2003-11-12 00:52:45 +01:00
|
|
|
/*-------------------------------------------------------------------------
|
|
|
|
*
|
|
|
|
* dirmod.c
|
2009-05-04 11:30:06 +02:00
|
|
|
* directory handling functions
|
2003-11-12 00:52:45 +01:00
|
|
|
*
|
2021-01-02 19:06:25 +01:00
|
|
|
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
|
2003-11-12 00:52:45 +01:00
|
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
|
|
*
|
2009-05-04 11:30:06 +02:00
|
|
|
* This includes replacement versions of functions that work on
|
|
|
|
* Win32 (NT4 and newer).
|
2003-11-12 00:52:45 +01:00
|
|
|
*
|
|
|
|
* IDENTIFICATION
|
2010-09-20 22:08:53 +02:00
|
|
|
* src/port/dirmod.c
|
2003-11-12 00:52:45 +01:00
|
|
|
*
|
|
|
|
*-------------------------------------------------------------------------
|
2003-04-24 18:40:17 +02:00
|
|
|
*/
|
2003-08-04 02:43:34 +02:00
|
|
|
|
2004-02-02 23:20:33 +01:00
|
|
|
#ifndef FRONTEND
|
2003-05-15 18:35:30 +02:00
|
|
|
#include "postgres.h"
|
2004-02-02 23:20:33 +01:00
|
|
|
#else
|
|
|
|
#include "postgres_fe.h"
|
|
|
|
#endif
|
2004-08-01 08:19:26 +02:00
|
|
|
|
2004-09-10 11:53:08 +02:00
|
|
|
/* Don't modify declarations in system headers */
|
|
|
|
#if defined(WIN32) || defined(__CYGWIN__)
|
|
|
|
#undef rename
|
|
|
|
#undef unlink
|
|
|
|
#endif
|
|
|
|
|
2004-08-01 08:19:26 +02:00
|
|
|
#include <unistd.h>
|
|
|
|
#include <sys/stat.h>
|
|
|
|
|
|
|
|
#if defined(WIN32) || defined(__CYGWIN__)
|
2004-09-10 04:49:37 +02:00
|
|
|
#ifndef __CYGWIN__
|
2004-08-29 04:58:50 +02:00
|
|
|
#include <winioctl.h>
|
|
|
|
#else
|
2017-02-26 00:34:09 +01:00
|
|
|
#include <windows.h>
|
2004-08-29 04:58:50 +02:00
|
|
|
#include <w32api/winioctl.h>
|
|
|
|
#endif
|
2004-10-29 00:09:31 +02:00
|
|
|
#endif
|
|
|
|
|
|
|
|
#if defined(WIN32) || defined(__CYGWIN__)
|
2004-08-08 08:44:36 +02:00
|
|
|
|
2004-08-07 23:48:09 +02:00
|
|
|
/*
|
|
|
|
* pgrename
|
|
|
|
*/
|
2003-07-27 19:10:07 +02:00
|
|
|
int
|
|
|
|
pgrename(const char *from, const char *to)
|
2003-04-22 04:18:48 +02:00
|
|
|
{
|
|
|
|
int loops = 0;
|
|
|
|
|
2005-08-10 21:52:37 +02:00
|
|
|
/*
|
2006-11-08 21:12:05 +01:00
|
|
|
* We need to loop because even though PostgreSQL uses flags that allow
|
2005-08-10 21:52:37 +02:00
|
|
|
* rename while the file is open, other applications might have the file
|
2006-11-08 21:12:05 +01:00
|
|
|
* open without those flags. However, we won't wait indefinitely for
|
Don't error out if recycling or removing an old WAL segment fails at the end
of checkpoint. Although the checkpoint has been written to WAL at that point
already, so that all data is safe, and we'll retry removing the WAL segment at
the next checkpoint, if such a failure persists we won't be able to remove any
other old WAL segments either and will eventually run out of disk space. It's
better to treat the failure as non-fatal, and move on to clean any other WAL
segment and continue with any other end-of-checkpoint cleanup.
We don't normally expect any such failures, but on Windows it can happen with
some anti-virus or backup software that lock files without FILE_SHARE_DELETE
flag.
