On 07/09/2012 01:06 PM, Cleber Rosa wrote:
> On 07/05/2012 02:47 PM, Lucas Meneghel Rodrigues wrote:
>> On Thu, Jul 5, 2012 at 2:03 PM, lei yang <[email protected]> wrote:
>>> On Fri, Jul 6, 2012 at 12:33 AM, Qingtang Zhou <[email protected]> wrote:
>>>> * On 2012-07-06 00:12:43 +0800, lei yang ([email protected]) wrote:
>>>>> Hi list,
>>>>>
>>>>> some of my tests met below issue,seems a python2.7 issue,
>>>>>
>>>>> File "/autotest/client/virt/kvm_vm.py", line 2133, in migrate
>>>>> self.send_fd(fd_src, mig_fd_name)
>>>>> File "/autotest/client/shared/error.py", line 138, in new_fn
>>>>> return fn(*args, **kwargs)
>>>>> File "/autotest/client/virt/kvm_vm.py", line 2046, in send_fd
>>>>> self.monitor.cmd("getfd %s" % (fd_name), fd=fd)
>>>>> File "/autotest/client/virt/kvm_monitor.py", line 324, in cmd
>>>>> self._passfd = virt_passfd_setup.import_passfd()
>>>>> File "/autotest/client/virt/virt_passfd_setup.py", line 41, in
>>>>> import_passfd
>>>>> passfd_setup()
>>>>> File "/autotest/client/virt/virt_passfd_setup.py", line 28, in
>>>>> passfd_setup
>>>>> objects = c.compile(SOURCES, include_dirs=[PYTHON_HEADERS],
>>>>> extra_postargs=['-fPIC'])
>>>>> File "/usr/lib64/python2.7/distutils/ccompiler.py", line 624, in
>>>>> compile
>>>>> self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
>>>>> File "/usr/lib64/python2.7/distutils/unixccompiler.py", line 180,
>>>>> in _compile
>>>>> raise CompileError, msg
>>>>> CompileError: command 'cc' failed with exit status 1
>>>>>
>>>>> you can reproduce it with "migrate.with_blkdebug.fd" test cases
>>>>> how could I handle this, any workaround?
>> What happens here is the following: Code necessary to pass around file
>> descriptors from the test to qemu needs a custom c extension, that has
>> to be compiled on demand and it's shipped under client/virt/passfd.c,
>> if I recall correctly. If there's no c compiler/some compiler error
>> while trying to compile the code, this error will be thrown.
> ^ Being the one to blame for this code, I just want to ACK this
> explanation by Lucas.
>
>> So, it's likely that you don't have a compiler in the test machine. If
>> you can't afford to have a working toolchain in the host, then you
>> have to skip this test.
> ^ Yes, no way around it. Either have a compiler and Python header
> files, or skip the test. Whenever we move to Python 3k, this code will
> be dropped.
BTW, I did attempt to write a sendmsg() function using ctypes + libc,
but it was not really straightforward because of the data structures
layout. If anyone feels braver than myself, here's my initial draft:
import os
import sys
if (sys.version_info[0] == 2 and
sys.version_info[1] >= 5):
import ctypes
def get_libc():
libc_paths = ['/lib/libc.so.6', ]
for lib_path in libc_paths:
if os.path.exists(lib_path):
return ctypes.cdll.LoadLibrary(lib_path)
#
# Original iovec structure
#
# struct iovec
# {
# void *iov_base; /* Pointer to data. */
# size_t iov_len; /* Length of data. */
# };
class iovec(ctypes.Structure):
_fields_ = [("iov_base", ctypes.c_void_p),
("iov_len", ctypes.c_uint)]
#
# Original msgh structure
#
# struct msghdr
# {
# void *msg_name; /* Address to send to/receive from. */
# socklen_t msg_namelen; /* Length of address data. */
# struct iovec *msg_iov; /* Vector of data to send/receive
into. */
# size_t msg_iovlen; /* Number of elements in the vector. */
# void *msg_control; /* Ancillary data (eg BSD filedesc
passing). */
# size_t msg_controllen; /* Ancillary data buffer length.
# !! The type should be socklen_t but the
# definition of the kernel is
incompatible
# with this. */
# int msg_flags; /* Flags on received message. */
# };
class msghdr(ctypes.Structure):
_fields_ = [("msg_name", ctypes.c_void_p),
("msg_namelen", ctypes.c_uint),
("msg_iov", ctypes.POINTER(iovec)),
("msg_iovlen", ctypes.c_uint),
("msg_control", ctypes.c_void_p),
("msg_controllen", ctypes.c_uint)]
if __name__ == '__main__':
libc = get_libc()
sendmsg = libc.sendmsg
>
>> Let me know what works out for you,
>>
>> Lucas
>>
>
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