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    1: # 2009 August 20
    2: #
    3: # The author disclaims copyright to this source code.  In place of
    4: # a legal notice, here is a blessing:
    5: #
    6: #    May you do good and not evil.
    7: #    May you find forgiveness for yourself and forgive others.
    8: #    May you share freely, never taking more than you give.
    9: #
   10: #***********************************************************************
   11: # This file implements regression tests for SQLite library.
   12: #
   13: # This file implements tests to verify that ticket #4018 has been
   14: # fixed.  
   15: #
   16: 
   17: set testdir [file dirname $argv0]
   18: source $testdir/tester.tcl
   19: 
   20: proc testsql {sql} {
   21:   set fd [open tf_main.tcl w]
   22:   puts $fd [subst -nocommands {
   23:     sqlite3_test_control_pending_byte 0x0010000
   24:     sqlite3 db test.db
   25:     set rc [catch { db eval {$sql} } msg]
   26:     puts -nonewline "[set rc] {[set msg]}"
   27:     flush stdout
   28:     exit
   29:   }]
   30:   close $fd
   31:   set fd [open "| [info nameofexec] ./tf_main.tcl" r] 
   32:   set res [read $fd]
   33:   close $fd
   34:   return $res
   35: }
   36: 
   37: do_test tkt4018-1.1 {
   38:   execsql {
   39:     CREATE TABLE t1(a, b);
   40:     BEGIN;
   41:     SELECT * FROM t1;
   42:   }
   43: } {}
   44: 
   45: # The database is locked by connection [db]. Open and close a second
   46: # connection to test.db 10000 times. If file-descriptors are not being
   47: # reused, then the process will quickly exceed its maximum number of
   48: # file descriptors (1024 by default on linux).
   49: do_test tkt4018-1.2 {
   50:   for {set i 0} {$i < 10000} {incr i} {
   51:     sqlite3 db2 test.db
   52:     db2 close
   53:   }
   54: } {}
   55: 
   56: # Now check that connection [db] is still holding a SHARED lock by
   57: # having a second process try to write the db.
   58: do_test tkt4018-1.3 {
   59:   testsql {INSERT INTO t1 VALUES(3, 4)}
   60: } {1 {database is locked}}
   61: 
   62: # Sanity checking. Have [db] release the lock and then retry the
   63: # INSERT from the previous test case.
   64: do_test tkt4018-1.4 {
   65:   db eval COMMIT
   66:   testsql {INSERT INTO t1 VALUES(3, 4)}
   67: } {0 {}}
   68: 
   69: # Check that reusing a file descriptor cannot change a read-only 
   70: # connection into a read-write connection.
   71: do_test tkt4018-2.1 {
   72:   sqlite3 db2 test.db
   73:   execsql {INSERT INTO t1 VALUES(1, 2)} db2
   74: } {}
   75: do_test tkt4018-2.2 {
   76:   execsql {
   77:     BEGIN;
   78:     SELECT * FROM t1 ORDER BY a;
   79:   }
   80: } {1 2 3 4}
   81: do_test tkt4018-2.3 {
   82:   db2 close
   83:   sqlite3 db2 test.db -readonly 1
   84:   execsql COMMIT
   85:   catchsql {INSERT INTO t1 VALUES(5, 6)} db2
   86: } {1 {attempt to write a readonly database}}
   87: db2 close
   88: 
   89: finish_test