ipc/unixfd/UnixFdWatcher.h

   1 /* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
   2 /* vim: set ts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_ipc_UnixFdWatcher_h
   8 #define mozilla_ipc_UnixFdWatcher_h
   9
  10 #include "base/message_loop.h"
  11 #include "mozilla/FileUtils.h"
  12
  13 namespace mozilla {
  14 namespace ipc {
  15
  16 class UnixFdWatcher : public MessageLoopForIO::Watcher
  17 {
  18 public:
  19   enum {
  20     READ_WATCHER = 1<<0,
  21     WRITE_WATCHER = 1<<1
  22   };
  23
  24   virtual ~UnixFdWatcher();
  25
  26   MessageLoop* GetIOLoop() const
  27   {
  28     return mIOLoop;
  29   }
  30
  31   int GetFd() const
  32   {
  33     return mFd;
  34   }
  35
  36   bool IsOpen() const
  37   {
  38     return GetFd() >= 0;
  39   }
  40
  41   virtual void Close();
  42
  43   void AddWatchers(unsigned long aWatchers, bool aPersistent);
  44   void RemoveWatchers(unsigned long aWatchers);
  45
  46   // Callback method that's run before closing the file descriptor
  47   virtual void OnClose() {};
  48
  49   // Callback method that's run on POSIX errors
  50   virtual void OnError(const char* aFunction, int aErrno);
  51
  52 protected:
  53   UnixFdWatcher(MessageLoop* aIOLoop);
  54   UnixFdWatcher(MessageLoop* aIOLoop, int aFd);
  55   void SetFd(int aFd);
  56
  57 private:
  58   static bool FdIsNonBlocking(int aFd);
  59
  60   MessageLoop* mIOLoop;
  61   ScopedClose mFd;
  62   MessageLoopForIO::FileDescriptorWatcher mReadWatcher;
  63   MessageLoopForIO::FileDescriptorWatcher mWriteWatcher;
  64 };
  65
  66 }
  67 }
  68
  69 #endif