SQLite

    /*
    ** Reset the PRNG back to its uninitialized state.  The next call
    ** to sqlite3_randomness() will reseed the PRNG using a single call
    ** to the xRandomness method of the default VFS.
    */
    case SQLITE_TESTCTRL_PRNG_RESET: {
      sqlite3_randomness(0,0);
      break;
    }

    /*
    **  sqlite3_test_control(BITVEC_TEST, size, program)
    **
    ** Run a test against a Bitvec object of size.  The program argument

  /* In test mode, increase the size of this structure a bit so that 
  ** it is larger than the struct CrashFile defined in test6.c.
  */
  char aPadding[32];
#endif
};

/* This variable holds the process id (pid) from when the xRandomness()
** method was called.  If xOpen() is called from a different process id,
** indicating that a fork() has occurred, the PRNG will be reset.
*/
static int randomnessPid = 0;

/*
** Allowed values for the unixFile.ctrlFlags bitmask:
*/
#define UNIXFILE_EXCL        0x01     /* Connections from one process only */
#define UNIXFILE_RDONLY      0x02     /* Connection is read only */
#define UNIXFILE_PERSIST_WAL 0x04     /* Persistent WAL mode */
#ifndef SQLITE_DISABLE_DIRSYNC

  /* Assert that the upper layer has set one of the "file-type" flags. */
  assert( eType==SQLITE_OPEN_MAIN_DB      || eType==SQLITE_OPEN_TEMP_DB 
       || eType==SQLITE_OPEN_MAIN_JOURNAL || eType==SQLITE_OPEN_TEMP_JOURNAL 
       || eType==SQLITE_OPEN_SUBJOURNAL   || eType==SQLITE_OPEN_MASTER_JOURNAL 
       || eType==SQLITE_OPEN_TRANSIENT_DB || eType==SQLITE_OPEN_WAL
  );

  /* Detect a pid change and reset the PRNG.  There is a race condition
  ** here such that two or more threads all trying to open databases at
  ** the same instant might all reset the PRNG.  But multiple resets
  ** are harmless.
  */
  if( randomnessPid!=getpid() ){
    randomnessPid = getpid();
    sqlite3_randomness(0,0);
  }

  memset(p, 0, sizeof(unixFile));

  if( eType==SQLITE_OPEN_MAIN_DB ){
    UnixUnusedFd *pUnused;
    pUnused = findReusableFd(zName, flags);
    if( pUnused ){

  ** in the random seed.
  **
  ** When testing, initializing zBuf[] to zero is all we do.  That means
  ** that we always use the same random number sequence.  This makes the
  ** tests repeatable.
  */
  memset(zBuf, 0, nBuf);
  randomnessPid = getpid();  
#if !defined(SQLITE_TEST)
  {
    int fd, got;
    fd = robust_open("/dev/urandom", O_RDONLY, 0);
    if( fd<0 ){
      time_t t;
      time(&t);
      memcpy(zBuf, &t, sizeof(t));

      memcpy(&zBuf[sizeof(t)], &randomnessPid, sizeof(randomnessPid));
      assert( sizeof(t)+sizeof(randomnessPid)<=(size_t)nBuf );
      nBuf = sizeof(t) + sizeof(randomnessPid);
    }else{
      do{ got = osRead(fd, zBuf, nBuf); }while( got<0 && errno==EINTR );
      robust_close(0, fd, __LINE__);
    }
  }
#endif
  return nBuf;

    }
    case SQLITE_FCNTL_POWERSAFE_OVERWRITE: {
      winModeBit(pFile, WINFILE_PSOW, (int*)pArg);
      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
      return SQLITE_OK;
    }
    case SQLITE_FCNTL_VFSNAME: {
      *(char**)pArg = sqlite3_mprintf("%s", pFile->pVfs->zName);
      OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
      return SQLITE_OK;
    }
    case SQLITE_FCNTL_WIN32_AV_RETRY: {
      int *a = (int*)pArg;
      if( a[0]>0 ){
        winIoerrRetry = a[0];

*/
static void winShmEnterMutex(void){
  sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
static void winShmLeaveMutex(void){
  sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
#ifndef NDEBUG
static int winShmMutexHeld(void) {
  return sqlite3_mutex_held(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
#endif

/*
** Object used to represent a single file opened and mmapped to provide

# define wsdPrng sqlite3Prng
#endif

#if SQLITE_THREADSAFE
  sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_PRNG);
  sqlite3_mutex_enter(mutex);
#endif

  if( N<=0 ){
    wsdPrng.isInit = 0;
    sqlite3_mutex_leave(mutex);
    return;
  }

