# -*- tcl -*-
# Commands covered: open, close, gets, read, puts, seek, tell, eof, flush,
#		    fblocked, fconfigure, open, channel, fcopy
#
# This file contains a collection of tests for one or more of the Tcl
# built-in commands.  Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# Copyright © 1991-1994 The Regents of the University of California.
# Copyright © 1994-1996 Sun Microsystems, Inc.
# Copyright © 1998-1999 Scriptics Corporation.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.

if {"::tcltest" ni [namespace children]} {
    package require tcltest 2.5
    namespace import -force ::tcltest::*
}

::tcltest::loadTestedCommands
catch [list package require -exact Tcltest [info patchlevel]]

package require tcltests

# Custom constraints used in this file
testConstraint testchannel	[llength [info commands testchannel]]

#----------------------------------------------------------------------

test iocmd-1.1 {puts command} {
   list [catch {puts} msg] $msg
} {1 {wrong # args: should be "puts ?-nonewline? ?channelId? string"}}
test iocmd-1.2 {puts command} {
   list [catch {puts a b c d e f g} msg] $msg
} {1 {wrong # args: should be "puts ?-nonewline? ?channelId? string"}}
test iocmd-1.3 {puts command} {
   list [catch {puts froboz -nonewline kablooie} msg] $msg
} {1 {wrong # args: should be "puts ?-nonewline? ?channelId? string"}}
test iocmd-1.4 {puts command} {
   list [catch {puts froboz hello} msg] $msg
} {1 {can not find channel named "froboz"}}
test iocmd-1.5 {puts command} {
   list [catch {puts stdin hello} msg] $msg
} {1 {channel "stdin" wasn't opened for writing}}

set path(test1) [makeFile {} test1]

test iocmd-1.6 {puts command} {
    set f [open $path(test1) w]
    fconfigure $f -translation lf -eofchar {}
    puts -nonewline $f foobar
    close $f
    file size $path(test1)
} 6
test iocmd-1.7 {puts command} {
    set f [open $path(test1) w]
    fconfigure $f -translation lf -eofchar {}
    puts $f foobar
    close $f
    file size $path(test1)
} 7
test iocmd-1.8 {puts command} {
    set f [open $path(test1) w]
    fconfigure $f -translation lf -eofchar {} -encoding iso8859-1
    puts -nonewline $f [binary format a4a5 foo bar]
    close $f
    file size $path(test1)
} 9

test iocmd-2.1 {flush command} {
   list [catch {flush} msg] $msg
} {1 {wrong # args: should be "flush channelId"}}
test iocmd-2.2 {flush command} {
   list [catch {flush a b c d e} msg] $msg
} {1 {wrong # args: should be "flush channelId"}}
test iocmd-2.3 {flush command} {
   list [catch {flush foo} msg] $msg
} {1 {can not find channel named "foo"}}
test iocmd-2.4 {flush command} {
   list [catch {flush stdin} msg] $msg
} {1 {channel "stdin" wasn't opened for writing}}

test iocmd-3.1 {gets command} {
   list [catch {gets} msg] $msg
} {1 {wrong # args: should be "gets channelId ?varName?"}}
test iocmd-3.2 {gets command} {
   list [catch {gets a b c d e f g} msg] $msg
} {1 {wrong # args: should be "gets channelId ?varName?"}}
test iocmd-3.3 {gets command} {
   list [catch {gets aaa} msg] $msg
} {1 {can not find channel named "aaa"}}
test iocmd-3.4 {gets command} {
   list [catch {gets stdout} msg] $msg
} {1 {channel "stdout" wasn't opened for reading}}
test iocmd-3.5 {gets command} {
    set f [open $path(test1) w]
    puts $f [binary format a4a5 foo bar]
    close $f
    set f [open $path(test1) r]
    set result [gets $f]
    close $f
    set x foo\x00
    set x "${x}bar\x00\x00"
    string compare $x $result
} 0

test iocmd-4.1 {read command} {
   list [catch {read} msg] $msg
} {1 {wrong # args: should be "read channelId ?numChars?" or "read ?-nonewline? channelId"}}
test iocmd-4.2 {read command} {
   list [catch {read a b c d e f g h} msg] $msg
} {1 {wrong # args: should be "read channelId ?numChars?" or "read ?-nonewline? channelId"}}
test iocmd-4.3 {read command} {
   list [catch {read aaa} msg] $msg
} {1 {can not find channel named "aaa"}}
test iocmd-4.4 {read command} {
   list [catch {read -nonewline} msg] $msg
} {1 {wrong # args: should be "read channelId ?numChars?" or "read ?-nonewline? channelId"}}
test iocmd-4.5 {read command} {
   list [catch {read -nonew file4} msg] $msg $::errorCode
} {1 {can not find channel named "-nonew"} {TCL LOOKUP CHANNEL -nonew}}
test iocmd-4.6 {read command} {
   list [catch {read stdout} msg] $msg
} {1 {channel "stdout" wasn't opened for reading}}
test iocmd-4.7 {read command} {
   list [catch {read -nonewline stdout} msg] $msg
} {1 {channel "stdout" wasn't opened for reading}}
test iocmd-4.8 {read command with incorrect combination of arguments} {
    file delete $path(test1)
    set f [open $path(test1) w]
    puts $f "Two lines: this one"
    puts $f "and this one"
    close $f
    set f [open $path(test1)]
    set x [list [catch {read -nonewline $f 20 z} msg] $msg $::errorCode]
    close $f
    set x
} {1 {wrong # args: should be "read channelId ?numChars?" or "read ?-nonewline? channelId"} {TCL WRONGARGS}}
test iocmd-4.9 {read command} {
    list [catch {read stdin foo} msg] $msg $::errorCode
} {1 {expected non-negative integer but got "foo"} {TCL VALUE NUMBER}}
test iocmd-4.10 {read command} {
    list [catch {read file107} msg] $msg $::errorCode
} {1 {can not find channel named "file107"} {TCL LOOKUP CHANNEL file107}}
set path(test3) [makeFile {} test3]
test iocmd-4.11 {read command} {
    set f [open $path(test3) w]
    set x [list [catch {read $f} msg] $msg $::errorCode]
    close $f
    string compare [string tolower $x] \
	[list 1 [format "channel \"%s\" wasn't opened for reading" $f] none]
} 0
test iocmd-4.12 {read command} -setup {
    set f [open $path(test1)]
} -body {
    read $f 12z
} -cleanup {
    close $f
} -result {expected non-negative integer but got "12z"} -errorCode {TCL VALUE NUMBER}

test iocmd-5.1 {seek command} -returnCodes error -body {
    seek
} -result {wrong # args: should be "seek channelId offset ?origin?"}
test iocmd-5.2 {seek command} -returnCodes error -body {
    seek a b c d e f g
} -result {wrong # args: should be "seek channelId offset ?origin?"}
test iocmd-5.3 {seek command} -returnCodes error -body {
    seek stdin gugu
} -result {expected integer but got "gugu"}
test iocmd-5.4 {seek command} -returnCodes error -body {
    seek stdin 100 gugu
} -result {bad origin "gugu": must be start, current, or end}

test iocmd-6.1 {tell command} {
    list [catch {tell} msg] $msg
} {1 {wrong # args: should be "tell channelId"}}
test iocmd-6.2 {tell command} {
    list [catch {tell a b c d e} msg] $msg
} {1 {wrong # args: should be "tell channelId"}}
test iocmd-6.3 {tell command} {
    list [catch {tell aaa} msg] $msg
} {1 {can not find channel named "aaa"}}

test iocmd-7.1 {close command} {
    list [catch {close} msg] $msg
} {1 {wrong # args: should be "close channelId ?direction?"}}
test iocmd-7.2 {close command} {
    list [catch {close a b c d e} msg] $msg
} {1 {wrong # args: should be "close channelId ?direction?"}}
test iocmd-7.3 {close command} {
    list [catch {close aaa} msg] $msg
} {1 {can not find channel named "aaa"}}
test iocmd-7.4 {close command} -setup {
    set chan [open [info script] r]
} -body {
    chan close $chan bar
} -cleanup {
    close $chan
} -returnCodes error -result "bad direction \"bar\": must be read or write"
test iocmd-7.5 {close command} -setup {
    set chan [open [info script] r]
} -body {
    chan close $chan write
} -cleanup {
    close $chan
} -returnCodes error -result "Half-close of write-side not possible, side not opened or already closed"

