[sqlite] Remove obsolete reference version 3.8.7.4.

third_party/sqlite/sqlite-src-3080704/ext/misc/vfslog.c

Index: third_party/sqlite/sqlite-src-3080704/ext/misc/vfslog.c
diff --git a/third_party/sqlite/sqlite-src-3080704/ext/misc/vfslog.c b/third_party/sqlite/sqlite-src-3080704/ext/misc/vfslog.c
deleted file mode 100644
index b55b06fcf3a7429bd9e78efbb5ec3d9f3b3de892..0000000000000000000000000000000000000000
--- a/third_party/sqlite/sqlite-src-3080704/ext/misc/vfslog.c
+++ /dev/null
@@ -1,759 +0,0 @@
-/*
-** 2013-10-09
-**
-** 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 an SQLite vfs wrapper for
-** unix that generates per-database log files of all disk activity.
-*/
-
-/*
-** This module contains code for a wrapper VFS that causes a log of
-** most VFS calls to be written into a file on disk.
-**
-** Each database connection creates a separate log file in the same
-** directory as the original database and named after the original
-** database.  A unique suffix is added to avoid name collisions.  
-** Separate log files are used so that concurrent processes do not
-** try to write log operations to the same file at the same instant, 
-** resulting in overwritten or comingled log text.
-**
-** Each individual log file records operations by a single database
-** connection on both the original database and its associated rollback
-** journal.
-**
-** The log files are in the comma-separated-value (CSV) format.  The
-** log files can be imported into an SQLite database using the ".import"
-** command of the SQLite command-line shell for analysis.
-**
-** One technique for using this module is to append the text of this
-** module to the end of a standard "sqlite3.c" amalgamation file then
-** add the following compile-time options:
-**
-**     -DSQLITE_EXTRA_INIT=sqlite3_register_vfslog
-**     -DSQLITE_USE_FCNTL_TRACE
-**
-** The first compile-time option causes the sqlite3_register_vfslog()
-** function, defined below, to be invoked when SQLite is initialized.
-** That causes this custom VFS to become the default VFS for all
-** subsequent connections.  The SQLITE_USE_FCNTL_TRACE option causes
-** the SQLite core to issue extra sqlite3_file_control() operations
-** with SQLITE_FCNTL_TRACE to give some indication of what is going
-** on in the core.
-*/
-
-#include "sqlite3.h"
-#include <string.h>
-#include <assert.h>
-#include <stdio.h>
-#if SQLITE_OS_UNIX
-# include <unistd.h>
-#endif
-
-/*
-** Forward declaration of objects used by this utility
-*/
-typedef struct VLogLog VLogLog;
-typedef struct VLogVfs VLogVfs;
-typedef struct VLogFile VLogFile;
-
-/* There is a pair (an array of size 2) of the following objects for
-** each database file being logged.  The first contains the filename
-** and is used to log I/O with the main database.  The second has
-** a NULL filename and is used to log I/O for the journal.  Both
-** out pointers are the same.
