diff --git a/src/entry/mod.rs b/src/entry/mod.rs
index b9d6444..5414639 100644
--- a/src/entry/mod.rs
+++ b/src/entry/mod.rs
@@ -1,3 +1,53 @@
+/* 
+ * Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
+ * SPDX-License-Identifier: LGPL-3.0-or-later
+ *
+ * This file is part of yacexits.
+ *
+ * Yacexits is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * Yacexits is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with yacexits. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and permission
+ * notice:
+ *
+ *     Copyright 2023 Douman
+ *
+ *     Boost Software License - Version 1.0 - August 17th, 2003
+ *
+ *     Permission is hereby granted, free of charge, to any person or
+ *     organization obtaining a copy of the software and accompanying
+ *     documentation covered by this license (the "Software") to use, reproduce,
+ *     display, distribute, execute, and transmit the Software, and to prepare
+ *     derivative works of the Software, and to permit third-parties to whom the
+ *     Software is furnished to do so, all subject to the following:
+ *
+ *     The copyright notices in the Software and this entire statement,
+ *     including the above license grant, this restriction and the following 
+ *     disclaimer, must be included in all copies of the Software, in whole or 
+ *     in part, and all derivative works of the Software, unless such copies or
+ *     derivative works are solely in the form of machine-executable object code
+ *     generated by a source language processor.
+ *
+ *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
+ *     OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND 
+ *     NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE
+ *     DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER LIABILITY,
+ *     WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *     CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *     SOFTWARE.
+ */
+
 mod args;
 mod errors;
 pub use args::Args;
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..77d7151
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,14 @@
+#![no_main]
+
+use yacexits::*;
+
+#[no_mangle]
+fn rust_main(args: Args,) -> Result<u32, (String, u32)> {
+  let argv = args.into_iter().collect::<Vec<&str>>();
+  for (i, arg) in argv.iter().enumerate() {
+    println!("argv[{}]: {}", i, arg)
+  }
+  let (message, code) = ("bingus".to_string(), EX_USAGE);
+  let error = YacError { message, code };
+  Err(<(String, u32)>::from(error))
+}