proc expectedOpts {got extra} {
    set basicOpts {
	-blocking -buffering -buffersize -encoding -eofchar -translation
    }
    set opts [list {*}$basicOpts {*}$extra]
    lset opts end [string cat "or " [lindex $opts end]]
    return [format {bad option "%s": should be one of %s} $got [join $opts ", "]]
}
test iocmd-8.1 {fconfigure command} -returnCodes error -body {
    fconfigure
} -result {wrong # args: should be "fconfigure channelId ?-option value ...?"}
test iocmd-8.2 {fconfigure command} -returnCodes error -body {
    fconfigure a b c d e f
} -result {wrong # args: should be "fconfigure channelId ?-option value ...?"}
test iocmd-8.3 {fconfigure command} -returnCodes error -body {
    fconfigure a b
} -result {can not find channel named "a"}
test iocmd-8.4 {fconfigure command} -setup {
    file delete $path(test1)
    set f1 [open $path(test1) w]
} -body {
    fconfigure $f1 froboz
} -returnCodes error -cleanup {
    close $f1
} -result [expectedOpts "froboz" {}]
test iocmd-8.5 {fconfigure command} -returnCodes error -body {
    fconfigure stdin -buffering froboz
} -result {bad value for -buffering: must be one of full, line, or none}
test iocmd-8.6 {fconfigure command} -returnCodes error -body {
    fconfigure stdin -translation froboz
} -result {bad value for -translation: must be one of auto, binary, cr, lf, crlf, or platform}
test iocmd-8.7 {fconfigure command} -setup {
    file delete $path(test1)
} -body {
    set f1 [open $path(test1) w]
    fconfigure $f1 -translation lf -eofchar {} -encoding utf-16
    fconfigure $f1
} -cleanup {
    catch {close $f1}
} -result {-blocking 1 -buffering full -buffersize 4096 -encoding utf-16 -eofchar {} -translation lf}
test iocmd-8.8 {fconfigure command} -setup {
    file delete $path(test1)
    set x {}
} -body {
    set f1 [open $path(test1) w]
    fconfigure $f1 -translation lf -buffering line -buffersize 3030 \
		-eofchar {} -encoding utf-16
    lappend x [fconfigure $f1 -buffering]
    lappend x [fconfigure $f1]
} -cleanup {
    catch {close $f1}
} -result {line {-blocking 1 -buffering line -buffersize 3030 -encoding utf-16 -eofchar {} -translation lf}}
test iocmd-8.9 {fconfigure command} -setup {
    file delete $path(test1)
} -body {
    set f1 [open $path(test1) w]
    fconfigure $f1 -translation binary -buffering none -buffersize 4040 \
		-eofchar {} -encoding binary
    fconfigure $f1
} -cleanup {
    catch {close $f1}
} -result {-blocking 1 -buffering none -buffersize 4040 -encoding binary -eofchar {} -translation lf}
test iocmd-8.10 {fconfigure command} -returnCodes error -body {
    fconfigure a b
} -result {can not find channel named "a"}
set path(fconfigure.dummy) [makeFile {} fconfigure.dummy]
test iocmd-8.11 {fconfigure command} -body {
    set chan [open $path(fconfigure.dummy) r]
    fconfigure $chan -froboz blarfo
} -returnCodes error -cleanup {
    catch {close $chan}
} -result [expectedOpts "-froboz" {}]
test iocmd-8.12 {fconfigure command} -body {
    set chan [open $path(fconfigure.dummy) r]
    fconfigure $chan -b blarfo
} -returnCodes error -cleanup {
    catch {close $chan}
} -result [expectedOpts "-b" {}]
test iocmd-8.13 {fconfigure command} -body {
    set chan [open $path(fconfigure.dummy) r]
    fconfigure $chan -buffer blarfo
} -returnCodes error -cleanup {
    catch {close $chan}
} -result [expectedOpts "-buffer" {}]
removeFile fconfigure.dummy
test iocmd-8.14 {fconfigure command} {
    fconfigure stdin -buffers
} 4096
test iocmd-8.15.1 {fconfigure command / tcp channel} -constraints {socket unixOrWin} -setup {
    set srv [socket -server iocmdSRV -myaddr 127.0.0.1 0]
    set port [lindex [fconfigure $srv -sockname] 2]
    proc iocmdSRV {sock ip port} {close $sock}
    set cli [socket 127.0.0.1 $port]
} -body {
    fconfigure $cli -blah
} -cleanup {
    close $cli
    close $srv
    unset cli srv port
    rename iocmdSRV {}
} -returnCodes error -result [expectedOpts "-blah" {-connecting -peername -sockname}]
test iocmd-8.16 {fconfigure command / tcp channel} -constraints socket -setup {
    set srv [socket -server iocmdSRV -myaddr 127.0.0.1 0]
    set port [lindex [fconfigure $srv -sockname] 2]
    proc iocmdSRV {sock ip port} {close $sock}
    set cli [socket 127.0.0.1 $port]
} -body {
    expr {[lindex [fconfigure $cli -peername] 2] == $port}
} -cleanup {
    close $cli
    close $srv
    unset cli srv port
    rename iocmdSRV {}
} -result 1
test iocmd-8.17 {fconfigure command / tcp channel} -constraints nonPortable -setup {
    set srv [socket -server iocmdSRV -myaddr 127.0.0.1 0]
    set port [lindex [fconfigure $srv -sockname] 2]
    proc iocmdSRV {sock ip port} {close $sock}
    set cli [socket 127.0.0.1 $port]
} -body {
    # It is possible that you don't get the connection reset by peer
    # error but rather a valid answer. Depends on the tcp implementation
    update
    puts $cli "blah"
    flush $cli;			# that flush could/should fail too
    update
    regsub -all {can([^:])+: } [catch {fconfigure $cli -peername} msg] {}
} -cleanup {
    close $cli
    close $srv
    unset cli srv port
    rename iocmdSRV {}
} -result 1
test iocmd-8.18 {fconfigure command / unix tty channel} -constraints {nonPortable unix} -setup {
    set tty ""
} -body {
    # might fail if /dev/ttya is unavailable
    set tty [open /dev/ttya]
    fconfigure $tty -blah blih
} -cleanup {
    if {$tty ne ""} {
	close $tty
    }
} -returnCodes error -result [expectedOpts "-blah" {-closemode -inputmode -mode -queue -ttystatus -xchar}]
test iocmd-8.19 {fconfigure command / win tty channel} -constraints {nonPortable win} -setup {
    set tty ""
} -body {
    # might fail early if com1 is unavailable
    set tty [open com1]
    fconfigure $tty -blah blih
} -cleanup {
    if {$tty ne ""} {
	close $tty
    }
} -returnCodes error -result [expectedOpts "-blah" {-closemode -mode -handshake -pollinterval -sysbuffer -timeout -ttycontrol -xchar}]
test iocmd-8.20 {fconfigure command / win console channel} -constraints {nonPortable win} -setup {
    # I don't know how else to open the console, but this is non-portable
    set console stdin
} -body {
    fconfigure $console -blah blih
} -returnCodes error -result [expectedOpts "-blah" {-inputmode}]
# TODO: Test parsing of serial channel options (nonPortable, since requires an
# open channel to work with).

test iocmd-9.1 {eof command} {
    list [catch {eof} msg] $msg $::errorCode
} {1 {wrong # args: should be "eof channelId"} {TCL WRONGARGS}}
test iocmd-9.2 {eof command} {
    list [catch {eof a b} msg] $msg $::errorCode
} {1 {wrong # args: should be "eof channelId"} {TCL WRONGARGS}}
test iocmd-9.3 {eof command} {
    catch {close file100}
    list [catch {eof file100} msg] $msg $::errorCode
} {1 {can not find channel named "file100"} {TCL LOOKUP CHANNEL file100}}

# The tests for Tcl_ExecObjCmd are in exec.test

test iocmd-10.1 {fblocked command} {
    list [catch {fblocked} msg] $msg
} {1 {wrong # args: should be "fblocked channelId"}}
test iocmd-10.2 {fblocked command} {
    list [catch {fblocked a b c d e f g} msg] $msg
} {1 {wrong # args: should be "fblocked channelId"}}
test iocmd-10.3 {fblocked command} {
    list [catch {fblocked file1000} msg] $msg
} {1 {can not find channel named "file1000"}}
test iocmd-10.4 {fblocked command} {
    list [catch {fblocked stdout} msg] $msg
} {1 {channel "stdout" wasn't opened for reading}}
test iocmd-10.5 {fblocked command} {
    fblocked stdin
} 0

set path(test4) [makeFile {} test4]
set path(test5) [makeFile {} test5]

test iocmd-11.1 {I/O to command pipelines} {unixOrWin unixExecs} {
    set f [open $path(test4) w]
    close $f
    list [catch {open "| cat < \"$path(test4)\" > \"$path(test5)\"" w} msg] $msg $::errorCode
} {1 {can't write input to command: standard input was redirected} {TCL OPERATION EXEC BADREDIRECT}}
test iocmd-11.2 {I/O to command pipelines} {unixOrWin unixExecs} {
    list [catch {open "| echo > \"$path(test5)\"" r} msg] $msg $::errorCode
} {1 {can't read output from command: standard output was redirected} {TCL OPERATION EXEC BADREDIRECT}}
test iocmd-11.3 {I/O to command pipelines} {unixOrWin unixExecs} {
    list [catch {open "| echo > \"$path(test5)\"" r+} msg] $msg $::errorCode
} {1 {can't read output from command: standard output was redirected} {TCL OPERATION EXEC BADREDIRECT}}
test iocmd-11.4 {I/O to command pipelines} {notValgrind unixOrWin} {
    list [catch {open "| no_such_command_exists" rb} msg] $msg $::errorCode
} {1 {couldn't execute "no_such_command_exists": no such file or directory} {POSIX ENOENT {no such file or directory}}}

test iocmd-12.1 {POSIX open access modes: RDONLY} {
    file delete $path(test1)
    set f [open $path(test1) w]
    puts $f "Two lines: this one"
    puts $f "and this one"
    close $f
    set f [open $path(test1) RDONLY]
    set x [list [gets $f] [catch {puts $f Test} msg] $msg]
    close $f
    string compare $x \
	"{Two lines: this one} 1 [list [format "channel \"%s\" wasn't opened for writing" $f]]"
} 0
test iocmd-12.2 {POSIX open access modes: RDONLY} -match regexp -body {
    file delete $path(test3)
    open $path(test3) RDONLY
} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
test iocmd-12.3 {POSIX open access modes: WRONLY} -match regexp -body {
    file delete $path(test3)
    open $path(test3) WRONLY
} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
#
# Test 13.4 relies on assigning the same channel name twice.
#
test iocmd-12.4 {POSIX open access modes: WRONLY} {unix} {
    file delete $path(test3)
    set f [open $path(test3) w]
    fconfigure $f -eofchar {}
    puts $f xyzzy
    close $f
    set f [open $path(test3) WRONLY]
    fconfigure $f -eofchar {}
    puts -nonewline $f "ab"
    seek $f 0 current
    set x [list [catch {gets $f} msg] $msg]
    close $f
    set f [open $path(test3) r]
    fconfigure $f -eofchar {}
    lappend x [gets $f]
    close $f
    set y [list 1 [format "channel \"%s\" wasn't opened for reading" $f] abzzy]
    string compare $x $y
} 0
test iocmd-12.5 {POSIX open access modes: RDWR} -match regexp -body {
    file delete $path(test3)
    open $path(test3) RDWR
} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
test iocmd-12.6 {POSIX open access modes: errors} {
    concat [catch {open $path(test3) "FOO \{BAR BAZ"} msg] $msg\n$::errorInfo
} "1 unmatched open brace in list
unmatched open brace in list
    while processing open access modes \"FOO {BAR BAZ\"
    invoked from within
\"open \$path(test3) \"FOO \\{BAR BAZ\"\""
test iocmd-12.7 {POSIX open access modes: errors} {
  list [catch {open $path(test3) {FOO BAR BAZ}} msg] $msg
} {1 {invalid access mode "FOO": must be RDONLY, WRONLY, RDWR, APPEND, BINARY, CREAT, EXCL, NOCTTY, NONBLOCK, or TRUNC}}
test iocmd-12.8 {POSIX open access modes: errors} {
    list [catch {open $path(test3) {TRUNC CREAT}} msg] $msg
} {1 {access mode must include either RDONLY, WRONLY, or RDWR}}
close [open $path(test3) w]
test iocmd-12.9 {POSIX open access modes: BINARY} {
    list [catch {open $path(test1) BINARY} msg] $msg
} {1 {access mode must include either RDONLY, WRONLY, or RDWR}}
test iocmd-12.10 {POSIX open access modes: BINARY} {
    set f [open $path(test1) {WRONLY BINARY TRUNC}]
    puts $f a
    puts $f b
    puts -nonewline $f c	;# contents are now 5 bytes: a\nb\nc
    close $f
    set f [open $path(test1) r]
    fconfigure $f -translation binary
    set result [string length [read $f]]
    close $f
    set result
} 5
test iocmd-12.11 {POSIX open access modes: BINARY} {
    set f [open $path(test1) {WRONLY BINARY TRUNC}]
    puts $f \u0248		;# gets truncated to \u0048
    close $f
    set f [open $path(test1) r]
    fconfigure $f -translation binary
    set result [read -nonewline $f]
    close $f
    set result
} \u0048

test iocmd-13.1 {errors in open command} {
    list [catch {open} msg] $msg
} {1 {wrong # args: should be "open fileName ?access? ?permissions?"}}
test iocmd-13.2 {errors in open command} {
    list [catch {open a b c d} msg] $msg
} {1 {wrong # args: should be "open fileName ?access? ?permissions?"}}
test iocmd-13.3 {errors in open command} {
    list [catch {open $path(test1) x} msg] $msg
} {1 {illegal access mode "x"}}
test iocmd-13.4 {errors in open command} {
    list [catch {open $path(test1) rw} msg] $msg
} {1 {illegal access mode "rw"}}
test iocmd-13.5 {errors in open command} {
    list [catch {open $path(test1) r+1} msg] $msg
} {1 {illegal access mode "r+1"}}
test iocmd-13.6 {errors in open command} {
    set msg [list [catch {open _non_existent_} msg] $msg $::errorCode]
    regsub [file join {} _non_existent_] $msg "_non_existent_" msg
    string tolower $msg
} {1 {couldn't open "_non_existent_": no such file or directory} {posix enoent {no such file or directory}}}
test iocmd-13.7 {errors in open command} {
    list [catch {open $path(test1) b} msg] $msg
} {1 {illegal access mode "b"}}
test iocmd-13.8 {errors in open command} {
    list [catch {open $path(test1) rbb} msg] $msg
} {1 {illegal access mode "rbb"}}
test iocmd-13.9 {errors in open command} {
    list [catch {open $path(test1) r++} msg] $msg
} {1 {illegal access mode "r++"}}
test iocmd-13.10.1 {open for append, a mode} -setup {
    set log   [makeFile {} out]
    set chans {}
} -body {
    foreach i { 0 1 2 3 4 5 6 7 8 9 } {
	puts [set ch [open $log a]] $i
	lappend chans $ch
    }
    foreach ch $chans {catch {close $ch}}
    lsort [split [string trim [viewFile out]] \n]
} -cleanup {
    removeFile out
    # Ensure that channels are gone, even if body failed to do so
    foreach ch $chans {catch {close $ch}}
} -result {0 1 2 3 4 5 6 7 8 9}
test iocmd-13.10.2 {open for append, O_APPEND} -setup {
    set log   [makeFile {} out]
    set chans {}
} -body {
    foreach i { 0 1 2 3 4 5 6 7 8 9 } {
	puts [set ch [open $log {WRONLY CREAT APPEND}]] $i
	lappend chans $ch
    }
    foreach ch $chans {catch {close $ch}}
    lsort [split [string trim [viewFile out]] \n]
} -cleanup {
    removeFile out
    # Ensure that channels are gone, even if body failed to do so
    foreach ch $chans {catch {close $ch}}
} -result {0 1 2 3 4 5 6 7 8 9}
test ioCmd-13.11 {open ... a+ must not use O_APPEND: Bug 1773127} -setup {
    set f [makeFile {} ioutil41.tmp]
    set fid [open $f wb]
    puts -nonewline $fid 123
    close $fid
} -body {
    set fid [open $f ab+]
    puts -nonewline $fid 456
    seek $fid 2
    set d [read $fid 2]
    seek $fid 4
    puts -nonewline $fid x
    close $fid
    set fid [open $f rb]
    append d [read $fid]
    close $fid
    return $d
} -cleanup {
    removeFile $f
} -result 341234x6