-*/
-struct VLogLog {
-  VLogLog *pNext;                 /* Next in a list of all active logs */
-  VLogLog **ppPrev;               /* Pointer to this in the list */
-  int nRef;                       /* Number of references to this object */
-  int nFilename;                  /* Length of zFilename in bytes */
-  char *zFilename;                /* Name of database file.  NULL for journal */
-  FILE *out;                      /* Write information here */
-};
-
-struct VLogVfs {
-  sqlite3_vfs base;               /* VFS methods */
-  sqlite3_vfs *pVfs;              /* Parent VFS */
-};
-
-struct VLogFile {
-  sqlite3_file base;              /* IO methods */
-  sqlite3_file *pReal;            /* Underlying file handle */
-  VLogLog *pLog;                  /* The log file for this file */
-};
-
-#define REALVFS(p) (((VLogVfs*)(p))->pVfs)
-
-/*
-** Methods for VLogFile
-*/
-static int vlogClose(sqlite3_file*);
-static int vlogRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
-static int vlogWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst);
-static int vlogTruncate(sqlite3_file*, sqlite3_int64 size);
-static int vlogSync(sqlite3_file*, int flags);
-static int vlogFileSize(sqlite3_file*, sqlite3_int64 *pSize);
-static int vlogLock(sqlite3_file*, int);
-static int vlogUnlock(sqlite3_file*, int);
-static int vlogCheckReservedLock(sqlite3_file*, int *pResOut);
-static int vlogFileControl(sqlite3_file*, int op, void *pArg);
-static int vlogSectorSize(sqlite3_file*);
-static int vlogDeviceCharacteristics(sqlite3_file*);
-
-/*
-** Methods for VLogVfs
-*/
-static int vlogOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *);
-static int vlogDelete(sqlite3_vfs*, const char *zName, int syncDir);
-static int vlogAccess(sqlite3_vfs*, const char *zName, int flags, int *);
-static int vlogFullPathname(sqlite3_vfs*, const char *zName, int, char *zOut);
-static void *vlogDlOpen(sqlite3_vfs*, const char *zFilename);
-static void vlogDlError(sqlite3_vfs*, int nByte, char *zErrMsg);
-static void (*vlogDlSym(sqlite3_vfs *pVfs, void *p, const char*zSym))(void);
-static void vlogDlClose(sqlite3_vfs*, void*);
-static int vlogRandomness(sqlite3_vfs*, int nByte, char *zOut);
-static int vlogSleep(sqlite3_vfs*, int microseconds);
-static int vlogCurrentTime(sqlite3_vfs*, double*);
-static int vlogGetLastError(sqlite3_vfs*, int, char *);
-static int vlogCurrentTimeInt64(sqlite3_vfs*, sqlite3_int64*);
-
-static VLogVfs vlog_vfs = {
-  {
-    1,                            /* iVersion */
-    0,                            /* szOsFile (set by register_vlog()) */
-    1024,                         /* mxPathname */
-    0,                            /* pNext */
-    "vfslog",                     /* zName */
-    0,                            /* pAppData */
-    vlogOpen,                     /* xOpen */
-    vlogDelete,                   /* xDelete */
-    vlogAccess,                   /* xAccess */
-    vlogFullPathname,             /* xFullPathname */
-    vlogDlOpen,                   /* xDlOpen */
-    vlogDlError,                  /* xDlError */
-    vlogDlSym,                    /* xDlSym */
-    vlogDlClose,                  /* xDlClose */
-    vlogRandomness,               /* xRandomness */
-    vlogSleep,                    /* xSleep */
-    vlogCurrentTime,              /* xCurrentTime */
-    vlogGetLastError,             /* xGetLastError */
-    vlogCurrentTimeInt64          /* xCurrentTimeInt64 */
-  },
-  0
-};
-
-static sqlite3_io_methods vlog_io_methods = {
-  1,                              /* iVersion */
-  vlogClose,                      /* xClose */
-  vlogRead,                       /* xRead */
-  vlogWrite,                      /* xWrite */
-  vlogTruncate,                   /* xTruncate */
-  vlogSync,                       /* xSync */
-  vlogFileSize,                   /* xFileSize */
-  vlogLock,                       /* xLock */
-  vlogUnlock,                     /* xUnlock */
-  vlogCheckReservedLock,          /* xCheckReservedLock */
-  vlogFileControl,                /* xFileControl */
-  vlogSectorSize,                 /* xSectorSize */
-  vlogDeviceCharacteristics,      /* xDeviceCharacteristics */
-  0,                              /* xShmMap */
-  0,                              /* xShmLock */
-  0,                              /* xShmBarrier */
