You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/rustdesk/src/plugin
    
    the code of the file until where you have to start completion: use hbb_common::{bail, libc, log, ResultType};
#[cfg(target_os = "windows")]
use std::env;
use std::{
    ffi::{c_char, c_int, c_void, CStr},
    path::PathBuf,
    ptr::null,
};

mod callback_ext;
mod callback_msg;
mod config;
pub mod desc;
mod errno;
pub mod ipc;
mod manager;
pub mod native;
pub mod native_handlers;
mod plog;
mod plugins;

pub use manager::{
    install::{change_uninstall_plugin, install_plugin_with_url},
    install_plugin, load_plugin_list, remove_uninstalled, uninstall_plugin,
};
pub use plug
    
    pub fn get_code_msg(&mut self, id: &str) -> (i32, String) {
        if self.is_success() {
            (self.code, "".to_owned())
        } else {
            if self.msg.is_null() {
                log::warn!(
                    "The message pointer from the plugin '{}' is null, but the error code is {}",
                    id,
                    self.code
                );
                return (self.code, "".to_owned());
            }
            let msg = cstr_to_string(self.msg).unwrap_or_default();
            free_c_ptr(self.msg as _);
            self.msg = null();
            (self.code as _, msg)
        }
    }