test iocmd-14.1 {file id parsing errors} {
    list [catch {eof gorp} msg] $msg $::errorCode
} {1 {can not find channel named "gorp"} {TCL LOOKUP CHANNEL gorp}}
test iocmd-14.2 {file id parsing errors} {
    list [catch {eof filex} msg] $msg
} {1 {can not find channel named "filex"}}
test iocmd-14.3 {file id parsing errors} {
    list [catch {eof file12a} msg] $msg
} {1 {can not find channel named "file12a"}}
test iocmd-14.4 {file id parsing errors} {
    list [catch {eof file123} msg] $msg
} {1 {can not find channel named "file123"}}
test iocmd-14.5 {file id parsing errors} {
    list [catch {eof stdout} msg] $msg
} {0 0}
test iocmd-14.6 {file id parsing errors} {
    list [catch {eof stdin} msg] $msg
} {0 0}
test iocmd-14.7 {file id parsing errors} {
    list [catch {eof stdout} msg] $msg
} {0 0}
test iocmd-14.8 {file id parsing errors} {
    list [catch {eof stderr} msg] $msg
} {0 0}
test iocmd-14.9 {file id parsing errors} {
    list [catch {eof stderr1} msg] $msg
} {1 {can not find channel named "stderr1"}}

set f [open $path(test1) w]
close $f

set expect "1 {can not find channel named \"$f\"}"
test iocmd-14.10 {file id parsing errors} {
    list [catch {eof $f} msg] $msg
} $expect

test iocmd-15.1 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy} msg] $msg
} {1 {wrong # args: should be "fcopy input output ?-size size? ?-command callback?"}}
test iocmd-15.2 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy 1} msg] $msg
} {1 {wrong # args: should be "fcopy input output ?-size size? ?-command callback?"}}
test iocmd-15.3 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy 1 2 3 4 5 6 7} msg] $msg
} {1 {wrong # args: should be "fcopy input output ?-size size? ?-command callback?"}}
test iocmd-15.4 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy 1 2 3} msg] $msg
} {1 {wrong # args: should be "fcopy input output ?-size size? ?-command callback?"}}
test iocmd-15.5 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy 1 2 3 4 5} msg] $msg
} {1 {wrong # args: should be "fcopy input output ?-size size? ?-command callback?"}}

set path(test2) [makeFile {} test2]
set f [open $path(test1) w]
close $f
set rfile [open $path(test1) r]
set wfile [open $path(test2) w]

test iocmd-15.6 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy foo $wfile} msg] $msg
} {1 {can not find channel named "foo"}}
test iocmd-15.7 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy $rfile foo} msg] $msg
} {1 {can not find channel named "foo"}}
test iocmd-15.8 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy $wfile $wfile} msg] $msg
} "1 {channel \"$wfile\" wasn't opened for reading}"
test iocmd-15.9 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy $rfile $rfile} msg] $msg
} "1 {channel \"$rfile\" wasn't opened for writing}"
test iocmd-15.10 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy $rfile $wfile foo bar} msg] $msg
} {1 {bad option "foo": must be -size or -command}}
test iocmd-15.11 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy $rfile $wfile -size foo} msg] $msg
} {1 {expected integer but got "foo"}}
test iocmd-15.12 {Tcl_FcopyObjCmd} {fcopy} {
    list [catch {fcopy $rfile $wfile -command bar -size foo} msg] $msg
} {1 {expected integer but got "foo"}}

close $rfile
close $wfile

# ### ### ### ######### ######### #########
## Testing the reflected channel.

test iocmd-20.0 {chan, wrong#args} {
    catch {chan} msg
    set msg
} {wrong # args: should be "chan subcommand ?arg ...?"}
test iocmd-20.1 {chan, unknown method} -body {
    chan foo
} -returnCodes error -match glob -result {unknown or ambiguous subcommand "foo": must be *}

# --- --- --- --------- --------- ---------
# chan create, and method "initalize"

test iocmd-21.0 {chan create, wrong#args, not enough} {
    catch {chan create} msg
    set msg
} {wrong # args: should be "chan create mode cmdprefix"}
test iocmd-21.1 {chan create, wrong#args, too many} {
    catch {chan create a b c} msg
    set msg
} {wrong # args: should be "chan create mode cmdprefix"}
test iocmd-21.2 {chan create, invalid r/w mode, empty} {
    proc foo {} {}
    catch {chan create {} foo} msg
    rename foo {}
    set msg
} {bad mode list: is empty}
test iocmd-21.3 {chan create, invalid r/w mode, bad string} {
    proc foo {} {}
    catch {chan create {c} foo} msg
    rename foo {}
    set msg
} {bad mode "c": must be read or write}
test iocmd-21.4 {chan create, bad handler, not a list} {
    catch {chan create {r w} "foo \{"} msg
    set msg
} {unmatched open brace in list}
test iocmd-21.5 {chan create, bad handler, not a command} {
    catch {chan create {r w} foo} msg
    set msg
} {invalid command name "foo"}
test iocmd-21.6 {chan create, initialize failed, bad signature} {
    proc foo {} {}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} {wrong # args: should be "foo"}
test iocmd-21.7 {chan create, initialize failed, bad signature} {
    proc foo {} {}
    catch {chan create {r w} ::foo} msg
    rename foo {}
    set msg
} {wrong # args: should be "::foo"}
test iocmd-21.8 {chan create, initialize failed, bad result, not a list} -body {
    proc foo {args} {return "\{"}
    catch {chan create {r w} foo} msg
    rename foo {}
    set ::errorInfo
} -match glob -result {chan handler "foo initialize" returned non-list: *}
test iocmd-21.9 {chan create, initialize failed, bad result, not a list} -body {
    proc foo {args} {return \{\{\}}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} -match glob -result {chan handler "foo initialize" returned non-list: *}
test iocmd-21.10 {chan create, initialize failed, bad result, empty list} -body {
    proc foo {args} {}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} -match glob -result {*all required methods*}
test iocmd-21.11 {chan create, initialize failed, bad result, bogus method name} -body {
    proc foo {args} {return 1}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} -match glob -result {*bad method "1": must be *}
test iocmd-21.12 {chan create, initialize failed, bad result, bogus method name} -body {
    proc foo {args} {return {a b c}}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} -match glob -result {*bad method "c": must be *}
test iocmd-21.13 {chan create, initialize failed, bad result, required methods missing} -body {
    proc foo {args} {return {initialize finalize}}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} -match glob -result {*all required methods*}
test iocmd-21.14 {chan create, initialize failed, bad result, mode/handler mismatch} -body {
    proc foo {args} {return {initialize finalize watch read}}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} -match glob -result {*lacks a "write" method}
test iocmd-21.15 {chan create, initialize failed, bad result, mode/handler mismatch} -body {
    proc foo {args} {return {initialize finalize watch write}}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} -match glob -result {*lacks a "read" method}
test iocmd-21.16 {chan create, initialize failed, bad result, cget(all) mismatch} -body {
    proc foo {args} {return {initialize finalize watch cget write read}}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} -match glob -result {*supports "cget" but not "cgetall"}
test iocmd-21.17 {chan create, initialize failed, bad result, cget(all) mismatch} -body {
    proc foo {args} {return {initialize finalize watch cgetall read write}}
    catch {chan create {r w} foo} msg
    rename foo {}
    set msg
} -match glob -result {*supports "cgetall" but not "cget"}
test iocmd-21.18 {chan create, initialize ok, creates channel} -match glob -body {
    proc foo {args} {
	global  res
	lappend res $args
	if {[lindex $args 0] ne "initialize"} {return}
	return {initialize finalize watch read write}
    }
    set res {}
    lappend res [file channel rc*]
    lappend res [chan create {r w} foo]
    lappend res [close [lindex $res end]]
    lappend res [file channel rc*]
    rename foo {}
    set res
} -result {{} {initialize rc* {read write}} rc* {finalize rc*} {} {}}
test iocmd-21.19 {chan create, init failure -> no channel, no finalize} -match glob -body {
    proc foo {args} {
	global  res
	lappend res $args
	return {}
    }
    set res {}
    lappend res [file channel rc*]
    lappend res [catch {chan create {r w} foo} msg]
    lappend res $msg
    lappend res [file channel rc*]
    rename foo {}
    set res
} -result {{} {initialize rc* {read write}} 1 {*all required methods*} {}}
test iocmd-21.20 {Bug 88aef05cda} -setup {
    proc foo {method chan args} {
	switch -- $method blocking {
	    chan configure $chan -blocking [lindex $args 0]
	    return
	} initialize {
	    return {initialize finalize watch blocking read write
		    configure cget cgetall}
	} finalize {
	    return
	}
    }
    set ch [chan create {read write} foo]
} -body {
    chan configure $ch -blocking 0
} -cleanup {
    close $ch
    rename foo {}
} -match glob -returnCodes 1 -result {*(infinite loop?)*}
test iocmd-21.21 {[close] in [read] segfaults} -setup {
    proc foo {method chan args} {
	switch -- $method initialize {
	    return {initialize finalize watch read}
	} finalize {} watch {} read {
	    close $chan
	    return a
	}
    }
    set ch [chan create read foo]
} -body {
    read $ch 0
} -cleanup {
    close $ch
    rename foo {}
} -result {}
test iocmd-21.22 {[close] in [read] segfaults} -setup {
    proc foo {method chan args} {
	switch -- $method initialize {
	    return {initialize finalize watch read}
	} finalize {} watch {} read {
	    catch {close $chan}
	    return a
	}
    }
    set ch [chan create read foo]
} -body {
    read $ch 1
} -returnCodes error -cleanup {
    catch {close $ch}
    rename foo {}
} -match glob -result {*invalid argument*}
test iocmd-21.23 {[close] in [gets] segfaults} -setup {
    proc foo {method chan args} {
	switch -- $method initialize {
	    return {initialize finalize watch read}
	} finalize {} watch {} read {
	    catch {close $chan}
	    return \n
	}
    }
    set ch [chan create read foo]
} -body {
    gets $ch
} -cleanup {
    catch {close $ch}
    rename foo {}
} -result {}
test iocmd-21.24 {[close] in binary [gets] segfaults} -setup {
    proc foo {method chan args} {
	switch -- $method initialize {
	    return {initialize finalize watch read}
	} finalize {} watch {} read {
	    catch {close $chan}
	    return \n
	}
    }
    set ch [chan create read foo]
} -body {
    chan configure $ch -translation binary
    gets $ch
} -cleanup {
    catch {close $ch}
    rename foo {}
} -result {}

