)){
    return TCL_ERROR;
  }

  rc = sqlite3_wal_checkpoint_v2(db, zDb, eMode, &nLog, &nCkpt);
  if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
    const char *zErrCode = sqlite3ErrName(rc);

    Tcl_AppendResult(interp, zErrCode, " - ", (char *)sqlite3_errmsg(db), 0);
    return TCL_ERROR;
  }

  pRet = Tcl_NewObj();
  Tcl_ListObjAppendElement(interp, pRet, Tcl_NewIntObj(rc==SQLITE_BUSY?1:0));
  Tcl_ListObjAppendElement(interp, pRet, Tcl_NewIntObj(nLog));

  )){
    return TCL_ERROR;
  }

  rc = sqlite3_wal_checkpoint_v2(db, zDb, eMode, &nLog, &nCkpt);
  if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
    const char *zErrCode = sqlite3ErrName(rc);
    Tcl_ResetResult(interp);
    Tcl_AppendResult(interp, zErrCode, " - ", (char *)sqlite3_errmsg(db), 0);
    return TCL_ERROR;
  }

  pRet = Tcl_NewObj();
  Tcl_ListObjAppendElement(interp, pRet, Tcl_NewIntObj(rc==SQLITE_BUSY?1:0));
  Tcl_ListObjAppendElement(interp, pRet, Tcl_NewIntObj(nLog));

    set expect 0
    catch { set expect [md5file $f] }
    if {$H($f) != $expect} { lappend ret $f }
  }
  set ret
}


































# The following tests are run 3 times, each using a different method of 
# invoking a checkpoint:
#
#   1) Using sqlite3_wal_checkpoint_v2()
#   2) Using "PRAGMA wal_checkpoint"
#   3) Using sqlite3_wal_checkpoint() in place of checkpoint_v2(PASSIVE)
................................................................................
# EVIDENCE-OF: R-41613-20553 The sqlite3_wal_checkpoint(D,X) is
# equivalent to
# sqlite3_wal_checkpoint_v2(D,X,SQLITE_CHECKPOINT_PASSIVE,0,0).
# 
foreach {tn script} {
  1 {
    proc checkpoint {db mode args} {
      eval sqlite3_wal_checkpoint_v2 [list $db] [list $mode] $args
    }
  }

  2 {
    proc checkpoint {db mode args} {
      set sql "PRAGMA wal_checkpoint = $mode"
      if {[llength $args] && [lindex $args 0]!=""} {
................................................................................
    proc checkpoint {db mode args} {
      if {$mode == "passive"} {
        set rc [eval sqlite3_wal_checkpoint [list $db] $args]
        if {$rc != "SQLITE_OK"} {
          error "$rc - [sqlite3_errmsg $db]"
        }
      } else {
        eval sqlite3_wal_checkpoint_v2 [list $db] [list $mode] $args
      }
    }
  }

} {

  eval $script
................................................................................
    switch -- $busy_handler_mode {
      1 {
        # Do nothing. Do not block.
        return 1
      }

      2 {
        # Close first the reader, then later the writer.

        if {$n==5}  { catch {db2 eval commit} }
        if {$n==10} { catch {db3 eval commit} }

        return 0
      }

      3 {
        # Close first the writer, then later the reader.

        if {$n==5}  { catch {db2 eval commit} }
        if {$n==10} { catch {db3 eval commit} }

        return 0
      }
    }
  }

  foreach {mode busy_handler_mode} { 
    passive 1
    full    1
    full    2
    full    3
  } {


    set ::sync_counter 0





    proc tvfs_callback {method args} {


      set tail [file tail [lindex $args 0]]
      if {$method == "xSync" && $tail == "test.db"} {
        incr ::sync_counter
      }

      if {$method == "xWrite" && $tail=="test.db"} {
        if {$::write_ok < 0} {
          set ::write_ok [expr ![catch {db5 eval { BEGIN IMMEDIATE }}]]
          catch { db5 eval ROLLBACK }
        }
        if {$::read_ok < 0} {
          set ::read_ok [expr ![catch {db5 eval { SELECT * FROM t1 }}]]
        }








