Quelle UtilityProcessManager.cpp Sprache: C

/* -*- 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 "UtilityProcessManager.h"

#include "JSOracleParent.h"
#include "mozilla/ipc/UtilityProcessHost.h"
#include "mozilla/MemoryReportingProcess.h"
#include "mozilla/Preferences.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/StaticPrefs_media.h"
#include "mozilla/SyncRunnable.h"  // for LaunchUtilityProcess
#include "mozilla/ipc/UtilityProcessParent.h"
#include "mozilla/ipc/UtilityAudioDecoderChild.h"
#include "mozilla/ipc/UtilityAudioDecoderParent.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/ipc/UtilityProcessSandboxing.h"
#include "mozilla/ipc/ProcessChild.h"
#include "nsAppRunner.h"
#include "nsContentUtils.h"

#ifdef XP_WIN
#  include "mozilla/dom/WindowsUtilsParent.h"
#  include "mozilla/widget/filedialog/WinFileDialogParent.h"
#endif

#include "mozilla/GeckoArgs.h"

namespace mozilla::ipc {

extern LazyLogModule gUtilityProcessLog;
#define LOGD(...) MOZ_LOG(gUtilityProcessLog, LogLevel::Debug, (__VA_ARGS__))

static StaticRefPtr<UtilityProcessManager> sSingleton;

static bool sXPCOMShutdown = false;

bool UtilityProcessManager::IsShutdown() const {
  MOZ_ASSERT(NS_IsMainThread());
  return sXPCOMShutdown || !sSingleton;
}

RefPtr<UtilityProcessManager> UtilityProcessManager::GetSingleton() {
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(NS_IsMainThread());

  if (!sXPCOMShutdown && sSingleton == nullptr) {
    sSingleton = new UtilityProcessManager();
    sSingleton->Init();
  }
  return sSingleton;
}

RefPtr<UtilityProcessManager> UtilityProcessManager::GetIfExists() {
  MOZ_ASSERT(NS_IsMainThread());
  return sSingleton;
}

UtilityProcessManager::UtilityProcessManager() {
  LOGD("[%p] UtilityProcessManager::UtilityProcessManager", this);
}

void UtilityProcessManager::Init() {
  // Start listening for pref changes so we can
  // forward them to the process once it is running.
  mObserver = new Observer(this);
  nsContentUtils::RegisterShutdownObserver(mObserver);
  Preferences::AddStrongObserver(mObserver, "");
}

UtilityProcessManager::~UtilityProcessManager() {
  LOGD("[%p] UtilityProcessManager::~UtilityProcessManager", this);

  // The Utility process should ALL have already been shut down.
  MOZ_ASSERT(NoMoreProcesses());
}

NS_IMPL_ISUPPORTS(UtilityProcessManager::Observer, nsIObserver);

UtilityProcessManager::Observer::Observer(UtilityProcessManager* aManager)
    : mManager(aManager) {}

NS_IMETHODIMP
UtilityProcessManager::Observer::Observe(nsISupports* aSubject,
                                         const char* aTopic,
                                         const char16_t* aData) {
  if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
    mManager->OnXPCOMShutdown();
  } else if (!strcmp(aTopic, "nsPref:changed")) {
    mManager->OnPreferenceChange(aData);
  }
  return NS_OK;
}

void UtilityProcessManager::OnXPCOMShutdown() {
  LOGD("[%p] UtilityProcessManager::OnXPCOMShutdown", this);

  MOZ_ASSERT(NS_IsMainThread());
  sXPCOMShutdown = true;
  nsContentUtils::UnregisterShutdownObserver(mObserver);
  CleanShutdownAllProcesses();
}

void UtilityProcessManager::OnPreferenceChange(const char16_t* aData) {
  MOZ_ASSERT(NS_IsMainThread());
  if (NoMoreProcesses()) {
    // Process hasn't been launched yet
    return;
  }
  // We know prefs are ASCII here.
  NS_LossyConvertUTF16toASCII strData(aData);

  mozilla::dom::Pref pref(strData, /* isLocked */ false,
                          /* isSanitized */ false, Nothing(), Nothing());
  Preferences::GetPreference(&pref, GeckoProcessType_Utility,
                             /* remoteType */ ""_ns);

  for (auto& p : mProcesses) {
    if (!p) {
      continue;
    }

    if (p->mProcessParent) {
      Unused << p->mProcessParent->SendPreferenceUpdate(pref);
    } else if (IsProcessLaunching(p->mSandbox)) {
      p->mQueuedPrefs.AppendElement(pref);
    }
  }
}