Also, the loop in pgrename() to retry when the file is locked was broken. If a
file is locked on Windows, you get ERROR_SHARE_VIOLATION, not
ERROR_ACCESS_DENIED, at least on modern versions. Fix that, although I left
the check for ERROR_ACCESS_DENIED in there as well (presumably it was correct
in some environment), and added ERROR_LOCK_VIOLATION to be consistent with
similar checks in pgwin32_open(). Reduce the timeout on the loop from 30s to
10s, on the grounds that since it's been broken, we've effectively had a
timeout of 0s and no-one has complained, so a smaller timeout is actually
closer to the old behavior. A longer timeout would mean that if recycling a
WAL file fails because it's locked for some reason, InstallXLogFileSegment()
will hold ControlFileLock for longer, potentially blocking other backends, so
a long timeout isn't totally harmless.
While we're at it, set errno correctly in pgrename().
Backpatch to 8.2, which is the oldest version supported on Windows. The xlog.c
changes would make sense on other platforms and thus on older versions as
well, but since there's no such locking issues on other platforms, it's not
worth it.
2009-09-13 20:32:08 +02:00
|
|
|
* someone else to close the file, as the caller might be holding locks
|
|
|
|
* and blocking other backends.
|
2005-08-10 21:52:37 +02:00
|
|
|
*/
|
2004-09-09 02:59:49 +02:00
|
|
|
#if defined(WIN32) && !defined(__CYGWIN__)
|
2003-04-22 04:18:48 +02:00
|
|
|
while (!MoveFileEx(from, to, MOVEFILE_REPLACE_EXISTING))
|
|
|
|
#else
|
2006-11-08 21:12:05 +01:00
|
|
|
while (rename(from, to) < 0)
|
2003-04-22 04:18:48 +02:00
|
|
|
#endif
|
2006-11-08 21:12:05 +01:00
|
|
|
{
|
|
|
|
#if defined(WIN32) && !defined(__CYGWIN__)
|
Don't error out if recycling or removing an old WAL segment fails at the end
of checkpoint. Although the checkpoint has been written to WAL at that point
already, so that all data is safe, and we'll retry removing the WAL segment at
the next checkpoint, if such a failure persists we won't be able to remove any
other old WAL segments either and will eventually run out of disk space. It's
better to treat the failure as non-fatal, and move on to clean any other WAL
segment and continue with any other end-of-checkpoint cleanup.
We don't normally expect any such failures, but on Windows it can happen with
some anti-virus or backup software that lock files without FILE_SHARE_DELETE
flag.
Also, the loop in pgrename() to retry when the file is locked was broken. If a
file is locked on Windows, you get ERROR_SHARE_VIOLATION, not
ERROR_ACCESS_DENIED, at least on modern versions. Fix that, although I left
the check for ERROR_ACCESS_DENIED in there as well (presumably it was correct
in some environment), and added ERROR_LOCK_VIOLATION to be consistent with
similar checks in pgwin32_open(). Reduce the timeout on the loop from 30s to
10s, on the grounds that since it's been broken, we've effectively had a
timeout of 0s and no-one has complained, so a smaller timeout is actually
closer to the old behavior. A longer timeout would mean that if recycling a
WAL file fails because it's locked for some reason, InstallXLogFileSegment()
will hold ControlFileLock for longer, potentially blocking other backends, so
a long timeout isn't totally harmless.
While we're at it, set errno correctly in pgrename().
Backpatch to 8.2, which is the oldest version supported on Windows. The xlog.c
changes would make sense on other platforms and thus on older versions as
well, but since there's no such locking issues on other platforms, it's not
worth it.