-  0                               /* xShmUnmap */
-};
-
-#if SQLITE_OS_UNIX && !defined(NO_GETTOD)
-#include <sys/time.h>
-static sqlite3_uint64 vlog_time(){
-  struct timeval sTime;
-  gettimeofday(&sTime, 0);
-  return sTime.tv_usec + (sqlite3_uint64)sTime.tv_sec * 1000000;
-}
-#elif SQLITE_OS_WIN
-#include <windows.h>
-#include <time.h>
-static sqlite3_uint64 vlog_time(){
-  FILETIME ft;
-  sqlite3_uint64 u64time = 0;
- 
-  GetSystemTimeAsFileTime(&ft);
-
-  u64time |= ft.dwHighDateTime;
-  u64time <<= 32;
-  u64time |= ft.dwLowDateTime;
-
-  /* ft is 100-nanosecond intervals, we want microseconds */
-  return u64time /(sqlite3_uint64)10;
-}
-#else
-static sqlite3_uint64 vlog_time(){
-  return 0;
-}
-#endif
-
-
-/*
-** Write a message to the log file
-*/
-static void vlogLogPrint(
-  VLogLog *pLog,                 /* The log file to write into */
-  sqlite3_int64 tStart,            /* Start time of system call */
-  sqlite3_int64 tElapse,           /* Elapse time of system call */
-  const char *zOp,                 /* Type of system call */
-  sqlite3_int64 iArg1,             /* First argument */
-  sqlite3_int64 iArg2,             /* Second argument */
-  const char *zArg3,               /* Third argument */
-  int iRes                         /* Result */
-){
-  char z1[40], z2[40], z3[2000];
-  if( pLog==0 ) return;
-  if( iArg1>=0 ){
-    sqlite3_snprintf(sizeof(z1), z1, "%lld", iArg1);
-  }else{
-    z1[0] = 0;
-  }
-  if( iArg2>=0 ){
-    sqlite3_snprintf(sizeof(z2), z2, "%lld", iArg2);
-  }else{
-    z2[0] = 0;
-  }
-  if( zArg3 ){
-    sqlite3_snprintf(sizeof(z3), z3, "\"%.*w\"", sizeof(z3)-4, zArg3);
-  }else{
-    z3[0] = 0;
-  }
-  fprintf(pLog->out,"%lld,%lld,%s,%d,%s,%s,%s,%d\n",
-      tStart, tElapse, zOp, pLog->zFilename==0, z1, z2, z3, iRes);
-}
-
-/*
-** List of all active log connections.  Protected by the master mutex.
-*/
-static VLogLog *allLogs = 0;
-
-/*
-** Close a VLogLog object
-*/
-static void vlogLogClose(VLogLog *p){
-  if( p ){
-    sqlite3_mutex *pMutex;
-    p->nRef--;
-    if( p->nRef>0 || p->zFilename==0 ) return;
-    pMutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MASTER);
-    sqlite3_mutex_enter(pMutex);
-    *p->ppPrev = p->pNext;
-    if( p->pNext ) p->pNext->ppPrev = p->ppPrev;
-    sqlite3_mutex_leave(pMutex);
-    fclose(p->out);
-    sqlite3_free(p);
-  }
-}
-
-/*
-** Open a VLogLog object on the given file
-*/
-static VLogLog *vlogLogOpen(const char *zFilename){
-  int nName = (int)strlen(zFilename);
-  int isJournal = 0;
-  sqlite3_mutex *pMutex;
-  VLogLog *pLog, *pTemp;
-  sqlite3_int64 tNow = 0;
-  if( nName>4 && strcmp(zFilename+nName-4,"-wal")==0 ){
-    return 0;  /* Do not log wal files */
-  }else
-  if( nName>8 && strcmp(zFilename+nName-8,"-journal")==0 ){
-    nName -= 8;
-    isJournal = 1;
-  }else if( nName>12 
-         && sqlite3_strglob("-mj??????9??", zFilename+nName-12)==0 ){
-    return 0;  /* Do not log master journal files */
-  }
-  pTemp = sqlite3_malloc( sizeof(*pLog)*2 + nName + 60 );
-  if( pTemp==0 ) return 0;
-  pMutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MASTER);
-  sqlite3_mutex_enter(pMutex);
-  for(pLog=allLogs; pLog; pLog=pLog->pNext){
-    if( pLog->nFilename==nName && !memcmp(pLog->zFilename, zFilename, nName) ){
-      break;
-    }
-  }
-  if( pLog==0 ){
-    pLog = pTemp;
-    pTemp = 0;
-    memset(pLog, 0, sizeof(*pLog)*2);
-    pLog->zFilename = (char*)&pLog[2];
-    tNow = vlog_time();
-    sqlite3_snprintf(nName+60, pLog->zFilename, "%.*s-debuglog-%lld",
-                     nName, zFilename, tNow);
-    pLog->out = fopen(pLog->zFilename, "a");
-    if( pLog->out==0 ){
-      sqlite3_mutex_leave(pMutex);
-      sqlite3_free(pLog);
-      return 0;
-    }
-    pLog->nFilename = nName;
-    pLog[1].out = pLog[0].out;
-    pLog->ppPrev = &allLogs;
-    if( allLogs ) allLogs->ppPrev = &pLog->pNext;
-    pLog->pNext = allLogs;
-    allLogs = pLog;
-  }
-  sqlite3_mutex_leave(pMutex);
-  if( pTemp ){
-    sqlite3_free(pTemp);
-  }else{
-#if SQLITE_OS_UNIX
-    char zHost[200];
-    zHost[0] = 0;
-    gethostname(zHost, sizeof(zHost)-1);
-    zHost[sizeof(zHost)-1] = 0;
-    vlogLogPrint(pLog, tNow, 0, "IDENT", getpid(), -1, zHost, 0);
-#endif
-  }
-  if( pLog && isJournal ) pLog++;
-  pLog->nRef++;
-  return pLog;
-}
-
-
-/*
-** Close an vlog-file.