RefPtr<UtilityProcessManager::ProcessFields> UtilityProcessManager::GetProcess(
    SandboxingKind aSandbox) {
  if (!mProcesses[aSandbox]) {
    return nullptr;
  }

  return mProcesses[aSandbox];
}

RefPtr<UtilityProcessManager::SharedLaunchPromise<Ok>>
UtilityProcessManager::LaunchProcess(SandboxingKind aSandbox) {
  LOGD("[%p] UtilityProcessManager::LaunchProcess SandboxingKind=%" PRIu64,
       this, aSandbox);
  using RetPromise = SharedLaunchPromise<Ok>;

  MOZ_ASSERT(NS_IsMainThread());

  if (IsShutdown()) {
    NS_WARNING("Reject early LaunchProcess() for Shutdown");
    return RetPromise::CreateAndReject(
        LaunchError("UPM::LaunchProcess(): IsShutdown()"), __func__);
  }

  RefPtr<ProcessFields> p = GetProcess(aSandbox);
  if (p && p->mNumProcessAttempts) {
    // We failed to start the Utility process earlier, abort now.
    NS_WARNING("Reject LaunchProcess() for earlier mNumProcessAttempts");
    return RetPromise::CreateAndReject(
        LaunchError("UPM::LaunchProcess(): p->mNumProcessAttempts"), __func__);
  }

  if (p && p->mLaunchPromise && p->mProcess) {
    return p->mLaunchPromise;
  }

  if (!p) {
    p = new ProcessFields(aSandbox);
    mProcesses[aSandbox] = p;
  }

  geckoargs::ChildProcessArgs extraArgs;
  ProcessChild::AddPlatformBuildID(extraArgs);
  geckoargs::sSandboxingKind.Put(aSandbox, extraArgs);

  // The subprocess is launched asynchronously, so we
  // wait for the promise to be resolved to acquire the IPDL actor.
  p->mProcess = new UtilityProcessHost(aSandbox, this);
  if (!p->mProcess->Launch(std::move(extraArgs))) {
    p->mNumProcessAttempts++;
    DestroyProcess(aSandbox);
    NS_WARNING("Reject LaunchProcess() for mNumProcessAttempts++");
    return RetPromise::CreateAndReject(
        LaunchError("UPM::LaunchProcess(): mNumProcessAttempts++"), __func__);
  }

  RefPtr<UtilityProcessManager> self = this;
  p->mLaunchPromise = p->mProcess->LaunchPromise()->Then(
      GetMainThreadSerialEventTarget(), __func__,
      [self, p, aSandbox](Ok) -> RefPtr<RetPromise> {
        if (self->IsShutdown()) {
          NS_WARNING(
              "Reject LaunchProcess() after LaunchPromise() for Shutdown");
          return RetPromise::CreateAndReject(
              LaunchError("UPM::LaunchProcess(): post-await IsShutdown()"),
              __func__);
        }

        if (self->IsProcessDestroyed(aSandbox)) {
          NS_WARNING(
              "Reject LaunchProcess() after LaunchPromise() for destroyed "
              "process");
          return RetPromise::CreateAndReject(
              LaunchError(
                  "UPM::LaunchProcess(): post-await IsProcessDestroyed()"),
              __func__);
        }

        p->mProcessParent = p->mProcess->GetActor();

        // Flush any pref updates that happened during
        // launch and weren't included in the blobs set
        // up in LaunchUtilityProcess.
        for (const mozilla::dom::Pref& pref : p->mQueuedPrefs) {
          Unused << NS_WARN_IF(!p->mProcessParent->SendPreferenceUpdate(pref));
        }
        p->mQueuedPrefs.Clear();

        CrashReporter::RecordAnnotationCString(
            CrashReporter::Annotation::UtilityProcessStatus, "Running");

        return RetPromise::CreateAndResolve(Ok{}, __func__);
      },
      [self, p, aSandbox](LaunchError error) {
        if (GetSingleton()) {
          p->mNumProcessAttempts++;
          self->DestroyProcess(aSandbox);
        }
        NS_WARNING("Reject LaunchProcess() for LaunchPromise() rejection");
        return RetPromise::CreateAndReject(std::move(error), __func__);
      });

  return p->mLaunchPromise;
}

template <typename Actor>
RefPtr<UtilityProcessManager::LaunchPromise<Ok>>
UtilityProcessManager::StartUtility(RefPtr<Actor> aActor,
                                    SandboxingKind aSandbox) {
  using RetPromise = LaunchPromise<Ok>;