# --- --- --- --------- --------- ---------
# Helper commands to record the arguments to handler methods.

# Stored in a script so that the threads and interpreters needing this
# code do not need their own copy but can access this variable.

set helperscript {

proc note  {item}  {global res; lappend res $item; return}
proc track {}      {upvar args item; note $item; return}
proc notes {items} {foreach i $items {note $i}}
# This forces the return options to be in the order that the test expects!
proc noteOpts opts {global res; lappend res [dict merge {
    -code !?! -level !?! -errorcode !?! -errorline !?! -errorinfo !?!
} $opts]; return}

# Helper command, canned result for 'initialize' method.
# Gets the optional methods as arguments. Use return features
# to post the result higher up.

proc init {args} {
    lappend args initialize finalize watch read write
    return -code return $args
}
proc oninit {args} {
    upvar args hargs
    if {[lindex $hargs 0] ne "initialize"} {return}
    lappend args initialize finalize watch read write
    return -code return $args
}
proc onfinal {} {
    upvar args hargs
    if {[lindex $hargs 0] ne "finalize"} {return}
    return -code return ""
}

proc onwatch {} {
    upvar args hargs
    lassign $hargs watch chan eventspec
    if {$watch ne "watch"} return
    foreach spec $eventspec {
	chan postevent $chan $spec
    }
    return
}

}

# Set everything up in the main thread.
eval $helperscript

# --- --- --- --------- --------- ---------
# method finalize

test iocmd-22.1 {chan finalize, handler destruction has no effect on channel} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return}
    note [set c [chan create {r w} foo]]
    rename foo {}
    note [file channels rc*]
    note [catch {close $c} msg]; note $msg
    note [file channels rc*]
    set res
} -result {{initialize rc* {read write}} rc* rc* 1 {invalid command name "foo"} {}}
test iocmd-22.2 {chan finalize, for close} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return {}}
    note [set c [chan create {r w} foo]]
    close $c
    # Close deleted the channel.
    note [file channels rc*]
    # Channel destruction does not kill handler command!
    note [info command foo]
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} {} foo}
test iocmd-22.3 {chan finalize, for close, error, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return -code error 5}
    note [set c [chan create {r w} foo]]
    note [catch {close $c} msg]; note $msg
    # Channel is gone despite error.
    note [file channels rc*]
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 5 {}}
test iocmd-22.4 {chan finalize, for close, error, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; error FOO}
    note [set c [chan create {r w} foo]]
    note [catch {close $c} msg]; note $msg; note $::errorInfo
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 FOO {FOO
*"close $c"}}
test iocmd-22.5 {chan finalize, for close, arbitrary result, ignored} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return SOMETHING}
    note [set c [chan create {r w} foo]]
    note [catch {close $c} msg]; note $msg
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 0 {}}
test iocmd-22.6 {chan finalize, for close, break, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return -code 3}
    note [set c [chan create {r w} foo]]
    note [catch {close $c} msg]; note $msg
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 *bad code*}
test iocmd-22.7 {chan finalize, for close, continue, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return -code 4}
    note [set c [chan create {r w} foo]]
    note [catch {close $c} msg]; note $msg
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 *bad code*}
test iocmd-22.8 {chan finalize, for close, custom code, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return -code 777 BANG}
    note [set c [chan create {r w} foo]]
    note [catch {close $c} msg]; note $msg
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 *bad code*}
test iocmd-22.9 {chan finalize, for close, ignore level, close error} -match glob -setup {
    set res {}
} -body {
    proc foo {args} {track; oninit; return -level 5 -code 777 BANG}
    note [set c [chan create {r w} foo]]
    note [catch {close $c} msg opt]; note $msg; noteOpts $opt
    return $res
} -cleanup {
    rename foo {}
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "finalize"*}}

# --- === *** ###########################
# method read

test iocmd-23.1 {chan read, regular data return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return snarf
    }
    set c [chan create {r w} foo]
    note [read $c 10]
    close $c
    rename foo {}
    set res
} -result {{read rc* 4096} {read rc* 4096} snarfsnarf}
test iocmd-23.2 {chan read, bad data return, to much} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return [string repeat snarf 1000]
    }
    set c [chan create {r w} foo]
    note [catch {read $c 2} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{read rc* 4096} 1 {read delivered more than requested}}
test iocmd-23.3 {chan read, for non-readable channel} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track; note MUST_NOT_HAPPEN
    }
    set c [chan create {w} foo]
    note [catch {read $c 2} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {1 {channel "rc*" wasn't opened for reading}}
test iocmd-23.4 {chan read, error return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {read $c 2} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{read rc* 4096} 1 BOOM!}
test iocmd-23.5 {chan read, break return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -code break BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {read $c 2} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{read rc* 4096} 1 *bad code*}
test iocmd-23.6 {chan read, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -code continue BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {read $c 2} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{read rc* 4096} 1 *bad code*}
test iocmd-23.7 {chan read, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -code 777 BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {read $c 2} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{read rc* 4096} 1 *bad code*}
test iocmd-23.8 {chan read, level is squashed} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -level 55 -code 777 BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {read $c 2} msg opt]; note $msg; noteOpts $opt
    close $c
    rename foo {}
    set res
} -result {{read rc* 4096} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "read"*}}
test iocmd-23.9 {chan read, no data means eof} -match glob -setup {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return ""
    }
    set c [chan create {r w} foo]
} -body {
    note [read $c 2]
    note [eof $c]
    set res
} -cleanup {
    close $c
    rename foo {}
    unset res
} -result {{read rc* 4096} {} 1}
test iocmd-23.10 {chan read, EAGAIN means no data, yet no eof either} -match glob -setup {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	error EAGAIN
    }
    set c [chan create {r w} foo]
} -body {
    note [read $c 2]
    note [eof $c]
    set res
} -cleanup {
    close $c
    rename foo {}
    unset res
} -result {{read rc* 4096} {} 0}
test iocmd-23.11 {chan read, close pulls the rug out} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	set args [lassign $args sub id]
	if {$sub ne "read"} {return}
	close $id
	return {}
    }
    set c [chan create {r} foo]
    note [read $c]
    rename foo {}
    set res
} -result {{read rc* 4096} {}}

# --- === *** ###########################
# method write

test iocmd-24.1 {chan write, regular write} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	set     written [string length [lindex $args 2]]
	note   $written
	return $written
    }
    set c [chan create {r w} foo]
    puts -nonewline $c snarf; flush $c
    close $c
    rename foo {}
    set res
} -result {{write rc* snarf} 5}
test iocmd-24.2 {chan write, partial write is ok} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	set     written [string length [lindex $args 2]]
	if {$written > 10} {set written [expr {$written / 2}]}
	note   $written
	return $written
    }
    set c [chan create {r w} foo]
    puts -nonewline $c snarfsnarfsnarf; flush $c
    close $c
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 7 {write rc* arfsnarf} 8}
test iocmd-24.3 {chan write, failed write} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note -1; return -1}
    set c [chan create {r w} foo]
    puts -nonewline $c snarfsnarfsnarf; flush $c
    close $c
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} -1}
test iocmd-24.4 {chan write, non-writable channel} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r} foo]
    note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {1 {channel "rc*" wasn't opened for writing}}
test iocmd-24.5 {chan write, bad result, more written than data} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return 10000}
    set c [chan create {r w} foo]
    note [catch {puts -nonewline $c snarf; flush $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{write rc* snarf} 1 {write wrote more than requested}}
test iocmd-24.6 {chan write, bad result, zero-length write} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return 0}
    set c [chan create {r w} foo]
    note [catch {puts -nonewline $c snarf; flush $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{write rc* snarf} 1 {write wrote nothing}}
test iocmd-24.7 {chan write, failed write, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code error BOOM!}
    set c [chan create {r w} foo]
    note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
    note $msg
    close $c
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 BOOM!}
test iocmd-24.8 {chan write, failed write, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; error BOOM!}
    set c [chan create {r w} foo]
    notes [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
    note $msg
    close $c
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 BOOM!}
test iocmd-24.9 {chan write, failed write, break return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code break BOOM!}
    set c [chan create {r w} foo]
    note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
    note $msg
    close $c
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 *bad code*}
test iocmd-24.10 {chan write, failed write, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code continue BOOM!}
    set c [chan create {r w} foo]
    note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
    note $msg
    close $c
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 *bad code*}
test iocmd-24.11 {chan write, failed write, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code 777 BOOM!}
    set c [chan create {r w} foo]
    note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
    note $msg
    close $c
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 *bad code*}
test iocmd-24.12 {chan write, failed write, non-numeric return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return BANG}
    set c [chan create {r w} foo]
    note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
    note $msg
    close $c
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 {expected integer but got "BANG"}}
test iocmd-24.13 {chan write, failed write, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -level 55 -code 777 BOOM!}
    set c [chan create {r w} foo]
    note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg opt]
    note $msg
    noteOpts $opt
    close $c
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "write"*}}
test iocmd-24.14 {chan write, no EAGAIN means that writing is allowed at this time, bug 2936225} -match glob -setup {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return 3
    }
    set c [chan create {r w} foo]
} -body {
    note [puts -nonewline $c ABC ; flush $c]
    set res
} -cleanup {
    close $c
    rename foo {}
    unset res
} -result {{write rc* ABC} {}}
test iocmd-24.15 {chan write, EAGAIN means that writing is not allowed at this time, bug 2936225} -match glob -setup {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	# Note: The EAGAIN signals that the channel cannot accept
	# write requests right now, this in turn causes the IO core to
	# request the generation of writable events (see expected
	# result below, and compare to case 24.14 above).
	error EAGAIN
    }
    set c [chan create {r w} foo]
} -body {
    note [puts -nonewline $c ABC ; flush $c]
    set res
} -cleanup {
    close $c
    rename foo {}
    unset res
} -result {{write rc* ABC} {watch rc* write} {}}

# --- === *** ###########################
# method cgetall

test iocmd-25.1 {chan configure, cgetall, standard options} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    note [fconfigure $c]
    close $c
    rename foo {}
    set res
} -result {{-blocking 1 -buffering full -buffersize 4096 -encoding * -eofchar {{} {}} -translation {auto *}}}
test iocmd-25.2 {chan configure, cgetall, no options} -match glob -body {
    set res {}
    proc foo {args} {oninit cget cgetall; onfinal; track; return ""}
    set c [chan create {r w} foo]
    note [fconfigure $c]
    close $c
    rename foo {}
    set res
} -result {{cgetall rc*} {-blocking 1 -buffering full -buffersize 4096 -encoding * -eofchar {{} {}} -translation {auto *}}}
test iocmd-25.3 {chan configure, cgetall, regular result} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return "-bar foo -snarf x"
    }
    set c [chan create {r w} foo]
    note [fconfigure $c]
    close $c
    rename foo {}
    set res
} -result {{cgetall rc*} {-blocking 1 -buffering full -buffersize 4096 -encoding * -eofchar {{} {}} -translation {auto *} -bar foo -snarf x}}
test iocmd-25.4 {chan configure, cgetall, bad result, list of uneven length} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return "-bar"
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cgetall rc*} 1 {Expected list with even number of elements, got 1 element instead}}
test iocmd-25.5 {chan configure, cgetall, bad result, not a list} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return "\{"
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cgetall rc*} 1 {unmatched open brace in list}}
test iocmd-25.6 {chan configure, cgetall, error return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cgetall rc*} 1 BOOM!}
test iocmd-25.7 {chan configure, cgetall, break return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code break BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cgetall rc*} 1 *bad code*}
test iocmd-25.8 {chan configure, cgetall, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code continue BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cgetall rc*} 1 *bad code*}
test iocmd-25.9 {chan configure, cgetall, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code 777 BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cgetall rc*} 1 *bad code*}
test iocmd-25.10 {chan configure, cgetall, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -level 55 -code 777 BANG
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c} msg opt]; note $msg; noteOpts $opt
    close $c
    rename foo {}
    set res
} -result {{cgetall rc*} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "cgetall"*}}

