Fix a number of issues with determining the type of stdio

Fix a number of issues with determining the type of stdio

 * Fix checked mode exception when _getSocketType returns an OSError
 * Treat any character device as terminal (this includes /dev/null)
 * Fix detecting of file redirection af file
 * Don't turn an unkonwn device type into an OSError (wth value for an unknown was -1)

Expanded an existing test to catch some of this.

R=ager@google.com

BUG=https://code.google.com/p/dart/issues/detail?id=9637

Committed: https://code.google.com/p/dart/source/detail?r=20960

[Søren Gjesse, 2013-04-04 13:22:35]

On Windows all character devices was already reported as terminal (which is the
case for NUL).

[Mads Ager (google), 2013-04-05 05:34:28]

LGTM

https://codereview.chromium.org/13636003/diff/4001/runtime/bin/file_linux.cc
File runtime/bin/file_linux.cc (right):

https://codereview.chromium.org/13636003/diff/4001/runtime/bin/file_linux.cc#...
runtime/bin/file_linux.cc:1: // Copyright (c) 2013, the Dart project authors. 
Please see the AUTHORS file
Revert this file? Maybe disable the editor magic that does these updates for
you?

https://codereview.chromium.org/13636003/diff/4001/tests/standalone/io/dart_s...
File tests/standalone/io/dart_std_io_pipe_test.dart (right):

https://codereview.chromium.org/13636003/diff/4001/tests/standalone/io/dart_s...
tests/standalone/io/dart_std_io_pipe_test.dart:115: scriptFile = new
File("../tests/standalone/io/dart_std_io_pipe_script.dart");
long line

[Søren Gjesse, 2013-04-05 11:13:38]

Committed patchset #4 manually as r20960 (presubmit successful).

[Søren Gjesse, 2013-04-09 11:35:20]

https://codereview.chromium.org/13636003/diff/4001/runtime/bin/file_linux.cc
File runtime/bin/file_linux.cc (right):

https://codereview.chromium.org/13636003/diff/4001/runtime/bin/file_linux.cc#...
runtime/bin/file_linux.cc:1: // Copyright (c) 2013, the Dart project authors. 
Please see the AUTHORS file
On 2013/04/05 05:34:28, Mads Ager wrote:
> Revert this file? Maybe disable the editor magic that does these updates for
> you? 

Done.

https://codereview.chromium.org/13636003/diff/4001/tests/standalone/io/dart_s...
File tests/standalone/io/dart_std_io_pipe_test.dart (right):

https://codereview.chromium.org/13636003/diff/4001/tests/standalone/io/dart_s...
tests/standalone/io/dart_std_io_pipe_test.dart:115: scriptFile = new
File("../tests/standalone/io/dart_std_io_pipe_script.dart");
On 2013/04/05 05:34:28, Mads Ager wrote:
> long line

Done.