[Shards-general] FFI version of io-extra

[Eric Wong]

Daniel Berger <djberg96 at gmail.com> wrote:
> Hi folks,
> 
> Just for kicks, and to see what would happen with JRuby, I've created
> an ffi branch for io-extra. It's mostly done, though I have a few test
> failures (currently commented out) that I'm hoping to resolve.

  F_GETFD      = 1        # Get file descriptor flags
  F_GETFL      = 3        # Get file flags
  F_SETFL      = 4        # Set file flags

You should be able to get the F_* constants from the standard fcntl
extension (no idea if JRuby supports that ext) though.


  O_DIRECT     = 00040000 # Direct disk access hint

Ruby 1.9.3 defines IO::DIRECT already.


  # Used by the writev method.
  class Iovec < FFI::Struct
    layout(:iov_base, :pointer, :iov_len, :int)

I'm not familiar with FFI, but :iov_len being :int doesn't look right.
iov_len should be size_t (8 bytes on 64-bit), int is only 4 bytes.


Given all the issues of FFI (many of which you've written about :), I
don't think it's worth the effort.  I've never been interested in
supporting JRuby/JVM, though.