/*
** 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.
**
******************************************************************************
**
*/
#if SQLITE_TEST /* This file is used for testing only */
#include "sqlite3.h"
#include "sqliteInt.h"
typedef struct Testvfs Testvfs;
typedef struct TestvfsShm TestvfsShm;
typedef struct TestvfsBuffer TestvfsBuffer;
typedef struct TestvfsFile TestvfsFile;
/*
** An open file handle.
*/
struct TestvfsFile {
sqlite3_file base; /* Base class. Must be first */
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 */
};
/*
** 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 */
int nScript; /* Number of elements in array apScript */
Tcl_Obj **apScript; /* Script to execute */
TestvfsBuffer *pBuffer; /* List of shared buffers */
int isNoshm;
};
/*
** A shared-memory buffer.
*/
struct TestvfsBuffer {
char *zFile; /* Associated file name */
int n; /* Size of allocated buffer in bytes */
u8 *a; /* Buffer allocated using ckalloc() */
int nRef; /* Number of references to this object */
TestvfsBuffer *pNext; /* Next in linked list of all buffers */
};
#define PARENTVFS(x) (((Testvfs *)((x)->pAppData))->pParent)
/*
** 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 tvfsShmSize(sqlite3_file*, int , int *);
static int tvfsShmGet(sqlite3_file*, int , int *, volatile void **);
static int tvfsShmRelease(sqlite3_file*);
static int tvfsShmLock(sqlite3_file*, int , int, int);
static void tvfsShmBarrier(sqlite3_file*);
static int tvfsShmClose(sqlite3_file*, int);
static sqlite3_io_methods tvfs_io_methods = {
2, /* 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 */
tvfsShmOpen, /* xShmOpen */
tvfsShmSize, /* xShmSize */
tvfsShmGet, /* xShmGet */
tvfsShmRelease, /* xShmRelease */
tvfsShmLock, /* xShmLock */
tvfsShmBarrier, /* xShmBarrier */
tvfsShmClose /* xShmClose */
};
/*
** Close an tvfs-file.
*/
static int tvfsClose(sqlite3_file *pFile){
TestvfsFile *p = (TestvfsFile *)pFile;
if( p->pShmId ){
Tcl_DecrRefCount(p->pShmId);
p->pShmId = 0;
}
if( pFile->pMethods ){
ckfree((char *)pFile->pMethods);
}
return sqlite3OsClose(p->pReal);
}
/*
** Read data from an tvfs-file.
*/
static int tvfsRead(
sqlite3_file *pFile,
void *zBuf,
int iAmt,
sqlite_int64 iOfst
){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsRead(p->pReal, zBuf, iAmt, iOfst);
}
/*
** Write data to an tvfs-file.
*/
static int tvfsWrite(
sqlite3_file *pFile,
const void *zBuf,
int iAmt,
sqlite_int64 iOfst
){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsWrite(p->pReal, zBuf, iAmt, iOfst);
}
/*
** Truncate an tvfs-file.
*/
static int tvfsTruncate(sqlite3_file *pFile, sqlite_int64 size){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsTruncate(p->pReal, size);
}
/*
** Sync an tvfs-file.
*/
static int tvfsSync(sqlite3_file *pFile, int flags){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsSync(p->pReal, flags);
}
/*
** Return the current file-size of an tvfs-file.
*/
static int tvfsFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsFileSize(p->pReal, pSize);
}
/*
** Lock an tvfs-file.
*/
static int tvfsLock(sqlite3_file *pFile, int eLock){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsLock(p->pReal, eLock);
}
/*
** Unlock an tvfs-file.
*/
static int tvfsUnlock(sqlite3_file *pFile, int eLock){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsUnlock(p->pReal, eLock);
}
/*
** Check if another file-handle holds a RESERVED lock on an tvfs-file.
*/
static int tvfsCheckReservedLock(sqlite3_file *pFile, int *pResOut){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsCheckReservedLock(p->pReal, pResOut);
}
/*
** File control method. For custom operations on an tvfs-file.
*/
static int tvfsFileControl(sqlite3_file *pFile, int op, void *pArg){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsFileControl(p->pReal, op, pArg);
}
/*
** Return the sector-size in bytes for an tvfs-file.
*/
static int tvfsSectorSize(sqlite3_file *pFile){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsSectorSize(p->pReal);
