diff options
| -rw-r--r-- | generic/tclIOGT.c | 15 | ||||
| -rw-r--r-- | tests/iogt.test | 74 |
2 files changed, 85 insertions, 4 deletions
diff --git a/generic/tclIOGT.c b/generic/tclIOGT.c index ca66d4d..58d1a22 100644 --- a/generic/tclIOGT.c +++ b/generic/tclIOGT.c @@ -187,6 +187,7 @@ struct TransformChannelData { Tcl_Channel self; /* Our own Channel handle. */ int readIsFlushed; /* Flag to note whether in.flushProc was * called or not. */ + int eofPending; /* Flag: EOF seen down, not raised up */ int flags; /* Currently CHANNEL_ASYNC or zero. */ int watchMask; /* Current watch/event/interest mask. */ int mode; /* Mode of parent channel, OR'ed combination @@ -292,6 +293,7 @@ TclChannelTransform( Tcl_DStringInit(&ds); Tcl_GetChannelOption(interp, chan, "-blocking", &ds); dataPtr->readIsFlushed = 0; + dataPtr->eofPending = 0; dataPtr->flags = 0; if (ds.string[0] == '0') { dataPtr->flags |= CHANNEL_ASYNC; @@ -624,7 +626,7 @@ TransformInputProc( if (toRead == 0 || dataPtr->self == NULL) { /* - * Catch a no-op. + * Catch a no-op. TODO: Is this a panic()? */ return 0; } @@ -676,8 +678,7 @@ TransformInputProc( if (toRead <= 0) { break; } - - if (dataPtr->readIsFlushed) { + if (dataPtr->eofPending) { /* * Already saw EOF from downChan; don't ask again. * NOTE: Could move this up to avoid the last maxRead @@ -723,6 +724,7 @@ TransformInputProc( * on the down channel. */ + dataPtr->eofPending = 1; dataPtr->readIsFlushed = 1; ExecuteCallback(dataPtr, NULL, A_FLUSH_READ, NULL, 0, TRANSMIT_IBUF, P_PRESERVE); @@ -750,8 +752,11 @@ TransformInputProc( break; } } /* while toRead > 0 */ - ReleaseData(dataPtr); + if (gotBytes == 0) { + dataPtr->eofPending = 0; + } + ReleaseData(dataPtr); return gotBytes; } @@ -862,6 +867,7 @@ TransformSeekProc( P_NO_PRESERVE); ResultClear(&dataPtr->result); dataPtr->readIsFlushed = 0; + dataPtr->eofPending = 0; } ReleaseData(dataPtr); @@ -935,6 +941,7 @@ TransformWideSeekProc( P_NO_PRESERVE); ResultClear(&dataPtr->result); dataPtr->readIsFlushed = 0; + dataPtr->eofPending = 0; } ReleaseData(dataPtr); diff --git a/tests/iogt.test b/tests/iogt.test index 6cc0542..1ed89f7 100644 --- a/tests/iogt.test +++ b/tests/iogt.test @@ -871,6 +871,80 @@ test iogt-6.1 {Push back and up} -constraints {testchannel knownBug} -body { close $f } -result {xxxghi} + +# Driver for a base channel that emits several short "files" +# with each terminated by a fleeting EOF + proc driver {cmd args} { + variable buffer + variable index + set chan [lindex $args 0] + switch -- $cmd { + initialize { + set index($chan) 0 + set buffer($chan) ..... + return {initialize finalize watch read} + } + finalize { + if {![info exists index($chan)]} {return} + unset index($chan) buffer($chan) + return + } + watch {} + read { + set n [lindex $args 1] + if {![info exists index($chan)]} { + driver initialize $chan + } + set new [expr {$index($chan) + $n}] + set result [string range $buffer($chan) $index($chan) $new-1] + set index($chan) $new + if {[string length $result] == 0} { + driver finalize $chan + } + return $result + } + } + } + +test iogt-7.0 {Handle fleeting EOF} -constraints {testchannel} -body { + set chan [chan create read [namespace which driver]] + identity -attach $chan + list [eof $chan] [read $chan] [eof $chan] [read $chan 0] [eof $chan] \ + [read $chan] [eof $chan] +} -cleanup { + close $chan +} -result {0 ..... 1 {} 0 ..... 1} + +proc delay {op data} { + variable store + switch -- $op { + create/write - create/read - + delete/write - delete/read - + flush/write - write - + clear_read {;#ignore} + flush/read - + read { + if {![info exists store]} {set store {}} + set reply $store + set store $data + return $reply + } + query/maxRead {return -1} + } +} + +test iogt-7.1 {Handle fleeting EOF} -constraints {testchannel} -body { + set chan [chan create read [namespace which driver]] + testchannel transform $chan -command [namespace code delay] + list [eof $chan] [read $chan] [eof $chan] [read $chan 0] [eof $chan] \ + [read $chan] [eof $chan] +} -cleanup { + close $chan +} -result {0 ..... 1 {} 0 ..... 1} + +rename delay {} +rename driver {} + # cleanup foreach file [list dummy dummyout __echo_srv__.tcl] { removeFile $file |