2009-09-13 20:32:08 +02:00
|
|
|
DWORD err = GetLastError();
|
|
|
|
|
|
|
|
_dosmaperr(err);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Modern NT-based Windows versions return ERROR_SHARING_VIOLATION if
|
|
|
|
* another process has the file open without FILE_SHARE_DELETE.
|
|
|
|
* ERROR_LOCK_VIOLATION has also been seen with some anti-virus
|
|
|
|
* software. This used to check for just ERROR_ACCESS_DENIED, so
|
|
|
|
* presumably you can get that too with some OS versions. We don't
|
|
|
|
* expect real permission errors where we currently use rename().
|
|
|
|
*/
|
|
|
|
if (err != ERROR_ACCESS_DENIED &&
|
|
|
|
err != ERROR_SHARING_VIOLATION &&
|
|
|
|
err != ERROR_LOCK_VIOLATION)
|
|
|
|
return -1;
|
2003-04-22 04:18:48 +02:00
|
|
|
#else
|
2006-11-08 21:12:05 +01:00
|
|
|
if (errno != EACCES)
|
|
|
|
return -1;
|
Don't error out if recycling or removing an old WAL segment fails at the end
of checkpoint. Although the checkpoint has been written to WAL at that point
already, so that all data is safe, and we'll retry removing the WAL segment at
the next checkpoint, if such a failure persists we won't be able to remove any
other old WAL segments either and will eventually run out of disk space. It's
better to treat the failure as non-fatal, and move on to clean any other WAL
segment and continue with any other end-of-checkpoint cleanup.
We don't normally expect any such failures, but on Windows it can happen with
some anti-virus or backup software that lock files without FILE_SHARE_DELETE
flag.
Also, the loop in pgrename() to retry when the file is locked was broken. If a
file is locked on Windows, you get ERROR_SHARE_VIOLATION, not
ERROR_ACCESS_DENIED, at least on modern versions. Fix that, although I left
the check for ERROR_ACCESS_DENIED in there as well (presumably it was correct
in some environment), and added ERROR_LOCK_VIOLATION to be consistent with
similar checks in pgwin32_open(). Reduce the timeout on the loop from 30s to
10s, on the grounds that since it's been broken, we've effectively had a
timeout of 0s and no-one has complained, so a smaller timeout is actually
closer to the old behavior. A longer timeout would mean that if recycling a
WAL file fails because it's locked for some reason, InstallXLogFileSegment()
will hold ControlFileLock for longer, potentially blocking other backends, so
a long timeout isn't totally harmless.
While we're at it, set errno correctly in pgrename().
Backpatch to 8.2, which is the oldest version supported on Windows. The xlog.c
changes would make sense on other platforms and thus on older versions as
well, but since there's no such locking issues on other platforms, it's not
worth it.
2009-09-13 20:32:08 +02:00
|
|
|
#endif
|
|
|
|
|
|
|
|
if (++loops > 100) /* time out after 10 sec */
|
2006-11-08 21:12:05 +01:00
|
|
|
return -1;
|
|
|
|
pg_usleep(100000); /* us */
|
|
|
|
}
|
2003-04-22 04:18:48 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2004-08-07 23:48:09 +02:00
|
|
|
/*
|
|
|
|
* pgunlink
|
|
|
|
*/
|
2003-07-27 19:10:07 +02:00
|
|
|
int
|
|
|
|
pgunlink(const char *path)
|
2003-04-22 04:18:48 +02:00
|
|
|
{
|
|
|
|
int loops = 0;
|
|
|
|
|
2005-08-10 21:52:37 +02:00
|
|
|
/*
|
2006-11-08 21:12:05 +01:00
|
|
|
* We need to loop because even though PostgreSQL uses flags that allow
|
2005-08-10 21:52:37 +02:00
|
|
|
* unlink while the file is open, other applications might have the file
|
2006-11-08 21:12:05 +01:00
|
|
|
* open without those flags. However, we won't wait indefinitely for
|
Don't error out if recycling or removing an old WAL segment fails at the end
of checkpoint. Although the checkpoint has been written to WAL at that point
already, so that all data is safe, and we'll retry removing the WAL segment at
the next checkpoint, if such a failure persists we won't be able to remove any
other old WAL segments either and will eventually run out of disk space. It's
better to treat the failure as non-fatal, and move on to clean any other WAL
segment and continue with any other end-of-checkpoint cleanup.
We don't normally expect any such failures, but on Windows it can happen with
some anti-virus or backup software that lock files without FILE_SHARE_DELETE
flag.