      }
    }

    catch { db close }
    forcedelete test.db
    testvfs tvfs
    sqlite3 db test.db -vfs tvfs
    #tvfs filter xSync
    tvfs script tvfs_callback

    do_execsql_test $tn.4.$mode.0 {
      CREATE TABLE t1(a, b);
      CREATE TABLE t2(a, b);
      PRAGMA journal_mode = wal;
      INSERT INTO t1 VALUES(1, 2);
      INSERT INTO t1 VALUES(3, 4);
      INSERT INTO t1 VALUES(5, 6);
    } {wal}

    # Open a reader on the current database snapshot.
    do_test $tn.4.$mode.1 {
      sqlite3 db2 test.db -vfs tvfs
      execsql {
        BEGIN;
          SELECT * FROM t1 UNION ALL SELECT * FROM t2;
      } db2
    } {1 2 3 4 5 6}

    # Open a writer. Write a transaction. Then begin, but do not commit,
    # a second transaction.
    do_test $tn.4.$mode.2 {
      sqlite3 db3 test.db -vfs tvfs
      execsql {
        INSERT INTO t2 VALUES(7, 8);
        BEGIN;
          INSERT INTO t2 VALUES(9, 10);
          SELECT * FROM t1 UNION ALL SELECT * FROM t2;
      } db3
    } {1 2 3 4 5 6 7 8 9 10}

    sqlite3 db5 test.db -vfs tvfs


    # Register a busy-handler with connection [db].
    #
    db busy [list busy_handler $mode $busy_handler_mode]
    set ::sync_counter 0
    set ::busy_handler_counter 0
    set ::read_ok -1
    set ::write_ok -1

    

    do_test $tn.4.$mode.3 {
      checkpoint db $mode main
      set {} {}
    } {}



    if { $mode=="passive" } {
      # EVIDENCE-OF: R-16333-64433 Checkpoint as many frames as possible
      # without waiting for any database readers or writers to finish, then
      # sync the database file if all frames in the log were checkpointed.
      #
      #   "As many frames as possible" means all but the last two transactions
................................................................................
      #   writer are still active - so the checkpointer did not wait for either
      #   readers or writers. As a result the checkpoint was not finished and
      #   so the db file is not synced.
      #
      # EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
      # in the SQLITE_CHECKPOINT_PASSIVE mode.
      #
      #   It's not. Test case "$tn.4.$mode.6".
      #
      do_test $tn.4.$mode.4 {
        forcecopy test.db abc.db
        sqlite3 db4 abc.db
        db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
      } {1 2 3 4 5 6}
      do_test $tn.4.$mode.5 { set ::sync_counter } 0
      do_test $tn.4.$mode.6 { set ::busy_handler_counter } 0
      db4 close
  
      db2 eval COMMIT
      db3 eval COMMIT
  
      # EVIDENCE-OF: R-65499-53765 On the other hand, passive mode might leave
      # the checkpoint unfinished if there are concurrent readers or writers.
................................................................................
      #   The reader and writer have now dropped their locks. And so a 
      #   checkpoint now is able to checkpoint more frames. Showing that the
      #   attempt above was left "unfinished".
      #
      #   Also, because the checkpoint finishes this time, the db is synced.
      #   Which is part of R-16333-64433 above.
      #

      do_test $tn.4.$mode.7 {
        checkpoint db $mode main
        forcecopy test.db abc.db
        sqlite3 db4 abc.db
        db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
      } {1 2 3 4 5 6 7 8 9 10}

      do_test $tn.4.$mode.6 { set ::sync_counter } 1
      do_test $tn.4.$mode.7 { set ::busy_handler_counter } 0
      db4 close
    }

    if { $mode=="full" } {











      if {$busy_handler_mode==2 || $busy_handler_mode==3} {
        # EVIDENCE-OF: R-59171-47567 This mode blocks (it invokes the
        # busy-handler callback) until there is no database writer and all
        # readers are reading from the most recent database snapshot.
        #
        #   Show that both the reader and writer have finished:

        #













        do_test $tn.4.$mode.7 {
          list [catchsql COMMIT db2] [catchsql COMMIT db3]
        } [list                                             \
            {1 {cannot commit - no transaction is active}}  \
            {1 {cannot commit - no transaction is active}}  \
        ]

        # EVIDENCE-OF: R-29177-48281 It then checkpoints all frames in the log
        # file and syncs the database file.
        #
        do_test $tn.4.$mode.8 {
          forcecopy test.db abc.db
          sqlite3 db4 abc.db
          db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
        } {1 2 3 4 5 6 7 8 9 10}
        do_test $tn.4.$mode.9 { set ::sync_counter } 1
        db4 close

        # EVIDENCE-OF: R-51867-44713 This mode blocks new database writers
        # while it is pending, but new database readers are allowed to continue
        # unimpeded.








        do_test $tn.4.$mode.10 {
          list $::write_ok $::read_ok
        } {0 1}












































      }
    }

    db2 close
    db3 close
    db5 close

  }

  db close
  tvfs delete
}

#-----------------------------------------------------------------------
................................................................................
  4  2       {0 {0 -1 -1}}
  5  3       {0 {0 -1 -1}}
  6  4       {1 {SQLITE_MISUSE - not an error}}
  7  114     {1 {SQLITE_MISUSE - not an error}}
  8  1000000 {1 {SQLITE_MISUSE - not an error}}
} {
  do_test 4.$tn {
    list [catch "sqlite3_wal_checkpoint_v2 db $mode" msg] $msg
  } $res
}



































































































































finish_test

    set expect 0
    catch { set expect [md5file $f] }
    if {$H($f) != $expect} { lappend ret $f }
  }
  set ret
}

#-------------------------------------------------------------------------
# All calls to the [sqlite3_wal_checkpoint_v2] command made within this
# file use this wrapper. It's sole purpose is to throw an error if the
# following requirement is violated:
#
# EVIDENCE-OF: R-60567-47780 Unless it returns SQLITE_MISUSE, the
# sqlite3_wal_checkpoint_v2() interface sets the error information that
# is queried by sqlite3_errcode() and sqlite3_errmsg().
#
proc wal_checkpoint_v2 {db args} {
  set rc [catch {
    uplevel sqlite3_wal_checkpoint_v2 $db $args
  } msg]

  set errcode "SQLITE_OK"
  if {$rc} {
    set errcode [lindex [split $msg " "] 0]
  } elseif { [lindex $msg 0] } {
    set errcode "SQLITE_BUSY"
  }

  if {$errcode != "SQLITE_MISUSE" && [sqlite3_errcode $db] != $errcode} {
    error "sqlite3_errcode mismatch! (1) $errcode!=[sqlite3_errcode $db]"
  }

  if {$rc==0} {
    return $msg
  } else {
    error $msg
  }
}


# The following tests are run 3 times, each using a different method of 
# invoking a checkpoint:
#
#   1) Using sqlite3_wal_checkpoint_v2()
#   2) Using "PRAGMA wal_checkpoint"
#   3) Using sqlite3_wal_checkpoint() in place of checkpoint_v2(PASSIVE)
................................................................................
# EVIDENCE-OF: R-41613-20553 The sqlite3_wal_checkpoint(D,X) is
# equivalent to
# sqlite3_wal_checkpoint_v2(D,X,SQLITE_CHECKPOINT_PASSIVE,0,0).
# 
foreach {tn script} {
  1 {
    proc checkpoint {db mode args} {
      eval wal_checkpoint_v2 [list $db] [list $mode] $args
    }
  }

  2 {
    proc checkpoint {db mode args} {
      set sql "PRAGMA wal_checkpoint = $mode"
      if {[llength $args] && [lindex $args 0]!=""} {
................................................................................
    proc checkpoint {db mode args} {
      if {$mode == "passive"} {
        set rc [eval sqlite3_wal_checkpoint [list $db] $args]
        if {$rc != "SQLITE_OK"} {
          error "$rc - [sqlite3_errmsg $db]"
        }
      } else {
        eval wal_checkpoint_v2 [list $db] [list $mode] $args
      }
    }
  }

