--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/persistentstorage/sqlite3api/TEST/TclScript/ioerr5.test Fri Jan 22 11:06:30 2010 +0200
@@ -0,0 +1,221 @@
+# 2008 May 12
+#
+# 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 tests that if sqlite3_release_memory() is called to reclaim
+# memory from a pager that is in the error-state, SQLite does not
+# incorrectly write dirty pages out to the database (not safe to do
+# once the pager is in error state).
+#
+# $Id: ioerr5.test,v 1.5 2008/08/28 18:35:34 danielk1977 Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+ifcapable !memorymanage||!shared_cache {
+ finish_test
+ return
+}
+
+db close
+
+set ::enable_shared_cache [sqlite3_enable_shared_cache 1]
+set ::soft_limit [sqlite3_soft_heap_limit 1048576]
+
+# This procedure prepares, steps and finalizes an SQL statement via the
+# UTF-16 APIs. The text representation of an SQLite error code is returned
+# ("SQLITE_OK", "SQLITE_IOERR" etc.). The actual results returned by the
+# SQL statement, if it is a SELECT, are not available.
+#
+# This can be useful for testing because it forces SQLite to make an extra
+# call to sqlite3_malloc() when translating from the supplied UTF-16 to
+# the UTF-8 encoding used internally.
+#
+proc dosql16 {zSql {db db}} {
+ set sql [encoding convertto unicode $zSql]
+ append sql "\00\00"
+ set stmt [sqlite3_prepare16 $db $sql -1 {}]
+ sqlite3_step $stmt
+ set rc [sqlite3_finalize $stmt]
+}
+
+proc compilesql16 {zSql {db db}} {
+ set sql [encoding convertto unicode $zSql]
+ append sql "\00\00"
+ set stmt [sqlite3_prepare16 $db $sql -1 {}]
+ set rc [sqlite3_finalize $stmt]
+}
+
+# Open two database connections (handle db and db2) to database "test.db".
+#
+proc opendatabases {} {
+ catch {db close}
+ catch {db2 close}
+ sqlite3 db test.db
+ sqlite3 db2 test.db
+ db2 cache size 0
+ db cache size 0
+ execsql {
+ pragma page_size=512;
+ pragma auto_vacuum=2;
+ pragma cache_size=16;
+ }
+}
+
+# Open two database connections and create a single table in the db.
+#
+do_test ioerr5-1.0 {
+ opendatabases
+ execsql { CREATE TABLE A(Id INTEGER, Name TEXT) }
+} {}
+
+foreach locking_mode {normal exclusive} {
+ set nPage 2
+ for {set iFail 1} {$iFail<200} {incr iFail} {
+ sqlite3_soft_heap_limit 1048576
+ opendatabases
+ execsql { pragma locking_mode=exclusive }
+ set nRow [db one {SELECT count(*) FROM a}]
+
+ # Dirty (at least) one of the pages in the cache.
+ do_test ioerr5-1.$locking_mode-$iFail.1 {
+ execsql {
+ BEGIN EXCLUSIVE;
+ INSERT INTO a VALUES(1, 'ABCDEFGHIJKLMNOP');
+ }
+ } {}
+
+ # Now try to commit the transaction. Cause an IO error to occur
+ # within this operation, which moves the pager into the error state.
+ #
+ set ::sqlite_io_error_persist 1
+ set ::sqlite_io_error_pending $iFail
+ do_test ioerr5-1.$locking_mode-$iFail.2 {
+ set rc [catchsql {COMMIT}]
+ list
+ } {}
+ set ::sqlite_io_error_hit 0
+ set ::sqlite_io_error_persist 0
+ set ::sqlite_io_error_pending 0
+
+ # Read the contents of the database file into a Tcl variable.
+ #
+ set fd [open test.db]
+ fconfigure $fd -translation binary -encoding binary
+ set zDatabase [read $fd]
+ close $fd
+
+ # Set a very low soft-limit and then try to compile an SQL statement
+ # from UTF-16 text. To do this, SQLite will need to reclaim memory
+ # from the pager that is in error state. Including that associated
+ # with the dirty page.
+ #
+ do_test ioerr5-1.$locking_mode-$iFail.3 {
+ set bt [btree_from_db db]
+ sqlite3_soft_heap_limit 1024
+ compilesql16 "SELECT 10"
+ array set stats [btree_pager_stats $bt]
+
+ # If the pager made it all the way to PAGER_SYNCED state, then
+ # both in-memory pages are clean. Following the calls to
+ # release_memory() that were made as part of the [compilesql16]
+ # above, there will be zero pages left in the cache.
+ #
+ # If the pager did not make it as far as PAGER_SYNCED, the two
+ # in memory pages are still dirty. So there will be 2 pages left
+ # in the cache following the release_memory() calls.
+ #
+ if {$stats(state)==5} {
+ set nPage 0
+ }
+ expr {$stats(page)==$nPage}
+ } {1}
+
+ # Ensure that nothing was written to the database while reclaiming
+ # memory from the pager in error state.
+ #
+ do_test ioerr5-1.$locking_mode-$iFail.4 {
+ set fd [open test.db]
+ fconfigure $fd -translation binary -encoding binary
+ set zDatabase2 [read $fd]
+ close $fd
+ expr {$zDatabase eq $zDatabase2}
+ } {1}
+
+ if {$rc eq [list 0 {}]} {
+ do_test ioerr5.1-$locking_mode-$iFail.3 {
+ execsql { SELECT count(*) FROM a }
+ } [expr $nRow+1]
+ break
+ }
+ }
+}
+
+# Make sure this test script doesn't leave any files open.
+#
+do_test ioerr5-1.X {
+ catch { db close }
+ catch { db2 close }
+ set sqlite_open_file_count
+} 0
+
+do_test ioerr5-2.0 {
+ sqlite3 db test.db
+ execsql { CREATE INDEX i1 ON a(id, name); }
+} {}
+
+foreach locking_mode {exclusive normal} {
+ for {set iFail 1} {$iFail<200} {incr iFail} {
+ sqlite3_soft_heap_limit 1048576
+ opendatabases
+ execsql { pragma locking_mode=exclusive }
+ set nRow [db one {SELECT count(*) FROM a}]
+
+ do_test ioerr5-2.$locking_mode-$iFail.1 {
+ execsql {
+ BEGIN EXCLUSIVE;
+ INSERT INTO a VALUES(1, 'ABCDEFGHIJKLMNOP');
+ }
+ } {}
+
+ set ::sqlite_io_error_persist 1
+ set ::sqlite_io_error_pending $iFail
+
+ sqlite3_release_memory 10000
+
+ set error_hit $::sqlite_io_error_hit
+ set ::sqlite_io_error_hit 0
+ set ::sqlite_io_error_persist 0
+ set ::sqlite_io_error_pending 0
+ if {$error_hit} {
+ do_test ioerr5-2.$locking_mode-$iFail.3a {
+ catchsql COMMIT
+ } {1 {disk I/O error}}
+ } else {
+ do_test ioerr5-2.$locking_mode-$iFail.3b {
+ execsql COMMIT
+ } {}
+ break
+ }
+ }
+}
+
+# Make sure this test script doesn't leave any files open.
+#
+do_test ioerr5-2.X {
+ catch { db close }
+ catch { db2 close }
+ set sqlite_open_file_count
+} 0
+
+sqlite3_enable_shared_cache $::enable_shared_cache
+sqlite3_soft_heap_limit $::soft_limit
+
+finish_test