From cddef0c0be1c30f45ea525af7a42b54d1a78786c Mon Sep 17 00:00:00 2001
From: Don Viszneki <don@codebad.com>
Date: Mon, 5 Mar 2018 18:43:31 -0800
Subject: [PATCH] tests: add warning message when /dev/urandom fails

in case this code should ever be used as an example, a warning is a nice
way of helping ensure insecure keys are not generated
---
 src/tests.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/tests.c b/src/tests.c
index 893d29722c0e2..05314572c0f91 100644
--- a/src/tests.c
+++ b/src/tests.c
@@ -4919,6 +4919,7 @@ int main(int argc, char **argv) {
     } else {
         FILE *frand = fopen("/dev/urandom", "r");
         if ((frand == NULL) || fread(&seed16, sizeof(seed16), 1, frand) != sizeof(seed16)) {
+            fprintf(stderr, "WARNING: could not read 16 bytes from /dev/urandom; falling back to insecure PRNG\n");
             uint64_t t = time(NULL) * (uint64_t)1337;
             seed16[0] ^= t;
             seed16[1] ^= t >> 8;