# This is a fork of libudev-sys that dynamically loads its symbols with
# dlopen when they are first used. This continues a precedent established
# by Firefox's gamepad APIs to minimize the footprint of features when they
# aren't being used. Specifically, this avoids the cost of dynamically linking
# in libudev at process startup.
#
# "-sys" crates are a convention in the rust ecosystem for "a simple header
# for a C library that Rust code can use to build a richer and safer API on
# top of". In this case, libudev-sys is used by the [libudev crate].
#
# As of this writing, this hack is being used by the [authenticator-rs] crate,
# which uses the libudev crate.
#
# The libudev crate assumes libudev is being dynamically linked in, and
# checks if its symbols are null before intializing anything else, so that
# you can use it to detect if libudev is installed and gracefully
# disable gamepads or whatever else if it's not.
#
# If we're missing any symbols the libudev crate needs, then rust will give
# us a compilation error. It's not a problem if we export additional symbols.
#
# So while this is a bit of a weird hack, it works pretty robustly, and this
# crate is basically just a header for libudev so it's not a particularly
# significant maintenance burden.
#
# authenticator-rs: https://github.com/mozilla/authenticator-rs
# libudev crate: https://crates.io/crates/libudev

[package]
name = "libudev-sys"
version = "0.1.3"
authors = ["Tim Taubert <ttaubert@mozilla.com>"]
description = "FFI bindings to libudev"
license = "MPL-2.0"

[dependencies]
lazy_static = "1.0"
libc = "0.2"