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

native_client_sdk/src/libraries/nacl_io/ioctl.h

 /* Copyright 2013 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_IOCTL_H_
 #define LIBRARIES_NACL_IO_IOCTL_H_
 
 #include <sys/types.h>
 
 /*
@@ skipping 15 matching lines @@
 #define TIOCNACLOUTPUT 0xadcd03
 
 /*
  * ioctl used to set a name for a JavaScript pipe.  The name
  * is a string that is used to uniquely identify messages posted to and from
  * JavaScript which signifies that the message is destined for a
  * particular pipe device.  For this reason each device must have a
  * 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;
   const char* buffer;
 };
 
 
 typedef ssize_t (*tioc_nacl_output_handler_t)(const char* buf,
                                               size_t count,
                                               void* user_data);
 
 struct tioc_nacl_output {
   tioc_nacl_output_handler_t handler;
   void* user_data;
 };
 
 
 #endif  /* LIBRARIES_NACL_IO_NACL_IO_H_ */