# --- === *** ###########################
# method configure

test iocmd-26.1 {chan configure, set standard option} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track; note MUST_NOT_HAPPEN; return
    }
    set c [chan create {r w} foo]
    note [fconfigure $c -translation lf]
    close $c
    rename foo {}
    set res
} -result {{}}
test iocmd-26.2 {chan configure, set option, error return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo bar} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} 1 BOOM!}
test iocmd-26.3 {chan configure, set option, ok return} -match glob -body {
    set res {}
    proc foo {args} {oninit configure; onfinal; track; return}
    set c [chan create {r w} foo]
    note [fconfigure $c -rc-foo bar]
    close $c
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} {}}
test iocmd-26.4 {chan configure, set option, break return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -code break BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo bar} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} 1 *bad code*}
test iocmd-26.5 {chan configure, set option, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -code continue BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo bar} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} 1 *bad code*}
test iocmd-26.6 {chan configure, set option, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -code 444 BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo bar} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} 1 *bad code*}
test iocmd-26.7 {chan configure, set option, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -level 55 -code 444 BANG
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo bar} msg opt]; note $msg; noteOpts $opt
    close $c
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "configure"*}}

# --- === *** ###########################
# method cget

test iocmd-27.1 {chan configure, get option, ok return} -match glob -body {
    set res {}
    proc foo {args} {oninit cget cgetall; onfinal; track; return foo}
    set c [chan create {r w} foo]
    note [fconfigure $c -rc-foo]
    close $c
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} foo}
test iocmd-27.2 {chan configure, get option, error return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} 1 BOOM!}
test iocmd-27.3 {chan configure, get option, break return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} 1 BOOM!}
test iocmd-27.4 {chan configure, get option, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code continue BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} 1 *bad code*}
test iocmd-27.5 {chan configure, get option, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code 333 BOOM!
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} 1 *bad code*}
test iocmd-27.6 {chan configure, get option, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -level 77 -code 333 BANG
    }
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -rc-foo} msg opt]; note $msg; noteOpts $opt
    close $c
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "cget"*}}

# --- === *** ###########################
# method seek

test iocmd-28.1 {chan tell, not supported by handler} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    note [tell $c]
    close $c
    rename foo {}
    set res
} -result {-1}
test iocmd-28.2 {chan tell, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code error BOOM!}
    set c [chan create {r w} foo]
    note [catch {tell $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 BOOM!}
test iocmd-28.3 {chan tell, break return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code break BOOM!}
    set c [chan create {r w} foo]
    note [catch {tell $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 *bad code*}
test iocmd-28.4 {chan tell, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code continue BOOM!}
    set c [chan create {r w} foo]
    note [catch {tell $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 *bad code*}
test iocmd-28.5 {chan tell, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code 222 BOOM!}
    set c [chan create {r w} foo]
    note [catch {tell $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 *bad code*}
test iocmd-28.6 {chan tell, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -level 11 -code 222 BANG}
    set c [chan create {r w} foo]
    note [catch {tell $c} msg opt]; note $msg; noteOpts $opt
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "seek"*}}
test iocmd-28.7 {chan tell, regular return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return 88}
    set c [chan create {r w} foo]
    note [tell $c]
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 current} 88}
test iocmd-28.8 {chan tell, negative return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -1}
    set c [chan create {r w} foo]
    note [catch {tell $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 {Tried to seek before origin}}
test iocmd-28.9 {chan tell, string return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return BOGUS}
    set c [chan create {r w} foo]
    note [catch {tell $c} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 {expected integer but got "BOGUS"}}
test iocmd-28.10 {chan seek, not supported by handler} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    note [catch {seek $c 0 start} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {1 {error during seek on "rc*": invalid argument}}
test iocmd-28.11 {chan seek, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code error BOOM!}
    set c [chan create {r w} foo]
    note [catch {seek $c 0 start} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 BOOM!}
test iocmd-28.12 {chan seek, break return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code break BOOM!}
    set c [chan create {r w} foo]
    note [catch {seek $c 0 start} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 *bad code*}
test iocmd-28.13 {chan seek, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code continue BOOM!}
    set c [chan create {r w} foo]
    note [catch {seek $c 0 start} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 *bad code*}
test iocmd-28.14 {chan seek, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code 99 BOOM!}
    set c [chan create {r w} foo]
    note [catch {seek $c 0 start} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 *bad code*}
test iocmd-28.15 {chan seek, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -level 33 -code 99 BANG}
    set c [chan create {r w} foo]
    note [catch {seek $c 0 start} msg opt]; note $msg; noteOpts $opt
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "seek"*}}
test iocmd-28.16 {chan seek, bogus return, negative location} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -45}
    set c [chan create {r w} foo]
    note [catch {seek $c 0 start} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 {Tried to seek before origin}}
test iocmd-28.17 {chan seek, bogus return, string return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return BOGUS}
    set c [chan create {r w} foo]
    note [catch {seek $c 0 start} msg]; note $msg
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 {expected integer but got "BOGUS"}}
test iocmd-28.18 {chan seek, ok result} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return 23}
    set c [chan create {r w} foo]
    note [seek $c 0 current]
    close $c
    rename foo {}
    set res
} -result {{seek rc* 0 current} {}}
foreach {testname code} {
    iocmd-28.19.0 start
    iocmd-28.19.1 current
    iocmd-28.19.2 end
} {
    test $testname "chan seek, base conversion, $code" -match glob -body {
	set res {}
	proc foo {args} {oninit seek; onfinal; track; return 0}
	set c [chan create {r w} foo]
	note [seek $c 0 $code]
	close $c
	rename foo {}
	set res
    } -result [list [list seek rc* 0 $code] {}]
}

# --- === *** ###########################
# method blocking

test iocmd-29.1 {chan blocking, no handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    note [fconfigure $c -blocking]
    close $c
    rename foo {}
    set res
} -result {1}
test iocmd-29.2 {chan blocking, no handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    note [fconfigure $c -blocking 0]
    note [fconfigure $c -blocking]
    close $c
    rename foo {}
    set res
} -result {{} 0}
test iocmd-29.3 {chan blocking, retrieval, handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    note [fconfigure $c -blocking]
    close $c
    rename foo {}
    set res
} -result {1}
test iocmd-29.4 {chan blocking, resetting, handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return}
    set c [chan create {r w} foo]
    note [fconfigure $c -blocking 0]
    note [fconfigure $c -blocking]
    close $c
    rename foo {}
    set res
} -result {{blocking rc* 0} {} 0}
test iocmd-29.5 {chan blocking, setting, handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return}
    set c [chan create {r w} foo]
    note [fconfigure $c -blocking 1]
    note [fconfigure $c -blocking]
    close $c
    rename foo {}
    set res
} -result {{blocking rc* 1} {} 1}
test iocmd-29.6 {chan blocking, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; error BOOM!}
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -blocking 0} msg]; note $msg
    # Catch the close. It changes blocking mode internally, and runs into the error result.
    catch {close $c}
    rename foo {}
    set res
} -result {{blocking rc* 0} 1 BOOM!}
test iocmd-29.7 {chan blocking, break return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return -code break BOOM!}
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -blocking 0} msg]; note $msg
    catch {close $c}
    rename foo {}
    set res
} -result {{blocking rc* 0} 1 *bad code*}
test iocmd-29.8 {chan blocking, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return -code continue BOOM!}
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -blocking 0} msg]; note $msg
    catch {close $c}
    rename foo {}
    set res
} -result {{blocking rc* 0} 1 *bad code*}
test iocmd-29.9 {chan blocking, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return -code 44 BOOM!}
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -blocking 0} msg]; note $msg
    catch {close $c}
    rename foo {}
    set res
} -result {{blocking rc* 0} 1 *bad code*}
test iocmd-29.10 {chan blocking, level is ignored} -match glob -setup {
    set res {}
} -body {
    proc foo {args} {oninit blocking; onfinal; track; return -level 99 -code 44 BANG}
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -blocking 0} msg opt]; note $msg; noteOpts $opt
    catch {close $c}
    return $res
} -cleanup {
    rename foo {}
} -result {{blocking rc* 0} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "blocking"*}}
test iocmd-29.11 {chan blocking, regular return ok, value ignored} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return BOGUS}
    set c [chan create {r w} foo]
    note [catch {fconfigure $c -blocking 0} msg]; note $msg
    catch {close $c}
    rename foo {}
    set res
} -result {{blocking rc* 0} 0 {}}

# --- === *** ###########################
# method watch

test iocmd-30.1 {chan watch, read interest, some return} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return IGNORED}
    set c [chan create {r w} foo]
    note [fileevent $c readable {set tick $tick}]
    close $c			;# 2nd watch, interest zero.
    rename foo {}
    set res
} -result {{watch rc* read} {} {watch rc* {}}}
test iocmd-30.2 {chan watch, write interest, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code error BOOM!_IGNORED}
    set c [chan create {r w} foo]
    note [fileevent $c writable {set tick $tick}]
    note [fileevent $c writable {}]
    close $c
    rename foo {}
    set res
} -result {{watch rc* write} {} {watch rc* {}} {}}
test iocmd-30.3 {chan watch, accumulated interests} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    note [fileevent $c writable {set tick $tick}]
    note [fileevent $c readable {set tick $tick}]
    note [fileevent $c writable {}]
    note [fileevent $c readable {}]
    close $c
    rename foo {}
    set res
} -result {{watch rc* write} {} {watch rc* {read write}} {} {watch rc* read} {} {watch rc* {}} {}}
test iocmd-30.4 {chan watch, unchanged interest not forwarded} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    note [fileevent $c writable {set tick $tick}]
    note [fileevent $c readable {set tick $tick}] ;# Script is changing,
    note [fileevent $c readable {set tock $tock}] ;# interest does not.
    close $c		;# 3rd and 4th watch, removing the event handlers.
    rename foo {}
    set res
} -result {{watch rc* write} {} {watch rc* {read write}} {} {} {watch rc* write} {watch rc* {}}}

