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chromium / external / github.com / pwnall / sqlite / refs/heads/win-check-dir / . / src / os_win.c
blob: fcfe0118ed4e95424c4e8c19ecfb965390c08e4b [file] [log] [blame]
/*
** 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"
#if SQLITE_OS_WIN /* This file is used for Windows only */
#ifdef __CYGWIN__
# include <sys/cygwin.h>
#endif
/*
** Include code that is common to all os_*.c files
*/
#include "os_common.h"
/*
** Some Microsoft compilers lack this definition.
*/
#ifndef INVALID_FILE_ATTRIBUTES
# define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
#endif
/* Forward references */
typedef struct winShm winShm; /* A connection to shared-memory */
typedef struct winShmNode winShmNode; /* A region of shared-memory */
/*
** WinCE lacks native support for file locking so we have to fake it
** with some code of our own.
*/
#if SQLITE_OS_WINCE
typedef struct winceLock {
int nReaders; /* Number of reader locks obtained */
BOOL bPending; /* Indicates a pending lock has been obtained */
BOOL bReserved; /* Indicates a reserved lock has been obtained */
BOOL bExclusive; /* Indicates an exclusive lock has been obtained */
} winceLock;
#endif
/*
** The winFile structure is a subclass of sqlite3_file* specific to the win32
** portability layer.
*/
typedef struct winFile winFile;
struct winFile {
const sqlite3_io_methods *pMethod; /*** Must be first ***/
sqlite3_vfs *pVfs; /* The VFS used to open this file */
HANDLE h; /* Handle for accessing the file */
u8 locktype; /* Type of lock currently held on this file */
short sharedLockByte; /* Randomly chosen byte used as a shared lock */
u8 ctrlFlags; /* Flags. See WINFILE_* below */
DWORD lastErrno; /* The Windows errno from the last I/O error */
winShm *pShm; /* Instance of shared memory on this file */
const char *zPath; /* Full pathname of this file */
int szChunk; /* Chunk size configured by FCNTL_CHUNK_SIZE */
#if SQLITE_OS_WINCE
LPWSTR zDeleteOnClose; /* Name of file to delete when closing */
HANDLE hMutex; /* Mutex used to control access to shared lock */
HANDLE hShared; /* Shared memory segment used for locking */
winceLock local; /* Locks obtained by this instance of winFile */
winceLock *shared; /* Global shared lock memory for the file */
#endif
};
/*
** Allowed values for winFile.ctrlFlags
*/
#define WINFILE_PERSIST_WAL 0x04 /* Persistent WAL mode */
#define WINFILE_PSOW 0x10 /* SQLITE_IOCAP_POWERSAFE_OVERWRITE */
/*
* If compiled with SQLITE_WIN32_MALLOC on Windows, we will use the
* various Win32 API heap functions instead of our own.
*/
#ifdef SQLITE_WIN32_MALLOC
/*
* The initial size of the Win32-specific heap. This value may be zero.
*/
#ifndef SQLITE_WIN32_HEAP_INIT_SIZE
# define SQLITE_WIN32_HEAP_INIT_SIZE ((SQLITE_DEFAULT_CACHE_SIZE) * \
(SQLITE_DEFAULT_PAGE_SIZE) + 4194304)
#endif
/*
* The maximum size of the Win32-specific heap. This value may be zero.
*/
#ifndef SQLITE_WIN32_HEAP_MAX_SIZE
# define SQLITE_WIN32_HEAP_MAX_SIZE (0)
#endif
/*
* The extra flags to use in calls to the Win32 heap APIs. This value may be
* zero for the default behavior.
*/
#ifndef SQLITE_WIN32_HEAP_FLAGS
# define SQLITE_WIN32_HEAP_FLAGS (0)
#endif
/*
** The winMemData structure stores information required by the Win32-specific
** sqlite3_mem_methods implementation.
*/
typedef struct winMemData winMemData;
struct winMemData {
#ifndef NDEBUG
u32 magic; /* Magic number to detect structure corruption. */
#endif
HANDLE hHeap; /* The handle to our heap. */
BOOL bOwned; /* Do we own the heap (i.e. destroy it on shutdown)? */
};
#ifndef NDEBUG
#define WINMEM_MAGIC 0x42b2830b
#endif
static struct winMemData win_mem_data = {
#ifndef NDEBUG
WINMEM_MAGIC,
#endif
NULL, FALSE
};
#ifndef NDEBUG
#define winMemAssertMagic() assert( win_mem_data.magic==WINMEM_MAGIC )
#else
#define winMemAssertMagic()
#endif
#define winMemGetHeap() win_mem_data.hHeap
static void *winMemMalloc(int nBytes);
static void winMemFree(void *pPrior);
static void *winMemRealloc(void *pPrior, int nBytes);
static int winMemSize(void *p);
static int winMemRoundup(int n);
static int winMemInit(void *pAppData);
static void winMemShutdown(void *pAppData);
const sqlite3_mem_methods *sqlite3MemGetWin32(void);
#endif /* SQLITE_WIN32_MALLOC */
/*
** The following variable is (normally) set once and never changes
** thereafter. It records whether the operating system is Win9x
** or WinNT.
**
** 0: Operating system unknown.
** 1: Operating system is Win9x.
** 2: Operating system is WinNT.
**
** In order to facilitate testing on a WinNT system, the test fixture
** can manually set this value to 1 to emulate Win98 behavior.
*/
#ifdef SQLITE_TEST
int sqlite3_os_type = 0;
#else
static int sqlite3_os_type = 0;
#endif
/*
** Many system calls are accessed through pointer-to-functions so that
** they may be overridden at runtime to facilitate fault injection during
** testing and sandboxing. The following array holds the names and pointers
** to all overrideable system calls.
*/
#if !SQLITE_OS_WINCE
# define SQLITE_WIN32_HAS_ANSI
#endif
#if SQLITE_OS_WINCE || SQLITE_OS_WINNT
# define SQLITE_WIN32_HAS_WIDE
#endif
#ifndef SYSCALL
# define SYSCALL sqlite3_syscall_ptr
#endif
#if SQLITE_OS_WINCE
/*
** These macros are necessary because Windows CE does not natively support the
** Win32 APIs LockFile, UnlockFile, and LockFileEx.
*/
# define LockFile(a,b,c,d,e) winceLockFile(&a, b, c, d, e)
# define UnlockFile(a,b,c,d,e) winceUnlockFile(&a, b, c, d, e)
# define LockFileEx(a,b,c,d,e,f) winceLockFileEx(&a, b, c, d, e, f)
/*
** These are the special syscall hacks for Windows CE. The locking related
** defines here refer to the macros defined just above.
*/
# define osAreFileApisANSI() 1
# define osLockFile LockFile
# define osUnlockFile UnlockFile
# define osLockFileEx LockFileEx
#endif
static struct win_syscall {
const char *zName; /* Name of the sytem call */
sqlite3_syscall_ptr pCurrent; /* Current value of the system call */
sqlite3_syscall_ptr pDefault; /* Default value */
} aSyscall[] = {
#if !SQLITE_OS_WINCE
{ "AreFileApisANSI", (SYSCALL)AreFileApisANSI, 0 },
#define osAreFileApisANSI ((BOOL(WINAPI*)(VOID))aSyscall[0].pCurrent)
#else
{ "AreFileApisANSI", (SYSCALL)0, 0 },
#endif
#if SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_WIDE)
{ "CharLowerW", (SYSCALL)CharLowerW, 0 },
#else
{ "CharLowerW", (SYSCALL)0, 0 },
#endif
#define osCharLowerW ((LPWSTR(WINAPI*)(LPWSTR))aSyscall[1].pCurrent)
#if SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_WIDE)
{ "CharUpperW", (SYSCALL)CharUpperW, 0 },
#else
{ "CharUpperW", (SYSCALL)0, 0 },
#endif
#define osCharUpperW ((LPWSTR(WINAPI*)(LPWSTR))aSyscall[2].pCurrent)
{ "CloseHandle", (SYSCALL)CloseHandle, 0 },
#define osCloseHandle ((BOOL(WINAPI*)(HANDLE))aSyscall[3].pCurrent)
#if defined(SQLITE_WIN32_HAS_ANSI)
{ "CreateFileA", (SYSCALL)CreateFileA, 0 },
#else
{ "CreateFileA", (SYSCALL)0, 0 },
#endif
#define osCreateFileA ((HANDLE(WINAPI*)(LPCSTR,DWORD,DWORD, \
LPSECURITY_ATTRIBUTES,DWORD,DWORD,HANDLE))aSyscall[4].pCurrent)
#if defined(SQLITE_WIN32_HAS_WIDE)
{ "CreateFileW", (SYSCALL)CreateFileW, 0 },
#else
{ "CreateFileW", (SYSCALL)0, 0 },
#endif
#define osCreateFileW ((HANDLE(WINAPI*)(LPCWSTR,DWORD,DWORD, \
LPSECURITY_ATTRIBUTES,DWORD,DWORD,HANDLE))aSyscall[5].pCurrent)
{ "CreateFileMapping", (SYSCALL)CreateFileMapping, 0 },
#define osCreateFileMapping ((HANDLE(WINAPI*)(HANDLE,LPSECURITY_ATTRIBUTES, \
DWORD,DWORD,DWORD,LPCTSTR))aSyscall[6].pCurrent)
#if defined(SQLITE_WIN32_HAS_WIDE)
{ "CreateFileMappingW", (SYSCALL)CreateFileMappingW, 0 },
#else
{ "CreateFileMappingW", (SYSCALL)0, 0 },
#endif
#define osCreateFileMappingW ((HANDLE(WINAPI*)(HANDLE,LPSECURITY_ATTRIBUTES, \
DWORD,DWORD,DWORD,LPCWSTR))aSyscall[7].pCurrent)
#if defined(SQLITE_WIN32_HAS_WIDE)
{ "CreateMutexW", (SYSCALL)CreateMutexW, 0 },
#else
{ "CreateMutexW", (SYSCALL)0, 0 },
#endif
#define osCreateMutexW ((HANDLE(WINAPI*)(LPSECURITY_ATTRIBUTES,BOOL, \
LPCWSTR))aSyscall[8].pCurrent)
#if defined(SQLITE_WIN32_HAS_ANSI)
{ "DeleteFileA", (SYSCALL)DeleteFileA, 0 },
#else
{ "DeleteFileA", (SYSCALL)0, 0 },
#endif
#define osDeleteFileA ((BOOL(WINAPI*)(LPCSTR))aSyscall[9].pCurrent)
#if defined(SQLITE_WIN32_HAS_WIDE)
{ "DeleteFileW", (SYSCALL)DeleteFileW, 0 },
#else
{ "DeleteFileW", (SYSCALL)0, 0 },
#endif
#define osDeleteFileW ((BOOL(WINAPI*)(LPCWSTR))aSyscall[10].pCurrent)
#if SQLITE_OS_WINCE
{ "FileTimeToLocalFileTime", (SYSCALL)FileTimeToLocalFileTime, 0 },
#else
{ "FileTimeToLocalFileTime", (SYSCALL)0, 0 },
#endif
#define osFileTimeToLocalFileTime ((BOOL(WINAPI*)(CONST FILETIME*, \
LPFILETIME))aSyscall[11].pCurrent)
#if SQLITE_OS_WINCE
{ "FileTimeToSystemTime", (SYSCALL)FileTimeToSystemTime, 0 },
#else
{ "FileTimeToSystemTime", (SYSCALL)0, 0 },
#endif
#define osFileTimeToSystemTime ((BOOL(WINAPI*)(CONST FILETIME*, \
LPSYSTEMTIME))aSyscall[12].pCurrent)
{ "FlushFileBuffers", (SYSCALL)FlushFileBuffers, 0 },
#define osFlushFileBuffers ((BOOL(WINAPI*)(HANDLE))aSyscall[13].pCurrent)
#if defined(SQLITE_WIN32_HAS_ANSI)
{ "FormatMessageA", (SYSCALL)FormatMessageA, 0 },
#else
{ "FormatMessageA", (SYSCALL)0, 0 },
#endif
#define osFormatMessageA ((DWORD(WINAPI*)(DWORD,LPCVOID,DWORD,DWORD,LPSTR, \
DWORD,va_list*))aSyscall[14].pCurrent)
#if defined(SQLITE_WIN32_HAS_WIDE)
{ "FormatMessageW", (SYSCALL)FormatMessageW, 0 },
#else
{ "FormatMessageW", (SYSCALL)0, 0 },
#endif
#define osFormatMessageW ((DWORD(WINAPI*)(DWORD,LPCVOID,DWORD,DWORD,LPWSTR, \
DWORD,va_list*))aSyscall[15].pCurrent)
{ "FreeLibrary", (SYSCALL)FreeLibrary, 0 },
#define osFreeLibrary ((BOOL(WINAPI*)(HMODULE))aSyscall[16].pCurrent)
{ "GetCurrentProcessId", (SYSCALL)GetCurrentProcessId, 0 },
#define osGetCurrentProcessId ((DWORD(WINAPI*)(VOID))aSyscall[17].pCurrent)
#if !SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_ANSI)
{ "GetDiskFreeSpaceA", (SYSCALL)GetDiskFreeSpaceA, 0 },
#else
{ "GetDiskFreeSpaceA", (SYSCALL)0, 0 },
#endif
#define osGetDiskFreeSpaceA ((BOOL(WINAPI*)(LPCSTR,LPDWORD,LPDWORD,LPDWORD, \
LPDWORD))aSyscall[18].pCurrent)
#if !SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_WIDE)
{ "GetDiskFreeSpaceW", (SYSCALL)GetDiskFreeSpaceW, 0 },
#else
{ "GetDiskFreeSpaceW", (SYSCALL)0, 0 },
#endif
#define osGetDiskFreeSpaceW ((BOOL(WINAPI*)(LPCWSTR,LPDWORD,LPDWORD,LPDWORD, \
LPDWORD))aSyscall[19].pCurrent)
#if defined(SQLITE_WIN32_HAS_ANSI)
{ "GetFileAttributesA", (SYSCALL)GetFileAttributesA, 0 },
#else
{ "GetFileAttributesA", (SYSCALL)0, 0 },
#endif
#define osGetFileAttributesA ((DWORD(WINAPI*)(LPCSTR))aSyscall[20].pCurrent)
#if defined(SQLITE_WIN32_HAS_WIDE)
{ "GetFileAttributesW", (SYSCALL)GetFileAttributesW, 0 },
#else
{ "GetFileAttributesW", (SYSCALL)0, 0 },
#endif
#define osGetFileAttributesW ((DWORD(WINAPI*)(LPCWSTR))aSyscall[21].pCurrent)
#if defined(SQLITE_WIN32_HAS_WIDE)
{ "GetFileAttributesExW", (SYSCALL)GetFileAttributesExW, 0 },
#else
{ "GetFileAttributesExW", (SYSCALL)0, 0 },
#endif
#define osGetFileAttributesExW ((BOOL(WINAPI*)(LPCWSTR,GET_FILEEX_INFO_LEVELS, \
LPVOID))aSyscall[22].pCurrent)
{ "GetFileSize", (SYSCALL)GetFileSize, 0 },
#define osGetFileSize ((DWORD(WINAPI*)(HANDLE,LPDWORD))aSyscall[23].pCurrent)
#if !SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_ANSI)
