Laurent,
I forward this e-mail to the squeak mailing list, may be someone there
have a better idea how the OSX VM works. BTW there are more
commentaries here
http://forum.world.st/squeak-dev-Alien-amp-Squeak-FFI-issues-on-Snow-Leopard-td85608.html
Cheers,

Hernán

2010/12/20 laurent laffont <laurent.laffont at gmail.com>:
> Hi Hernan,
> the strace equivalent on OSX seems to be dtruss (yes I'm learning OSX too :)
> sudo dtruss -p [pid of process]
> in the trace I have this:
> stat("/Users/laurentlaffont/Downloads/Seaside.app/Contents/Resources/yaz3.bundle/Contents/MacOS/yaz3\0",
> 0xBFF59440, 0xBFF5AB28) = -1 Err#2
> stat64("/Users/laurentlaffont/Downloads/Seaside.app/Contents/Resources/yaz3.bundle/Contents/MacOS/yaz3\0",
> 0xBFF5892C, 0xBFF5AB28) = -1 Err#2
> stat("/Users/laurentlaffont/Downloads/Seaside.app/Contents/Resources/yaz3\0",
> 0xBFF59440, 0xBFF5AB28) = 0 0
> stat64("/Users/laurentlaffont/Downloads/Seaside.app/Contents/Resources/yaz3\0",
> 0xBFF5892C, 0xBFF5AB28) = 0 0
> open("/Users/laurentlaffont/Downloads/Seaside.app/Contents/Resources/yaz3\0",
> 0x0, 0x0) = 12 0
> pread(0xC, "\317\372\355\376\a\0", 0x1000, 0x0) = 4096 0
> close(0xC) = 0 0
> stat("/Users/laurentlaffont/Downloads/Plugins/yaz3.bundle/Contents/MacOS/yaz3\0",
> 0xBFF59440, 0x1000) = -1 Err#2
> stat64("/Users/laurentlaffont/Downloads/Plugins/yaz3.bundle/Contents/MacOS/yaz3\0",
> 0xBFF5892C, 0x1000) = -1 Err#2
> stat("/Users/laurentlaffont/Downloads/Plugins/yaz3\0", 0xBFF59440, 0x1000) =
> -1 Err#2
> stat64("/Users/laurentlaffont/Downloads/Plugins/yaz3\0", 0xBFF5892C, 0x1000)
> = -1 Err#2
>
> so it looks like the VM is trying to find yaz3 at non standard Unix places
> (I don't know if it's SqueakVM or OSX related).
> I've created Contents/Resources/yaz3.bundle/Contents/MacOS/, put yaz lib
> there, ln -s libyaz.3.dylib yaz3 but no success.
>
> I've read good post http://forum.world.st/FFI-Documentation-td2225150.html :
>
> Module Location - where the external library file lives
> 	- depends on the platform
> 		- Mac
> 			- pre Snow Leopard
> 				- checks VM path and common library paths
> 			- Snow Leopard
> 				- only looks in VM bundle's Resources file, you must either [5]:
> 					- store all external libraries there
> 					- ln -s path/to/library path/to/VM/Resources/library_name
> 					- Change the VM's Info.plist "SqueakPluginsBuiltInOrLocalOnly" key from
> "true" to "false."								
>
> For this SqueakPluginsBuiltInOrLocalOnly I suppose I need to compile a VM ?
> Cheers,
> Laurent Laffont
>
>
> On Mon, Dec 20, 2010 at 4:12 PM, Hernán Morales Durand
> <hernan.morales at gmail.com> wrote:
>>
>> Hi Laurent
>>
>> I've read there is a couple of system calll monitors in MacOS, ktrace
>> and dtrace (http://en.wikipedia.org/wiki/Ktrace ,
>> http://en.wikipedia.org/wiki/DTrace) so you may attach to the VM and
>> see what's missing?
