sqlcipher/src/test6.c at multi-lib · sqlcipher/sqlcipher · GitHub

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** 2004 May 22

** The author disclaims copyright to this source code. In place of

** a legal notice, here is a blessing:

** May you do good and not evil.

** May you find forgiveness for yourself and forgive others.

** May you share freely, never taking more than you give.

******************************************************************************

** This file contains code that modified the OS layer in order to simulate

** the effect on the database file of an OS crash or power failure. This

** is used to test the ability of SQLite to recover from those situations.

#if SQLITE_TEST /* This file is used for testing only */

#include "sqliteInt.h"

#include "tcl.h"

#ifndef SQLITE_OMIT_DISKIO /* This file is a no-op if disk I/O is disabled */

/* #define TRACE_CRASHTEST */

typedef struct CrashFile CrashFile;

typedef struct CrashGlobal CrashGlobal;

typedef struct WriteBuffer WriteBuffer;

** Method:

** This layer is implemented as a wrapper around the "real"

** sqlite3_file object for the host system. Each time data is

** written to the file object, instead of being written to the

** underlying file, the write operation is stored in an in-memory

** structure (type WriteBuffer). This structure is placed at the

** end of a global ordered list (the write-list).

** When data is read from a file object, the requested region is

** first retrieved from the real file. The write-list is then

** traversed and data copied from any overlapping WriteBuffer

** structures to the output buffer. i.e. a read() operation following

** one or more write() operations works as expected, even if no

** data has actually been written out to the real file.

** When a fsync() operation is performed, an operating system crash

** may be simulated, in which case exit(-1) is called (the call to

** xSync() never returns). Whether or not a crash is simulated,

** the data associated with a subset of the WriteBuffer structures

** stored in the write-list is written to the real underlying files

** and the entries removed from the write-list. If a crash is simulated,

** a subset of the buffers may be corrupted before the data is written.

** The exact subset of the write-list written and/or corrupted is

** determined by the simulated device characteristics and sector-size.

** "Normal" mode:

** Normal mode is used when the simulated device has none of the

** SQLITE_IOCAP_XXX flags set.

** In normal mode, if the fsync() is not a simulated crash, the

** write-list is traversed from beginning to end. Each WriteBuffer

** structure associated with the file handle used to call xSync()

** is written to the real file and removed from the write-list.

** If a crash is simulated, one of the following takes place for

** each WriteBuffer in the write-list, regardless of which

** file-handle it is associated with:

** 1. The buffer is correctly written to the file, just as if

** a crash were not being simulated.

** 2. Nothing is done.

** 3. Garbage data is written to all sectors of the file that

** overlap the region specified by the WriteBuffer. Or garbage

** data is written to some contiguous section within the

** overlapped sectors.

** Device Characteristic flag handling:

** If the IOCAP_ATOMIC flag is set, then option (3) above is

** never selected.

** If the IOCAP_ATOMIC512 flag is set, and the WriteBuffer represents

** an aligned write() of an integer number of 512 byte regions, then

** option (3) above is never selected. Instead, each 512 byte region

** is either correctly written or left completely untouched. Similar

** logic governs the behavior if any of the other ATOMICXXX flags

** is set.

** If either the IOCAP_SAFEAPPEND or IOCAP_SEQUENTIAL flags are set

** and a crash is being simulated, then an entry of the write-list is

** selected at random. Everything in the list after the selected entry

** is discarded before processing begins.

** If IOCAP_SEQUENTIAL is set and a crash is being simulated, option

** (1) is selected for all write-list entries except the last. If a

** crash is not being simulated, then all entries in the write-list

** that occur before at least one write() on the file-handle specified

** as part of the xSync() are written to their associated real files.

** If IOCAP_SAFEAPPEND is set and the first byte written by the write()

** operation is one byte past the current end of the file, then option

** (1) is always selected.

** Each write operation in the write-list is represented by an instance

** of the following structure.

** If zBuf is 0, then this structure represents a call to xTruncate(),

** not xWrite(). In that case, iOffset is the size that the file is

** truncated to.

struct WriteBuffer {

i64 iOffset; /* Byte offset of the start of this write() */

int nBuf; /* Number of bytes written */

u8 *zBuf; /* Pointer to copy of written data */

CrashFile *pFile; /* File this write() applies to */

WriteBuffer *pNext; /* Next in CrashGlobal.pWriteList */

};