{ "GetFullPathNameA", (SYSCALL)GetFullPathNameA, 0 },
#else
{ "GetFullPathNameA", (SYSCALL)0, 0 },
#endif
#define osGetFullPathNameA ((DWORD(WINAPI*)(LPCSTR,DWORD,LPSTR, \
LPSTR*))aSyscall[24].pCurrent)
#if !SQLITE_OS_WINCE && defined(SQLITE_WIN32_HAS_WIDE)
{ "GetFullPathNameW", (SYSCALL)GetFullPathNameW, 0 },
#else
{ "GetFullPathNameW", (SYSCALL)0, 0 },
#endif
#define osGetFullPathNameW ((DWORD(WINAPI*)(LPCWSTR,DWORD,LPWSTR, \
LPWSTR*))aSyscall[25].pCurrent)
{ "GetLastError", (SYSCALL)GetLastError, 0 },
#define osGetLastError ((DWORD(WINAPI*)(VOID))aSyscall[26].pCurrent)
#if SQLITE_OS_WINCE
/* The GetProcAddressA() routine is only available on Windows CE. */
{ "GetProcAddressA", (SYSCALL)GetProcAddressA, 0 },
#else
/* All other Windows platforms expect GetProcAddress() to take
** an ANSI string regardless of the _UNICODE setting */
{ "GetProcAddressA", (SYSCALL)GetProcAddress, 0 },
#endif
#define osGetProcAddressA ((FARPROC(WINAPI*)(HMODULE, \
LPCSTR))aSyscall[27].pCurrent)
{ "GetSystemInfo", (SYSCALL)GetSystemInfo, 0 },
#define osGetSystemInfo ((VOID(WINAPI*)(LPSYSTEM_INFO))aSyscall[28].pCurrent)
{ "GetSystemTime", (SYSCALL)GetSystemTime, 0 },
#define osGetSystemTime ((VOID(WINAPI*)(LPSYSTEMTIME))aSyscall[29].pCurrent)
#if !SQLITE_OS_WINCE
{ "GetSystemTimeAsFileTime", (SYSCALL)GetSystemTimeAsFileTime, 0 },
#else
{ "GetSystemTimeAsFileTime", (SYSCALL)0, 0 },
#endif
#define osGetSystemTimeAsFileTime ((VOID(WINAPI*)( \
LPFILETIME))aSyscall[30].pCurrent)
#if defined(SQLITE_WIN32_HAS_ANSI)
{ "GetTempPathA", (SYSCALL)GetTempPathA, 0 },
#else
{ "GetTempPathA", (SYSCALL)0, 0 },
#endif
#define osGetTempPathA ((DWORD(WINAPI*)(DWORD,LPSTR))aSyscall[31].pCurrent)
#if defined(SQLITE_WIN32_HAS_WIDE)
{ "GetTempPathW", (SYSCALL)GetTempPathW, 0 },
#else
{ "GetTempPathW", (SYSCALL)0, 0 },
#endif
#define osGetTempPathW ((DWORD(WINAPI*)(DWORD,LPWSTR))aSyscall[32].pCurrent)
{ "GetTickCount", (SYSCALL)GetTickCount, 0 },
#define osGetTickCount ((DWORD(WINAPI*)(VOID))aSyscall[33].pCurrent)
#if defined(SQLITE_WIN32_HAS_ANSI)
{ "GetVersionExA", (SYSCALL)GetVersionExA, 0 },
#else
{ "GetVersionExA", (SYSCALL)0, 0 },
#endif
#define osGetVersionExA ((BOOL(WINAPI*)( \
LPOSVERSIONINFOA))aSyscall[34].pCurrent)
{ "HeapAlloc", (SYSCALL)HeapAlloc, 0 },
#define osHeapAlloc ((LPVOID(WINAPI*)(HANDLE,DWORD, \
SIZE_T))aSyscall[35].pCurrent)
{ "HeapCreate", (SYSCALL)HeapCreate, 0 },
#define osHeapCreate ((HANDLE(WINAPI*)(DWORD,SIZE_T, \
SIZE_T))aSyscall[36].pCurrent)
{ "HeapDestroy", (SYSCALL)HeapDestroy, 0 },
#define osHeapDestroy ((BOOL(WINAPI*)(HANDLE))aSyscall[37].pCurrent)
{ "HeapFree", (SYSCALL)HeapFree, 0 },
#define osHeapFree ((BOOL(WINAPI*)(HANDLE,DWORD,LPVOID))aSyscall[38].pCurrent)
{ "HeapReAlloc", (SYSCALL)HeapReAlloc, 0 },
#define osHeapReAlloc ((LPVOID(WINAPI*)(HANDLE,DWORD,LPVOID, \
SIZE_T))aSyscall[39].pCurrent)
{ "HeapSize", (SYSCALL)HeapSize, 0 },
#define osHeapSize ((SIZE_T(WINAPI*)(HANDLE,DWORD, \
LPCVOID))aSyscall[40].pCurrent)
{ "HeapValidate", (SYSCALL)HeapValidate, 0 },
#define osHeapValidate ((BOOL(WINAPI*)(HANDLE,DWORD, \
LPCVOID))aSyscall[41].pCurrent)
#if defined(SQLITE_WIN32_HAS_ANSI)
{ "LoadLibraryA", (SYSCALL)LoadLibraryA, 0 },
#else
{ "LoadLibraryA", (SYSCALL)0, 0 },
#endif
#define osLoadLibraryA ((HMODULE(WINAPI*)(LPCSTR))aSyscall[42].pCurrent)
#if defined(SQLITE_WIN32_HAS_WIDE)
{ "LoadLibraryW", (SYSCALL)LoadLibraryW, 0 },
#else
{ "LoadLibraryW", (SYSCALL)0, 0 },
#endif
#define osLoadLibraryW ((HMODULE(WINAPI*)(LPCWSTR))aSyscall[43].pCurrent)
{ "LocalFree", (SYSCALL)LocalFree, 0 },
#define osLocalFree ((HLOCAL(WINAPI*)(HLOCAL))aSyscall[44].pCurrent)
#if !SQLITE_OS_WINCE
{ "LockFile", (SYSCALL)LockFile, 0 },
#define osLockFile ((BOOL(WINAPI*)(HANDLE,DWORD,DWORD,DWORD, \
DWORD))aSyscall[45].pCurrent)
#else
{ "LockFile", (SYSCALL)0, 0 },
#endif
#if !SQLITE_OS_WINCE
{ "LockFileEx", (SYSCALL)LockFileEx, 0 },
#define osLockFileEx ((BOOL(WINAPI*)(HANDLE,DWORD,DWORD,DWORD,DWORD, \
LPOVERLAPPED))aSyscall[46].pCurrent)
#else
{ "LockFileEx", (SYSCALL)0, 0 },
#endif
{ "MapViewOfFile", (SYSCALL)MapViewOfFile, 0 },
#define osMapViewOfFile ((LPVOID(WINAPI*)(HANDLE,DWORD,DWORD,DWORD, \
SIZE_T))aSyscall[47].pCurrent)
{ "MultiByteToWideChar", (SYSCALL)MultiByteToWideChar, 0 },
#define osMultiByteToWideChar ((int(WINAPI*)(UINT,DWORD,LPCSTR,int,LPWSTR, \
int))aSyscall[48].pCurrent)
{ "QueryPerformanceCounter", (SYSCALL)QueryPerformanceCounter, 0 },
#define osQueryPerformanceCounter ((BOOL(WINAPI*)( \
LARGE_INTEGER*))aSyscall[49].pCurrent)
{ "ReadFile", (SYSCALL)ReadFile, 0 },
#define osReadFile ((BOOL(WINAPI*)(HANDLE,LPVOID,DWORD,LPDWORD, \
LPOVERLAPPED))aSyscall[50].pCurrent)
{ "SetEndOfFile", (SYSCALL)SetEndOfFile, 0 },
#define osSetEndOfFile ((BOOL(WINAPI*)(HANDLE))aSyscall[51].pCurrent)
{ "SetFilePointer", (SYSCALL)SetFilePointer, 0 },
#define osSetFilePointer ((DWORD(WINAPI*)(HANDLE,LONG,PLONG, \
DWORD))aSyscall[52].pCurrent)
{ "Sleep", (SYSCALL)Sleep, 0 },
#define osSleep ((VOID(WINAPI*)(DWORD))aSyscall[53].pCurrent)
{ "SystemTimeToFileTime", (SYSCALL)SystemTimeToFileTime, 0 },
#define osSystemTimeToFileTime ((BOOL(WINAPI*)(CONST SYSTEMTIME*, \
LPFILETIME))aSyscall[54].pCurrent)
#if !SQLITE_OS_WINCE
{ "UnlockFile", (SYSCALL)UnlockFile, 0 },
#define osUnlockFile ((BOOL(WINAPI*)(HANDLE,DWORD,DWORD,DWORD, \
DWORD))aSyscall[55].pCurrent)
#else
{ "UnlockFile", (SYSCALL)0, 0 },
#endif
#if !SQLITE_OS_WINCE
{ "UnlockFileEx", (SYSCALL)UnlockFileEx, 0 },
#define osUnlockFileEx ((BOOL(WINAPI*)(HANDLE,DWORD,DWORD,DWORD, \
LPOVERLAPPED))aSyscall[56].pCurrent)
#else
{ "UnlockFileEx", (SYSCALL)0, 0 },
#endif
{ "UnmapViewOfFile", (SYSCALL)UnmapViewOfFile, 0 },
#define osUnmapViewOfFile ((BOOL(WINAPI*)(LPCVOID))aSyscall[57].pCurrent)
{ "WideCharToMultiByte", (SYSCALL)WideCharToMultiByte, 0 },
#define osWideCharToMultiByte ((int(WINAPI*)(UINT,DWORD,LPCWSTR,int,LPSTR,int, \
LPCSTR,LPBOOL))aSyscall[58].pCurrent)
{ "WriteFile", (SYSCALL)WriteFile, 0 },
#define osWriteFile ((BOOL(WINAPI*)(HANDLE,LPCVOID,DWORD,LPDWORD, \
LPOVERLAPPED))aSyscall[59].pCurrent)
}; /* End of the overrideable system calls */
/*
** This is the xSetSystemCall() method of sqlite3_vfs for all of the
** "win32" VFSes. Return SQLITE_OK opon successfully updating the
** system call pointer, or SQLITE_NOTFOUND if there is no configurable
** system call named zName.
*/
static int winSetSystemCall(
sqlite3_vfs *pNotUsed, /* The VFS pointer. Not used */
const char *zName, /* Name of system call to override */
sqlite3_syscall_ptr pNewFunc /* Pointer to new system call value */
){
unsigned int i;
int rc = SQLITE_NOTFOUND;
UNUSED_PARAMETER(pNotUsed);
if( zName==0 ){
/* If no zName is given, restore all system calls to their default
** settings and return NULL
*/
rc = SQLITE_OK;
for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
if( aSyscall[i].pDefault ){
aSyscall[i].pCurrent = aSyscall[i].pDefault;
}
}
}else{
/* If zName is specified, operate on only the one system call
** specified.
*/
for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
if( strcmp(zName, aSyscall[i].zName)==0 ){
if( aSyscall[i].pDefault==0 ){
aSyscall[i].pDefault = aSyscall[i].pCurrent;
}
rc = SQLITE_OK;
if( pNewFunc==0 ) pNewFunc = aSyscall[i].pDefault;
aSyscall[i].pCurrent = pNewFunc;
break;
}
}
}
return rc;
}
/*
** Return the value of a system call. Return NULL if zName is not a
** recognized system call name. NULL is also returned if the system call
** is currently undefined.
*/
static sqlite3_syscall_ptr winGetSystemCall(
sqlite3_vfs *pNotUsed,
const char *zName
){
unsigned int i;
UNUSED_PARAMETER(pNotUsed);
for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
if( strcmp(zName, aSyscall[i].zName)==0 ) return aSyscall[i].pCurrent;
}
return 0;
}
/*
** Return the name of the first system call after zName. If zName==NULL
** then return the name of the first system call. Return NULL if zName
** is the last system call or if zName is not the name of a valid
** system call.
*/
static const char *winNextSystemCall(sqlite3_vfs *p, const char *zName){
int i = -1;
UNUSED_PARAMETER(p);
if( zName ){
for(i=0; i<ArraySize(aSyscall)-1; i++){
if( strcmp(zName, aSyscall[i].zName)==0 ) break;
}
}
for(i++; i<ArraySize(aSyscall); i++){
if( aSyscall[i].pCurrent!=0 ) return aSyscall[i].zName;
}
return 0;
}
/*
** Return true (non-zero) if we are running under WinNT, Win2K, WinXP,
** or WinCE. 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 when 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.
*/
#if SQLITE_OS_WINCE
# define isNT() (1)
#else
static int isNT(void){
if( sqlite3_os_type==0 ){
OSVERSIONINFOA sInfo;
sInfo.dwOSVersionInfoSize = sizeof(sInfo);
osGetVersionExA(&sInfo);
sqlite3_os_type = sInfo.dwPlatformId==VER_PLATFORM_WIN32_NT ? 2 : 1;
}
return sqlite3_os_type==2;
}
#endif /* SQLITE_OS_WINCE */
#ifdef SQLITE_WIN32_MALLOC
/*
** Allocate nBytes of memory.
*/
static void *winMemMalloc(int nBytes){
HANDLE hHeap;
void *p;
winMemAssertMagic();
hHeap = winMemGetHeap();
assert( hHeap!=0 );
assert( hHeap!=INVALID_HANDLE_VALUE );
#ifdef SQLITE_WIN32_MALLOC_VALIDATE
assert ( osHeapValidate(hHeap, SQLITE_WIN32_HEAP_FLAGS, NULL) );
#endif
assert( nBytes>=0 );
p = osHeapAlloc(hHeap, SQLITE_WIN32_HEAP_FLAGS, (SIZE_T)nBytes);
if( !p ){
sqlite3_log(SQLITE_NOMEM, "failed to HeapAlloc %u bytes (%d), heap=%p",
nBytes, osGetLastError(), (void*)hHeap);
}
return p;
}
/*
** Free memory.
*/
static void winMemFree(void *pPrior){
HANDLE hHeap;
winMemAssertMagic();
hHeap = winMemGetHeap();
assert( hHeap!=0 );
assert( hHeap!=INVALID_HANDLE_VALUE );
#ifdef SQLITE_WIN32_MALLOC_VALIDATE
assert ( osHeapValidate(hHeap, SQLITE_WIN32_HEAP_FLAGS, pPrior) );
#endif
if( !pPrior ) return; /* Passing NULL to HeapFree is undefined. */
if( !osHeapFree(hHeap, SQLITE_WIN32_HEAP_FLAGS, pPrior) ){
sqlite3_log(SQLITE_NOMEM, "failed to HeapFree block %p (%d), heap=%p",
pPrior, osGetLastError(), (void*)hHeap);
}
}
/*
** Change the size of an existing memory allocation
*/
static void *winMemRealloc(void *pPrior, int nBytes){
HANDLE hHeap;
void *p;
winMemAssertMagic();
hHeap = winMemGetHeap();
assert( hHeap!=0 );
assert( hHeap!=INVALID_HANDLE_VALUE );
#ifdef SQLITE_WIN32_MALLOC_VALIDATE
assert ( osHeapValidate(hHeap, SQLITE_WIN32_HEAP_FLAGS, pPrior) );
#endif
assert( nBytes>=0 );
if( !pPrior ){
p = osHeapAlloc(hHeap, SQLITE_WIN32_HEAP_FLAGS, (SIZE_T)nBytes);
}else{
p = osHeapReAlloc(hHeap, SQLITE_WIN32_HEAP_FLAGS, pPrior, (SIZE_T)nBytes);
}
if( !p ){
sqlite3_log(SQLITE_NOMEM, "failed to %s %u bytes (%d), heap=%p",
pPrior ? "HeapReAlloc" : "HeapAlloc", nBytes, osGetLastError(),
(void*)hHeap);
}
return p;
}
/*
** Return the size of an outstanding allocation, in bytes.
*/
static int winMemSize(void *p){
HANDLE hHeap;
SIZE_T n;
winMemAssertMagic();
hHeap = winMemGetHeap();
assert( hHeap!=0 );
assert( hHeap!=INVALID_HANDLE_VALUE );
#ifdef SQLITE_WIN32_MALLOC_VALIDATE
assert ( osHeapValidate(hHeap, SQLITE_WIN32_HEAP_FLAGS, NULL) );
#endif
if( !p ) return 0;
n = osHeapSize(hHeap, SQLITE_WIN32_HEAP_FLAGS, p);
if( n==(SIZE_T)-1 ){
sqlite3_log(SQLITE_NOMEM, "failed to HeapSize block %p (%d), heap=%p",
p, osGetLastError(), (void*)hHeap);
return 0;
}
return (int)n;
}
/*
** Round up a request size to the next valid allocation size.
*/
static int winMemRoundup(int n){
return n;
