Nick,

Partial success. After a false start with getting output from strace (my fault), it showed me that the vm was looking a lot in the vm's directory. A symlink by the same name, allowed it to see the library. Clearly, this is not a fix, because one should not be forced to make links to any/every library on the system. However, it *was* nice to see the version string in an inspector :)

Looking at the strace output (relevant parts below), it tries with prepending lib, appending .so, .so.dylib. It looks in the vm's directory, and in the root directory, not /usr/lib.

It has been almost a year (based on a dated comment) since I last really strained my synapses on the workings of ldconfig. On my systems, it would tell one to look for the library as follows:

ldconfig -p | grep Acces
libAccesIO-USB.so (libc6) => /usr/lib/libAccesIO-USB.so

#moduleName answers 'libAccesIO-USB.so', and Ian's vm finds it. My (and I use the term LOOSELY) understanding is that Ubuntu no longer uses LD_LIBRARY_PATH. dlopen() seems to prefer that one use the names as reported by ldconfig. The best explanation I have found is that the change was a security measure.

How does one get ldconfig to "know" where something lives? Putting a .so file in /usr/lib (and perhaps other places too) and then running ldconfig as sudo appears to build a cache. Then ldconfig -p (anyone can run this) will show the map, and one can grep the result to find something specifc, as above.

Putting files in /usr/lib is a pain for things under active development. A file can live anywhere if one puts a .conf file in /etc/ld.so.confd; the .conf files should contain paths to directories to be searched for .so files - or at least that's how it *appears* to work. Run ldconfig as sudo to refresh the mapping, and verify with ldconfig - p.

The fix might be as simply as having the cog vm try passing the #moduleName to dlopen().

Nick, thanks for the nudge in a working direction. I will probably symlink another file and see if a mix of hardware and software will get closer to cooperating with me.

Bill

stat64("/home/bills/Work2010/Pharo-1.1.1/libAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/libAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/libAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/liblibAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/liblibAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/liblibAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("./libAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("./libAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("./libAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("./liblibAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("./liblibAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("./liblibAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("libAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("libAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("libAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("liblibAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("liblibAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("liblibAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/libAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/libAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/libAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/liblibAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/liblibAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/liblibAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/libAccesIO-USB.so/.libs/libAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/libAccesIO-USB.so/.libs/libAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/libAccesIO-USB.so/.libs/libAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/libAccesIO-USB.so/.libs/liblibAccesIO-USB.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/libAccesIO-USB.so/.libs/liblibAccesIO-USB.so.so", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
stat64("/home/bills/Work2010/Pharo-1.1.1/libAccesIO-USB.so/.libs/liblibAccesIO-USB.so.dylib", 0xbfd66c5c) = -1 ENOENT (No such file or directory)
read(10, ">externalCallFailed\nAccesIOUSBLi"..., 3424) = 3424
read(10, ">externalCallFailed\nAccesIOUSBLi"..., 4096) = 3424
write(10, "FileAccess: ", 12)           = 12
write(10, "SocketAccess: ", 14)         = 14
write(10, "an AccesIOUSBLibrary", 20)   = 20
write(10, "'libAccesIO-USB.so'", 19)    = 19
write(10, "an AccesIOUSBLibrary", 20)   = 20
write(10, "'libAccesIO-USB.so'", 19)    = 19
write(10, "an AccesIOUSBLibrary", 20)   = 20
write(10, "'libAccesIO-USB.so'", 19)    = 19
write(10, "an AccesIOUSBLibrary", 20)   = 20
write(10, "'libAccesIO-USB.so'", 19)    = 19
write(10, "#'Hardware-AccesIO'", 19)    = 19
write(10, "\t\ttextOrStream: \t'\t^AccesIOUSBLi"..., 65) = 65
write(10, "\t^ AccesIOUSBLibrary default AIO"..., 46) = 46
write(10, "a ReadStream '\t^AccesIOUSBLibrar"..., 61) = 61
write(10, "\t^AccesIOUSBLibrar...etc...", 27) = 27
write(10, "\t^AccesIOUSBLibrar...etc...", 27) = 27
write(10, "\t^AccesIOUSBLibrary defau...etc."..., 34) = 34

