New submission from Eduardo Aguiar <[email protected]>:
At posixmodule.c (line 6306)
static PyObject *
posix_read(PyObject *self, PyObject *args)
{
int fd, size, n;
PyObject *buffer;
if (!PyArg_ParseTuple(args, "ii:read", &fd, &size))
return NULL;
if (size < 0) {
errno = EINVAL;
return posix_error();
}
buffer = PyString_FromStringAndSize((char *)NULL, size);
if (buffer == NULL)
return NULL;
Py_BEGIN_ALLOW_THREADS
n = read(fd, PyString_AsString(buffer), size);
Py_END_ALLOW_THREADS
if (n < 0) {
Py_DECREF(buffer);
return posix_error();
}
if (n != size)
_PyString_Resize(&buffer, n);
return buffer;
}
os.read does not work with O_DIRECT flag. It fails with errno = EINVAL.
>From read(2) man page:
EINVAL fd is attached to an object which is unsuitable for
reading; or
the file was opened with the O_DIRECT flag, and
either the
address specified in buf, the value specified in count,
or the
current file offset is not suitably aligned.
if os.open is called with O_DIRECT flag enabled, the buffer used in
"read" must be page aligned and "size" must be multiple of pagesize also.
----------
components: Library (Lib)
messages: 82938
nosy: aguiar
severity: normal
status: open
title: os.read not handling O_DIRECT flag
type: behavior
versions: Python 2.6
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Python tracker <[email protected]>
<http://bugs.python.org/issue5396>
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