}
/*
** Initialize this module.
*/
static int winMemInit(void *pAppData){
winMemData *pWinMemData = (winMemData *)pAppData;
if( !pWinMemData ) return SQLITE_ERROR;
assert( pWinMemData->magic==WINMEM_MAGIC );
if( !pWinMemData->hHeap ){
pWinMemData->hHeap = osHeapCreate(SQLITE_WIN32_HEAP_FLAGS,
SQLITE_WIN32_HEAP_INIT_SIZE,
SQLITE_WIN32_HEAP_MAX_SIZE);
if( !pWinMemData->hHeap ){
sqlite3_log(SQLITE_NOMEM,
"failed to HeapCreate (%d), flags=%u, initSize=%u, maxSize=%u",
osGetLastError(), SQLITE_WIN32_HEAP_FLAGS,
SQLITE_WIN32_HEAP_INIT_SIZE, SQLITE_WIN32_HEAP_MAX_SIZE);
return SQLITE_NOMEM;
}
pWinMemData->bOwned = TRUE;
}
assert( pWinMemData->hHeap!=0 );
assert( pWinMemData->hHeap!=INVALID_HANDLE_VALUE );
#ifdef SQLITE_WIN32_MALLOC_VALIDATE
assert( osHeapValidate(pWinMemData->hHeap, SQLITE_WIN32_HEAP_FLAGS, NULL) );
#endif
return SQLITE_OK;
}
/*
** Deinitialize this module.
*/
static void winMemShutdown(void *pAppData){
winMemData *pWinMemData = (winMemData *)pAppData;
if( !pWinMemData ) return;
if( pWinMemData->hHeap ){
assert( pWinMemData->hHeap!=INVALID_HANDLE_VALUE );
#ifdef SQLITE_WIN32_MALLOC_VALIDATE
assert( osHeapValidate(pWinMemData->hHeap, SQLITE_WIN32_HEAP_FLAGS, NULL) );
#endif
if( pWinMemData->bOwned ){
if( !osHeapDestroy(pWinMemData->hHeap) ){
sqlite3_log(SQLITE_NOMEM, "failed to HeapDestroy (%d), heap=%p",
osGetLastError(), (void*)pWinMemData->hHeap);
}
pWinMemData->bOwned = FALSE;
}
pWinMemData->hHeap = NULL;
}
}
/*
** Populate the low-level memory allocation function pointers in
** sqlite3GlobalConfig.m with pointers to the routines in this file. The
** arguments specify the block of memory to manage.
**
** This routine is only called by sqlite3_config(), and therefore
** is not required to be threadsafe (it is not).
*/
const sqlite3_mem_methods *sqlite3MemGetWin32(void){
static const sqlite3_mem_methods winMemMethods = {
winMemMalloc,
winMemFree,
winMemRealloc,
winMemSize,
winMemRoundup,
winMemInit,
winMemShutdown,
&win_mem_data
};
return &winMemMethods;
}
void sqlite3MemSetDefault(void){
sqlite3_config(SQLITE_CONFIG_MALLOC, sqlite3MemGetWin32());
}
#endif /* SQLITE_WIN32_MALLOC */
/*
** Convert a UTF-8 string to Microsoft Unicode (UTF-16?).
**
** Space to hold the returned string is obtained from malloc.
*/
static LPWSTR utf8ToUnicode(const char *zFilename){
int nChar;
LPWSTR zWideFilename;
nChar = osMultiByteToWideChar(CP_UTF8, 0, zFilename, -1, NULL, 0);
if( nChar==0 ){
return 0;
}
zWideFilename = sqlite3_malloc( nChar*sizeof(zWideFilename[0]) );
if( zWideFilename==0 ){
return 0;
}
nChar = osMultiByteToWideChar(CP_UTF8, 0, zFilename, -1, zWideFilename,
nChar);
if( nChar==0 ){
sqlite3_free(zWideFilename);
zWideFilename = 0;
}
return zWideFilename;
}
/*
** Convert Microsoft Unicode to UTF-8. Space to hold the returned string is
** obtained from sqlite3_malloc().
*/
static char *unicodeToUtf8(LPCWSTR zWideFilename){
int nByte;
char *zFilename;
nByte = osWideCharToMultiByte(CP_UTF8, 0, zWideFilename, -1, 0, 0, 0, 0);
if( nByte == 0 ){
return 0;
}
zFilename = sqlite3_malloc( nByte );
if( zFilename==0 ){
return 0;
}
nByte = osWideCharToMultiByte(CP_UTF8, 0, zWideFilename, -1, zFilename, nByte,
0, 0);
if( nByte == 0 ){
sqlite3_free(zFilename);
zFilename = 0;
}
return zFilename;
}
/*
** Convert an ANSI string to Microsoft Unicode, based on the
** current codepage settings for file apis.
**
** Space to hold the returned string is obtained
** from sqlite3_malloc.
*/
static LPWSTR mbcsToUnicode(const char *zFilename){
int nByte;
LPWSTR zMbcsFilename;
int codepage = osAreFileApisANSI() ? CP_ACP : CP_OEMCP;
nByte = osMultiByteToWideChar(codepage, 0, zFilename, -1, NULL,
0)*sizeof(WCHAR);
if( nByte==0 ){
return 0;
}
zMbcsFilename = sqlite3_malloc( nByte*sizeof(zMbcsFilename[0]) );
if( zMbcsFilename==0 ){
return 0;
}
nByte = osMultiByteToWideChar(codepage, 0, zFilename, -1, zMbcsFilename,
nByte);
if( nByte==0 ){
sqlite3_free(zMbcsFilename);
zMbcsFilename = 0;
}
return zMbcsFilename;
}
/*
** Convert Microsoft Unicode to multi-byte character string, based on the
** user's ANSI codepage.
**
** Space to hold the returned string is obtained from
** sqlite3_malloc().
*/
static char *unicodeToMbcs(LPCWSTR zWideFilename){
int nByte;
char *zFilename;
int codepage = osAreFileApisANSI() ? CP_ACP : CP_OEMCP;
nByte = osWideCharToMultiByte(codepage, 0, zWideFilename, -1, 0, 0, 0, 0);
if( nByte == 0 ){
return 0;
}
zFilename = sqlite3_malloc( nByte );
if( zFilename==0 ){
return 0;
}
nByte = osWideCharToMultiByte(codepage, 0, zWideFilename, -1, zFilename,
nByte, 0, 0);
if( nByte == 0 ){
sqlite3_free(zFilename);
zFilename = 0;
}
return zFilename;
}
/*
** Convert multibyte character string to UTF-8. Space to hold the
** returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_mbcs_to_utf8(const char *zFilename){
char *zFilenameUtf8;
LPWSTR zTmpWide;
zTmpWide = mbcsToUnicode(zFilename);
if( zTmpWide==0 ){
return 0;
}
zFilenameUtf8 = unicodeToUtf8(zTmpWide);
sqlite3_free(zTmpWide);
return zFilenameUtf8;
}
/*
** Convert UTF-8 to multibyte character string. Space to hold the
** returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_utf8_to_mbcs(const char *zFilename){
char *zFilenameMbcs;
LPWSTR zTmpWide;
zTmpWide = utf8ToUnicode(zFilename);
if( zTmpWide==0 ){
return 0;
}
zFilenameMbcs = unicodeToMbcs(zTmpWide);
sqlite3_free(zTmpWide);
return zFilenameMbcs;
}
/*
** The return value of getLastErrorMsg
** is zero if the error message fits in the buffer, or non-zero
** otherwise (if the message was truncated).
*/
static int getLastErrorMsg(DWORD lastErrno, int nBuf, char *zBuf){
/* FormatMessage returns 0 on failure. Otherwise it
** returns the number of TCHARs written to the output
** buffer, excluding the terminating null char.
*/
DWORD dwLen = 0;
char *zOut = 0;
if( isNT() ){
LPWSTR zTempWide = NULL;
dwLen = osFormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
lastErrno,
0,
(LPWSTR) &zTempWide,
0,
0);
if( dwLen > 0 ){
/* allocate a buffer and convert to UTF8 */
sqlite3BeginBenignMalloc();
zOut = unicodeToUtf8(zTempWide);
sqlite3EndBenignMalloc();
/* free the system buffer allocated by FormatMessage */
osLocalFree(zTempWide);
}
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
** Since the ANSI version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
}else{
char *zTemp = NULL;
dwLen = osFormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
lastErrno,
0,
(LPSTR) &zTemp,
0,
0);
if( dwLen > 0 ){
/* allocate a buffer and convert to UTF8 */
sqlite3BeginBenignMalloc();
zOut = sqlite3_win32_mbcs_to_utf8(zTemp);
sqlite3EndBenignMalloc();
/* free the system buffer allocated by FormatMessage */
osLocalFree(zTemp);
}
#endif
}
if( 0 == dwLen ){
sqlite3_snprintf(nBuf, zBuf, "OsError 0x%x (%u)", lastErrno, lastErrno);
}else{
/* copy a maximum of nBuf chars to output buffer */
sqlite3_snprintf(nBuf, zBuf, "%s", zOut);
/* free the UTF8 buffer */
sqlite3_free(zOut);
}
return 0;
}
/*
**
** This function - winLogErrorAtLine() - is only ever called via the macro
** winLogError().
**
** This routine is invoked after an error occurs in an OS function.
** It logs a message using sqlite3_log() containing the current value of
** error code and, if possible, the human-readable equivalent from
** FormatMessage.
**
** The first argument passed to the macro should be the error code that
** will be returned to SQLite (e.g. SQLITE_IOERR_DELETE, SQLITE_CANTOPEN).
** The two subsequent arguments should be the name of the OS function that
** failed and the the associated file-system path, if any.
*/
#define winLogError(a,b,c,d) winLogErrorAtLine(a,b,c,d,__LINE__)
static int winLogErrorAtLine(
int errcode, /* SQLite error code */
DWORD lastErrno, /* Win32 last error */
const char *zFunc, /* Name of OS function that failed */
const char *zPath, /* File path associated with error */
int iLine /* Source line number where error occurred */
){
char zMsg[500]; /* Human readable error text */
int i; /* Loop counter */
zMsg[0] = 0;
getLastErrorMsg(lastErrno, sizeof(zMsg), zMsg);
assert( errcode!=SQLITE_OK );
if( zPath==0 ) zPath = "";
for(i=0; zMsg[i] && zMsg[i]!='\r' && zMsg[i]!='\n'; i++){}
zMsg[i] = 0;
sqlite3_log(errcode,
"os_win.c:%d: (%d) %s(%s) - %s",
iLine, lastErrno, zFunc, zPath, zMsg
);
return errcode;
}
/*
** The number of times that a ReadFile(), WriteFile(), and DeleteFile()
** will be retried following a locking error - probably caused by
** antivirus software. Also the initial delay before the first retry.
** The delay increases linearly with each retry.
*/
#ifndef SQLITE_WIN32_IOERR_RETRY
# define SQLITE_WIN32_IOERR_RETRY 10
#endif
#ifndef SQLITE_WIN32_IOERR_RETRY_DELAY
# define SQLITE_WIN32_IOERR_RETRY_DELAY 25
#endif
static int win32IoerrRetry = SQLITE_WIN32_IOERR_RETRY;
static int win32IoerrRetryDelay = SQLITE_WIN32_IOERR_RETRY_DELAY;
/*
** If a ReadFile() or WriteFile() error occurs, invoke this routine
** to see if it should be retried. Return TRUE to retry. Return FALSE
** to give up with an error.
*/
static int retryIoerr(int *pnRetry, DWORD *pError){
DWORD e = osGetLastError();
if( *pnRetry>=win32IoerrRetry ){
if( pError ){
*pError = e;
}
return 0;
}
if( e==ERROR_ACCESS_DENIED ||
e==ERROR_LOCK_VIOLATION ||
e==ERROR_SHARING_VIOLATION ){
osSleep(win32IoerrRetryDelay*(1+*pnRetry));
++*pnRetry;
return 1;
}
if( pError ){
*pError = e;
}
return 0;
}
/*
** Log a I/O error retry episode.
*/
static void logIoerr(int nRetry){
if( nRetry ){
sqlite3_log(SQLITE_IOERR,
"delayed %dms for lock/sharing conflict",
win32IoerrRetryDelay*nRetry*(nRetry+1)/2
);
}
}
#if SQLITE_OS_WINCE
/*************************************************************************
** This section contains code for WinCE only.
*/
/*
** Windows CE does not have a localtime() function. So create a
** substitute.
*/
#include <time.h>
struct tm *__cdecl localtime(const time_t *t)
{
static struct tm y;
FILETIME uTm, lTm;
SYSTEMTIME pTm;
sqlite3_int64 t64;
t64 = *t;
t64 = (t64 + 11644473600)*10000000;
uTm.dwLowDateTime = (DWORD)(t64 & 0xFFFFFFFF);
uTm.dwHighDateTime= (DWORD)(t64 >> 32);
osFileTimeToLocalFileTime(&uTm,&lTm);
osFileTimeToSystemTime(&lTm,&pTm);
y.tm_year = pTm.wYear - 1900;
y.tm_mon = pTm.wMonth - 1;
y.tm_wday = pTm.wDayOfWeek;
y.tm_mday = pTm.wDay;
y.tm_hour = pTm.wHour;
y.tm_min = pTm.wMinute;
y.tm_sec = pTm.wSecond;
return &y;
}
#define HANDLE_TO_WINFILE(a) (winFile*)&((char*)a)[-(int)offsetof(winFile,h)]
/*
** Acquire a lock on the handle h
*/
static void winceMutexAcquire(HANDLE h){
DWORD dwErr;
do {
dwErr = WaitForSingleObject(h, INFINITE);
} while (dwErr != WAIT_OBJECT_0 && dwErr != WAIT_ABANDONED);
}
/*
** Release a lock acquired by winceMutexAcquire()
*/
#define winceMutexRelease(h) ReleaseMutex(h)
/*
** Create the mutex and shared memory used for locking in the file
** descriptor pFile
*/
static BOOL winceCreateLock(const char *zFilename, winFile *pFile){
LPWSTR zTok;
LPWSTR zName;
BOOL bInit = TRUE;
zName = utf8ToUnicode(zFilename);
if( zName==0 ){
/* out of memory */
return FALSE;
}
/* Initialize the local lockdata */
memset(&pFile->local, 0, sizeof(pFile->local));
/* Replace the backslashes from the filename and lowercase it
** to derive a mutex name. */
zTok = osCharLowerW(zName);
for (;*zTok;zTok++){
if (*zTok == '\\') *zTok = '_';
}
/* Create/open the named mutex */
pFile->hMutex = osCreateMutexW(NULL, FALSE, zName);
if (!pFile->hMutex){
pFile->lastErrno = osGetLastError();
winLogError(SQLITE_ERROR, pFile->lastErrno, "winceCreateLock1", zFilename);
sqlite3_free(zName);
return FALSE;
}
/* Acquire the mutex before continuing */
winceMutexAcquire(pFile->hMutex);