Also, the loop in pgrename() to retry when the file is locked was broken. If a
file is locked on Windows, you get ERROR_SHARE_VIOLATION, not
ERROR_ACCESS_DENIED, at least on modern versions. Fix that, although I left
the check for ERROR_ACCESS_DENIED in there as well (presumably it was correct
in some environment), and added ERROR_LOCK_VIOLATION to be consistent with
similar checks in pgwin32_open(). Reduce the timeout on the loop from 30s to
10s, on the grounds that since it's been broken, we've effectively had a
timeout of 0s and no-one has complained, so a smaller timeout is actually
closer to the old behavior. A longer timeout would mean that if recycling a
WAL file fails because it's locked for some reason, InstallXLogFileSegment()
will hold ControlFileLock for longer, potentially blocking other backends, so
a long timeout isn't totally harmless.
While we're at it, set errno correctly in pgrename().
Backpatch to 8.2, which is the oldest version supported on Windows. The xlog.c
changes would make sense on other platforms and thus on older versions as
well, but since there's no such locking issues on other platforms, it's not
worth it.
2009-09-13 20:32:08 +02:00
|
|
|
* someone else to close the file, as the caller might be holding locks
|
|
|
|
* and blocking other backends.
|
2005-08-10 21:52:37 +02:00
|
|
|
*/
|
2003-04-22 04:18:48 +02:00
|
|
|
while (unlink(path))
|
|
|
|
{
|
|
|
|
if (errno != EACCES)
|
|
|
|
return -1;
|
Don't error out if recycling or removing an old WAL segment fails at the end
of checkpoint. Although the checkpoint has been written to WAL at that point
already, so that all data is safe, and we'll retry removing the WAL segment at
the next checkpoint, if such a failure persists we won't be able to remove any
other old WAL segments either and will eventually run out of disk space. It's
better to treat the failure as non-fatal, and move on to clean any other WAL
segment and continue with any other end-of-checkpoint cleanup.
We don't normally expect any such failures, but on Windows it can happen with
some anti-virus or backup software that lock files without FILE_SHARE_DELETE
flag.
Also, the loop in pgrename() to retry when the file is locked was broken. If a
file is locked on Windows, you get ERROR_SHARE_VIOLATION, not
ERROR_ACCESS_DENIED, at least on modern versions. Fix that, although I left
the check for ERROR_ACCESS_DENIED in there as well (presumably it was correct
in some environment), and added ERROR_LOCK_VIOLATION to be consistent with
similar checks in pgwin32_open(). Reduce the timeout on the loop from 30s to
10s, on the grounds that since it's been broken, we've effectively had a
timeout of 0s and no-one has complained, so a smaller timeout is actually
closer to the old behavior. A longer timeout would mean that if recycling a
WAL file fails because it's locked for some reason, InstallXLogFileSegment()
will hold ControlFileLock for longer, potentially blocking other backends, so
a long timeout isn't totally harmless.
While we're at it, set errno correctly in pgrename().
Backpatch to 8.2, which is the oldest version supported on Windows. The xlog.c
changes would make sense on other platforms and thus on older versions as
well, but since there's no such locking issues on other platforms, it's not
worth it.
2009-09-13 20:32:08 +02:00
|
|
|
if (++loops > 100) /* time out after 10 sec */
|
2006-11-08 21:12:05 +01:00
|
|
|
return -1;
|
2004-08-01 08:19:26 +02:00
|
|
|
pg_usleep(100000); /* us */
|
2003-04-22 04:18:48 +02:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-07-13 01:28:49 +02:00
|
|
|
/* We undefined these above; now redefine for possible use below */
|
|
|
|
#define rename(from, to) pgrename(from, to)
|
|
|
|
#define unlink(path) pgunlink(path)
|
|
|
|
#endif /* defined(WIN32) || defined(__CYGWIN__) */
|
|
|
|
|
2004-08-07 23:48:09 +02:00
|
|
|
|
2007-07-13 01:28:49 +02:00
|
|
|
#if defined(WIN32) && !defined(__CYGWIN__) /* Cygwin has its own symlinks */
|
2004-10-29 00:09:31 +02:00
|
|
|
|
2004-08-07 23:48:09 +02:00
|
|
|
/*
|
|
|
|
* pgsymlink support:
|
|
|
|
*
|
|
|
|
* This struct is a replacement for REPARSE_DATA_BUFFER which is defined in VC6 winnt.h
|
|
|
|
* but omitted in later SDK functions.
