsNativeAppSupportUnix::InteractCB, client_data);
+    }
+  } else {
+    SmcSaveYourselfDone(smc_conn, True);
+  }
+}
+
+void nsNativeAppSupportUnix::DieCB(SmcConn smc_conn, SmPointer client_data) {
+  nsCOMPtr<nsIAppStartup> appService =
+      do_GetService("@mozilla.org/toolkit/app-startup;1");
+
+  if (appService) {
+    bool userAllowedQuit = false;
+    appService->Quit(nsIAppStartup::eForceQuit, 0, &userAllowedQuit);
+  }
+  // Quit causes the shutdown to begin but the shutdown process is asynchronous
+  // so we can't DisconnectFromSM() yet
+}
+
+void nsNativeAppSupportUnix::ShutdownCancelledCB(SmcConn smc_conn,
+                                                 SmPointer client_data) {
+  nsNativeAppSupportUnix* self =
+      static_cast<nsNativeAppSupportUnix*>(client_data);
+
+  // Interacting is the only time when we wouldn't already have called
+  // SmcSaveYourselfDone. Do that now, then set the state to make sure we
+  // don't send it again after finishing interacting
+  if (self->mClientState == STATE_INTERACTING) {
+    SmcSaveYourselfDone(smc_conn, False);
+    self->SetClientState(STATE_SHUTDOWN_CANCELLED);
+  }
+}
+
+void nsNativeAppSupportUnix::DisconnectFromSM() {
+  // the SM is free to exit any time after we disconnect, so callers must be
+  // sure to have reached a sufficiently advanced phase of shutdown that there
+  // is no risk of data loss:
+  // e.g. all async writes are complete by the end of "profile-before-change"
+  if (mSessionConnection) {
+    SetClientState(STATE_DISCONNECTED);
+    SmcCloseConnection(mSessionConnection, 0, nullptr);
+    mSessionConnection = nullptr;
+    gdk_x11_set_sm_client_id(nullptr);  // follow gnome-client behaviour
+  }
+}
+
+static void SetSMValue(SmPropValue& val, const nsCString& data) {
+  val.value = static_cast<SmPointer>(const_cast<char*>(data.get()));
+  val.length = data.Length();
+}
+
+static void SetSMProperty(SmProp& prop, const char* name, const char* type,
+                          int numVals, SmPropValue vals[]) {
+  prop.name = const_cast<char*>(name);
+  prop.type = const_cast<char*>(type);
+  prop.num_vals = numVals;
+  prop.vals = vals;
+}
+#endif /* MOZ_X11 */
+
+static void RemoveArg(char** argv) {
+  do {
+    *argv = *(argv + 1);
+    ++argv;
+  } while (*argv);
+
+  --gArgc;
+}
+
+NS_IMETHODIMP
+nsNativeAppSupportUnix::Start(bool* aRetVal) {
+  NS_ASSERTION(gAppData, "gAppData must not be null.");
+
+// The dbus library is used by both nsWifiScannerDBus and BluetoothDBusService,
+// from diffrent threads. This could lead to race conditions if the dbus is not
+// initialized before making any other library calls.