/* Since the names of named mutexes, semaphores, file mappings etc are
** case-sensitive, take advantage of that by uppercasing the mutex name
** and using that as the shared filemapping name.
*/
osCharUpperW(zName);
pFile->hShared = osCreateFileMappingW(INVALID_HANDLE_VALUE, NULL,
PAGE_READWRITE, 0, sizeof(winceLock),
zName);
/* Set a flag that indicates we're the first to create the memory so it
** must be zero-initialized */
if (osGetLastError() == ERROR_ALREADY_EXISTS){
bInit = FALSE;
}
sqlite3_free(zName);
/* If we succeeded in making the shared memory handle, map it. */
if (pFile->hShared){
pFile->shared = (winceLock*)osMapViewOfFile(pFile->hShared,
FILE_MAP_READ|FILE_MAP_WRITE, 0, 0, sizeof(winceLock));
/* If mapping failed, close the shared memory handle and erase it */
if (!pFile->shared){
pFile->lastErrno = osGetLastError();
winLogError(SQLITE_ERROR, pFile->lastErrno,
"winceCreateLock2", zFilename);
osCloseHandle(pFile->hShared);
pFile->hShared = NULL;
}
}
/* If shared memory could not be created, then close the mutex and fail */
if (pFile->hShared == NULL){
winceMutexRelease(pFile->hMutex);
osCloseHandle(pFile->hMutex);
pFile->hMutex = NULL;
return FALSE;
}
/* Initialize the shared memory if we're supposed to */
if (bInit) {
memset(pFile->shared, 0, sizeof(winceLock));
}
winceMutexRelease(pFile->hMutex);
return TRUE;
}
/*
** Destroy the part of winFile that deals with wince locks
*/
static void winceDestroyLock(winFile *pFile){
if (pFile->hMutex){
/* Acquire the mutex */
winceMutexAcquire(pFile->hMutex);
/* The following blocks should probably assert in debug mode, but they
are to cleanup in case any locks remained open */
if (pFile->local.nReaders){
pFile->shared->nReaders --;
}
if (pFile->local.bReserved){
pFile->shared->bReserved = FALSE;
}
if (pFile->local.bPending){
pFile->shared->bPending = FALSE;
}
if (pFile->local.bExclusive){
pFile->shared->bExclusive = FALSE;
}
/* De-reference and close our copy of the shared memory handle */
osUnmapViewOfFile(pFile->shared);
osCloseHandle(pFile->hShared);
/* Done with the mutex */
winceMutexRelease(pFile->hMutex);
osCloseHandle(pFile->hMutex);
pFile->hMutex = NULL;
}
}
/*
** An implementation of the LockFile() API of Windows for CE
*/
static BOOL winceLockFile(
HANDLE *phFile,
DWORD dwFileOffsetLow,
DWORD dwFileOffsetHigh,
DWORD nNumberOfBytesToLockLow,
DWORD nNumberOfBytesToLockHigh
){
winFile *pFile = HANDLE_TO_WINFILE(phFile);
BOOL bReturn = FALSE;
UNUSED_PARAMETER(dwFileOffsetHigh);
UNUSED_PARAMETER(nNumberOfBytesToLockHigh);
if (!pFile->hMutex) return TRUE;
winceMutexAcquire(pFile->hMutex);
/* Wanting an exclusive lock? */
if (dwFileOffsetLow == (DWORD)SHARED_FIRST
&& nNumberOfBytesToLockLow == (DWORD)SHARED_SIZE){
if (pFile->shared->nReaders == 0 && pFile->shared->bExclusive == 0){
pFile->shared->bExclusive = TRUE;
pFile->local.bExclusive = TRUE;
bReturn = TRUE;
}
}
/* Want a read-only lock? */
else if (dwFileOffsetLow == (DWORD)SHARED_FIRST &&
nNumberOfBytesToLockLow == 1){
if (pFile->shared->bExclusive == 0){
pFile->local.nReaders ++;
if (pFile->local.nReaders == 1){
pFile->shared->nReaders ++;
}
bReturn = TRUE;
}
}
/* Want a pending lock? */
else if (dwFileOffsetLow == (DWORD)PENDING_BYTE && nNumberOfBytesToLockLow == 1){
/* If no pending lock has been acquired, then acquire it */
if (pFile->shared->bPending == 0) {
pFile->shared->bPending = TRUE;
pFile->local.bPending = TRUE;
bReturn = TRUE;
}
}
/* Want a reserved lock? */
else if (dwFileOffsetLow == (DWORD)RESERVED_BYTE && nNumberOfBytesToLockLow == 1){
if (pFile->shared->bReserved == 0) {
pFile->shared->bReserved = TRUE;
pFile->local.bReserved = TRUE;
bReturn = TRUE;
}
}
winceMutexRelease(pFile->hMutex);
return bReturn;
}
/*
** An implementation of the UnlockFile API of Windows for CE
*/
static BOOL winceUnlockFile(
HANDLE *phFile,
DWORD dwFileOffsetLow,
DWORD dwFileOffsetHigh,
DWORD nNumberOfBytesToUnlockLow,
DWORD nNumberOfBytesToUnlockHigh
){
winFile *pFile = HANDLE_TO_WINFILE(phFile);
BOOL bReturn = FALSE;
UNUSED_PARAMETER(dwFileOffsetHigh);
UNUSED_PARAMETER(nNumberOfBytesToUnlockHigh);
if (!pFile->hMutex) return TRUE;
winceMutexAcquire(pFile->hMutex);
/* Releasing a reader lock or an exclusive lock */
if (dwFileOffsetLow == (DWORD)SHARED_FIRST){
/* Did we have an exclusive lock? */
if (pFile->local.bExclusive){
assert(nNumberOfBytesToUnlockLow == (DWORD)SHARED_SIZE);
pFile->local.bExclusive = FALSE;
pFile->shared->bExclusive = FALSE;
bReturn = TRUE;
}
/* Did we just have a reader lock? */
else if (pFile->local.nReaders){
assert(nNumberOfBytesToUnlockLow == (DWORD)SHARED_SIZE || nNumberOfBytesToUnlockLow == 1);
pFile->local.nReaders --;
if (pFile->local.nReaders == 0)
{
pFile->shared->nReaders --;
}
bReturn = TRUE;
}
}
/* Releasing a pending lock */
else if (dwFileOffsetLow == (DWORD)PENDING_BYTE && nNumberOfBytesToUnlockLow == 1){
if (pFile->local.bPending){
pFile->local.bPending = FALSE;
pFile->shared->bPending = FALSE;
bReturn = TRUE;
}
}
/* Releasing a reserved lock */
else if (dwFileOffsetLow == (DWORD)RESERVED_BYTE && nNumberOfBytesToUnlockLow == 1){
if (pFile->local.bReserved) {
pFile->local.bReserved = FALSE;
pFile->shared->bReserved = FALSE;
bReturn = TRUE;
}
}
winceMutexRelease(pFile->hMutex);
return bReturn;
}
/*
** An implementation of the LockFileEx() API of Windows for CE
*/
static BOOL winceLockFileEx(
HANDLE *phFile,
DWORD dwFlags,
DWORD dwReserved,
DWORD nNumberOfBytesToLockLow,
DWORD nNumberOfBytesToLockHigh,
LPOVERLAPPED lpOverlapped
){
UNUSED_PARAMETER(dwReserved);
UNUSED_PARAMETER(nNumberOfBytesToLockHigh);
/* If the caller wants a shared read lock, forward this call
** to winceLockFile */
if (lpOverlapped->Offset == (DWORD)SHARED_FIRST &&
dwFlags == 1 &&
nNumberOfBytesToLockLow == (DWORD)SHARED_SIZE){
return winceLockFile(phFile, SHARED_FIRST, 0, 1, 0);
}
return FALSE;
}
/*
** End of the special code for wince
*****************************************************************************/
#endif /* SQLITE_OS_WINCE */
/*****************************************************************************
** The next group of routines implement the I/O methods specified
** by the sqlite3_io_methods object.
******************************************************************************/
/*
** Some Microsoft compilers lack this definition.
*/
#ifndef INVALID_SET_FILE_POINTER
# define INVALID_SET_FILE_POINTER ((DWORD)-1)
#endif
/*
** Move the current position of the file handle passed as the first
** argument to offset iOffset within the file. If successful, return 0.
** Otherwise, set pFile->lastErrno and return non-zero.
*/
static int seekWinFile(winFile *pFile, sqlite3_int64 iOffset){
LONG upperBits; /* Most sig. 32 bits of new offset */
LONG lowerBits; /* Least sig. 32 bits of new offset */
DWORD dwRet; /* Value returned by SetFilePointer() */
DWORD lastErrno; /* Value returned by GetLastError() */
upperBits = (LONG)((iOffset>>32) & 0x7fffffff);
lowerBits = (LONG)(iOffset & 0xffffffff);
/* API oddity: If successful, SetFilePointer() returns a dword
** containing the lower 32-bits of the new file-offset. Or, if it fails,
** it returns INVALID_SET_FILE_POINTER. However according to MSDN,
** INVALID_SET_FILE_POINTER may also be a valid new offset. So to determine
** whether an error has actually occured, it is also necessary to call
** GetLastError().
*/
dwRet = osSetFilePointer(pFile->h, lowerBits, &upperBits, FILE_BEGIN);
if( (dwRet==INVALID_SET_FILE_POINTER
&& ((lastErrno = osGetLastError())!=NO_ERROR)) ){
pFile->lastErrno = lastErrno;
winLogError(SQLITE_IOERR_SEEK, pFile->lastErrno,
"seekWinFile", pFile->zPath);
return 1;
}
return 0;
}
/*
** Close a file.
**
** It is reported that an attempt to close a handle might sometimes
** fail. This is a very unreasonable result, but Windows is notorious
** for being unreasonable so I do not doubt that it might happen. If
** the close fails, we pause for 100 milliseconds and try again. As
** many as MX_CLOSE_ATTEMPT attempts to close the handle are made before
** giving up and returning an error.
*/
#define MX_CLOSE_ATTEMPT 3
static int winClose(sqlite3_file *id){
int rc, cnt = 0;
winFile *pFile = (winFile*)id;
assert( id!=0 );
assert( pFile->pShm==0 );
OSTRACE(("CLOSE %d\n", pFile->h));
do{
rc = osCloseHandle(pFile->h);
/* SimulateIOError( rc=0; cnt=MX_CLOSE_ATTEMPT; ); */
}while( rc==0 && ++cnt < MX_CLOSE_ATTEMPT && (osSleep(100), 1) );
#if SQLITE_OS_WINCE
#define WINCE_DELETION_ATTEMPTS 3
winceDestroyLock(pFile);
if( pFile->zDeleteOnClose ){
int cnt = 0;
while(
osDeleteFileW(pFile->zDeleteOnClose)==0
&& osGetFileAttributesW(pFile->zDeleteOnClose)!=0xffffffff
&& cnt++ < WINCE_DELETION_ATTEMPTS
){
osSleep(100); /* Wait a little before trying again */
}
sqlite3_free(pFile->zDeleteOnClose);
}
#endif
OSTRACE(("CLOSE %d %s\n", pFile->h, rc ? "ok" : "failed"));
if( rc ){
pFile->h = NULL;
}
OpenCounter(-1);
return rc ? SQLITE_OK
: winLogError(SQLITE_IOERR_CLOSE, osGetLastError(),
"winClose", pFile->zPath);
}
/*
** Read data from a file into a buffer. Return SQLITE_OK if all
** bytes were read successfully and SQLITE_IOERR if anything goes
** wrong.
*/
static int winRead(
sqlite3_file *id, /* File to read from */
void *pBuf, /* Write content into this buffer */
int amt, /* Number of bytes to read */
sqlite3_int64 offset /* Begin reading at this offset */
){
#if !SQLITE_OS_WINCE
OVERLAPPED overlapped; /* The offset for ReadFile. */
#endif
winFile *pFile = (winFile*)id; /* file handle */
DWORD nRead; /* Number of bytes actually read from file */
int nRetry = 0; /* Number of retrys */
assert( id!=0 );
SimulateIOError(return SQLITE_IOERR_READ);
OSTRACE(("READ %d lock=%d\n", pFile->h, pFile->locktype));
#if SQLITE_OS_WINCE
if( seekWinFile(pFile, offset) ){
return SQLITE_FULL;
}
while( !osReadFile(pFile->h, pBuf, amt, &nRead, 0) ){
#else
memset(&overlapped, 0, sizeof(OVERLAPPED));
overlapped.Offset = (LONG)(offset & 0xffffffff);
overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
while( !osReadFile(pFile->h, pBuf, amt, &nRead, &overlapped) &&
osGetLastError()!=ERROR_HANDLE_EOF ){
#endif
DWORD lastErrno;
if( retryIoerr(&nRetry, &lastErrno) ) continue;
pFile->lastErrno = lastErrno;
return winLogError(SQLITE_IOERR_READ, pFile->lastErrno,
"winRead", pFile->zPath);
}
logIoerr(nRetry);
if( nRead<(DWORD)amt ){
/* Unread parts of the buffer must be zero-filled */
memset(&((char*)pBuf)[nRead], 0, amt-nRead);
return SQLITE_IOERR_SHORT_READ;
}
return SQLITE_OK;
}
/*
** Write data from a buffer into a file. Return SQLITE_OK on success
** or some other error code on failure.
*/
static int winWrite(
sqlite3_file *id, /* File to write into */
const void *pBuf, /* The bytes to be written */
int amt, /* Number of bytes to write */
sqlite3_int64 offset /* Offset into the file to begin writing at */
){
int rc = 0; /* True if error has occured, else false */
winFile *pFile = (winFile*)id; /* File handle */
int nRetry = 0; /* Number of retries */
assert( amt>0 );
assert( pFile );
SimulateIOError(return SQLITE_IOERR_WRITE);
SimulateDiskfullError(return SQLITE_FULL);
OSTRACE(("WRITE %d lock=%d\n", pFile->h, pFile->locktype));
#if SQLITE_OS_WINCE
rc = seekWinFile(pFile, offset);
if( rc==0 ){
#else
{
#endif
#if !SQLITE_OS_WINCE
OVERLAPPED overlapped; /* The offset for WriteFile. */
#endif
u8 *aRem = (u8 *)pBuf; /* Data yet to be written */
int nRem = amt; /* Number of bytes yet to be written */
DWORD nWrite; /* Bytes written by each WriteFile() call */
DWORD lastErrno = NO_ERROR; /* Value returned by GetLastError() */
#if !SQLITE_OS_WINCE
memset(&overlapped, 0, sizeof(OVERLAPPED));
overlapped.Offset = (LONG)(offset & 0xffffffff);
overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
#endif
while( nRem>0 ){
#if SQLITE_OS_WINCE
if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, 0) ){
#else
if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, &overlapped) ){
#endif
if( retryIoerr(&nRetry, &lastErrno) ) continue;
break;
}
if( nWrite<=0 ){
lastErrno = osGetLastError();
break;
}
#if !SQLITE_OS_WINCE
offset += nWrite;
overlapped.Offset = (LONG)(offset & 0xffffffff);
overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
#endif
aRem += nWrite;
nRem -= nWrite;
}
if( nRem>0 ){
pFile->lastErrno = lastErrno;
rc = 1;
}
}
if( rc ){
if( ( pFile->lastErrno==ERROR_HANDLE_DISK_FULL )
|| ( pFile->lastErrno==ERROR_DISK_FULL )){
return SQLITE_FULL;
}
return winLogError(SQLITE_IOERR_WRITE, pFile->lastErrno,
"winWrite", pFile->zPath);
}else{
logIoerr(nRetry);
}
return SQLITE_OK;
}
/*
** Truncate an open file to a specified size
*/
static int winTruncate(sqlite3_file *id, sqlite3_int64 nByte){
winFile *pFile = (winFile*)id; /* File handle object */
int rc = SQLITE_OK; /* Return code for this function */
assert( pFile );
OSTRACE(("TRUNCATE %d %lld\n", pFile->h, nByte));
SimulateIOError(return SQLITE_IOERR_TRUNCATE);
/* If the user has configured a chunk-size for this file, truncate the
** file so that it consists of an integer number of chunks (i.e. the
** actual file size after the operation may be larger than the requested
** size).
*/
if( pFile->szChunk>0 ){
nByte = ((nByte + pFile->szChunk - 1)/pFile->szChunk) * pFile->szChunk;
}
/* SetEndOfFile() returns non-zero when successful, or zero when it fails. */
if( seekWinFile(pFile, nByte) ){
rc = winLogError(SQLITE_IOERR_TRUNCATE, pFile->lastErrno,
"winTruncate1", pFile->zPath);
}else if( 0==osSetEndOfFile(pFile->h) ){
pFile->lastErrno = osGetLastError();
rc = winLogError(SQLITE_IOERR_TRUNCATE, pFile->lastErrno,
"winTruncate2", pFile->zPath);
}
OSTRACE(("TRUNCATE %d %lld %s\n", pFile->h, nByte, rc ? "failed" : "ok"));
return rc;
}
#ifdef SQLITE_TEST
/*
** Count the number of fullsyncs and normal syncs. This is used to test
** that syncs and fullsyncs are occuring at the right times.
*/
int sqlite3_sync_count = 0;
int sqlite3_fullsync_count = 0;
#endif
/*
** Make sure all writes to a particular file are committed to disk.
*/
static int winSync(sqlite3_file *id, int flags){
#ifndef SQLITE_NO_SYNC
/*
** Used only when SQLITE_NO_SYNC is not defined.
*/
BOOL rc;
#endif
#if !defined(NDEBUG) || !defined(SQLITE_NO_SYNC) || \
(defined(SQLITE_TEST) && defined(SQLITE_DEBUG))
