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/*
** 2004 May 22
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains code that is specific to windows.
*/
#include "sqliteInt.h"
#include "os.h"
#if OS_WIN /* This file is used for windows only */
#include <winbase.h>
#ifdef __CYGWIN__
# include <sys/cygwin.h>
#endif
/*
** Macros used to determine whether or not to use threads.
*/
#if defined(THREADSAFE) && THREADSAFE
# define SQLITE_W32_THREADS 1
#endif
/*
** Include code that is common to all os_*.c files
*/
#include "os_common.h"
/*
** Do not include any of the File I/O interface procedures if the
** SQLITE_OMIT_DISKIO macro is defined (indicating that there database
** will be in-memory only)
*/
#ifndef SQLITE_OMIT_DISKIO
/*
** Delete the named file
*/
int sqlite3OsDelete(const char *zFilename){
DeleteFileA(zFilename);
TRACE2("DELETE \"%s\"\n", zFilename);
return SQLITE_OK;
}
/*
** Return TRUE if the named file exists.
*/
int sqlite3OsFileExists(const char *zFilename){
return GetFileAttributesA(zFilename) != 0xffffffff;
}
/*
** Attempt to open a file for both reading and writing. If that
** fails, try opening it read-only. If the file does not exist,
** try to create it.
**
** On success, a handle for the open file is written to *id
** and *pReadonly is set to 0 if the file was opened for reading and
** writing or 1 if the file was opened read-only. The function returns
** SQLITE_OK.
**
** On failure, the function returns SQLITE_CANTOPEN and leaves
** *id and *pReadonly unchanged.
*/
int sqlite3OsOpenReadWrite(
const char *zFilename,
OsFile *id,
int *pReadonly
){
HANDLE h;
assert( !id->isOpen );
h = CreateFileA(zFilename,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS,
NULL
);
if( h==INVALID_HANDLE_VALUE ){
h = CreateFileA(zFilename,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS,
NULL
);
if( h==INVALID_HANDLE_VALUE ){
return SQLITE_CANTOPEN;
}
*pReadonly = 1;
}else{
*pReadonly = 0;
}
id->h = h;
id->locktype = NO_LOCK;
id->sharedLockByte = 0;
id->isOpen = 1;
OpenCounter(+1);
TRACE3("OPEN R/W %d \"%s\"\n", h, zFilename);
return SQLITE_OK;
}
/*
** Attempt to open a new file for exclusive access by this process.
** The file will be opened for both reading and writing. To avoid
** a potential security problem, we do not allow the file to have
** previously existed. Nor do we allow the file to be a symbolic
** link.
**
** If delFlag is true, then make arrangements to automatically delete
** the file when it is closed.
**
** On success, write the file handle into *id and return SQLITE_OK.
**
** On failure, return SQLITE_CANTOPEN.
*/
int sqlite3OsOpenExclusive(const char *zFilename, OsFile *id, int delFlag){
HANDLE h;
int fileflags;
assert( !id->isOpen );
if( delFlag ){
fileflags = FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_RANDOM_ACCESS
| FILE_FLAG_DELETE_ON_CLOSE;
}else{
fileflags = FILE_FLAG_RANDOM_ACCESS;
}
h = CreateFileA(zFilename,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
fileflags,
NULL
);
if( h==INVALID_HANDLE_VALUE ){
return SQLITE_CANTOPEN;
}
id->h = h;
id->locktype = NO_LOCK;
id->sharedLockByte = 0;
id->isOpen = 1;
OpenCounter(+1);
TRACE3("OPEN EX %d \"%s\"\n", h, zFilename);
return SQLITE_OK;