  LOGD(
      "[%p] UtilityProcessManager::StartUtility actor=%p "
      "SandboxingKind=%" PRIu64,
      this, aActor.get(), aSandbox);

  TimeStamp utilityStart = TimeStamp::Now();

  if (!aActor) {
    MOZ_ASSERT(false, "Actor singleton failure");
    return RetPromise::CreateAndReject(
        LaunchError("UPM::StartUtility: aActor is null"), __func__);
  }

  if (aActor->CanSend()) {
    // Actor has already been setup, so we:
    //   - know the process has been launched
    //   - the ipc actors are ready
    PROFILER_MARKER_TEXT(
        "UtilityProcessManager::StartUtility", IPC,
        MarkerOptions(MarkerTiming::InstantNow()),
        nsPrintfCString("SandboxingKind=%" PRIu64 " aActor->CanSend()",
                        aSandbox));
    return RetPromise::CreateAndResolve(Ok{}, __func__);
  }

  RefPtr<UtilityProcessManager> self = this;
  return LaunchProcess(aSandbox)->Then(
      GetMainThreadSerialEventTarget(), __func__,
      [self, aActor, aSandbox, utilityStart]() -> RefPtr<RetPromise> {
        RefPtr<UtilityProcessParent> utilityParent =
            self->GetProcessParent(aSandbox);
        if (!utilityParent) {
          NS_WARNING("Missing parent in StartUtility");
          return RetPromise::CreateAndReject(
              LaunchError("UPM::GetProcessParent"), __func__);
        }

        // It is possible if multiple processes concurrently request a utility
        // actor that the previous CanSend() check returned false for both but
        // that by the time we have started our process for real, one of them
        // has already been able to establish the IPC connection and thus we
        // would perform more than one Open() call.
        //
        // The tests within browser_utility_multipleAudio.js should be able to
        // catch that behavior.
        if (!aActor->CanSend()) {
          nsresult rv = aActor->BindToUtilityProcess(utilityParent);
          if (NS_FAILED(rv)) {
            MOZ_ASSERT(false, "Protocol endpoints failure");
            return RetPromise::CreateAndReject(
                LaunchError("BindToUtilityProcess", rv), __func__);
          }

          MOZ_DIAGNOSTIC_ASSERT(aActor->CanSend(), "IPC established for actor");
          self->RegisterActor(utilityParent, aActor->GetActorName());
        }

        PROFILER_MARKER_TEXT(
            "UtilityProcessManager::StartUtility", IPC,
            MarkerOptions(MarkerTiming::IntervalUntilNowFrom(utilityStart)),
            nsPrintfCString("SandboxingKind=%" PRIu64 " Resolve", aSandbox));
        return RetPromise::CreateAndResolve(Ok{}, __func__);
      },
      [self, aSandbox, utilityStart](LaunchError const& error) {
        NS_WARNING("Reject StartUtility() for LaunchProcess() rejection");
        if (!self->IsShutdown()) {
          NS_WARNING("Reject StartUtility() when !IsShutdown()");
        }
        PROFILER_MARKER_TEXT(
            "UtilityProcessManager::StartUtility", IPC,
            MarkerOptions(MarkerTiming::IntervalUntilNowFrom(utilityStart)),
            nsPrintfCString("SandboxingKind=%" PRIu64 " Reject", aSandbox));
        return RetPromise::CreateAndReject(error, __func__);
      });
}

RefPtr<UtilityProcessManager::StartRemoteDecodingUtilityPromise>
UtilityProcessManager::StartProcessForRemoteMediaDecoding(
    EndpointProcInfo aOtherProcess, dom::ContentParentId aChildId,
    SandboxingKind aSandbox) {
  using RetPromise = StartRemoteDecodingUtilityPromise;

  // Not supported kinds.
  if (aSandbox != SandboxingKind::GENERIC_UTILITY
#ifdef MOZ_APPLEMEDIA
      && aSandbox != SandboxingKind::UTILITY_AUDIO_DECODING_APPLE_MEDIA
#endif
#ifdef XP_WIN
      && aSandbox != SandboxingKind::UTILITY_AUDIO_DECODING_WMF
#endif
#ifdef MOZ_WMF_MEDIA_ENGINE
      && aSandbox != SandboxingKind::MF_MEDIA_ENGINE_CDM
#endif
  ) {
    return RetPromise::CreateAndReject(
        LaunchError("Start...MediaDecoding: bad sandbox type"), __func__);
  }
  TimeStamp remoteDecodingStart = TimeStamp::Now();