struct CrashFile {

const sqlite3_io_methods *pMethod; /* Must be first */

sqlite3_file *pRealFile; /* Underlying "real" file handle */

char *zName;

int flags; /* Flags the file was opened with */

/* Cache of the entire file. This is used to speed up OsRead() and

** OsFileSize() calls. Although both could be done by traversing the

** write-list, in practice this is impractically slow.

int iSize; /* Size of file in bytes */

int nData; /* Size of buffer allocated at zData */

u8 *zData; /* Buffer containing file contents */

};

struct CrashGlobal {

WriteBuffer *pWriteList; /* Head of write-list */

WriteBuffer *pWriteListEnd; /* End of write-list */

int iSectorSize; /* Value of simulated sector size */

int iDeviceCharacteristics; /* Value of simulated device characteristics */

int iCrash; /* Crash on the iCrash'th call to xSync() */

char zCrashFile[500]; /* Crash during an xSync() on this file */

};

static CrashGlobal g = {0, 0, SQLITE_DEFAULT_SECTOR_SIZE, 0, 0};

** Set this global variable to 1 to enable crash testing.

static int sqlite3CrashTestEnable = 0;

static void *crash_malloc(int nByte){

return (void *)Tcl_Alloc((size_t)nByte);

}

static void crash_free(void *p){

Tcl_Free(p);

}

static void *crash_realloc(void *p, int n){

return (void *)Tcl_Realloc(p, (size_t)n);

}

** Wrapper around the sqlite3OsWrite() function that avoids writing to the

** 512 byte block begining at offset PENDING_BYTE.

static int writeDbFile(CrashFile *p, u8 *z, i64 iAmt, i64 iOff){

int rc = SQLITE_OK;

int iSkip = 0;

if( iOff==PENDING_BYTE && (p->flags&SQLITE_OPEN_MAIN_DB) ){

iSkip = 512;

}

if( (iAmt-iSkip)>0 ){

rc = sqlite3OsWrite(p->pRealFile, &z[iSkip], (int)(iAmt-iSkip), iOff+iSkip);

}

return rc;

}

** Flush the write-list as if xSync() had been called on file handle

** pFile. If isCrash is true, simulate a crash.

static int writeListSync(CrashFile *pFile, int isCrash){

int rc = SQLITE_OK;

int iDc = g.iDeviceCharacteristics;

WriteBuffer *pWrite;

WriteBuffer **ppPtr;

/* If this is not a crash simulation, set pFinal to point to the

** last element of the write-list that is associated with file handle

** pFile.

** If this is a crash simulation, set pFinal to an arbitrarily selected

** element of the write-list.

WriteBuffer *pFinal = 0;

if( !isCrash ){

for(pWrite=g.pWriteList; pWrite; pWrite=pWrite->pNext){

if( pWrite->pFile==pFile ){

pFinal = pWrite;

}

}else if( iDc&(SQLITE_IOCAP_SEQUENTIAL|SQLITE_IOCAP_SAFE_APPEND) ){

int nWrite = 0;

int iFinal;

for(pWrite=g.pWriteList; pWrite; pWrite=pWrite->pNext) nWrite++;

sqlite3_randomness(sizeof(int), &iFinal);

iFinal = ((iFinal<0)?-1*iFinal:iFinal)%nWrite;

for(pWrite=g.pWriteList; iFinal>0; pWrite=pWrite->pNext) iFinal--;

pFinal = pWrite;

}

#ifdef TRACE_CRASHTEST

printf("Sync %s (is %s crash)\n", pFile->zName, (isCrash?"a":"not a"));

#endif

ppPtr = &g.pWriteList;

for(pWrite=*ppPtr; rc==SQLITE_OK && pWrite; pWrite=*ppPtr){

sqlite3_file *pRealFile = pWrite->pFile->pRealFile;

