From 74ad31536051e68b4b9edf924662b34c30b09da7 Mon Sep 17 00:00:00 2001
From: nia <nia@netbsd.org>
Date: Fri, 1 May 2020 17:23:27 +0100
Subject: [PATCH] In init_rand avoid reading from /dev/urandom on
 NetBSD/FreeBSD

Use the KERN_ARND sysctl instead.
---
 src/os.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/os.cpp b/src/os.cpp
index 16d6847d4e..26ed0dc4e1 100644
--- a/src/os.cpp
+++ b/src/os.cpp
@@ -1462,6 +1462,14 @@ static void init_rand() {
     unsigned seed;
     memcpy(&seed, ptr_random, sizeof(seed));
     srand(seed);
+#elif defined(ZIG_OS_FREEBSD) || defined(ZIG_OS_NETBSD)
+    unsigned seed;
+    size_t len = sizeof(seed);
+    int mib[2] = { CTL_KERN, KERN_ARND };
+    if (sysctl(mib, 2, &seed, &len, NULL, 0) != 0) {
+        zig_panic("unable to query random data from sysctl");
+    }
+    srand(seed);
 #else
     int fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC);
     if (fd == -1) {