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sqlcipher/src/test_vfs.c

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/*
** 2010 May 05
**
** 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 the implementation of the Tcl [testvfs] command,
** used to create SQLite VFS implementations with various properties and
** instrumentation to support testing SQLite.
**
** testvfs VFSNAME ?OPTIONS?
**
** Available options are:
**
** -noshm BOOLEAN (True to omit shm methods. Default false)
** -default BOOLEAN (True to make the vfs default. Default false)
** -szosfile INTEGER (Value for sqlite3_vfs.szOsFile)
** -mxpathname INTEGER (Value for sqlite3_vfs.mxPathname)
** -iversion INTEGER (Value for sqlite3_vfs.iVersion)
*/
#if SQLITE_TEST /* This file is used for testing only */
#include "sqlite3.h"
#include "sqliteInt.h"
#include <tcl.h>
typedef struct Testvfs Testvfs;
typedef struct TestvfsShm TestvfsShm;
typedef struct TestvfsBuffer TestvfsBuffer;
typedef struct TestvfsFile TestvfsFile;
typedef struct TestvfsFd TestvfsFd;
/*
** An open file handle.
*/
struct TestvfsFile {
sqlite3_file base; /* Base class. Must be first */
TestvfsFd *pFd; /* File data */
};
#define tvfsGetFd(pFile) (((TestvfsFile *)pFile)->pFd)
struct TestvfsFd {
sqlite3_vfs *pVfs; /* The VFS */
const char *zFilename; /* Filename as passed to xOpen() */
sqlite3_file *pReal; /* The real, underlying file descriptor */
Tcl_Obj *pShmId; /* Shared memory id for Tcl callbacks */
TestvfsBuffer *pShm; /* Shared memory buffer */
u32 excllock; /* Mask of exclusive locks */
u32 sharedlock; /* Mask of shared locks */
TestvfsFd *pNext; /* Next handle opened on the same file */
};
#define FAULT_INJECT_NONE 0
#define FAULT_INJECT_TRANSIENT 1
#define FAULT_INJECT_PERSISTENT 2
typedef struct TestFaultInject TestFaultInject;
struct TestFaultInject {
int iCnt; /* Remaining calls before fault injection */
int eFault; /* A FAULT_INJECT_* value */
int nFail; /* Number of faults injected */
};
/*
** An instance of this structure is allocated for each VFS created. The
** sqlite3_vfs.pAppData field of the VFS structure registered with SQLite
** is set to point to it.
*/
struct Testvfs {
char *zName; /* Name of this VFS */
sqlite3_vfs *pParent; /* The VFS to use for file IO */
sqlite3_vfs *pVfs; /* The testvfs registered with SQLite */
Tcl_Interp *interp; /* Interpreter to run script in */
Tcl_Obj *pScript; /* Script to execute */
TestvfsBuffer *pBuffer; /* List of shared buffers */
int isNoshm;
int isFullshm;
int mask; /* Mask controlling [script] and [ioerr] */
TestFaultInject ioerr_err;
TestFaultInject full_err;
TestFaultInject cantopen_err;
#if 0
int iIoerrCnt;
int ioerr;
int nIoerrFail;
int iFullCnt;
int fullerr;
int nFullFail;
#endif
int iDevchar;
int iSectorsize;
};
/*
** The Testvfs.mask variable is set to a combination of the following.
** If a bit is clear in Testvfs.mask, then calls made by SQLite to the
** corresponding VFS method is ignored for purposes of:
**
** + Simulating IO errors, and
** + Invoking the Tcl callback script.
*/
#define TESTVFS_SHMOPEN_MASK 0x00000001
#define TESTVFS_SHMLOCK_MASK 0x00000010
#define TESTVFS_SHMMAP_MASK 0x00000020
#define TESTVFS_SHMBARRIER_MASK 0x00000040
#define TESTVFS_SHMCLOSE_MASK 0x00000080
#define TESTVFS_OPEN_MASK 0x00000100
#define TESTVFS_SYNC_MASK 0x00000200
#define TESTVFS_DELETE_MASK 0x00000400
#define TESTVFS_CLOSE_MASK 0x00000800
#define TESTVFS_WRITE_MASK 0x00001000
#define TESTVFS_TRUNCATE_MASK 0x00002000
#define TESTVFS_ACCESS_MASK 0x00004000
#define TESTVFS_FULLPATHNAME_MASK 0x00008000
#define TESTVFS_READ_MASK 0x00010000
#define TESTVFS_UNLOCK_MASK 0x00020000
#define TESTVFS_LOCK_MASK 0x00040000
#define TESTVFS_CKLOCK_MASK 0x00080000
#define TESTVFS_ALL_MASK 0x000FFFFF
#define TESTVFS_MAX_PAGES 1024
/*
** A shared-memory buffer. There is one of these objects for each shared
** memory region opened by clients. If two clients open the same file,
** there are two TestvfsFile structures but only one TestvfsBuffer structure.
*/
struct TestvfsBuffer {
char *zFile; /* Associated file name */
int pgsz; /* Page size */
u8 *aPage[TESTVFS_MAX_PAGES]; /* Array of ckalloc'd pages */
TestvfsFd *pFile; /* List of open handles */
TestvfsBuffer *pNext; /* Next in linked list of all buffers */
};
#define PARENTVFS(x) (((Testvfs *)((x)->pAppData))->pParent)
#define TESTVFS_MAX_ARGS 12
/*
** Method declarations for TestvfsFile.
*/
static int tvfsClose(sqlite3_file*);
static int tvfsRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
static int tvfsWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst);
static int tvfsTruncate(sqlite3_file*, sqlite3_int64 size);
static int tvfsSync(sqlite3_file*, int flags);
static int tvfsFileSize(sqlite3_file*, sqlite3_int64 *pSize);
static int tvfsLock(sqlite3_file*, int);
static int tvfsUnlock(sqlite3_file*, int);
static int tvfsCheckReservedLock(sqlite3_file*, int *);
static int tvfsFileControl(sqlite3_file*, int op, void *pArg);
static int tvfsSectorSize(sqlite3_file*);
static int tvfsDeviceCharacteristics(sqlite3_file*);
