1 files changed, 54 insertions, 0 deletions
diff --git a/rand/rand_os/src/netbsd.rs b/rand/rand_os/src/netbsd.rs
new file mode 100644
index 0000000..cf4b6c7
--- /dev/null
+++ b/rand/rand_os/src/netbsd.rs
@@ -0,0 +1,54 @@
+// 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 NetBSD
+
+use rand_core::Error;
+use super::random_device;
+use super::OsRngImpl;
+
+use std::fs::File;
+use std::io::Read;
+use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
+
+#[derive(Clone, Debug)]
+pub struct OsRng { initialized: bool }
+
+impl OsRngImpl for OsRng {
+    fn new() -> Result<OsRng, Error> {
+        random_device::open("/dev/urandom", &|p| File::open(p))?;
+        Ok(OsRng { initialized: false })
+    }
+
+    fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+        random_device::read(dest)
+    }
+
+    // Read a single byte from `/dev/random` to determine if the OS RNG is
+    // already seeded. NetBSD always blocks if not yet ready.
+    fn test_initialized(&mut self, dest: &mut [u8], _blocking: bool)
+        -> Result<usize, Error>
+    {
+        static OS_RNG_INITIALIZED: AtomicBool = ATOMIC_BOOL_INIT;
+        if !self.initialized {
+            self.initialized = OS_RNG_INITIALIZED.load(Ordering::Relaxed);
+        }
+        if self.initialized { return Ok(0); }
+
+        info!("OsRng: testing random device /dev/random");
+        let mut file =
+            File::open("/dev/random").map_err(random_device::map_err)?;
+        file.read(&mut dest[..1]).map_err(random_device::map_err)?;
+
+        OS_RNG_INITIALIZED.store(true, Ordering::Relaxed);
+        self.initialized = true;
+        Ok(1)
+    }
+
+    fn method_str(&self) -> &'static str { "/dev/urandom" }
+}