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Fix #10027. st_nlink not set on Windows calls to os.stat/lstat. 

Note: This patch has no tests because as of now there is no way to create
links. #8879 adds that and the tests will go in there. I've manually observed
that existing links on my system function properly with this.
This commit is contained in:
Brian Curtin 2010-11-24 13:14:05 +00:00
parent 59540f23ee
commit f5e76d01ea
2 changed files with 311 additions and 331 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Misc/NEWS
View File

@ -10,6 +10,9 @@ What's New in Python 3.2 Beta 1?
Core and Builtins
-----------------
- Issue #10027. st_nlink was not being set on Windows calls to os.stat or
os.lstat. Patch by Hirokazu Yamamoto.
- Issue #10474: range().count() should return integers.
- Issue #10255: Fix reference leak in Py_InitializeEx(). Patch by Neil

637
Modules/posixmodule.c
View File

@ -437,6 +437,96 @@ _PyVerify_fd_dup2(int fd1, int fd2)
#define _PyVerify_fd_dup2(A, B) (1)
#endif
/* The following structure was copied from
http://msdn.microsoft.com/en-us/library/ms791514.aspx as the required
include doesn't seem to be present in the Windows SDK (at least as included
with Visual Studio Express). */
typedef struct _REPARSE_DATA_BUFFER {
ULONG ReparseTag;
USHORT ReparseDataLength;
USHORT Reserved;
union {
struct {
USHORT SubstituteNameOffset;
USHORT SubstituteNameLength;
USHORT PrintNameOffset;
USHORT PrintNameLength;
ULONG Flags;
WCHAR PathBuffer[1];
} SymbolicLinkReparseBuffer;
struct {
USHORT SubstituteNameOffset;
USHORT SubstituteNameLength;
USHORT PrintNameOffset;
USHORT PrintNameLength;
WCHAR PathBuffer[1];
} MountPointReparseBuffer;
struct {
UCHAR DataBuffer[1];
} GenericReparseBuffer;
};
} REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
#define REPARSE_DATA_BUFFER_HEADER_SIZE FIELD_OFFSET(REPARSE_DATA_BUFFER,\
GenericReparseBuffer)
#define MAXIMUM_REPARSE_DATA_BUFFER_SIZE ( 16 * 1024 )
static int
_Py_ReadLink(HANDLE reparse_point_handle, ULONG *reparse_tag, wchar_t **target_path)
{
char target_buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
REPARSE_DATA_BUFFER *rdb = (REPARSE_DATA_BUFFER *)target_buffer;
DWORD n_bytes_returned;
const wchar_t *ptr;
wchar_t *buf;
size_t len;
if (0 == DeviceIoControl(
reparse_point_handle,
FSCTL_GET_REPARSE_POINT,
NULL, 0, /* in buffer */
target_buffer, sizeof(target_buffer),
&n_bytes_returned,
NULL)) /* we're not using OVERLAPPED_IO */
return 0;
if (reparse_tag)
*reparse_tag = rdb->ReparseTag;
if (target_path) {
switch (rdb->ReparseTag) {
case IO_REPARSE_TAG_SYMLINK:
/* XXX: Maybe should use SubstituteName? */
ptr = rdb->SymbolicLinkReparseBuffer.PathBuffer +
rdb->SymbolicLinkReparseBuffer.PrintNameOffset/sizeof(WCHAR);
len = rdb->SymbolicLinkReparseBuffer.PrintNameLength/sizeof(WCHAR);
break;
case IO_REPARSE_TAG_MOUNT_POINT:
ptr = rdb->MountPointReparseBuffer.PathBuffer +
rdb->MountPointReparseBuffer.SubstituteNameOffset/sizeof(WCHAR);
