/* Pass xWrite requests thru to the original VFS after
** determining the correct chunk to operate on.
** Break up writes across chunk boundaries.
*/
static int multiplexWrite(
sqlite3_file *pConn,
const void *pBuf,
int iAmt,
sqlite3_int64 iOfst
){
multiplexConn *p = (multiplexConn*)pConn;
multiplexGroup *pGroup = p->pGroup;
int rc = SQLITE_OK;
if( !pGroup->bEnabled ){
sqlite3_file *pSubOpen = multiplexSubOpen(pGroup, 0, &rc, NULL, 0);
if( pSubOpen==0 ){
rc = SQLITE_IOERR_WRITE;
}else{
rc = pSubOpen->pMethods->xWrite(pSubOpen, pBuf, iAmt, iOfst);
}
}else{
while( rc==SQLITE_OK && iAmt>0 ){
int i = (int)(iOfst / pGroup->szChunk);
sqlite3_file *pSubOpen = multiplexSubOpen(pGroup, i, &rc, NULL, 1);
if( pSubOpen ){
int extra = ((int)(iOfst % pGroup->szChunk) + iAmt) -
pGroup->szChunk;
if( extra<0 ) extra = 0;
iAmt -= extra;
rc = pSubOpen->pMethods->xWrite(pSubOpen, pBuf, iAmt,
iOfst % pGroup->szChunk);
pBuf = (char *)pBuf + iAmt;
iOfst += iAmt;
iAmt = extra;
}
}
}
return rc;
}
/* Pass xRead requests thru to the original VFS after
** determining the correct chunk to operate on.
** Break up reads across chunk boundaries.
*/
static int multiplexRead(
sqlite3_file *pConn,
void *pBuf,
int iAmt,
sqlite3_int64 iOfst
){
multiplexConn *p = (multiplexConn*)pConn;
multiplexGroup *pGroup = p->pGroup;
int rc = SQLITE_OK;
int nMutex = 0;
multiplexEnter(); nMutex++;
if( !pGroup->bEnabled ){
sqlite3_file *pSubOpen = multiplexSubOpen(pGroup, 0, &rc, NULL, 0);
multiplexLeave(); nMutex--;
if( pSubOpen==0 ){
rc = SQLITE_IOERR_READ;
}else{
rc = pSubOpen->pMethods->xRead(pSubOpen, pBuf, iAmt, iOfst);
}
}else{
while( iAmt > 0 ){
int i = (int)(iOfst / pGroup->szChunk);
sqlite3_file *pSubOpen;
if( nMutex==0 ){ multiplexEnter(); nMutex++; }
pSubOpen = multiplexSubOpen(pGroup, i, &rc, NULL, 1);
multiplexLeave(); nMutex--;
if( pSubOpen ){
int extra = ((int)(iOfst % pGroup->szChunk) + iAmt) - pGroup->szChunk;
if( extra<0 ) extra = 0;
iAmt -= extra;
rc = pSubOpen->pMethods->xRead(pSubOpen, pBuf, iAmt,
iOfst % pGroup->szChunk);
if( rc!=SQLITE_OK ) break;
pBuf = (char *)pBuf + iAmt;
iOfst += iAmt;
iAmt = extra;
}else{
rc = SQLITE_IOERR_READ;
break;
}
}
}
assert( nMutex==0 || nMutex==1 );
if( nMutex ) multiplexLeave();
return rc;
}
/* Pass xShmBarrier requests through to the original VFS unchanged.
*/
static void multiplexShmBarrier(sqlite3_file *pConn){
multiplexConn *p = (multiplexConn*)pConn;
int rc;
sqlite3_file *pSubOpen = multiplexSubOpen(p->pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
pSubOpen->pMethods->xShmBarrier(pSubOpen);
}
}
/* Pass xDeviceCharacteristics requests through to the original VFS unchanged.
*/
static int multiplexDeviceCharacteristics(sqlite3_file *pConn){
multiplexConn *p = (multiplexConn*)pConn;
int rc;
sqlite3_file *pSubOpen = multiplexSubOpen(p->pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
return pSubOpen->pMethods->xDeviceCharacteristics(pSubOpen);
}
return 0;
}
/* Pass xSectorSize requests through to the original VFS unchanged.
