Piping a file to Dart VM stdin never gets a close event

[sgjesse]

Running the following Dart program (test.dart)

main() {
  stdin.dataHandler = () { print(new String.fromCharCodes(stdin.read())); };
  stdin.closeHandler = () { print("close"); };
}

These two different ways

$ cat myfile | dart test.dart
$ dart test.dart < myfile

Only the first (using pipe) will print "close" and terminate.

If you know the Area- label, please set it and change status to Triaged.*

[sgjesse]

Running on Linux with DEBUG_POLL defined in eventhandler_linux.cc reveals the issue.

$ cat myfile | dart test.dart

0 POLLIN POLLHUP (available 1877)
0 POLLIN POLLHUP (available 1877)
<content of myfile>
0 POLLHUP (available 0)
close

$ dart test.dart < myfile

0 POLLIN (available 348)
0 POLLIN (available 348)
<content of myfile>
0 POLLIN (available 0)
0 POLLIN (available 0)
0 POLLIN (available 0)
0 POLLIN (available 0)
<loops with 0 POLLIN (available 0) forever>

When "<" piping is used POLLHUP is not set.

The same happens on mac OS (except that for "|" piping POLLIN is set together with POLLHUP on the last event with 0 bytes available.

[sgjesse]

Fixed in https://code.google.com/p/dart/source/detail?r=2311.

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Added Fixed label.