/* (eAction==1) -> write block out normally,

** (eAction==2) -> do nothing,

** (eAction==3) -> trash sectors.

int eAction = 0;

if( !isCrash ){

eAction = 2;

if( (pWrite->pFile==pFile || iDc&SQLITE_IOCAP_SEQUENTIAL) ){

eAction = 1;

}

}else{

char random;

sqlite3_randomness(1, &random);

/* Do not select option 3 (sector trashing) if the IOCAP_ATOMIC flag

** is set or this is an OsTruncate(), not an Oswrite().

if( (iDc&SQLITE_IOCAP_ATOMIC) || (pWrite->zBuf==0) ){

random &= 0x01;

}

/* If IOCAP_SEQUENTIAL is set and this is not the final entry

** in the truncated write-list, always select option 1 (write

** out correctly).

if( (iDc&SQLITE_IOCAP_SEQUENTIAL && pWrite!=pFinal) ){

random = 0;

}

/* If IOCAP_SAFE_APPEND is set and this OsWrite() operation is

** an append (first byte of the written region is 1 byte past the

** current EOF), always select option 1 (write out correctly).

if( iDc&SQLITE_IOCAP_SAFE_APPEND && pWrite->zBuf ){

i64 iSize;

sqlite3OsFileSize(pRealFile, &iSize);

if( iSize==pWrite->iOffset ){

random = 0;

}

if( (random&0x06)==0x06 ){

eAction = 3;

}else{

eAction = ((random&0x01)?2:1);

}

switch( eAction ){

case 1: { /* Write out correctly */

if( pWrite->zBuf ){

rc = writeDbFile(

pWrite->pFile, pWrite->zBuf, pWrite->nBuf, pWrite->iOffset

);

}else{

rc = sqlite3OsTruncate(pRealFile, pWrite->iOffset);

}

*ppPtr = pWrite->pNext;

#ifdef TRACE_CRASHTEST

if( isCrash ){

printf("Writing %d bytes @ %d (%s)\n",

pWrite->nBuf, (int)pWrite->iOffset, pWrite->pFile->zName

);

}

#endif

crash_free(pWrite);

break;

}

case 2: { /* Do nothing */

ppPtr = &pWrite->pNext;

#ifdef TRACE_CRASHTEST

if( isCrash ){

printf("Omiting %d bytes @ %d (%s)\n",

pWrite->nBuf, (int)pWrite->iOffset, pWrite->pFile->zName

);

}

#endif

break;

}

case 3: { /* Trash sectors */

u8 *zGarbage;

int iFirst = (int)(pWrite->iOffset/g.iSectorSize);

int iLast = (int)((pWrite->iOffset+pWrite->nBuf-1)/g.iSectorSize);

assert(pWrite->zBuf);

#ifdef TRACE_CRASHTEST

printf("Trashing %d sectors @ %lld (sector %d) (%s)\n",

1+iLast-iFirst, pWrite->iOffset, iFirst, pWrite->pFile->zName

);

#endif

zGarbage = crash_malloc(g.iSectorSize);

if( zGarbage ){

sqlite3_int64 i;

for(i=iFirst; rc==SQLITE_OK && i<=iLast; i++){

sqlite3_randomness(g.iSectorSize, zGarbage);

rc = writeDbFile(

pWrite->pFile, zGarbage, g.iSectorSize, i*g.iSectorSize

);

}

crash_free(zGarbage);

}else{

rc = SQLITE_NOMEM;

}

ppPtr = &pWrite->pNext;

break;

}

default:

assert(!"Cannot happen");

}

if( pWrite==pFinal ) break;

}

if( rc==SQLITE_OK && isCrash ){

exit(-1);

}

for(pWrite=g.pWriteList; pWrite && pWrite->pNext; pWrite=pWrite->pNext);

g.pWriteListEnd = pWrite;

return rc;

}

** Add an entry to the end of the write-list.

static int writeListAppend(

sqlite3_file *pFile,

sqlite3_int64 iOffset,

const u8 *zBuf,

int nBuf

){

WriteBuffer *pNew;

assert((zBuf && nBuf) || (!nBuf && !zBuf));

pNew = (WriteBuffer *)crash_malloc(sizeof(WriteBuffer) + nBuf);

if( pNew==0 ){

fprintf(stderr, "out of memory in the crash simulator\n");