} {

  eval $script
................................................................................
    switch -- $busy_handler_mode {
      1 {
        # Do nothing. Do not block.
        return 1
      }

      2 {
        # Close first the reader, then later the writer. Give up before
        # closing the [db6] reader.
        if {$n==5}  { catch {db2 eval commit} }
        if {$n==10} { catch {db3 eval commit} }
        if {$n==15} { return 1 }
        return 0
      }

      3 {
        # Close first the writer, then later the reader. And finally the 
        # [db6] reader.
        if {$n==5}  { catch {db2 eval commit} }
        if {$n==10} { catch {db3 eval commit} }
        if {$n==15} { catch {db6 eval commit} }
        return 0
      }
    }
  }

  foreach {mode busy_handler_mode} { 
    passive  1
    full     1       full     2       full    3
    restart  1       restart  2       restart  3
    truncate 1       truncate 2       truncate 3
  } {
    set tp "$tn.$mode.$busy_handler_mode"

    set ::sync_counter 0

    # Set up a callback function for xSync and xWrite calls made during
    # the checkpoint.
    #
    set ::checkpoint_ongoing 0
    proc tvfs_callback {method args} {
      if {$::checkpoint_ongoing==0} return

      set tail [file tail [lindex $args 0]]
      if {$method == "xSync" && $tail == "test.db"} {
        incr ::sync_counter
      }

      if {$method == "xWrite" && $tail=="test.db"} {
        if {$::write_ok < 0} {
          set ::write_ok [expr ![catch {db5 eval { BEGIN IMMEDIATE }}]]
          catch { db5 eval ROLLBACK }
        }
        if {$::read_ok < 0} {
          set ::read_ok [expr ![catch {db5 eval { SELECT * FROM t1 }}]]
        }

        # If one has not already been opened, open a read-transaction using
        # connection [db6]
        catch { db6 eval { BEGIN ; SELECT * FROM sqlite_master } } msg
      }
      if {$method == "xShmLock" } {
        set details [lindex $args 2]
        if {$details == "0 1 lock exclusive"} { set ::seen_writer_lock 1 }
      }
    }

    catch { db close }
    forcedelete test.db
    testvfs tvfs
    sqlite3 db test.db -vfs tvfs
    #tvfs filter xSync
    tvfs script tvfs_callback

    do_execsql_test $tp.0 {
      CREATE TABLE t1(a, b);
      CREATE TABLE t2(a, b);
      PRAGMA journal_mode = wal;
      INSERT INTO t1 VALUES(1, 2);
      INSERT INTO t1 VALUES(3, 4);
      INSERT INTO t1 VALUES(5, 6);
    } {wal}

    # Open a reader on the current database snapshot.
    do_test $tp.1 {
      sqlite3 db2 test.db -vfs tvfs
      execsql {
        BEGIN;
          SELECT * FROM t1 UNION ALL SELECT * FROM t2;
      } db2
    } {1 2 3 4 5 6}

    # Open a writer. Write a transaction. Then begin, but do not commit,
    # a second transaction.
    do_test $tp.2 {
      sqlite3 db3 test.db -vfs tvfs
      execsql {
        INSERT INTO t2 VALUES(7, 8);
        BEGIN;
          INSERT INTO t2 VALUES(9, 10);
          SELECT * FROM t1 UNION ALL SELECT * FROM t2;
      } db3
    } {1 2 3 4 5 6 7 8 9 10}

    sqlite3 db5 test.db -vfs tvfs
    sqlite3 db6 test.db -vfs tvfs

    # Register a busy-handler with connection [db].
    #
    db busy [list busy_handler $mode $busy_handler_mode]
    set ::sync_counter 0
    set ::busy_handler_counter 0
    set ::read_ok -1
    set ::write_ok -1
    set ::seen_writer_lock 0
    
