merge revision(s) 51066: [Backport ruby#11319]

	* io.c (rb_io_oflags_modestr): handle O_TRUNC correctly

	* test/ruby/test_io.rb (test_reopen_stdio): new test
	  Patch-by: cremno phobia <[email protected]>
	  [ruby-core:69779] [Bug ruby#11319]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@51611 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: unak

ChangeLog

@@ -1,3 +1,10 @@
+Mon Aug 17 17:43:56 2015  Eric Wong  <[email protected]>
+
+	* io.c (rb_io_oflags_modestr): handle O_TRUNC correctly
+	* test/ruby/test_io.rb (test_reopen_stdio): new test
+	  Patch-by: cremno phobia <[email protected]>
+	  [ruby-core:69779] [Bug #11319]
+
 Mon Aug 17 17:42:18 2015  Benoit Daloze  <[email protected]>
 
 	* lib/net/ftp.rb (makeport): close the TCPServer

io.c

@@ -4958,6 +4958,9 @@ rb_io_oflags_modestr(int oflags)
       case O_WRONLY:
 	return MODE_BINARY("w", "wb");
       case O_RDWR:
+	if (oflags & O_TRUNC) {
+	    return MODE_BINARY("w+", "wb+");
+	}
 	return MODE_BINARY("r+", "rb+");
     }
 }

test/ruby/test_io.rb

@@ -1979,6 +1979,15 @@ def test_reopen_inherit
     }
   end
 
+  def test_reopen_stdio
+    mkcdtmpdir {
+      fname = 'bug11319'
+      File.write(fname, 'hello')
+      system(EnvUtil.rubybin, '-e', "STDOUT.reopen('#{fname}', 'w+')")
+      assert_equal('', File.read(fname))
+    }
+  end
+
   def test_reopen_mode
     feature7067 = '[ruby-core:47694]'
     make_tempfile {|t|

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.1.7"
 #define RUBY_RELEASE_DATE "2015-08-17"
-#define RUBY_PATCHLEVEL 393
+#define RUBY_PATCHLEVEL 394
 
 #define RUBY_RELEASE_YEAR 2015
 #define RUBY_RELEASE_MONTH 8