>> Cheers,
>>
>> Hernán
>>
>> 2010/12/20 laurent laffont <laurent.laffont at gmail.com>:
>> > Thanks Hernan.
>> > It still doesn't work. I've also tried to play with LD_LOAD_PATH /
>> > LD_LIBRARY_PATH no success.... I want to make it work so I need to learn
>> > :)
>> >
>> > For the mangled function names, on Linux and OSX there's nm.
>> > Here's what I get:
>> > $ nm -g libyaz.3.dylib | grep ZOOM_connection_create
>> > 0000000000046a30 T _ZOOM_connection_create
>> > Cheers,
>> > Laurent
>> >
>> > On Sun, Dec 19, 2010 at 6:23 PM, Hernán Morales Durand
>> > <hernan.morales at gmail.com> wrote:
>> >>
>> >> Hi Laurent,
>> >>
>> >> Thanks for reporting. The correct #moduleName for MacOS was missing,
>> >> I've uploaded a new version answering 'libyaz.3.dylib' which I guess
>> >> is the corresponding for 'yaz3.dll' (according to
>> >> http://en.wikipedia.org/wiki/Dynamic_library#Naming ).
>> >>
>> >> I haven't access to a MacOS, but in Windows I've had to find the
>> >> mangled function names (i.e. _ZOOM_connection_create at 4) so FFI can
>> >> find the function addresses and you don't get the classic "Error:
>> >> Unable to find function address". I don't know if it's related since
>> >> talks about C++, but you may want to check
>> >> http://wiki.squeak.org/squeak/3735
>> >>
>> >> The tool I've used to find the mangled function names in Windows is
>> >> the Steve Miller's Dependency Walker http://www.dependencywalker.com/
>> >>
>> >> 2010/12/19 laurent laffont <laurent.laffont at gmail.com>:
>> >> > Hi,
>> >> >
>> >> > I want to use http://www.squeaksource.com/Z3950
>> >> > Following install instructions, I've dowloaded yaz sources (I've
>> >> > tried
>> >> > 4.1.2
>> >> > and 3.0.52) as it seems there's no binary for OSX, ./configure
>> >> > && make
>> >> > &&
>> >> > make install.
>> >> > Then using latest Seaside One Click image I've copied
>> >> > /usr/local/lib/*yaz*
>> >> >  in Seaside.app/Contents/MacOS
>> >> > $ ls ~/Downloads/Seaside.app/Contents/MacOS/
>> >> > Squeak VM Opt         libyaz.a              libyaz.la
>> >> > libyaz_icu.a          libyaz_icu.la         libyaz_server.a
>> >> > libyaz_server.la libyaz.3.dylib        libyaz.dylib
>> >> >  libyaz_icu.3.dylib    libyaz_icu.dylib      libyaz_server.3.dylib
>> >> > libyaz_server.dylib
>> >> >
>> >> >
>> >> > But then I have a External Module Not Found on
>> >> > YAZPQFFFILibrary>>createParser
>> >> > " YAZPQDFFILibrary default createParser "
>> >> > <cdecl: YAZPQFParser 'yaz_pqf_create' (void) module: 'yaz3'>
>> >> > ^ self externalCallFailed
>> >> >
>> >> > Any hint ?
>> >> > Cheers,
>> >> > Laurent Laffont -- FFI newbie
>> >> >
>> >> > Pharo Smalltalk Screencasts: http://www.pharocasts.com/
>> >> > Blog: http://magaloma.blogspot.com/
>> >> >
>> >>
>> >> --
>> >> Hernán Morales
>> >> Information Technology Manager,
>> >> Institute of Veterinary Genetics.
>> >> National Scientific and Technical Research Council (CONICET).
>> >> La Plata (1900), Buenos Aires, Argentina.
>> >> Telephone: +54 (0221) 421-1799.
>> >> Internal: 422
>> >> Fax: 425-7980 or 421-1799.
>> >
>> >
>
>