/*
** Used when SQLITE_NO_SYNC is not defined and by the assert() and/or
** OSTRACE() macros.
*/
winFile *pFile = (winFile*)id;
#else
UNUSED_PARAMETER(id);
#endif
assert( pFile );
/* Check that one of SQLITE_SYNC_NORMAL or FULL was passed */
assert((flags&0x0F)==SQLITE_SYNC_NORMAL
|| (flags&0x0F)==SQLITE_SYNC_FULL
);
OSTRACE(("SYNC %d lock=%d\n", pFile->h, pFile->locktype));
/* Unix cannot, but some systems may return SQLITE_FULL from here. This
** line is to test that doing so does not cause any problems.
*/
SimulateDiskfullError( return SQLITE_FULL );
#ifndef SQLITE_TEST
UNUSED_PARAMETER(flags);
#else
if( (flags&0x0F)==SQLITE_SYNC_FULL ){
sqlite3_fullsync_count++;
}
sqlite3_sync_count++;
#endif
/* If we compiled with the SQLITE_NO_SYNC flag, then syncing is a
** no-op
*/
#ifdef SQLITE_NO_SYNC
return SQLITE_OK;
#else
rc = osFlushFileBuffers(pFile->h);
SimulateIOError( rc=FALSE );
if( rc ){
return SQLITE_OK;
}else{
pFile->lastErrno = osGetLastError();
return winLogError(SQLITE_IOERR_FSYNC, pFile->lastErrno,
"winSync", pFile->zPath);
}
#endif
}
/*
** Determine the current size of a file in bytes
*/
static int winFileSize(sqlite3_file *id, sqlite3_int64 *pSize){
DWORD upperBits;
DWORD lowerBits;
winFile *pFile = (winFile*)id;
DWORD lastErrno;
assert( id!=0 );
SimulateIOError(return SQLITE_IOERR_FSTAT);
lowerBits = osGetFileSize(pFile->h, &upperBits);
if( (lowerBits == INVALID_FILE_SIZE)
&& ((lastErrno = osGetLastError())!=NO_ERROR) )
{
pFile->lastErrno = lastErrno;
return winLogError(SQLITE_IOERR_FSTAT, pFile->lastErrno,
"winFileSize", pFile->zPath);
}
*pSize = (((sqlite3_int64)upperBits)<<32) + lowerBits;
return SQLITE_OK;
}
/*
** LOCKFILE_FAIL_IMMEDIATELY is undefined on some Windows systems.
*/
#ifndef LOCKFILE_FAIL_IMMEDIATELY
# define LOCKFILE_FAIL_IMMEDIATELY 1
#endif
/*
** Acquire a reader lock.
** Different API routines are called depending on whether or not this
** is Win9x or WinNT.
*/
static int getReadLock(winFile *pFile){
int res;
if( isNT() ){
OVERLAPPED ovlp;
ovlp.Offset = SHARED_FIRST;
ovlp.OffsetHigh = 0;
ovlp.hEvent = 0;
res = osLockFileEx(pFile->h, LOCKFILE_FAIL_IMMEDIATELY,
0, SHARED_SIZE, 0, &ovlp);
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
*/
#if SQLITE_OS_WINCE==0
}else{
int lk;
sqlite3_randomness(sizeof(lk), &lk);
pFile->sharedLockByte = (short)((lk & 0x7fffffff)%(SHARED_SIZE - 1));
res = osLockFile(pFile->h, SHARED_FIRST+pFile->sharedLockByte, 0, 1, 0);
#endif
}
if( res == 0 ){
pFile->lastErrno = osGetLastError();
/* No need to log a failure to lock */
}
return res;
}
/*
** Undo a readlock
*/
static int unlockReadLock(winFile *pFile){
int res;
DWORD lastErrno;
if( isNT() ){
res = osUnlockFile(pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
*/
#if SQLITE_OS_WINCE==0
}else{
res = osUnlockFile(pFile->h, SHARED_FIRST + pFile->sharedLockByte, 0, 1, 0);
#endif
}
if( res==0 && ((lastErrno = osGetLastError())!=ERROR_NOT_LOCKED) ){
pFile->lastErrno = lastErrno;
winLogError(SQLITE_IOERR_UNLOCK, pFile->lastErrno,
"unlockReadLock", pFile->zPath);
}
return res;
}
/*
** 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 winUnlock() 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.
*/
static int winLock(sqlite3_file *id, int locktype){
int rc = SQLITE_OK; /* Return code from subroutines */
int res = 1; /* Result of a Windows lock call */
int newLocktype; /* Set pFile->locktype to this value before exiting */
int gotPendingLock = 0;/* True if we acquired a PENDING lock this time */
winFile *pFile = (winFile*)id;
DWORD lastErrno = NO_ERROR;
assert( id!=0 );
OSTRACE(("LOCK %d %d was %d(%d)\n",
pFile->h, locktype, pFile->locktype, pFile->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( pFile->locktype>=locktype ){
return SQLITE_OK;
}
/* Make sure the locking sequence is correct
*/
assert( pFile->locktype!=NO_LOCK || locktype==SHARED_LOCK );
assert( locktype!=PENDING_LOCK );
assert( locktype!=RESERVED_LOCK || pFile->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 = pFile->locktype;
if( (pFile->locktype==NO_LOCK)
|| ( (locktype==EXCLUSIVE_LOCK)
&& (pFile->locktype==RESERVED_LOCK))
){
int cnt = 3;
while( cnt-->0 && (res = osLockFile(pFile->h, PENDING_BYTE, 0, 1, 0))==0 ){
/* Try 3 times to get the pending lock. This is needed to work
** around problems caused by indexing and/or anti-virus software on
** Windows systems.
** If you are using this code as a model for alternative VFSes, do not
** copy this retry logic. It is a hack intended for Windows only.
*/
OSTRACE(("could not get a PENDING lock. cnt=%d\n", cnt));
if( cnt ) osSleep(1);
}
gotPendingLock = res;
if( !res ){
lastErrno = osGetLastError();
}
}
/* Acquire a shared lock
*/
if( locktype==SHARED_LOCK && res ){
assert( pFile->locktype==NO_LOCK );
res = getReadLock(pFile);
if( res ){
newLocktype = SHARED_LOCK;
}else{
lastErrno = osGetLastError();
}
}
/* Acquire a RESERVED lock
*/
if( locktype==RESERVED_LOCK && res ){
assert( pFile->locktype==SHARED_LOCK );
res = osLockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
if( res ){
newLocktype = RESERVED_LOCK;
}else{
lastErrno = osGetLastError();
}
}
/* Acquire a PENDING lock
*/
if( locktype==EXCLUSIVE_LOCK && res ){
newLocktype = PENDING_LOCK;
gotPendingLock = 0;
}
/* Acquire an EXCLUSIVE lock
*/
if( locktype==EXCLUSIVE_LOCK && res ){
assert( pFile->locktype>=SHARED_LOCK );
res = unlockReadLock(pFile);
OSTRACE(("unreadlock = %d\n", res));
res = osLockFile(pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
if( res ){
newLocktype = EXCLUSIVE_LOCK;
}else{
lastErrno = osGetLastError();
OSTRACE(("error-code = %d\n", lastErrno));
getReadLock(pFile);
}
}
/* If we are holding a PENDING lock that ought to be released, then
** release it now.
*/
if( gotPendingLock && locktype==SHARED_LOCK ){
osUnlockFile(pFile->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{
OSTRACE(("LOCK FAILED %d trying for %d but got %d\n", pFile->h,
locktype, newLocktype));
pFile->lastErrno = lastErrno;
rc = SQLITE_BUSY;
}
pFile->locktype = (u8)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.
*/
static int winCheckReservedLock(sqlite3_file *id, int *pResOut){
int rc;
winFile *pFile = (winFile*)id;
SimulateIOError( return SQLITE_IOERR_CHECKRESERVEDLOCK; );
assert( id!=0 );
if( pFile->locktype>=RESERVED_LOCK ){
rc = 1;
OSTRACE(("TEST WR-LOCK %d %d (local)\n", pFile->h, rc));
}else{
rc = osLockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
if( rc ){
osUnlockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
}
rc = !rc;
OSTRACE(("TEST WR-LOCK %d %d (remote)\n", pFile->h, rc));
}
*pResOut = rc;
return SQLITE_OK;
}
/*
** 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;
*/
static int winUnlock(sqlite3_file *id, int locktype){
int type;
winFile *pFile = (winFile*)id;
int rc = SQLITE_OK;
assert( pFile!=0 );
assert( locktype<=SHARED_LOCK );
OSTRACE(("UNLOCK %d to %d was %d(%d)\n", pFile->h, locktype,
pFile->locktype, pFile->sharedLockByte));
type = pFile->locktype;
if( type>=EXCLUSIVE_LOCK ){
osUnlockFile(pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
if( locktype==SHARED_LOCK && !getReadLock(pFile) ){
/* This should never happen. We should always be able to
** reacquire the read lock */
rc = winLogError(SQLITE_IOERR_UNLOCK, osGetLastError(),
"winUnlock", pFile->zPath);
}
}
if( type>=RESERVED_LOCK ){
osUnlockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
}
if( locktype==NO_LOCK && type>=SHARED_LOCK ){
unlockReadLock(pFile);
}
if( type>=PENDING_LOCK ){
osUnlockFile(pFile->h, PENDING_BYTE, 0, 1, 0);
}
pFile->locktype = (u8)locktype;
return rc;
}
/*
** If *pArg is inititially negative then this is a query. Set *pArg to
** 1 or 0 depending on whether or not bit mask of pFile->ctrlFlags is set.
**
** If *pArg is 0 or 1, then clear or set the mask bit of pFile->ctrlFlags.
*/
static void winModeBit(winFile *pFile, unsigned char mask, int *pArg){
if( *pArg<0 ){
*pArg = (pFile->ctrlFlags & mask)!=0;
}else if( (*pArg)==0 ){
pFile->ctrlFlags &= ~mask;
}else{
pFile->ctrlFlags |= mask;
}
}
/*
** Control and query of the open file handle.
*/
static int winFileControl(sqlite3_file *id, int op, void *pArg){
winFile *pFile = (winFile*)id;
switch( op ){
case SQLITE_FCNTL_LOCKSTATE: {
*(int*)pArg = pFile->locktype;
return SQLITE_OK;
}
case SQLITE_LAST_ERRNO: {
*(int*)pArg = (int)pFile->lastErrno;
return SQLITE_OK;
}
case SQLITE_FCNTL_CHUNK_SIZE: {
pFile->szChunk = *(int *)pArg;
return SQLITE_OK;
}
case SQLITE_FCNTL_SIZE_HINT: {
if( pFile->szChunk>0 ){
sqlite3_int64 oldSz;
int rc = winFileSize(id, &oldSz);
if( rc==SQLITE_OK ){
sqlite3_int64 newSz = *(sqlite3_int64*)pArg;
if( newSz>oldSz ){
SimulateIOErrorBenign(1);
rc = winTruncate(id, newSz);
SimulateIOErrorBenign(0);
}
}
return rc;
}
return SQLITE_OK;
}
case SQLITE_FCNTL_PERSIST_WAL: {
winModeBit(pFile, WINFILE_PERSIST_WAL, (int*)pArg);
return SQLITE_OK;
}
case SQLITE_FCNTL_POWERSAFE_OVERWRITE: {
winModeBit(pFile, WINFILE_PSOW, (int*)pArg);
return SQLITE_OK;
}
case SQLITE_FCNTL_VFSNAME: {
*(char**)pArg = sqlite3_mprintf("win32");
return SQLITE_OK;
}
case SQLITE_FCNTL_WIN32_AV_RETRY: {
int *a = (int*)pArg;
if( a[0]>0 ){
win32IoerrRetry = a[0];
}else{
a[0] = win32IoerrRetry;
}
if( a[1]>0 ){
win32IoerrRetryDelay = a[1];
}else{
a[1] = win32IoerrRetryDelay;
}
return SQLITE_OK;
}
}
return SQLITE_NOTFOUND;
}
/*
** Return the sector size in bytes of the underlying block device for
** the specified file. This is almost always 512 bytes, but may be
** larger for some devices.
**
** SQLite code assumes this function cannot fail. It also assumes that
** if two files are created in the same file-system directory (i.e.
** a database and its journal file) that the sector size will be the
** same for both.
*/
static int winSectorSize(sqlite3_file *id){
(void)id;
return SQLITE_DEFAULT_SECTOR_SIZE;
}
/*
** Return a vector of device characteristics.
*/
static int winDeviceCharacteristics(sqlite3_file *id){
winFile *p = (winFile*)id;
return SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN |
((p->ctrlFlags & WINFILE_PSOW)?SQLITE_IOCAP_POWERSAFE_OVERWRITE:0);
}
#ifndef SQLITE_OMIT_WAL
/*
** Windows will only let you create file view mappings
** on allocation size granularity boundaries.
** During sqlite3_os_init() we do a GetSystemInfo()
** to get the granularity size.
*/
SYSTEM_INFO winSysInfo;
/*
** Helper functions to obtain and relinquish the global mutex. The
** global mutex is used to protect the winLockInfo objects used by
** this file, all of which may be shared by multiple threads.
**
** Function winShmMutexHeld() is used to assert() that the global mutex
** is held when required. This function is only used as part of assert()
** statements. e.g.
**
** winShmEnterMutex()
** assert( winShmMutexHeld() );
** winShmLeaveMutex()
*/
static void winShmEnterMutex(void){
sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
static void winShmLeaveMutex(void){
sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
#ifdef SQLITE_DEBUG
static int winShmMutexHeld(void) {
return sqlite3_mutex_held(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
#endif
/*
** Object used to represent a single file opened and mmapped to provide
** shared memory. When multiple threads all reference the same
** log-summary, each thread has its own winFile object, but they all
** point to a single instance of this object. In other words, each
** log-summary is opened only once per process.
**
** winShmMutexHeld() must be true when creating or destroying
** this object or while reading or writing the following fields:
**
** nRef
** pNext
**
** The following fields are read-only after the object is created:
**
** fid
** zFilename
**
** Either winShmNode.mutex must be held or winShmNode.nRef==0 and
** winShmMutexHeld() is true when reading or writing any other field
** in this structure.
**
*/
struct winShmNode {
sqlite3_mutex *mutex; /* Mutex to access this object */
char *zFilename; /* Name of the file */
winFile hFile; /* File handle from winOpen */
int szRegion; /* Size of shared-memory regions */
int nRegion; /* Size of array apRegion */
struct ShmRegion {
HANDLE hMap; /* File handle from CreateFileMapping */
void *pMap;
} *aRegion;
DWORD lastErrno; /* The Windows errno from the last I/O error */
int nRef; /* Number of winShm objects pointing to this */
winShm *pFirst; /* All winShm objects pointing to this */
winShmNode *pNext; /* Next in list of all winShmNode objects */
#ifdef SQLITE_DEBUG
u8 nextShmId; /* Next available winShm.id value */
#endif
};
/*
** A global array of all winShmNode objects.
**
** The winShmMutexHeld() must be true while reading or writing this list.
*/
static winShmNode *winShmNodeList = 0;
/*
** Structure used internally by this VFS to record the state of an
** open shared memory connection.
**
** The following fields are initialized when this object is created and
** are read-only thereafter:
**
** winShm.pShmNode
** winShm.id
**
** All other fields are read/write. The winShm.pShmNode->mutex must be held
** while accessing any read/write fields.
*/
struct winShm {
winShmNode *pShmNode; /* The underlying winShmNode object */
winShm *pNext; /* Next winShm with the same winShmNode */
u8 hasMutex; /* True if holding the winShmNode mutex */
u16 sharedMask; /* Mask of shared locks held */
u16 exclMask; /* Mask of exclusive locks held */
#ifdef SQLITE_DEBUG
u8 id; /* Id of this connection with its winShmNode */
#endif
};