}
/*
** Attempt to open a new file for read-only access.
**
** On success, write the file handle into *id and return SQLITE_OK.
**
** On failure, return SQLITE_CANTOPEN.
*/
int sqlite3OsOpenReadOnly(const char *zFilename, OsFile *id){
HANDLE h;
assert( !id->isOpen );
h = CreateFileA(zFilename,
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS,
NULL
);
if( h==INVALID_HANDLE_VALUE ){
return SQLITE_CANTOPEN;
}
id->h = h;
id->locktype = NO_LOCK;
id->sharedLockByte = 0;
id->isOpen = 1;
OpenCounter(+1);
TRACE3("OPEN RO %d \"%s\"\n", h, zFilename);
return SQLITE_OK;
}
/*
** Attempt to open a file descriptor for the directory that contains a
** file. This file descriptor can be used to fsync() the directory
** in order to make sure the creation of a new file is actually written
** to disk.
**
** This routine is only meaningful for Unix. It is a no-op under
** windows since windows does not support hard links.
**
** On success, a handle for a previously open file is at *id is
** updated with the new directory file descriptor and SQLITE_OK is
** returned.
**
** On failure, the function returns SQLITE_CANTOPEN and leaves
** *id unchanged.
*/
int sqlite3OsOpenDirectory(
const char *zDirname,
OsFile *id
){
return SQLITE_OK;
}
/*
** If the following global variable points to a string which is the
** name of a directory, then that directory will be used to store
** temporary files.
*/
char *sqlite3_temp_directory = 0;
/*
** Create a temporary file name in zBuf. zBuf must be big enough to
** hold at least SQLITE_TEMPNAME_SIZE characters.
*/
int sqlite3OsTempFileName(char *zBuf){
static char zChars[] =
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789";
int i, j;
char zTempPath[SQLITE_TEMPNAME_SIZE];
if( sqlite3_temp_directory ){
strncpy(zTempPath, sqlite3_temp_directory, SQLITE_TEMPNAME_SIZE-30);
zTempPath[SQLITE_TEMPNAME_SIZE-30] = 0;
}else{
GetTempPathA(SQLITE_TEMPNAME_SIZE-30, zTempPath);
}
for(i=strlen(zTempPath); i>0 && zTempPath[i-1]=='\\'; i--){}
zTempPath[i] = 0;
for(;;){
sprintf(zBuf, "%s\\"TEMP_FILE_PREFIX, zTempPath);
j = strlen(zBuf);
sqlite3Randomness(15, &zBuf[j]);
for(i=0; i<15; i++, j++){
zBuf[j] = (char)zChars[ ((unsigned char)zBuf[j])%(sizeof(zChars)-1) ];
}
zBuf[j] = 0;
if( !sqlite3OsFileExists(zBuf) ) break;
}
TRACE2("TEMP FILENAME: %s\n", zBuf);
return SQLITE_OK;
}
/*
** Close a file.
*/
int sqlite3OsClose(OsFile *id){
if( id->isOpen ){
TRACE2("CLOSE %d\n", id->h);
CloseHandle(id->h);
OpenCounter(-1);
id->isOpen = 0;
}
return SQLITE_OK;
}
/*
** Read data from a file into a buffer. Return SQLITE_OK if all
** bytes were read successfully and SQLITE_IOERR if anything goes
** wrong.
*/
int sqlite3OsRead(OsFile *id, void *pBuf, int amt){
DWORD got;
assert( id->isOpen );
SimulateIOError(SQLITE_IOERR);
TRACE3("READ %d lock=%d\n", id->h, id->locktype);
if( !ReadFile(id->h, pBuf, amt, &got, 0) ){
got = 0;
}
if( got==(DWORD)amt ){
return SQLITE_OK;
}else{
return SQLITE_IOERR;
}
}
/*
** Write data from a buffer into a file. Return SQLITE_OK on success
** or some other error code on failure.
*/
int sqlite3OsWrite(OsFile *id, const void *pBuf, int amt){
int rc = 0;
DWORD wrote;
assert( id->isOpen );
SimulateIOError(SQLITE_IOERR);
SimulateDiskfullError;
TRACE3("WRITE %d lock=%d\n", id->h, id->locktype);
assert( amt>0 );
while( amt>0 && (rc = WriteFile(id->h, pBuf, amt, &wrote, 0))!=0 && wrote>0 ){
amt -= wrote;
pBuf = &((char*)pBuf)[wrote];
}
if( !rc || amt>(int)wrote ){
return SQLITE_FULL;
}
return SQLITE_OK;