*/
static int multiplexSectorSize(sqlite3_file *pConn){
multiplexConn *p = (multiplexConn*)pConn;
int rc;
sqlite3_file *pSubOpen = multiplexSubOpen(p->pGroup, 0, &rc, NULL, 0);
if( pSubOpen && pSubOpen->pMethods->xSectorSize ){
return pSubOpen->pMethods->xSectorSize(pSubOpen);
}
return DEFAULT_SECTOR_SIZE;
}
/* Pass xShmUnmap requests through to the original VFS unchanged.
*/
static int multiplexShmUnmap(sqlite3_file *pConn, int deleteFlag){
multiplexConn *p = (multiplexConn*)pConn;
int rc;
sqlite3_file *pSubOpen = multiplexSubOpen(p->pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
return pSubOpen->pMethods->xShmUnmap(pSubOpen, deleteFlag);
}
return SQLITE_OK;
}
/* Pass xCheckReservedLock requests through to the original VFS unchanged.
*/
static int multiplexCheckReservedLock(sqlite3_file *pConn, int *pResOut){
multiplexConn *p = (multiplexConn*)pConn;
int rc;
sqlite3_file *pSubOpen = multiplexSubOpen(p->pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
return pSubOpen->pMethods->xCheckReservedLock(pSubOpen, pResOut);
}
return SQLITE_IOERR_CHECKRESERVEDLOCK;
}
/* Pass xUnlock requests through to the original VFS unchanged.
*/
static int multiplexUnlock(sqlite3_file *pConn, int lock){
multiplexConn *p = (multiplexConn*)pConn;
int rc;
sqlite3_file *pSubOpen = multiplexSubOpen(p->pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
return pSubOpen->pMethods->xUnlock(pSubOpen, lock);
}
return SQLITE_IOERR_UNLOCK;
}
/* Pass xTruncate requests thru to the original VFS after
** determining the correct chunk to operate on. Delete any
** chunks above the truncate mark.
*/
static int multiplexTruncate(sqlite3_file *pConn, sqlite3_int64 size){
multiplexConn *p = (multiplexConn*)pConn;
multiplexGroup *pGroup = p->pGroup;
int rc = SQLITE_OK;
multiplexEnter();
if( !pGroup->bEnabled ){
sqlite3_file *pSubOpen = multiplexSubOpen(pGroup, 0, &rc, NULL, 0);
if( pSubOpen==0 ){
rc = SQLITE_IOERR_TRUNCATE;
}else{
rc = pSubOpen->pMethods->xTruncate(pSubOpen, size);
}
}else{
int i;
int iBaseGroup = (int)(size / pGroup->szChunk);
sqlite3_file *pSubOpen;
sqlite3_vfs *pOrigVfs = gMultiplex.pOrigVfs; /* Real VFS */
/* delete the chunks above the truncate limit */
for(i = pGroup->nReal-1; i>iBaseGroup && rc==SQLITE_OK; i--){
if( pGroup->bTruncate ){
multiplexSubClose(pGroup, i, pOrigVfs);
}else{
pSubOpen = multiplexSubOpen(pGroup, i, &rc, 0, 0);
if( pSubOpen ){
rc = pSubOpen->pMethods->xTruncate(pSubOpen, 0);
}
}
}
if( rc==SQLITE_OK ){
pSubOpen = multiplexSubOpen(pGroup, iBaseGroup, &rc, 0, 0);
if( pSubOpen ){
rc = pSubOpen->pMethods->xTruncate(pSubOpen, size % pGroup->szChunk);
}
}
if( rc ) rc = SQLITE_IOERR_TRUNCATE;
}
multiplexLeave();
return rc;
}
/*
** Return the size, in bytes, of chunk number iChunk. If that chunk
** does not exist, then return 0. This function does not distingish between
** non-existant files and zero-length files.
*/
static sqlite3_int64 multiplexSubSize(
multiplexGroup *pGroup, /* The multiplexor group */
int iChunk, /* Which chunk to open. 0==original file */
int *rc /* Result code in and out */
){
sqlite3_file *pSub;
sqlite3_int64 sz = 0;
if( *rc ) return 0;
pSub = multiplexSubOpen(pGroup, iChunk, rc, NULL, 0);
if( pSub==0 ) return 0;
*rc = pSub->pMethods->xFileSize(pSub, &sz);
return sz;
}
/* Pass xShmLock requests through to the original VFS unchanged.