/*
** Constants used for locking
*/
#define WIN_SHM_BASE ((22+SQLITE_SHM_NLOCK)*4) /* first lock byte */
#define WIN_SHM_DMS (WIN_SHM_BASE+SQLITE_SHM_NLOCK) /* deadman switch */
/*
** Apply advisory locks for all n bytes beginning at ofst.
*/
#define _SHM_UNLCK 1
#define _SHM_RDLCK 2
#define _SHM_WRLCK 3
static int winShmSystemLock(
winShmNode *pFile, /* Apply locks to this open shared-memory segment */
int lockType, /* _SHM_UNLCK, _SHM_RDLCK, or _SHM_WRLCK */
int ofst, /* Offset to first byte to be locked/unlocked */
int nByte /* Number of bytes to lock or unlock */
){
OVERLAPPED ovlp;
DWORD dwFlags;
int rc = 0; /* Result code form Lock/UnlockFileEx() */
/* Access to the winShmNode object is serialized by the caller */
assert( sqlite3_mutex_held(pFile->mutex) || pFile->nRef==0 );
/* Initialize the locking parameters */
dwFlags = LOCKFILE_FAIL_IMMEDIATELY;
if( lockType == _SHM_WRLCK ) dwFlags |= LOCKFILE_EXCLUSIVE_LOCK;
memset(&ovlp, 0, sizeof(OVERLAPPED));
ovlp.Offset = ofst;
/* Release/Acquire the system-level lock */
if( lockType==_SHM_UNLCK ){
rc = osUnlockFileEx(pFile->hFile.h, 0, nByte, 0, &ovlp);
}else{
rc = osLockFileEx(pFile->hFile.h, dwFlags, 0, nByte, 0, &ovlp);
}
if( rc!= 0 ){
rc = SQLITE_OK;
}else{
pFile->lastErrno = osGetLastError();
rc = SQLITE_BUSY;
}
OSTRACE(("SHM-LOCK %d %s %s 0x%08lx\n",
pFile->hFile.h,
rc==SQLITE_OK ? "ok" : "failed",
lockType==_SHM_UNLCK ? "UnlockFileEx" : "LockFileEx",
pFile->lastErrno));
return rc;
}
/* Forward references to VFS methods */
static int winOpen(sqlite3_vfs*,const char*,sqlite3_file*,int,int*);
static int winDelete(sqlite3_vfs *,const char*,int);
/*
** Purge the winShmNodeList list of all entries with winShmNode.nRef==0.
**
** This is not a VFS shared-memory method; it is a utility function called
** by VFS shared-memory methods.
*/
static void winShmPurge(sqlite3_vfs *pVfs, int deleteFlag){
winShmNode **pp;
winShmNode *p;
BOOL bRc;
assert( winShmMutexHeld() );
pp = &winShmNodeList;
while( (p = *pp)!=0 ){
if( p->nRef==0 ){
int i;
if( p->mutex ) sqlite3_mutex_free(p->mutex);
for(i=0; i<p->nRegion; i++){
bRc = osUnmapViewOfFile(p->aRegion[i].pMap);
OSTRACE(("SHM-PURGE pid-%d unmap region=%d %s\n",
(int)osGetCurrentProcessId(), i,
bRc ? "ok" : "failed"));
bRc = osCloseHandle(p->aRegion[i].hMap);
OSTRACE(("SHM-PURGE pid-%d close region=%d %s\n",
(int)osGetCurrentProcessId(), i,
bRc ? "ok" : "failed"));
}
if( p->hFile.h != INVALID_HANDLE_VALUE ){
SimulateIOErrorBenign(1);
winClose((sqlite3_file *)&p->hFile);
SimulateIOErrorBenign(0);
}
if( deleteFlag ){
SimulateIOErrorBenign(1);
sqlite3BeginBenignMalloc();
winDelete(pVfs, p->zFilename, 0);
sqlite3EndBenignMalloc();
SimulateIOErrorBenign(0);
}
*pp = p->pNext;
sqlite3_free(p->aRegion);
sqlite3_free(p);
}else{
pp = &p->pNext;
}
}
}
/*
** Open the shared-memory area associated with database file pDbFd.
**
** When opening a new shared-memory file, if no other instances of that
** file are currently open, in this process or in other processes, then
** the file must be truncated to zero length or have its header cleared.
*/
static int winOpenSharedMemory(winFile *pDbFd){
struct winShm *p; /* The connection to be opened */
struct winShmNode *pShmNode = 0; /* The underlying mmapped file */
int rc; /* Result code */
struct winShmNode *pNew; /* Newly allocated winShmNode */
int nName; /* Size of zName in bytes */
assert( pDbFd->pShm==0 ); /* Not previously opened */
/* Allocate space for the new sqlite3_shm object. Also speculatively
** allocate space for a new winShmNode and filename.
*/
p = sqlite3_malloc( sizeof(*p) );
if( p==0 ) return SQLITE_IOERR_NOMEM;
memset(p, 0, sizeof(*p));
nName = sqlite3Strlen30(pDbFd->zPath);
pNew = sqlite3_malloc( sizeof(*pShmNode) + nName + 17 );
if( pNew==0 ){
sqlite3_free(p);
return SQLITE_IOERR_NOMEM;
}
memset(pNew, 0, sizeof(*pNew) + nName + 17);
pNew->zFilename = (char*)&pNew[1];
sqlite3_snprintf(nName+15, pNew->zFilename, "%s-shm", pDbFd->zPath);
sqlite3FileSuffix3(pDbFd->zPath, pNew->zFilename);
/* Look to see if there is an existing winShmNode that can be used.
** If no matching winShmNode currently exists, create a new one.
*/
winShmEnterMutex();
for(pShmNode = winShmNodeList; pShmNode; pShmNode=pShmNode->pNext){
/* TBD need to come up with better match here. Perhaps
** use FILE_ID_BOTH_DIR_INFO Structure.
*/
if( sqlite3StrICmp(pShmNode->zFilename, pNew->zFilename)==0 ) break;
}
if( pShmNode ){
sqlite3_free(pNew);
}else{
pShmNode = pNew;
pNew = 0;
((winFile*)(&pShmNode->hFile))->h = INVALID_HANDLE_VALUE;
pShmNode->pNext = winShmNodeList;
winShmNodeList = pShmNode;
pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
if( pShmNode->mutex==0 ){
rc = SQLITE_IOERR_NOMEM;
goto shm_open_err;
}
rc = winOpen(pDbFd->pVfs,
pShmNode->zFilename, /* Name of the file (UTF-8) */
(sqlite3_file*)&pShmNode->hFile, /* File handle here */
SQLITE_OPEN_WAL | SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, /* Mode flags */
0);
if( SQLITE_OK!=rc ){
goto shm_open_err;
}
/* Check to see if another process is holding the dead-man switch.
** If not, truncate the file to zero length.
*/
if( winShmSystemLock(pShmNode, _SHM_WRLCK, WIN_SHM_DMS, 1)==SQLITE_OK ){
rc = winTruncate((sqlite3_file *)&pShmNode->hFile, 0);
if( rc!=SQLITE_OK ){
rc = winLogError(SQLITE_IOERR_SHMOPEN, osGetLastError(),
"winOpenShm", pDbFd->zPath);
}
}
if( rc==SQLITE_OK ){
winShmSystemLock(pShmNode, _SHM_UNLCK, WIN_SHM_DMS, 1);
rc = winShmSystemLock(pShmNode, _SHM_RDLCK, WIN_SHM_DMS, 1);
}
if( rc ) goto shm_open_err;
}
/* Make the new connection a child of the winShmNode */
p->pShmNode = pShmNode;
#ifdef SQLITE_DEBUG
p->id = pShmNode->nextShmId++;
#endif
pShmNode->nRef++;
pDbFd->pShm = p;
winShmLeaveMutex();
/* The reference count on pShmNode has already been incremented under
** the cover of the winShmEnterMutex() mutex and the pointer from the
** new (struct winShm) object to the pShmNode has been set. All that is
** left to do is to link the new object into the linked list starting
** at pShmNode->pFirst. This must be done while holding the pShmNode->mutex
** mutex.
*/
sqlite3_mutex_enter(pShmNode->mutex);
p->pNext = pShmNode->pFirst;
pShmNode->pFirst = p;
sqlite3_mutex_leave(pShmNode->mutex);
return SQLITE_OK;
/* Jump here on any error */
shm_open_err:
winShmSystemLock(pShmNode, _SHM_UNLCK, WIN_SHM_DMS, 1);
winShmPurge(pDbFd->pVfs, 0); /* This call frees pShmNode if required */
sqlite3_free(p);
sqlite3_free(pNew);
winShmLeaveMutex();
return rc;
}
/*
** Close a connection to shared-memory. Delete the underlying
** storage if deleteFlag is true.
*/
static int winShmUnmap(
sqlite3_file *fd, /* Database holding shared memory */
int deleteFlag /* Delete after closing if true */
){
winFile *pDbFd; /* Database holding shared-memory */
winShm *p; /* The connection to be closed */
winShmNode *pShmNode; /* The underlying shared-memory file */
winShm **pp; /* For looping over sibling connections */
pDbFd = (winFile*)fd;
p = pDbFd->pShm;
if( p==0 ) return SQLITE_OK;
pShmNode = p->pShmNode;
/* Remove connection p from the set of connections associated
** with pShmNode */
sqlite3_mutex_enter(pShmNode->mutex);
for(pp=&pShmNode->pFirst; (*pp)!=p; pp = &(*pp)->pNext){}
*pp = p->pNext;
/* Free the connection p */
sqlite3_free(p);
pDbFd->pShm = 0;
sqlite3_mutex_leave(pShmNode->mutex);
/* If pShmNode->nRef has reached 0, then close the underlying
** shared-memory file, too */
winShmEnterMutex();
assert( pShmNode->nRef>0 );
pShmNode->nRef--;
if( pShmNode->nRef==0 ){
winShmPurge(pDbFd->pVfs, deleteFlag);
}
winShmLeaveMutex();
return SQLITE_OK;
}
/*
** Change the lock state for a shared-memory segment.
*/
static int winShmLock(
sqlite3_file *fd, /* Database file holding the shared memory */
int ofst, /* First lock to acquire or release */
int n, /* Number of locks to acquire or release */
int flags /* What to do with the lock */
){
winFile *pDbFd = (winFile*)fd; /* Connection holding shared memory */
winShm *p = pDbFd->pShm; /* The shared memory being locked */
winShm *pX; /* For looping over all siblings */
winShmNode *pShmNode = p->pShmNode;
int rc = SQLITE_OK; /* Result code */
u16 mask; /* Mask of locks to take or release */
assert( ofst>=0 && ofst+n<=SQLITE_SHM_NLOCK );
assert( n>=1 );
assert( flags==(SQLITE_SHM_LOCK | SQLITE_SHM_SHARED)
|| flags==(SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE)
|| flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED)
|| flags==(SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE) );
assert( n==1 || (flags & SQLITE_SHM_EXCLUSIVE)!=0 );
mask = (u16)((1U<<(ofst+n)) - (1U<<ofst));
assert( n>1 || mask==(1<<ofst) );
sqlite3_mutex_enter(pShmNode->mutex);
if( flags & SQLITE_SHM_UNLOCK ){
u16 allMask = 0; /* Mask of locks held by siblings */
/* See if any siblings hold this same lock */
for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
if( pX==p ) continue;
assert( (pX->exclMask & (p->exclMask|p->sharedMask))==0 );
allMask |= pX->sharedMask;
}
/* Unlock the system-level locks */
if( (mask & allMask)==0 ){
rc = winShmSystemLock(pShmNode, _SHM_UNLCK, ofst+WIN_SHM_BASE, n);
}else{
rc = SQLITE_OK;
}
/* Undo the local locks */
if( rc==SQLITE_OK ){
p->exclMask &= ~mask;
p->sharedMask &= ~mask;
}
}else if( flags & SQLITE_SHM_SHARED ){
u16 allShared = 0; /* Union of locks held by connections other than "p" */
/* Find out which shared locks are already held by sibling connections.
** If any sibling already holds an exclusive lock, go ahead and return
** SQLITE_BUSY.
*/
for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
if( (pX->exclMask & mask)!=0 ){
rc = SQLITE_BUSY;
break;
}
allShared |= pX->sharedMask;
}
/* Get shared locks at the system level, if necessary */
if( rc==SQLITE_OK ){
if( (allShared & mask)==0 ){
rc = winShmSystemLock(pShmNode, _SHM_RDLCK, ofst+WIN_SHM_BASE, n);
}else{
rc = SQLITE_OK;
}
}
/* Get the local shared locks */
if( rc==SQLITE_OK ){
p->sharedMask |= mask;
}
}else{
/* Make sure no sibling connections hold locks that will block this
** lock. If any do, return SQLITE_BUSY right away.
*/
for(pX=pShmNode->pFirst; pX; pX=pX->pNext){
if( (pX->exclMask & mask)!=0 || (pX->sharedMask & mask)!=0 ){
rc = SQLITE_BUSY;
break;
}
}
/* Get the exclusive locks at the system level. Then if successful
** also mark the local connection as being locked.
*/
if( rc==SQLITE_OK ){
rc = winShmSystemLock(pShmNode, _SHM_WRLCK, ofst+WIN_SHM_BASE, n);
if( rc==SQLITE_OK ){
assert( (p->sharedMask & mask)==0 );
p->exclMask |= mask;
}
}
}
sqlite3_mutex_leave(pShmNode->mutex);
OSTRACE(("SHM-LOCK shmid-%d, pid-%d got %03x,%03x %s\n",
p->id, (int)osGetCurrentProcessId(), p->sharedMask, p->exclMask,
rc ? "failed" : "ok"));
return rc;
}
/*
** Implement a memory barrier or memory fence on shared memory.
**
** All loads and stores begun before the barrier must complete before
** any load or store begun after the barrier.
*/
static void winShmBarrier(
sqlite3_file *fd /* Database holding the shared memory */
){
UNUSED_PARAMETER(fd);
/* MemoryBarrier(); // does not work -- do not know why not */
winShmEnterMutex();
winShmLeaveMutex();
}
/*
** This function is called to obtain a pointer to region iRegion of the
** shared-memory associated with the database file fd. Shared-memory regions
** are numbered starting from zero. Each shared-memory region is szRegion
** bytes in size.
**
** If an error occurs, an error code is returned and *pp is set to NULL.
**
** Otherwise, if the isWrite parameter is 0 and the requested shared-memory
** region has not been allocated (by any client, including one running in a
** separate process), then *pp is set to NULL and SQLITE_OK returned. If
** isWrite is non-zero and the requested shared-memory region has not yet
** been allocated, it is allocated by this function.
**
** If the shared-memory region has already been allocated or is allocated by
** this call as described above, then it is mapped into this processes
** address space (if it is not already), *pp is set to point to the mapped
** memory and SQLITE_OK returned.
*/
static int winShmMap(
sqlite3_file *fd, /* Handle open on database file */
int iRegion, /* Region to retrieve */
int szRegion, /* Size of regions */
int isWrite, /* True to extend file if necessary */
void volatile **pp /* OUT: Mapped memory */
){
winFile *pDbFd = (winFile*)fd;
winShm *p = pDbFd->pShm;
winShmNode *pShmNode;
int rc = SQLITE_OK;
if( !p ){
rc = winOpenSharedMemory(pDbFd);
if( rc!=SQLITE_OK ) return rc;
p = pDbFd->pShm;
}
pShmNode = p->pShmNode;
sqlite3_mutex_enter(pShmNode->mutex);
assert( szRegion==pShmNode->szRegion || pShmNode->nRegion==0 );
if( pShmNode->nRegion<=iRegion ){
struct ShmRegion *apNew; /* New aRegion[] array */
int nByte = (iRegion+1)*szRegion; /* Minimum required file size */
sqlite3_int64 sz; /* Current size of wal-index file */
pShmNode->szRegion = szRegion;
/* The requested region is not mapped into this processes address space.