/*
** Method declarations for tvfs_vfs.
*/
static int tvfsOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *);
static int tvfsDelete(sqlite3_vfs*, const char *zName, int syncDir);
static int tvfsAccess(sqlite3_vfs*, const char *zName, int flags, int *);
static int tvfsFullPathname(sqlite3_vfs*, const char *zName, int, char *zOut);
#ifndef SQLITE_OMIT_LOAD_EXTENSION
static void *tvfsDlOpen(sqlite3_vfs*, const char *zFilename);
static void tvfsDlError(sqlite3_vfs*, int nByte, char *zErrMsg);
static void (*tvfsDlSym(sqlite3_vfs*,void*, const char *zSymbol))(void);
static void tvfsDlClose(sqlite3_vfs*, void*);
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
static int tvfsRandomness(sqlite3_vfs*, int nByte, char *zOut);
static int tvfsSleep(sqlite3_vfs*, int microseconds);
static int tvfsCurrentTime(sqlite3_vfs*, double*);
static int tvfsShmOpen(sqlite3_file*);
static int tvfsShmLock(sqlite3_file*, int , int, int);
static int tvfsShmMap(sqlite3_file*,int,int,int, void volatile **);
static void tvfsShmBarrier(sqlite3_file*);
static int tvfsShmUnmap(sqlite3_file*, int);
static int tvfsFetch(sqlite3_file*, sqlite3_int64, int, void**);
static int tvfsUnfetch(sqlite3_file*, sqlite3_int64, void*);
static sqlite3_io_methods tvfs_io_methods = {
3, /* iVersion */
tvfsClose, /* xClose */
tvfsRead, /* xRead */
tvfsWrite, /* xWrite */
tvfsTruncate, /* xTruncate */
tvfsSync, /* xSync */
tvfsFileSize, /* xFileSize */
tvfsLock, /* xLock */
tvfsUnlock, /* xUnlock */
tvfsCheckReservedLock, /* xCheckReservedLock */
tvfsFileControl, /* xFileControl */
tvfsSectorSize, /* xSectorSize */
tvfsDeviceCharacteristics, /* xDeviceCharacteristics */
tvfsShmMap, /* xShmMap */
tvfsShmLock, /* xShmLock */
tvfsShmBarrier, /* xShmBarrier */
tvfsShmUnmap, /* xShmUnmap */
tvfsFetch,
tvfsUnfetch
};
static int tvfsResultCode(Testvfs *p, int *pRc){
struct errcode {
int eCode;
const char *zCode;
} aCode[] = {
{ SQLITE_OK, "SQLITE_OK" },
{ SQLITE_ERROR, "SQLITE_ERROR" },
{ SQLITE_IOERR, "SQLITE_IOERR" },
{ SQLITE_LOCKED, "SQLITE_LOCKED" },
{ SQLITE_BUSY, "SQLITE_BUSY" },
};
const char *z;
int i;
z = Tcl_GetStringResult(p->interp);
for(i=0; i<ArraySize(aCode); i++){
if( 0==strcmp(z, aCode[i].zCode) ){
*pRc = aCode[i].eCode;
return 1;
}
}
return 0;
}
static int tvfsInjectFault(TestFaultInject *p){
int ret = 0;
if( p->eFault ){
p->iCnt--;
if( p->iCnt==0 || (p->iCnt<0 && p->eFault==FAULT_INJECT_PERSISTENT ) ){
ret = 1;
p->nFail++;
}
}
return ret;
}
static int tvfsInjectIoerr(Testvfs *p){
return tvfsInjectFault(&p->ioerr_err);
}
static int tvfsInjectFullerr(Testvfs *p){
return tvfsInjectFault(&p->full_err);
}
static int tvfsInjectCantopenerr(Testvfs *p){
return tvfsInjectFault(&p->cantopen_err);
}
static void tvfsExecTcl(
Testvfs *p,
const char *zMethod,
Tcl_Obj *arg1,
Tcl_Obj *arg2,
Tcl_Obj *arg3,
Tcl_Obj *arg4
){
int rc; /* Return code from Tcl_EvalObj() */
Tcl_Obj *pEval;
assert( p->pScript );
assert( zMethod );
assert( p );
assert( arg2==0 || arg1!=0 );
assert( arg3==0 || arg2!=0 );
pEval = Tcl_DuplicateObj(p->pScript);
Tcl_IncrRefCount(p->pScript);
Tcl_ListObjAppendElement(p->interp, pEval, Tcl_NewStringObj(zMethod, -1));
if( arg1 ) Tcl_ListObjAppendElement(p->interp, pEval, arg1);
if( arg2 ) Tcl_ListObjAppendElement(p->interp, pEval, arg2);
if( arg3 ) Tcl_ListObjAppendElement(p->interp, pEval, arg3);
if( arg4 ) Tcl_ListObjAppendElement(p->interp, pEval, arg4);
rc = Tcl_EvalObjEx(p->interp, pEval, TCL_EVAL_GLOBAL);
if( rc!=TCL_OK ){
Tcl_BackgroundError(p->interp);
Tcl_ResetResult(p->interp);
}
}
/*
** Close an tvfs-file.
*/
static int tvfsClose(sqlite3_file *pFile){
int rc;
TestvfsFile *pTestfile = (TestvfsFile *)pFile;
TestvfsFd *pFd = pTestfile->pFd;
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_CLOSE_MASK ){
tvfsExecTcl(p, "xClose",
Tcl_NewStringObj(pFd->zFilename, -1), pFd->pShmId, 0, 0
);
}
if( pFd->pShmId ){
Tcl_DecrRefCount(pFd->pShmId);
pFd->pShmId = 0;
}
if( pFile->pMethods ){
ckfree((char *)pFile->pMethods);
}
rc = sqlite3OsClose(pFd->pReal);
ckfree((char *)pFd);
pTestfile->pFd = 0;
return rc;
}
/*
** Read data from an tvfs-file.
*/
static int tvfsRead(
sqlite3_file *pFile,
void *zBuf,
int iAmt,
sqlite_int64 iOfst
){
int rc = SQLITE_OK;
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_READ_MASK ){
tvfsExecTcl(p, "xRead",
Tcl_NewStringObj(pFd->zFilename, -1), pFd->pShmId, 0, 0
);
tvfsResultCode(p, &rc);
}
if( rc==SQLITE_OK && p->mask&TESTVFS_READ_MASK && tvfsInjectIoerr(p) ){
rc = SQLITE_IOERR;
}
if( rc==SQLITE_OK ){
rc = sqlite3OsRead(pFd->pReal, zBuf, iAmt, iOfst);
}
return rc;
}
/*
** Write data to an tvfs-file.
*/
static int tvfsWrite(
sqlite3_file *pFile,
const void *zBuf,
int iAmt,
sqlite_int64 iOfst
){
int rc = SQLITE_OK;
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_WRITE_MASK ){
tvfsExecTcl(p, "xWrite",
Tcl_NewStringObj(pFd->zFilename, -1), pFd->pShmId,
Tcl_NewWideIntObj(iOfst), Tcl_NewIntObj(iAmt)
);
tvfsResultCode(p, &rc);
}
if( rc==SQLITE_OK && tvfsInjectFullerr(p) ){
rc = SQLITE_FULL;
}
if( rc==SQLITE_OK && p->mask&TESTVFS_WRITE_MASK && tvfsInjectIoerr(p) ){
rc = SQLITE_IOERR;
}
if( rc==SQLITE_OK ){
rc = sqlite3OsWrite(pFd->pReal, zBuf, iAmt, iOfst);
}
return rc;
