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/*-------------------------------------------------------------------------
*
* win32stat.c
* Replacements for <sys/stat.h> functions using GetFileInformationByHandle
*
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/port/win32stat.c
*
*-------------------------------------------------------------------------
*/
#ifdef WIN32
#include "c.h"
#include <windows.h>
/*
* Convert a FILETIME struct into a 64 bit time_t.
*/
static __time64_t
filetime_to_time(const FILETIME *ft)
{
ULARGE_INTEGER unified_ft = {0};
static const uint64 EpochShift = UINT64CONST(116444736000000000);
unified_ft.LowPart = ft->dwLowDateTime;
unified_ft.HighPart = ft->dwHighDateTime;
if (unified_ft.QuadPart < EpochShift)
return -1;
unified_ft.QuadPart -= EpochShift;
unified_ft.QuadPart /= 10 * 1000 * 1000;
return unified_ft.QuadPart;
}
/*
* Convert WIN32 file attributes to a Unix-style mode.
*
* Only owner permissions are set.
*/
static unsigned short
fileattr_to_unixmode(int attr)
{
unsigned short uxmode = 0;
uxmode |= (unsigned short) ((attr & FILE_ATTRIBUTE_DIRECTORY) ?
(_S_IFDIR) : (_S_IFREG));
uxmode |= (unsigned short) ((attr & FILE_ATTRIBUTE_READONLY) ?
(_S_IREAD) : (_S_IREAD | _S_IWRITE));
/* there is no need to simulate _S_IEXEC using CMD's PATHEXT extensions */
uxmode |= _S_IEXEC;
return uxmode;
}
/*
* Convert WIN32 file information (from a HANDLE) to a struct stat.
*/
static int
fileinfo_to_stat(HANDLE hFile, struct stat *buf)
{
BY_HANDLE_FILE_INFORMATION fiData;
memset(buf, 0, sizeof(*buf));
/*
* GetFileInformationByHandle minimum supported version: Windows XP and
* Windows Server 2003, so it exists everywhere we care about.
*/
if (!GetFileInformationByHandle(hFile, &fiData))
{
_dosmaperr(GetLastError());
return -1;
}
if (fiData.ftLastWriteTime.dwLowDateTime ||
fiData.ftLastWriteTime.dwHighDateTime)
buf->st_mtime = filetime_to_time(&fiData.ftLastWriteTime);
if (fiData.ftLastAccessTime.dwLowDateTime ||
fiData.ftLastAccessTime.dwHighDateTime)
buf->st_atime = filetime_to_time(&fiData.ftLastAccessTime);
else
buf->st_atime = buf->st_mtime;
if (fiData.ftCreationTime.dwLowDateTime ||
fiData.ftCreationTime.dwHighDateTime)
buf->st_ctime = filetime_to_time(&fiData.ftCreationTime);
else
buf->st_ctime = buf->st_mtime;
buf->st_mode = fileattr_to_unixmode(fiData.dwFileAttributes);
buf->st_nlink = fiData.nNumberOfLinks;
buf->st_size = ((((uint64) fiData.nFileSizeHigh) << 32) |
fiData.nFileSizeLow);
return 0;
}
/*
* Windows implementation of stat().
*
* This currently also implements lstat(), though perhaps that should change.
*/
int
_pgstat64(const char *name, struct stat *buf)
{
/*
* Our open wrapper will report STATUS_DELETE_PENDING as ENOENT. We
* request FILE_FLAG_BACKUP_SEMANTICS so that we can open directories too,
* for limited purposes. We use the private handle-based version, so we
* don't risk running out of fds.
*/
HANDLE hFile;
int ret;
hFile = pgwin32_open_handle(name, O_RDONLY, true);
if (hFile == INVALID_HANDLE_VALUE)
return -1;
ret = fileinfo_to_stat(hFile, buf);
CloseHandle(hFile);
return ret;
}
/*
* Windows implementation of fstat().
*/
int
_pgfstat64(int fileno, struct stat *buf)
{
HANDLE hFile = (HANDLE) _get_osfhandle(fileno);
DWORD fileType = FILE_TYPE_UNKNOWN;
unsigned short st_mode;
if (buf == NULL)
{
errno = EINVAL;
return -1;
}
fileType = pgwin32_get_file_type(hFile);
if (errno != 0)
return -1;
switch (fileType)
{
/* The specified file is a disk file */
case FILE_TYPE_DISK:
return fileinfo_to_stat(hFile, buf);
/*
* The specified file is a socket, a named pipe, or an anonymous
* pipe.
*/
case FILE_TYPE_PIPE:
st_mode = _S_IFIFO;
break;
/* The specified file is a character file */
case FILE_TYPE_CHAR:
st_mode = _S_IFCHR;
break;
/* Unused flag and unknown file type */
case FILE_TYPE_REMOTE:
case FILE_TYPE_UNKNOWN:
default:
errno = EINVAL;
return -1;
}
memset(buf, 0, sizeof(*buf));
buf->st_mode = st_mode;
buf->st_dev = fileno;
buf->st_rdev = fileno;
buf->st_nlink = 1;
return 0;
}
#endif /* WIN32 */
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