summaryrefslogtreecommitdiffstats
path: root/tests/iogt.test
blob: a737634e3ecf130ac915ce8d8be273a83315c363 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
# -*- tcl -*-
# Commands covered:  transform, and stacking in general
#
# This file contains a collection of tests for Giot
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# 
# Copyright (c) 2000 Ajuba Solutions.
# Copyright (c) 2000 Andreas Kupries.
# All rights reserved.
# 
# RCS: @(#) $Id: iogt.test,v 1.3 2001/12/17 22:55:51 andreas_kupries Exp $


if {[lsearch [namespace children] ::tcltest] == -1} {
    package require tcltest
    namespace import -force ::tcltest::*
}

if {[info commands testchannel] == ""} {
    puts "Skipping io tests. This application does not seem to have the"
    puts "testchannel command that is needed to run these tests."
    return
}

::tcltest::saveState

#::tcltest::makeFile contents name

::tcltest::makeFile {abcdefghijklmnopqrstuvwxyz0123456789,./?><;'\|":[]\}\{`~!@#$%^&*()_+-=} dummy

# " capture coloring of quotes

::tcltest::makeFile {} dummyout

::tcltest::makeFile {
#!/usr/local/bin/tclsh
# -*- tcl -*-
# echo server
#
# arguments, options: port to listen on for connections.
#                     delay till echo of first block
#                     delay between blocks
#                     blocksize ...

set port   [lindex $argv 0]
set fdelay [lindex $argv 1]
set idelay [lindex $argv 2]
set bsizes [lrange $argv 3 end]
set c      0

proc newconn {sock rhost rport} {
    global c fdelay
    incr   c

    #puts stdout "C $sock $rhost $rport / $fdelay" ; flush stdout

    upvar #0 c$c conn
    set conn(after) {}
    set conn(state) 0
    set conn(size)  0
    set conn(data)  ""
    set conn(delay) $fdelay

    fileevent  $sock readable [list echoGet $c $sock]
    fconfigure $sock -translation binary -buffering none -blocking 0
}

proc echoGet {c sock} {
    global fdelay
    upvar #0 c$c conn

    if {[eof $sock]} {
	# one-shot echo
	exit
    }

    append conn(data) [read $sock]

    #puts stdout "G $c $sock $conn(data) <<$conn(data)>>" ; flush stdout

    if {$conn(after) == {}} {
	set conn(after) [after $conn(delay) [list echoPut $c $sock]]
    }
}

proc echoPut {c sock} {
    global idelay fdelay bsizes
    upvar #0 c$c conn

    if {[string length $conn(data)] == 0} {
	#puts stdout "C $c $sock" ; flush stdout
	# auto terminate
	close $sock
	exit
	#set conn(delay) $fdelay
	return
    }


    set conn(delay) $idelay

    set n [lindex $bsizes $conn(size)]

    #puts stdout "P $c $sock $n >>" ; flush stdout

    #puts __________________________________________
    #parray conn
    #puts n=<$n>


    if {[string length $conn(data)] >= $n} {
	puts -nonewline $sock [string range $conn(data) 0 $n]
	set conn(data) [string range $conn(data) [incr n] end]
    }

    incr conn(size)
    if {$conn(size) >= [llength $bsizes]} {
	set conn(size) [expr {[llength $bsizes]-1}]
    }

    set conn(after) [after $conn(delay) [list echoPut $c $sock]]
}

#fileevent stdin readable {exit ;#cut}

# main
socket -server newconn $port
vwait forever
} __echo_srv__.tcl


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

proc fevent {fdelay idelay blocks script data} {
    # start and initialize an echo server, prepare data
    # transmission, then hand over to the test script.
    # this has to start real transmission via 'flush'.
    # The server is stopped after completion of the test.