}
/*
** Truncate an tvfs-file.
*/
static int tvfsTruncate(sqlite3_file *pFile, sqlite_int64 size){
int rc = SQLITE_OK;
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_TRUNCATE_MASK ){
tvfsExecTcl(p, "xTruncate",
Tcl_NewStringObj(pFd->zFilename, -1), pFd->pShmId, 0, 0
);
tvfsResultCode(p, &rc);
}
if( rc==SQLITE_OK ){
rc = sqlite3OsTruncate(pFd->pReal, size);
}
return rc;
}
/*
** Sync an tvfs-file.
*/
static int tvfsSync(sqlite3_file *pFile, int flags){
int rc = SQLITE_OK;
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_SYNC_MASK ){
char *zFlags = 0;
switch( flags ){
case SQLITE_SYNC_NORMAL:
zFlags = "normal";
break;
case SQLITE_SYNC_FULL:
zFlags = "full";
break;
case SQLITE_SYNC_NORMAL|SQLITE_SYNC_DATAONLY:
zFlags = "normal|dataonly";
break;
case SQLITE_SYNC_FULL|SQLITE_SYNC_DATAONLY:
zFlags = "full|dataonly";
break;
default:
assert(0);
}
tvfsExecTcl(p, "xSync",
Tcl_NewStringObj(pFd->zFilename, -1), pFd->pShmId,
Tcl_NewStringObj(zFlags, -1), 0
);
tvfsResultCode(p, &rc);
}
if( rc==SQLITE_OK && tvfsInjectFullerr(p) ) rc = SQLITE_FULL;
if( rc==SQLITE_OK ){
rc = sqlite3OsSync(pFd->pReal, flags);
}
return rc;
}
/*
** Return the current file-size of an tvfs-file.
*/
static int tvfsFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
TestvfsFd *p = tvfsGetFd(pFile);
return sqlite3OsFileSize(p->pReal, pSize);
}
/*
** Lock an tvfs-file.
*/
static int tvfsLock(sqlite3_file *pFile, int eLock){
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_LOCK_MASK ){
char zLock[30];
sqlite3_snprintf(sizeof(zLock),zLock,"%d",eLock);
tvfsExecTcl(p, "xLock", Tcl_NewStringObj(pFd->zFilename, -1),
Tcl_NewStringObj(zLock, -1), 0, 0);
}
return sqlite3OsLock(pFd->pReal, eLock);
}
/*
** Unlock an tvfs-file.
*/
static int tvfsUnlock(sqlite3_file *pFile, int eLock){
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_UNLOCK_MASK ){
char zLock[30];
sqlite3_snprintf(sizeof(zLock),zLock,"%d",eLock);
tvfsExecTcl(p, "xUnlock", Tcl_NewStringObj(pFd->zFilename, -1),
Tcl_NewStringObj(zLock, -1), 0, 0);
}
if( p->mask&TESTVFS_WRITE_MASK && tvfsInjectIoerr(p) ){
return SQLITE_IOERR_UNLOCK;
}
return sqlite3OsUnlock(pFd->pReal, eLock);
}
/*
** Check if another file-handle holds a RESERVED lock on an tvfs-file.
*/
static int tvfsCheckReservedLock(sqlite3_file *pFile, int *pResOut){
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_CKLOCK_MASK ){
tvfsExecTcl(p, "xCheckReservedLock", Tcl_NewStringObj(pFd->zFilename, -1),
0, 0, 0);
}
return sqlite3OsCheckReservedLock(pFd->pReal, pResOut);
}
/*
** File control method. For custom operations on an tvfs-file.
*/
static int tvfsFileControl(sqlite3_file *pFile, int op, void *pArg){
TestvfsFd *p = tvfsGetFd(pFile);
if( op==SQLITE_FCNTL_PRAGMA ){
char **argv = (char**)pArg;
if( sqlite3_stricmp(argv[1],"error")==0 ){
int rc = SQLITE_ERROR;
if( argv[2] ){
const char *z = argv[2];
int x = atoi(z);
if( x ){
rc = x;
while( sqlite3Isdigit(z[0]) ){ z++; }
while( sqlite3Isspace(z[0]) ){ z++; }
}
if( z[0] ) argv[0] = sqlite3_mprintf("%s", z);
}
return rc;
}
if( sqlite3_stricmp(argv[1], "filename")==0 ){
argv[0] = sqlite3_mprintf("%s", p->zFilename);
return SQLITE_OK;
}
}
return sqlite3OsFileControl(p->pReal, op, pArg);
}
/*
** Return the sector-size in bytes for an tvfs-file.
*/
static int tvfsSectorSize(sqlite3_file *pFile){
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->iSectorsize>=0 ){
return p->iSectorsize;
}
return sqlite3OsSectorSize(pFd->pReal);
}
/*
** Return the device characteristic flags supported by an tvfs-file.
*/
static int tvfsDeviceCharacteristics(sqlite3_file *pFile){
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)pFd->pVfs->pAppData;
if( p->iDevchar>=0 ){
return p->iDevchar;
}
return sqlite3OsDeviceCharacteristics(pFd->pReal);
}
/*
** Open an tvfs file handle.
*/
static int tvfsOpen(
sqlite3_vfs *pVfs,
const char *zName,
sqlite3_file *pFile,
int flags,
int *pOutFlags
){
int rc;
TestvfsFile *pTestfile = (TestvfsFile *)pFile;
TestvfsFd *pFd;
Tcl_Obj *pId = 0;
Testvfs *p = (Testvfs *)pVfs->pAppData;
pFd = (TestvfsFd *)ckalloc(sizeof(TestvfsFd) + PARENTVFS(pVfs)->szOsFile);
memset(pFd, 0, sizeof(TestvfsFd) + PARENTVFS(pVfs)->szOsFile);
pFd->pShm = 0;
pFd->pShmId = 0;
pFd->zFilename = zName;
pFd->pVfs = pVfs;
pFd->pReal = (sqlite3_file *)&pFd[1];
memset(pTestfile, 0, sizeof(TestvfsFile));
pTestfile->pFd = pFd;
/* Evaluate the Tcl script:
**
** SCRIPT xOpen FILENAME KEY-VALUE-ARGS
**
** If the script returns an SQLite error code other than SQLITE_OK, an
** error is returned to the caller. If it returns SQLITE_OK, the new
** connection is named "anon". Otherwise, the value returned by the
** script is used as the connection name.
*/
Tcl_ResetResult(p->interp);
if( p->pScript && p->mask&TESTVFS_OPEN_MASK ){
Tcl_Obj *pArg = Tcl_NewObj();
Tcl_IncrRefCount(pArg);
if( flags&SQLITE_OPEN_MAIN_DB ){
const char *z = &zName[strlen(zName)+1];
while( *z ){
Tcl_ListObjAppendElement(0, pArg, Tcl_NewStringObj(z, -1));
z += strlen(z) + 1;
Tcl_ListObjAppendElement(0, pArg, Tcl_NewStringObj(z, -1));
z += strlen(z) + 1;
}
}
tvfsExecTcl(p, "xOpen", Tcl_NewStringObj(pFd->zFilename, -1), pArg, 0, 0);
Tcl_DecrRefCount(pArg);
if( tvfsResultCode(p, &rc) ){
if( rc!=SQLITE_OK ) return rc;
}else{
pId = Tcl_GetObjResult(p->interp);
}
}
if( (p->mask&TESTVFS_OPEN_MASK) && tvfsInjectIoerr(p) ) return SQLITE_IOERR;
if( tvfsInjectCantopenerr(p) ) return SQLITE_CANTOPEN;
if( tvfsInjectFullerr(p) ) return SQLITE_FULL;
if( !pId ){
pId = Tcl_NewStringObj("anon", -1);
}
Tcl_IncrRefCount(pId);
pFd->pShmId = pId;
Tcl_ResetResult(p->interp);
rc = sqlite3OsOpen(PARENTVFS(pVfs), zName, pFd->pReal, flags, pOutFlags);
if( pFd->pReal->pMethods ){
sqlite3_io_methods *pMethods;
int nByte;
if( pVfs->iVersion>1 ){
nByte = sizeof(sqlite3_io_methods);
}else{
nByte = offsetof(sqlite3_io_methods, xShmMap);
}
pMethods = (sqlite3_io_methods *)ckalloc(nByte);
memcpy(pMethods, &tvfs_io_methods, nByte);
pMethods->iVersion = pFd->pReal->pMethods->iVersion;
if( pMethods->iVersion>pVfs->iVersion ){
pMethods->iVersion = pVfs->iVersion;
}
if( pVfs->iVersion>1 && ((Testvfs *)pVfs->pAppData)->isNoshm ){
pMethods->xShmUnmap = 0;
pMethods->xShmLock = 0;
pMethods->xShmBarrier = 0;
pMethods->xShmMap = 0;
}
pFile->pMethods = pMethods;
}
return rc;
}
/*
** Delete the file located at zPath. If the dirSync argument is true,
** ensure the file-system modifications are synced to disk before
** returning.
*/
static int tvfsDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
int rc = SQLITE_OK;
Testvfs *p = (Testvfs *)pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_DELETE_MASK ){
tvfsExecTcl(p, "xDelete",
Tcl_NewStringObj(zPath, -1), Tcl_NewIntObj(dirSync), 0, 0
);
tvfsResultCode(p, &rc);
}
if( rc==SQLITE_OK ){
rc = sqlite3OsDelete(PARENTVFS(pVfs), zPath, dirSync);
}
return rc;
}
/*
** Test for access permissions. Return true if the requested permission
** is available, or false otherwise.
*/
static int tvfsAccess(
sqlite3_vfs *pVfs,
const char *zPath,
int flags,
int *pResOut
){
Testvfs *p = (Testvfs *)pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_ACCESS_MASK ){
int rc;
char *zArg = 0;
if( flags==SQLITE_ACCESS_EXISTS ) zArg = "SQLITE_ACCESS_EXISTS";
if( flags==SQLITE_ACCESS_READWRITE ) zArg = "SQLITE_ACCESS_READWRITE";
if( flags==SQLITE_ACCESS_READ ) zArg = "SQLITE_ACCESS_READ";
tvfsExecTcl(p, "xAccess",
Tcl_NewStringObj(zPath, -1), Tcl_NewStringObj(zArg, -1), 0, 0
);
if( tvfsResultCode(p, &rc) ){
if( rc!=SQLITE_OK ) return rc;
}else{
Tcl_Interp *interp = p->interp;
if( TCL_OK==Tcl_GetBooleanFromObj(0, Tcl_GetObjResult(interp), pResOut) ){
return SQLITE_OK;
}
}
}
return sqlite3OsAccess(PARENTVFS(pVfs), zPath, flags, pResOut);
}
/*
** Populate buffer zOut with the full canonical pathname corresponding
** to the pathname in zPath. zOut is guaranteed to point to a buffer
** of at least (DEVSYM_MAX_PATHNAME+1) bytes.
*/
static int tvfsFullPathname(
sqlite3_vfs *pVfs,
const char *zPath,
int nOut,
char *zOut
){
Testvfs *p = (Testvfs *)pVfs->pAppData;
if( p->pScript && p->mask&TESTVFS_FULLPATHNAME_MASK ){
int rc;
tvfsExecTcl(p, "xFullPathname", Tcl_NewStringObj(zPath, -1), 0, 0, 0);
if( tvfsResultCode(p, &rc) ){
if( rc!=SQLITE_OK ) return rc;
}
}
return sqlite3OsFullPathname(PARENTVFS(pVfs), zPath, nOut, zOut);
}
#ifndef SQLITE_OMIT_LOAD_EXTENSION
/*
** Open the dynamic library located at zPath and return a handle.
*/
static void *tvfsDlOpen(sqlite3_vfs *pVfs, const char *zPath){
return sqlite3OsDlOpen(PARENTVFS(pVfs), zPath);
}
/*
** Populate the buffer zErrMsg (size nByte bytes) with a human readable
** utf-8 string describing the most recent error encountered associated
** with dynamic libraries.
*/
static void tvfsDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
sqlite3OsDlError(PARENTVFS(pVfs), nByte, zErrMsg);
}
/*
** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
*/
static void (*tvfsDlSym(sqlite3_vfs *pVfs, void *p, const char *zSym))(void){
return sqlite3OsDlSym(PARENTVFS(pVfs), p, zSym);
}
/*
** Close the dynamic library handle pHandle.
*/
static void tvfsDlClose(sqlite3_vfs *pVfs, void *pHandle){
sqlite3OsDlClose(PARENTVFS(pVfs), pHandle);
}
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
/*
** Populate the buffer pointed to by zBufOut with nByte bytes of
** random data.
*/
static int tvfsRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
return sqlite3OsRandomness(PARENTVFS(pVfs), nByte, zBufOut);