    set ::checkpoint_ongoing 1
    do_test $tp.3 {
      checkpoint db $mode main
      set {} {}
    } {}
    set ::checkpoint_ongoing 0
    set ::did_restart_blocking [expr {[catch {db6 eval commit}]}]

    if { $mode=="passive" } {
      # EVIDENCE-OF: R-16333-64433 Checkpoint as many frames as possible
      # without waiting for any database readers or writers to finish, then
      # sync the database file if all frames in the log were checkpointed.
      #
      #   "As many frames as possible" means all but the last two transactions
................................................................................
      #   writer are still active - so the checkpointer did not wait for either
      #   readers or writers. As a result the checkpoint was not finished and
      #   so the db file is not synced.
      #
      # EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
      # in the SQLITE_CHECKPOINT_PASSIVE mode.
      #
      #   It's not. Test case "$tp.6".
      #
      do_test $tp.4 {
        forcecopy test.db abc.db
        sqlite3 db4 abc.db
        db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
      } {1 2 3 4 5 6}
      do_test $tp.5 { set ::sync_counter } 0
      do_test $tp.6 { set ::busy_handler_counter } 0
      db4 close
  
      db2 eval COMMIT
      db3 eval COMMIT
  
      # EVIDENCE-OF: R-65499-53765 On the other hand, passive mode might leave
      # the checkpoint unfinished if there are concurrent readers or writers.
................................................................................
      #   The reader and writer have now dropped their locks. And so a 
      #   checkpoint now is able to checkpoint more frames. Showing that the
      #   attempt above was left "unfinished".
      #
      #   Also, because the checkpoint finishes this time, the db is synced.
      #   Which is part of R-16333-64433 above.
      #
      set ::checkpoint_ongoing 1
      do_test $tp.7 {
        checkpoint db $mode main
        forcecopy test.db abc.db
        sqlite3 db4 abc.db
        db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
      } {1 2 3 4 5 6 7 8 9 10}
      set ::checkpoint_ongoing 0
      do_test $tp.7 { set ::sync_counter } 1
      do_test $tp.8 { set ::busy_handler_counter } 0
      db4 close
    }

    if { $mode=="full" || $mode=="restart" || $mode=="truncate" } {

      # EVIDENCE-OF: R-59782-36818 The SQLITE_CHECKPOINT_FULL, RESTART and
      # TRUNCATE modes also obtain the exclusive "writer" lock on the 
      # database file.
      #
      #   Or at least attempts to obtain.
      #
      do_test $tp.9 {
        set ::seen_writer_lock
      } {1}

      if {$busy_handler_mode==2 || $busy_handler_mode==3} {
        # EVIDENCE-OF: R-59171-47567 This mode blocks (it invokes the
        # busy-handler callback) until there is no database writer and all
        # readers are reading from the most recent database snapshot.
        #
        #   The test below shows that both the reader and writer have 
        #   finished:
        #
        #   Also restated by the following two. That both busy_handler_mode
        #   values 2 and 3 work show that both of the following are true - as
        #   they release the reader and writer transactions in different
        #   orders.
        #
        # EVIDENCE-OF: R-60642-04082 If the writer lock cannot be obtained
        # immediately, and a busy-handler is configured, it is invoked and the
        # writer lock retried until either the busy-handler returns 0 or the
        # lock is successfully obtained.
        #
        # EVIDENCE-OF: R-48107-00250 The busy-handler is also invoked while
        # waiting for database readers as described above.
        #
        do_test $tp.7 {
          list [catchsql COMMIT db2] [catchsql COMMIT db3]
        } [list                                             \
            {1 {cannot commit - no transaction is active}}  \
            {1 {cannot commit - no transaction is active}}  \
        ]

        # EVIDENCE-OF: R-29177-48281 It then checkpoints all frames in the log
        # file and syncs the database file.
        #
        do_test $tp.8 {
          forcecopy test.db abc.db
          sqlite3 db4 abc.db
          db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
        } {1 2 3 4 5 6 7 8 9 10}
        do_test $tp.9 { set ::sync_counter } 1
        db4 close