+#ifdef MOZ_ENABLE_DBUS
+  dbus_threads_init_default();
+#endif
+
+  *aRetVal = true;
+
+#ifdef MOZ_X11
+  gboolean sm_disable = FALSE;
+  if (!getenv("SESSION_MANAGER")) {
+    sm_disable = TRUE;
+  }
+
+  nsAutoCString prev_client_id;
+
+  char** curarg = gArgv + 1;
+  while (*curarg) {
+    char* arg = *curarg;
+    if (arg[0] == '-' && arg[1] == '-') {
+      arg += 2;
+      if (!strcmp(arg, "sm-disable")) {
+        RemoveArg(curarg);
+        sm_disable = TRUE;
+        continue;
+      } else if (!strcmp(arg, "sm-client-id")) {
+        RemoveArg(curarg);
+        if (*curarg[0] != '-') {
+          prev_client_id = *curarg;
+          RemoveArg(curarg);
+        }
+        continue;
+      }
+    }
+
+    ++curarg;
+  }
+
+  if (prev_client_id.IsEmpty()) {
+    prev_client_id = getenv("DESKTOP_AUTOSTART_ID");
+  }
+
+  // We don't want child processes to use the same ID
+  unsetenv("DESKTOP_AUTOSTART_ID");
+
+  char* client_id = nullptr;
+  if (!sm_disable) {
+    PRLibrary* iceLib = PR_LoadLibrary("libICE.so.6");
+    if (!iceLib) {
+      return NS_OK;
+    }
+
+    PRLibrary* smLib = PR_LoadLibrary("libSM.so.6");
+    if (!smLib) {
+      PR_UnloadLibrary(iceLib);
+      return NS_OK;
+    }
+
+    IceSetIOErrorHandler = (IceSetIOErrorHandlerFn)PR_FindFunctionSymbol(
+        iceLib, "IceSetIOErrorHandler");
+    IceAddConnectionWatch = (IceAddConnectionWatchFn)PR_FindFunctionSymbol(
+        iceLib, "IceAddConnectionWatch");
+    IceConnectionNumber = (IceConnectionNumberFn)PR_FindFunctionSymbol(
+        iceLib, "IceConnectionNumber");
+    IceProcessMessages = (IceProcessMessagesFn)PR_FindFunctionSymbol(
+        iceLib, "IceProcessMessages");
+    IceGetConnectionContext = (IceGetConnectionContextFn)PR_FindFunctionSymbol(
+        iceLib, "IceGetConnectionContext");
+    if (!IceSetIOErrorHandler || !IceAddConnectionWatch ||
+        !IceConnectionNumber || !IceProcessMessages ||
+        !IceGetConnectionContext) {
+      PR_UnloadLibrary(iceLib);
+      PR_UnloadLibrary(smLib);
+      return NS_OK;
+    }
+
+    SmcInteractDone =
+        (SmcInteractDoneFn)PR_FindFunctionSymbol(smLib, "SmcInteractDone");
+    SmcSaveYourselfDone = (SmcSaveYourselfDoneFn)PR_FindFunctionSymbol(
+        smLib, "SmcSaveYourselfDone");
+    SmcInteractRequest = (SmcInteractRequestFn)PR_FindFunctionSymbol(
+        smLib, "SmcInteractRequest");
+    SmcCloseConnection = (SmcCloseConnectionFn)PR_FindFunctionSymbol(
+        smLib, "SmcCloseConnection");
+    SmcOpenConnection =
+        (SmcOpenConnectionFn)PR_FindFunctionSymbol(smLib, "SmcOpenConnection");
+    SmcSetProperties =
+        (SmcSetPropertiesFn)PR_FindFunctionSymbol(smLib, "SmcSetProperties");
+    if (!SmcInteractDone || !SmcSaveYourselfDone || !SmcInteractRequest ||
+        !SmcCloseConnection || !SmcOpenConnection || !SmcSetProperties) {
+      PR_UnloadLibrary(iceLib);
+      PR_UnloadLibrary(smLib);
+      return NS_OK;
+    }
+
+    ice_init();
+
+    // all callbacks are mandatory in libSM 1.0, so listen even if we don't
+    // care.
+    unsigned long mask = SmcSaveYourselfProcMask | SmcDieProcMask |
+                         SmcSaveCompleteProcMask | SmcShutdownCancelledProcMask;
+
+    SmcCallbacks callbacks;
+    callbacks.save_yourself.callback = nsNativeAppSupportUnix::SaveYourselfCB;
+    callbacks.save_yourself.client_data = static_cast<SmPointer>(this);
+
+    callbacks.die.callback = nsNativeAppSupportUnix::DieCB;
+    callbacks.die.client_data = static_cast<SmPointer>(this);
+
+    callbacks.save_complete.callback = nsNativeAppSupportUnix::SaveCompleteCB;
+    callbacks.save_complete.client_data = nullptr;
+
+    callbacks.shutdown_cancelled.callback =
+        nsNativeAppSupportUnix::ShutdownCancelledCB;
+    callbacks.shutdown_cancelled.client_data = static_cast<SmPointer>(this);
+
+    char errbuf[256];
+    mSessionConnection = SmcOpenConnection(
+        nullptr, this, SmProtoMajor, SmProtoMinor, mask, &callbacks,
+        prev_client_id.get(), &client_id, sizeof(errbuf), errbuf);
+  }
+
+  if (!mSessionConnection) {
+    return NS_OK;
+  }
+
+  LogModule::Init(
+      gArgc, gArgv);  // need to make sure initialized before SetClientState
+  if (prev_client_id.IsEmpty() ||
+      (client_id && !prev_client_id.Equals(client_id))) {
+    SetClientState(STATE_REGISTERING);
+  } else {
+    SetClientState(STATE_IDLE);
+  }
+
+  gdk_x11_set_sm_client_id(client_id);
+
+  // Set SM Properties
+  // SmCloneCommand, SmProgram, SmRestartCommand, SmUserID are required
+  // properties so must be set, and must have a sensible fallback value.
