1 files changed, 39 insertions, 0 deletions
diff --git a/rand/rand_os/src/cloudabi.rs b/rand/rand_os/src/cloudabi.rs
new file mode 100644
index 0000000..8b96a2b
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+++ b/rand/rand_os/src/cloudabi.rs
@@ -0,0 +1,39 @@
+// 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" }
+}