*/
static int multiplexShmLock(
sqlite3_file *pConn, /* 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 */
){
multiplexConn *p = (multiplexConn*)pConn;
int rc;
sqlite3_file *pSubOpen = multiplexSubOpen(p->pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
return pSubOpen->pMethods->xShmLock(pSubOpen, ofst, n, flags);
}
return SQLITE_BUSY;
}
/* Pass xFileControl requests through to the original VFS unchanged,
** except for any MULTIPLEX_CTRL_* requests here.
*/
static int multiplexFileControl(sqlite3_file *pConn, int op, void *pArg){
multiplexConn *p = (multiplexConn*)pConn;
multiplexGroup *pGroup = p->pGroup;
int rc = SQLITE_ERROR;
sqlite3_file *pSubOpen;
if( !gMultiplex.isInitialized ) return SQLITE_MISUSE;
switch( op ){
case MULTIPLEX_CTRL_ENABLE:
if( pArg ) {
int bEnabled = *(int *)pArg;
pGroup->bEnabled = bEnabled;
rc = SQLITE_OK;
}
break;
case MULTIPLEX_CTRL_SET_CHUNK_SIZE:
if( pArg ) {
unsigned int szChunk = *(unsigned*)pArg;
if( szChunk<1 ){
rc = SQLITE_MISUSE;
}else{
/* Round up to nearest multiple of MAX_PAGE_SIZE. */
szChunk = (szChunk + (MAX_PAGE_SIZE-1));
szChunk &= ~(MAX_PAGE_SIZE-1);
pGroup->szChunk = szChunk;
rc = SQLITE_OK;
}
}
break;
case MULTIPLEX_CTRL_SET_MAX_CHUNKS:
rc = SQLITE_OK;
break;
case SQLITE_FCNTL_SIZE_HINT:
case SQLITE_FCNTL_CHUNK_SIZE:
/* no-op these */
rc = SQLITE_OK;
break;
default:
pSubOpen = multiplexSubOpen(pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
rc = pSubOpen->pMethods->xFileControl(pSubOpen, op, pArg);
if( op==SQLITE_FCNTL_VFSNAME && rc==SQLITE_OK ){
*(char**)pArg = sqlite3_mprintf("multiplex/%z", *(char**)pArg);
}
}
break;
}
return rc;
}
/* Pass xShmMap requests through to the original VFS unchanged.
*/
static int multiplexShmMap(
sqlite3_file *pConn, /* Handle open on database file */
int iRegion, /* Region to retrieve */
int szRegion, /* Size of regions */
int bExtend, /* True to extend file if necessary */
void volatile **pp /* OUT: Mapped memory */
){
multiplexConn *p = (multiplexConn*)pConn;
int rc;
sqlite3_file *pSubOpen = multiplexSubOpen(p->pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
return pSubOpen->pMethods->xShmMap(pSubOpen, iRegion, szRegion, bExtend,pp);
}
return SQLITE_IOERR;
}
/* Pass xFileSize requests through to the original VFS.
** Aggregate the size of all the chunks before returning.
*/
static int multiplexFileSize(sqlite3_file *pConn, sqlite3_int64 *pSize){
multiplexConn *p = (multiplexConn*)pConn;
multiplexGroup *pGroup = p->pGroup;
int rc = SQLITE_OK;
int i;
multiplexEnter();
if( !pGroup->bEnabled ){
sqlite3_file *pSubOpen = multiplexSubOpen(pGroup, 0, &rc, NULL, 0);
if( pSubOpen==0 ){
rc = SQLITE_IOERR_FSTAT;
}else{
rc = pSubOpen->pMethods->xFileSize(pSubOpen, pSize);
}
}else{
*pSize = 0;
for(i=0; rc==SQLITE_OK; i++){
sqlite3_int64 sz = multiplexSubSize(pGroup, i, &rc);
if( sz==0 ) break;
*pSize = i*(sqlite3_int64)pGroup->szChunk + sz;
}
}
multiplexLeave();
return rc;