}
/*
** Move the read/write pointer in a file.
*/
int sqlite3OsSeek(OsFile *id, i64 offset){
LONG upperBits = offset>>32;
LONG lowerBits = offset & 0xffffffff;
DWORD rc;
assert( id->isOpen );
SEEK(offset/1024 + 1);
rc = SetFilePointer(id->h, lowerBits, &upperBits, FILE_BEGIN);
TRACE3("SEEK %d %lld\n", id->h, offset);
return SQLITE_OK;
}
/*
** Make sure all writes to a particular file are committed to disk.
*/
int sqlite3OsSync(OsFile *id){
assert( id->isOpen );
TRACE3("SYNC %d lock=%d\n", id->h, id->locktype);
if( FlushFileBuffers(id->h) ){
return SQLITE_OK;
}else{
return SQLITE_IOERR;
}
}
/*
** Sync the directory zDirname. This is a no-op on operating systems other
** than UNIX.
*/
int sqlite3OsSyncDirectory(const char *zDirname){
SimulateIOError(SQLITE_IOERR);
return SQLITE_OK;
}
/*
** Truncate an open file to a specified size
*/
int sqlite3OsTruncate(OsFile *id, i64 nByte){
LONG upperBits = nByte>>32;
assert( id->isOpen );
TRACE3("TRUNCATE %d %lld\n", id->h, nByte);
SimulateIOError(SQLITE_IOERR);
SetFilePointer(id->h, nByte, &upperBits, FILE_BEGIN);
SetEndOfFile(id->h);
return SQLITE_OK;
}
/*
** Determine the current size of a file in bytes
*/
int sqlite3OsFileSize(OsFile *id, i64 *pSize){
DWORD upperBits, lowerBits;
assert( id->isOpen );
SimulateIOError(SQLITE_IOERR);
lowerBits = GetFileSize(id->h, &upperBits);
*pSize = (((i64)upperBits)<<32) + lowerBits;
return SQLITE_OK;
}
/*
** Return true (non-zero) if we are running under WinNT, Win2K or WinXP.
** Return false (zero) for Win95, Win98, or WinME.
**
** Here is an interesting observation: Win95, Win98, and WinME lack
** the LockFileEx() API. But we can still statically link against that
** API as long as we don't call it win running Win95/98/ME. A call to
** this routine is used to determine if the host is Win95/98/ME or
** WinNT/2K/XP so that we will know whether or not we can safely call
** the LockFileEx() API.
*/
static int isNT(void){
static int osType = 0; /* 0=unknown 1=win95 2=winNT */
if( osType==0 ){
OSVERSIONINFO sInfo;
sInfo.dwOSVersionInfoSize = sizeof(sInfo);
GetVersionEx(&sInfo);
osType = sInfo.dwPlatformId==VER_PLATFORM_WIN32_NT ? 2 : 1;
}
return osType==2;