-*/
-static int vlogClose(sqlite3_file *pFile){
-  sqlite3_uint64 tStart, tElapse;
-  int rc = SQLITE_OK;
-  VLogFile *p = (VLogFile *)pFile;
-
-  tStart = vlog_time();
-  if( p->pReal->pMethods ){
-    rc = p->pReal->pMethods->xClose(p->pReal);
-  }
-  tElapse = vlog_time() - tStart;
-  vlogLogPrint(p->pLog, tStart, tElapse, "CLOSE", -1, -1, 0, rc);
-  vlogLogClose(p->pLog);
-  return rc;
-}
-
-/*
-** Compute signature for a block of content.
-**
-** For blocks of 16 or fewer bytes, the signature is just a hex dump of
-** the entire block.
-**
-** For blocks of more than 16 bytes, the signature is a hex dump of the
-** first 8 bytes followed by a 64-bit has of the entire block.
-*/
-static void vlogSignature(unsigned char *p, int n, char *zCksum){
-  unsigned int s0 = 0, s1 = 0;
-  unsigned int *pI;
-  int i;
-  if( n<=16 ){
-    for(i=0; i<n; i++) sqlite3_snprintf(3, zCksum+i*2, "%02x", p[i]);
-  }else{ 
-    pI = (unsigned int*)p;
-    for(i=0; i<n-7; i+=8){
-      s0 += pI[0] + s1;
-      s1 += pI[1] + s0;
-      pI += 2;
-    }
-    for(i=0; i<8; i++) sqlite3_snprintf(3, zCksum+i*2, "%02x", p[i]);
-    sqlite3_snprintf(18, zCksum+i*2, "-%08x%08x", s0, s1);
-  }
-}
-
-/*
-** Convert a big-endian 32-bit integer into a native integer
-*/
-static int bigToNative(const unsigned char *x){
-  return (x[0]<<24) + (x[1]<<16) + (x[2]<<8) + x[3];
-}
-
-/*
-** Read data from an vlog-file.
-*/
-static int vlogRead(
-  sqlite3_file *pFile, 
-  void *zBuf, 
-  int iAmt, 
-  sqlite_int64 iOfst
-){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogFile *p = (VLogFile *)pFile;
-  char zSig[40];
-
-  tStart = vlog_time();
-  rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);
-  tElapse = vlog_time() - tStart;
-  if( rc==SQLITE_OK ){
-    vlogSignature(zBuf, iAmt, zSig);
-  }else{
-    zSig[0] = 0;
-  }
-  vlogLogPrint(p->pLog, tStart, tElapse, "READ", iAmt, iOfst, zSig, rc);
-  if( rc==SQLITE_OK
-   && p->pLog
-   && p->pLog->zFilename
-   && iOfst<=24
-   && iOfst+iAmt>=28
-  ){
-    unsigned char *x = ((unsigned char*)zBuf)+(24-iOfst);
-    unsigned iCtr, nFree = -1;
-    char *zFree = 0;
-    char zStr[12];
-    iCtr = bigToNative(x);
-    if( iOfst+iAmt>=40 ){
-      zFree = zStr;
-      sqlite3_snprintf(sizeof(zStr), zStr, "%d", bigToNative(x+8));
-      nFree = bigToNative(x+12);
-    }
-    vlogLogPrint(p->pLog, tStart, 0, "CHNGCTR-READ", iCtr, nFree, zFree, 0);
-  }
-  return rc;
-}
-
-/*
-** Write data to an vlog-file.
