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3d1596b048
This patch introduces support for LXC specific public APIs. In
common with what was done for QEMU, this creates a libvirt_lxc.so
library and libvirt/libvirt-lxc.h header file.
The actual APIs are
int virDomainLxcOpenNamespace(virDomainPtr domain,
int **fdlist,
unsigned int flags);
int virDomainLxcEnterNamespace(virDomainPtr domain,
unsigned int nfdlist,
int *fdlist,
unsigned int *noldfdlist,
int **oldfdlist,
unsigned int flags);
which provide a way to use the setns() system call to move the
calling process into the container's namespace. It is not
practical to write in a generically applicable manner. The
nearest that we could get to such an API would be an API which
allows to pass a command + argv to be executed inside a
container. Even if we had such a generic API, this LXC specific
API is still useful, because it allows the caller to maintain
the current process context, in particular any I/O streams they
have open.
NB the virDomainLxcEnterNamespace() API is special in that it
runs client side, so does not involve the internal driver API.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/*
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* libvir.c: this modules implements the main part of the glue of the
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* libvir library and the Python interpreter. It provides the
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* entry points where an automatically generated stub is
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* unpractical
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*
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* Copyright (C) 2012-2013 Red Hat, Inc.
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*
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* Daniel Veillard <veillard@redhat.com>
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*/
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#include <config.h>
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/* Horrible kludge to work around even more horrible name-space pollution
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via Python.h. That file includes /usr/include/python2.5/pyconfig*.h,
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which has over 180 autoconf-style HAVE_* definitions. Shame on them. */
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#undef HAVE_PTHREAD_H
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#include <Python.h>
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#include "libvirt/libvirt-lxc.h"
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#include "libvirt/virterror.h"
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#include "typewrappers.h"
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#include "libvirt-lxc.h"
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#include "viralloc.h"
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#include "virfile.h"
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#ifndef __CYGWIN__
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extern void initlibvirtmod_lxc(void);
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#else
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extern void initcygvirtmod_lxc(void);
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#endif
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#if 0
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# define DEBUG_ERROR 1
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#endif
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#if DEBUG_ERROR
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# define DEBUG(fmt, ...) \
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printf(fmt, __VA_ARGS__)
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#else
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# define DEBUG(fmt, ...) \
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do {} while (0)
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#endif
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/* The two-statement sequence "Py_INCREF(Py_None); return Py_None;"
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is so common that we encapsulate it here. Now, each use is simply
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return VIR_PY_NONE; */
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#define VIR_PY_NONE (Py_INCREF (Py_None), Py_None)
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#define VIR_PY_INT_FAIL (libvirt_intWrap(-1))
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#define VIR_PY_INT_SUCCESS (libvirt_intWrap(0))
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/************************************************************************
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* *
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* Statistics *
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* *
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************************************************************************/
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static PyObject *
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libvirt_lxc_virDomainLxcOpenNamespace(PyObject *self ATTRIBUTE_UNUSED,
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PyObject *args) {
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PyObject *py_retval;
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virDomainPtr domain;
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PyObject *pyobj_domain;
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unsigned int flags;
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int c_retval;
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int *fdlist = NULL;
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int i;
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if (!PyArg_ParseTuple(args, (char *)"Oi:virDomainLxcOpenNamespace",
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&pyobj_domain, &flags))
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return NULL;
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domain = (virDomainPtr) PyvirDomain_Get(pyobj_domain);
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if (domain == NULL)
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return VIR_PY_NONE;
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LIBVIRT_BEGIN_ALLOW_THREADS;
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c_retval = virDomainLxcOpenNamespace(domain, &fdlist, flags);
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LIBVIRT_END_ALLOW_THREADS;
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if (c_retval < 0)
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return VIR_PY_NONE;
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py_retval = PyList_New(c_retval);
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for (i = 0 ; i < c_retval ; i++) {
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PyObject *item = NULL;
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if ((item = PyInt_FromLong(fdlist[i])) == NULL)
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goto error;
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if (PyList_Append(py_retval, item) < 0) {
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Py_DECREF(item);
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goto error;
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}
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}
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return py_retval;
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error:
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for (i = 0 ; i < c_retval ; i++) {
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VIR_FORCE_CLOSE(fdlist[i]);
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}
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VIR_FREE(fdlist);
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return VIR_PY_NONE;
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}
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/************************************************************************
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* *
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* The registration stuff *
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* *
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************************************************************************/
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static PyMethodDef libvirtLxcMethods[] = {
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#include "libvirt-lxc-export.c"
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{(char *) "virDomainLxcOpenNamespace", libvirt_lxc_virDomainLxcOpenNamespace, METH_VARARGS, NULL},
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{NULL, NULL, 0, NULL}
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};
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void
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#ifndef __CYGWIN__
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initlibvirtmod_lxc
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#else
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initcygvirtmod_lxc
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#endif
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(void)
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{
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static int initialized = 0;
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if (initialized != 0)
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return;
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if (virInitialize() < 0)
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return;
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/* initialize the python extension module */
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Py_InitModule((char *)
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#ifndef __CYGWIN__
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"libvirtmod_lxc"
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#else
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"cygvirtmod_lxc"
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#endif
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, libvirtLxcMethods);
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initialized = 1;
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}
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