}
/*
** Acquire a reader lock.
** Different API routines are called depending on whether or not this
** is Win95 or WinNT.
*/
static int getReadLock(OsFile *id){
int res;
if( isNT() ){
OVERLAPPED ovlp;
ovlp.Offset = SHARED_FIRST;
ovlp.OffsetHigh = 0;
ovlp.hEvent = 0;
res = LockFileEx(id->h, LOCKFILE_FAIL_IMMEDIATELY, 0, SHARED_SIZE,0,&ovlp);
}else{
int lk;
sqlite3Randomness(sizeof(lk), &lk);
id->sharedLockByte = (lk & 0x7fffffff)%(SHARED_SIZE - 1);
res = LockFile(id->h, SHARED_FIRST+id->sharedLockByte, 0, 1, 0);
}
return res;
}
/*
** Undo a readlock
*/
static int unlockReadLock(OsFile *id){
int res;
if( isNT() ){
res = UnlockFile(id->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
}else{
res = UnlockFile(id->h, SHARED_FIRST + id->sharedLockByte, 0, 1, 0);
}
return res;
}
#ifndef SQLITE_OMIT_PAGER_PRAGMAS
/*
** Check that a given pathname is a directory and is writable
**
*/
int sqlite3OsIsDirWritable(char *zBuf){
int fileAttr;
if(! zBuf ) return 0;
if(! isNT() && strlen(zBuf) > MAX_PATH ) return 0;
fileAttr = GetFileAttributesA(zBuf);
if( fileAttr == 0xffffffff ) return 0;
if( (fileAttr & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY ){
return 0;
}
return 1;
}
#endif /* SQLITE_OMIT_PAGER_PRAGMAS */
/*
** Lock the file with the lock specified by parameter locktype - one
** of the following:
**
** (1) SHARED_LOCK
** (2) RESERVED_LOCK
** (3) PENDING_LOCK
** (4) EXCLUSIVE_LOCK
**
** Sometimes when requesting one lock state, additional lock states
** are inserted in between. The locking might fail on one of the later
** transitions leaving the lock state different from what it started but
** still short of its goal. The following chart shows the allowed
** transitions and the inserted intermediate states:
**
** UNLOCKED -> SHARED
** SHARED -> RESERVED
** SHARED -> (PENDING) -> EXCLUSIVE
** RESERVED -> (PENDING) -> EXCLUSIVE
** PENDING -> EXCLUSIVE
**
** This routine will only increase a lock. The sqlite3OsUnlock() routine
** erases all locks at once and returns us immediately to locking level 0.
** It is not possible to lower the locking level one step at a time. You
** must go straight to locking level 0.
*/
int sqlite3OsLock(OsFile *id, int locktype){
int rc = SQLITE_OK; /* Return code from subroutines */
int res = 1; /* Result of a windows lock call */
int newLocktype; /* Set id->locktype to this value before exiting */
int gotPendingLock = 0;/* True if we acquired a PENDING lock this time */
assert( id->isOpen );
TRACE5("LOCK %d %d was %d(%d)\n",
id->h, locktype, id->locktype, id->sharedLockByte);
/* If there is already a lock of this type or more restrictive on the
** OsFile, do nothing. Don't use the end_lock: exit path, as
** sqlite3OsEnterMutex() hasn't been called yet.
*/
if( id->locktype>=locktype ){
return SQLITE_OK;
}
/* Make sure the locking sequence is correct
*/
assert( id->locktype!=NO_LOCK || locktype==SHARED_LOCK );
assert( locktype!=PENDING_LOCK );
assert( locktype!=RESERVED_LOCK || id->locktype==SHARED_LOCK );
/* Lock the PENDING_LOCK byte if we need to acquire a PENDING lock or
** a SHARED lock. If we are acquiring a SHARED lock, the acquisition of
** the PENDING_LOCK byte is temporary.
*/
newLocktype = id->locktype;
if( id->locktype==NO_LOCK
|| (locktype==EXCLUSIVE_LOCK && id->locktype==RESERVED_LOCK)
){
int cnt = 3;
