From 367c27cb023e84226c2b54ef5f594997f8e4d70a Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 18 Mar 2021 09:00:38 -0600
Subject: compat: backport to FreeBSD 12.1

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 src/compat.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/compat.h b/src/compat.h
index 649e7dc..6126e26 100644
--- a/src/compat.h
+++ b/src/compat.h
@@ -67,5 +67,22 @@ static inline void taskqgroup_drain_all(struct taskqgroup *tqg)
 		gtaskqueue_drain_all(q);
 	}
 }
+#endif
+
+#if __FreeBSD_version < 1202000
+static inline uint32_t arc4random_uniform(uint32_t bound)
+{
+	uint32_t ret, max_mod_bound;
+
+	if (bound < 2)
+		return 0;
 
+	max_mod_bound = (1 + ~bound) % bound;
+
+	do {
+		ret = arc4random();
+	} while (ret < max_mod_bound);
+
+	return ret % bound;
+}
 #endif
-- 
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