From fc37921f59380c5ec66dd511d5fdf2274b1237d1 Mon Sep 17 00:00:00 2001
From: Sergey Kandaurov <pluknet@nginx.com>
Date: Mon, 16 Jul 2018 14:30:41 +0300
Subject: [PATCH] Added getentropy() support.

---
 nxt/auto/getrandom | 43 +++++++++++++++++++++++++++++++++++++++++++
 nxt/nxt_random.c   | 10 ++++++++++
 2 files changed, 53 insertions(+)

diff --git a/nxt/auto/getrandom b/nxt/auto/getrandom
index 09c52046..5e0e819e 100644
--- a/nxt/auto/getrandom
+++ b/nxt/auto/getrandom
@@ -46,3 +46,46 @@ if [ $nxt_found = no ]; then
                       }"
     . ${NXT_AUTO}feature
 fi
+
+
+if [ $nxt_found = no ]; then
+
+    # OpenBSD 5.6 lacks <sys/random.h>.
+
+    nxt_feature="getentropy()"
+    nxt_feature_name=NXT_HAVE_GETENTROPY
+    nxt_feature_test="#include <unistd.h>
+
+                      int main(void) {
+                          char  buf[4];
+
+                          if (getentropy(buf, 4) == -1) {
+                              return 1;
+                          }
+
+                          return 0;
+                      }"
+    . ${NXT_AUTO}feature
+fi
+
+
+if [ $nxt_found = no ]; then
+
+    # macOS 10.12.
+
+    nxt_feature="getentropy() in sys/random.h"
+    nxt_feature_name=NXT_HAVE_GETENTROPY_SYS_RANDOM
+    nxt_feature_test="#include <unistd.h>
+                      #include <sys/random.h>
+
+                      int main(void) {
+                          char  buf[4];
+
+                          if (getentropy(buf, 4) == -1) {
+                              return 1;
+                          }
+
+                          return 0;
+                      }"
+    . ${NXT_AUTO}feature
+fi
diff --git a/nxt/nxt_random.c b/nxt/nxt_random.c
index f99dee08..9e4b8654 100644
--- a/nxt/nxt_random.c
+++ b/nxt/nxt_random.c
@@ -17,6 +17,8 @@
 #elif (NXT_HAVE_LINUX_SYS_GETRANDOM)
 #include <sys/syscall.h>
 #include <linux/random.h>
+#elif (NXT_HAVE_GETENTROPY_SYS_RANDOM)
+#include <sys/random.h>
 #endif
 
 
@@ -76,6 +78,14 @@ nxt_random_stir(nxt_random_t *r, nxt_pid_t pid)
 
     n = syscall(SYS_getrandom, &key, NXT_RANDOM_KEY_SIZE, 0);
 
+#elif (NXT_HAVE_GETENTROPY || NXT_HAVE_GETENTROPY_SYS_RANDOM)
+
+    n = 0;
+
+    if (getentropy(&key, NXT_RANDOM_KEY_SIZE) == 0) {
+        n = NXT_RANDOM_KEY_SIZE;
+    }
+
 #else
 
     n = 0;
-- 
2.47.3