}
/* Pass xFileControl requests through to the original VFS unchanged,
** except for any MULTIPLEX_CTRL_* requests here.
*/
static int multiplexFileControl(sqlite3_file *pConn, int op, void *pArg){
multiplexConn *p = (multiplexConn*)pConn;
multiplexGroup *pGroup = p->pGroup;
int rc = SQLITE_ERROR;
sqlite3_file *pSubOpen;
if( !gMultiplex.isInitialized ) return SQLITE_MISUSE;
switch( op ){
case MULTIPLEX_CTRL_ENABLE:
if( pArg ) {
int bEnabled = *(int *)pArg;
pGroup->bEnabled = bEnabled;
rc = SQLITE_OK;
}
break;
case MULTIPLEX_CTRL_SET_CHUNK_SIZE:
if( pArg ) {
unsigned int szChunk = *(unsigned*)pArg;
if( szChunk<1 ){
rc = SQLITE_MISUSE;
}else{
/* Round up to nearest multiple of MAX_PAGE_SIZE. */
szChunk = (szChunk + (MAX_PAGE_SIZE-1));
szChunk &= ~(MAX_PAGE_SIZE-1);
pGroup->szChunk = szChunk;
rc = SQLITE_OK;
}
}
break;
case MULTIPLEX_CTRL_SET_MAX_CHUNKS:
rc = SQLITE_OK;
break;
case SQLITE_FCNTL_SIZE_HINT:
case SQLITE_FCNTL_CHUNK_SIZE:
/* no-op these */
rc = SQLITE_OK;
break;
case SQLITE_FCNTL_PRAGMA: {
char **aFcntl = (char**)pArg;
/*
** EVIDENCE-OF: R-29875-31678 The argument to the SQLITE_FCNTL_PRAGMA
** file control is an array of pointers to strings (char**) in which the
** second element of the array is the name of the pragma and the third
** element is the argument to the pragma or NULL if the pragma has no
** argument.
*/
if( aFcntl[1] && sqlite3_stricmp(aFcntl[1],"multiplex_truncate")==0 ){
if( aFcntl[2] && aFcntl[2][0] ){
if( sqlite3_stricmp(aFcntl[2], "on")==0
|| sqlite3_stricmp(aFcntl[2], "1")==0 ){
pGroup->bTruncate = 1;
}else
if( sqlite3_stricmp(aFcntl[2], "off")==0
|| sqlite3_stricmp(aFcntl[2], "0")==0 ){
pGroup->bTruncate = 0;
}
}
/* EVIDENCE-OF: R-27806-26076 The handler for an SQLITE_FCNTL_PRAGMA
** file control can optionally make the first element of the char**
** argument point to a string obtained from sqlite3_mprintf() or the
** equivalent and that string will become the result of the pragma
** or the error message if the pragma fails.
*/
aFcntl[0] = sqlite3_mprintf(pGroup->bTruncate ? "on" : "off");
rc = SQLITE_OK;
break;
}
/* If the multiplexor does not handle the pragma, pass it through
** into the default case. */
}
default:
pSubOpen = multiplexSubOpen(pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
rc = pSubOpen->pMethods->xFileControl(pSubOpen, op, pArg);
if( op==SQLITE_FCNTL_VFSNAME && rc==SQLITE_OK ){
*(char**)pArg = sqlite3_mprintf("multiplex/%z", *(char**)pArg);
}
}
break;
}
return rc;
