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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 CloudABI
extern crate cloudabi;
use std::io;
use rand_core::{Error, ErrorKind};
use super::OsRngImpl;
#[derive(Clone, Debug)]
pub struct OsRng;
impl OsRngImpl for OsRng {
fn new() -> Result<OsRng, Error> { Ok(OsRng) }
fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
let errno = unsafe { cloudabi::random_get(dest) };
if errno == cloudabi::errno::SUCCESS {
Ok(())
} else {
// Cloudlibc provides its own `strerror` implementation so we
// can use `from_raw_os_error` here.
Err(Error::with_cause(
ErrorKind::Unavailable,
"random_get() system call failed",
io::Error::from_raw_os_error(errno as i32),
))
}
}
fn method_str(&self) -> &'static str { "cloudabi::random_get" }
}
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