}

memset(pNew, 0, sizeof(WriteBuffer)+nBuf);

pNew->iOffset = iOffset;

pNew->nBuf = nBuf;

pNew->pFile = (CrashFile *)pFile;

if( zBuf ){

pNew->zBuf = (u8 *)&pNew[1];

memcpy(pNew->zBuf, zBuf, nBuf);

}

if( g.pWriteList ){

assert(g.pWriteListEnd);

g.pWriteListEnd->pNext = pNew;

}else{

g.pWriteList = pNew;

}

g.pWriteListEnd = pNew;

return SQLITE_OK;

}

** Close a crash-file.

static int cfClose(sqlite3_file *pFile){

CrashFile *pCrash = (CrashFile *)pFile;

writeListSync(pCrash, 0);

sqlite3OsClose(pCrash->pRealFile);

return SQLITE_OK;

}

** Read data from a crash-file.

static int cfRead(

sqlite3_file *pFile,

void *zBuf,

int iAmt,

sqlite_int64 iOfst

){

CrashFile *pCrash = (CrashFile *)pFile;

/* Check the file-size to see if this is a short-read */

if( pCrash->iSize<(iOfst+iAmt) ){

return SQLITE_IOERR_SHORT_READ;

}

memcpy(zBuf, &pCrash->zData[iOfst], iAmt);

return SQLITE_OK;

}

** Write data to a crash-file.

static int cfWrite(

sqlite3_file *pFile,

const void *zBuf,

int iAmt,

sqlite_int64 iOfst

){

CrashFile *pCrash = (CrashFile *)pFile;

if( iAmt+iOfst>pCrash->iSize ){

pCrash->iSize = (int)(iAmt+iOfst);

}

while( pCrash->iSize>pCrash->nData ){

u8 *zNew;

int nNew = (pCrash->nData*2) + 4096;

zNew = crash_realloc(pCrash->zData, nNew);

if( !zNew ){

return SQLITE_NOMEM;

}

memset(&zNew[pCrash->nData], 0, nNew-pCrash->nData);

pCrash->nData = nNew;

pCrash->zData = zNew;

}

memcpy(&pCrash->zData[iOfst], zBuf, iAmt);

return writeListAppend(pFile, iOfst, zBuf, iAmt);

}

** Truncate a crash-file.

static int cfTruncate(sqlite3_file *pFile, sqlite_int64 size){

CrashFile *pCrash = (CrashFile *)pFile;

assert(size>=0);

if( pCrash->iSize>size ){

pCrash->iSize = (int)size;

}

return writeListAppend(pFile, size, 0, 0);

}

** Sync a crash-file.

static int cfSync(sqlite3_file *pFile, int flags){

CrashFile *pCrash = (CrashFile *)pFile;

int isCrash = 0;

const char *zName = pCrash->zName;

const char *zCrashFile = g.zCrashFile;

int nName = (int)strlen(zName);

int nCrashFile = (int)strlen(zCrashFile);

if( nCrashFile>0 && zCrashFile[nCrashFile-1]=='*' ){

nCrashFile--;

if( nName>nCrashFile ) nName = nCrashFile;

}

#ifdef TRACE_CRASHTEST

printf("cfSync(): nName = %d, nCrashFile = %d, zName = %s, zCrashFile = %s\n",

nName, nCrashFile, zName, zCrashFile);

#endif

if( nName==nCrashFile && 0==memcmp(zName, zCrashFile, nName) ){

#ifdef TRACE_CRASHTEST

printf("cfSync(): name matched, g.iCrash = %d\n", g.iCrash);

#endif

if( (--g.iCrash)==0 ) isCrash = 1;

}

return writeListSync(pCrash, isCrash);

}

** Return the current file-size of the crash-file.

static int cfFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){

CrashFile *pCrash = (CrashFile *)pFile;

*pSize = (i64)pCrash->iSize;

return SQLITE_OK;

}

** Calls related to file-locks are passed on to the real file handle.

static int cfLock(sqlite3_file *pFile, int eLock){

return sqlite3OsLock(((CrashFile *)pFile)->pRealFile, eLock);