while( cnt-->0 && (res = LockFile(id->h, PENDING_BYTE, 0, 1, 0))==0 ){
/* Try 3 times to get the pending lock. The pending lock might be
** held by another reader process who will release it momentarily.
*/
TRACE2("could not get a PENDING lock. cnt=%d\n", cnt);
Sleep(1);
}
gotPendingLock = res;
}
/* Acquire a shared lock
*/
if( locktype==SHARED_LOCK && res ){
assert( id->locktype==NO_LOCK );
res = getReadLock(id);
if( res ){
newLocktype = SHARED_LOCK;
}
}
/* Acquire a RESERVED lock
*/
if( locktype==RESERVED_LOCK && res ){
assert( id->locktype==SHARED_LOCK );
res = LockFile(id->h, RESERVED_BYTE, 0, 1, 0);
if( res ){
newLocktype = RESERVED_LOCK;
}
}
/* Acquire a PENDING lock
*/
if( locktype==EXCLUSIVE_LOCK && res ){
newLocktype = PENDING_LOCK;
gotPendingLock = 0;
}
/* Acquire an EXCLUSIVE lock
*/
if( locktype==EXCLUSIVE_LOCK && res ){
assert( id->locktype>=SHARED_LOCK );
res = unlockReadLock(id);
TRACE2("unreadlock = %d\n", res);
res = LockFile(id->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
if( res ){
newLocktype = EXCLUSIVE_LOCK;
}else{
TRACE2("error-code = %d\n", GetLastError());
}
}
/* If we are holding a PENDING lock that ought to be released, then
** release it now.
*/
if( gotPendingLock && locktype==SHARED_LOCK ){
UnlockFile(id->h, PENDING_BYTE, 0, 1, 0);
}
/* Update the state of the lock has held in the file descriptor then
** return the appropriate result code.
*/
if( res ){
rc = SQLITE_OK;
}else{
TRACE4("LOCK FAILED %d trying for %d but got %d\n", id->h,
locktype, newLocktype);
rc = SQLITE_BUSY;
}
id->locktype = newLocktype;
return rc;
}
/*
** This routine checks if there is a RESERVED lock held on the specified
** file by this or any other process. If such a lock is held, return
** non-zero, otherwise zero.
*/
int sqlite3OsCheckReservedLock(OsFile *id){
int rc;
assert( id->isOpen );
if( id->locktype>=RESERVED_LOCK ){
rc = 1;
TRACE3("TEST WR-LOCK %d %d (local)\n", id->h, rc);
}else{
rc = LockFile(id->h, RESERVED_BYTE, 0, 1, 0);
if( rc ){
UnlockFile(id->h, RESERVED_BYTE, 0, 1, 0);
}
rc = !rc;
TRACE3("TEST WR-LOCK %d %d (remote)\n", id->h, rc);
}
return rc;
}
/*
** Lower the locking level on file descriptor id to locktype. locktype
** must be either NO_LOCK or SHARED_LOCK.
**
** If the locking level of the file descriptor is already at or below
** the requested locking level, this routine is a no-op.
**
** It is not possible for this routine to fail if the second argument
** is NO_LOCK. If the second argument is SHARED_LOCK then this routine
** might return SQLITE_IOERR;
*/
int sqlite3OsUnlock(OsFile *id, int locktype){
int type;
int rc = SQLITE_OK;
assert( id->isOpen );
assert( locktype<=SHARED_LOCK );
TRACE5("UNLOCK %d to %d was %d(%d)\n", id->h, locktype,
id->locktype, id->sharedLockByte);
type = id->locktype;
if( type>=EXCLUSIVE_LOCK ){
UnlockFile(id->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
if( locktype==SHARED_LOCK && !getReadLock(id) ){
/* This should never happen. We should always be able to
** reacquire the read lock */
rc = SQLITE_IOERR;
}
}
if( type>=RESERVED_LOCK ){
UnlockFile(id->h, RESERVED_BYTE, 0, 1, 0);
}
if( locktype==NO_LOCK && type>=SHARED_LOCK ){
unlockReadLock(id);
}
if( type>=PENDING_LOCK ){
UnlockFile(id->h, PENDING_BYTE, 0, 1, 0);
}
id->locktype = locktype;
return rc;
