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

native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc

Index: native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc b/native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc
index cb517347afa5882839f57d115923017af76bbe6d..304017aa7f3dde91c398e4ea9c573f8fb0a83514 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc
@@ -21,7 +21,9 @@ using namespace nacl_io;
     return x;                 \
   }
 
+static ScopedKernelProxy* s_scoped_kp;
 static KernelProxy* s_kp;
+static bool s_kp_owned;
 
 void ki_init(void* kp) {
   ki_init_ppapi(kp, 0, NULL);
@@ -32,8 +34,15 @@ void ki_init_ppapi(void* kp,
                    PPB_GetInterface get_browser_interface) {
   kernel_wrap_init();
 
-  if (kp == NULL) kp = new KernelProxy();
-  s_kp = static_cast<KernelProxy*>(kp);
+  if (kp == NULL) {
+    s_kp = new KernelProxy();
+    s_kp_owned = true;
+  } else {
+    s_kp = static_cast<KernelProxy*>(kp);
+    s_kp_owned = false;
+  }
+
+  s_scoped_kp = new ScopedKernelProxy(s_kp);
 
   PepperInterface* ppapi = NULL;
   if (instance && get_browser_interface)
@@ -48,7 +57,10 @@ int ki_is_initialized() {
 
 void ki_uninit() {
   kernel_wrap_uninit();
+  if (s_kp_owned)
+    delete s_scoped_kp;
   s_kp = NULL;
+  s_scoped_kp = NULL;
 }
 
 int ki_chdir(const char* path) {
@@ -257,6 +269,21 @@ int ki_tcsetattr(int fd, int optional_actions,
   return s_kp->tcsetattr(fd, optional_actions, termios_p);
 }
 
+int ki_kill(pid_t pid, int sig) {
+  ON_NOSYS_RETURN(-1);
+  return s_kp->kill(pid, sig);
+}
+
+sighandler_t ki_signal(int signum, sighandler_t handler) {
+  ON_NOSYS_RETURN(SIG_ERR);
+  return s_kp->sigset(signum, handler);
+}
+
+sighandler_t ki_sigset(int signum, sighandler_t handler) {
+  ON_NOSYS_RETURN(SIG_ERR);
+  return s_kp->sigset(signum, handler);
+}
+
 #ifdef PROVIDES_SOCKET_API
 // Socket Functions
 int ki_accept(int fd, struct sockaddr* addr, socklen_t* len) {