}

static int cfUnlock(sqlite3_file *pFile, int eLock){

return sqlite3OsUnlock(((CrashFile *)pFile)->pRealFile, eLock);

}

static int cfCheckReservedLock(sqlite3_file *pFile, int *pResOut){

return sqlite3OsCheckReservedLock(((CrashFile *)pFile)->pRealFile, pResOut);

}

static int cfFileControl(sqlite3_file *pFile, int op, void *pArg){

if( op==SQLITE_FCNTL_SIZE_HINT ){

CrashFile *pCrash = (CrashFile *)pFile;

i64 nByte = *(i64 *)pArg;

if( nByte>pCrash->iSize ){

if( SQLITE_OK==writeListAppend(pFile, nByte, 0, 0) ){

pCrash->iSize = (int)nByte;

}

return SQLITE_OK;

}

return sqlite3OsFileControl(((CrashFile *)pFile)->pRealFile, op, pArg);

}

** The xSectorSize() and xDeviceCharacteristics() functions return

** the global values configured by the [sqlite_crashparams] tcl

* interface.

static int cfSectorSize(sqlite3_file *pFile){

return g.iSectorSize;

}

static int cfDeviceCharacteristics(sqlite3_file *pFile){

return g.iDeviceCharacteristics;

}

** Pass-throughs for WAL support.

static int cfShmLock(sqlite3_file *pFile, int ofst, int n, int flags){

return sqlite3OsShmLock(((CrashFile*)pFile)->pRealFile, ofst, n, flags);

}

static void cfShmBarrier(sqlite3_file *pFile){

sqlite3OsShmBarrier(((CrashFile*)pFile)->pRealFile);

}

static int cfShmUnmap(sqlite3_file *pFile, int delFlag){

return sqlite3OsShmUnmap(((CrashFile*)pFile)->pRealFile, delFlag);

}

static int cfShmMap(

sqlite3_file *pFile, /* Handle open on database file */

int iRegion, /* Region to retrieve */

int sz, /* Size of regions */

int w, /* True to extend file if necessary */

void volatile **pp /* OUT: Mapped memory */

){

return sqlite3OsShmMap(((CrashFile*)pFile)->pRealFile, iRegion, sz, w, pp);

}

static const sqlite3_io_methods CrashFileVtab = {

2, /* iVersion */

cfClose, /* xClose */

cfRead, /* xRead */

cfWrite, /* xWrite */

cfTruncate, /* xTruncate */

cfSync, /* xSync */

cfFileSize, /* xFileSize */

cfLock, /* xLock */

cfUnlock, /* xUnlock */

cfCheckReservedLock, /* xCheckReservedLock */

cfFileControl, /* xFileControl */

cfSectorSize, /* xSectorSize */

cfDeviceCharacteristics, /* xDeviceCharacteristics */

cfShmMap, /* xShmMap */

cfShmLock, /* xShmLock */

cfShmBarrier, /* xShmBarrier */

cfShmUnmap /* xShmUnmap */

};

** Application data for the crash VFS

struct crashAppData {

sqlite3_vfs *pOrig; /* Wrapped vfs structure */

};

** Open a crash-file file handle.

** The caller will have allocated pVfs->szOsFile bytes of space

** at pFile. This file uses this space for the CrashFile structure

** and allocates space for the "real" file structure using

** sqlite3_malloc(). The assumption here is (pVfs->szOsFile) is

** equal or greater than sizeof(CrashFile).

static int cfOpen(

sqlite3_vfs *pCfVfs,

const char *zName,

sqlite3_file *pFile,

int flags,

int *pOutFlags

){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

int rc;

CrashFile *pWrapper = (CrashFile *)pFile;

sqlite3_file *pReal = (sqlite3_file*)&pWrapper[1];

memset(pWrapper, 0, sizeof(CrashFile));

rc = sqlite3OsOpen(pVfs, zName, pReal, flags, pOutFlags);

if( rc==SQLITE_OK ){

i64 iSize;

pWrapper->pMethod = &CrashFileVtab;

pWrapper->zName = (char *)zName;

pWrapper->pRealFile = pReal;

rc = sqlite3OsFileSize(pReal, &iSize);

pWrapper->iSize = (int)iSize;

pWrapper->flags = flags;

