Am 21.02.2013 um 01:15 schrieb gl...@twistedmatrix.com:
> Also, a Python traceback from the invocation of sendmsg() would be helpful.
I need some advice, how to do that.
> The 'ancillary' that your debug code is printing is the Python argument
> value for 'ancillary', which means that Python code is getting invoked with
> no ancillary list. There are only two invocations of sendmsg in the whole
> codebase, and the one that sends the FD is hard-coded to pass a list with one
> element in it along (in sendfd). sendmsg is also called to report status
> from the worker to the master, and that's expected to come along with no
> sendmsg arguments.
I suspect a portability issue in PyArg_ParseTupleAndKeywords().
This patch in twext.python.sendfd.recvfd:
---
data, flags, ancillary = recvmsg(socketfd)
[(cmsg_level, cmsg_type, packedFD)] = ancillary
# cmsg_level and cmsg_type really need to be SOL_SOCKET / SCM_RIGHTS, but
# since those are the *only* standard values, there's not much point in
# checking.
if len(packedFD) != calcsize("i"):
err_msg = str("recvfd: packedFD [%d] not %d bytes long" %
(len(packedFD),calcsize("i")))
print err_msg
raise ValueError(err_msg)
[unpackedFD] = unpack("i", packedFD)
return (unpackedFD, data)
---
shows that there are 8 bytes returned for the fd instead of 4:
---
File
"/usr/local/lib/python2.7/site-packages/twisted/internet/kqreactor.py", line
279, in _doWriteOrRead
why = selectable.doRead()
File
"/usr/local/lib/python2.7/site-packages/Calendar_and_Contacts_Server-4.2-py2.7-freebsd-9.1-RELEASE-amd64.egg/twext/internet/sendfdport.py",
line 281, in doRead
fd, description = recvfd(self.fd)
File
"/usr/local/lib/python2.7/site-packages/Calendar_and_Contacts_Server-4.2-py2.7-freebsd-9.1-RELEASE-amd64.egg/twext/python/sendfd.py",
line 72, in recvfd
raise ValueError(err_msg)
exceptions.ValueError: recvfd: packedFD [8] not 4 bytes long
---
Might platform related too.
Axel
---
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