From 174378d4c6a712f57bf900a377714fef39afb51e Mon Sep 17 00:00:00 2001
From: Ed Schouten <ed@nuxi.nl>
Date: Mon, 31 Aug 2015 15:06:21 +0200
Subject: [PATCH] Port to CloudABI.

CloudABI does not provide access to the global filesystem namespace. We
can simply call into arc4random_buf() to get high-quality random data.
---
 src/random_device.cpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/random_device.cpp b/src/random_device.cpp
index e80c9fa01e..6e2ba1a091 100644
--- a/src/random_device.cpp
+++ b/src/random_device.cpp
@@ -147,6 +147,29 @@ class boost::random::random_device::impl
   const std::string provider;
 };
 
+#elif defined(__CloudABI__)
+
+#include <stdlib.h>
+
+namespace {
+const char * const default_token = "";
+}
+
+// CloudABI does not provide access to the global filesystem namespace.
+// The only way to obtain random data is by calling arcrandom_buf().
+class boost::random::random_device::impl
+{
+public:
+  impl(const std::string & token) {}
+  ~impl() {}
+
+  unsigned int next() {
+    unsigned int result;
+    arc4random_buf(&result, sizeof(result));
+    return result;
+  }
+};
+
 #else
 
 namespace {