** Check to see if it has been allocated (i.e. if the wal-index file is
** large enough to contain the requested region).
*/
rc = winFileSize((sqlite3_file *)&pShmNode->hFile, &sz);
if( rc!=SQLITE_OK ){
rc = winLogError(SQLITE_IOERR_SHMSIZE, osGetLastError(),
"winShmMap1", pDbFd->zPath);
goto shmpage_out;
}
if( sz<nByte ){
/* The requested memory region does not exist. If isWrite is set to
** zero, exit early. *pp will be set to NULL and SQLITE_OK returned.
**
** Alternatively, if isWrite is non-zero, use ftruncate() to allocate
** the requested memory region.
*/
if( !isWrite ) goto shmpage_out;
rc = winTruncate((sqlite3_file *)&pShmNode->hFile, nByte);
if( rc!=SQLITE_OK ){
rc = winLogError(SQLITE_IOERR_SHMSIZE, osGetLastError(),
"winShmMap2", pDbFd->zPath);
goto shmpage_out;
}
}
/* Map the requested memory region into this processes address space. */
apNew = (struct ShmRegion *)sqlite3_realloc(
pShmNode->aRegion, (iRegion+1)*sizeof(apNew[0])
);
if( !apNew ){
rc = SQLITE_IOERR_NOMEM;
goto shmpage_out;
}
pShmNode->aRegion = apNew;
while( pShmNode->nRegion<=iRegion ){
HANDLE hMap; /* file-mapping handle */
void *pMap = 0; /* Mapped memory region */
hMap = osCreateFileMapping(pShmNode->hFile.h,
NULL, PAGE_READWRITE, 0, nByte, NULL
);
OSTRACE(("SHM-MAP pid-%d create region=%d nbyte=%d %s\n",
(int)osGetCurrentProcessId(), pShmNode->nRegion, nByte,
hMap ? "ok" : "failed"));
if( hMap ){
int iOffset = pShmNode->nRegion*szRegion;
int iOffsetShift = iOffset % winSysInfo.dwAllocationGranularity;
pMap = osMapViewOfFile(hMap, FILE_MAP_WRITE | FILE_MAP_READ,
0, iOffset - iOffsetShift, szRegion + iOffsetShift
);
OSTRACE(("SHM-MAP pid-%d map region=%d offset=%d size=%d %s\n",
(int)osGetCurrentProcessId(), pShmNode->nRegion, iOffset,
szRegion, pMap ? "ok" : "failed"));
}
if( !pMap ){
pShmNode->lastErrno = osGetLastError();
rc = winLogError(SQLITE_IOERR_SHMMAP, pShmNode->lastErrno,
"winShmMap3", pDbFd->zPath);
if( hMap ) osCloseHandle(hMap);
goto shmpage_out;
}
pShmNode->aRegion[pShmNode->nRegion].pMap = pMap;
pShmNode->aRegion[pShmNode->nRegion].hMap = hMap;
pShmNode->nRegion++;
}
}
shmpage_out:
if( pShmNode->nRegion>iRegion ){
int iOffset = iRegion*szRegion;
int iOffsetShift = iOffset % winSysInfo.dwAllocationGranularity;
char *p = (char *)pShmNode->aRegion[iRegion].pMap;
*pp = (void *)&p[iOffsetShift];
}else{
*pp = 0;
}
sqlite3_mutex_leave(pShmNode->mutex);
return rc;
}
#else
# define winShmMap 0
# define winShmLock 0
# define winShmBarrier 0
# define winShmUnmap 0
#endif /* #ifndef SQLITE_OMIT_WAL */
/*
** Here ends the implementation of all sqlite3_file methods.
**
********************** End sqlite3_file Methods *******************************
******************************************************************************/
/*
** This vector defines all the methods that can operate on an
** sqlite3_file for win32.
*/
static const sqlite3_io_methods winIoMethod = {
2, /* iVersion */
winClose, /* xClose */
winRead, /* xRead */
winWrite, /* xWrite */
winTruncate, /* xTruncate */
winSync, /* xSync */
winFileSize, /* xFileSize */
winLock, /* xLock */
winUnlock, /* xUnlock */
winCheckReservedLock, /* xCheckReservedLock */
winFileControl, /* xFileControl */
winSectorSize, /* xSectorSize */
winDeviceCharacteristics, /* xDeviceCharacteristics */
winShmMap, /* xShmMap */
winShmLock, /* xShmLock */
winShmBarrier, /* xShmBarrier */
winShmUnmap /* xShmUnmap */
};
/****************************************************************************
**************************** sqlite3_vfs methods ****************************
**
** This division contains the implementation of methods on the
** sqlite3_vfs object.
*/
/*
** Convert a UTF-8 filename into whatever form the underlying
** operating system wants filenames in. Space to hold the result
** is obtained from malloc and must be freed by the calling
** function.
*/
static void *convertUtf8Filename(const char *zFilename){
void *zConverted = 0;
if( isNT() ){
zConverted = utf8ToUnicode(zFilename);
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
*/
#if SQLITE_OS_WINCE==0
}else{
zConverted = sqlite3_win32_utf8_to_mbcs(zFilename);
#endif
}
/* caller will handle out of memory */
return zConverted;
}
/*
** Create a temporary file name in zBuf. zBuf must be big enough to
** hold at pVfs->mxPathname characters.
*/
static int getTempname(int nBuf, char *zBuf){
static char zChars[] =
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789";
size_t i, j;
char zTempPath[MAX_PATH+2];
/* It's odd to simulate an io-error here, but really this is just
** using the io-error infrastructure to test that SQLite handles this
** function failing.
*/
SimulateIOError( return SQLITE_IOERR );
if( sqlite3_temp_directory ){
sqlite3_snprintf(MAX_PATH-30, zTempPath, "%s", sqlite3_temp_directory);
}else if( isNT() ){
char *zMulti;
WCHAR zWidePath[MAX_PATH];
osGetTempPathW(MAX_PATH-30, zWidePath);
zMulti = unicodeToUtf8(zWidePath);
if( zMulti ){
sqlite3_snprintf(MAX_PATH-30, zTempPath, "%s", zMulti);
sqlite3_free(zMulti);
}else{
return SQLITE_IOERR_NOMEM;
}
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
** Since the ANSI version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
}else{
char *zUtf8;
char zMbcsPath[MAX_PATH];
osGetTempPathA(MAX_PATH-30, zMbcsPath);
zUtf8 = sqlite3_win32_mbcs_to_utf8(zMbcsPath);
if( zUtf8 ){
sqlite3_snprintf(MAX_PATH-30, zTempPath, "%s", zUtf8);
sqlite3_free(zUtf8);
}else{
return SQLITE_IOERR_NOMEM;
}
#endif
}
/* Check that the output buffer is large enough for the temporary file
** name. If it is not, return SQLITE_ERROR.
*/
if( (sqlite3Strlen30(zTempPath) + sqlite3Strlen30(SQLITE_TEMP_FILE_PREFIX) + 18) >= nBuf ){
return SQLITE_ERROR;
}
for(i=sqlite3Strlen30(zTempPath); i>0 && zTempPath[i-1]=='\\'; i--){}
zTempPath[i] = 0;
sqlite3_snprintf(nBuf-18, zBuf,
"%s\\"SQLITE_TEMP_FILE_PREFIX, zTempPath);
j = sqlite3Strlen30(zBuf);
sqlite3_randomness(15, &zBuf[j]);
for(i=0; i<15; i++, j++){
zBuf[j] = (char)zChars[ ((unsigned char)zBuf[j])%(sizeof(zChars)-1) ];
}
zBuf[j] = 0;
zBuf[j+1] = 0;
OSTRACE(("TEMP FILENAME: %s\n", zBuf));
return SQLITE_OK;
}
/*
** Return TRUE if the named file is really a directory. Return false if
** it is something other than a directory, or if there is any kind of memory
** allocation failure.
*/
static int winIsDir(const void *zConverted){
DWORD attr;
int rc = 0;
DWORD lastErrno;
if( isNT() ){
int cnt = 0;
WIN32_FILE_ATTRIBUTE_DATA sAttrData;
memset(&sAttrData, 0, sizeof(sAttrData));
while( !(rc = osGetFileAttributesExW((LPCWSTR)zConverted,
GetFileExInfoStandard,
&sAttrData)) && retryIoerr(&cnt, &lastErrno) ){}
if( !rc ){
return 0; /* Invalid name? */
}
attr = sAttrData.dwFileAttributes;
#if SQLITE_OS_WINCE==0
}else{
attr = osGetFileAttributesA((char*)zConverted);
#endif
}
return (attr!=INVALID_FILE_ATTRIBUTES) && (attr&FILE_ATTRIBUTE_DIRECTORY);
}
/*
** Open a file.
*/
static int winOpen(
sqlite3_vfs *pVfs, /* Not used */
const char *zName, /* Name of the file (UTF-8) */
sqlite3_file *id, /* Write the SQLite file handle here */
int flags, /* Open mode flags */
int *pOutFlags /* Status return flags */
){
HANDLE h;
DWORD lastErrno;
DWORD dwDesiredAccess;
DWORD dwShareMode;
DWORD dwCreationDisposition;
DWORD dwFlagsAndAttributes = 0;
#if SQLITE_OS_WINCE
int isTemp = 0;
#endif
winFile *pFile = (winFile*)id;
void *zConverted; /* Filename in OS encoding */
const char *zUtf8Name = zName; /* Filename in UTF-8 encoding */
int cnt = 0;
/* If argument zPath is a NULL pointer, this function is required to open
** a temporary file. Use this buffer to store the file name in.
*/
char zTmpname[MAX_PATH+2]; /* Buffer used to create temp filename */
int rc = SQLITE_OK; /* Function Return Code */
#if !defined(NDEBUG) || SQLITE_OS_WINCE
int eType = flags&0xFFFFFF00; /* Type of file to open */
#endif
int isExclusive = (flags & SQLITE_OPEN_EXCLUSIVE);
int isDelete = (flags & SQLITE_OPEN_DELETEONCLOSE);
int isCreate = (flags & SQLITE_OPEN_CREATE);
#ifndef NDEBUG
int isReadonly = (flags & SQLITE_OPEN_READONLY);
#endif
int isReadWrite = (flags & SQLITE_OPEN_READWRITE);
#ifndef NDEBUG
int isOpenJournal = (isCreate && (
eType==SQLITE_OPEN_MASTER_JOURNAL
|| eType==SQLITE_OPEN_MAIN_JOURNAL
|| eType==SQLITE_OPEN_WAL
));
#endif
/* Check the following statements are true:
**
** (a) Exactly one of the READWRITE and READONLY flags must be set, and
** (b) if CREATE is set, then READWRITE must also be set, and
** (c) if EXCLUSIVE is set, then CREATE must also be set.
** (d) if DELETEONCLOSE is set, then CREATE must also be set.
*/
assert((isReadonly==0 || isReadWrite==0) && (isReadWrite || isReadonly));
assert(isCreate==0 || isReadWrite);
assert(isExclusive==0 || isCreate);
assert(isDelete==0 || isCreate);
/* The main DB, main journal, WAL file and master journal are never
** automatically deleted. Nor are they ever temporary files. */
assert( (!isDelete && zName) || eType!=SQLITE_OPEN_MAIN_DB );
assert( (!isDelete && zName) || eType!=SQLITE_OPEN_MAIN_JOURNAL );
assert( (!isDelete && zName) || eType!=SQLITE_OPEN_MASTER_JOURNAL );
assert( (!isDelete && zName) || eType!=SQLITE_OPEN_WAL );
/* Assert that the upper layer has set one of the "file-type" flags. */
assert( eType==SQLITE_OPEN_MAIN_DB || eType==SQLITE_OPEN_TEMP_DB
|| eType==SQLITE_OPEN_MAIN_JOURNAL || eType==SQLITE_OPEN_TEMP_JOURNAL
|| eType==SQLITE_OPEN_SUBJOURNAL || eType==SQLITE_OPEN_MASTER_JOURNAL
|| eType==SQLITE_OPEN_TRANSIENT_DB || eType==SQLITE_OPEN_WAL
);
assert( id!=0 );
UNUSED_PARAMETER(pVfs);
pFile->h = INVALID_HANDLE_VALUE;
/* If the second argument to this function is NULL, generate a
** temporary file name to use
*/
if( !zUtf8Name ){
assert(isDelete && !isOpenJournal);
rc = getTempname(MAX_PATH+2, zTmpname);
if( rc!=SQLITE_OK ){
return rc;
}
zUtf8Name = zTmpname;
}
/* Database filenames are double-zero terminated if they are not
** URIs with parameters. Hence, they can always be passed into
** sqlite3_uri_parameter().
*/
assert( (eType!=SQLITE_OPEN_MAIN_DB) || (flags & SQLITE_OPEN_URI) ||
zUtf8Name[strlen(zUtf8Name)+1]==0 );
/* Convert the filename to the system encoding. */
zConverted = convertUtf8Filename(zUtf8Name);
if( zConverted==0 ){
return SQLITE_IOERR_NOMEM;
}
if( winIsDir(zConverted) ){
sqlite3_free(zConverted);
return SQLITE_CANTOPEN_ISDIR;
}
if( isReadWrite ){
dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
}else{
dwDesiredAccess = GENERIC_READ;
}
/* SQLITE_OPEN_EXCLUSIVE is used to make sure that a new file is
** created. SQLite doesn't use it to indicate "exclusive access"
** as it is usually understood.
*/
if( isExclusive ){
/* Creates a new file, only if it does not already exist. */
/* If the file exists, it fails. */
dwCreationDisposition = CREATE_NEW;
}else if( isCreate ){
/* Open existing file, or create if it doesn't exist */
dwCreationDisposition = OPEN_ALWAYS;
}else{
/* Opens a file, only if it exists. */
dwCreationDisposition = OPEN_EXISTING;
}
dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
if( isDelete ){
#if SQLITE_OS_WINCE
dwFlagsAndAttributes = FILE_ATTRIBUTE_HIDDEN;
isTemp = 1;
#else
dwFlagsAndAttributes = FILE_ATTRIBUTE_TEMPORARY
| FILE_ATTRIBUTE_HIDDEN
| FILE_FLAG_DELETE_ON_CLOSE;
#endif
}else{
dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
}
/* Reports from the internet are that performance is always
** better if FILE_FLAG_RANDOM_ACCESS is used. Ticket #2699. */
#if SQLITE_OS_WINCE
dwFlagsAndAttributes |= FILE_FLAG_RANDOM_ACCESS;
#endif
if( isNT() ){
while( (h = osCreateFileW((LPCWSTR)zConverted,
dwDesiredAccess,
dwShareMode, NULL,
dwCreationDisposition,
dwFlagsAndAttributes,
NULL))==INVALID_HANDLE_VALUE &&
retryIoerr(&cnt, &lastErrno) ){
/* Noop */
}
#if SQLITE_OS_WINCE==0
}else{
while( (h = osCreateFileA((LPCSTR)zConverted,
dwDesiredAccess,
dwShareMode, NULL,
dwCreationDisposition,
dwFlagsAndAttributes,
NULL))==INVALID_HANDLE_VALUE &&
retryIoerr(&cnt, &lastErrno) ){
/* Noop */
}
#endif
}
logIoerr(cnt);
OSTRACE(("OPEN %d %s 0x%lx %s\n",
h, zName, dwDesiredAccess,
h==INVALID_HANDLE_VALUE ? "failed" : "ok"));
if( h==INVALID_HANDLE_VALUE ){
pFile->lastErrno = lastErrno;
winLogError(SQLITE_CANTOPEN, pFile->lastErrno, "winOpen", zUtf8Name);
sqlite3_free(zConverted);
if( isReadWrite && !isExclusive ){
return winOpen(pVfs, zName, id,
((flags|SQLITE_OPEN_READONLY)&~(SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE)), pOutFlags);
}else{
return SQLITE_CANTOPEN_BKPT;
}
}
if( pOutFlags ){
if( isReadWrite ){
*pOutFlags = SQLITE_OPEN_READWRITE;
}else{
*pOutFlags = SQLITE_OPEN_READONLY;
}
}
memset(pFile, 0, sizeof(*pFile));
pFile->pMethod = &winIoMethod;
pFile->h = h;
pFile->lastErrno = NO_ERROR;
pFile->pVfs = pVfs;
pFile->pShm = 0;
pFile->zPath = zName;
if( sqlite3_uri_boolean(zName, "psow", SQLITE_POWERSAFE_OVERWRITE) ){
pFile->ctrlFlags |= WINFILE_PSOW;
}
#if SQLITE_OS_WINCE
if( isReadWrite && eType==SQLITE_OPEN_MAIN_DB
&& !winceCreateLock(zName, pFile)
){
osCloseHandle(h);
sqlite3_free(zConverted);
return SQLITE_CANTOPEN_BKPT;
}
if( isTemp ){
pFile->zDeleteOnClose = zConverted;
}else
#endif
{
sqlite3_free(zConverted);
}
OpenCounter(+1);
return rc;
