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Issue #3139: Make buffer-interface thread-safe wrt. PyArg_ParseTuple,

Browse source 
by denying s# to parse objects that have a releasebuffer procedure,
and introducing s*.

More module might need to get converted to use s*.
This commit is contained in:
Martin v. Löwis 2008-08-12 14:49:50 +00:00
parent aa8efbf084
commit f91d46a17d
16 changed files with 460 additions and 273 deletions
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15
Modules/_fileio.c
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@ -357,7 +357,7 @@ fileio_seekable(PyFileIOObject *self)
static PyObject *
fileio_readinto(PyFileIOObject *self, PyObject *args)
{
char *ptr;
Py_buffer pbuf;
Py_ssize_t n;
if (self->fd < 0)
@ -365,13 +365,14 @@ fileio_readinto(PyFileIOObject *self, PyObject *args)
if (!self->readable)
return err_mode("reading");
if (!PyArg_ParseTuple(args, "w#", &ptr, &n))
if (!PyArg_ParseTuple(args, "w*", &pbuf))
return NULL;
Py_BEGIN_ALLOW_THREADS
errno = 0;
n = read(self->fd, ptr, n);
n = read(self->fd, pbuf.buf, pbuf.len);
Py_END_ALLOW_THREADS
PyBuffer_Release(&pbuf);
if (n < 0) {
if (errno == EAGAIN)
Py_RETURN_NONE;
@ -489,22 +490,24 @@ fileio_read(PyFileIOObject *self, PyObject *args)
static PyObject *
fileio_write(PyFileIOObject *self, PyObject *args)
{
Py_buffer pbuf;
Py_ssize_t n;
char *ptr;
if (self->fd < 0)
return err_closed();
if (!self->writable)
return err_mode("writing");
if (!PyArg_ParseTuple(args, "s#", &ptr, &n))
if (!PyArg_ParseTuple(args, "s*", &pbuf))
return NULL;
Py_BEGIN_ALLOW_THREADS
errno = 0;
n = write(self->fd, ptr, n);
n = write(self->fd, pbuf.buf, pbuf.len);
Py_END_ALLOW_THREADS
PyBuffer_Release(&pbuf);
if (n < 0) {
if (errno == EAGAIN)
Py_RETURN_NONE;