-*/
-static int vlogWrite(
-  sqlite3_file *pFile,
-  const void *z,
-  int iAmt,
-  sqlite_int64 iOfst
-){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogFile *p = (VLogFile *)pFile;
-  char zSig[40];
-
-  tStart = vlog_time();
-  vlogSignature((unsigned char*)z, iAmt, zSig);
-  rc = p->pReal->pMethods->xWrite(p->pReal, z, iAmt, iOfst);
-  tElapse = vlog_time() - tStart;
-  vlogLogPrint(p->pLog, tStart, tElapse, "WRITE", iAmt, iOfst, zSig, rc);
-  if( rc==SQLITE_OK
-   && p->pLog
-   && p->pLog->zFilename
-   && iOfst<=24
-   && iOfst+iAmt>=28
-  ){
-    unsigned char *x = ((unsigned char*)z)+(24-iOfst);
-    unsigned iCtr, nFree = -1;
-    char *zFree = 0;
-    char zStr[12];
-    iCtr = bigToNative(x);
-    if( iOfst+iAmt>=40 ){
-      zFree = zStr;
-      sqlite3_snprintf(sizeof(zStr), zStr, "%d", bigToNative(x+8));
-      nFree = bigToNative(x+12);
-    }
-    vlogLogPrint(p->pLog, tStart, 0, "CHNGCTR-WRITE", iCtr, nFree, zFree, 0);
-  }
-  return rc;
-}
-
-/*
-** Truncate an vlog-file.
-*/
-static int vlogTruncate(sqlite3_file *pFile, sqlite_int64 size){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogFile *p = (VLogFile *)pFile;
-  tStart = vlog_time();
-  rc = p->pReal->pMethods->xTruncate(p->pReal, size);
-  tElapse = vlog_time() - tStart;
-  vlogLogPrint(p->pLog, tStart, tElapse, "TRUNCATE", size, -1, 0, rc);
-  return rc;
-}
-
-/*
-** Sync an vlog-file.
-*/
-static int vlogSync(sqlite3_file *pFile, int flags){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogFile *p = (VLogFile *)pFile;
-  tStart = vlog_time();
-  rc = p->pReal->pMethods->xSync(p->pReal, flags);
-  tElapse = vlog_time() - tStart;
-  vlogLogPrint(p->pLog, tStart, tElapse, "SYNC", flags, -1, 0, rc);
-  return rc;
-}
-
-/*
-** Return the current file-size of an vlog-file.
-*/
-static int vlogFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogFile *p = (VLogFile *)pFile;
-  tStart = vlog_time();
-  rc = p->pReal->pMethods->xFileSize(p->pReal, pSize);
-  tElapse = vlog_time() - tStart;
-  vlogLogPrint(p->pLog, tStart, tElapse, "FILESIZE", *pSize, -1, 0, rc);
-  return rc;
-}
-
-/*
-** Lock an vlog-file.
-*/
-static int vlogLock(sqlite3_file *pFile, int eLock){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogFile *p = (VLogFile *)pFile;
-  tStart = vlog_time();
-  rc = p->pReal->pMethods->xLock(p->pReal, eLock);
-  tElapse = vlog_time() - tStart;
-  vlogLogPrint(p->pLog, tStart, tElapse, "LOCK", eLock, -1, 0, rc);
-  return rc;
-}
-
-/*
-** Unlock an vlog-file.
-*/
-static int vlogUnlock(sqlite3_file *pFile, int eLock){
-  int rc;
-  sqlite3_uint64 tStart;
-  VLogFile *p = (VLogFile *)pFile;
-  tStart = vlog_time();
-  vlogLogPrint(p->pLog, tStart, 0, "UNLOCK", eLock, -1, 0, 0);
-  rc = p->pReal->pMethods->xUnlock(p->pReal, eLock);
-  return rc;
-}
-
-/*
-** Check if another file-handle holds a RESERVED lock on an vlog-file.