}
/*
** Sleep for nMicro microseconds. Return the number of microseconds
** actually slept.
*/
static int tvfsSleep(sqlite3_vfs *pVfs, int nMicro){
return sqlite3OsSleep(PARENTVFS(pVfs), nMicro);
}
/*
** Return the current time as a Julian Day number in *pTimeOut.
*/
static int tvfsCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
return PARENTVFS(pVfs)->xCurrentTime(PARENTVFS(pVfs), pTimeOut);
}
static int tvfsShmOpen(sqlite3_file *pFile){
Testvfs *p;
int rc = SQLITE_OK; /* Return code */
TestvfsBuffer *pBuffer; /* Buffer to open connection to */
TestvfsFd *pFd; /* The testvfs file structure */
pFd = tvfsGetFd(pFile);
p = (Testvfs *)pFd->pVfs->pAppData;
assert( 0==p->isFullshm );
assert( pFd->pShmId && pFd->pShm==0 && pFd->pNext==0 );
/* Evaluate the Tcl script:
**
** SCRIPT xShmOpen FILENAME
*/
Tcl_ResetResult(p->interp);
if( p->pScript && p->mask&TESTVFS_SHMOPEN_MASK ){
tvfsExecTcl(p, "xShmOpen", Tcl_NewStringObj(pFd->zFilename, -1), 0, 0, 0);
if( tvfsResultCode(p, &rc) ){
if( rc!=SQLITE_OK ) return rc;
}
}
assert( rc==SQLITE_OK );
if( p->mask&TESTVFS_SHMOPEN_MASK && tvfsInjectIoerr(p) ){
return SQLITE_IOERR;
}
/* Search for a TestvfsBuffer. Create a new one if required. */
for(pBuffer=p->pBuffer; pBuffer; pBuffer=pBuffer->pNext){
if( 0==strcmp(pFd->zFilename, pBuffer->zFile) ) break;
}
if( !pBuffer ){
int szName = (int)strlen(pFd->zFilename);
int nByte = sizeof(TestvfsBuffer) + szName + 1;
pBuffer = (TestvfsBuffer *)ckalloc(nByte);
memset(pBuffer, 0, nByte);
pBuffer->zFile = (char *)&pBuffer[1];
memcpy(pBuffer->zFile, pFd->zFilename, szName+1);
pBuffer->pNext = p->pBuffer;
p->pBuffer = pBuffer;
}
/* Connect the TestvfsBuffer to the new TestvfsShm handle and return. */
pFd->pNext = pBuffer->pFile;
pBuffer->pFile = pFd;
pFd->pShm = pBuffer;
return SQLITE_OK;
}
static void tvfsAllocPage(TestvfsBuffer *p, int iPage, int pgsz){
assert( iPage<TESTVFS_MAX_PAGES );
if( p->aPage[iPage]==0 ){
p->aPage[iPage] = (u8 *)ckalloc(pgsz);
memset(p->aPage[iPage], 0, pgsz);
p->pgsz = pgsz;
}
}
static int tvfsShmMap(
sqlite3_file *pFile, /* Handle open on database file */
int iPage, /* Page to retrieve */
int pgsz, /* Size of pages */
int isWrite, /* True to extend file if necessary */
void volatile **pp /* OUT: Mapped memory */
){
int rc = SQLITE_OK;
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
if( p->isFullshm ){
return sqlite3OsShmMap(pFd->pReal, iPage, pgsz, isWrite, pp);
}
if( 0==pFd->pShm ){
rc = tvfsShmOpen(pFile);
if( rc!=SQLITE_OK ){
return rc;
}
}
if( p->pScript && p->mask&TESTVFS_SHMMAP_MASK ){
Tcl_Obj *pArg = Tcl_NewObj();
Tcl_IncrRefCount(pArg);
Tcl_ListObjAppendElement(p->interp, pArg, Tcl_NewIntObj(iPage));
Tcl_ListObjAppendElement(p->interp, pArg, Tcl_NewIntObj(pgsz));
Tcl_ListObjAppendElement(p->interp, pArg, Tcl_NewIntObj(isWrite));
tvfsExecTcl(p, "xShmMap",
Tcl_NewStringObj(pFd->pShm->zFile, -1), pFd->pShmId, pArg, 0
);
tvfsResultCode(p, &rc);
Tcl_DecrRefCount(pArg);
}
if( rc==SQLITE_OK && p->mask&TESTVFS_SHMMAP_MASK && tvfsInjectIoerr(p) ){
rc = SQLITE_IOERR;
}
if( rc==SQLITE_OK && isWrite && !pFd->pShm->aPage[iPage] ){
tvfsAllocPage(pFd->pShm, iPage, pgsz);
}
*pp = (void volatile *)pFd->pShm->aPage[iPage];
return rc;
}
static int tvfsShmLock(
sqlite3_file *pFile,
int ofst,
int n,
int flags
){
int rc = SQLITE_OK;
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
int nLock;
char zLock[80];
if( p->isFullshm ){
return sqlite3OsShmLock(pFd->pReal, ofst, n, flags);
}
if( p->pScript && p->mask&TESTVFS_SHMLOCK_MASK ){
sqlite3_snprintf(sizeof(zLock), zLock, "%d %d", ofst, n);
nLock = (int)strlen(zLock);
if( flags & SQLITE_SHM_LOCK ){
strcpy(&zLock[nLock], " lock");
}else{
strcpy(&zLock[nLock], " unlock");
}
nLock += (int)strlen(&zLock[nLock]);
if( flags & SQLITE_SHM_SHARED ){
strcpy(&zLock[nLock], " shared");
}else{
strcpy(&zLock[nLock], " exclusive");
}
tvfsExecTcl(p, "xShmLock",
Tcl_NewStringObj(pFd->pShm->zFile, -1), pFd->pShmId,
Tcl_NewStringObj(zLock, -1), 0
);
tvfsResultCode(p, &rc);
}
if( rc==SQLITE_OK && p->mask&TESTVFS_SHMLOCK_MASK && tvfsInjectIoerr(p) ){
rc = SQLITE_IOERR;
}
if( rc==SQLITE_OK ){
int isLock = (flags & SQLITE_SHM_LOCK);
int isExcl = (flags & SQLITE_SHM_EXCLUSIVE);
u32 mask = (((1<<n)-1) << ofst);
if( isLock ){
TestvfsFd *p2;
for(p2=pFd->pShm->pFile; p2; p2=p2->pNext){
if( p2==pFd ) continue;
if( (p2->excllock&mask) || (isExcl && p2->sharedlock&mask) ){
rc = SQLITE_BUSY;
break;
}
}
if( rc==SQLITE_OK ){
if( isExcl ) pFd->excllock |= mask;
if( !isExcl ) pFd->sharedlock |= mask;
}
}else{
if( isExcl ) pFd->excllock &= (~mask);
if( !isExcl ) pFd->sharedlock &= (~mask);
}
}
return rc;
}
static void tvfsShmBarrier(sqlite3_file *pFile){
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
if( p->pScript && p->mask&TESTVFS_SHMBARRIER_MASK ){
const char *z = pFd->pShm ? pFd->pShm->zFile : "";