}

if( rc==SQLITE_OK ){

pWrapper->nData = (4096 + pWrapper->iSize);

pWrapper->zData = crash_malloc(pWrapper->nData);

if( pWrapper->zData ){

/* os_unix.c contains an assert() that fails if the caller attempts

** to read data from the 512-byte locking region of a file opened

** with the SQLITE_OPEN_MAIN_DB flag. This region of a database file

** never contains valid data anyhow. So avoid doing such a read here.

** UPDATE: It also contains an assert() verifying that each call

** to the xRead() method reads less than 128KB of data.

const int isDb = (flags&SQLITE_OPEN_MAIN_DB);

i64 iOff;

memset(pWrapper->zData, 0, pWrapper->nData);

for(iOff=0; iOff<pWrapper->iSize; iOff += 512){

int nRead = pWrapper->iSize - (int)iOff;

if( nRead>512 ) nRead = 512;

if( isDb && iOff==PENDING_BYTE ) continue;

rc = sqlite3OsRead(pReal, &pWrapper->zData[iOff], nRead, iOff);

}

}else{

rc = SQLITE_NOMEM;

}

if( rc!=SQLITE_OK && pWrapper->pMethod ){

sqlite3OsClose(pFile);

}

return rc;

}

static int cfDelete(sqlite3_vfs *pCfVfs, const char *zPath, int dirSync){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

return pVfs->xDelete(pVfs, zPath, dirSync);

}

static int cfAccess(

sqlite3_vfs *pCfVfs,

const char *zPath,

int flags,

int *pResOut

){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

return pVfs->xAccess(pVfs, zPath, flags, pResOut);

}

static int cfFullPathname(

sqlite3_vfs *pCfVfs,

const char *zPath,

int nPathOut,

char *zPathOut

){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

return pVfs->xFullPathname(pVfs, zPath, nPathOut, zPathOut);

}

static void *cfDlOpen(sqlite3_vfs *pCfVfs, const char *zPath){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

return pVfs->xDlOpen(pVfs, zPath);

}

static void cfDlError(sqlite3_vfs *pCfVfs, int nByte, char *zErrMsg){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

pVfs->xDlError(pVfs, nByte, zErrMsg);

}

static void (*cfDlSym(sqlite3_vfs *pCfVfs, void *pH, const char *zSym))(void){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

return pVfs->xDlSym(pVfs, pH, zSym);

}

static void cfDlClose(sqlite3_vfs *pCfVfs, void *pHandle){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

pVfs->xDlClose(pVfs, pHandle);

}

static int cfRandomness(sqlite3_vfs *pCfVfs, int nByte, char *zBufOut){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

return pVfs->xRandomness(pVfs, nByte, zBufOut);

}

static int cfSleep(sqlite3_vfs *pCfVfs, int nMicro){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

return pVfs->xSleep(pVfs, nMicro);

}

static int cfCurrentTime(sqlite3_vfs *pCfVfs, double *pTimeOut){

sqlite3_vfs *pVfs = (sqlite3_vfs *)pCfVfs->pAppData;

return pVfs->xCurrentTime(pVfs, pTimeOut);

}

static int processDevSymArgs(

Tcl_Interp *interp,

int objc,

Tcl_Obj *CONST objv[],

int *piDeviceChar,

int *piSectorSize

){

struct DeviceFlag {

char *zName;

int iValue;

} aFlag[] = {

{ "atomic", SQLITE_IOCAP_ATOMIC },

{ "atomic512", SQLITE_IOCAP_ATOMIC512 },

{ "atomic1k", SQLITE_IOCAP_ATOMIC1K },

{ "atomic2k", SQLITE_IOCAP_ATOMIC2K },

{ "atomic4k", SQLITE_IOCAP_ATOMIC4K },

{ "atomic8k", SQLITE_IOCAP_ATOMIC8K },

{ "atomic16k", SQLITE_IOCAP_ATOMIC16K },

{ "atomic32k", SQLITE_IOCAP_ATOMIC32K },

{ "atomic64k", SQLITE_IOCAP_ATOMIC64K },

{ "sequential", SQLITE_IOCAP_SEQUENTIAL },

{ "safe_append", SQLITE_IOCAP_SAFE_APPEND },

{ "powersafe_overwrite", SQLITE_IOCAP_POWERSAFE_OVERWRITE },

{ 0, 0 }

};