}
/*
** Turn a relative pathname into a full pathname. Return a pointer
** to the full pathname stored in space obtained from sqliteMalloc().
** The calling function is responsible for freeing this space once it
** is no longer needed.
*/
char *sqlite3OsFullPathname(const char *zRelative){
char *zNotUsed;
char *zFull;
int nByte;
#ifdef __CYGWIN__
nByte = strlen(zRelative) + MAX_PATH + 1001;
zFull = sqliteMalloc( nByte );
if( zFull==0 ) return 0;
if( cygwin_conv_to_full_win32_path(zRelative, zFull) ) return 0;
#else
nByte = GetFullPathNameA(zRelative, 0, 0, &zNotUsed) + 1;
zFull = sqliteMalloc( nByte );
if( zFull==0 ) return 0;
GetFullPathNameA(zRelative, nByte, zFull, &zNotUsed);
#endif
return zFull;
}
#endif /* SQLITE_OMIT_DISKIO */
/***************************************************************************
** Everything above deals with file I/O. Everything that follows deals
** with other miscellanous aspects of the operating system interface
****************************************************************************/
/*
** Get information to seed the random number generator. The seed
** is written into the buffer zBuf[256]. The calling function must
** supply a sufficiently large buffer.
*/
int sqlite3OsRandomSeed(char *zBuf){
/* We have to initialize zBuf to prevent valgrind from reporting
** errors. The reports issued by valgrind are incorrect - we would
** prefer that the randomness be increased by making use of the
** uninitialized space in zBuf - but valgrind errors tend to worry
** some users. Rather than argue, it seems easier just to initialize
** the whole array and silence valgrind, even if that means less randomness
** in the random seed.
**
** When testing, initializing zBuf[] to zero is all we do. That means
** that we always use the same random number sequence.* This makes the
** tests repeatable.
*/
memset(zBuf, 0, 256);
GetSystemTime((LPSYSTEMTIME)zBuf);
return SQLITE_OK;
}
/*
** Sleep for a little while. Return the amount of time slept.
*/
int sqlite3OsSleep(int ms){
Sleep(ms);
return ms;
}
/*
** Static variables used for thread synchronization
*/
static int inMutex = 0;
#ifdef SQLITE_W32_THREADS
static CRITICAL_SECTION cs;
#endif
/*
** The following pair of routine implement mutual exclusion for
** multi-threaded processes. Only a single thread is allowed to
** executed code that is surrounded by EnterMutex() and LeaveMutex().
**
** SQLite uses only a single Mutex. There is not much critical
** code and what little there is executes quickly and without blocking.
*/
void sqlite3OsEnterMutex(){
#ifdef SQLITE_W32_THREADS
static int isInit = 0;
while( !isInit ){
static long lock = 0;
if( InterlockedIncrement(&lock)==1 ){
InitializeCriticalSection(&cs);
isInit = 1;
}else{
Sleep(1);
}
}
EnterCriticalSection(&cs);
#endif
assert( !inMutex );
inMutex = 1;
}
void sqlite3OsLeaveMutex(){
assert( inMutex );
inMutex = 0;
#ifdef SQLITE_W32_THREADS
LeaveCriticalSection(&cs);
#endif
}
/*
** The following variable, if set to a non-zero value, becomes the result
** returned from sqlite3OsCurrentTime(). This is used for testing.
*/
#ifdef SQLITE_TEST
int sqlite3_current_time = 0;
#endif
/*
** Find the current time (in Universal Coordinated Time). Write the
** current time and date as a Julian Day number into *prNow and
** return 0. Return 1 if the time and date cannot be found.
*/
int sqlite3OsCurrentTime(double *prNow){
FILETIME ft;
/* FILETIME structure is a 64-bit value representing the number of
100-nanosecond intervals since January 1, 1601 (= JD 2305813.5).
*/
double now;
GetSystemTimeAsFileTime( &ft );
now = ((double)ft.dwHighDateTime) * 4294967296.0;
*prNow = (now + ft.dwLowDateTime)/864000000000.0 + 2305813.5;
#ifdef SQLITE_TEST
if( sqlite3_current_time ){
*prNow = sqlite3_current_time/86400.0 + 2440587.5;
}
#endif
return 0;
}
#endif /* OS_WIN */