[NaCl SDK] nacl_io: Add flow control the JavaScript pipes.

native_client_sdk/src/libraries/nacl_io/ioctl.h

Index: native_client_sdk/src/libraries/nacl_io/ioctl.h
diff --git a/native_client_sdk/src/libraries/nacl_io/ioctl.h b/native_client_sdk/src/libraries/nacl_io/ioctl.h
index e2b0ada77aeac7353f1e5e7d704ee47a6caa8b85..15cc467cebf028aae037667fb3e106305728e6e9 100644
--- a/native_client_sdk/src/libraries/nacl_io/ioctl.h
+++ b/native_client_sdk/src/libraries/nacl_io/ioctl.h
@@ -33,9 +33,23 @@
  * unique prefix.  Until a prefix is set on a given pipe any I/O operations
  * will return EIO.
  */
-#define TIOCNACLPIPENAME 0xadcd04
+#define NACL_IOC_PIPE_SETNAME 0xadcd04
 
-typedef char* tioc_nacl_jspipe_name;
+/*
+ * Find out how much space is available in a nacl_io pipe.
+ * Argument type is "int*" which will be set to the amount of space in the
+ * pipe in bytes.
+ */
+#define NACL_IOC_PIPE_GETOSPACE 0xadcd06
+#define NACL_IOC_PIPE_GETISPACE 0xadcd07
+
+/*
+ * ioctl used to pass messages from JavaScript to a jspipe node.
+ * Argument type is "struct PP_Var*".
+ */
+#define NACL_IOC_HANDLEMESSAGE 0xadcd05
+
+typedef char* naclioc_jspipe_name;
 
 struct tioc_nacl_input_string {
   size_t length;