    # fixed port, not so good. lets hope for the best, for now.
    set port 4000

    eval exec tclsh __echo_srv__.tcl \
	    $port $fdelay $idelay $blocks >@stdout &

    after 500

    #puts stdout "> $port" ; flush stdout

    set         sk [socket localhost $port]
    fconfigure $sk           \
	    -blocking   0    \
	    -buffering  full \
	    -buffersize [expr {10+[llength $data]}]

    puts -nonewline $sk $data

    # The channel is prepared to go off.

    #puts stdout ">>>>>" ; flush stdout

    uplevel #0 set sock $sk
    set res [uplevel #0 $script]

    catch {close $sk}
    return $res
}

# --------------------------------------------------------------
# utility transformations ...

proc id {op data} {
    switch -- $op {
	create/write -
	create/read  -
	delete/write -
	delete/read  -
	clear_read   {;#ignore}
	flush/write -
	flush/read  -
	write       -
	read        {
	    return $data
	}
	query/maxRead {return -1}
    }
}

proc id_optrail {var op data} {
    upvar #0 $var trail

    lappend trail $op

    switch -- $op {
	create/write	-	create/read	-
	delete/write	-	delete/read	-
	flush/read	-
	clear/read	{ #ignore }
	flush/write	-
	write		-
	read		{
	    return $data
	}
	query/maxRead	{
	    return -1
	}
	default		{
	    lappend trail "error $op"
	    error $op
	}
    }
}


proc id_fulltrail {var op data} {
    upvar #0 $var trail

    #puts stdout ">> $var $op $data" ; flush stdout

    switch -- $op {
	create/write -	create/read  -
	delete/write -	delete/read  -
	clear_read   {
	    set res *ignored*
	}
	flush/write -	flush/read  -
	write       -
	read        {
	    set res $data
	}
	query/maxRead {
	    set res -1
	}
    }

    #catch {puts stdout "\t>* $res" ; flush stdout}
    #catch {puts stdout "x$res"} msg

    lappend trail [list $op $data $res]
    return $res
}

proc counter {var op data} {
    upvar #0 $var n

    switch -- $op {
	create/write -	create/read  -
	delete/write -	delete/read  -
	clear_read   {;#ignore}
	flush/write  -	flush/read   {return {}}
	write {
	    return $data
	}
	read  {
	    if {$n > 0} {
		incr n -[string length $data]
		if {$n < 0} {
		    set n 0
		}
	    }
	    return $data
	}
	query/maxRead {
	    return $n
	}
    }
}


proc counter_audit {var vtrail op data} {
    upvar #0 $var n $vtrail trail

    switch -- $op {
	create/write -	create/read  -
	delete/write -	delete/read  -
	clear_read   {
	    set res {}
	}
	flush/write  -	flush/read   {
	    set res {}
	}
	write {
	    set res $data
	}
	read  {
	    if {$n > 0} {
		incr n -[string length $data]
		if {$n < 0} {
		    set n 0
		}
	    }
	    set res $data
	}
	query/maxRead {
	    set res $n
	}
    }

    lappend trail [list counter:$op $data $res]
    return $res
}


proc rblocks {var vtrail n op data} {
    upvar #0 $var buf $vtrail trail

    set res {}

    switch -- $op {
	create/write -	create/read  -
	delete/write -	delete/read  -
	clear_read   {
	    set buf {}
	}
	flush/write {
	}
	flush/read  {
	    set res $buf
	    set buf {}
	}
	write       {
	    set data
	}
	read        {
	    append buf $data

	    set b [expr {$n * ([string length $buf] / $n)}]

	    append op " $n [string length $buf] :- $b"

	    set res [string range $buf 0 [incr b -1]]
	    set buf [string range $buf [incr b] end]
	    #return $res
	}
	query/maxRead {
	    set res -1
	}
    }

    lappend trail [list rblock | $op $data $res | $buf]
    return $res
}


# --------------------------------------------------------------
# ... and convenience procedures to stack them

proc identity {-attach channel} {
    testchannel transform $channel -command id
}

proc audit_ops {var -attach channel} {
    testchannel transform $channel -command [list id_optrail $var]
}

proc audit_flow {var -attach channel} {
    testchannel transform $channel -command [list id_fulltrail $var]
}

proc stopafter {var n -attach channel} {
    upvar #0 $var vn
    set vn $n
    testchannel transform $channel -command [list counter $var]
}

proc stopafter_audit {var trail n -attach channel} {
    upvar #0 $var vn
    set vn $n
    testchannel transform $channel -command [list counter_audit $var $trail]
}

proc rblocks_t {var trail n -attach channel} {
    testchannel transform $channel -command [list rblocks $var $trail $n]
}

