[NaCl SDK] nacl_io: add return value to nacl_io_init.

native_client_sdk/src/libraries/nacl_io/nacl_io.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_NACL_IO_H_
 #define LIBRARIES_NACL_IO_NACL_IO_H_
 
 #include <ppapi/c/pp_instance.h>
 #include <ppapi/c/ppb.h>
 
@@ skipping 11 matching lines @@
                                          const void* data,
                                          dev_t dev,
                                          void* user_data);
 
 /**
  * Initialize nacl_io.
  *
  * NOTE: If you initialize nacl_io with this constructor, you cannot
  * use any filesystems that require PPAPI; e.g. persistent storage, etc.
  */
-void nacl_io_init();
+int nacl_io_init();
 
 /**
  * Initialize nacl_io with PPAPI support.
  *
  * Usage:
  *   PP_Instance instance;
  *   PPB_GetInterface get_interface;
  *   nacl_io_init(instance, get_interface);
  *
  * If you are using the PPAPI C interface:
  *   |instance| is passed to your instance in the DidCreate function.
  *   |get_interface| is passed to your module in the PPP_InitializeModule
  *   function.
  *
  * If you are using the PPAPI C++ interface:
  *   |instance| can be retrieved via the pp::Instance::pp_instance() method.
  *   |get_interface| can be retrieved via
  *       pp::Module::Get()->get_browser_interface()
  */
-void nacl_io_init_ppapi(PP_Instance instance, PPB_GetInterface get_interface);
+int nacl_io_init_ppapi(PP_Instance instance, PPB_GetInterface get_interface);
 
 /**
  * Uninitialize nacl_io.
  *
  * This removes interception for POSIX C-library function and releases
  * any associated resources.
  */
-void nacl_io_uninit();
+int nacl_io_uninit();
 
 void nacl_io_set_exit_callback(nacl_io_exit_callback_t exit_callback,
                                void* user_data);
 
 /**
  * Mount a new filesystem type.
  *
  * This function is declared in <sys/mount.h>, but we document it here
  * because nacl_io is controlled primarily through mount(2)/umount(2).
  *
@@ skipping 142 matching lines @@
  * @param[in] callback The callback to set, or NULL.
  * @param[in] user_data User data that will be passed to the callback.
  * @return 0 on success, -1 on failure.
  */
 void nacl_io_set_mount_callback(nacl_io_mount_callback_t callback,
                                 void* user_data);
 
 EXTERN_C_END
 
 #endif /* LIBRARIES_NACL_IO_NACL_IO_H_ */