/*
* - file attribute setting, based on fileMode?
* - handle other flags? (eg FILE_FLAG_NO_BUFFERING/FILE_FLAG_WRITE_THROUGH)
*/
int
win32_open(const char *fileName, int fileFlags,...)
{
int fd;
HANDLE h;
SECURITY_ATTRIBUTES sa;
/* Check that we can handle the request */
assert((fileFlags & ((O_RDONLY | O_WRONLY | O_RDWR) | O_APPEND |
(O_RANDOM | O_SEQUENTIAL | O_TEMPORARY) |
_O_SHORT_LIVED | O_DSYNC |
(O_CREAT | O_TRUNC | O_EXCL) | (O_TEXT | O_BINARY))) == fileFlags);
sa.nLength = sizeof(sa);
sa.bInheritHandle = TRUE;
sa.lpSecurityDescriptor = NULL;
if ((h = CreateFile(fileName,
/* cannot use O_RDONLY, as it == 0 */
(fileFlags & O_RDWR) ? (GENERIC_WRITE | GENERIC_READ) :
((fileFlags & O_WRONLY) ? GENERIC_WRITE : GENERIC_READ),
/* These flags allow concurrent rename/unlink */
(FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE),
&sa,
openFlagsToCreateFileFlags(fileFlags),
FILE_ATTRIBUTE_NORMAL |
((fileFlags & O_RANDOM) ? FILE_FLAG_RANDOM_ACCESS : 0) |
((fileFlags & O_SEQUENTIAL) ? FILE_FLAG_SEQUENTIAL_SCAN : 0) |
((fileFlags & _O_SHORT_LIVED) ? FILE_ATTRIBUTE_TEMPORARY : 0) |
((fileFlags & O_TEMPORARY) ? FILE_FLAG_DELETE_ON_CLOSE : 0) |
((fileFlags & O_DSYNC) ? FILE_FLAG_WRITE_THROUGH : 0),
NULL)) == INVALID_HANDLE_VALUE)
{
switch (GetLastError())
{
/* EMFILE, ENFILE should not occur from CreateFile. */
case ERROR_PATH_NOT_FOUND:
case ERROR_FILE_NOT_FOUND:
errno = ENOENT;
break;
case ERROR_FILE_EXISTS:
errno = EEXIST;
break;
case ERROR_ACCESS_DENIED:
errno = EACCES;
break;
default:
errno = EINVAL;
}
return -1;
}
/* _open_osfhandle will, on error, set errno accordingly */
if ((fd = _open_osfhandle((long) h, fileFlags & O_APPEND)) < 0 ||
(fileFlags & (O_TEXT | O_BINARY) && (_setmode(fd, fileFlags & (O_TEXT | O_BINARY)) < 0)))
CloseHandle(h); /* will not affect errno */
return fd;
}
/*
* - file attribute setting, based on fileMode?
*/
int
pgwin32_open(const char *fileName, int fileFlags,...)
{
int fd;
HANDLE h = INVALID_HANDLE_VALUE;
SECURITY_ATTRIBUTES sa;
int loops = 0;
/* Check that we can handle the request */
assert((fileFlags & ((O_RDONLY | O_WRONLY | O_RDWR) | O_APPEND |
(O_RANDOM | O_SEQUENTIAL | O_TEMPORARY) |
_O_SHORT_LIVED | O_DSYNC | O_DIRECT |
(O_CREAT | O_TRUNC | O_EXCL) | (O_TEXT | O_BINARY))) == fileFlags);
sa.nLength = sizeof(sa);
sa.bInheritHandle = TRUE;
sa.lpSecurityDescriptor = NULL;
while ((h = CreateFile(fileName,
/* cannot use O_RDONLY, as it == 0 */
(fileFlags & O_RDWR) ? (GENERIC_WRITE | GENERIC_READ) :
((fileFlags & O_WRONLY) ? GENERIC_WRITE : GENERIC_READ),
/* These flags allow concurrent rename/unlink */
(FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE),
&sa,
openFlagsToCreateFileFlags(fileFlags),
FILE_ATTRIBUTE_NORMAL |
((fileFlags & O_RANDOM) ? FILE_FLAG_RANDOM_ACCESS : 0) |
((fileFlags & O_SEQUENTIAL) ? FILE_FLAG_SEQUENTIAL_SCAN : 0) |
((fileFlags & _O_SHORT_LIVED) ? FILE_ATTRIBUTE_TEMPORARY : 0) |
((fileFlags & O_TEMPORARY) ? FILE_FLAG_DELETE_ON_CLOSE : 0) |
((fileFlags & O_DIRECT) ? FILE_FLAG_NO_BUFFERING : 0) |
((fileFlags & O_DSYNC) ? FILE_FLAG_WRITE_THROUGH : 0),
NULL)) == INVALID_HANDLE_VALUE)
{
/*
* Sharing violation or locking error can indicate antivirus, backup
* or similar software that's locking the file. Try again for 30 seconds
* before giving up.
*/
DWORD err = GetLastError();
if (err == ERROR_SHARING_VIOLATION ||
err == ERROR_LOCK_VIOLATION)
{
pg_usleep(100000);
loops++;
#ifndef FRONTEND
if (loops == 50)
ereport(LOG,
(errmsg("could not open file \"%s\": %s", fileName,
(err == ERROR_SHARING_VIOLATION)?_("sharing violation"):_("lock violation")),
errdetail("Continuing to retry for 30 seconds."),
errhint("You might have antivirus, backup, or similar software interfering with the database system.")));
#endif
if (loops < 300)
continue;
}
_dosmaperr(err);
return -1;
}
/* _open_osfhandle will, on error, set errno accordingly */
if ((fd = _open_osfhandle((long) h, fileFlags & O_APPEND)) < 0)
CloseHandle(h); /* will not affect errno */
else if (fileFlags & (O_TEXT | O_BINARY) &&
_setmode(fd, fileFlags & (O_TEXT | O_BINARY)) < 0)
{
_close(fd);
return -1;
}
return fd;
}