[IronPython] ctypes on Mono

[Tristan Zajonc]

Both on OSX and Ubuntu it appears to fail on a call to PyDLL(None).  The
problematic call is from the block:

if _os.name in ("nt", "ce"):
    pythonapi = PyDLL("python dll", None, _sys.dllhandle)
elif _sys.platform == "cygwin":
    pythonapi = PyDLL("libpython%d.%d.dll" % _sys.version_info[:2])
else:
    print "DEBUG: NOT NT/CE OR CYGWIN."
    pythonapi = PyDLL(None)

It goes to CDLL base class and dies exactly here:

if handle is None:
    print "HANDLE: " + str(self._name) + str(mode)  #prints None0
    self._handle = _dlopen(self._name, mode)
    print "AFTER DLOPEN. DOESN'T PRINT."

Hope this helps.

Tristan

On Tue, Jun 1, 2010 at 1:34 PM, Dino Viehland <dinov at microsoft.com> wrote:

>  Any chance you can put a print in any calls to dlopen in
> ctypes\__init__.py and see what we’re trying to load?
>
>
>
> *From:* users-bounces at lists.ironpython.com [mailto:
> users-bounces at lists.ironpython.com] *On Behalf Of *Tristan Zajonc
> *Sent:* Sunday, May 30, 2010 3:57 PM
> *To:* Discussion of IronPython
> *Subject:* Re: [IronPython] ctypes on Mono
>
>
>
> (I'll look into OSX issue, although am happy to hear a solution from other
> users)
>
>
>
> I'm not sure why I don't get line numbers.  If I pass -XExceptionDetail, I
> don't get much more:
>
>
>
> tristanz at aontic1:~$ ipy -X:ExceptionDetail
>
> IronPython 2.6.1 (2.6.10920.0) on .NET 2.0.50727.1433
>
> Type "help", "copyright", "credits" or "license" for more information.
>
> >>> import ctypes
>
> cannot load library
>
> LoadLibrary at offset 0 in file:line:column <filename unknown>:0:0
>
> dlopen at offset 0 in file:line:column <filename unknown>:0:0
>
> Invoke at offset 0 in file:line:column <filename unknown>:0:0
>
>   at IronPython.Modules.CTypes.LoadLibrary (System.String library, Int32
> mode) [0x00000] in <filename unknown>:0
>
>   at IronPython.Modules.CTypes.dlopen (System.String library, Int32 mode)
> [0x00000] in <filename unknown>:0
>
>   at (wrapper managed-to-native)
> System.Reflection.MonoMethod:InternalInvoke
> (System.Reflection.MonoMethod*,object,object[],System.Exception&)
>
>   at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags
> invokeAttr, System.Reflection.Binder binder, System.Object[] parameters,
> System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
>
> OSError: IronPython.Runtime.Exceptions.OSException: cannot load library
>
>   at IronPython.Modules.CTypes.LoadLibrary (System.String library, Int32
> mode) [0x00000] in <filename unknown>:0
>
>   at IronPython.Modules.CTypes.dlopen (System.String library, Int32 mode)
> [0x00000] in <filename unknown>:0
>
>   at (wrapper managed-to-native)
> System.Reflection.MonoMethod:InternalInvoke
> (System.Reflection.MonoMethod*,object,object[],System.Exception&)
>
>   at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags
> invokeAttr, System.Reflection.Binder binder, System.Object[] parameters,
> System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
>
>
>
>
>
> On Sun, May 30, 2010 at 6:24 PM, Dino Viehland <dinov at microsoft.com>
> wrote:
>
> On OS/X I believe you need to use Mono’s DllMap feature (
> http://www.mono-project.com/Config_DllMap) to map from the Linux library
> name (libdl.so) to the Mac OS/X library which exports dlopen.  I actually
> have no clue what exports it and I don’t see one listed over here:
> http://gemma.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man3/dlopen.3.htmlso hopefully someone else on the list knows.
>
>
>
> It looks like on Linux the –X:ExceptionDetail command line option is being
> passed which is preventing the stack trace from having any line number
> information - or maybe the stack trace is cut off?  Either way it’d be
> useful to see the line number which is calling dlopen to understand what
> library we are failing to load.  My guess would be that it’s trying to load
> the Python library but I’d think that would work fine (it looks like we pass
> in a null path in that case which should be alright for dlopen).
>
>
>
>
>
> *From:* users-bounces at lists.ironpython.com [mailto:
> users-bounces at lists.ironpython.com] *On Behalf Of *Tristan Zajonc
>
>
> *Sent:* Saturday, May 29, 2010 3:59 PM
> *To:* Discussion of IronPython
>
> *Subject:* [IronPython] ctypes on Mono
>
>
>
> I'm running the the latest IronPython 2.6.1 (.NET 2.0 version) with Mono.
>  I cannot import ctypes.
>
>
>
> Is this behavior expected?  Any solutions?  Here are the exact results:
>
>
>
> On OSX:
>
> IronPython 2.6.1 (2.6.10920.0) on .NET 2.0.50727.1433
>
> Type "help", "copyright", "credits" or "license" for more information.
>
> >>> import ctypes
>
> Traceback (most recent call last):
>
> SystemError: libdl.so
>
>
>
> On Ubuntu (using trunk Mono):
>
>
>
> IronPython 2.6.1 (2.6.10920.0) on .NET 2.0.50727.1433
>
> Type "help", "copyright", "credits" or "license" for more information.
>
> >>> import ctypes
>
> Traceback (most recent call last):
>
> OSError: IronPython.Runtime.Exceptions.OSException: cannot load library
>
>   at IronPython.Modules.CTypes.LoadLibrary (System.String library, Int32
> mode) [0x00000] in <filename unknown>:0
>
>   at IronPython.Modules.CTypes.dlopen (System.String library, Int32 mode)
> [0x00000] in <filename unknown>:0
>
>   at (wrapper managed-to-native)
> System.Reflection.MonoMethod:InternalInvoke
> (System.Reflection.MonoMethod*,object,object[],System.Exception&)
>
>   at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags
> invokeAttr, System.Reflection.Binder binder, System.Object[] parameters,
> System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
>
>
>
>
>
> Best,
>
> Tristan
>
>
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