-*/
-static int vlogCheckReservedLock(sqlite3_file *pFile, int *pResOut){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogFile *p = (VLogFile *)pFile;
-  tStart = vlog_time();
-  rc = p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut);
-  tElapse = vlog_time() - tStart;
-  vlogLogPrint(p->pLog, tStart, tElapse, "CHECKRESERVEDLOCK",
-                 *pResOut, -1, "", rc);
-  return rc;
-}
-
-/*
-** File control method. For custom operations on an vlog-file.
-*/
-static int vlogFileControl(sqlite3_file *pFile, int op, void *pArg){
-  VLogFile *p = (VLogFile *)pFile;
-  sqlite3_uint64 tStart, tElapse;
-  int rc;
-  tStart = vlog_time();
-  rc = p->pReal->pMethods->xFileControl(p->pReal, op, pArg);
-  if( op==SQLITE_FCNTL_VFSNAME && rc==SQLITE_OK ){
-    *(char**)pArg = sqlite3_mprintf("vlog/%z", *(char**)pArg);
-  }
-  tElapse = vlog_time() - tStart;
-  if( op==SQLITE_FCNTL_TRACE ){
-    vlogLogPrint(p->pLog, tStart, tElapse, "TRACE", op, -1, pArg, rc);
-  }else if( op==SQLITE_FCNTL_PRAGMA ){
-    const char **azArg = (const char **)pArg;
-    vlogLogPrint(p->pLog, tStart, tElapse, "FILECONTROL", op, -1, azArg[1], rc);
-  }else if( op==SQLITE_FCNTL_SIZE_HINT ){
-    sqlite3_int64 sz = *(sqlite3_int64*)pArg;
-    vlogLogPrint(p->pLog, tStart, tElapse, "FILECONTROL", op, sz, 0, rc);
-  }else{
-    vlogLogPrint(p->pLog, tStart, tElapse, "FILECONTROL", op, -1, 0, rc);
-  }
-  return rc;
-}
-
-/*
-** Return the sector-size in bytes for an vlog-file.
-*/
-static int vlogSectorSize(sqlite3_file *pFile){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogFile *p = (VLogFile *)pFile;
-  tStart = vlog_time();
-  rc = p->pReal->pMethods->xSectorSize(p->pReal);
-  tElapse = vlog_time() - tStart;
-  vlogLogPrint(p->pLog, tStart, tElapse, "SECTORSIZE", -1, -1, 0, rc);
-  return rc;
-}
-
-/*
-** Return the device characteristic flags supported by an vlog-file.
-*/
-static int vlogDeviceCharacteristics(sqlite3_file *pFile){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogFile *p = (VLogFile *)pFile;
-  tStart = vlog_time();
-  rc = p->pReal->pMethods->xDeviceCharacteristics(p->pReal);
-  tElapse = vlog_time() - tStart;
-  vlogLogPrint(p->pLog, tStart, tElapse, "DEVCHAR", -1, -1, 0, rc);
-  return rc;
-}
-
-
-/*
-** Open an vlog file handle.
-*/
-static int vlogOpen(
-  sqlite3_vfs *pVfs,
-  const char *zName,
-  sqlite3_file *pFile,
-  int flags,
-  int *pOutFlags
-){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  sqlite3_int64 iArg2;
-  VLogFile *p = (VLogFile*)pFile;
-
-  p->pReal = (sqlite3_file*)&p[1];
-  if( (flags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_MAIN_JOURNAL))!=0 ){
-    p->pLog = vlogLogOpen(zName);
-  }else{
-    p->pLog = 0;
-  }
-  tStart = vlog_time();
-  rc = REALVFS(pVfs)->xOpen(REALVFS(pVfs), zName, p->pReal, flags, pOutFlags);
-  tElapse = vlog_time() - tStart;
-  iArg2 = pOutFlags ? *pOutFlags : -1;
-  vlogLogPrint(p->pLog, tStart, tElapse, "OPEN", flags, iArg2, 0, rc);
-  if( rc==SQLITE_OK ){
-    pFile->pMethods = &vlog_io_methods;
-  }else{
-    if( p->pLog ) vlogLogClose(p->pLog);
-    p->pLog = 0;
-  }
-  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 vlogDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogLog *pLog;
-  tStart = vlog_time();
-  rc = REALVFS(pVfs)->xDelete(REALVFS(pVfs), zPath, dirSync);
-  tElapse = vlog_time() - tStart;
-  pLog = vlogLogOpen(zPath);
-  vlogLogPrint(pLog, tStart, tElapse, "DELETE", dirSync, -1, 0, rc);
-  vlogLogClose(pLog);
-  return rc;
-}
-
-/*
-** Test for access permissions. Return true if the requested permission
-** is available, or false otherwise.