len = rdb->MountPointReparseBuffer.SubstituteNameLength/sizeof(WCHAR);
break;
default:
SetLastError(ERROR_REPARSE_TAG_MISMATCH); /* XXX: Proper error code? */
return 0;
}
buf = (wchar_t *)malloc(sizeof(wchar_t)*(len+1));
if (!buf) {
SetLastError(ERROR_OUTOFMEMORY);
return 0;
}
wcsncpy(buf, ptr, len);
buf[len] = L'\0';
if (wcsncmp(buf, L"\\??\\", 4) == 0)
buf[1] = L'\\';
*target_path = buf;
}
return 1;
}
/* Return a dictionary corresponding to the POSIX environment table */
#ifdef WITH_NEXT_FRAMEWORK
/* On Darwin/MacOSX a shared library or framework has no access to
@ -934,7 +1024,7 @@ attributes_to_mode(DWORD attr)
}
static int
attribute_data_to_stat(WIN32_FILE_ATTRIBUTE_DATA *info, struct win32_stat *result)
attribute_data_to_stat(BY_HANDLE_FILE_INFORMATION *info, struct win32_stat *result)
{
memset(result, 0, sizeof(*result));
result->st_mode = attributes_to_mode(info->dwFileAttributes);
@ -942,12 +1032,13 @@ attribute_data_to_stat(WIN32_FILE_ATTRIBUTE_DATA *info, struct win32_stat *resul
FILE_TIME_to_time_t_nsec(&info->ftCreationTime, &result->st_ctime, &result->st_ctime_nsec);
FILE_TIME_to_time_t_nsec(&info->ftLastWriteTime, &result->st_mtime, &result->st_mtime_nsec);
FILE_TIME_to_time_t_nsec(&info->ftLastAccessTime, &result->st_atime, &result->st_atime_nsec);
result->st_nlink = info->nNumberOfLinks;
return 0;
}
static BOOL
attributes_from_dir(LPCSTR pszFile, LPWIN32_FILE_ATTRIBUTE_DATA pfad)
attributes_from_dir(LPCSTR pszFile, BY_HANDLE_FILE_INFORMATION *info)
{
HANDLE hFindFile;
WIN32_FIND_DATAA FileData;
@ -955,17 +1046,19 @@ attributes_from_dir(LPCSTR pszFile, LPWIN32_FILE_ATTRIBUTE_DATA pfad)
if (hFindFile == INVALID_HANDLE_VALUE)
return FALSE;
FindClose(hFindFile);
pfad->dwFileAttributes = FileData.dwFileAttributes;
pfad->ftCreationTime = FileData.ftCreationTime;
pfad->ftLastAccessTime = FileData.ftLastAccessTime;
pfad->ftLastWriteTime = FileData.ftLastWriteTime;
pfad->nFileSizeHigh = FileData.nFileSizeHigh;
pfad->nFileSizeLow = FileData.nFileSizeLow;
memset(info, 0, sizeof(*info));
info->dwFileAttributes = FileData.dwFileAttributes;
info->ftCreationTime = FileData.ftCreationTime;
info->ftLastAccessTime = FileData.ftLastAccessTime;
info->ftLastWriteTime = FileData.ftLastWriteTime;
info->nFileSizeHigh = FileData.nFileSizeHigh;
info->nFileSizeLow = FileData.nFileSizeLow;
/* info->nNumberOfLinks = 1; */
return TRUE;
}
static BOOL
attributes_from_dir_w(LPCWSTR pszFile, LPWIN32_FILE_ATTRIBUTE_DATA pfad)
attributes_from_dir_w(LPCWSTR pszFile, BY_HANDLE_FILE_INFORMATION *info)
{
HANDLE hFindFile;
WIN32_FIND_DATAW FileData;
@ -973,15 +1066,185 @@ attributes_from_dir_w(LPCWSTR pszFile, LPWIN32_FILE_ATTRIBUTE_DATA pfad)
if (hFindFile == INVALID_HANDLE_VALUE)
return FALSE;
FindClose(hFindFile);
pfad->dwFileAttributes = FileData.dwFileAttributes;
pfad->ftCreationTime = FileData.ftCreationTime;
pfad->ftLastAccessTime = FileData.ftLastAccessTime;