From: pharo-project-bounces@lists.gforge.inria.fr [pharo-project-bounces@lists.gforge.inria.fr] on behalf of Schwab,Wilhelm K [bschwab@anest.ufl.edu]
Sent: Saturday, January 07, 2012 8:55 AM
To: Pharo-project@lists.gforge.inria.fr
Subject: Re: [Pharo-project] Cog+linux: external module not found

It would also be nice to see (either via syslog()/OutputDebugString()) or (if possible) in the error itself, what library (full path) was being loaded. The output will generally be of interest only when something fails.

Similar comments would apply to serial ports that won't open - what did the vm actually try to do when something failed? Most problems that I have had with getting Pharo to open something (library or port) have been relatively obvious to solve as soon as I saw how my intent was translated before it was passed on to the hardware (e.g. /usr/lib//this/that/something.so).

Bill

From: pharo-project-bounces@lists.gforge.inria.fr [pharo-project-bounces@lists.gforge.inria.fr] on behalf of Mariano Martinez Peck [marianopeck@gmail.com]
Sent: Saturday, January 07, 2012 5:20 AM
To: Pharo-project@lists.gforge.inria.fr
Subject: Re: [Pharo-project] Cog+linux: external module not found

BTW, Eliot, is there a way so that FFI throws something different from "Module not found" when the module is there but not 32 bits? like "Module found but it is not 32 bits" ?
cheers

On Sat, Jan 7, 2012 at 10:04 AM, Nick Ager <nick.ager@gmail.com> wrote:

Hi Bill,

Have you tried strace to determine what library it's failing to load?

Nick

On 7 January 2012 03:26, Schwab,Wilhelm K <bschwab@anest.ufl.edu> wrote:

Eliot,

There is no /lib32 or /usr/lib32. As a double check,

locate lib32

returns nothing. I put the library in /usr/lib, which is what I have done on two other Lucid systems. ldconfig shows it registered there.

What's next?

Bill

From: pharo-project-bounces@lists.gforge.inria.fr [pharo-project-bounces@lists.gforge.inria.fr] on behalf of Eliot Miranda [eliot.miranda@gmail.com]
Sent: Friday, January 06, 2012 7:29 PM

To: Pharo-project@lists.gforge.inria.fr
Subject: Re: [Pharo-project] Cog+linux: external module not found

On Fri, Jan 6, 2012 at 4:18 PM, Schwab,Wilhelm K <bschwab@anest.ufl.edu> wrote:

Paul,

The library is 32 bit - I build it from source because it ships with 64 bit binaries.

Then try changing your LD_LIBRARY_PATH to /lib32:/usr/lib32:$LD_LIBRARY_PATH and see if that helps (if you have /lib32 & /usr/lib32 that is)

Bill

________________________________________
From: pharo-project-bounces@lists.gforge.inria.fr [pharo-project-bounces@lists.gforge.inria.fr] on behalf of Paul DeBruicker [pdebruic@gmail.com]
Sent: Friday, January 06, 2012 6:59 PM
To: pharo-project@lists.gforge.inria.fr

Subject: Re: [Pharo-project] Cog+linux: external module not found

Schwab,Wilhelm K wrote
>
> Eliot,
>
> I'm getting the same error with your latest VM. Any ideas?
>
> Bill
>
>
>

When I had trouble with this it was a 64bit vs 32bit library mismatch on a
64bit OS.

Is it a 32 bit or 64 bit OS? Is the library you're trying to reach 32bit?
64bit libs won't work with the 32bit CogVM, but are installed by default by
the Ubuntu package manager on a 64bit Ubuntu.

Ubuntu also moved some mandatory (from Cog's perspectvie) 32 bit libs from
their ia32-libs package to the ia32-libs-multiarch recently but I don't know
if that change affects Lucid.

--
View this message in context: http://forum.world.st/Cog-linux-external-module-not-found-tp4271136p4271354.html
Sent from the Pharo Smalltalk mailing list archive at Nabble.com.

--
best,
Eliot

--
Mariano
http://marianopeck.wordpress.com