# --- === *** ###########################
# chan postevent

test iocmd-31.1 {chan postevent, restricted to reflected channels} -match glob -body {
    set c [open [makeFile {} goo] r]
    catch {chan postevent $c {r w}} msg
    close $c
    removeFile goo
    set msg
} -result {can not find reflected channel named "file*"}
test iocmd-31.2 {chan postevent, unwanted events} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    catch {chan postevent $c {r w}} msg; note $msg
    close $c
    rename foo {}
    set res
} -result {{tried to post events channel "rc*" is not interested in}}
test iocmd-31.3 {chan postevent, bad input, empty list} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    catch {chan postevent $c {}} msg; note $msg
    close $c
    rename foo {}
    set res
} -result {{bad event list: is empty}}
test iocmd-31.4 {chan postevent, bad input, illlegal keyword} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    catch {chan postevent $c goo} msg; note $msg
    close $c
    rename foo {}
    set res
} -result {{bad event "goo": must be read or write}}
test iocmd-31.5 {chan postevent, bad input, not a list} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    catch {chan postevent $c "\{"} msg; note $msg
    close $c
    rename foo {}
    set res
} -result {{unmatched open brace in list}}
test iocmd-31.6 {chan postevent, posted events do happen} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    set tock {}
    note [fileevent $c readable {lappend res TOCK; set tock 1}]
    set stop [after 15000 {lappend res TIMEOUT; set tock 1}]
    after  1000 {note [chan postevent $c r]}
    vwait ::tock
    catch {after cancel $stop}
    close $c
    rename foo {}
    set res
} -result {{watch rc* read} {} {} TOCK {watch rc* {}}}
test iocmd-31.7 {chan postevent, posted events do happen} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    note [fileevent $c writable {lappend res TOCK; set tock 1}]
    set stop [after 15000 {lappend res TIMEOUT; set tock 1}]
    after  1000 {note [chan postevent $c w]}
    vwait ::tock
    catch {after cancel $stop}
    close $c
    rename foo {}
    set res
} -result {{watch rc* write} {} {} TOCK {watch rc* {}}}
test iocmd-31.8 {chan postevent after close throws error} -match glob -setup {
    proc foo {args} {oninit; onfinal; track; return}
    proc dummy args { return }
    set c [chan create {r w} foo]
    fileevent $c readable dummy
} -body {
    close $c
    chan postevent $c read
} -cleanup {
    rename foo   {}
    rename dummy {}
} -returnCodes error -result {can not find reflected channel named "rc*"}
test iocmd-31.9 {
    chan postevent

    call to current coroutine

    see 67a5eabbd3d1
} -match glob -body {
    set res {}
    proc foo {args} {oninit; onwatch; onfinal; track; return}
    set c [chan create {r w} foo]
    after 0 [list ::apply [list c {
	coroutine c1 ::apply [list c {
	    chan event $c readable [list [info coroutine]]
	    yield
	    set ::done READING
	} [namespace current]] $c
    } [namespace current]] $c]
    set stop [after 10000 {set done TIMEOUT}]
    vwait ::done
    catch {after cancel $stop}
    lappend res $done
    close $c
    rename foo {}
    set res
} -result {{watch rc* read} READING {watch rc* {}}}

# --- === *** ###########################
# 'Pull the rug' tests. Create channel in a interpreter A, move to
# other interpreter B, destroy the origin interpreter (A) before or
# during access from B. Must not crash, must return proper errors.

test iocmd-32.0 {origin interpreter of moved channel gone} -match glob -body {

    set ida [interp create];#puts <<$ida>>
    set idb [interp create];#puts <<$idb>>

    # Magic to get the test* commands in the children
    load {} Tcltest $ida
    load {} Tcltest $idb

    # Set up channel in interpreter
    interp eval $ida $helperscript
    set chan [interp eval $ida {
	proc foo {args} {oninit seek; onfinal; track; return}
	set chan [chan create {r w} foo]
	fconfigure $chan -buffering none
	set chan
    }]

    # Move channel to 2nd interpreter.
    interp eval $ida [list testchannel cut    $chan]
    interp eval $idb [list testchannel splice $chan]

    # Kill origin interpreter, then access channel from 2nd interpreter.
    interp delete $ida

    set     res {}
    lappend res [catch {interp eval $idb [list puts  $chan shoo]} msg] $msg
    lappend res [catch {interp eval $idb [list tell  $chan]}      msg] $msg
    lappend res [catch {interp eval $idb [list seek  $chan 1]}    msg] $msg
    lappend res [catch {interp eval $idb [list gets  $chan]}      msg] $msg
    lappend res [catch {interp eval $idb [list close $chan]}      msg] $msg
    set res

} -cleanup {
    interp delete $idb
} -constraints {testchannel} \
    -result {1 {Owner lost} 1 {Owner lost} 1 {Owner lost} 1 {Owner lost} 1 {Owner lost}}

test iocmd-32.1 {origin interpreter of moved channel destroyed during access} -match glob -body {

    set ida [interp create];#puts <<$ida>>
    set idb [interp create];#puts <<$idb>>

    # Magic to get the test* commands in the children
    load {} Tcltest $ida
    load {} Tcltest $idb

    # Set up channel in thread
    set chan [interp eval $ida $helperscript]
    set chan [interp eval $ida {
	proc foo {args} {
	    oninit; onfinal; track;
	    # destroy interpreter during channel access
	    suicide
	}
	set chan [chan create {r w} foo]
	fconfigure $chan -buffering none
	set chan
    }]
    interp alias $ida suicide {} interp delete $ida

    # Move channel to 2nd thread.
    interp eval $ida [list testchannel cut    $chan]
    interp eval $idb [list testchannel splice $chan]

    # Run access from interpreter B, this will give us a synchronous
    # response.

    interp eval $idb [list set chan $chan]
    set res [interp eval $idb {
	# wait a bit, give the main thread the time to start its event
	# loop to wait for the response from B
	after 2000
	catch { puts $chan shoo } res
	set res
    }]
    set res
} -cleanup {
    interp delete $idb
} -constraints {testchannel} -result {Owner lost}

test iocmd-32.2 {delete interp of reflected chan} {
    # Bug 3034840
    # Run this test in an interp with memory debugging to panic
    # on the double free
    interp create child
    child eval {
        proc no-op args {}
        proc driver {sub args} {return {initialize finalize watch read}}
        chan event [chan create read driver] readable no-op
    }
    interp delete child
} {}

# ### ### ### ######### ######### #########
## Same tests as above, but exercising the code forwarding and
## receiving driver operations to the originator thread.

# -*- tcl -*-
# ### ### ### ######### ######### #########
## Testing the reflected channel (Thread forwarding).
#
## The id numbers refer to the original test without thread
## forwarding, and gaps due to tests not applicable to forwarding are
## left to keep this asociation.

# ### ### ### ######### ######### #########
## Helper command. Runs a script in a separate thread and returns the
## result. A channel is transfered into the thread as well, and list of
## configuation variables

proc inthread {chan script args} {
    # Test thread.

    set tid [thread::create -preserved]
    thread::send $tid {load {} Tcltest}

    # Init thread configuration.
    # - Listed variables
    # - Id of main thread
    # - A number of helper commands

    foreach v $args {
	upvar 1 $v x
	thread::send $tid [list set $v $x]

    }
    thread::send $tid [list set mid [thread::id]]
    thread::send $tid {
	proc note {item} {global notes; lappend notes $item}
	proc notes {} {global notes; return $notes}
	proc noteOpts opts {global notes; lappend notes [dict merge {
	    -code !?! -level !?! -errorcode !?! -errorline !?! -errorinfo !?!
	} $opts]}
    }
    thread::send $tid [list proc s {} [list uplevel 1 $script]]; # (*)

    # Transfer channel (cut/splice aka detach/attach)

    testchannel cut $chan
    thread::send $tid [list testchannel splice $chan]

    # Run test script, also run local event loop!
    # The local event loop waits for the result to come back.
    # It is also necessary for the execution of forwarded channel
    # operations.

    set ::tres ""
    thread::send -async $tid {
	after 500
	catch {s} res; # This runs the script, 's' was defined at (*)
	thread::send -async $mid [list set ::tres $res]
    }
    vwait ::tres
    # Remove test thread, and return the captured result.

    thread::release $tid
    return $::tres
}

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

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

test iocmd.tf-22.2 {chan finalize, for close} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return {}}
    note [set c [chan create {r w} foo]]
    note [inthread $c {
	close $c
	# Close the deleted the channel.
	file channels rc*
    } c]
    # Channel destruction does not kill handler command!
    note [info command foo]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{initialize rc* {read write}} rc* {finalize rc*} {} foo}
test iocmd.tf-22.3 {chan finalize, for close, error, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return -code error 5}
    note [set c [chan create {r w} foo]]
    notes [inthread $c {
	note [catch {close $c} msg]; note $msg
	# Channel is gone despite error.
	note [file channels rc*]
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 5 {}}
test iocmd.tf-22.4 {chan finalize, for close, error, close errror} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; error FOO}
    note [set c [chan create {r w} foo]]
    notes [inthread $c {
	note [catch {close $c} msg]; note $msg
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 FOO}
test iocmd.tf-22.5 {chan finalize, for close, arbitrary result} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return SOMETHING}
    note [set c [chan create {r w} foo]]
    notes [inthread $c {
	note [catch {close $c} msg]; note $msg
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{initialize rc* {read write}} rc* {finalize rc*} 0 {}}
test iocmd.tf-22.6 {chan finalize, for close, break, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return -code 3}
    note [set c [chan create {r w} foo]]
    notes [inthread $c {
	note [catch {close $c} msg]; note $msg
	notes
    } c]
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-22.7 {chan finalize, for close, continue, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return -code 4}
    note [set c [chan create {r w} foo]]
    notes [inthread $c {
	note [catch {close $c} msg]; note $msg
	notes
    } c]
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-22.8 {chan finalize, for close, custom code, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return -code 777 BANG}
    note [set c [chan create {r w} foo]]
    notes [inthread $c {
	note [catch {close $c} msg]; note $msg
	notes
    } c]
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-22.9 {chan finalize, for close, ignore level, close error} -match glob -body {
    set res {}
    proc foo {args} {track; oninit; return -level 5 -code 777 BANG}
    note [set c [chan create {r w} foo]]
    notes [inthread $c {
	note [catch {close $c} msg opt]; note $msg; noteOpts $opt
	notes
    } c]
    rename foo {}
    set res
} -result {{initialize rc* {read write}} rc* {finalize rc*} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "finalize"*}} \
    -constraints {testchannel thread}

# --- === *** ###########################
# method read

test iocmd.tf-23.1 {chan read, regular data return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return snarf
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [read $c 10]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{read rc* 4096} {read rc* 4096} snarfsnarf}
test iocmd.tf-23.2 {chan read, bad data return, to much} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return [string repeat snarf 1000]
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {[read $c 2]} msg]; note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{read rc* 4096} 1 {read delivered more than requested}}
test iocmd.tf-23.3 {chan read, for non-readable channel} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track; note MUST_NOT_HAPPEN
    }
    set c [chan create {w} foo]
    notes [inthread $c {
	note [catch {[read $c 2]} msg]; note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {1 {channel "rc*" wasn't opened for reading}}
test iocmd.tf-23.4 {chan read, error return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {read $c 2} msg]; note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{read rc* 4096} 1 BOOM!} \
    -constraints {testchannel thread}
test iocmd.tf-23.5 {chan read, break return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -code break BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {read $c 2} msg]; note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{read rc* 4096} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-23.6 {chan read, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -code continue BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {read $c 2} msg]; note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{read rc* 4096} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-23.7 {chan read, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -code 777 BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {read $c 2} msg]; note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{read rc* 4096} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-23.8 {chan read, level is squashed} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return -level 55 -code 777 BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {read $c 2} msg opt]; note $msg; noteOpts $opt
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{read rc* 4096} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "read"*}} \
    -constraints {testchannel thread}
test iocmd.tf-23.9 {chan read, no data means eof} -match glob -setup {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return ""
    }
    set c [chan create {r w} foo]
} -body {
    notes [inthread $c {
	note [read $c 2]
	note [eof $c]
	close $c
	notes
    } c]
    set res
} -cleanup {
    rename foo {}
    unset res
} -result {{read rc* 4096} {} 1} \
    -constraints {testchannel thread}
test iocmd.tf-23.10 {chan read, EAGAIN means no data, yet no eof either} -match glob -setup {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	error EAGAIN
    }
    set c [chan create {r w} foo]
} -body {
    notes [inthread $c {
	note [read $c 2]
	note [eof $c]
	close $c
	notes
    } c]
    set res
} -cleanup {
    rename foo {}
    unset res
} -result {{read rc* 4096} {} 0} \
    -constraints {testchannel thread}

