Bug #17934: clipboard gem fail on Ruby 3.0.1

• Status: Third Party's Issue
• Assignee: -
• Target version: -
• ruby -v: ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x64-mingw32]
• Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN

[fitmap (Justin Peal)]

gem install clipboard (Which was used well in Ruby 2.XX):
Fetching clipboard-1.3.5.gem
Successfully installed clipboard-1.3.5
Parsing documentation for clipboard-1.3.5
Installing ri documentation for clipboard-1.3.5
Done installing documentation for clipboard after 0 seconds
1 gem installed

content of D:/R/hike/test.rb:

frozen_string_literal: true

require 'clipboard'
Clipboard.copy('content')

After run test.rb:
D:/Ruby/lib/ruby/gems/3.0.0/gems/clipboard-1.3.5/lib/clipboard/windows.rb:76:in put_bytes': invalid memory write at address=0x0000000000000000 (FFI::NullPointerError) from D:/Ruby/lib/ruby/gems/3.0.0/gems/clipboard-1.3.5/lib/clipboard/windows.rb:76:in copy'
from D:/Ruby/lib/ruby/gems/3.0.0/gems/clipboard-1.3.5/lib/clipboard.rb:62:in copy' from D:/R/hike/test.rb:3:in '

[xtkoba (Tee KOBAYASHI)]

Feel free to report it to https://github.com/ffi/ffi/issues. (BTW it is reproducible for me.)

[Eregon (Benoit Daloze)]

More likely to be an issue of https://github.com/janlelis/clipboard
The error means the clipboard gem tries to write to the NULL address, which is a bug.

[xtkoba (Tee KOBAYASHI)]

Indeed.

And this seems to be another instance of LLP64 issues which wrongfully assume sizeof(long) == sizeof(void *). Running on i386-mingw32 works as expected.

(Edited. LLP64, not ILP32.)

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Third Party's Issue

[fitmap (Justin Peal)]

• File clipboard.Rb clipboard.Rb added
• File ClipboardTest.rb ClipboardTest.rb added

In Windows x64, SIZE_T and HGLOBAL (and other handles) in Fiddle shoule be map to void*(64 bits), not uint(32 bits).
So gem clipboard V1.3.5 got a pointor failure.
Attachment fix this bug, just for Windows platform.