A libffi wrapper for Ruby.
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nobu and hsbt test_function.rb: fix messages
* test/fiddle/test_function.rb (test_nogvl_poll): fix messages as
  failed conditions, with errno description.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64091 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Latest commit c820d59 Jul 28, 2018



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A libffi wrapper for Ruby.

Fiddle is an extension to translate a foreign function interface (FFI) with ruby.

It wraps libffi, a popular C library which provides a portable interface that allows code written in one language to call code written in another language.


Add this line to your application's Gemfile:

gem 'fiddle'

And then execute:

$ bundle

Or install it yourself as:

$ gem install fiddle


Here we will use Fiddle::Function to wrap floor(3) from libm

require 'fiddle'

libm = Fiddle.dlopen('/lib/libm.so.6')

floor = Fiddle::Function.new(

puts floor.call(3.14159) #=> 3.0


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.


Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/fiddle.


The gem is available as open source under the terms of the BSD-2-Clause.