getrandom 0.1.9

A small cross-platform library for retrieving random data from system source
Documentation 
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// 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.

//! Implementation for WASI
use crate::Error;
use core::num::NonZeroU32;
use wasi::wasi_unstable::random_get;

pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
    let ret = random_get(dest);
    if let Some(code) = NonZeroU32::new(ret as u32) {
        error!("WASI: random_get failed with return value {}", code);
        Err(Error::from(code))
    } else {
        Ok(()) // Zero means success for WASI
    }
}