|
|
|
|
* We only need the SymbolicLinkReparseBuffer part of the original struct's union.
|
|
|
|
*/
|
|
|
|
typedef struct
|
|
|
|
{
|
|
|
|
DWORD ReparseTag;
|
|
|
|
WORD ReparseDataLength;
|
|
|
|
WORD Reserved;
|
|
|
|
/* SymbolicLinkReparseBuffer */
|
|
|
|
WORD SubstituteNameOffset;
|
|
|
|
WORD SubstituteNameLength;
|
|
|
|
WORD PrintNameOffset;
|
|
|
|
WORD PrintNameLength;
|
2015-02-21 22:49:28 +01:00
|
|
|
WCHAR PathBuffer[FLEXIBLE_ARRAY_MEMBER];
|
2004-10-12 00:50:48 +02:00
|
|
|
} REPARSE_JUNCTION_DATA_BUFFER;
|
2004-08-07 23:48:09 +02:00
|
|
|
|
|
|
|
#define REPARSE_JUNCTION_DATA_BUFFER_HEADER_SIZE \
|
|
|
|
FIELD_OFFSET(REPARSE_JUNCTION_DATA_BUFFER, SubstituteNameOffset)
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* pgsymlink - uses Win32 junction points
|
|
|
|
*
|
2010-04-02 17:21:20 +02:00
|
|
|
* For reference: http://www.codeproject.com/KB/winsdk/junctionpoints.aspx
|
2004-08-07 23:48:09 +02:00
|
|
|
*/
|
|
|
|
int
|
|
|
|
pgsymlink(const char *oldpath, const char *newpath)
|
|
|
|
{
|
|
|
|
HANDLE dirhandle;
|
|
|
|
DWORD len;
|
2015-02-21 22:49:28 +01:00
|
|
|
char buffer[MAX_PATH * sizeof(WCHAR) + offsetof(REPARSE_JUNCTION_DATA_BUFFER, PathBuffer)];
|
2004-08-07 23:48:09 +02:00
|
|
|
char nativeTarget[MAX_PATH];
|
2004-08-08 03:31:15 +02:00
|
|
|
char *p = nativeTarget;
|
2004-08-07 23:48:09 +02:00
|
|
|
REPARSE_JUNCTION_DATA_BUFFER *reparseBuf = (REPARSE_JUNCTION_DATA_BUFFER *) buffer;
|
2004-08-29 07:07:03 +02:00
|
|
|
|
2004-08-07 23:48:09 +02:00
|
|
|
CreateDirectory(newpath, 0);
|
|
|
|
dirhandle = CreateFile(newpath, GENERIC_READ | GENERIC_WRITE,
|
|
|
|
0, 0, OPEN_EXISTING,
|
|
|
|
FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS, 0);
|
2004-08-29 07:07:03 +02:00
|
|
|
|
2004-08-07 23:48:09 +02:00
|
|
|
if (dirhandle == INVALID_HANDLE_VALUE)
|
|
|
|
return -1;
|
2004-08-29 07:07:03 +02:00
|
|
|
|
2004-08-07 23:48:09 +02:00
|
|
|
/* make sure we have an unparsed native win32 path */
|
2015-02-21 22:49:28 +01:00
|
|
|
if (memcmp("\\??\\", oldpath, 4) != 0)
|
|
|
|
snprintf(nativeTarget, sizeof(nativeTarget), "\\??\\%s", oldpath);
|
2004-08-07 23:48:09 +02:00
|
|
|
else
|
2015-02-21 22:49:28 +01:00
|
|
|
strlcpy(nativeTarget, oldpath, sizeof(nativeTarget));
|
2004-08-29 07:07:03 +02:00
|
|
|
|
2010-10-29 21:51:52 +02:00
|
|
|
while ((p = strchr(p, '/')) != NULL)
|
2004-08-07 23:48:09 +02:00
|
|
|
*p++ = '\\';
|
|
|
|
|
|
|
|
len = strlen(nativeTarget) * sizeof(WCHAR);
|
|
|
|
reparseBuf->ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
|
|
|
|
reparseBuf->ReparseDataLength = len + 12;
|
|
|
|
reparseBuf->Reserved = 0;
|
|
|
|
reparseBuf->SubstituteNameOffset = 0;
|
|
|
|
reparseBuf->SubstituteNameLength = len;
|
|
|
|