# --------------------------------------------------------------
# serialize an array, with keys in sorted order.

proc array_sget {v} {
    upvar $v a

    set res [list]
    foreach n [lsort [array names a]] {
	lappend res $n $a($n)
    }
    set res
}

proc asort {alist} {
    # sort a list of key/value pairs by key, removes duplicates too.

    array set  a $alist
    array_sget a
}

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


test iogt-1.1 {stack/unstack} {
    set fh [open dummy r]
    identity -attach $fh
    testchannel unstack $fh
    close   $fh
} {}

test iogt-1.2 {stack/close} {
    set fh [open dummy r]
    identity -attach $fh
    close   $fh
} {}

test iogt-1.3 {stack/unstack, configuration, options} {
    set fh [open dummy r]
    set ca [asort [fconfigure $fh]]
    identity -attach $fh
    set cb [asort [fconfigure $fh]]
    testchannel unstack $fh
    set cc [asort [fconfigure $fh]]
    close $fh

    # With this system none of the buffering, translation and
    # encoding option may change their values with channels
    # stacked upon each other or not.

    # cb == ca == cc

    list [string equal $ca $cb] [string equal $cb $cc] [string equal $ca $cc]
} {1 1 1}

test iogt-1.4 {stack/unstack, configuration} {
    set fh [open dummy r]
    set ca [asort [fconfigure $fh]]
    identity -attach $fh
    fconfigure $fh \
	    -buffering   line \
	    -translation cr   \
	    -encoding    shiftjis
    testchannel unstack $fh
    set cc [asort [fconfigure $fh]]

    set res [list \
	    [string equal $ca $cc]   \
	    [fconfigure $fh -buffering]  \
	    [fconfigure $fh -translation] \
	    [fconfigure $fh -encoding]    \
	    ]

    close $fh
    set res
} {0 line cr shiftjis}

test iogt-2.0 {basic I/O going through transform} {
    set fin  [open dummy    r]
    set fout [open dummyout w]

    identity -attach $fin
    identity -attach $fout

    fcopy $fin $fout

    close $fin
    close $fout

    set fin  [open dummy    r]
    set fout [open dummyout r]

    set res     [string equal [set in [read $fin]] [set out [read $fout]]]
    lappend res [string length $in] [string length $out]

    close $fin
    close $fout

    set res
} {1 71 71}


test iogt-2.1 {basic I/O, operation trail} {unixOnly} {
    set fin  [open dummy    r]
    set fout [open dummyout w]

    set ain [list] ; set aout [list]
    audit_ops ain  -attach $fin
    audit_ops aout -attach $fout

    fconfigure $fin  -buffersize 10
    fconfigure $fout -buffersize 5

    fcopy $fin $fout

    close $fin
    close $fout

    set res "[join $ain \n]\n--------\n[join $aout \n]"
} {create/read
query/maxRead
read
query/maxRead
read
query/maxRead
read
query/maxRead
read
query/maxRead
read
query/maxRead
read
query/maxRead
read
query/maxRead
read
query/maxRead
flush/read
delete/read
--------
create/write
write
write
write
write
write
write
write
write
flush/write
delete/write}

test iogt-2.2 {basic I/O, data trail} {unixOnly} {
    set fin  [open dummy    r]
    set fout [open dummyout w]

    set ain [list] ; set aout [list]
    audit_flow ain  -attach $fin
    audit_flow aout -attach $fout