}
/*
** This is the xOpen method used for the "multiplex" VFS.
**
** Most of the work is done by the underlying original VFS. This method
** simply links the new file into the appropriate multiplex group if it is a
** file that needs to be tracked.
*/
static int multiplexOpen(
sqlite3_vfs *pVfs, /* The multiplex VFS */
const char *zName, /* Name of file to be opened */
sqlite3_file *pConn, /* Fill in this file descriptor */
int flags, /* Flags to control the opening */
int *pOutFlags /* Flags showing results of opening */
){
int rc = SQLITE_OK; /* Result code */
multiplexConn *pMultiplexOpen; /* The new multiplex file descriptor */
multiplexGroup *pGroup = 0; /* Corresponding multiplexGroup object */
sqlite3_file *pSubOpen = 0; /* Real file descriptor */
sqlite3_vfs *pOrigVfs = gMultiplex.pOrigVfs; /* Real VFS */
int nName = 0;
int sz = 0;
char *zToFree = 0;
UNUSED_PARAMETER(pVfs);
memset(pConn, 0, pVfs->szOsFile);
assert( zName || (flags & SQLITE_OPEN_DELETEONCLOSE) );
/* We need to create a group structure and manage
** access to this group of files.
*/
multiplexEnter();
pMultiplexOpen = (multiplexConn*)pConn;
if( rc==SQLITE_OK ){
/* allocate space for group */
nName = zName ? multiplexStrlen30(zName) : 0;
sz = sizeof(multiplexGroup) /* multiplexGroup */
+ nName + 1; /* zName */
pGroup = sqlite3_malloc64( sz );
if( pGroup==0 ){
rc = SQLITE_NOMEM;
}
}
if( rc==SQLITE_OK ){
const char *zUri = (flags & SQLITE_OPEN_URI) ? zName : 0;
/* assign pointers to extra space allocated */
memset(pGroup, 0, sz);
pMultiplexOpen->pGroup = pGroup;
pGroup->bEnabled = (unsigned char)-1;
pGroup->bTruncate = sqlite3_uri_boolean(zUri, "truncate",
(flags & SQLITE_OPEN_MAIN_DB)==0);
pGroup->szChunk = (int)sqlite3_uri_int64(zUri, "chunksize",
SQLITE_MULTIPLEX_CHUNK_SIZE);
pGroup->szChunk = (pGroup->szChunk+0xffff)&~0xffff;
if( zName ){
char *p = (char *)&pGroup[1];
pGroup->zName = p;
memcpy(pGroup->zName, zName, nName+1);
pGroup->nName = nName;
}
if( pGroup->bEnabled ){
/* Make sure that the chunksize is such that the pending byte does not
** falls at the end of a chunk. A region of up to 64K following
** the pending byte is never written, so if the pending byte occurs
** near the end of a chunk, that chunk will be too small. */
#ifndef SQLITE_OMIT_WSD
extern int sqlite3PendingByte;
#else
int sqlite3PendingByte = 0x40000000;
#endif
while( (sqlite3PendingByte % pGroup->szChunk)>=(pGroup->szChunk-65536) ){
pGroup->szChunk += 65536;
}
}
pGroup->flags = flags;
rc = multiplexSubFilename(pGroup, 1);
if( rc==SQLITE_OK ){
pSubOpen = multiplexSubOpen(pGroup, 0, &rc, pOutFlags, 0);
if( pSubOpen==0 && rc==SQLITE_OK ) rc = SQLITE_CANTOPEN;
}
if( rc==SQLITE_OK ){
sqlite3_int64 sz64;
rc = pSubOpen->pMethods->xFileSize(pSubOpen, &sz64);
if( rc==SQLITE_OK && zName ){
int bExists;
if( flags & SQLITE_OPEN_MASTER_JOURNAL ){
pGroup->bEnabled = 0;
}else
if( sz64==0 ){
if( flags & SQLITE_OPEN_MAIN_JOURNAL ){
/* If opening a main journal file and the first chunk is zero
** bytes in size, delete any subsequent chunks from the
** file-system. */
int iChunk = 1;
do {
rc = pOrigVfs->xAccess(pOrigVfs,
pGroup->aReal[iChunk].z, SQLITE_ACCESS_EXISTS, &bExists
);
if( rc==SQLITE_OK && bExists ){
rc = pOrigVfs->xDelete(pOrigVfs, pGroup->aReal[iChunk].z, 0);
if( rc==SQLITE_OK ){
rc = multiplexSubFilename(pGroup, ++iChunk);
}
}
}while( rc==SQLITE_OK && bExists );