pfad->ftLastWriteTime = FileData.ftLastWriteTime;
pfad->nFileSizeHigh = FileData.nFileSizeHigh;
pfad->nFileSizeLow = FileData.nFileSizeLow;
memset(info, 0, sizeof(*info));
info->dwFileAttributes = FileData.dwFileAttributes;
info->ftCreationTime = FileData.ftCreationTime;
info->ftLastAccessTime = FileData.ftLastAccessTime;
info->ftLastWriteTime = FileData.ftLastWriteTime;
info->nFileSizeHigh = FileData.nFileSizeHigh;
info->nFileSizeLow = FileData.nFileSizeLow;
/* info->nNumberOfLinks = 1; */
return TRUE;
}
#ifndef SYMLOOP_MAX
#define SYMLOOP_MAX ( 88 )
#endif
static int
win32_xstat_for_handle(HANDLE hFile, struct win32_stat *result, BOOL traverse, int depth);
static int
win32_xstat(const char *path, struct win32_stat *result, BOOL traverse, int depth)
{
int code;
HANDLE hFile;
BY_HANDLE_FILE_INFORMATION info;
const char *dot;
hFile = CreateFileA(
path,
0, /* desired access */
0, /* share mode */
NULL, /* security attributes */
OPEN_EXISTING,
/* FILE_FLAG_BACKUP_SEMANTICS is required to open a directory */
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_BACKUP_SEMANTICS|FILE_FLAG_OPEN_REPARSE_POINT,
NULL);
if(hFile == INVALID_HANDLE_VALUE) {
/* Either the target doesn't exist, or we don't have access to
get a handle to it. If the former, we need to return an error.
If the latter, we can use attributes_from_dir. */
if (GetLastError() != ERROR_SHARING_VIOLATION)
goto err;
else {
/* Could not get attributes on open file. Fall back to
reading the directory. */
if (!attributes_from_dir(path, &info))
/* Very strange. This should not fail now */
goto err;
if (traverse && (info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
/* Should traverse, but cannot open reparse point handle */
SetLastError(ERROR_SHARING_VIOLATION);
goto err;
}
attribute_data_to_stat(&info, result);
}
}
else {
code = win32_xstat_for_handle(hFile, result, traverse, depth);
CloseHandle(hFile);
if (code != 0)
return code;
}
/* Set S_IEXEC if it is an .exe, .bat, ... */
dot = strrchr(path, '.');
if (dot) {
if (stricmp(dot, ".bat") == 0 || stricmp(dot, ".cmd") == 0 ||
stricmp(dot, ".exe") == 0 || stricmp(dot, ".com") == 0)
result->st_mode |= 0111;
}
return 0;
err:
/* Protocol violation: we explicitly clear errno, instead of
setting it to a POSIX error. Callers should use GetLastError. */
errno = 0;
return -1;
}
static int
win32_xstat_w(const wchar_t *path, struct win32_stat *result, BOOL traverse, int depth)
{
int code;
HANDLE hFile;
BY_HANDLE_FILE_INFORMATION info;
const wchar_t *dot;
hFile = CreateFileW(
path,
0, /* desired access */
0, /* share mode */
NULL, /* security attributes */
OPEN_EXISTING,
/* FILE_FLAG_BACKUP_SEMANTICS is required to open a directory */
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_BACKUP_SEMANTICS|FILE_FLAG_OPEN_REPARSE_POINT,
NULL);
if(hFile == INVALID_HANDLE_VALUE) {
/* Either the target doesn't exist, or we don't have access to
get a handle to it. If the former, we need to return an error.