int i;

int iDc = 0;

int iSectorSize = 0;

int setSectorsize = 0;

int setDeviceChar = 0;

for(i=0; i<objc; i+=2){

int nOpt;

char *zOpt = Tcl_GetStringFromObj(objv[i], &nOpt);

if( (nOpt>11 || nOpt<2 || strncmp("-sectorsize", zOpt, nOpt))

&& (nOpt>16 || nOpt<2 || strncmp("-characteristics", zOpt, nOpt))

){

Tcl_AppendResult(interp,

"Bad option: \"", zOpt,

"\" - must be \"-characteristics\" or \"-sectorsize\"", 0

);

return TCL_ERROR;

}

if( i==objc-1 ){

Tcl_AppendResult(interp, "Option requires an argument: \"", zOpt, "\"",0);

return TCL_ERROR;

}

if( zOpt[1]=='s' ){

if( Tcl_GetIntFromObj(interp, objv[i+1], &iSectorSize) ){

return TCL_ERROR;

}

setSectorsize = 1;

}else{

int j;

Tcl_Obj **apObj;

int nObj;

if( Tcl_ListObjGetElements(interp, objv[i+1], &nObj, &apObj) ){

return TCL_ERROR;

}

for(j=0; j<nObj; j++){

int rc;

int iChoice;

Tcl_Obj *pFlag = Tcl_DuplicateObj(apObj[j]);

Tcl_IncrRefCount(pFlag);

Tcl_UtfToLower(Tcl_GetString(pFlag));

rc = Tcl_GetIndexFromObjStruct(

interp, pFlag, aFlag, sizeof(aFlag[0]), "no such flag", 0, &iChoice

);

Tcl_DecrRefCount(pFlag);

if( rc ){

return TCL_ERROR;

}

iDc |= aFlag[iChoice].iValue;

}

setDeviceChar = 1;

}

if( setDeviceChar ){

*piDeviceChar = iDc;

}

if( setSectorsize ){

*piSectorSize = iSectorSize;

}

return TCL_OK;

}

** tclcmd: sqlite_crash_enable ENABLE

** Parameter ENABLE must be a boolean value. If true, then the "crash"

** vfs is added to the system. If false, it is removed.

static int crashEnableCmd(

void * clientData,

Tcl_Interp *interp,

int objc,

Tcl_Obj *CONST objv[]

){

int isEnable;

static sqlite3_vfs crashVfs = {

2, /* iVersion */

0, /* szOsFile */

0, /* mxPathname */

0, /* pNext */

"crash", /* zName */

0, /* pAppData */

cfOpen, /* xOpen */

cfDelete, /* xDelete */

cfAccess, /* xAccess */

cfFullPathname, /* xFullPathname */

cfDlOpen, /* xDlOpen */

cfDlError, /* xDlError */

cfDlSym, /* xDlSym */

cfDlClose, /* xDlClose */

cfRandomness, /* xRandomness */

cfSleep, /* xSleep */

cfCurrentTime, /* xCurrentTime */

0, /* xGetlastError */

0, /* xCurrentTimeInt64 */

};

if( objc!=2 ){

Tcl_WrongNumArgs(interp, 1, objv, "ENABLE");

return TCL_ERROR;

}

if( Tcl_GetBooleanFromObj(interp, objv[1], &isEnable) ){

return TCL_ERROR;

}

if( (isEnable && crashVfs.pAppData) || (!isEnable && !crashVfs.pAppData) ){

return TCL_OK;

}

if( crashVfs.pAppData==0 ){

sqlite3_vfs *pOriginalVfs = sqlite3_vfs_find(0);

crashVfs.mxPathname = pOriginalVfs->mxPathname;

crashVfs.pAppData = (void *)pOriginalVfs;

crashVfs.szOsFile = sizeof(CrashFile) + pOriginalVfs->szOsFile;

sqlite3_vfs_register(&crashVfs, 0);

