io.c: no error on frozen IO

* io.c (rb_io_fileno, rb_io_inspect): non-modification does not
  error on frozen IO.  [ruby-dev:48241] [Bug #9865]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46151 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 18 insertions, 3 deletions

diff --git a/ChangeLog b/ChangeLog
index 1bafb70ef8..39230dd9b3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue May 27 11:12:56 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* io.c (rb_io_fileno, rb_io_inspect): non-modification does not
+	  error on frozen IO.  [ruby-dev:48241] [Bug #9865]
+
 Tue May 27 00:00:21 2014  yui-knk  <spiketeika@gmail.com>
 
 	* insns.def (defineclass): fix typo in the instruction comment.
diff --git a/io.c b/io.c
index 18a0e2cb2e..61a77d7a25 100644
--- a/io.c
+++ b/io.c
@@ -1996,10 +1996,10 @@ rb_io_fdatasync(VALUE io)
 static VALUE
 rb_io_fileno(VALUE io)
 {
-    rb_io_t *fptr;
+    rb_io_t *fptr = RFILE(io)->fptr;
     int fd;
 
-    GetOpenFile(io, fptr);
+    rb_io_check_closed(fptr);
     fd = fptr->fd;
     return INT2FIX(fd);
 }
@@ -2051,7 +2051,7 @@ rb_io_inspect(VALUE obj)
     VALUE result;
     static const char closed[] = " (closed)";
 
-    fptr = RFILE(rb_io_taint_check(obj))->fptr;
+    fptr = RFILE(obj)->fptr;
     if (!fptr) return rb_any_to_s(obj);
     result = rb_str_new_cstr("#<");
     rb_str_append(result, rb_class_name(CLASS_OF(obj)));
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 79a4bb4599..0d5671a267 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -1122,6 +1122,8 @@ class TestIO < Test::Unit::TestCase
   def test_inspect
     with_pipe do |r, w|
       assert_match(/^#<IO:fd \d+>$/, r.inspect)
+      r.freeze
+      assert_match(/^#<IO:fd \d+>$/, r.inspect)
     end
   end
 
@@ -2786,6 +2788,14 @@ End
     assert_equal(2, $stderr.fileno)
   end
 
+  def test_frozen_fileno
+    bug9865 = '[ruby-dev:48241] [Bug #9865]'
+    with_pipe do |r,w|
+      fd = r.fileno
+      assert_equal(fd, r.freeze.fileno, bug9865)
+    end
+  end
+
   def test_sysread_locktmp
     bug6099 = '[ruby-dev:45297]'
     buf = " " * 100