+
+  // Determine executable path to use for XSMP session restore
+
+  // Is there a request to suppress default binary launcher?
+  nsAutoCString path(getenv("MOZ_APP_LAUNCHER"));
+
+  if (path.IsEmpty()) {
+    NS_ASSERTION(gDirServiceProvider,
+                 "gDirServiceProvider is NULL! This shouldn't happen!");
+    nsCOMPtr<nsIFile> executablePath;
+    nsresult rv;
+
+    bool dummy;
+    rv = gDirServiceProvider->GetFile(XRE_EXECUTABLE_FILE, &dummy,
+                                      getter_AddRefs(executablePath));
+
+    if (NS_SUCCEEDED(rv)) {
+      // Strip off the -bin suffix to get the shell script we should run; this
+      // is what Breakpad does
+      nsAutoCString leafName;
+      rv = executablePath->GetNativeLeafName(leafName);
+      if (NS_SUCCEEDED(rv) && StringEndsWith(leafName, "-bin"_ns)) {
+        leafName.SetLength(leafName.Length() - strlen("-bin"));
+        executablePath->SetNativeLeafName(leafName);
+      }
+
+      executablePath->GetNativePath(path);
+    }
+  }
+
+  if (path.IsEmpty()) {
+    // can't determine executable path. Best fallback is name from
+    // application.ini but it might not resolve to the same executable at
+    // launch time.
+    path = gAppData->name;  // will always be set
+    ToLowerCase(path);
+    MOZ_LOG(sMozSMLog, LogLevel::Warning,
+            ("Could not determine executable path. Falling back to %s.",
+             path.get()));
+  }
+
+  SmProp propRestart, propClone, propProgram, propUser, *props[4];
+  SmPropValue valsRestart[3], valsClone[1], valsProgram[1], valsUser[1];
+  int n = 0;
+
+  constexpr auto kClientIDParam = "--sm-client-id"_ns;
+
+  SetSMValue(valsRestart[0], path);
+  SetSMValue(valsRestart[1], kClientIDParam);
+  SetSMValue(valsRestart[2], nsDependentCString(client_id));
+  SetSMProperty(propRestart, SmRestartCommand, SmLISTofARRAY8, 3, valsRestart);
+  props[n++] = &propRestart;
+
+  SetSMValue(valsClone[0], path);
+  SetSMProperty(propClone, SmCloneCommand, SmLISTofARRAY8, 1, valsClone);
+  props[n++] = &propClone;
+
+  nsAutoCString appName(gAppData->name);  // will always be set
+  ToLowerCase(appName);
+
+  SetSMValue(valsProgram[0], appName);
+  SetSMProperty(propProgram, SmProgram, SmARRAY8, 1, valsProgram);
+  props[n++] = &propProgram;
+
+  nsAutoCString userName;  // username that started the program
+  struct passwd* pw = getpwuid(getuid());
+  if (pw && pw->pw_name) {
+    userName = pw->pw_name;
+  } else {
+    userName = "nobody"_ns;
+    MOZ_LOG(
+        sMozSMLog, LogLevel::Warning,
+        ("Could not determine user-name. Falling back to %s.", userName.get()));
+  }
+
+  SetSMValue(valsUser[0], userName);
+  SetSMProperty(propUser, SmUserID, SmARRAY8, 1, valsUser);
+  props[n++] = &propUser;
+
+  SmcSetProperties(mSessionConnection, n, props);
+
+  g_free(client_id);
+#endif /* MOZ_X11 */
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNativeAppSupportUnix::Enable() { return NS_OK; }
+
+nsresult NS_CreateNativeAppSupport(nsINativeAppSupport** aResult) {
+  nsNativeAppSupportBase* native = new nsNativeAppSupportUnix();
+  if (!native) return NS_ERROR_OUT_OF_MEMORY;
+
+  *aResult = native;
+  NS_ADDREF(*aResult);
+
+  return NS_OK;
+}