[FFI] GetLastError always returns 0 on Windows
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Key: JRUBY-4388
URL: http://jira.codehaus.org/browse/JRUBY-4388
Project: JRuby
Issue Type: Bug
Components: Extensions, Windows
Affects Versions: JRuby 1.4
Reporter: Vladimir Sizikov
I've noticed that when tweaking jnr-posix on Windows, no matter what I do,
GetLastError() or errno() always return 0.
So I tried to reproduce the same with standalnoe FFI, and the same problem with
FFI on JRuby. (Works fine with ruby-fii on MRI though!).
Here's the example:
{code}
require 'ffi'
module MyFFI
FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000
FORMAT_MESSAGE_FROM_HMODULE = 0x00000800
extend FFI::Library
ffi_lib 'msvcrt', 'kernel32'
ffi_convention :stdcall
attach_function :GetFileType, [:int], :int
attach_function :GetLastError, [], :int
attach_function :FormatMessageA, [:int, :pointer, :int, :int, :string, :int,
:pointer], :int
end
MyFFI.GetFileType(-100)
errno = MyFFI.GetLastError
p "GetLastError: #{errno} (should be 6)"
msg = " " * 1024
p len = MyFFI.FormatMessageA(MyFFI::FORMAT_MESSAGE_FROM_SYSTEM, nil, errno, 0,
msg, 1024, nil)
p msg[0..len-3] # remove \r\n\000
{code}
MRI prints:
{noformat}
D:\work\jruby-dev\jruby>ruby -rubygems link-ffi.rb
"GetLastError: 6 (should be 6)"
24
"The handle is invalid."
{noformat}
JRuby prints:
{code}
D:\work\jruby-dev\jruby>jruby -rubygems link-ffi.rb
"GetLastError: 0 (should be 6)"
39
" "
{code}
Note the last error under JRuby is 0.
The second problem with JRuby's FFI is that the error message is empty (albeit
of correct size for errno 0).
So, both, GetLastError() and FormatMessage() are not working right.
Any hints would be appreciated!
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