[NaCl SDK] nacl_io: Add initial implementations of kill and signal

native_client_sdk/src/libraries/nacl_io/kernel_proxy.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef LIBRARIES_NACL_IO_KERNEL_PROXY_H_
 #define LIBRARIES_NACL_IO_KERNEL_PROXY_H_
 
 #include <map>
 #include <string>
 
 #include "nacl_io/host_resolver.h"
 #include "nacl_io/kernel_object.h"
 #include "nacl_io/mount_factory.h"
 #include "nacl_io/mount_socket.h"
 #include "nacl_io/ossignal.h"
 #include "nacl_io/ossocket.h"
 #include "nacl_io/ostypes.h"
 #include "nacl_io/osutime.h"
 
 struct timeval;
 
 namespace nacl_io {
 
 class PepperInterface;
+class SignalEmitter;
+
+typedef sdk_util::ScopedRef<SignalEmitter> ScopedSignalEmitter;
 
 // KernelProxy provide one-to-one mapping for libc kernel calls.  Calls to the
 // proxy will result in IO access to the provided Mount and MountNode objects.
 //
 // NOTE: The KernelProxy does not directly take any kernel locks, all locking
 // is done by the parent class KernelObject.  Instead, KernelProxy is
 // responsible for taking the locks of the KernelHandle, and MountNode objects.
 // For this reason, a KernelObject call should not be done while holding
 // a handle or node lock.  In addition, to ensure locking order,
 // a KernelHandle lock must never be taken after taking the associated
@@ skipping 141 matching lines @@
   virtual int socket(int domain, int type, int protocol);
   virtual int socketpair(int domain, int type, int protocol, int* sv);
 #endif  // PROVIDES_SOCKET_API
 
  protected:
   MountFactoryMap_t factories_;
   sdk_util::ScopedRef<MountSocket> socket_mount_;
   int dev_;
   PepperInterface* ppapi_;
   static KernelProxy *s_instance_;
+  sighandler_t sigwinch_handler_;
 #ifdef PROVIDES_SOCKET_API
   HostResolver host_resolver_;
 #endif
 
 #ifdef PROVIDES_SOCKET_API
   virtual int AcquireSocketHandle(int fd, ScopedKernelHandle* handle);
 #endif
 
+  ScopedSignalEmitter signal_emitter_;
   DISALLOW_COPY_AND_ASSIGN(KernelProxy);
 };
 
 }  // namespace nacl_io
 
 #endif  // LIBRARIES_NACL_IO_KERNEL_PROXY_H_