        # EVIDENCE-OF: R-51867-44713 This mode blocks new database writers
        # while it is pending, but new database readers are allowed to continue
        # unimpeded.
        #
        # EVIDENCE-OF: R-47276-58266 Like SQLITE_CHECKPOINT_FULL, this mode
        # blocks new database writer attempts while it is pending, but does not
        # impede readers.
        #
        #   The first of the above two refers to "full" mode. The second
        #   to "restart".
        #
        do_test $tp.10.1 {
          list $::write_ok $::read_ok
        } {0 1}

        # EVIDENCE-OF: R-12410-31217 This mode works the same way as
        # SQLITE_CHECKPOINT_FULL with the addition that after checkpointing the
        # log file it blocks (calls the busy-handler callback) until all
        # readers are reading from the database file only.
        #
        #     The stuff above passed, so the first part of this requirement
        #     is met. The second part is tested below. If the checkpoint mode
        #     was "restart" or "truncate", then the busy-handler will have
        #     been called to block on wal-file readers.
        #
        do_test $tp.11 {
          set ::did_restart_blocking
        } [expr {($mode=="restart"||$mode=="truncate")&&$busy_handler_mode==3}]

        # EVIDENCE-OF: R-44699-57140 This mode works the same way as
        # SQLITE_CHECKPOINT_RESTART with the addition that it also truncates
        # the log file to zero bytes just prior to a successful return.
        if {$mode=="truncate" && $busy_handler_mode==3} {
          do_test $tp.12 {
            file size test.db-wal
          } 0
        }
      } elseif {$busy_handler_mode==1} {

        # EVIDENCE-OF: R-34519-06271 SQLITE_BUSY is returned in this case.
        if {$tn!=2} {
          # ($tn==2) is the loop that uses "PRAGMA wal_checkpoint"
          do_test $tp.13 { sqlite3_errcode db } {SQLITE_BUSY}
        }

        # EVIDENCE-OF: R-49155-63541 If the busy-handler returns 0 before the
        # writer lock is obtained or while waiting for database readers, the
        # checkpoint operation proceeds from that point in the same way as
        # SQLITE_CHECKPOINT_PASSIVE - checkpointing as many frames as possible
        # without blocking any further.
        do_test $tp.14 {
          forcecopy test.db abc.db
            sqlite3 db4 abc.db
            db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
        } {1 2 3 4 5 6}
        do_test $tp.15 { set ::sync_counter } 0
        do_test $tp.16 { set ::busy_handler_counter } 1
        db4 close
      }
    }

    db2 close
    db3 close
    db5 close
    db6 close
  }

  db close
  tvfs delete
}

#-----------------------------------------------------------------------
................................................................................
  4  2       {0 {0 -1 -1}}
  5  3       {0 {0 -1 -1}}
  6  4       {1 {SQLITE_MISUSE - not an error}}
  7  114     {1 {SQLITE_MISUSE - not an error}}
  8  1000000 {1 {SQLITE_MISUSE - not an error}}
} {
  do_test 4.$tn {
    list [catch "wal_checkpoint_v2 db $mode" msg] $msg
  } $res
}
db close

foreach tn {1 2 3} {
  forcedelete test.db test.db2 test.db3
  testvfs tvfs

  sqlite3 db test.db -vfs tvfs
  execsql {
    ATTACH 'test.db2' AS aux2;
    ATTACH 'test.db3' AS aux3;
    PRAGMA main.journal_mode = WAL;
    PRAGMA aux2.journal_mode = WAL;
    PRAGMA aux3.journal_mode = WAL;

    CREATE TABLE main.t1(x,y);
    CREATE TABLE aux2.t2(x,y);
    CREATE TABLE aux3.t3(x,y);