}
/*
** Return the device characteristic flags supported by an tvfs-file.
*/
static int tvfsDeviceCharacteristics(sqlite3_file *pFile){
TestvfsFile *p = (TestvfsFile *)pFile;
return sqlite3OsDeviceCharacteristics(p->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 *p = (TestvfsFile *)pFile;
p->pShm = 0;
p->pShmId = 0;
p->zFilename = zName;
p->pVfs = pVfs;
p->pReal = (sqlite3_file *)&p[1];
rc = sqlite3OsOpen(PARENTVFS(pVfs), zName, p->pReal, flags, pOutFlags);
if( p->pReal->pMethods ){
sqlite3_io_methods *pMethods;
pMethods = (sqlite3_io_methods *)ckalloc(sizeof(sqlite3_io_methods));
memcpy(pMethods, &tvfs_io_methods, sizeof(sqlite3_io_methods));
if( ((Testvfs *)pVfs->pAppData)->isNoshm ){
pMethods->xShmOpen = 0;
pMethods->xShmGet = 0;
pMethods->xShmSize = 0;
pMethods->xShmRelease = 0;
pMethods->xShmClose = 0;
pMethods->xShmLock = 0;
pMethods->xShmBarrier = 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){
return sqlite3OsDelete(PARENTVFS(pVfs), zPath, dirSync);
}
/*
** 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
){
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
){
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 void tvfsGrowBuffer(TestvfsFile *pFd, int reqSize, int *pNewSize){
TestvfsBuffer *pBuffer = pFd->pShm;
if( reqSize>pBuffer->n ){
pBuffer->a = (u8 *)ckrealloc((char *)pBuffer->a, reqSize);
memset(&pBuffer->a[pBuffer->n], 0x55, reqSize-pBuffer->n);
pBuffer->n = reqSize;
}
*pNewSize = pBuffer->n;
}
static void tvfsExecTcl(
Testvfs *p,
const char *zMethod,
Tcl_Obj *arg1,
Tcl_Obj *arg2,
Tcl_Obj *arg3
){
int rc; /* Return code from Tcl_EvalObj() */
int nArg; /* Elements in eval'd list */
p->apScript[p->nScript] = Tcl_NewStringObj(zMethod, -1);
p->apScript[p->nScript+1] = arg1;
p->apScript[p->nScript+2] = arg2;
p->apScript[p->nScript+3] = arg3;
for(nArg=p->nScript; p->apScript[nArg]; nArg++){
Tcl_IncrRefCount(p->apScript[nArg]);
}
rc = Tcl_EvalObjv(p->interp, nArg, p->apScript, TCL_EVAL_GLOBAL);
if( rc!=TCL_OK ){
Tcl_BackgroundError(p->interp);
Tcl_ResetResult(p->interp);
}
for(nArg=p->nScript; p->apScript[nArg]; nArg++){
Tcl_DecrRefCount(p->apScript[nArg]);
p->apScript[nArg] = 0;
}
}
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 tvfsShmOpen(
sqlite3_file *pFileDes
){
Testvfs *p;
int rc = SQLITE_OK; /* Return code */
Tcl_Obj *pId = 0; /* Id for this connection */
TestvfsBuffer *pBuffer; /* Buffer to open connection to */
TestvfsFile *pFd; /* The testvfs file structure */
pFd = (TestvfsFile*)pFileDes;
p = (Testvfs *)pFd->pVfs->pAppData;
assert( pFd->pShmId==0 && pFd->pShm==0 );
/* Evaluate the Tcl script:
**
** SCRIPT xShmOpen FILENAME
**
** 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.
*/
tvfsExecTcl(p, "xShmOpen", Tcl_NewStringObj(pFd->zFilename, -1), 0, 0);
if( tvfsResultCode(p, &rc) ){
if( rc!=SQLITE_OK ) return rc;
pId = Tcl_NewStringObj("anon", -1);
}else{
pId = Tcl_GetObjResult(p->interp);
}
Tcl_IncrRefCount(pId);
pFd->pShmId = pId;
/* 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 nByte = sizeof(TestvfsBuffer) + strlen(pFd->zFilename) + 1;
pBuffer = (TestvfsBuffer *)ckalloc(nByte);
memset(pBuffer, 0, nByte);
pBuffer->zFile = (char *)&pBuffer[1];
strcpy(pBuffer->zFile, pFd->zFilename);
pBuffer->pNext = p->pBuffer;
p->pBuffer = pBuffer;
}
/* Connect the TestvfsBuffer to the new TestvfsShm handle and return. */
pBuffer->nRef++;
pFd->pShm = pBuffer;
return SQLITE_OK;
}
static int tvfsShmSize(
sqlite3_file *pFile,
int reqSize,
int *pNewSize
){
int rc = SQLITE_OK;
TestvfsFile *pFd = (TestvfsFile *)pFile;
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
tvfsExecTcl(p, "xShmSize",
Tcl_NewStringObj(pFd->pShm->zFile, -1), pFd->pShmId, 0
);
tvfsResultCode(p, &rc);
if( rc==SQLITE_OK ){
tvfsGrowBuffer(pFd, reqSize, pNewSize);
}
return rc;
}
static int tvfsShmGet(
sqlite3_file *pFile,
int reqMapSize,
int *pMapSize,
volatile void **pp
){
int rc = SQLITE_OK;
TestvfsFile *pFd = (TestvfsFile *)pFile;
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
tvfsExecTcl(p, "xShmGet",
Tcl_NewStringObj(pFd->pShm->zFile, -1), pFd->pShmId, 0
);
tvfsResultCode(p, &rc);
if( rc==SQLITE_OK ){
tvfsGrowBuffer(pFd, reqMapSize, pMapSize);
*pp = pFd->pShm->a;
}
return rc;
}
static int tvfsShmRelease(sqlite3_file *pFile){
int rc = SQLITE_OK;
TestvfsFile *pFd = (TestvfsFile *)pFile;
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
tvfsExecTcl(p, "xShmRelease",
Tcl_NewStringObj(pFd->pShm->zFile, -1), pFd->pShmId, 0
);
tvfsResultCode(p, &rc);
return rc;
}
static int tvfsShmLock(
sqlite3_file *pFile,
int ofst,
int n,
int flags
){
int rc = SQLITE_OK;
TestvfsFile *pFd = (TestvfsFile *)pFile;
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
int nLock;
char zLock[80];
sqlite3_snprintf(sizeof(zLock), zLock, "%d %d", ofst, n);
nLock = strlen(zLock);
if( flags & SQLITE_SHM_LOCK ){
strcpy(&zLock[nLock], " lock");
}else{
strcpy(&zLock[nLock], " unlock");
}
nLock += 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)
);
tvfsResultCode(p, &rc);
return rc;
}
static void tvfsShmBarrier(sqlite3_file *pFile){
int rc = SQLITE_OK;
TestvfsFile *pFd = (TestvfsFile *)pFile;
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
tvfsExecTcl(p, "xShmBarrier",
Tcl_NewStringObj(pFd->pShm->zFile, -1), pFd->pShmId, 0
);
tvfsResultCode(p, &rc);
}
static int tvfsShmClose(
sqlite3_file *pFile,
int deleteFlag
){
int rc = SQLITE_OK;
TestvfsFile *pFd = (TestvfsFile *)pFile;
Testvfs *p = (Testvfs *)(pFd->pVfs->pAppData);
TestvfsBuffer *pBuffer = pFd->pShm;
assert( pFd->pShmId && pFd->pShm );
#if 0
assert( (deleteFlag!=0)==(pBuffer->nRef==1) );
#endif
tvfsExecTcl(p, "xShmClose",
Tcl_NewStringObj(pFd->pShm->zFile, -1), pFd->pShmId, 0
);
tvfsResultCode(p, &rc);
pBuffer->nRef--;
if( pBuffer->nRef==0 ){
TestvfsBuffer **pp;
for(pp=&p->pBuffer; *pp!=pBuffer; pp=&((*pp)->pNext));
*pp = (*pp)->pNext;
ckfree((char *)pBuffer->a);
ckfree((char *)pBuffer);
}
Tcl_DecrRefCount(pFd->pShmId);
pFd->pShmId = 0;
pFd->pShm = 0;
return rc;
}
static int testvfs_obj_cmd(
ClientData cd,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