    fconfigure $fin  -buffersize 10
    fconfigure $fout -buffersize 5

    fcopy $fin $fout

    close $fin
    close $fout

    set res "[join $ain \n]\n--------\n[join $aout \n]"
} {create/read {} *ignored*
query/maxRead {} -1
read abcdefghij abcdefghij
query/maxRead {} -1
read klmnopqrst klmnopqrst
query/maxRead {} -1
read uvwxyz0123 uvwxyz0123
query/maxRead {} -1
read 456789,./? 456789,./?
query/maxRead {} -1
read {><;'\|":[]} {><;'\|":[]}
query/maxRead {} -1
read {\}\{`~!@#$} {\}\{`~!@#$}
query/maxRead {} -1
read %^&*()_+-= %^&*()_+-=
query/maxRead {} -1
read {
} {
}
query/maxRead {} -1
flush/read {} {}
delete/read {} *ignored*
--------
create/write {} *ignored*
write abcdefghij abcdefghij
write klmnopqrst klmnopqrst
write uvwxyz0123 uvwxyz0123
write 456789,./? 456789,./?
write {><;'\|":[]} {><;'\|":[]}
write {\}\{`~!@#$} {\}\{`~!@#$}
write %^&*()_+-= %^&*()_+-=
write {
} {
}
flush/write {} {}
delete/write {} *ignored*}


test iogt-2.3 {basic I/O, mixed trail} {unixOnly} {
    set fin  [open dummy    r]
    set fout [open dummyout w]

    set trail [list]
    audit_flow trail -attach $fin
    audit_flow trail -attach $fout

    fconfigure $fin  -buffersize 20
    fconfigure $fout -buffersize 10

    fcopy $fin $fout

    close $fin
    close $fout

    join $trail \n
} {create/read {} *ignored*
create/write {} *ignored*
query/maxRead {} -1
read abcdefghijklmnopqrst abcdefghijklmnopqrst
write abcdefghij abcdefghij
write klmnopqrst klmnopqrst
query/maxRead {} -1
read uvwxyz0123456789,./? uvwxyz0123456789,./?
write uvwxyz0123 uvwxyz0123
write 456789,./? 456789,./?
query/maxRead {} -1
read {><;'\|":[]\}\{`~!@#$} {><;'\|":[]\}\{`~!@#$}
write {><;'\|":[]} {><;'\|":[]}
write {\}\{`~!@#$} {\}\{`~!@#$}
query/maxRead {} -1
read {%^&*()_+-=
} {%^&*()_+-=
}
query/maxRead {} -1
flush/read {} {}
write %^&*()_+-= %^&*()_+-=
write {
} {
}
delete/read {} *ignored*
flush/write {} {}
delete/write {} *ignored*}


test iogt-3.0 {Tcl_Channel valid after stack/unstack, fevent handling} \
	{unknownFailure} {
    # This test to check the validity of aquired Tcl_Channel references is
    # not possible because even a backgrounded fcopy will immediately start
    # to copy data, without waiting for the event loop. This is done only in
    # case of an underflow on the read size!. So stacking transforms after the
    # fcopy will miss information, or are not used at all.
    #
    # I was able to circumvent this by using the echo.tcl server with a big
    # delay, causing the fcopy to underflow immediately.

    proc DoneCopy {n {err {}}} {
	global copy ; set copy 1
    }

    set fin  [open dummy    r]

    fevent 1000 500 {20 20 20 10 1 1} {
	close $fin

	set          fout [open dummyout w]

	flush $sock ; # now, or fcopy will error us out
	# But the 1 second delay should be enough to
	# initialize everything else here.

	fcopy $sock $fout -command DoneCopy

	# transform after fcopy got its handles !
	# They should be still valid for fcopy.

	set trail [list]
	audit_ops trail -attach $fout

	vwait copy
    } [read $fin] ; # {}

    close $fout

    rename DoneCopy {}

    # Check result of copy.

    set fin  [open dummy    r]
    set fout [open dummyout r]

    set res [string equal [read $fin] [read $fout]]

    close $fin
    close $fout

    list $res $trail
} {1 {create/write create/read write flush/write flush/read delete/write delete/read}}


test iogt-4.0 {fileevent readable, after transform} {unknownFailure} {
    set fin  [open dummy    r]
    set data [read $fin]
    close $fin

    set trail [list]
    set got   [list]

    proc Done {args} {
	global stop
	set    stop 1
    }

    proc Get {sock} {
	global trail got
	if {[eof $sock]} {
	    Done
	    lappend trail "xxxxxxxxxxxxx"
	    close $sock
	    return
	}
	lappend trail "vvvvvvvvvvvvv"
	lappend trail "\tgot: [lappend got "\[\[[read $sock]\]\]"]"
	lappend trail "============="
	#puts stdout $__ ; flush stdout
	#read $sock
    }

    fevent 1000 500 {20 20 20 10 1} {
	audit_flow trail   -attach $sock
	rblocks_t  rbuf trail 23 -attach $sock

	fileevent $sock readable [list Get $sock]

	flush $sock ; # now, or fcopy will error us out
	# But the 1 second delay should be enough to
	# initialize everything else here.