If the latter, we can use attributes_from_dir. */
if (GetLastError() != ERROR_SHARING_VIOLATION)
goto err;
else {
/* Could not get attributes on open file. Fall back to
reading the directory. */
if (!attributes_from_dir_w(path, &info))
/* Very strange. This should not fail now */
goto err;
if (traverse && (info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
/* Should traverse, but cannot open reparse point handle */
SetLastError(ERROR_SHARING_VIOLATION);
goto err;
}
attribute_data_to_stat(&info, result);
}
}
else {
code = win32_xstat_for_handle(hFile, result, traverse, depth);
CloseHandle(hFile);
if (code != 0)
return code;
}
/* Set S_IEXEC if it is an .exe, .bat, ... */
dot = wcsrchr(path, '.');
if (dot) {
if (_wcsicmp(dot, L".bat") == 0 || _wcsicmp(dot, L".cmd") == 0 ||
_wcsicmp(dot, L".exe") == 0 || _wcsicmp(dot, L".com") == 0)
result->st_mode |= 0111;
}
return 0;
err:
/* Protocol violation: we explicitly clear errno, instead of
setting it to a POSIX error. Callers should use GetLastError. */
errno = 0;
return -1;
}
static int
win32_xstat_for_handle(HANDLE hFile, struct win32_stat *result, BOOL traverse, int depth)
{
int code;
BOOL reparse_tag;
wchar_t *target_path;
BY_HANDLE_FILE_INFORMATION info;
if (!GetFileInformationByHandle(hFile, &info))
return -1;
if (info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
if (traverse) {
if (depth + 1 > SYMLOOP_MAX) {
SetLastError(ERROR_CANT_RESOLVE_FILENAME); /* XXX: ELOOP? */
return -1;
}
if (!_Py_ReadLink(hFile, NULL, &target_path))
return -1;
code = win32_xstat_w(target_path, result, traverse, depth + 1);
free(target_path);
return code;
} else {
if (!_Py_ReadLink(hFile, &reparse_tag, NULL))
return -1;
attribute_data_to_stat(&info, result);
if (reparse_tag == IO_REPARSE_TAG_SYMLINK) {
/* first clear the S_IFMT bits */
result->st_mode ^= (result->st_mode & 0170000);
/* now set the bits that make this a symlink */
result->st_mode |= 0120000;
}
}
} else {
attribute_data_to_stat(&info, result);
}
return 0;
}
/* About the following functions: win32_lstat, win32_lstat_w, win32_stat,
win32_stat_w
@ -999,289 +1262,25 @@ attributes_from_dir_w(LPCWSTR pszFile, LPWIN32_FILE_ATTRIBUTE_DATA pfad)
static int
win32_lstat(const char* path, struct win32_stat *result)
{
WIN32_FILE_ATTRIBUTE_DATA info;
int code;
char *dot;
WIN32_FIND_DATAA find_data;
HANDLE find_data_handle;
if (!GetFileAttributesExA(path, GetFileExInfoStandard, &info)) {
if (GetLastError() != ERROR_SHARING_VIOLATION) {
/* Protocol violation: we explicitly clear errno, instead of
setting it to a POSIX error. Callers should use GetLastError. */
errno = 0;
return -1;
} else {
/* Could not get attributes on open file. Fall back to
reading the directory. */
if (!attributes_from_dir(path, &info)) {
/* Very strange. This should not fail now */
errno = 0;
return -1;
}
}
}
code = attribute_data_to_stat(&info, result);
if (code != 0)
return code;
/* Get WIN32_FIND_DATA structure for the path to determine if
it is a symlink */
if(info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
find_data_handle = FindFirstFileA(path, &find_data);
if(find_data_handle != INVALID_HANDLE_VALUE) {
if(find_data.dwReserved0 == IO_REPARSE_TAG_SYMLINK) {
/* first clear the S_IFMT bits */
result->st_mode ^= (result->st_mode & 0170000);
/* now set the bits that make this a symlink */
result->st_mode |= 0120000;
}
FindClose(find_data_handle);
}
}
/* Set S_IFEXEC if it is an .exe, .bat, ... */
