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README
MIT

dlopen2

CI crates.io Documentation dependency status MIT

This is a fork of the original, now unmaintained dlopen with updated dependencies, bug fixes and some new features.

Overview

This library is my effort to make use of dynamic link libraries in Rust simple. Previously existing solutions were either unsafe, provided huge overhead of required writing too much code to achieve simple things. I hope that this library will help you to quickly get what you need and avoid errors.

Quick example

use dlopen2::wrapper::{Container, WrapperApi};

#[derive(WrapperApi)]
struct Api<'a> {
    example_rust_fun: fn(arg: i32) -> u32,
    example_c_fun: unsafe extern "C" fn(),
    example_reference: &'a mut i32,
    // A function or field may not always exist in the library.
    example_c_fun_option: Option<unsafe extern "C" fn()>,
    example_reference_option:  Option<&'a mut i32>,
}

fn main(){
    let mut cont: Container<Api> =
        unsafe { Container::load("libexample.so") }.expect("Could not open library or load symbols");
    cont.example_rust_fun(5);
    unsafe{ cont.example_c_fun() };
    *cont.example_reference_mut() = 5;
    
    // Optional functions return Some(result) if the function is present or None if absent.
    unsafe{ cont.example_c_fun_option() };
    // Optional fields are Some(value) if present and None if absent.
    if let Some(example_reference) = &mut cont.example_reference_option {
        *example_reference = 5;
    }
}

Features

Main features

  • Supports majority of platforms and is platform independent.
  • Is consistent with Rust error handling mechanism and makes making mistakes much more difficult.
  • Is very lightweight. It mostly uses zero cost wrappers to create safer abstractions over platform API.
  • Is thread safe.
  • Is object-oriented programming friendly.
  • Has a low-level API that provides full flexibility of using libraries.
  • Has two high-level APIs that protect against dangling symbols - each in its own way.
  • High level APIs support automatic loading of symbols into structures. You only need to define a structure that represents an API. The rest happens automatically and requires only minimal amount of code.
  • Automatic loading of symbols helps you to follow the DRY paradigm.

Comparison with other libraries

Feature dlopen2 libloading sharedlib
Basic functionality Yes Yes Yes
Multiplatform Yes Yes Yes
Dangling symbol prevention Yes Yes Yes
Thread safety Yes Potential problem with thread-safety of dlerror() on some platforms like FreeBSD No support for SetErrorMode (library may block the application on Windows)
Loading of symbols into structures Yes No No
Overhead Minimal Minimal Some overhead
Low-level, unsafe API Yes Yes Yes
Object-oriented friendly Yes No Yes
Load from the program itself Yes No No
Obtaining address information (dladdr) Yes Unix only No

Safety

Please note that while Rust aims at being 100% safe language, it does not yet provide mechanisms that would allow me to create a 100% safe library, so I had to settle on 99%. Also the nature of dynamic link libraries requires casting obtained pointers into types that are defined on the application side. And this cannot be safe. Having said that I still think that this library provides the best approach and greatest safety possible in Rust.

Usage

Cargo.toml:

[dependencies]
dlopen2 = "0.6"

Documentation

Cargo documentation

License

This code is licensed under the MIT license.

Changelog

GitHub changelog

Acknowledgement

Special thanks to Simonas Kazlauskas whose libloading became code base for my project.

MIT License Copyright (c) 2017 Szymon Wieloch Copyright (C) 2019 Ahmed Masud <ahmed.masud@saf.ai> Copyright (C) 2022 OpenByte <development.openbyte@gmail.com> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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MIT
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