  RefPtr<UtilityProcessManager> self = this;
  RefPtr<UtilityAudioDecoderChild> uadc =
      UtilityAudioDecoderChild::GetSingleton(aSandbox);
  MOZ_ASSERT(uadc, "Unable to get a singleton for UtilityAudioDecoderChild");
  return StartUtility(uadc, aSandbox)
      ->Then(
          GetMainThreadSerialEventTarget(), __func__,
          [self, uadc, aOtherProcess, aChildId, aSandbox,
           remoteDecodingStart]() {
            RefPtr<UtilityProcessParent> parent =
                self->GetProcessParent(aSandbox);
            if (!parent) {
              NS_WARNING("UtilityAudioDecoderParent lost in the middle");
              return RetPromise::CreateAndReject(
                  LaunchError("Start...MediaDecoding: parent lost"), __func__);
            }

            if (!uadc->CanSend()) {
              NS_WARNING("UtilityAudioDecoderChild lost in the middle");
              return RetPromise::CreateAndReject(
                  LaunchError("Start...MediaDecoding: child lost"), __func__);
            }

            EndpointProcInfo process = parent->OtherEndpointProcInfo();

            Endpoint<PRemoteDecoderManagerChild> childPipe;
            Endpoint<PRemoteDecoderManagerParent> parentPipe;
            if (nsresult const rv = PRemoteDecoderManager::CreateEndpoints(
                    process, aOtherProcess, &parentPipe, &childPipe);
                NS_FAILED(rv)) {
              MOZ_ASSERT(false, "Could not create content remote decoder");
              return RetPromise::CreateAndReject(
                  LaunchError("PRemoteDecoderManager::CreateEndpoints", rv),
                  __func__);
            }

            if (!uadc->SendNewContentRemoteDecoderManager(std::move(parentPipe),
                                                          aChildId)) {
              MOZ_ASSERT(false, "SendNewContentRemoteDecoderManager failure");
              return RetPromise::CreateAndReject(
                  LaunchError("UADC::SendNewCRDM"), __func__);
            }

#ifdef MOZ_WMF_MEDIA_ENGINE
            if (aSandbox == SandboxingKind::MF_MEDIA_ENGINE_CDM &&
                !uadc->CreateVideoBridge()) {
              MOZ_ASSERT(false, "Failed to create video bridge");
              return RetPromise::CreateAndReject(
                  LaunchError("UADC::CreateVideoBridge"), __func__);
            }
#endif
            PROFILER_MARKER_TEXT(
                "UtilityProcessManager::StartProcessForRemoteMediaDecoding",
                MEDIA,
                MarkerOptions(
                    MarkerTiming::IntervalUntilNowFrom(remoteDecodingStart)),
                "Resolve"_ns);
            return RetPromise::CreateAndResolve(std::move(childPipe), __func__);
          },
          [self, remoteDecodingStart](LaunchError&& error) {
            NS_WARNING(
                "Reject StartProcessForRemoteMediaDecoding() for "
                "StartUtility() rejection");
            PROFILER_MARKER_TEXT(
                "UtilityProcessManager::StartProcessForRemoteMediaDecoding",
                MEDIA,
                MarkerOptions(
                    MarkerTiming::IntervalUntilNowFrom(remoteDecodingStart)),
                "Reject"_ns);
            return RetPromise::CreateAndReject(std::move(error), __func__);
          });
}

RefPtr<UtilityProcessManager::JSOraclePromise>
UtilityProcessManager::StartJSOracle(dom::JSOracleParent* aParent) {
  using RetPromise = JSOraclePromise;
  return StartUtility(RefPtr{aParent}, SandboxingKind::GENERIC_UTILITY)
      ->Then(
          GetCurrentSerialEventTarget(), __func__,
          []() { return RetPromise::CreateAndResolve(true, __func__); },
          [](LaunchError const&) {
            return RetPromise::CreateAndReject(NS_ERROR_NOT_AVAILABLE,
                                               __func__);
          });
}

#ifdef XP_WIN

// Windows Utils

RefPtr<UtilityProcessManager::WindowsUtilsPromise>
UtilityProcessManager::GetWindowsUtilsPromise() {
  TimeStamp windowsUtilsStart = TimeStamp::Now();
  RefPtr<UtilityProcessManager> self = this;
  if (!mWindowsUtils) {
    mWindowsUtils = new dom::WindowsUtilsParent();
  }

