From: Mauricio Fernandez <mfp@...>
Date: 2005-12-16T10:45:35+09:00
Subject: [PATCH] Re: IO.open not calling close in block form?

On Fri, Dec 16, 2005 at 08:23:02AM +0900, Daniel Berger wrote:
> What happened to the block form of IO.open after 1.8.2?  It's supposed to 
> ensure 'close' is called, right?
> 
> class Foo < IO
>    def close
>       STDOUT.puts "Hello"
>       super
>    end
> end
> 
> if $0 == __FILE__
>    Foo.open(File.open("testio.txt","w+").fileno){ |fh|
>       fh.puts "hello"
>    }
> end

FWIW

batsman@tux-chan:/tmp$ cat io1.rb
File.open("testio.txt", "w") do |f|
  def f.close; $stdout.puts "CLOSE" end
end
batsman@tux-chan:/tmp$ ruby -v io1.rb
ruby 1.8.3 (2005-09-24) [i686-linux]
batsman@tux-chan:/tmp$

See [1].

What about this?


--- ruby1.8.orig/io.c   2005-12-16 02:26:26.000000000 +0100
+++ ruby1.8/io.c        2005-12-16 02:32:09.000000000 +0100
@@ -2146,17 +2146,6 @@
     return Qnil;
 }

-static VALUE
-io_close(io)
-    VALUE io;
-{
-    if (TYPE(io) == T_FILE) {
-       rb_io_close(io);
-       return Qnil;
-    }
-    return rb_funcall(io, rb_intern("close"), 0, 0);
-}
-
 /*
  *  call-seq:
  *     ios.closed?    => true or false
@@ -2186,6 +2175,16 @@
     return (fptr->f || fptr->f2)?Qfalse:Qtrue;
 }

+static VALUE
+io_close(io)
+    VALUE io;
+{
+    if (!RTEST(rb_io_closed(io)))
+       return rb_funcall(io, rb_intern("close"), 0, 0);
+
+    return Qnil;
+}
+
 /*
  *  call-seq:
  *     ios.close_read    => nil


$ ./ruby -ve 'open("/dev/null") {|f| def f.close; $stdout.puts "closed"; end; }'
ruby 1.8.4 (2005-11-02) [i686-linux]
closed
$ ./ruby -ve 'open("/dev/null") {|f| f.close; raise ArgumentError }'
ruby 1.8.4 (2005-11-02) [i686-linux]
-e:1: ArgumentError (ArgumentError)
        from -e:1
$ ./ruby -ve 'open("/dev/null") {|f| def f.close; $stdout.puts "closed"; end; raise ArgumentError }'
ruby 1.8.4 (2005-11-02) [i686-linux]
closed
-e:1: ArgumentError (ArgumentError)
        from -e:1


[1]
Tue Sep 20 00:34:07 2005  Yukihiro Matsumoto  <matz@ruby-lang.org>

        * io.c (io_close): call rb_io_close() directly if io is a T_FILE
          object.  [ruby-dev:27156]

-- 
Mauricio Fernandez