tvfsExecTcl(p, "xShmBarrier", Tcl_NewStringObj(z, -1), pFd->pShmId, 0, 0);
}
if( p->isFullshm ){
sqlite3OsShmBarrier(pFd->pReal);
return;
}
}
static int tvfsShmUnmap(
sqlite3_file *pFile,
int deleteFlag
){
int rc = SQLITE_OK;
TestvfsFd *pFd = tvfsGetFd(pFile);
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
TestvfsBuffer *pBuffer = pFd->pShm;
TestvfsFd **ppFd;
if( p->isFullshm ){
return sqlite3OsShmUnmap(pFd->pReal, deleteFlag);
}
if( !pBuffer ) return SQLITE_OK;
assert( pFd->pShmId && pFd->pShm );
if( p->pScript && p->mask&TESTVFS_SHMCLOSE_MASK ){
tvfsExecTcl(p, "xShmUnmap",
Tcl_NewStringObj(pFd->pShm->zFile, -1), pFd->pShmId, 0, 0
);
tvfsResultCode(p, &rc);
}
for(ppFd=&pBuffer->pFile; *ppFd!=pFd; ppFd=&((*ppFd)->pNext));
assert( (*ppFd)==pFd );
*ppFd = pFd->pNext;
pFd->pNext = 0;
if( pBuffer->pFile==0 ){
int i;
TestvfsBuffer **pp;
for(pp=&p->pBuffer; *pp!=pBuffer; pp=&((*pp)->pNext));
*pp = (*pp)->pNext;
for(i=0; pBuffer->aPage[i]; i++){
ckfree((char *)pBuffer->aPage[i]);
}
ckfree((char *)pBuffer);
}
pFd->pShm = 0;
return rc;
}
static int tvfsFetch(
sqlite3_file *pFile,
sqlite3_int64 iOfst,
int iAmt,
void **pp
){
TestvfsFd *pFd = tvfsGetFd(pFile);
return sqlite3OsFetch(pFd->pReal, iOfst, iAmt, pp);
}
static int tvfsUnfetch(sqlite3_file *pFile, sqlite3_int64 iOfst, void *p){
TestvfsFd *pFd = tvfsGetFd(pFile);
return sqlite3OsUnfetch(pFd->pReal, iOfst, p);
}
static int testvfs_obj_cmd(
ClientData cd,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
Testvfs *p = (Testvfs *)cd;
enum DB_enum {
CMD_SHM, CMD_DELETE, CMD_FILTER, CMD_IOERR, CMD_SCRIPT,
CMD_DEVCHAR, CMD_SECTORSIZE, CMD_FULLERR, CMD_CANTOPENERR
};
struct TestvfsSubcmd {
char *zName;
enum DB_enum eCmd;
} aSubcmd[] = {
{ "shm", CMD_SHM },
{ "delete", CMD_DELETE },
{ "filter", CMD_FILTER },
{ "ioerr", CMD_IOERR },
{ "fullerr", CMD_FULLERR },
{ "cantopenerr", CMD_CANTOPENERR },
{ "script", CMD_SCRIPT },
{ "devchar", CMD_DEVCHAR },
{ "sectorsize", CMD_SECTORSIZE },
{ 0, 0 }
};
int i;
if( objc<2 ){
Tcl_WrongNumArgs(interp, 1, objv, "SUBCOMMAND ...");
return TCL_ERROR;
}
if( Tcl_GetIndexFromObjStruct(
interp, objv[1], aSubcmd, sizeof(aSubcmd[0]), "subcommand", 0, &i)
){
return TCL_ERROR;
}
Tcl_ResetResult(interp);
switch( aSubcmd[i].eCmd ){
case CMD_SHM: {
Tcl_Obj *pObj;
int rc;
TestvfsBuffer *pBuffer;
char *zName;
if( objc!=3 && objc!=4 ){
Tcl_WrongNumArgs(interp, 2, objv, "FILE ?VALUE?");
return TCL_ERROR;
}
zName = ckalloc(p->pParent->mxPathname);
rc = p->pParent->xFullPathname(
p->pParent, Tcl_GetString(objv[2]),
p->pParent->mxPathname, zName
);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, "failed to get full path: ",
Tcl_GetString(objv[2]), 0);
ckfree(zName);
return TCL_ERROR;
}
for(pBuffer=p->pBuffer; pBuffer; pBuffer=pBuffer->pNext){
if( 0==strcmp(pBuffer->zFile, zName) ) break;
}
ckfree(zName);
if( !pBuffer ){
Tcl_AppendResult(interp, "no such file: ", Tcl_GetString(objv[2]), 0);
return TCL_ERROR;
}
if( objc==4 ){
int n;
u8 *a = Tcl_GetByteArrayFromObj(objv[3], &n);
int pgsz = pBuffer->pgsz;
if( pgsz==0 ) pgsz = 65536;
for(i=0; i*pgsz<n; i++){
int nByte = pgsz;
tvfsAllocPage(pBuffer, i, pgsz);
if( n-i*pgsz<pgsz ){
nByte = n;
}
memcpy(pBuffer->aPage[i], &a[i*pgsz], nByte);
}
}
pObj = Tcl_NewObj();
for(i=0; pBuffer->aPage[i]; i++){
int pgsz = pBuffer->pgsz;
if( pgsz==0 ) pgsz = 65536;
Tcl_AppendObjToObj(pObj, Tcl_NewByteArrayObj(pBuffer->aPage[i], pgsz));
}
Tcl_SetObjResult(interp, pObj);
break;
}
/* TESTVFS filter METHOD-LIST
**
** Activate special processing for those methods contained in the list
*/
case CMD_FILTER: {
static struct VfsMethod {
char *zName;
int mask;
} vfsmethod [] = {
{ "xShmOpen", TESTVFS_SHMOPEN_MASK },
{ "xShmLock", TESTVFS_SHMLOCK_MASK },
{ "xShmBarrier", TESTVFS_SHMBARRIER_MASK },
{ "xShmUnmap", TESTVFS_SHMCLOSE_MASK },
{ "xShmMap", TESTVFS_SHMMAP_MASK },
{ "xSync", TESTVFS_SYNC_MASK },
{ "xDelete", TESTVFS_DELETE_MASK },
{ "xWrite", TESTVFS_WRITE_MASK },
{ "xRead", TESTVFS_READ_MASK },
{ "xTruncate", TESTVFS_TRUNCATE_MASK },
{ "xOpen", TESTVFS_OPEN_MASK },
{ "xClose", TESTVFS_CLOSE_MASK },
{ "xAccess", TESTVFS_ACCESS_MASK },
{ "xFullPathname", TESTVFS_FULLPATHNAME_MASK },
{ "xUnlock", TESTVFS_UNLOCK_MASK },
{ "xLock", TESTVFS_LOCK_MASK },
{ "xCheckReservedLock", TESTVFS_CKLOCK_MASK },
};
Tcl_Obj **apElem = 0;
int nElem = 0;
int mask = 0;
if( objc!=3 ){
Tcl_WrongNumArgs(interp, 2, objv, "LIST");
return TCL_ERROR;
}
if( Tcl_ListObjGetElements(interp, objv[2], &nElem, &apElem) ){
return TCL_ERROR;
}
Tcl_ResetResult(interp);
for(i=0; i<nElem; i++){
int iMethod;
char *zElem = Tcl_GetString(apElem[i]);
for(iMethod=0; iMethod<ArraySize(vfsmethod); iMethod++){
if( strcmp(zElem, vfsmethod[iMethod].zName)==0 ){
mask |= vfsmethod[iMethod].mask;
break;
}
}
if( iMethod==ArraySize(vfsmethod) ){
Tcl_AppendResult(interp, "unknown method: ", zElem, 0);
return TCL_ERROR;
}
}
p->mask = mask;
break;
