SQLite

** The file suffix added to the data base filename in order to create the
** lock directory.
*/
#define DOTLOCK_SUFFIX ".lock"

/*
** This routine checks if there is a RESERVED lock held on the specified
** file by this or any other process. If the caller holds a SHARED
** or greater lock when it is called, then it is assumed that no other
** client may hold RESERVED. Or, if the caller holds no lock, then it



** is assumed another client holds RESERVED if the lock-file exists.
*/
static int dotlockCheckReservedLock(sqlite3_file *id, int *pResOut) {


  unixFile *pFile = (unixFile*)id;

  SimulateIOError( return SQLITE_IOERR_CHECKRESERVEDLOCK; );

  if( pFile->eFileLock>=SHARED_LOCK ){
    *pResOut = 0;
  }else{
    *pResOut = osAccess((const char*)pFile->lockingContext, 0)==0;
  }
  OSTRACE(("TEST WR-LOCK %d %d %d (dotlock)\n", pFile->h, 0, *pResOut));

  return SQLITE_OK;
}

/*
** Lock the file with the lock specified by parameter eFileLock - one
** of the following:
**
**     (1) SHARED_LOCK

# 2008 June 28
#
# 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 implements regression tests for SQLite library.  The
# focus of this script is database locks.
#


set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix lock5

# This file is only run if using the unix backend compiled with the
# SQLITE_ENABLE_LOCKING_STYLE macro.
db close
if {[catch {sqlite3 db test.db -vfs unix-none} msg]} {
  finish_test
  return

  db close
  file exists test.db.lock
} {0}

#####################################################################

forcedelete test.db
if {0==[catch {sqlite3 db test.db -vfs unix-flock} msg]} {




do_test lock5-flock.1 {
  sqlite3 db test.db -vfs unix-flock
  execsql {
    CREATE TABLE t1(a, b);
    BEGIN;
    INSERT INTO t1 VALUES(1, 2);

  db close
  catchsql { SELECT * FROM t1 } db2
} {0 {1 2}}

do_test lock5-flock.8 {
  db2 close
} {}

}

#####################################################################

reset_db

do_test lock5-none.1 {
  sqlite3 db test.db -vfs unix-none
  sqlite3 db2 test.db -vfs unix-none
  execsql { PRAGMA mmap_size = 0 } db2
  execsql {
    CREATE TABLE t1(a, b);
    INSERT INTO t1 VALUES(1, 2);
    BEGIN;
    INSERT INTO t1 VALUES(3, 4);
  }
} {}
do_test lock5-none.2 {
  execsql { SELECT * FROM t1 }
} {1 2 3 4}

} {1 2}
do_test lock5-none.5 {
  execsql COMMIT
  execsql {SELECT * FROM t1} db2
} {1 2}

ifcapable memorymanage {
  if {[permutation]!="memsubsys1" && [permutation]!="memsubsys2"} { 
    do_test lock5-none.6 {
      sqlite3_release_memory 1000000
      execsql {SELECT * FROM t1} db2
    } {1 2 3 4}
  }
}

do_test lock5-none.X {
  db close
  db2 close
} {}

ifcapable lock_proxy_pragmas {
  set env(SQLITE_FORCE_PROXY_LOCKING) $::using_proxy
}

#####################################################################
reset_db
if {[permutation]!="inmemory_journal"} {
  
  # 1. Create a large database using the unix-dotfile VFS
  # 2. Write a large transaction to the db, so that the cache spills, but do
  #    not commit it.
  # 3. Make a copy of the database files on disk.
  # 4. Try to read from the copy using unix-dotfile VFS. This fails because
  #    the dotfile still exists, so SQLite things the database is locked.
  # 5. Remove the dotfile.
  # 6. Try to read the db again. This time, the old transaction is rolled
  #    back and the read permitted.
  #
  do_test 2.dotfile.1 {
    sqlite3 db test.db -vfs unix-dotfile
    execsql {
      PRAGMA cache_size = 10;
      CREATE TABLE t1(x, y, z);
      CREATE INDEX t1x ON t1(x);
      WITH s(i) AS (
        SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<1000
      )
      INSERT INTO t1 SELECT hex(randomblob(20)), hex(randomblob(500)), i FROM s;
    }
  } {}
  
  do_execsql_test 2.dotfile.2 {
    BEGIN;
      UPDATE t1 SET z=z+1, x=hex(randomblob(20));
  }
  
  do_test 2.dotfile.3 {
    list                            \
      [file exists test.db]         \
      [file exists test.db-journal] \
      [file exists test.db.lock]
  } {1 1 1}
  
  do_test 2.dotfile.4 {
    forcecopy test.db test.db2
    forcecopy test.db-journal test.db2-journal
    file mkdir test.db2.lock
  
    sqlite3 db2 test.db2 -vfs unix-dotfile
    catchsql {
      SELECT count(*) FROM t1;
    } db2
  } {1 {database is locked}}
  
  do_test 2.dotfile.5 {
    file delete test.db2.lock
    execsql {
      PRAGMA integrity_check
    } db2
  } {ok}
  
  db2 close
  
  do_test 2.dotfile.6 {
    forcecopy test.db test.db2
    forcecopy test.db-journal test.db2-journal
  
    sqlite3 db2 file:test.db2?nolock=1 -vfs unix-dotfile -uri 1
    catchsql {
      SELECT count(*) FROM t1;
    } db2
  } {0 1000}
}

finish_test