# --- === *** ###########################
# method write

test iocmd.tf-24.1 {chan write, regular write} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	set     written [string length [lindex $args 2]]
	note   $written
	return $written
    }
    set c [chan create {r w} foo]
    inthread $c {
	puts -nonewline $c snarf; flush $c
	close $c
    } c
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{write rc* snarf} 5}
test iocmd.tf-24.2 {chan write, ack partial writes} -match glob -body {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	set     written [string length [lindex $args 2]]
	if {$written > 10} {set written [expr {$written / 2}]}
	note   $written
	return $written
    }
    set c [chan create {r w} foo]
    inthread $c {
	puts -nonewline $c snarfsnarfsnarf; flush $c
	close $c
    } c
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{write rc* snarfsnarfsnarf} 7 {write rc* arfsnarf} 8}
test iocmd.tf-24.3 {chan write, failed write} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note -1; return -1}
    set c [chan create {r w} foo]
    inthread $c {
	puts -nonewline $c snarfsnarfsnarf; flush $c
	close $c
    } c
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{write rc* snarfsnarfsnarf} -1}
test iocmd.tf-24.4 {chan write, non-writable channel} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {1 {channel "rc*" wasn't opened for writing}}
test iocmd.tf-24.5 {chan write, bad result, more written than data} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return 10000}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarf; flush $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{write rc* snarf} 1 {write wrote more than requested}}
test iocmd.tf-24.6 {chan write, zero writes} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return 0}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarf; flush $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{write rc* snarf} 1 {write wrote more than requested}}
test iocmd.tf-24.7 {chan write, failed write, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code error BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 BOOM!} \
    -constraints {testchannel thread}
test iocmd.tf-24.8 {chan write, failed write, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; error BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 BOOM!} \
    -constraints {testchannel thread}
test iocmd.tf-24.9 {chan write, failed write, break return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code break BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-24.10 {chan write, failed write, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code continue BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-24.11 {chan write, failed write, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code 777 BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-24.12 {chan write, failed write, non-numeric return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return BANG}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 {expected integer but got "BANG"}} \
    -constraints {testchannel thread}
test iocmd.tf-24.13 {chan write, failed write, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -level 55 -code 777 BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {puts -nonewline $c snarfsnarfsnarf; flush $c} msg opt]
	note $msg
	noteOpts $opt
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{write rc* snarfsnarfsnarf} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "write"*}} \
    -constraints {testchannel thread}
test iocmd.tf-24.14 {chan write, no EAGAIN means that writing is allowed at this time, bug 2936225} -match glob -setup {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	return 3
    }
    set c [chan create {r w} foo]
} -body {
    notes [inthread $c {
	note [puts -nonewline $c ABC ; flush $c]
	close $c
	notes
    } c]
    set res
} -cleanup {
    rename foo {}
    unset res
} -result {{write rc* ABC} {}} \
    -constraints {testchannel thread}
test iocmd.tf-24.15 {chan write, EAGAIN means that writing is not allowed at this time, bug 2936225} -match glob -setup {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	# Note: The EAGAIN signals that the channel cannot accept
	# write requests right now, this in turn causes the IO core to
	# request the generation of writable events (see expected
	# result below, and compare to case 24.14 above).
	error EAGAIN
    }
    set c [chan create {r w} foo]
} -body {
    notes [inthread $c {
	note [puts -nonewline $c ABC ; flush $c]
	close $c
	notes
    } c]
    set res
} -cleanup {
    proc foo {args} {onfinal; set ::done-24.15 1; return 3}
    after 1000 {set ::done-24.15 2}
    vwait done-24.15
    rename foo {}
    unset res
} -result {{write rc* ABC} {watch rc* write} {}} \
    -constraints {testchannel thread}

test iocmd.tf-24.16 {chan write, note the background flush setup by close due to the EAGAIN leaving data in buffers.} -match glob -setup {
    set res {}
    proc foo {args} {
	oninit; onfinal; track
	# Note: The EAGAIN signals that the channel cannot accept
	# write requests right now, this in turn causes the IO core to
	# request the generation of writable events (see expected
	# result below, and compare to case 24.14 above).
	error EAGAIN
    }
    set c [chan create {r w} foo]
} -body {
    notes [inthread $c {
	note [puts -nonewline $c ABC ; flush $c]
	close $c
	notes
    } c]
    # Replace handler with all-tracking one which doesn't error.
    # This will tell us if a write-due-flush is there.
    proc foo {args} { onfinal; note BG ; track ; set ::endbody-24.16 1}
    # Flush (sic!) the event-queue to capture the write from a
    # BG-flush.
    after 1000 {set ::endbody-24.16 2}
    vwait endbody-24.16
    set res
} -cleanup {
    proc foo {args} {onfinal; set ::done-24.16 1; return 3}
    after 1000 {set ::done-24.16 2}
    vwait done-24.16
    rename foo {}
    unset res
} -result {{write rc* ABC} {watch rc* write} {} BG {write rc* ABC}} \
    -constraints {testchannel thread}

test iocmd.tf-24.17.bug3522560 {postevent for transfered channel} \
    -constraints {testchannel thread} -setup {
    # This test exposes how the execution of postevent in the handler thread causes
    # a crash if we are not properly injecting the events into the owning thread instead.
    # With the injection the test will simply complete without crash.

    set beat 10000
    set drive 999
    set data ...---...

    proc LOG {text} {
	#puts stderr "[thread::id]: $text"
	return
    }

    proc POST {hi} {
	LOG "-> [info level 0]"
	chan postevent $hi read
	LOG "<- [info level 0]"

	set ::timer [after $::drive [info level 0]]
	return
    }

    proc HANDLER {op ch args} {
	lappend ::res [lrange [info level 0] 1 end]
	LOG "-> [info level 0]"
	set ret {}
	switch -glob -- $op {
	    init* {set ret {initialize finalize watch read}}
	    watch {
		set l [lindex $args 0]
		catch {after cancel $::timer}
		if {[llength $l]} {
		    set ::timer [after $::drive [list POST $ch]]
		}
	    }
	    finalize {
		catch { after cancel $::timer }
		after 500 {set ::forever now}
	    }
	    read {
		set ret $::data
		set ::data {} ; # Next is EOF.
	    }
	}
	LOG "<- [info level 0] : $ret"
	return $ret
    }
} -body {
    LOG BEGIN
    set ch [chan create {read} HANDLER]

    set tid [thread::create {
	proc LOG {text} {
	    #puts stderr "\t\t\t\t\t\t[thread::id]: $text"
	    return
	}
	LOG THREAD-STARTED
	load {} Tcltest
	proc bgerror s {
	    LOG BGERROR:$s
	}
	vwait forever
	LOG THREAD-DONE
    }]

    testchannel cut $ch
    thread::send $tid [list set thech $ch]
    thread::send $tid [list set beat $beat]
    thread::send -async $tid {
	LOG SPLICE-BEG
	testchannel splice $thech
	LOG SPLICE-END
	proc PROCESS {ch} {
	    LOG "-> [info level 0]"
	    if {[eof $ch]} {
		close $ch
		set ::done 1
		set c <<EOF>>
	    } else {
		set c [read $ch 1]
	    }
	    LOG "GOTCHAR: $c"
	    LOG "<- [info level 0]"
	}
	LOG THREAD-FILEEVENT
	fconfigure $thech -translation binary -blocking 0
	fileevent  $thech readable [list PROCESS $thech]
	LOG THREAD-NOEVENT-LOOP
	set done 0
	while {!$done} {
	    after $beat
	    LOG THREAD-HEARTBEAT
	    update
	}
	LOG THREAD-LOOP-DONE
	#thread::exit
	# Thread exits cause leaks;  Use clean thread shutdown
	set forever yourGirl
    }

    LOG MAIN_WAITING
    vwait forever
    LOG MAIN_DONE

    set res
} -cleanup {
    after cancel $::timer
    rename LOG {}
    rename POST {}
    rename HANDLER {}
    unset beat drive data forever res tid ch timer
} -match glob \
    -result {{initialize rc* read} {watch rc* read} {read rc* 4096} {watch rc* {}} {watch rc* read} {read rc* 4096} {watch rc* {}} {finalize rc*}}

# --- === *** ###########################
# method cgetall

test iocmd.tf-25.1 {chan configure, cgetall, standard options} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} \
    -result {{-blocking 1 -buffering full -buffersize 4096 -encoding * -eofchar {{} {}} -translation {auto *}}}
test iocmd.tf-25.2 {chan configure, cgetall, no options} -match glob -body {
    set res {}
    proc foo {args} {oninit cget cgetall; onfinal; track; return ""}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} \
    -result {{cgetall rc*} {-blocking 1 -buffering full -buffersize 4096 -encoding * -eofchar {{} {}} -translation {auto *}}}
test iocmd.tf-25.3 {chan configure, cgetall, regular result} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return "-bar foo -snarf x"
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} \
    -result {{cgetall rc*} {-blocking 1 -buffering full -buffersize 4096 -encoding * -eofchar {{} {}} -translation {auto *} -bar foo -snarf x}}
test iocmd.tf-25.4 {chan configure, cgetall, bad result, list of uneven length} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return "-bar"
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{cgetall rc*} 1 {Expected list with even number of elements, got 1 element instead}}
test iocmd.tf-25.5 {chan configure, cgetall, bad result, not a list} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return "\{"
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{cgetall rc*} 1 {unmatched open brace in list}}
test iocmd.tf-25.6 {chan configure, cgetall, error return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{cgetall rc*} 1 BOOM!}
test iocmd.tf-25.7 {chan configure, cgetall, break return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code break BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{cgetall rc*} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-25.8 {chan configure, cgetall, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code continue BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{cgetall rc*} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-25.9 {chan configure, cgetall, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code 777 BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{cgetall rc*} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-25.10 {chan configure, cgetall, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -level 55 -code 777 BANG
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c} msg opt]
	note $msg
	noteOpts $opt
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{cgetall rc*} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "cgetall"*}} \
    -constraints {testchannel thread}

# --- === *** ###########################
# method configure

test iocmd.tf-26.1 {chan configure, set standard option} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track; note MUST_NOT_HAPPEN; return
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c -translation lf]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{}}
test iocmd.tf-26.2 {chan configure, set option, error return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo bar} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{configure rc* -rc-foo bar} 1 BOOM!}
test iocmd.tf-26.3 {chan configure, set option, ok return} -match glob -body {
    set res {}
    proc foo {args} {oninit configure; onfinal; track; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c -rc-foo bar]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{configure rc* -rc-foo bar} {}}
test iocmd.tf-26.4 {chan configure, set option, break return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -code break BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo bar} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-26.5 {chan configure, set option, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -code continue BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo bar} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-26.6 {chan configure, set option, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -code 444 BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo bar} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-26.7 {chan configure, set option, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {
	oninit configure; onfinal; track
	return -level 55 -code 444 BANG
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo bar} msg opt]
	note $msg
	noteOpts $opt
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{configure rc* -rc-foo bar} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "configure"*}} \
    -constraints {testchannel thread}

# --- === *** ###########################
# method cget

test iocmd.tf-27.1 {chan configure, get option, ok return} -match glob -body {
    set res {}
    proc foo {args} {oninit cget cgetall; onfinal; track; return foo}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c -rc-foo]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{cget rc* -rc-foo} foo}
test iocmd.tf-27.2 {chan configure, get option, error return} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{cget rc* -rc-foo} 1 BOOM!}
test iocmd.tf-27.3 {chan configure, get option, break return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code error BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} 1 BOOM!} \
    -constraints {testchannel thread}
test iocmd.tf-27.4 {chan configure, get option, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code continue BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-27.5 {chan configure, get option, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -code 333 BOOM!
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-27.6 {chan configure, get option, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {
	oninit cget cgetall; onfinal; track
	return -level 77 -code 333 BANG
    }
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -rc-foo} msg opt]
	note $msg
	noteOpts $opt
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{cget rc* -rc-foo} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "cget"*}} \
    -constraints {testchannel thread}