}
/*
** Delete the named file.
**
** Note that Windows does not allow a file to be deleted if some other
** process has it open. Sometimes a virus scanner or indexing program
** will open a journal file shortly after it is created in order to do
** whatever it does. While this other process is holding the
** file open, we will be unable to delete it. To work around this
** problem, we delay 100 milliseconds and try to delete again. Up
** to MX_DELETION_ATTEMPTs deletion attempts are run before giving
** up and returning an error.
*/
static int winDelete(
sqlite3_vfs *pVfs, /* Not used on win32 */
const char *zFilename, /* Name of file to delete */
int syncDir /* Not used on win32 */
){
int cnt = 0;
int rc;
DWORD attr;
DWORD lastErrno;
void *zConverted;
UNUSED_PARAMETER(pVfs);
UNUSED_PARAMETER(syncDir);
SimulateIOError(return SQLITE_IOERR_DELETE);
zConverted = convertUtf8Filename(zFilename);
if( zConverted==0 ){
return SQLITE_IOERR_NOMEM;
}
if( isNT() ){
do {
attr = osGetFileAttributesW(zConverted);
if ( attr==INVALID_FILE_ATTRIBUTES ){
rc = SQLITE_OK; /* Already gone? */
break;
}
if ( attr&FILE_ATTRIBUTE_DIRECTORY ){
rc = SQLITE_ERROR; /* Files only. */
break;
}
if ( osDeleteFileW(zConverted) ){
rc = SQLITE_OK; /* Deleted OK. */
break;
}
if ( !retryIoerr(&cnt, &lastErrno) ){
rc = SQLITE_ERROR; /* No more retries. */
break;
}
} while(1);
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
** Since the ANSI version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
}else{
do {
attr = osGetFileAttributesA(zConverted);
if ( attr==INVALID_FILE_ATTRIBUTES ){
rc = SQLITE_OK; /* Already gone? */
break;
}
if ( attr&FILE_ATTRIBUTE_DIRECTORY ){
rc = SQLITE_ERROR; /* Files only. */
break;
}
if ( osDeleteFileA(zConverted) ){
rc = SQLITE_OK; /* Deleted OK. */
break;
}
if ( !retryIoerr(&cnt, &lastErrno) ){
rc = SQLITE_ERROR; /* No more retries. */
break;
}
} while(1);
#endif
}
if( rc ){
rc = winLogError(SQLITE_IOERR_DELETE, lastErrno,
"winDelete", zFilename);
}else{
logIoerr(cnt);
}
sqlite3_free(zConverted);
OSTRACE(("DELETE \"%s\" %s\n", zFilename, (rc ? "failed" : "ok" )));
return rc;
}
/*
** Check the existance and status of a file.
*/
static int winAccess(
sqlite3_vfs *pVfs, /* Not used on win32 */
const char *zFilename, /* Name of file to check */
int flags, /* Type of test to make on this file */
int *pResOut /* OUT: Result */
){
DWORD attr;
int rc = 0;
DWORD lastErrno;
void *zConverted;
UNUSED_PARAMETER(pVfs);
SimulateIOError( return SQLITE_IOERR_ACCESS; );
zConverted = convertUtf8Filename(zFilename);
if( zConverted==0 ){
return SQLITE_IOERR_NOMEM;
}
if( isNT() ){
int cnt = 0;
WIN32_FILE_ATTRIBUTE_DATA sAttrData;
memset(&sAttrData, 0, sizeof(sAttrData));
while( !(rc = osGetFileAttributesExW((LPCWSTR)zConverted,
GetFileExInfoStandard,
&sAttrData)) && retryIoerr(&cnt, &lastErrno) ){}
if( rc ){
/* For an SQLITE_ACCESS_EXISTS query, treat a zero-length file
** as if it does not exist.
*/
if( flags==SQLITE_ACCESS_EXISTS
&& sAttrData.nFileSizeHigh==0
&& sAttrData.nFileSizeLow==0 ){
attr = INVALID_FILE_ATTRIBUTES;
}else{
attr = sAttrData.dwFileAttributes;
}
}else{
logIoerr(cnt);
if( lastErrno!=ERROR_FILE_NOT_FOUND ){
winLogError(SQLITE_IOERR_ACCESS, lastErrno, "winAccess", zFilename);
sqlite3_free(zConverted);
return SQLITE_IOERR_ACCESS;
}else{
attr = INVALID_FILE_ATTRIBUTES;
}
}
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
** Since the ANSI version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
}else{
attr = osGetFileAttributesA((char*)zConverted);
#endif
}
sqlite3_free(zConverted);
switch( flags ){
case SQLITE_ACCESS_READ:
case SQLITE_ACCESS_EXISTS:
rc = attr!=INVALID_FILE_ATTRIBUTES;
break;
case SQLITE_ACCESS_READWRITE:
rc = attr!=INVALID_FILE_ATTRIBUTES &&
(attr & FILE_ATTRIBUTE_READONLY)==0;
break;
default:
assert(!"Invalid flags argument");
}
*pResOut = rc;
return SQLITE_OK;
}
/*
** Turn a relative pathname into a full pathname. Write the full
** pathname into zOut[]. zOut[] will be at least pVfs->mxPathname
** bytes in size.
*/
static int winFullPathname(
sqlite3_vfs *pVfs, /* Pointer to vfs object */
const char *zRelative, /* Possibly relative input path */
int nFull, /* Size of output buffer in bytes */
char *zFull /* Output buffer */
){
#if defined(__CYGWIN__)
SimulateIOError( return SQLITE_ERROR );
UNUSED_PARAMETER(nFull);
cygwin_conv_to_full_win32_path(zRelative, zFull);
return SQLITE_OK;
#endif
#if SQLITE_OS_WINCE
SimulateIOError( return SQLITE_ERROR );
UNUSED_PARAMETER(nFull);
/* WinCE has no concept of a relative pathname, or so I am told. */
sqlite3_snprintf(pVfs->mxPathname, zFull, "%s", zRelative);
return SQLITE_OK;
#endif
#if !SQLITE_OS_WINCE && !defined(__CYGWIN__)
int nByte;
void *zConverted;
char *zOut;
/* If this path name begins with "/X:", where "X" is any alphabetic
** character, discard the initial "/" from the pathname.
*/
if( zRelative[0]=='/' && sqlite3Isalpha(zRelative[1]) && zRelative[2]==':' ){
zRelative++;
}
/* It's odd to simulate an io-error here, but really this is just
** using the io-error infrastructure to test that SQLite handles this
** function failing. This function could fail if, for example, the
** current working directory has been unlinked.
*/
SimulateIOError( return SQLITE_ERROR );
UNUSED_PARAMETER(nFull);
zConverted = convertUtf8Filename(zRelative);
if( zConverted==0 ){
return SQLITE_IOERR_NOMEM;
}
if( isNT() ){
LPWSTR zTemp;
nByte = osGetFullPathNameW((LPCWSTR)zConverted, 0, 0, 0) + 3;
zTemp = sqlite3_malloc( nByte*sizeof(zTemp[0]) );
if( zTemp==0 ){
sqlite3_free(zConverted);
return SQLITE_IOERR_NOMEM;
}
osGetFullPathNameW((LPCWSTR)zConverted, nByte, zTemp, 0);
sqlite3_free(zConverted);
zOut = unicodeToUtf8(zTemp);
sqlite3_free(zTemp);
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
** Since the ANSI version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
}else{
char *zTemp;
nByte = osGetFullPathNameA((char*)zConverted, 0, 0, 0) + 3;
zTemp = sqlite3_malloc( nByte*sizeof(zTemp[0]) );
if( zTemp==0 ){
sqlite3_free(zConverted);
return SQLITE_IOERR_NOMEM;
}
osGetFullPathNameA((char*)zConverted, nByte, zTemp, 0);
sqlite3_free(zConverted);
zOut = sqlite3_win32_mbcs_to_utf8(zTemp);
sqlite3_free(zTemp);
#endif
}
if( zOut ){
sqlite3_snprintf(pVfs->mxPathname, zFull, "%s", zOut);
sqlite3_free(zOut);
return SQLITE_OK;
}else{
return SQLITE_IOERR_NOMEM;
}
#endif
}
#ifndef SQLITE_OMIT_LOAD_EXTENSION
/*
** Interfaces for opening a shared library, finding entry points
** within the shared library, and closing the shared library.
*/
/*
** Interfaces for opening a shared library, finding entry points
** within the shared library, and closing the shared library.
*/
static void *winDlOpen(sqlite3_vfs *pVfs, const char *zFilename){
HANDLE h;
void *zConverted = convertUtf8Filename(zFilename);
UNUSED_PARAMETER(pVfs);
if( zConverted==0 ){
return 0;
}
if( isNT() ){
h = osLoadLibraryW((LPCWSTR)zConverted);
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
** Since the ANSI version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
}else{
h = osLoadLibraryA((char*)zConverted);
#endif
}
sqlite3_free(zConverted);
return (void*)h;
}
static void winDlError(sqlite3_vfs *pVfs, int nBuf, char *zBufOut){
UNUSED_PARAMETER(pVfs);
getLastErrorMsg(osGetLastError(), nBuf, zBufOut);
}
static void (*winDlSym(sqlite3_vfs *pVfs, void *pHandle, const char *zSymbol))(void){
UNUSED_PARAMETER(pVfs);
return (void(*)(void))osGetProcAddressA((HANDLE)pHandle, zSymbol);
}
static void winDlClose(sqlite3_vfs *pVfs, void *pHandle){
UNUSED_PARAMETER(pVfs);
osFreeLibrary((HANDLE)pHandle);
}
#else /* if SQLITE_OMIT_LOAD_EXTENSION is defined: */
#define winDlOpen 0
#define winDlError 0
#define winDlSym 0
#define winDlClose 0
#endif
/*
** Write up to nBuf bytes of randomness into zBuf.
*/
static int winRandomness(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
int n = 0;
UNUSED_PARAMETER(pVfs);
#if defined(SQLITE_TEST)
n = nBuf;
memset(zBuf, 0, nBuf);
#else
if( sizeof(SYSTEMTIME)<=nBuf-n ){
SYSTEMTIME x;
osGetSystemTime(&x);
memcpy(&zBuf[n], &x, sizeof(x));
n += sizeof(x);
}
if( sizeof(DWORD)<=nBuf-n ){
DWORD pid = osGetCurrentProcessId();
memcpy(&zBuf[n], &pid, sizeof(pid));
n += sizeof(pid);
}
if( sizeof(DWORD)<=nBuf-n ){
DWORD cnt = osGetTickCount();
memcpy(&zBuf[n], &cnt, sizeof(cnt));
n += sizeof(cnt);
}
if( sizeof(LARGE_INTEGER)<=nBuf-n ){
LARGE_INTEGER i;
osQueryPerformanceCounter(&i);
memcpy(&zBuf[n], &i, sizeof(i));
n += sizeof(i);
}
#endif
return n;
}
/*
** Sleep for a little while. Return the amount of time slept.
*/
static int winSleep(sqlite3_vfs *pVfs, int microsec){
osSleep((microsec+999)/1000);
UNUSED_PARAMETER(pVfs);
return ((microsec+999)/1000)*1000;
}
/*
** The following variable, if set to a non-zero value, is interpreted as
** the number of seconds since 1970 and is used to set the result of
** sqlite3OsCurrentTime() during testing.
*/
#ifdef SQLITE_TEST
int sqlite3_current_time = 0; /* Fake system time in seconds since 1970. */
#endif
/*
** Find the current time (in Universal Coordinated Time). Write into *piNow
** the current time and date as a Julian Day number times 86_400_000. In
** other words, write into *piNow the number of milliseconds since the Julian
** epoch of noon in Greenwich on November 24, 4714 B.C according to the
** proleptic Gregorian calendar.
**
** On success, return SQLITE_OK. Return SQLITE_ERROR if the time and date
** cannot be found.
*/
static int winCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *piNow){
/* FILETIME structure is a 64-bit value representing the number of
100-nanosecond intervals since January 1, 1601 (= JD 2305813.5).
*/
FILETIME ft;
static const sqlite3_int64 winFiletimeEpoch = 23058135*(sqlite3_int64)8640000;
#ifdef SQLITE_TEST
static const sqlite3_int64 unixEpoch = 24405875*(sqlite3_int64)8640000;
#endif
/* 2^32 - to avoid use of LL and warnings in gcc */
static const sqlite3_int64 max32BitValue =
(sqlite3_int64)2000000000 + (sqlite3_int64)2000000000 + (sqlite3_int64)294967296;
#if SQLITE_OS_WINCE
SYSTEMTIME time;
osGetSystemTime(&time);
/* if SystemTimeToFileTime() fails, it returns zero. */
if (!osSystemTimeToFileTime(&time,&ft)){
return SQLITE_ERROR;
}
#else
osGetSystemTimeAsFileTime( &ft );
#endif
*piNow = winFiletimeEpoch +
((((sqlite3_int64)ft.dwHighDateTime)*max32BitValue) +
(sqlite3_int64)ft.dwLowDateTime)/(sqlite3_int64)10000;
#ifdef SQLITE_TEST
if( sqlite3_current_time ){
*piNow = 1000*(sqlite3_int64)sqlite3_current_time + unixEpoch;
}
#endif
UNUSED_PARAMETER(pVfs);
return SQLITE_OK;
}
/*
** 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.
*/
static int winCurrentTime(sqlite3_vfs *pVfs, double *prNow){
int rc;
sqlite3_int64 i;
rc = winCurrentTimeInt64(pVfs, &i);
if( !rc ){
*prNow = i/86400000.0;
}
return rc;
}
/*
** The idea is that this function works like a combination of
** GetLastError() and FormatMessage() on Windows (or errno and
** strerror_r() on Unix). After an error is returned by an OS
** function, SQLite calls this function with zBuf pointing to
** a buffer of nBuf bytes. The OS layer should populate the
** buffer with a nul-terminated UTF-8 encoded error message
** describing the last IO error to have occurred within the calling
** thread.
**
** If the error message is too large for the supplied buffer,
** it should be truncated. The return value of xGetLastError
** is zero if the error message fits in the buffer, or non-zero
** otherwise (if the message was truncated). If non-zero is returned,
** then it is not necessary to include the nul-terminator character
** in the output buffer.
**
** Not supplying an error message will have no adverse effect
** on SQLite. It is fine to have an implementation that never
** returns an error message:
**
** int xGetLastError(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
** assert(zBuf[0]=='\0');
** return 0;
** }
**
** However if an error message is supplied, it will be incorporated
** by sqlite into the error message available to the user using
** sqlite3_errmsg(), possibly making IO errors easier to debug.
*/
static int winGetLastError(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
UNUSED_PARAMETER(pVfs);
return getLastErrorMsg(osGetLastError(), nBuf, zBuf);
}
/*
** Initialize and deinitialize the operating system interface.
*/
int sqlite3_os_init(void){
static sqlite3_vfs winVfs = {
3, /* iVersion */
sizeof(winFile), /* szOsFile */
MAX_PATH, /* mxPathname */
0, /* pNext */
"win32", /* zName */
0, /* pAppData */
winOpen, /* xOpen */
winDelete, /* xDelete */
winAccess, /* xAccess */
winFullPathname, /* xFullPathname */
winDlOpen, /* xDlOpen */
winDlError, /* xDlError */
winDlSym, /* xDlSym */
winDlClose, /* xDlClose */
winRandomness, /* xRandomness */
winSleep, /* xSleep */
winCurrentTime, /* xCurrentTime */
winGetLastError, /* xGetLastError */
winCurrentTimeInt64, /* xCurrentTimeInt64 */
winSetSystemCall, /* xSetSystemCall */
winGetSystemCall, /* xGetSystemCall */
winNextSystemCall, /* xNextSystemCall */
};
/* Double-check that the aSyscall[] array has been constructed
** correctly. See ticket [bb3a86e890c8e96ab] */
assert( ArraySize(aSyscall)==60 );
#ifndef SQLITE_OMIT_WAL
/* get memory map allocation granularity */
memset(&winSysInfo, 0, sizeof(SYSTEM_INFO));
osGetSystemInfo(&winSysInfo);
assert(winSysInfo.dwAllocationGranularity > 0);
#endif
sqlite3_vfs_register(&winVfs, 1);
return SQLITE_OK;
}
int sqlite3_os_end(void){
return SQLITE_OK;
}
#endif /* SQLITE_OS_WIN */