	vwait stop
    } $data


    rename Done {}
    rename Get {}

    join [list [join $got \n] ~~~~~~~~ [join $trail \n]] \n
} {[[]]
[[abcdefghijklmnopqrstuvw]]
[[xyz0123456789,./?><;'\|]]
[[]]
[[]]
[[":[]\}\{`~!@#$%^&*()]]
[[]]
~~~~~~~~
create/write {} *ignored*
create/read {} *ignored*
rblock | create/write {} {} | {}
rblock | create/read {} {} | {}
vvvvvvvvvvvvv
rblock | query/maxRead {} -1 | {}
query/maxRead {} -1
read abcdefghijklmnopqrstu abcdefghijklmnopqrstu
query/maxRead {} -1
rblock | {read 23 21 :- 0} abcdefghijklmnopqrstu {} | abcdefghijklmnopqrstu
rblock | query/maxRead {} -1 | abcdefghijklmnopqrstu
query/maxRead {} -1
	got: {[[]]}
=============
vvvvvvvvvvvvv
rblock | query/maxRead {} -1 | abcdefghijklmnopqrstu
query/maxRead {} -1
read vwxyz0123456789,./?>< vwxyz0123456789,./?><
query/maxRead {} -1
rblock | {read 23 42 :- 23} vwxyz0123456789,./?>< abcdefghijklmnopqrstuvw | xyz0123456789,./?><
rblock | query/maxRead {} -1 | xyz0123456789,./?><
query/maxRead {} -1
	got: {[[]]} {[[abcdefghijklmnopqrstuvw]]}
=============
vvvvvvvvvvvvv
rblock | query/maxRead {} -1 | xyz0123456789,./?><
query/maxRead {} -1
read {;'\|":[]\}\{`~!@#$%^&} {;'\|":[]\}\{`~!@#$%^&}
query/maxRead {} -1
rblock | {read 23 40 :- 23} {;'\|":[]\}\{`~!@#$%^&} {xyz0123456789,./?><;'\|} | {":[]\}\{`~!@#$%^&}
rblock | query/maxRead {} -1 | {":[]\}\{`~!@#$%^&}
query/maxRead {} -1
	got: {[[]]} {[[abcdefghijklmnopqrstuvw]]} {[[xyz0123456789,./?><;'\|]]}
=============
vvvvvvvvvvvvv
rblock | query/maxRead {} -1 | {":[]\}\{`~!@#$%^&}
query/maxRead {} -1
read *( *(
query/maxRead {} -1
rblock | {read 23 19 :- 0} *( {} | {":[]\}\{`~!@#$%^&*(}
rblock | query/maxRead {} -1 | {":[]\}\{`~!@#$%^&*(}
query/maxRead {} -1
	got: {[[]]} {[[abcdefghijklmnopqrstuvw]]} {[[xyz0123456789,./?><;'\|]]} {[[]]}
=============
vvvvvvvvvvvvv
rblock | query/maxRead {} -1 | {":[]\}\{`~!@#$%^&*(}
query/maxRead {} -1
read ) )
query/maxRead {} -1
rblock | {read 23 20 :- 0} ) {} | {":[]\}\{`~!@#$%^&*()}
rblock | query/maxRead {} -1 | {":[]\}\{`~!@#$%^&*()}
query/maxRead {} -1
	got: {[[]]} {[[abcdefghijklmnopqrstuvw]]} {[[xyz0123456789,./?><;'\|]]} {[[]]} {[[]]}
=============
vvvvvvvvvvvvv
rblock | query/maxRead {} -1 | {":[]\}\{`~!@#$%^&*()}
query/maxRead {} -1
flush/read {} {}
rblock | flush/read {} {":[]\}\{`~!@#$%^&*()} | {}
rblock | query/maxRead {} -1 | {}
query/maxRead {} -1
	got: {[[]]} {[[abcdefghijklmnopqrstuvw]]} {[[xyz0123456789,./?><;'\|]]} {[[]]} {[[]]} {[[":[]\}\{`~!@#$%^&*()]]}
=============
vvvvvvvvvvvvv
rblock | query/maxRead {} -1 | {}
query/maxRead {} -1
	got: {[[]]} {[[abcdefghijklmnopqrstuvw]]} {[[xyz0123456789,./?><;'\|]]} {[[]]} {[[]]} {[[":[]\}\{`~!@#$%^&*()]]} {[[]]}
xxxxxxxxxxxxx
rblock | flush/write {} {} | {}
rblock | delete/write {} {} | {}
rblock | delete/read {} {} | {}
flush/write {} {}
