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Minimal test - lines (168, 182)

Code

class nsDumpUtils {
 public:
  enum Mode { CREATE, CREATE_UNIQUE };

  /**
   * This function creates a new unique file based on |aFilename| in a
   * world-readable temp directory. This is the system temp directory
   * or, in the case of Android, the downloads directory. If |aFile| is
   * non-null, it is assumed to point to a folder, and that folder is used
   * instead.
   */
  static nsresult OpenTempFile(const nsACString& aFilename, nsIFile** aFile,
                               const nsACString& aFoldername = ""_ns,
                               Mode aMode = CREATE_UNIQUE);
};

Minimal test - lines (98, 130)

Code

class FifoWatcher : public FdWatcher {
 public:
  /**
   * The name of the preference used to enable/disable the FifoWatcher.
   */
  // The length of this array must match the size of the string constant in
  // the definition in nsDumpUtils.cpp. A mismatch will result in a compile-time
  // error.
  static const char kPrefName[38];

  static FifoWatcher* GetSingleton();

  static bool MaybeCreate();

  void RegisterCallback(const nsCString& aCommand, FifoCallback aCallback);

  virtual ~FifoWatcher();

  virtual int OpenFd() override;

  virtual void OnFileCanReadWithoutBlocking(int aFd) override;

 private:
  nsAutoCString mDirPath;

  static mozilla::StaticRefPtr sSingleton;

  explicit FifoWatcher(nsCString aPath)
      : mDirPath(aPath), mFifoInfoLock("FifoWatcher.mFifoInfoLock") {}

  mozilla::Mutex mFifoInfoLock;  // protects mFifoInfo
  FifoInfoArray mFifoInfo;
};

Minimal test - lines (36, 89)

Code

class FdWatcher : public MessageLoopForIO::Watcher, public nsIObserver {
 protected:
  MessageLoopForIO::FileDescriptorWatcher mReadWatcher;
  int mFd;

  virtual ~FdWatcher() {
    // StopWatching should have run.
    MOZ_ASSERT(mFd == -1);
  }

 public:
  FdWatcher() : mFd(-1) { MOZ_ASSERT(NS_IsMainThread()); }

  /**
   * Open the fd to watch.  If we encounter an error, return -1.
   */
  virtual int OpenFd() = 0;

  /**
   * Called when you can read() from the fd without blocking.  Note that this
   * function is also called when you're at eof (read() returns 0 in this case).
   */
  virtual void OnFileCanReadWithoutBlocking(int aFd) override = 0;
  virtual void OnFileCanWriteWithoutBlocking(int aFd) override{};

  NS_DECL_THREADSAFE_ISUPPORTS

  /**
   * Initialize this object.  This should be called right after the object is
   * constructed.  (This would go in the constructor, except we interact with
   * XPCOM, which we can't do from a constructor because our refcount is 0 at
   * that point.)
   */
  void Init();

  // Implementations may call this function multiple times if they ensure that

  virtual void StartWatching();

  // Since implementations can call StartWatching() multiple times, they can of
  // course call StopWatching() multiple times.
  virtual void StopWatching();

  NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,
                     const char16_t* aData) override {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(!strcmp(aTopic, "xpcom-shutdown"));

    XRE_GetIOMessageLoop()->PostTask(mozilla::NewRunnableMethod(
        "FdWatcher::StopWatching", this, &FdWatcher::StopWatching));

    return NS_OK;
  }
};

Minimal test - lines (92, 95)

Code

struct FifoInfo {
  nsCString mCommand;
  FifoCallback mCallback;
};

Minimal test - lines (139, 164)

Code

class SignalPipeWatcher : public FdWatcher {
 public:
  static SignalPipeWatcher* GetSingleton();

  void RegisterCallback(uint8_t aSignal, PipeCallback aCallback);

  void RegisterSignalHandler(uint8_t aSignal = 0);

  virtual ~SignalPipeWatcher();

  virtual int OpenFd() override;

  virtual void StopWatching() override;

  virtual void OnFileCanReadWithoutBlocking(int aFd) override;

 private:
  static mozilla::StaticRefPtr sSingleton;

  SignalPipeWatcher() : mSignalInfoLock("SignalPipeWatcher.mSignalInfoLock") {
    MOZ_ASSERT(NS_IsMainThread());
  }

  mozilla::Mutex mSignalInfoLock;  // protects mSignalInfo
  SignalInfoArray mSignalInfo;
};

Minimal test - lines (133, 136)

Code

struct SignalInfo {
  uint8_t mSignal;
  PipeCallback mCallback;
};