dot = strrchr(path, '.');
if (dot) {
if (stricmp(dot, ".bat") == 0 || stricmp(dot, ".cmd") == 0 ||
stricmp(dot, ".exe") == 0 || stricmp(dot, ".com") == 0)
result->st_mode |= 0111;
}
return code;
return win32_xstat(path, result, FALSE, 0);
}
static int
win32_lstat_w(const wchar_t* path, struct win32_stat *result)
{
int code;
const wchar_t *dot;
WIN32_FILE_ATTRIBUTE_DATA info;
WIN32_FIND_DATAW find_data;
HANDLE find_data_handle;
if (!GetFileAttributesExW(path, GetFileExInfoStandard, &info)) {
if (GetLastError() != ERROR_SHARING_VIOLATION) {
/* Protocol violation: we explicitly clear errno, instead of
setting it to a POSIX error. Callers should use GetLastError. */
errno = 0;
return -1;
} else {
/* Could not get attributes on open file. Fall back to reading
the directory. */
if (!attributes_from_dir_w(path, &info)) {
/* Very strange. This should not fail now */
errno = 0;
return -1;
}
}
}
code = attribute_data_to_stat(&info, result);
if (code < 0)
return code;
/* Get WIN32_FIND_DATA structure for the path to determine if
it is a symlink */
if(info.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
find_data_handle = FindFirstFileW(path, &find_data);
if(find_data_handle != INVALID_HANDLE_VALUE) {
if(find_data.dwReserved0 == IO_REPARSE_TAG_SYMLINK) {
/* first clear the S_IFMT bits */
result->st_mode ^= (result->st_mode & 0170000);
/* now set the bits that make this a symlink */
result->st_mode |= 0120000;
}
FindClose(find_data_handle);
}
}
/* Set IFEXEC if it is an .exe, .bat, ... */
dot = wcsrchr(path, '.');
if (dot) {
if (_wcsicmp(dot, L".bat") == 0 || _wcsicmp(dot, L".cmd") == 0 ||
_wcsicmp(dot, L".exe") == 0 || _wcsicmp(dot, L".com") == 0)
result->st_mode |= 0111;
}
return code;
}
/* Grab GetFinalPathNameByHandle dynamically from kernel32 */
static int has_GetFinalPathNameByHandle = 0;
static DWORD (CALLBACK *Py_GetFinalPathNameByHandleA)(HANDLE, LPSTR, DWORD,
DWORD);
static DWORD (CALLBACK *Py_GetFinalPathNameByHandleW)(HANDLE, LPWSTR, DWORD,
DWORD);
static int
check_GetFinalPathNameByHandle()
{
HINSTANCE hKernel32;
/* only recheck */
if (!has_GetFinalPathNameByHandle)
{
hKernel32 = GetModuleHandle("KERNEL32");
*(FARPROC*)&Py_GetFinalPathNameByHandleA = GetProcAddress(hKernel32,
"GetFinalPathNameByHandleA");
*(FARPROC*)&Py_GetFinalPathNameByHandleW = GetProcAddress(hKernel32,
"GetFinalPathNameByHandleW");
has_GetFinalPathNameByHandle = Py_GetFinalPathNameByHandleA &&
Py_GetFinalPathNameByHandleW;
}
return has_GetFinalPathNameByHandle;
return win32_xstat_w(path, result, FALSE, 0);
}
static int
win32_stat(const char* path, struct win32_stat *result)
{
/* Traverse the symlink to the target using
GetFinalPathNameByHandle()
*/
int code;
HANDLE hFile;
int buf_size;
char *target_path;
int result_length;
WIN32_FILE_ATTRIBUTE_DATA info;
if(!check_GetFinalPathNameByHandle()) {
/* if the OS doesn't have GetFinalPathNameByHandle, it doesn't
have symlinks, so just fall back to the traditional behavior
found in lstat. */
return win32_lstat(path, result);
}
hFile = CreateFileA(
path,
0, /* desired access */
0, /* share mode */
NULL, /* security attributes */
OPEN_EXISTING,
/* FILE_FLAG_BACKUP_SEMANTICS is required to open a directory */
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_BACKUP_SEMANTICS,
NULL);
if(hFile == INVALID_HANDLE_VALUE) {
/* Either the target doesn't exist, or we don't have access to
get a handle to it. If the former, we need to return an error.