delete/write {} *ignored*
delete/read {} *ignored*}  ; # catch unescaped quote "


test iogt-5.0 {EOF simulation} {unknownFailure} {
    set fin  [open dummy    r]
    set fout [open dummyout w]

    set trail [list]

    audit_flow trail -attach $fin
    stopafter_audit d trail 20 -attach   $fin
    audit_flow trail -attach $fout

    fconfigure $fin  -buffersize 20
    fconfigure $fout -buffersize 10

    fcopy   $fin $fout
    testchannel unstack $fin

    # now copy the rest in the channel
    lappend trail {**after unstack**}

    fcopy $fin $fout

    close $fin
    close $fout

    join $trail \n
} {create/read {} *ignored*
counter:create/read {} {}
create/write {} *ignored*
counter:query/maxRead {} 20
query/maxRead {} -1
read {abcdefghijklmnopqrstuvwxyz0123456789,./?><;'\|":[]\}\{`~!@#$%^&*()_+-=
} {abcdefghijklmnopqrstuvwxyz0123456789,./?><;'\|":[]\}\{`~!@#$%^&*()_+-=
}
query/maxRead {} -1
flush/read {} {}
counter:read abcdefghijklmnopqrst abcdefghijklmnopqrst
write abcdefghij abcdefghij
write klmnopqrst klmnopqrst
counter:query/maxRead {} 0
counter:flush/read {} {}
counter:delete/read {} {}
**after unstack**
query/maxRead {} -1
write uvwxyz0123 uvwxyz0123
write 456789,./? 456789,./?
write {><;'\|":[]} {><;'\|":[]}
write {\}\{`~!@#$} {\}\{`~!@#$}
write %^&*()_+-= %^&*()_+-=
write {
} {
}
query/maxRead {} -1
delete/read {} *ignored*
flush/write {} {}
delete/write {} *ignored*}





proc constX {op data} {
    # replace anything coming in with a same-length string of x'es.
    switch -- $op {
	create/write -	create/read  -
	delete/write -	delete/read  -
	clear_read   {;#ignore}
	flush/write -	flush/read  -
	write       -
	read        {
	    return [string repeat x [string length $data]]
	}
	query/maxRead {return -1}
    }
}

proc constx {-attach channel} {
    testchannel transform $channel -command constX
}

test iogt-6.0 {Push back} {
    set f [open dummy r]

    # contents of dummy = "abcdefghi..."
    read $f 3 ; # skip behind "abc"

    constx -attach $f

    # expect to get "xxx" from the transform because
    # of unread "def" input to transform which returns "xxx".
    #
    # Actually the IO layer pre-read the whole file and will
    # read "def" directly from the buffer without bothering
    # to consult the newly stacked transformation. This is
    # wrong.

    set res [read $f 3]
    close $f
    set res
} {xxx}

test iogt-6.1 {Push back and up} {knownBug} {
    set f [open dummy r]

    # contents of dummy = "abcdefghi..."
    read $f 3 ; # skip behind "abc"

    constx -attach $f
    set res [read $f 3]

    testchannel unstack $f
    append res [read $f 3]
    close $f
    set res
} {xxxghi}


# cleanup
foreach file [list dummy dummyout __echo_srv__.tcl] {
    ::tcltest::removeFile $file
}
::tcltest::restoreState
::tcltest::cleanupTests
return