reparseBuf->PrintNameOffset = len + sizeof(WCHAR);
|
|
|
|
reparseBuf->PrintNameLength = 0;
|
|
|
|
MultiByteToWideChar(CP_ACP, 0, nativeTarget, -1,
|
|
|
|
reparseBuf->PathBuffer, MAX_PATH);
|
2004-08-29 07:07:03 +02:00
|
|
|
|
2004-08-07 23:48:09 +02:00
|
|
|
/*
|
|
|
|
* FSCTL_SET_REPARSE_POINT is coded differently depending on SDK version;
|
|
|
|
* we use our own definition
|
|
|
|
*/
|
|
|
|
if (!DeviceIoControl(dirhandle,
|
|
|
|
CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 41, METHOD_BUFFERED, FILE_ANY_ACCESS),
|
|
|
|
reparseBuf,
|
|
|
|
reparseBuf->ReparseDataLength + REPARSE_JUNCTION_DATA_BUFFER_HEADER_SIZE,
|
|
|
|
0, 0, &len, 0))
|
|
|
|
{
|
|
|
|
LPSTR msg;
|
|
|
|
|
|
|
|
errno = 0;
|
2016-03-29 17:54:57 +02:00
|
|
|
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
|
|
|
|
FORMAT_MESSAGE_IGNORE_INSERTS |
|
|
|
|
FORMAT_MESSAGE_FROM_SYSTEM,
|
2004-08-07 23:48:09 +02:00
|
|
|
NULL, GetLastError(),
|
2006-12-04 23:23:40 +01:00
|
|
|
MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
|
2004-08-07 23:48:09 +02:00
|
|
|
(LPSTR) &msg, 0, NULL);
|
2004-08-08 07:04:41 +02:00
|
|
|
#ifndef FRONTEND
|
2004-10-29 00:09:31 +02:00
|
|
|
ereport(ERROR,
|
|
|
|
(errcode_for_file_access(),
|
2005-08-02 17:14:47 +02:00
|
|
|
errmsg("could not set junction for \"%s\": %s",
|
2004-10-29 00:09:31 +02:00
|
|
|
nativeTarget, msg)));
|
2004-08-08 07:04:41 +02:00
|
|
|
#else
|
2005-08-02 17:14:47 +02:00
|
|
|
fprintf(stderr, _("could not set junction for \"%s\": %s\n"),
|
2004-10-29 00:09:31 +02:00
|
|
|
nativeTarget, msg);
|
2004-08-08 03:31:15 +02:00
|
|
|
#endif
|
2004-08-07 23:48:09 +02:00
|
|
|
LocalFree(msg);
|
2004-08-29 07:07:03 +02:00
|
|
|
|
2004-08-07 23:48:09 +02:00
|
|
|
CloseHandle(dirhandle);
|
|
|
|
RemoveDirectory(newpath);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
CloseHandle(dirhandle);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2011-01-09 15:06:55 +01:00
|
|
|
|
|
|
|
/*
|
|
|
|
* pgreadlink - uses Win32 junction points
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
pgreadlink(const char *path, char *buf, size_t size)
|
|
|
|
{
|
|
|
|
DWORD attr;
|
|
|
|
HANDLE h;
|
2015-02-21 22:49:28 +01:00
|
|
|
char buffer[MAX_PATH * sizeof(WCHAR) + offsetof(REPARSE_JUNCTION_DATA_BUFFER, PathBuffer)];
|
2011-01-09 15:06:55 +01:00
|
|
|
REPARSE_JUNCTION_DATA_BUFFER *reparseBuf = (REPARSE_JUNCTION_DATA_BUFFER *) buffer;
|
|
|
|
DWORD len;
|
|
|
|
int r;
|
|
|
|
|
|
|
|
attr = GetFileAttributes(path);
|
|
|
|
if (attr == INVALID_FILE_ATTRIBUTES)
|
|
|
|
{
|
|
|
|
_dosmaperr(GetLastError());
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if ((attr & FILE_ATTRIBUTE_REPARSE_POINT) == 0)
|
|
|
|
{
|
|
|
|
errno = EINVAL;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
