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Merged revisions 81517 via svnmerge from 

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r81517 | brian.curtin | 2010-05-25 10:06:15 -0500 (Tue, 25 May 2010) | 5 lines

  Fix #2810 - handle the case where some registry calls return
  ERROR_MORE_DATA, requiring another call to get the remaining data.

  Patch by Daniel Stutzbach
........
This commit is contained in:
Brian Curtin 2010-05-26 13:24:57 +00:00
parent c3e40e0454
commit b7b21f1ea4
3 changed files with 163 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
Lib/test/test_winreg.py
View File

@ -6,6 +6,8 @@ import os, sys
import unittest
from test import test_support
threading = test_support.import_module("threading")
from platform import machine
test_key_name = "SOFTWARE\\Python Registry Test Key - Delete Me"
@ -166,6 +168,58 @@ class WinregTests(unittest.TestCase):
self.assertEqual(type(r), unicode)
self.assertEqual(r, os.environ["windir"] + "\\test")
def test_changing_value(self):
# Issue2810: A race condition in 2.6 and 3.1 may cause
# EnumValue or QueryValue to throw "WindowsError: More data is
# available"
done = False
class VeryActiveThread(threading.Thread):
def run(self):
with CreateKey(HKEY_CURRENT_USER, test_key_name) as key:
use_short = True
long_string = 'x'*2000
while not done:
s = 'x' if use_short else long_string
use_short = not use_short
SetValue(key, 'changing_value', REG_SZ, s)
thread = VeryActiveThread()
thread.start()
try:
with CreateKey(HKEY_CURRENT_USER,
test_key_name+'\\changing_value') as key:
for _ in range(1000):
num_subkeys, num_values, t = QueryInfoKey(key)
for i in range(num_values):
name = EnumValue(key, i)
QueryValue(key, name[0])
finally:
done = True
thread.join()
DeleteKey(HKEY_CURRENT_USER, test_key_name+'\\changing_value')
DeleteKey(HKEY_CURRENT_USER, test_key_name)
def test_long_key(self):
# Issue2810, in 2.6 and 3.1 when the key name was exactly 256
# characters, EnumKey threw "WindowsError: More data is
# available"
name = 'x'*256
try:
with CreateKey(HKEY_CURRENT_USER, test_key_name) as key:
SetValue(key, name, REG_SZ, 'x')
num_subkeys, num_values, t = QueryInfoKey(key)
EnumKey(key, 0)
finally:
DeleteKey(HKEY_CURRENT_USER, '\\'.join((test_key_name, name)))
DeleteKey(HKEY_CURRENT_USER, test_key_name)
def test_dynamic_key(self):
# Issue2810, when the value is dynamically generated, these
# throw "WindowsError: More data is available" in 2.6 and 3.1
EnumValue(HKEY_PERFORMANCE_DATA, 0)
QueryValueEx(HKEY_PERFORMANCE_DATA, None)
def test_main():
test_support.run_unittest(WinregTests)

6
Misc/NEWS
View File

@ -225,6 +225,12 @@ Library
- Issue #7356: ctypes.util: Make parsing of ldconfig output independent of
the locale.
Extension Modules
-----------------
- Issue #2810: Fix cases where the Windows registry API returns
ERROR_MORE_DATA, requiring a re-try in order to get the complete result.
Build
-----

