Add Custom RNG: getrandom-dummy

Author: josephlr

Cargo.toml

@@ -16,6 +16,7 @@ appveyor = { repository = "rust-random/getrandom" }
 
 [workspace]
 members = [
+    "custom/dummy",
 ]
 
 [dependencies]

custom/dummy/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "getrandom-dummy"
+version = "0.1.0"
+edition = "2018"
+authors = ["The Rand Project Developers"]
+license = "MIT OR Apache-2.0"
+description = "Dummy implementation for using getrandom on all unsupported targets"
+documentation = "https://docs.rs/getrandom-dummy"
+repository = "https://github.com/rust-random/getrandom/tree/master/custom/dummy"
+
+[lib]
+crate-type = ["dylib"]
+
+[dependencies]
+getrandom = { path = "../..", features = ["custom"] }

custom/dummy/src/lib.rs

@@ -0,0 +1,16 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! `getrandom` dummy implementation for all unsupported targets
+use getrandom::{register_custom_getrandom, Error};
+
+register_custom_getrandom!(getrandom_inner);
+
+fn getrandom_inner(_dest: &mut [u8]) -> Result<(), Error> {
+    Err(Error::UNSUPPORTED)
+}