Re: [Xen-devel] Problem in adding a function to tools/python/xen/lowlevel/xc/xc.c

[Brendan Cully <brendan@xxxxxxxxx>]

On Monday, 28 April 2008 at 11:33, sanjay kushwaha wrote:
...
> +static PyObject *pyxc_register_domm_xen(XcObject *self, PyObject *args)
> +{
> +    uint32_t dom;
> +
> +    if (!PyArg_ParseTuple(args, "i", &dom))
> +        return NULL;
> +
> +    if (xc_register_domm_xen(self->xc_handle, dom) != 0)
> +        return NULL;
> +
> +    Py_INCREF(zero);
> +    return zero;
> +}
> +
...
> The /var/log/xen/xend.log shows the following error
> 
> [2008-04-28 11:27:17 4132] ERROR (XendDomainInfo:443) VM start failed
> Traceback (most recent call last):
>   File "/root/ksanjay/hp/xen-unstable.hg/dist/install/usr/lib/python/xen/xend/
> XendDomainInfo.py", line 423, in start
>     XendTask.log_progress(31, 60, self._initDomain)
>   File "/root/ksanjay/hp/xen-unstable.hg/dist/install/usr/lib/python/xen/xend/
> XendTask.py", line 209, in log_progress
>     retval = func(*args, **kwds)
>   File "/root/ksanjay/hp/xen-unstable.hg/dist/install/usr/lib/python/xen/xend/
> XendDomainInfo.py", line 2175, in _initDomain
>     xc.register_domm_xen(self.domid)
> SystemError: error return without exception set

I believe this exception means you're returning NULL. When you do this, you need
to set an exception message (e.g. using PyErr_Set*) first. Looking at your
code, the culprit is probably the 'return NULL' after your call to
xc_register_domm_xen.

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