116
PC/_winreg.c
View File

@ -1071,7 +1071,14 @@ PyEnumKey(PyObject *self, PyObject *args)
int index;
long rc;
PyObject *retStr;
char tmpbuf[256]; /* max key name length is 255 */
/* The Windows docs claim that the max key name length is 255
* characters, plus a terminating nul character. However,
* empirical testing demonstrates that it is possible to
* create a 256 character key that is missing the terminating
* nul. RegEnumKeyEx requires a 257 character buffer to
* retrieve such a key name. */
char tmpbuf[257];
DWORD len = sizeof(tmpbuf); /* includes NULL terminator */
if (!PyArg_ParseTuple(args, "Oi:EnumKey", &obKey, &index))
@ -1098,8 +1105,8 @@ PyEnumValue(PyObject *self, PyObject *args)
long rc;
char *retValueBuf;
char *retDataBuf;
DWORD retValueSize;
DWORD retDataSize;
DWORD retValueSize, bufValueSize;
DWORD retDataSize, bufDataSize;
DWORD typ;
PyObject *obData;
PyObject *retVal;
@ -1117,6 +1124,8 @@ PyEnumValue(PyObject *self, PyObject *args)
"RegQueryInfoKey");
++retValueSize; /* include null terminators */
++retDataSize;
bufDataSize = retDataSize;
bufValueSize = retValueSize;
retValueBuf = (char *)PyMem_Malloc(retValueSize);
if (retValueBuf == NULL)
return PyErr_NoMemory();
@ -1126,6 +1135,8 @@ PyEnumValue(PyObject *self, PyObject *args)
return PyErr_NoMemory();
}
while (1) {
char *tmp;
Py_BEGIN_ALLOW_THREADS
rc = RegEnumValue(hKey,
index,
@ -1137,6 +1148,21 @@ PyEnumValue(PyObject *self, PyObject *args)
&retDataSize);
Py_END_ALLOW_THREADS
if (rc != ERROR_MORE_DATA)
break;
bufDataSize *= 2;
tmp = (char *)PyMem_Realloc(retDataBuf, bufDataSize);
if (tmp == NULL) {
PyErr_NoMemory();
retVal = NULL;
goto fail;
}
retDataBuf = tmp;
retDataSize = bufDataSize;
retValueSize = bufValueSize;
}
if (rc != ERROR_SUCCESS) {
retVal = PyErr_SetFromWindowsErrWithFunction(rc,
"PyRegEnumValue");
@ -1292,28 +1318,56 @@ PyQueryValue(PyObject *self, PyObject *args)
long rc;
PyObject *retStr;
char *retBuf;
long bufSize = 0;
DWORD bufSize = 0;
DWORD retSize = 0;
char *tmp;
if (!PyArg_ParseTuple(args, "Oz:QueryValue", &obKey, &subKey))
return NULL;
if (!PyHKEY_AsHKEY(obKey, &hKey, FALSE))
return NULL;
if ((rc = RegQueryValue(hKey, subKey, NULL, &bufSize))
!= ERROR_SUCCESS)
rc = RegQueryValue(hKey, subKey, NULL, &retSize);
if (rc == ERROR_MORE_DATA)
retSize = 256;
else if (rc != ERROR_SUCCESS)
return PyErr_SetFromWindowsErrWithFunction(rc,
"RegQueryValue");
retStr = PyString_FromStringAndSize(NULL, bufSize);
if (retStr == NULL)
return NULL;
retBuf = PyString_AS_STRING(retStr);
if ((rc = RegQueryValue(hKey, subKey, retBuf, &bufSize))
!= ERROR_SUCCESS) {
Py_DECREF(retStr);
bufSize = retSize;
retBuf = (char *) PyMem_Malloc(bufSize);
if (retBuf == NULL)
return PyErr_NoMemory();
while (1) {
retSize = bufSize;
rc = RegQueryValue(hKey, subKey, retBuf, &retSize);
if (rc != ERROR_MORE_DATA)
break;
bufSize *= 2;
tmp = (char *) PyMem_Realloc(retBuf, bufSize);
if (tmp == NULL) {
PyMem_Free(retBuf);
return PyErr_NoMemory();
}
retBuf = tmp;
}
if (rc != ERROR_SUCCESS) {
PyMem_Free(retBuf);
return PyErr_SetFromWindowsErrWithFunction(rc,
"RegQueryValue");
}
_PyString_Resize(&retStr, strlen(retBuf));
if (retBuf[retSize-1] == '\x00')
retSize--;
retStr = PyString_FromStringAndSize(retBuf, retSize);
if (retStr == NULL) {
PyMem_Free(retBuf);
return NULL;
}
return retStr;
}
@ -1325,8 +1379,8 @@ PyQueryValueEx(PyObject *self, PyObject *args)
char *valueName;
long rc;
char *retBuf;
DWORD bufSize = 0;
char *retBuf, *tmp;
DWORD bufSize = 0, retSize;
DWORD typ;
PyObject *obData;
PyObject *result;
@ -1336,18 +1390,34 @@ PyQueryValueEx(PyObject *self, PyObject *args)
if (!PyHKEY_AsHKEY(obKey, &hKey, FALSE))
return NULL;
if ((rc = RegQueryValueEx(hKey, valueName,
NULL, NULL, NULL,
&bufSize))
!= ERROR_SUCCESS)
rc = RegQueryValueEx(hKey, valueName, NULL, NULL, NULL, &bufSize);
if (rc == ERROR_MORE_DATA)
bufSize = 256;
else if (rc != ERROR_SUCCESS)
return PyErr_SetFromWindowsErrWithFunction(rc,
"RegQueryValueEx");
retBuf = (char *)PyMem_Malloc(bufSize);
if (retBuf == NULL)
return PyErr_NoMemory();
if ((rc = RegQueryValueEx(hKey, valueName, NULL,
&typ, (BYTE *)retBuf, &bufSize))
!= ERROR_SUCCESS) {
while (1) {
retSize = bufSize;
rc = RegQueryValueEx(hKey, valueName, NULL, &typ,
(BYTE *)retBuf, &retSize);
if (rc != ERROR_MORE_DATA)
break;
bufSize *= 2;
tmp = (char *) PyMem_Realloc(retBuf, bufSize);
if (tmp == NULL) {
PyMem_Free(retBuf);
return PyErr_NoMemory();
}
retBuf = tmp;
}
if (rc != ERROR_SUCCESS) {
PyMem_Free(retBuf);
return PyErr_SetFromWindowsErrWithFunction(rc,
"RegQueryValueEx");