Testvfs *p = (Testvfs *)cd;
static const char *CMD_strs[] = { "shm", "delete", 0 };
enum DB_enum { CMD_SHM, CMD_DELETE };
int i;
if( objc<2 ){
Tcl_WrongNumArgs(interp, 1, objv, "SUBCOMMAND ...");
return TCL_ERROR;
}
if( Tcl_GetIndexFromObj(interp, objv[1], CMD_strs, "subcommand", 0, &i) ){
return TCL_ERROR;
}
Tcl_ResetResult(interp);
switch( (enum DB_enum)i ){
case CMD_SHM: {
TestvfsBuffer *pBuffer;
char *zName;
if( objc!=3 && objc!=4 ){
Tcl_WrongNumArgs(interp, 2, objv, "FILE ?VALUE?");
return TCL_ERROR;
}
zName = Tcl_GetString(objv[2]);
for(pBuffer=p->pBuffer; pBuffer; pBuffer=pBuffer->pNext){
if( 0==strcmp(pBuffer->zFile, zName) ) break;
}
if( !pBuffer ){
Tcl_AppendResult(interp, "no such file: ", zName, 0);
return TCL_ERROR;
}
if( objc==4 ){
int n;
u8 *a = Tcl_GetByteArrayFromObj(objv[3], &n);
pBuffer->a = (u8 *)ckrealloc((char *)pBuffer->a, n);
pBuffer->n = n;
memcpy(pBuffer->a, a, n);
}
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(pBuffer->a, pBuffer->n));
break;
}
case CMD_DELETE: {
Tcl_DeleteCommand(interp, Tcl_GetString(objv[0]));
break;
}
}
return TCL_OK;
}
static void testvfs_obj_del(ClientData cd){
int i;
Testvfs *p = (Testvfs *)cd;
for(i=0; i<p->nScript; i++){
Tcl_DecrRefCount(p->apScript[i]);
}
sqlite3_vfs_unregister(p->pVfs);
ckfree((char *)p->pVfs);
ckfree((char *)p);
}
#define TESTVFS_MAX_ARGS 12
/*
** Usage: testvfs ?-noshm? VFSNAME SCRIPT
**
** 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 one of the xShmSize, xShmGet or xShmRelease methods of the VFS
** are invoked, the SCRIPT is executed as follows:
**
** SCRIPT xShmSize FILENAME ID
** SCRIPT xShmGet FILENAME ID
** SCRIPT xShmRelease 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 = {
2, /* iVersion */
sizeof(TestvfsFile), /* 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,
0,
};
Testvfs *p; /* New object */
sqlite3_vfs *pVfs; /* New VFS */
char *zVfs;
Tcl_Obj *pScript;
int nScript; /* Number of elements in list pScript */
Tcl_Obj **apScript; /* Array of pScript elements */
int nByte; /* Bytes of space to allocate at p */
int i; /* Counter variable */
int isNoshm = 0; /* True if -noshm is passed */
if( objc<3 ) goto bad_args;
if( strcmp(Tcl_GetString(objv[1]), "-noshm")==0 ){
isNoshm = 1;
}
if( objc!=3+isNoshm ) goto bad_args;
zVfs = Tcl_GetString(objv[isNoshm+1]);
pScript = objv[isNoshm+2];
if( TCL_OK!=Tcl_ListObjGetElements(interp, pScript, &nScript, &apScript) ){
return TCL_ERROR;
}
nByte = sizeof(Testvfs)
+ (nScript+TESTVFS_MAX_ARGS)*sizeof(Tcl_Obj *)
+ strlen(zVfs)+1;
p = (Testvfs *)ckalloc(nByte);
memset(p, 0, nByte);
p->pParent = sqlite3_vfs_find(0);
p->interp = interp;
p->nScript = nScript;
p->apScript = (Tcl_Obj **)&p[1];
for(i=0; i<nScript; i++){
p->apScript[i] = apScript[i];
Tcl_IncrRefCount(p->apScript[i]);
}
p->zName = (char *)&p->apScript[nScript+TESTVFS_MAX_ARGS];
strcpy(p->zName, zVfs);
pVfs = (sqlite3_vfs *)ckalloc(sizeof(sqlite3_vfs));
memcpy(pVfs, &tvfs_vfs, sizeof(sqlite3_vfs));
pVfs->pAppData = (void *)p;
pVfs->zName = p->zName;
pVfs->mxPathname = p->pParent->mxPathname;
pVfs->szOsFile += p->pParent->szOsFile;
p->pVfs = pVfs;
p->isNoshm = isNoshm;
Tcl_CreateObjCommand(interp, zVfs, testvfs_obj_cmd, p, testvfs_obj_del);
sqlite3_vfs_register(pVfs, 0);
return TCL_OK;
bad_args:
Tcl_WrongNumArgs(interp, 1, objv, "?-noshm? VFSNAME SCRIPT");
return TCL_ERROR;
}
int Sqlitetestvfs_Init(Tcl_Interp *interp){
Tcl_CreateObjCommand(interp, "testvfs", testvfs_cmd, 0, 0);
return TCL_OK;
}
#endif