  RefPtr<dom::WindowsUtilsParent> wup = mWindowsUtils;
  MOZ_ASSERT(wup, "Unable to get a singleton for WindowsUtils");
  return StartUtility(wup, SandboxingKind::WINDOWS_UTILS)
      ->Then(
          GetMainThreadSerialEventTarget(), __func__,
          [self, wup, windowsUtilsStart]() {
            if (!wup->CanSend()) {
              MOZ_ASSERT(false, "WindowsUtilsParent can't send");
              return WindowsUtilsPromise::CreateAndReject(
                  LaunchError("GetWindowsUtilsPromise: !wup->CanSend()"),
                  __func__);
            }
            PROFILER_MARKER_TEXT(
                "UtilityProcessManager::GetWindowsUtilsPromise", OTHER,
                MarkerOptions(
                    MarkerTiming::IntervalUntilNowFrom(windowsUtilsStart)),
                "Resolve"_ns);
            return WindowsUtilsPromise::CreateAndResolve(wup, __func__);
          },
          [self, windowsUtilsStart](LaunchError&& error) {
            NS_WARNING("StartUtility rejected promise for PWindowsUtils");
            PROFILER_MARKER_TEXT(
                "UtilityProcessManager::GetWindowsUtilsPromise", OTHER,
                MarkerOptions(
                    MarkerTiming::IntervalUntilNowFrom(windowsUtilsStart)),
                "Reject"_ns);
            return WindowsUtilsPromise::CreateAndReject(std::move(error),
                                                        __func__);
          });
}

void UtilityProcessManager::ReleaseWindowsUtils() { mWindowsUtils = nullptr; }

RefPtr<UtilityProcessManager::WinFileDialogPromise>
UtilityProcessManager::CreateWinFileDialogActor() {
  using RetPromise = WinFileDialogPromise;
  TimeStamp startTime = TimeStamp::Now();
  auto wfdp = MakeRefPtr<widget::filedialog::WinFileDialogParent>();

  return StartUtility(wfdp, SandboxingKind::WINDOWS_FILE_DIALOG)
      ->Then(
          GetMainThreadSerialEventTarget(), __PRETTY_FUNCTION__,
          [wfdp, startTime]() mutable {
            LOGD("CreateWinFileDialogAsync() resolve: wfdp = [%p]", wfdp.get());
            if (!wfdp->CanSend()) {
              MOZ_ASSERT(false, "WinFileDialogParent can't send");
              return RetPromise::CreateAndReject(
                  LaunchError("CreateWinFileDialogActor: !wfdp->CanSend()"),
                  __PRETTY_FUNCTION__);
            }
            PROFILER_MARKER_TEXT(
                "UtilityProcessManager::CreateWinFileDialogAsync", OTHER,
                MarkerOptions(MarkerTiming::IntervalUntilNowFrom(startTime)),
                "Resolve"_ns);

            return RetPromise::CreateAndResolve(
                widget::filedialog::ProcessProxy(std::move(wfdp)),
                __PRETTY_FUNCTION__);
          },
          [self = RefPtr(this), startTime](LaunchError&& error) {
            LOGD("CreateWinFileDialogAsync() reject");
            if (!self->IsShutdown()) {
              MOZ_ASSERT_UNREACHABLE("failure when starting file-dialog actor");
            }
            PROFILER_MARKER_TEXT(
                "UtilityProcessManager::CreateWinFileDialogAsync", OTHER,
                MarkerOptions(MarkerTiming::IntervalUntilNowFrom(startTime)),
                "Reject"_ns);

            return RetPromise::CreateAndReject(std::move(error),
                                               __PRETTY_FUNCTION__);
          });
}

#endif  // XP_WIN

bool UtilityProcessManager::IsProcessLaunching(SandboxingKind aSandbox) {
  MOZ_ASSERT(NS_IsMainThread());

