diff --git a/src/binding.rs b/src/binding.rs
new file mode 100644
index 0000000000..62d727627b
--- /dev/null
+++ b/src/binding.rs
@@ -0,0 +1,50 @@
+// Copyright 2018 Ryan Dahl <ry@tinyclouds.org>
+// All rights reserved. MIT License.
+#![allow(dead_code)]
+
+extern crate libc;
+use libc::c_char;
+use libc::c_int;
+use libc::c_void;
+use libc::uint32_t;
+
+#[repr(C)]
+pub struct DenoC {
+    _unused: [u8; 0],
+}
+
+#[repr(C)]
+pub struct deno_buf {
+    alloc_ptr: *mut u8,
+    alloc_len: usize,
+    data_ptr: *mut u8,
+    data_len: usize,
+}
+
+type DenoRecvCb = unsafe extern "C" fn(d: *const DenoC, buf: deno_buf);
+
+extern "C" {
+    pub fn deno_init();
+    pub fn deno_v8_version() -> *const c_char;
+    pub fn deno_set_flags(argc: *mut c_int, argv: *mut *mut c_char);
+    pub fn deno_new(data: *const c_void, cb: DenoRecvCb) -> *const DenoC;
+    pub fn deno_delete(d: *const DenoC);
+    pub fn deno_last_exception(d: *const DenoC) -> *const c_char;
+    pub fn deno_set_response(d: *const DenoC, buf: deno_buf);
+    pub fn deno_execute(
+        d: *const DenoC,
+        js_filename: *const c_char,
+        js_source: *const c_char,
+    ) -> c_int;
+    pub fn deno_handle_msg_from_js(d: *const DenoC, buf: deno_buf);
+    pub fn deno_reply_error(d: *const DenoC, cmd_id: uint32_t, msg: *const c_char);
+    pub fn deno_reply_null(d: *const DenoC, cmd_id: uint32_t);
+    pub fn deno_reply_code_fetch(
+        d: *const DenoC,
+        cmd_id: uint32_t,
+        module_name: *const c_char,
+        filename: *const c_char,
+        source_code: *const c_char,
+        output_code: *const c_char,
+    );
+}
diff --git a/src/handlers.rs b/src/handlers.rs
index a9221a8cb2..8929d79de0 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -6,7 +6,6 @@ extern crate log;
 extern crate url;
 
 use libc::c_char;
-use libc::uint32_t;
 use std::ffi::CStr;
 use std::ffi::CString;
 use std::fs::File;
@@ -14,26 +13,8 @@ use std::io::Read;
 use std::path::Path;
 use url::Url;
 
-// TODO(ry) Share this with the def in src/main.rs.
-#[repr(C)]
-pub struct DenoC {
-    _unused: [u8; 0],
-}
-
-// TODO(ry) Share this extern block with those in main.rs.
-// See src/reply.h
-extern "C" {
-    pub fn deno_reply_error(d: *const DenoC, cmd_id: uint32_t, msg: *const c_char);
-    pub fn deno_reply_null(d: *const DenoC, cmd_id: uint32_t);
-    pub fn deno_reply_code_fetch(
-        d: *const DenoC,
-        cmd_id: uint32_t,
-        module_name: *const c_char,
-        filename: *const c_char,
-        source_code: *const c_char,
-        output_code: *const c_char,
-    );
-}
+mod binding;
+use binding::{deno_reply_code_fetch, deno_reply_error, DenoC};
 
 // TODO(ry) SRC_DIR is just a placeholder for future caching functionality.
 static SRC_DIR: &str = "/Users/rld/.deno/src/";
diff --git a/src/main.rs b/src/main.rs
index 3af2994284..e1284d3039 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,45 +2,14 @@ extern crate libc;
 #[macro_use]
 extern crate log;
 
-use libc::c_char;
 use libc::c_int;
-use libc::c_void;
 use std::ffi::CStr;
 use std::ffi::CString;
 use std::ptr;
 
-#[repr(C)]
-struct deno_buf {
-    alloc_ptr: *mut u8,
-    alloc_len: usize,
-    data_ptr: *mut u8,
-    data_len: usize,
-}
-
-#[repr(C)]
-struct DenoC {
-    _unused: [u8; 0],
-}
-
-type DenoRecvCb = unsafe extern "C" fn(d: *const DenoC, buf: deno_buf);
-
-#[link(name = "deno", kind = "static")]
-extern "C" {
-    fn deno_init();
-    #[allow(dead_code)]
-    fn deno_v8_version() -> *const c_char;
-    fn deno_set_flags(argc: *mut c_int, argv: *mut *mut c_char);
-
-    fn deno_new(data: *const c_void, cb: DenoRecvCb) -> *const DenoC;
-    fn deno_delete(d: *const DenoC);
-    fn deno_last_exception(d: *const DenoC) -> *const c_char;
-    #[allow(dead_code)]
-    fn deno_set_response(d: *const DenoC, buf: deno_buf);
-    fn deno_execute(d: *const DenoC, js_filename: *const c_char, js_source: *const c_char)
-        -> c_int;
-
-    fn deno_handle_msg_from_js(d: *const DenoC, buf: deno_buf);
-}
+mod binding;
+use binding::{deno_delete, deno_execute, deno_handle_msg_from_js, deno_init, deno_last_exception,
+              deno_new, deno_set_flags, DenoC};
 
 // Pass the command line arguments to v8.
 // Returns a vector of command line arguments that v8 did not understand.