set up arg array in lua

src/main.rs

@@ -44,14 +44,22 @@ extern "C" fn handle_sigchld(_: libc::c_int) {
 
 fn fork_lua(lua : &Lua, args: Vec<String>, fds: Vec<i32>) -> Option<i32> {
     let pathname = &args[0];
-
     let path = Path::new(pathname);
+
     match fork() {
         Ok(Fork::Parent(pid)) => Some(pid),
         Ok(Fork::Child) => {
             for (i, fd) in fds.iter().enumerate() {
                 unsafe { libc::dup2(*fd, i.try_into().unwrap()); }
             };
+            let globals = lua.globals();
+            if let Ok(arg_table) = lua.create_table() {
+                for (i, arg) in args.iter().enumerate() {
+                    arg_table.set(i, arg.clone());
+                }
+                globals.set("arg".to_string(), arg_table);
+            }
+
             let chunk = lua.load(path);
             match chunk.exec() {
                 Ok(()) => { exit(0); },