merges r32050 from trunk into ruby_1_9_2.

--
* lib/securerandom.rb (SecureRandom.random_bytes): modify PRNG state
  to prevent random number sequence repeatation at forked child
  process which has same pid.
  reported by Eric Wong.  [ruby-core:35765]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@32381 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Mon Jun 13 18:33:04 2011  Tanaka Akira  <akr@fsij.org>
+
+	* lib/securerandom.rb (SecureRandom.random_bytes): modify PRNG state
+	  to prevent random number sequence repeatation at forked child
+	  process which has same pid.
+	  reported by Eric Wong.  [ruby-core:35765]
+
 Sat Jun 11 18:02:09 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* io.c (io_getc): should be 7bit if ascii.  fixes #4557

lib/securerandom.rb

@@ -57,6 +57,14 @@ module SecureRandom
     n ||= 16
 
     if defined? OpenSSL::Random
+      @pid = $$ if !defined?(@pid)
+      pid = $$
+      if @pid != pid
+        now = Time.now
+        ary = [now.to_i, now.nsec, @pid, pid]
+        OpenSSL::Random.seed(ary.to_s)
+        @pid = pid
+      end
       return OpenSSL::Random.random_bytes(n)
     end
 

version.h

@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.2"
-#define RUBY_PATCHLEVEL 280
+#define RUBY_PATCHLEVEL 281
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 1