  /* Initialize the state of the random number generator once,
  ** the first time this routine is called.  The seed value does
  ** not need to contain a lot of randomness since we are not
  ** trying to do secure encryption or anything like that...
  **
  ** Nothing in this file or anywhere else in SQLite does any kind of

      t = wsdPrng.s[wsdPrng.j];
      wsdPrng.s[wsdPrng.j] = wsdPrng.s[i];
      wsdPrng.s[i] = t;
    }
    wsdPrng.isInit = 1;
  }

  assert( N>0 );
  do{
    wsdPrng.i++;
    t = wsdPrng.s[wsdPrng.i];
    wsdPrng.j += t;
    wsdPrng.s[wsdPrng.i] = wsdPrng.s[wsdPrng.j];
    wsdPrng.s[wsdPrng.j] = t;
    t += wsdPrng.s[wsdPrng.i];
    *(zBuf++) = wsdPrng.s[t];
  }while( --N );
  sqlite3_mutex_leave(mutex);
}

#ifndef SQLITE_OMIT_BUILTIN_TEST
/*
** For testing purposes, we sometimes want to preserve the state of
** PRNG and restore the PRNG to its saved state at a later time, or

void sqlite3PrngRestoreState(void){
  memcpy(
    &GLOBAL(struct sqlite3PrngType, sqlite3Prng),
    &GLOBAL(struct sqlite3PrngType, sqlite3SavedPrng),
    sizeof(sqlite3Prng)
  );
}



#endif /* SQLITE_OMIT_BUILTIN_TEST */

** SQLite contains a high-quality pseudo-random number generator (PRNG) used to
** select random [ROWID | ROWIDs] when inserting new records into a table that
** already uses the largest possible [ROWID].  The PRNG is also used for
** the build-in random() and randomblob() SQL functions.  This interface allows
** applications to access the same PRNG for other purposes.
**
** ^A call to this routine stores N bytes of randomness into buffer P.
** ^If N is less than one, then P can be a NULL pointer.
**
** ^If this routine has not been previously called or if the previous
** call had N less than one, then the PRNG is seeded using randomness
** obtained from the xRandomness method of the default [sqlite3_vfs] object.
** ^If the previous call to this routine had an N of 1 or more then
** the pseudo-randomness is generated
** internally and without recourse to the [sqlite3_vfs] xRandomness
** method.
*/
void sqlite3_randomness(int N, void *P);

/*
** CAPI3REF: Compile-Time Authorization Callbacks

int sqlite3ExprImpliesExpr(Expr*, Expr*, int);
void sqlite3ExprAnalyzeAggregates(NameContext*, Expr*);
void sqlite3ExprAnalyzeAggList(NameContext*,ExprList*);
int sqlite3FunctionUsesThisSrc(Expr*, SrcList*);
Vdbe *sqlite3GetVdbe(Parse*);
void sqlite3PrngSaveState(void);
void sqlite3PrngRestoreState(void);

void sqlite3RollbackAll(sqlite3*,int);
void sqlite3CodeVerifySchema(Parse*, int);
void sqlite3CodeVerifyNamedSchema(Parse*, const char *zDb);
void sqlite3BeginTransaction(Parse*, int);
void sqlite3CommitTransaction(Parse*);
void sqlite3RollbackTransaction(Parse*);
void sqlite3Savepoint(Parse*, int, Token*);

#

if {$tcl_platform(platform)!="windows"} return

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix win32longpath

do_test 1.0 {
  file_control_vfsname db
} win32

db close
set path [file nativename [get_pwd]]
sqlite3 db [file join $path test.db] -vfs win32-longpath

do_test 1.1 {
  file_control_vfsname db
} win32-longpath

do_test 1.2 {
  db eval {
    BEGIN EXCLUSIVE;
    CREATE TABLE t1(x);
    INSERT INTO t1 VALUES(1);
    INSERT INTO t1 VALUES(2);
    INSERT INTO t1 VALUES(3);
    INSERT INTO t1 VALUES(4);

make_win32_dir $longPath(2)

set longPath(3) $longPath(2)\\[string repeat Y 255]
make_win32_dir $longPath(3)

set fileName $longPath(3)\\test.db

do_test 1.3 {
  list [catch {sqlite3 db2 [string range $fileName 4 end]} msg] $msg
} {1 {unable to open database file}}

sqlite3 db3 $fileName -vfs win32-longpath

do_test 1.4 {
  db3 eval {
    BEGIN EXCLUSIVE;
    CREATE TABLE t1(x);
    INSERT INTO t1 VALUES(5);
    INSERT INTO t1 VALUES(6);
    INSERT INTO t1 VALUES(7);
    INSERT INTO t1 VALUES(8);
    SELECT x FROM t1 ORDER BY x;
    COMMIT;
  }
} {5 6 7 8}

db3 close
# puts "  Database exists \{[exists_win32_path $fileName]\}"

sqlite3 db3 $fileName -vfs win32-longpath

do_test 1.5 {
  db3 eval {
    PRAGMA journal_mode = WAL;
  }
} {wal}

do_test 1.6 {
  db3 eval {
    BEGIN EXCLUSIVE;
    INSERT INTO t1 VALUES(9);
    INSERT INTO t1 VALUES(10);
    INSERT INTO t1 VALUES(11);
    INSERT INTO t1 VALUES(12);
    SELECT x FROM t1 ORDER BY x;