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

native_client_sdk/src/libraries/nacl_io/kernel_proxy.h

Index: native_client_sdk/src/libraries/nacl_io/kernel_proxy.h
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_proxy.h b/native_client_sdk/src/libraries/nacl_io/kernel_proxy.h
index 21d68c1de5216e3594603c61e8eb12a4f02fa2cd..a7772462006d2195372ca237dbbc6073daac3b7e 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_proxy.h
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_proxy.h
@@ -12,6 +12,7 @@
 #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"
@@ -35,7 +36,7 @@ class PepperInterface;
 //
 // NOTE: The KernelProxy is the only class that should be setting errno. All
 // other classes should return Error (as defined by nacl_io/error.h).
-class KernelProxy : protected KernelObject {
+class KernelProxy : public KernelObject {
  public:
   typedef std::map<std::string, MountFactory*> MountFactoryMap_t;
 
@@ -125,6 +126,9 @@ class KernelProxy : protected KernelObject {
   virtual int tcsetattr(int fd, int optional_actions,
                            const struct termios *termios_p);
 
+  virtual int kill(pid_t pid, int sig);
+  virtual sighandler_t sigset(int signum, sighandler_t handler);
+
 #ifdef PROVIDES_SOCKET_API
   virtual int select(int nfds, fd_set* readfds, fd_set* writefds,
                     fd_set* exceptfds, struct timeval* timeout);
@@ -179,6 +183,7 @@ class KernelProxy : protected KernelObject {
   int dev_;
   PepperInterface* ppapi_;
   static KernelProxy *s_instance_;
+  sighandler_t sigwinch_handler_;
 #ifdef PROVIDES_SOCKET_API
   HostResolver host_resolver_;
 #endif
@@ -190,6 +195,8 @@ class KernelProxy : protected KernelObject {
   DISALLOW_COPY_AND_ASSIGN(KernelProxy);
 };
 
+typedef sdk_util::ScopedRef<KernelProxy> ScopedKernelProxy;
+
 }  // namespace nacl_io
 
 #endif  // LIBRARIES_NACL_IO_KERNEL_PROXY_H_