}else{

crashVfs.pAppData = 0;

sqlite3_vfs_unregister(&crashVfs);

}

return TCL_OK;

}

** tclcmd: sqlite_crashparams ?OPTIONS? DELAY CRASHFILE

** This procedure implements a TCL command that enables crash testing

** in testfixture. Once enabled, crash testing cannot be disabled.

** Available options are "-characteristics" and "-sectorsize". Both require

** an argument. For -sectorsize, this is the simulated sector size in

** bytes. For -characteristics, the argument must be a list of io-capability

** flags to simulate. Valid flags are "atomic", "atomic512", "atomic1K",

** "atomic2K", "atomic4K", "atomic8K", "atomic16K", "atomic32K",

** "atomic64K", "sequential" and "safe_append".

** Example:

** sqlite_crashparams -sect 1024 -char {atomic sequential} ./test.db 1

static int crashParamsObjCmd(

void * clientData,

Tcl_Interp *interp,

int objc,

Tcl_Obj *CONST objv[]

){

int iDelay;

const char *zCrashFile;

int nCrashFile, iDc, iSectorSize;

iDc = -1;

iSectorSize = -1;

if( objc<3 ){

Tcl_WrongNumArgs(interp, 1, objv, "?OPTIONS? DELAY CRASHFILE");

goto error;

}

zCrashFile = Tcl_GetStringFromObj(objv[objc-1], &nCrashFile);

if( nCrashFile>=sizeof(g.zCrashFile) ){

Tcl_AppendResult(interp, "Filename is too long: \"", zCrashFile, "\"", 0);

goto error;

}

if( Tcl_GetIntFromObj(interp, objv[objc-2], &iDelay) ){

goto error;

}

if( processDevSymArgs(interp, objc-3, &objv[1], &iDc, &iSectorSize) ){

return TCL_ERROR;

}

if( iDc>=0 ){

g.iDeviceCharacteristics = iDc;

}

if( iSectorSize>=0 ){

g.iSectorSize = iSectorSize;

}

g.iCrash = iDelay;

memcpy(g.zCrashFile, zCrashFile, nCrashFile+1);

sqlite3CrashTestEnable = 1;

return TCL_OK;

error:

return TCL_ERROR;

}

static int devSymObjCmd(

void * clientData,

Tcl_Interp *interp,

int objc,

Tcl_Obj *CONST objv[]

){

void devsym_register(int iDeviceChar, int iSectorSize);

int iDc = -1;

int iSectorSize = -1;

if( processDevSymArgs(interp, objc-1, &objv[1], &iDc, &iSectorSize) ){

return TCL_ERROR;

}

devsym_register(iDc, iSectorSize);

return TCL_OK;

}

** tclcmd: register_jt_vfs ?-default? PARENT-VFS

static int jtObjCmd(

void * clientData,

Tcl_Interp *interp,

int objc,

Tcl_Obj *CONST objv[]

){

int jt_register(char *, int);

char *zParent = 0;

if( objc!=2 && objc!=3 ){

Tcl_WrongNumArgs(interp, 1, objv, "?-default? PARENT-VFS");

return TCL_ERROR;

}

zParent = Tcl_GetString(objv[1]);

if( objc==3 ){

if( strcmp(zParent, "-default") ){

Tcl_AppendResult(interp,

"bad option \"", zParent, "\": must be -default", 0

);

return TCL_ERROR;

}

zParent = Tcl_GetString(objv[2]);

}

if( !(*zParent) ){

zParent = 0;

}

if( jt_register(zParent, objc==3) ){

Tcl_AppendResult(interp, "Error in jt_register", 0);

return TCL_ERROR;

}

return TCL_OK;

}

** tclcmd: unregister_jt_vfs

static int jtUnregisterObjCmd(

void * clientData,

Tcl_Interp *interp,

int objc,

Tcl_Obj *CONST objv[]

){

void jt_unregister(void);

if( objc!=1 ){

Tcl_WrongNumArgs(interp, 1, objv, "");

return TCL_ERROR;

}

jt_unregister();

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sqlcipher/src/test6.c at multi-lib · sqlcipher/sqlcipher · GitHub

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