h = CreateFile(path,
|
|
|
|
GENERIC_READ,
|
|
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE,
|
|
|
|
NULL,
|
|
|
|
OPEN_EXISTING,
|
|
|
|
FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS,
|
|
|
|
0);
|
|
|
|
if (h == INVALID_HANDLE_VALUE)
|
|
|
|
{
|
|
|
|
_dosmaperr(GetLastError());
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!DeviceIoControl(h,
|
|
|
|
FSCTL_GET_REPARSE_POINT,
|
|
|
|
NULL,
|
|
|
|
0,
|
|
|
|
(LPVOID) reparseBuf,
|
|
|
|
sizeof(buffer),
|
|
|
|
&len,
|
|
|
|
NULL))
|
|
|
|
{
|
|
|
|
LPSTR msg;
|
|
|
|
|
|
|
|
errno = 0;
|
2016-03-29 17:54:57 +02:00
|
|
|
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
|
|
|
|
FORMAT_MESSAGE_IGNORE_INSERTS |
|
|
|
|
FORMAT_MESSAGE_FROM_SYSTEM,
|
2011-01-09 15:06:55 +01:00
|
|
|
NULL, GetLastError(),
|
|
|
|
MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
|
|
|
|
(LPSTR) &msg, 0, NULL);
|
|
|
|
#ifndef FRONTEND
|
|
|
|
ereport(ERROR,
|
|
|
|
(errcode_for_file_access(),
|
|
|
|
errmsg("could not get junction for \"%s\": %s",
|
|
|
|
path, msg)));
|
|
|
|
#else
|
|
|
|
fprintf(stderr, _("could not get junction for \"%s\": %s\n"),
|
|
|
|
path, msg);
|
|
|
|
#endif
|
|
|
|
LocalFree(msg);
|
|
|
|
CloseHandle(h);
|
|
|
|
errno = EINVAL;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
CloseHandle(h);
|
|
|
|
|
|
|
|
/* Got it, let's get some results from this */
|
|
|
|
if (reparseBuf->ReparseTag != IO_REPARSE_TAG_MOUNT_POINT)
|
|
|
|
{
|
|
|
|
errno = EINVAL;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
r = WideCharToMultiByte(CP_ACP, 0,
|
|
|
|
reparseBuf->PathBuffer, -1,
|
|
|
|
buf,
|
|
|
|
size,
|
|
|
|
NULL, NULL);
|
|
|
|
|
|
|
|
if (r <= 0)
|
|
|
|
{
|
|
|
|
errno = EINVAL;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the path starts with "\??\", which it will do in most (all?) cases,
|
|
|
|
* strip those out.
|
|
|
|
*/
|
|
|
|
if (r > 4 && strncmp(buf, "\\??\\", 4) == 0)
|
|
|
|
{
|
|
|
|
memmove(buf, buf + 4, strlen(buf + 4) + 1);
|
|
|
|
r -= 4;
|
|
|
|
}
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Assumes the file exists, so will return false if it doesn't
|
2016-11-05 16:14:10 +01:00
|
|
|
* (since a nonexistent file is not a junction)
|
2011-01-09 15:06:55 +01:00
|
|
|
*/
|
|
|
|
bool
|
2016-11-05 16:14:10 +01:00
|
|
|
pgwin32_is_junction(const char *path)
|
2011-01-09 15:06:55 +01:00
|
|
|
{
|
|
|
|
DWORD attr = GetFileAttributes(path);
|
|
|
|
|
|
|
|
if (attr == INVALID_FILE_ATTRIBUTES)
|
|
|
|
{
|
|
|
|
_dosmaperr(GetLastError());
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
return ((attr & FILE_ATTRIBUTE_REPARSE_POINT) == FILE_ATTRIBUTE_REPARSE_POINT);
|
|
|
|
}
|
2007-07-13 01:28:49 +02:00
|
|
|
#endif /* defined(WIN32) && !defined(__CYGWIN__) */
|