IO#write multiple arguments

[carlhoerberg]

Cruby/jruby supports multiple arguments to IO#write, and is then using writev instead of write (for IO's who support writev, not all does, eg. openssl sockets). Truffleruby only supports a single argument.

File.open("/tmp/a", "w") do |f|
  f.write("foo", "bar", "\n")
end

<internal:core> core/io.rb:2378:in `write': wrong number of arguments (given 3, expected 1) (ArgumentError)
        from wv.rb:2:in `block in <main>'
        from <internal:core> core/io.rb:695:in `open'
        from wv.rb:1:in `<main>'

[eregon]

Thank you for the report, IO#write supports multiple arguments since Ruby 2.5 but it seems that was not yet implemented on TruffleRuby.

Given the Strings are typically in managed memory and need to be copied to native memory (at least on JVM, on SVM we could pin the byte[]), it's probably good enough to just add all strings together initially, copy them to native and do the write syscall.

@bjfish Could you implement it?

[bjfish]

This has been fixed at: 37c7070.