}
}else{
/* If the first overflow file exists and if the size of the main file
** is different from the chunk size, that means the chunk size is set
** set incorrectly. So fix it.
**
** Or, if the first overflow file does not exist and the main file is
** larger than the chunk size, that means the chunk size is too small.
** But we have no way of determining the intended chunk size, so
** just disable the multiplexor all togethre.
*/
rc = pOrigVfs->xAccess(pOrigVfs, pGroup->aReal[1].z,
SQLITE_ACCESS_EXISTS, &bExists);
bExists = multiplexSubSize(pGroup, 1, &rc)>0;
if( rc==SQLITE_OK && bExists && sz64==(sz64&0xffff0000) && sz64>0
&& sz64!=pGroup->szChunk ){
pGroup->szChunk = (int)sz64;
}else if( rc==SQLITE_OK && !bExists && sz64>pGroup->szChunk ){
pGroup->bEnabled = 0;
}
}
}
}
if( rc==SQLITE_OK ){
if( pSubOpen->pMethods->iVersion==1 ){
pMultiplexOpen->base.pMethods = &gMultiplex.sIoMethodsV1;
}else{
pMultiplexOpen->base.pMethods = &gMultiplex.sIoMethodsV2;
}
/* place this group at the head of our list */
pGroup->pNext = gMultiplex.pGroups;
if( gMultiplex.pGroups ) gMultiplex.pGroups->pPrev = pGroup;
gMultiplex.pGroups = pGroup;
}else{
multiplexFreeComponents(pGroup);
sqlite3_free(pGroup);
}
}
multiplexLeave();
sqlite3_free(zToFree);
return rc;
}
/* Pass xFileControl requests through to the original VFS unchanged,
** except for any MULTIPLEX_CTRL_* requests here.
*/
static int multiplexFileControl(sqlite3_file *pConn, int op, void *pArg){
multiplexConn *p = (multiplexConn*)pConn;
multiplexGroup *pGroup = p->pGroup;
int rc = SQLITE_ERROR;
sqlite3_file *pSubOpen;
if( !gMultiplex.isInitialized ) return SQLITE_MISUSE;
switch( op ){
case MULTIPLEX_CTRL_ENABLE:
if( pArg ) {
int bEnabled = *(int *)pArg;
pGroup->bEnabled = bEnabled;
rc = SQLITE_OK;
}
break;
case MULTIPLEX_CTRL_SET_CHUNK_SIZE:
if( pArg ) {
unsigned int szChunk = *(unsigned*)pArg;
if( szChunk<1 ){
rc = SQLITE_MISUSE;
}else{
/* Round up to nearest multiple of MAX_PAGE_SIZE. */
szChunk = (szChunk + (MAX_PAGE_SIZE-1));
szChunk &= ~(MAX_PAGE_SIZE-1);
pGroup->szChunk = szChunk;
rc = SQLITE_OK;
}
}
break;
case MULTIPLEX_CTRL_SET_MAX_CHUNKS:
rc = SQLITE_OK;
break;
case SQLITE_FCNTL_SIZE_HINT:
case SQLITE_FCNTL_CHUNK_SIZE:
/* no-op these */
rc = SQLITE_OK;
break;
case SQLITE_FCNTL_PRAGMA: {
char **aFcntl = (char**)pArg;
if( aFcntl[1] && sqlite3_stricmp(aFcntl[1],"multiplex_truncate")==0 ){
if( aFcntl[2] && aFcntl[2][0] ){
if( sqlite3_stricmp(aFcntl[2], "on")==0
|| sqlite3_stricmp(aFcntl[2], "1")==0 ){
pGroup->bTruncate = 1;
}else
if( sqlite3_stricmp(aFcntl[2], "off")==0
|| sqlite3_stricmp(aFcntl[2], "0")==0 ){
pGroup->bTruncate = 0;
}
}
aFcntl[0] = sqlite3_mprintf(pGroup->bTruncate ? "on" : "off");
rc = SQLITE_OK;
break;
}
/* If the multiplexor does not handle the pragma, pass it through
** into the default case. */
}
default:
pSubOpen = multiplexSubOpen(pGroup, 0, &rc, NULL, 0);
if( pSubOpen ){
rc = pSubOpen->pMethods->xFileControl(pSubOpen, op, pArg);
if( op==SQLITE_FCNTL_VFSNAME && rc==SQLITE_OK ){
*(char**)pArg = sqlite3_mprintf("multiplex/%z", *(char**)pArg);
}
}
break;
}
return rc;
}