}
/*
** TESTVFS script ?SCRIPT?
**
** Query or set the script to be run when filtered VFS events
** occur.
*/
case CMD_SCRIPT: {
if( objc==3 ){
int nByte;
if( p->pScript ){
Tcl_DecrRefCount(p->pScript);
p->pScript = 0;
}
Tcl_GetStringFromObj(objv[2], &nByte);
if( nByte>0 ){
p->pScript = Tcl_DuplicateObj(objv[2]);
Tcl_IncrRefCount(p->pScript);
}
}else if( objc!=2 ){
Tcl_WrongNumArgs(interp, 2, objv, "?SCRIPT?");
return TCL_ERROR;
}
Tcl_ResetResult(interp);
if( p->pScript ) Tcl_SetObjResult(interp, p->pScript);
break;
}
/*
** TESTVFS ioerr ?IFAIL PERSIST?
**
** Where IFAIL is an integer and PERSIST is boolean.
*/
case CMD_CANTOPENERR:
case CMD_IOERR:
case CMD_FULLERR: {
TestFaultInject *pTest = 0;
int iRet;
switch( aSubcmd[i].eCmd ){
case CMD_IOERR: pTest = &p->ioerr_err; break;
case CMD_FULLERR: pTest = &p->full_err; break;
case CMD_CANTOPENERR: pTest = &p->cantopen_err; break;
default: assert(0);
}
iRet = pTest->nFail;
pTest->nFail = 0;
pTest->eFault = 0;
pTest->iCnt = 0;
if( objc==4 ){
int iCnt, iPersist;
if( TCL_OK!=Tcl_GetIntFromObj(interp, objv[2], &iCnt)
|| TCL_OK!=Tcl_GetBooleanFromObj(interp, objv[3], &iPersist)
){
return TCL_ERROR;
}
pTest->eFault = iPersist?FAULT_INJECT_PERSISTENT:FAULT_INJECT_TRANSIENT;
pTest->iCnt = iCnt;
}else if( objc!=2 ){
Tcl_WrongNumArgs(interp, 2, objv, "?CNT PERSIST?");
return TCL_ERROR;
}
Tcl_SetObjResult(interp, Tcl_NewIntObj(iRet));
break;
}
case CMD_DELETE: {
Tcl_DeleteCommand(interp, Tcl_GetString(objv[0]));
break;
}
case CMD_DEVCHAR: {
struct DeviceFlag {
char *zName;
int iValue;
} aFlag[] = {
{ "default", -1 },
{ "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 },
{ "undeletable_when_open", SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN },
{ "powersafe_overwrite", SQLITE_IOCAP_POWERSAFE_OVERWRITE },
{ "immutable", SQLITE_IOCAP_IMMUTABLE },
{ 0, 0 }
};
Tcl_Obj *pRet;
int iFlag;
if( objc>3 ){
Tcl_WrongNumArgs(interp, 2, objv, "?ATTR-LIST?");
return TCL_ERROR;
}
if( objc==3 ){
int j;
int iNew = 0;
Tcl_Obj **flags = 0;
int nFlags = 0;
if( Tcl_ListObjGetElements(interp, objv[2], &nFlags, &flags) ){
return TCL_ERROR;
}
for(j=0; j<nFlags; j++){
int idx = 0;
if( Tcl_GetIndexFromObjStruct(interp, flags[j], aFlag,
sizeof(aFlag[0]), "flag", 0, &idx)
){
return TCL_ERROR;
}
if( aFlag[idx].iValue<0 && nFlags>1 ){
Tcl_AppendResult(interp, "bad flags: ", Tcl_GetString(objv[2]), 0);
return TCL_ERROR;
}
iNew |= aFlag[idx].iValue;
}
p->iDevchar = iNew| 0x10000000;
}
pRet = Tcl_NewObj();
for(iFlag=0; iFlag<sizeof(aFlag)/sizeof(aFlag[0]); iFlag++){
if( p->iDevchar & aFlag[iFlag].iValue ){
Tcl_ListObjAppendElement(
interp, pRet, Tcl_NewStringObj(aFlag[iFlag].zName, -1)
);
}
}
Tcl_SetObjResult(interp, pRet);
break;
}
case CMD_SECTORSIZE: {
if( objc>3 ){
Tcl_WrongNumArgs(interp, 2, objv, "?VALUE?");
return TCL_ERROR;
}
if( objc==3 ){
int iNew = 0;
if( Tcl_GetIntFromObj(interp, objv[2], &iNew) ){
return TCL_ERROR;
}
p->iSectorsize = iNew;
}
Tcl_SetObjResult(interp, Tcl_NewIntObj(p->iSectorsize));
break;
}
}
return TCL_OK;
}
static void testvfs_obj_del(ClientData cd){
Testvfs *p = (Testvfs *)cd;
if( p->pScript ) Tcl_DecrRefCount(p->pScript);
sqlite3_vfs_unregister(p->pVfs);
ckfree((char *)p->pVfs);
ckfree((char *)p);
