[njs] Added getentropy() support.

[Sergey Kandaurov]

details:   http://hg.nginx.org/njs/rev/04dc301f7d5a
branches:  
changeset: 558:04dc301f7d5a
user:      Sergey Kandaurov <pluknet at nginx.com>
date:      Mon Jul 16 14:30:41 2018 +0300
description:
Added getentropy() support.

diffstat:

 nxt/auto/getrandom |  43 +++++++++++++++++++++++++++++++++++++++++++
 nxt/nxt_random.c   |  10 ++++++++++
 2 files changed, 53 insertions(+), 0 deletions(-)

diffs (77 lines):

diff -r e9d93bfd7714 -r 04dc301f7d5a nxt/auto/getrandom
--- a/nxt/auto/getrandom	Mon Jul 16 14:21:09 2018 +0300
+++ b/nxt/auto/getrandom	Mon Jul 16 14:30:41 2018 +0300
@@ -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 -r e9d93bfd7714 -r 04dc301f7d5a nxt/nxt_random.c
--- a/nxt/nxt_random.c	Mon Jul 16 14:21:09 2018 +0300
+++ b/nxt/nxt_random.c	Mon Jul 16 14:30:41 2018 +0300
@@ -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
 
     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;