    INSERT INTO t1 VALUES('a', 'b');
    INSERT INTO t2 VALUES('a', 'b');
    INSERT INTO t3 VALUES('a', 'b');
  }
  sqlite3 db2 test.db2 -vfs tvfs

  switch -- $tn {
    1 {
      # EVIDENCE-OF: R-41299-52117 If no error (SQLITE_BUSY or otherwise) is
      # encountered while processing the attached databases, SQLITE_OK is
      # returned.
      do_test 5.$tn.1 {
        lindex [wal_checkpoint_v2 db truncate] 0
      } {0}    ;# 0 -> SQLITE_OK
      do_test 5.$tn.2 {
        list [expr [file size test.db-wal]==0]  \
             [expr [file size test.db2-wal]==0] \
             [expr [file size test.db3-wal]==0]
      } {1 1 1}
    }

    2 {
      # EVIDENCE-OF: R-38578-34175 If an SQLITE_BUSY error is encountered when
      # processing one or more of the attached WAL databases, the operation is
      # still attempted on any remaining attached databases and SQLITE_BUSY is
      # returned at the end.
      db2 eval { BEGIN; INSERT INTO t2 VALUES('d', 'e'); }
      do_test 5.$tn.1 {
        lindex [wal_checkpoint_v2 db truncate] 0
      } {1}    ;# 1 -> SQLITE_BUSY
      do_test 5.$tn.2 {
        list [expr [file size test.db-wal]==0]  \
             [expr [file size test.db2-wal]==0] \
             [expr [file size test.db3-wal]==0]
      } {1 0 1}
      db2 eval ROLLBACK
    }

    3 {
      # EVIDENCE-OF: R-38049-07913 If any other error occurs while processing
      # an attached database, processing is abandoned and the error code is
      # returned to the caller immediately.
      tvfs filter xWrite
      tvfs script inject_ioerr
      proc inject_ioerr {method file args} {
        if {[file tail $file]=="test.db2"} {
          return "SQLITE_IOERR"
        }
        return 0
      }
      do_test 5.$tn.1 {
        list [catch { wal_checkpoint_v2 db truncate } msg] $msg
      } {1 {SQLITE_IOERR - disk I/O error}}
      do_test 5.$tn.2 {
        list [expr [file size test.db-wal]==0]  \
             [expr [file size test.db2-wal]==0] \
             [expr [file size test.db3-wal]==0]
      } {1 0 0}
      tvfs script ""
    }
  }

  db close
  db2 close
}

reset_db
sqlite3 db2 test.db

do_test 6.1 {
  execsql {
    PRAGMA journal_mode = WAL;
    CREATE TABLE t1(a, b);
    INSERT INTO t1 VALUES(1, 2);
  }
  file size test.db-wal
} [wal_file_size 3 1024]

do_test 6.2 {
  db2 eval { BEGIN; SELECT * FROM t1; }
  db  eval { INSERT INTO t1 VALUES(3, 4) }
  file size test.db-wal
} [wal_file_size 4 1024]

#   At this point the log file contains 4 frames. 3 of which it should
#   be possible to checkpoint.
#
# EVIDENCE-OF: R-16642-42503 If pnLog is not NULL, then *pnLog is set to
# the total number of frames in the log file or to -1 if the checkpoint
# could not run because of an error or because the database is not in
# WAL mode.
#
# EVIDENCE-OF: R-10514-25250 If pnCkpt is not NULL,then *pnCkpt is set
# to the total number of checkpointed frames in the log file (including
# any that were already checkpointed before the function was called) or
# to -1 if the checkpoint could not run due to an error or because the
# database is not in WAL mode.
#
do_test 6.4 {
  lrange [wal_checkpoint_v2 db passive] 1 2
} {4 3} 

# EVIDENCE-OF: R-37257-17813 Note that upon successful completion of an
# SQLITE_CHECKPOINT_TRUNCATE, the log file will have been truncated to
# zero bytes and so both *pnLog and *pnCkpt will be set to zero.
#
do_test 6.5 {
  db2 eval COMMIT
  wal_checkpoint_v2 db truncate
} {0 0 0}



finish_test