  RefPtr<ProcessFields> p = GetProcess(aSandbox);
  if (!p) {
    MOZ_CRASH("Cannot check process launching with no process");
    return false;
  }

  return p->mProcess && !(p->mProcessParent);
}

bool UtilityProcessManager::IsProcessDestroyed(SandboxingKind aSandbox) {
  MOZ_ASSERT(NS_IsMainThread());
  RefPtr<ProcessFields> p = GetProcess(aSandbox);
  if (!p) {
    MOZ_CRASH("Cannot check process destroyed with no process");
    return false;
  }
  return !p->mProcess && !p->mProcessParent;
}

void UtilityProcessManager::OnProcessUnexpectedShutdown(
    UtilityProcessHost* aHost) {
  MOZ_ASSERT(NS_IsMainThread());

  for (auto& it : mProcesses) {
    if (it && it->mProcess && it->mProcess == aHost) {
      it->mNumUnexpectedCrashes++;
      DestroyProcess(it->mSandbox);
      return;
    }
  }

  MOZ_CRASH(
      "Called UtilityProcessManager::OnProcessUnexpectedShutdown with invalid "
      "aHost");
}

void UtilityProcessManager::CleanShutdownAllProcesses() {
  LOGD("[%p] UtilityProcessManager::CleanShutdownAllProcesses", this);

  for (auto& it : mProcesses) {
    if (it) {
      DestroyProcess(it->mSandbox);
    }
  }
}

void UtilityProcessManager::CleanShutdown(SandboxingKind aSandbox) {
  LOGD("[%p] UtilityProcessManager::CleanShutdown SandboxingKind=%" PRIu64,
       this, aSandbox);

  DestroyProcess(aSandbox);
}

uint16_t UtilityProcessManager::AliveProcesses() {
  uint16_t alive = 0;
  for (auto& p : mProcesses) {
    if (p != nullptr) {
      alive++;
    }
  }
  return alive;
}

bool UtilityProcessManager::NoMoreProcesses() { return AliveProcesses() == 0; }

void UtilityProcessManager::DestroyProcess(SandboxingKind aSandbox) {
  LOGD("[%p] UtilityProcessManager::DestroyProcess SandboxingKind=%" PRIu64,
       this, aSandbox);

  MOZ_RELEASE_ASSERT(NS_IsMainThread());

  if (AliveProcesses() <= 1) {
    if (mObserver) {
      Preferences::RemoveObserver(mObserver, "");
    }

    mObserver = nullptr;
  }

  RefPtr<ProcessFields> p = GetProcess(aSandbox);
  if (!p) {
    return;
  }

  p->mQueuedPrefs.Clear();
  p->mProcessParent = nullptr;

  if (!p->mProcess) {
    return;
  }

  p->mProcess->Shutdown();
  p->mProcess = nullptr;

  mProcesses[aSandbox] = nullptr;

  CrashReporter::RecordAnnotationCString(
      CrashReporter::Annotation::UtilityProcessStatus, "Destroyed");

  if (NoMoreProcesses()) {
    sSingleton = nullptr;
  }
}

Maybe<base::ProcessId> UtilityProcessManager::ProcessPid(
    SandboxingKind aSandbox) {
  MOZ_ASSERT(NS_IsMainThread());
  RefPtr<ProcessFields> p = GetProcess(aSandbox);
  if (!p) {
    return Nothing();
  }
  if (p->mProcessParent) {
    return Some(p->mProcessParent->OtherPid());
  }
  return Nothing();
}

class UtilityMemoryReporter : public MemoryReportingProcess {
public:
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(UtilityMemoryReporter, override)

  explicit UtilityMemoryReporter(UtilityProcessParent* aParent) {
    mParent = aParent;
  }

  bool IsAlive() const override { return bool(GetParent()); }

  bool SendRequestMemoryReport(
      const uint32_t& aGeneration, const bool& aAnonymize,
      const bool& aMinimizeMemoryUsage,
      const Maybe<ipc::FileDescriptor>& aDMDFile) override {
    RefPtr<UtilityProcessParent> parent = GetParent();
    if (!parent) {
      return false;
    }

    return parent->SendRequestMemoryReport(aGeneration, aAnonymize,
                                           aMinimizeMemoryUsage, aDMDFile);
  }

  int32_t Pid() const override {
    if (RefPtr<UtilityProcessParent> parent = GetParent()) {
      return (int32_t)parent->OtherPid();
    }
    return 0;
  }

private:
  RefPtr<UtilityProcessParent> GetParent() const { return mParent; }

  RefPtr<UtilityProcessParent> mParent = nullptr;

protected:
  ~UtilityMemoryReporter() = default;
};

RefPtr<MemoryReportingProcess> UtilityProcessManager::GetProcessMemoryReporter(
    UtilityProcessParent* parent) {
  return new UtilityMemoryReporter(parent);
}

}  // namespace mozilla::ipc

quality96%

¤ Dauer der Verarbeitung: 0.18 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.