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Diffstat (limited to 'dom/webauthn/libudev-sys/Cargo.toml')
| -rw-r--r-- | dom/webauthn/libudev-sys/Cargo.toml | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/dom/webauthn/libudev-sys/Cargo.toml b/dom/webauthn/libudev-sys/Cargo.toml new file mode 100644 index 0000000000..6ad8028c61 --- /dev/null +++ b/dom/webauthn/libudev-sys/Cargo.toml @@ -0,0 +1,37 @@ +# 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" + +[dependencies] +lazy_static = "1.0" +libc = "0.2" |