If the latter, we can use attributes_from_dir. */
if (GetLastError() != ERROR_SHARING_VIOLATION) {
/* Protocol violation: we explicitly clear errno, instead of
setting it to a POSIX error. Callers should use GetLastError. */
errno = 0;
return -1;
} else {
/* Could not get attributes on open file. Fall back to
reading the directory. */
if (!attributes_from_dir(path, &info)) {
/* Very strange. This should not fail now */
errno = 0;
return -1;
}
}
code = attribute_data_to_stat(&info, result);
}
else {
/* We have a good handle to the target, use it to determine the target
path name (then we'll call lstat on it). */
buf_size = Py_GetFinalPathNameByHandleA(hFile, 0, 0, VOLUME_NAME_DOS);
if(!buf_size) return -1;
/* Due to a slight discrepancy between GetFinalPathNameByHandleA
and GetFinalPathNameByHandleW, we must allocate one more byte
than reported. */
target_path = (char *)malloc((buf_size+2)*sizeof(char));
result_length = Py_GetFinalPathNameByHandleA(hFile, target_path,
buf_size+1, VOLUME_NAME_DOS);
if(!result_length) {
free(target_path);
return -1;
}
if(!CloseHandle(hFile)) {
free(target_path);
return -1;
}
target_path[result_length] = 0;
code = win32_lstat(target_path, result);
free(target_path);
}
return code;
return win32_xstat(path, result, TRUE, 0);
}
static int
win32_stat_w(const wchar_t* path, struct win32_stat *result)
{
/* Traverse the symlink to the target using GetFinalPathNameByHandle() */
int code;
HANDLE hFile;
int buf_size;
wchar_t *target_path;
int result_length;
WIN32_FILE_ATTRIBUTE_DATA info;
if(!check_GetFinalPathNameByHandle()) {
/* If the OS doesn't have GetFinalPathNameByHandle, it doesn't have
symlinks, so just fall back to the traditional behavior found
in lstat. */
return win32_lstat_w(path, result);
}
hFile = CreateFileW(
path,
0, /* desired access */
0, /* share mode */
NULL, /* security attributes */
OPEN_EXISTING,
/* FILE_FLAG_BACKUP_SEMANTICS is required to open a directory */
FILE_ATTRIBUTE_NORMAL|FILE_FLAG_BACKUP_SEMANTICS,
NULL);
if(hFile == INVALID_HANDLE_VALUE) {
/* Either the target doesn't exist, or we don't have access to
get a handle to it. If the former, we need to return an error.
If the latter, we can use attributes_from_dir. */
if (GetLastError() != ERROR_SHARING_VIOLATION) {
/* Protocol violation: we explicitly clear errno, instead of
setting it to a POSIX error. Callers should use GetLastError. */
errno = 0;
return -1;
} else {
/* Could not get attributes on open file. Fall back to
reading the directory. */
if (!attributes_from_dir_w(path, &info)) {
/* Very strange. This should not fail now */
errno = 0;
return -1;
}
}
code = attribute_data_to_stat(&info, result);
}
else {
/* We have a good handle to the target, use it to determine the target
path name (then we'll call lstat on it). */
buf_size = Py_GetFinalPathNameByHandleW(hFile, 0, 0, VOLUME_NAME_DOS);
if(!buf_size)
return -1;
target_path = (wchar_t *)malloc((buf_size+1)*sizeof(wchar_t));
result_length = Py_GetFinalPathNameByHandleW(hFile, target_path,
buf_size, VOLUME_NAME_DOS);
if(!result_length) {
free(target_path);
return -1;
}
if(!CloseHandle(hFile)) {
free(target_path);
return -1;
