From 99d0eda9cab0ee07166dc856ad31cac7ef30eb7d Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Fri, 8 Jun 2018 03:18:28 +0200
Subject: tools: support getentropy(3)

---
 src/tools/genkey.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/tools/genkey.c b/src/tools/genkey.c
index 5971528..04de2ba 100644
--- a/src/tools/genkey.c
+++ b/src/tools/genkey.c
@@ -13,6 +13,9 @@
 #ifdef __linux__
 #include <sys/syscall.h>
 #endif
+#ifdef __APPLE__
+#include <sys/random.h>
+#endif
 
 #include "curve25519.h"
 #include "encoding.h"
@@ -22,11 +25,19 @@ static inline ssize_t get_random_bytes(uint8_t *out, size_t len)
 {
 	ssize_t ret;
 	int fd;
+
+#if defined(__OpenBSD__) || defined(__APPLE__) || (defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25)))
+	ret = getentropy(out, len);
+	if (!ret)
+		return len;
+#endif
+
 #if defined(__NR_getrandom) && defined(__linux__)
 	ret = syscall(__NR_getrandom, out, len, 0);
 	if (ret >= 0)
 		return ret;
 #endif
+
 	fd = open("/dev/urandom", O_RDONLY);
 	if (fd < 0)
 		return fd;
-- 
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