# --- === *** ###########################
# method seek

test iocmd.tf-28.1 {chan tell, not supported by handler} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [tell $c]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {-1} \
    -constraints {testchannel thread}
test iocmd.tf-28.2 {chan tell, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code error BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {tell $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 BOOM!} \
    -constraints {testchannel thread}
test iocmd.tf-28.3 {chan tell, break return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code break BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {tell $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-28.4 {chan tell, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code continue BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {tell $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-28.5 {chan tell, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code 222 BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {tell $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-28.6 {chan tell, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -level 11 -code 222 BANG}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {tell $c} msg opt]
	note $msg
	noteOpts $opt
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "seek"*}} \
    -constraints {testchannel thread}
test iocmd.tf-28.7 {chan tell, regular return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return 88}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [tell $c]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 current} 88} \
    -constraints {testchannel thread}
test iocmd.tf-28.8 {chan tell, negative return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -1}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {tell $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 {Tried to seek before origin}} \
    -constraints {testchannel thread}
test iocmd.tf-28.9 {chan tell, string return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return BOGUS}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {tell $c} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 current} 1 {expected integer but got "BOGUS"}} \
    -constraints {testchannel thread}
test iocmd.tf-28.10 {chan seek, not supported by handler} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {seek $c 0 start} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {1 {error during seek on "rc*": invalid argument}} \
    -constraints {testchannel thread}
test iocmd.tf-28.11 {chan seek, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code error BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {seek $c 0 start} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 BOOM!} \
    -constraints {testchannel thread}
test iocmd.tf-28.12 {chan seek, break return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code break BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {seek $c 0 start} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-28.13 {chan seek, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code continue BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {seek $c 0 start} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-28.14 {chan seek, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -code 99 BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {seek $c 0 start} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-28.15 {chan seek, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -level 33 -code 99 BANG}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {seek $c 0 start} msg opt]
	note $msg
	noteOpts $opt
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "seek"*}} \
    -constraints {testchannel thread}
test iocmd.tf-28.16 {chan seek, bogus return, negative location} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return -45}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {seek $c 0 start} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 {Tried to seek before origin}} \
    -constraints {testchannel thread}
test iocmd.tf-28.17 {chan seek, bogus return, string return} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return BOGUS}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {seek $c 0 start} msg]
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 start} 1 {expected integer but got "BOGUS"}} \
    -constraints {testchannel thread}
test iocmd.tf-28.18 {chan seek, ok result} -match glob -body {
    set res {}
    proc foo {args} {oninit seek; onfinal; track; return 23}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [seek $c 0 current]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{seek rc* 0 current} {}} \
    -constraints {testchannel thread}
foreach {testname code} {
    iocmd.tf-28.19.0 start
    iocmd.tf-28.19.1 current
    iocmd.tf-28.19.2 end
} {
    test $testname "chan seek, base conversion, $code" -match glob -body {
	set res {}
	proc foo {args} {oninit seek; onfinal; track; return 0}
	set c [chan create {r w} foo]
	notes [inthread $c {
	    note [seek $c 0 $code]
	    close $c
	    notes
	} c code]
	rename foo {}
	set res
    } -result [list [list seek rc* 0 $code] {}] \
	-constraints {testchannel thread}
}

# --- === *** ###########################
# method blocking

test iocmd.tf-29.1 {chan blocking, no handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c -blocking]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {1} \
    -constraints {testchannel thread}
test iocmd.tf-29.2 {chan blocking, no handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c -blocking 0]
	note [fconfigure $c -blocking]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{} 0} \
    -constraints {testchannel thread}
test iocmd.tf-29.3 {chan blocking, retrieval, handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; note MUST_NOT_HAPPEN; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c -blocking]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {1} \
    -constraints {testchannel thread}
test iocmd.tf-29.4 {chan blocking, resetting, handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c -blocking 0]
	note [fconfigure $c -blocking]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{blocking rc* 0} {} 0} \
    -constraints {testchannel thread}
test iocmd.tf-29.5 {chan blocking, setting, handler support} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fconfigure $c -blocking 1]
	note [fconfigure $c -blocking]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -result {{blocking rc* 1} {} 1} \
    -constraints {testchannel thread}
test iocmd.tf-29.6 {chan blocking, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; error BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -blocking 0} msg]
	note $msg
	# Catch the close. It changes blocking mode internally, and runs into the error result.
	catch {close $c}
	notes
    } c]
    rename foo {}
    set res
} -result {{blocking rc* 0} 1 BOOM!} \
    -constraints {testchannel thread}
test iocmd.tf-29.7 {chan blocking, break return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return -code break BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -blocking 0} msg]
	note $msg
	catch {close $c}
	notes
    } c]
    rename foo {}
    set res
} -result {{blocking rc* 0} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-29.8 {chan blocking, continue return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return -code continue BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -blocking 0} msg]
	note $msg
	catch {close $c}
	notes
    } c]
    rename foo {}
    set res
} -result {{blocking rc* 0} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-29.9 {chan blocking, custom return is error} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return -code 44 BOOM!}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -blocking 0} msg]
	note $msg
	catch {close $c}
	notes
    } c]
    rename foo {}
    set res
} -result {{blocking rc* 0} 1 *bad code*} \
    -constraints {testchannel thread}
test iocmd.tf-29.10 {chan blocking, level is ignored} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return -level 99 -code 44 BANG}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -blocking 0} msg opt]
	note $msg
	noteOpts $opt
	catch {close $c}
	notes
    } c]
    rename foo {}
    set res
} -result {{blocking rc* 0} 1 *bad code* {-code 1 -level 0 -errorcode NONE -errorline 1 -errorinfo *bad code*subcommand "blocking"*}} \
    -constraints {testchannel thread}
test iocmd.tf-29.11 {chan blocking, regular return ok, value ignored} -match glob -body {
    set res {}
    proc foo {args} {oninit blocking; onfinal; track; return BOGUS}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [catch {fconfigure $c -blocking 0} msg]
	note $msg
	catch {close $c}
	notes
    } c]
    rename foo {}
    set res
} -result {{blocking rc* 0} 0 {}} \
    -constraints {testchannel thread}

# --- === *** ###########################
# method watch

test iocmd.tf-30.1 {chan watch, read interest, some return} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return IGNORED}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fileevent $c readable {set tick $tick}]
	close $c		;# 2nd watch, interest zero.
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{watch rc* read} {watch rc* {}} {}}
test iocmd.tf-30.2 {chan watch, write interest, error return} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return -code error BOOM!_IGNORED}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fileevent $c writable {set tick $tick}]
	note [fileevent $c writable {}]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} -result {{watch rc* write} {watch rc* {}} {} {}}
test iocmd.tf-30.3 {chan watch, accumulated interests} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fileevent $c writable {set tick $tick}]
	note [fileevent $c readable {set tick $tick}]
	note [fileevent $c writable {}]
	note [fileevent $c readable {}]
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} \
    -result {{watch rc* write} {watch rc* {read write}} {watch rc* read} {watch rc* {}} {} {} {} {}}
test iocmd.tf-30.4 {chan watch, unchanged interest not forwarded} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	note [fileevent $c writable {set tick $tick}]
	note [fileevent $c readable {set tick $tick}] ;# Script is changing,
	note [fileevent $c readable {set tock $tock}] ;# interest does not.
	close $c	;# 3rd and 4th watch, removing the event handlers.
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} \
    -result {{watch rc* write} {watch rc* {read write}} {watch rc* write} {watch rc* {}} {} {} {}}

# --- === *** ###########################
# postevent
# Not possible from a thread not containing the command handler.
# Check that this is rejected.

test iocmd.tf-31.8 {chan postevent, bad input} -match glob -body {
    set res {}
    proc foo {args} {oninit; onfinal; track; return}
    set c [chan create {r w} foo]
    notes [inthread $c {
	catch {chan postevent $c r} msg
	note $msg
	close $c
	notes
    } c]
    rename foo {}
    set res
} -constraints {testchannel thread} \
    -result {{can not find reflected channel named "rc*"}}

# --- === *** ###########################
# 'Pull the rug' tests. Create channel in a thread A, move to other
# thread B, destroy the origin thread (A) before or during access from
# B. Must not crash, must return proper errors.

test iocmd.tf-32.0 {origin thread of moved channel gone} -match glob -body {

    #puts <<$tcltest::mainThread>>main
    set tida [thread::create -preserved];#puts <<$tida>>
    thread::send $tida {load {} Tcltest}

    set tidb [thread::create -preserved];#puts <<$tidb>>
    thread::send $tidb {load {} Tcltest}

    # Set up channel in thread
    thread::send $tida $helperscript
    set chan [thread::send $tida {
	proc foo {args} {oninit seek; onfinal; track; return}
	set chan [chan create {r w} foo]
	fconfigure $chan -buffering none
	set chan
    }]

    # Move channel to 2nd thread.
    thread::send $tida [list testchannel cut $chan]
    thread::send $tidb [list testchannel splice $chan]

    # Kill origin thread, then access channel from 2nd thread.
    thread::release $tida

    set     res {}
    lappend res [catch {thread::send $tidb [list puts  $chan shoo]} msg] $msg

    lappend res [catch {thread::send $tidb [list tell  $chan]}      msg] $msg
    lappend res [catch {thread::send $tidb [list seek  $chan 1]}    msg] $msg
    lappend res [catch {thread::send $tidb [list gets  $chan]}      msg] $msg
    lappend res [catch {thread::send $tidb [list close $chan]}      msg] $msg
    thread::release $tidb
    set res

} -constraints {testchannel thread} \
    -result {1 {Owner lost} 1 {Owner lost} 1 {Owner lost} 1 {Owner lost} 1 {Owner lost}}


# The test iocmd.tf-32.1 unavoidably exhibits a memory leak.  We are testing
# the ability of the reflected channel system to react to the situation where
# the thread in which the driver routines runs exits during driver operations.
# In this case, thread exit handlers signal back to the owner thread so that the
# channel operation does not hang.  There's no way to test this without actually
# exiting a thread in mid-operation, and that action is unavoidably leaky (which
# is why [thread::exit] is advised against).
#
# Use constraints to skip this test while valgrinding so this expected leak
# doesn't prevent a finding of "leak-free".
#
test iocmd.tf-32.1 {origin thread of moved channel destroyed during access} -match glob -body {

    #puts <<$tcltest::mainThread>>main
    set tida [thread::create -preserved];#puts <<$tida>>
    thread::send $tida {load {} Tcltest}
    set tidb [thread::create -preserved];#puts <<$tidb>>
    thread::send $tidb {load {} Tcltest}

    # Set up channel in thread
    thread::send $tida $helperscript
    set chan [thread::send $tida {
	proc foo {args} {
	    oninit; onfinal; track;
	    # destroy thread during channel access
	    thread::exit
	    }
	set chan [chan create {r w} foo]
	fconfigure $chan -buffering none
	set chan
    }]

    # Move channel to 2nd thread.
    thread::send $tida [list testchannel cut    $chan]
    thread::send $tidb [list testchannel splice $chan]

    # Run access from thread B, wait for response from A (A is not
    # using event loop at this point, so the event pile up in the
    # queue.

    thread::send $tidb [list set chan $chan]
    thread::send $tidb [list set mid [thread::id]]
    thread::send -async $tidb {
	# wait a bit, give the main thread the time to start its event
	# loop to wait for the response from B
	after 2000
	catch { puts $chan shoo } res
	thread::send -async $mid [list set ::res $res]
    }
    vwait ::res

    catch {thread::release $tida}
    thread::release $tidb
    set res
} -constraints {testchannel thread notValgrind} \
    -result {Owner lost}

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

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

rename track {}
# cleanup


# Eliminate valgrind "still reachable" reports on outstanding "Detached"
# structures in the detached list which stem from PipeClose2Proc not waiting
# around for background processes to complete, meaning that previous calls to
# Tcl_ReapDetachedProcs might not have had a chance to reap all processes.
after 10
exec [info nameofexecutable] << {}


foreach file [list test1 test2 test3 test4] {
    removeFile $file
}
# delay long enough for background processes to finish
after 500
removeFile test5
cleanupTests
return