From a26a6e4656e2ed45be533a7a70c866647a8793d7 Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Wed, 4 Oct 2023 15:50:40 -0400
Subject: [PATCH] random: use get_random() instead of arc4random_buf() for
 non-bsd builds

---
 include/randomgen/random_seed.hpp | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/include/randomgen/random_seed.hpp b/include/randomgen/random_seed.hpp
index 5273ddeb..016f612f 100644
--- a/include/randomgen/random_seed.hpp
+++ b/include/randomgen/random_seed.hpp
@@ -1,9 +1,14 @@
 /* @file random_seed.hpp */
 
-#include "indentlog/print/array.hpp"
+//#include "indentlog/print/array.hpp"
 #include <iostream>
 #include <cstdint>
 #include <stdlib.h>
+#ifdef _BSD_SOURCE
+# include <bsd/stdlib.h>
+#else
+# include <sys/random.h>
+#endif
 
 namespace xo {
     namespace rng {
@@ -20,10 +25,22 @@ namespace xo {
          */
         template<typename T>
         void random_seed(T * p_seed) {
+#      ifdef _BSD_SOURCE
             /* NOTE: arc4random_buf() works on darwin/nix;
              *       probably need to do something else on intel linux
              */
-            arc4random_buf(p_seed, sizeof(*p_seed));
+            ::arc4random_buf(p_seed, sizeof(*p_seed));
+#      else
+            /* avail flags: GRND_RANDOM | GRND_NONBLOCK */
+            while (::getrandom(p_seed, sizeof(*p_seed), 0) == -1) {
+                if (errno == EINTR) {
+                    /* interrupted by signal,  try again */
+                    continue;
+                } else {
+                    break;
+                }
+            }
+#      endif
         } /*random_seed*/
 
         template<typename T>