}
target_path[result_length] = 0;
code = win32_lstat_w(target_path, result);
free(target_path);
}
return code;
return win32_xstat_w(path, result, TRUE, 0);
}
static int
@ -1326,17 +1325,8 @@ win32_fstat(int file_number, struct win32_stat *result)
return -1;
}
/* similar to stat() */
result->st_mode = attributes_to_mode(info.dwFileAttributes);
result->st_size = (((__int64)info.nFileSizeHigh)<<32) + info.nFileSizeLow;
FILE_TIME_to_time_t_nsec(&info.ftCreationTime, &result->st_ctime,
&result->st_ctime_nsec);
FILE_TIME_to_time_t_nsec(&info.ftLastWriteTime, &result->st_mtime,
&result->st_mtime_nsec);
FILE_TIME_to_time_t_nsec(&info.ftLastAccessTime, &result->st_atime,
&result->st_atime_nsec);
attribute_data_to_stat(&info, result);
/* specific to fstat() */
result->st_nlink = info.nNumberOfLinks;
result->st_ino = (((__int64)info.nFileIndexHigh)<<32) + info.nFileIndexLow;
return 0;
}
@ -2644,6 +2634,30 @@ posix__getfullpathname(PyObject *self, PyObject *args)
return PyBytes_FromString(outbuf);
} /* end of posix__getfullpathname */
/* Grab GetFinalPathNameByHandle dynamically from kernel32 */
static int has_GetFinalPathNameByHandle = 0;
static DWORD (CALLBACK *Py_GetFinalPathNameByHandleA)(HANDLE, LPSTR, DWORD,
DWORD);
static DWORD (CALLBACK *Py_GetFinalPathNameByHandleW)(HANDLE, LPWSTR, DWORD,
DWORD);
static int
check_GetFinalPathNameByHandle()
{
HINSTANCE hKernel32;
/* only recheck */
if (!has_GetFinalPathNameByHandle)
{
hKernel32 = GetModuleHandle("KERNEL32");
*(FARPROC*)&Py_GetFinalPathNameByHandleA = GetProcAddress(hKernel32,
"GetFinalPathNameByHandleA");
*(FARPROC*)&Py_GetFinalPathNameByHandleW = GetProcAddress(hKernel32,
"GetFinalPathNameByHandleW");
has_GetFinalPathNameByHandle = Py_GetFinalPathNameByHandleA &&
Py_GetFinalPathNameByHandleW;
}
return has_GetFinalPathNameByHandle;
}
/* A helper function for samepath on windows */
static PyObject *
posix__getfinalpathname(PyObject *self, PyObject *args)
@ -5044,43 +5058,6 @@ PyDoc_STRVAR(win_readlink__doc__,
"readlink(path) -> path\n\n\
Return a string representing the path to which the symbolic link points.");
/* The following structure was copied from
http://msdn.microsoft.com/en-us/library/ms791514.aspx as the required
include doesn't seem to be present in the Windows SDK (at least as included
with Visual Studio Express). */
typedef struct _REPARSE_DATA_BUFFER {
ULONG ReparseTag;
USHORT ReparseDataLength;
USHORT Reserved;
union {
struct {
USHORT SubstituteNameOffset;
USHORT SubstituteNameLength;
USHORT PrintNameOffset;
USHORT PrintNameLength;
ULONG Flags;
WCHAR PathBuffer[1];
} SymbolicLinkReparseBuffer;
struct {
USHORT SubstituteNameOffset;
USHORT SubstituteNameLength;
USHORT PrintNameOffset;
USHORT PrintNameLength;
WCHAR PathBuffer[1];
} MountPointReparseBuffer;
struct {
UCHAR DataBuffer[1];
} GenericReparseBuffer;
};
} REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
#define REPARSE_DATA_BUFFER_HEADER_SIZE FIELD_OFFSET(REPARSE_DATA_BUFFER,\
GenericReparseBuffer)
#define MAXIMUM_REPARSE_DATA_BUFFER_SIZE ( 16 * 1024 )
/* Windows readlink implementation */
static PyObject *
win_readlink(PyObject *self, PyObject *args)