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/* NBD client library in userspace
* Copyright Red Hat
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* These are the hand-written Python module bindings. The majority of
* bindings are generated, see python/methods.c
*/
#include <config.h>
#define PY_SSIZE_T_CLEAN 1
#include <Python.h>
#if PY_MAJOR_VERSION == 2
#error \
These bindings will not work with Python 2. \
Recompile using Python 3 or use ./configure --disable-python.
#endif
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <libnbd.h>
#include "iszero.h"
#include "version.h"
#include "methods.h"
static inline PyObject *
put_handle (struct nbd_handle *h)
{
assert (h);
return PyCapsule_New (h, "nbd_handle", NULL);
}
PyObject *
nbd_internal_py_create (PyObject *self, PyObject *args)
{
struct nbd_handle *h;
if (!PyArg_ParseTuple (args, ":nbd_create"))
return NULL;
h = nbd_create ();
if (h == NULL) {
PyErr_SetString (PyExc_RuntimeError, nbd_get_error ());
return NULL;
}
return put_handle (h);
}
PyObject *
nbd_internal_py_close (PyObject *self, PyObject *args)
{
PyObject *py_h;
struct nbd_handle *h;
if (!PyArg_ParseTuple (args, "O:nbd_close", &py_h))
return NULL;
h = get_handle (py_h);
nbd_close (h);
Py_INCREF (Py_None);
return Py_None;
}
/* A wrapper around common/utils/version.c:display_version, used when
* you do "nbdsh --version".
*/
PyObject *
nbd_internal_py_display_version (PyObject *self, PyObject *args)
{
const char *program_name;
if (!PyArg_ParseTuple (args, "s:display_version", &program_name))
return NULL;
display_version (program_name);
Py_INCREF (Py_None);
return Py_None;
}
/* Return new reference to MemoryView wrapping buffer or aio_buffer contents.
* buffertype is PyBUF_READ or PyBUF_WRITE, for how the buffer will be used
* (remember, aio_pwrite READS the buffer, aio_pread WRITES into the buffer).
*/
PyObject *
nbd_internal_py_get_aio_view (PyObject *object, int buffertype)
{
PyObject *buffer = NULL;
if (PyObject_CheckBuffer (object))
buffer = object;
else if (PyObject_IsInstance (object,
nbd_internal_py_get_nbd_buffer_type ())) {
buffer = PyObject_GetAttrString (object, "_o");
if (buffertype == PyBUF_READ &&
! PyObject_HasAttrString (object, "_init")) {
assert (PyByteArray_Check (buffer));
memset (PyByteArray_AS_STRING (buffer), 0,
PyByteArray_GET_SIZE (buffer));
if (PyObject_SetAttrString (object, "_init", Py_True) < 0)
return NULL;
}
}
if (buffer)
return PyMemoryView_GetContiguous (buffer, buffertype, 'A');
PyErr_SetString (PyExc_TypeError,
"aio_buffer: expecting buffer or nbd.Buffer instance");
return NULL;
}
int
nbd_internal_py_init_aio_buffer (PyObject *object)
{
if (PyObject_IsInstance (object, nbd_internal_py_get_nbd_buffer_type ()))
return PyObject_SetAttrString (object, "_init", Py_True);
return 0;
}
/* Allocate an uninitialized persistent buffer used for nbd_aio_pread. */
PyObject *
nbd_internal_py_alloc_aio_buffer (PyObject *self, PyObject *args)
{
Py_ssize_t len;
if (!PyArg_ParseTuple (args, "n:nbd_internal_py_alloc_aio_buffer",
&len))
return NULL;
/* Constructing bytearray(len) in python zeroes the memory; doing it this
* way gives uninitialized memory. This correctly flags negative len.
*/
return PyByteArray_FromStringAndSize (NULL, len);
}
PyObject *
nbd_internal_py_aio_buffer_is_zero (PyObject *self, PyObject *args)
{
Py_buffer buf;
Py_ssize_t offset, size;
int init;
PyObject *ret = NULL;
if (!PyArg_ParseTuple (args,
"y*nnp:nbd_internal_py_aio_buffer_is_zero",
&buf, &offset, &size, &init))
return NULL;
if (size == 0) {
ret = Py_True;
goto out;
}
/* Check the bounds of the offset. */
if (offset < 0 || offset > buf.len) {
PyErr_SetString (PyExc_IndexError, "offset out of range");
goto out;
}
/* Compute or check the length. */
if (size == -1)
size = buf.len - offset;
else if (size < 0) {
PyErr_SetString (PyExc_IndexError,
"size cannot be negative, "
"except -1 to mean to the end of the buffer");
goto out;
}
else if ((size_t)offset + size > buf.len) {
PyErr_SetString (PyExc_IndexError, "size out of range");
goto out;
}
if (!init || is_zero (buf.buf + offset, size))
ret = Py_True;
else
ret = Py_False;
out:
PyBuffer_Release (&buf);
Py_XINCREF (ret);
return ret;
}
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