From 3ac7eb140480caea6f9ee8af6faa3e2a924b9b66 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 3 Jan 2005 02:46:26 +0000
Subject: * random.c (random_seed): use /dev/urandom if available.  
 [ruby-dev:25392]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@7714 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 random.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'random.c')

diff --git a/random.c b/random.c
index a317aa5cc1..e8fa78b944 100644
--- a/random.c
+++ b/random.c
@@ -144,6 +144,11 @@ genrand_real()
 #include <unistd.h>
 #endif
 #include <time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
 
 static int first = 1;
 
@@ -167,9 +172,22 @@ random_seed()
 {
     static int n = 0;
     struct timeval tv;
+    unsigned long result;
+    int fd;
+    unsigned long buf;
 
     gettimeofday(&tv, 0);
-    return tv.tv_sec ^ tv.tv_usec ^ getpid() ^ n++;
+    result = tv.tv_sec ^ tv.tv_usec ^ getpid() ^ n++;
+
+    result += (unsigned long)&result;
+
+    if ((fd = open("/dev/urandom", O_RDONLY)) >= 0) {
+        read(fd, &buf, sizeof(buf));
+        close(fd);
+        result ^= buf;
+    }
+
+    return result;
 }
 
 /*
-- 
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