From: Charles Oliver Nutter <headius@...>
Date: 2009-08-02T17:32:27+09:00
Subject: Re: JRuby, ffi, bad file descriptor

Hmm, did you post this to JRuby dev list or ruby-ffi list yet? Could
be something simple...

You might also try getting a raw Java backtrace by passing this flag to JRuby:

-J-Djruby.backtrace.style=raw

That will show us if it's happening in JRuby's IO code or in FFI somewhere.

- Charlie

On Fri, Jul 31, 2009 at 9:54 PM, Daniel Berger<djberg96@gmail.com> wrote:
> Hi,
>
> JRuby 1.3.1
> OS X 10.4.9
>
> The following code is a port of a tempfile library I wrote. Ruby 1.8.6 and
> 1.9.x work alright, but with JRuby I'm getting a bad file descriptor error.
>
> Any ideas? Here's the code:
>
> require 'ffi'
>
> class FileTemp < File
>   extend FFI::Library
>
>   attach_function 'fileno',  [:pointer], :int
>   attach_function 'fclose',  [:pointer], :int
>   attach_function 'mkstemp', [:string],  :int
>   attach_function 'tmpfile', [],         :pointer
>   attach_function 'tmpnam',  [:string],  :string
>   attach_function 'umask',   [:int],     :int
>
>   TMPDIR = ENV['TEMP'] || ENV['TMP'] || '/tmp'
>
>   def initialize(delete = true, template = 'rb_file_temp_XXXXXX')
>      @fptr = nil
>
>      if delete
>         @fptr = tmpfile()
>         fd = fileno(@fptr)
>      else
>         begin
>            omask = umask(077)
>            fd = mkstemp(template)
>            raise SystemCallError, 'mkstemp()' if fd < 0
>         ensure
>            umask(omask)
>         end
>      end
>
>      super(fd, 'wb+')
>   end
>
>   def close
>      super
>      fclose(@fptr) if @fptr
>   end
>
>   def self.temp_name
>      TMPDIR + tmpnam(nil) << '.tmp'
>   end
> end
>
> if $0 == __FILE__
>   fh = FileTemp.new
>   fh.print 'hello'
>   fh.close
> end
>
> Result:
>
> temp.rb:42:in `initialize': Bad file descriptor - Bad file descriptor
> (Errno::EBADF)
>        from temp.rb:56:in `new'
>        from temp.rb:56
>
> Regards,
>
> Dan
>
>