}
/*
** Usage: testvfs VFSNAME ?SWITCHES?
**
** Switches are:
**
** -noshm BOOLEAN (True to omit shm methods. Default false)
** -default BOOLEAN (True to make the vfs default. Default false)
**
** This command creates two things when it is invoked: an SQLite VFS, and
** a Tcl command. Both are named VFSNAME. The VFS is installed. It is not
** installed as the default VFS.
**
** The VFS passes all file I/O calls through to the underlying VFS.
**
** Whenever the xShmMap method of the VFS
** is invoked, the SCRIPT is executed as follows:
**
** SCRIPT xShmMap FILENAME ID
**
** The value returned by the invocation of SCRIPT above is interpreted as
** an SQLite error code and returned to SQLite. Either a symbolic
** "SQLITE_OK" or numeric "0" value may be returned.
**
** The contents of the shared-memory buffer associated with a given file
** may be read and set using the following command:
**
** VFSNAME shm FILENAME ?NEWVALUE?
**
** When the xShmLock method is invoked by SQLite, the following script is
** run:
**
** SCRIPT xShmLock FILENAME ID LOCK
**
** where LOCK is of the form "OFFSET NBYTE lock/unlock shared/exclusive"
*/
static int testvfs_cmd(
ClientData cd,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
static sqlite3_vfs tvfs_vfs = {
3, /* iVersion */
0, /* szOsFile */
0, /* mxPathname */
0, /* pNext */
0, /* zName */
0, /* pAppData */
tvfsOpen, /* xOpen */
tvfsDelete, /* xDelete */
tvfsAccess, /* xAccess */
tvfsFullPathname, /* xFullPathname */
#ifndef SQLITE_OMIT_LOAD_EXTENSION
tvfsDlOpen, /* xDlOpen */
tvfsDlError, /* xDlError */
tvfsDlSym, /* xDlSym */
tvfsDlClose, /* xDlClose */
#else
0, /* xDlOpen */
0, /* xDlError */
0, /* xDlSym */
0, /* xDlClose */
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
tvfsRandomness, /* xRandomness */
tvfsSleep, /* xSleep */
tvfsCurrentTime, /* xCurrentTime */
0, /* xGetLastError */
0, /* xCurrentTimeInt64 */
0, /* xSetSystemCall */
0, /* xGetSystemCall */
0, /* xNextSystemCall */
};
Testvfs *p; /* New object */
sqlite3_vfs *pVfs; /* New VFS */
char *zVfs;
int nByte; /* Bytes of space to allocate at p */
int i;
int isNoshm = 0; /* True if -noshm is passed */
int isFullshm = 0; /* True if -fullshm is passed */
int isDefault = 0; /* True if -default is passed */
int szOsFile = 0; /* Value passed to -szosfile */
int mxPathname = -1; /* Value passed to -mxpathname */
int iVersion = 3; /* Value passed to -iversion */
if( objc<2 || 0!=(objc%2) ) goto bad_args;
for(i=2; i<objc; i += 2){
int nSwitch;
char *zSwitch;
zSwitch = Tcl_GetStringFromObj(objv[i], &nSwitch);
if( nSwitch>2 && 0==strncmp("-noshm", zSwitch, nSwitch) ){
if( Tcl_GetBooleanFromObj(interp, objv[i+1], &isNoshm) ){
return TCL_ERROR;
}
if( isNoshm ) isFullshm = 0;
}
else if( nSwitch>2 && 0==strncmp("-default", zSwitch, nSwitch) ){
if( Tcl_GetBooleanFromObj(interp, objv[i+1], &isDefault) ){
return TCL_ERROR;
}
}
else if( nSwitch>2 && 0==strncmp("-szosfile", zSwitch, nSwitch) ){
if( Tcl_GetIntFromObj(interp, objv[i+1], &szOsFile) ){
return TCL_ERROR;
}
}
else if( nSwitch>2 && 0==strncmp("-mxpathname", zSwitch, nSwitch) ){
if( Tcl_GetIntFromObj(interp, objv[i+1], &mxPathname) ){
return TCL_ERROR;
}
}
else if( nSwitch>2 && 0==strncmp("-iversion", zSwitch, nSwitch) ){
if( Tcl_GetIntFromObj(interp, objv[i+1], &iVersion) ){
return TCL_ERROR;
}
}
else if( nSwitch>2 && 0==strncmp("-fullshm", zSwitch, nSwitch) ){
if( Tcl_GetBooleanFromObj(interp, objv[i+1], &isFullshm) ){
return TCL_ERROR;
}
if( isFullshm ) isNoshm = 0;
}
else{
goto bad_args;
}
}
if( szOsFile<sizeof(TestvfsFile) ){
szOsFile = sizeof(TestvfsFile);
}
zVfs = Tcl_GetString(objv[1]);
nByte = sizeof(Testvfs) + (int)strlen(zVfs)+1;
p = (Testvfs *)ckalloc(nByte);
memset(p, 0, nByte);
p->iDevchar = -1;
p->iSectorsize = -1;
/* Create the new object command before querying SQLite for a default VFS
** to use for 'real' IO operations. This is because creating the new VFS
** may delete an existing [testvfs] VFS of the same name. If such a VFS
** is currently the default, the new [testvfs] may end up calling the
** methods of a deleted object.
*/
Tcl_CreateObjCommand(interp, zVfs, testvfs_obj_cmd, p, testvfs_obj_del);
p->pParent = sqlite3_vfs_find(0);
p->interp = interp;
p->zName = (char *)&p[1];
memcpy(p->zName, zVfs, strlen(zVfs)+1);
pVfs = (sqlite3_vfs *)ckalloc(sizeof(sqlite3_vfs));
memcpy(pVfs, &tvfs_vfs, sizeof(sqlite3_vfs));
pVfs->pAppData = (void *)p;
pVfs->iVersion = iVersion;
pVfs->zName = p->zName;
pVfs->mxPathname = p->pParent->mxPathname;
if( mxPathname>=0 && mxPathname<pVfs->mxPathname ){
pVfs->mxPathname = mxPathname;
}
pVfs->szOsFile = szOsFile;
p->pVfs = pVfs;
p->isNoshm = isNoshm;
p->isFullshm = isFullshm;
p->mask = TESTVFS_ALL_MASK;
sqlite3_vfs_register(pVfs, isDefault);
return TCL_OK;
bad_args:
Tcl_WrongNumArgs(interp, 1, objv, "VFSNAME ?-noshm BOOL? ?-fullshm BOOL? ?-default BOOL? ?-mxpathname INT? ?-szosfile INT? ?-iversion INT?");
return TCL_ERROR;
}
int Sqlitetestvfs_Init(Tcl_Interp *interp){
Tcl_CreateObjCommand(interp, "testvfs", testvfs_cmd, 0, 0);
return TCL_OK;
}
#endif
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