node-api: minimal C node embedding API function

node.gyp

@@ -113,6 +113,8 @@
       'src/node_dir.cc',
       'src/node_dotenv.cc',
       'src/node_env_var.cc',
+      'src/node_embedding_api.cc',
+      'src/node_embedding_api.h',
       'src/node_errors.cc',
       'src/node_external_reference.cc',
       'src/node_file.cc',

src/node_embedding_api.cc

@@ -0,0 +1,26 @@
+//
+// Description: C-based API for embedding Node.js.
+//
+// !!! WARNING !!! WARNING !!! WARNING !!!
+// This is a new API and is subject to change.
+// While it is C-based, it is not ABI safe yet.
+// Consider all functions and data structures as experimental.
+// !!! WARNING !!! WARNING !!! WARNING !!!
+//
+// This file contains the C-based API for embedding Node.js in a host
+// application. The API is designed to be used by applications that want to
+// embed Node.js as a shared library (.so or .dll) and can interop with
+// C-based API.
+//
+
+
+#include "node_embedding_api.h"
+#include "node.h"
+
+EXTERN_C_START
+
+int32_t NAPI_CDECL node_embedding_main(int32_t argc, char* argv[]) {
+  return node::Start(argc, argv);
+}
+
+EXTERN_C_END

src/node_embedding_api.h

@@ -0,0 +1,30 @@
+//
+// Description: C-based API for embedding Node.js.
+//
+// !!! WARNING !!! WARNING !!! WARNING !!!
+// This is a new API and is subject to change.
+// While it is C-based, it is not ABI safe yet.
+// Consider all functions and data structures as experimental.
+// !!! WARNING !!! WARNING !!! WARNING !!!
+//
+// This file contains the C-based API for embedding Node.js in a host
+// application. The API is designed to be used by applications that want to
+// embed Node.js as a shared library (.so or .dll) and can interop with
+// C-based API.
+//
+
+#ifndef SRC_NODE_EMBEDDING_API_H_
+#define SRC_NODE_EMBEDDING_API_H_
+
+#include "node_api.h"
+
+#define NODE_EMBEDDING_VERSION 1
+
+EXTERN_C_START
+
+// Runs Node.js main function. It is the same as running Node.js from CLI.
+NAPI_EXTERN int32_t NAPI_CDECL node_embedding_main(int32_t argc, char* argv[]);
+
+EXTERN_C_END
+
+#endif  // SRC_NODE_EMBEDDING_API_H_