-*/
-static int vlogAccess(
-  sqlite3_vfs *pVfs, 
-  const char *zPath, 
-  int flags, 
-  int *pResOut
-){
-  int rc;
-  sqlite3_uint64 tStart, tElapse;
-  VLogLog *pLog;
-  tStart = vlog_time();
-  rc = REALVFS(pVfs)->xAccess(REALVFS(pVfs), zPath, flags, pResOut);
-  tElapse = vlog_time() - tStart;
-  pLog = vlogLogOpen(zPath);
-  vlogLogPrint(pLog, tStart, tElapse, "ACCESS", flags, *pResOut, 0, rc);
-  vlogLogClose(pLog);
-  return rc;
-}
-
-/*
-** 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 (INST_MAX_PATHNAME+1) bytes.
-*/
-static int vlogFullPathname(
-  sqlite3_vfs *pVfs, 
-  const char *zPath, 
-  int nOut, 
-  char *zOut
-){
-  return REALVFS(pVfs)->xFullPathname(REALVFS(pVfs), zPath, nOut, zOut);
-}
-
-/*
-** Open the dynamic library located at zPath and return a handle.
-*/
-static void *vlogDlOpen(sqlite3_vfs *pVfs, const char *zPath){
-  return REALVFS(pVfs)->xDlOpen(REALVFS(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 vlogDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
-  REALVFS(pVfs)->xDlError(REALVFS(pVfs), nByte, zErrMsg);
-}
-
-/*
-** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
-*/
-static void (*vlogDlSym(sqlite3_vfs *pVfs, void *p, const char *zSym))(void){
-  return REALVFS(pVfs)->xDlSym(REALVFS(pVfs), p, zSym);
-}
-
-/*
-** Close the dynamic library handle pHandle.
-*/
-static void vlogDlClose(sqlite3_vfs *pVfs, void *pHandle){
-  REALVFS(pVfs)->xDlClose(REALVFS(pVfs), pHandle);
-}
-
-/*
-** Populate the buffer pointed to by zBufOut with nByte bytes of 
-** random data.
-*/
-static int vlogRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
-  return REALVFS(pVfs)->xRandomness(REALVFS(pVfs), nByte, zBufOut);
-}
-
-/*
-** Sleep for nMicro microseconds. Return the number of microseconds 
-** actually slept.
-*/
-static int vlogSleep(sqlite3_vfs *pVfs, int nMicro){
-  return REALVFS(pVfs)->xSleep(REALVFS(pVfs), nMicro);
-}
-
-/*
-** Return the current time as a Julian Day number in *pTimeOut.
-*/
-static int vlogCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
-  return REALVFS(pVfs)->xCurrentTime(REALVFS(pVfs), pTimeOut);
-}
-
-static int vlogGetLastError(sqlite3_vfs *pVfs, int a, char *b){
-  return REALVFS(pVfs)->xGetLastError(REALVFS(pVfs), a, b);
-}
-static int vlogCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *p){
-  return REALVFS(pVfs)->xCurrentTimeInt64(REALVFS(pVfs), p);
-}
-
-/*
-** Register debugvfs as the default VFS for this process.
-*/
-int sqlite3_register_vfslog(const char *zArg){
-  vlog_vfs.pVfs = sqlite3_vfs_find(0);
-  vlog_vfs.base.szOsFile = sizeof(VLogFile) + vlog_vfs.pVfs->szOsFile;
-  return sqlite3_vfs_register(&vlog_vfs.base, 1);
-}