Hi all,

Recently I am trying out ffi, and I think it is great.
However, I am running into an alignment problem when passing values to
a struct:

--- ffi.c
#include <stdio.h>

typedef struct {
    int a;
    int b;
} Struct;

void test(char *ptr, int i, Struct s, int dummy)
{
    printf("%p %d [%d, %d] %d\n", ptr, i, s.a, s.b, dummy);
}
---

--- Makefile
libffi.so:      ffi.o
        gcc -g -shared -o libffi.so ffi.o
ffi.o:  ffi.c
        gcc -g -O2 -fPIC -o ffi.o -c ffi.c
---

--- ffi_test.rb
#!/usr/bin/ruby -w

require 'rubygems'
require 'ffi'

module TestFFI extend FFI::Library
    ffi_lib 'ffi'
    attach_function :test, [:pointer, :int, :int, :int], :void
end

ptr = FFI::MemoryPointer.new :float, 10
TestFFI.test(ptr, 10, 1, 2)
---

$ ./ffi_test.rb
0x20ed020 10 [1, 0] 2


I tried changing the latter two :ints into :int16 or :int64, but that
does not
make any difference.

I am running this on 64bit ubuntu 9.10.

$ ruby -v
    ruby 1.8.7 (2009-06-12 patchlevel 174) [x86_64-linux]
$ ruby1.9.1 -v
    ruby 1.9.1p243 (2009-07-16 revision 24175) [x86_64-linux]

Thanks,

Ronald