From: Daniel Berger <djberg96@...>
Date: 2009-08-03T21:21:01+09:00
Subject: Re: JRuby, ffi, bad file descriptor

On Aug 2, 10:34 pm, Charles Oliver Nutter <head...@headius.com> wrote:
> Got the source of that temp.rb handy? It looks like it's passing a
> bad/closed descriptor to IO.new or something...

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