Native Client side changes for debugging support: stdout/err -> postmessage.

src/trusted/service_runtime/nacl_desc_postmessage.h

+/*
+ * Copyright (c) 2011 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/*
+ * Subclass of NaClDesc which passes write output data to the
+ * JavaScript console using the reverse channel.
+ */
+
+#ifndef NATIVE_CLIENT_SRC_TRUSTED_SERVICE_RUNTIME_NACL_DESC_JSCONSOLE_H_
+#define NATIVE_CLIENT_SRC_TRUSTED_SERVICE_RUNTIME_NACL_DESC_JSCONSOLE_H_
+
+#include "native_client/src/include/nacl_base.h"
+#include "native_client/src/include/portability.h"
+
+#include "native_client/src/trusted/desc/nacl_desc_base.h"
+
+EXTERN_C_BEGIN
+
+struct NaClDescEffector;
+struct NaClDescXferState;
+struct NaClMessageHeader;
+
+/*
+ * A NaClDesc subclass that passes Write data to the browser via
+ * postmessage.  Objects of this class should be instantiated only if
+ * the NaClApp object's reverse channel is available.
+ *
+ * This is a DEBUG interface to make it easier to determine the state
+ * of a NaCl application.  The interface is enabled only when a debug
+ * environment variable is set.
+ */
+struct NaClDescPostMessage {
+  struct NaClDesc base NACL_IS_REFCOUNT_SUBCLASS;
+
+  /*
+   * There is not much state associated with sending a write buffer to
+   * the plugin via RPC -- just behavior changes in the virtual Write
+   * function; all state is in the NaClApp object.  it is assumed that
+   * the lifetime of the pointed-to NaClApp object is at least that of
+   * this NaClDescPostMessage object.
+   */
+  struct NaClApp  *nap;
+  ssize_t         error;
+};
+
+int NaClDescPostMessageCtor(struct NaClDescPostMessage  *self,
+                            struct NaClApp              *nap);
+
+
+
+EXTERN_C_END
+
+#endif