Extend dart:io error handling to all socket functions

Extend dart:io error handling to all socket functions

There are currently no tests of the error handling, as it is hard to
create consistent tests. I have done some manual tests locally:

* Lowering the number of file descriptors available (ulimit -n) and hitting that limit
* Running two dart programs communicating and terminating one (using Ctrl-C)
* Running two dart programs communicating on two machines and pulling out the network cable.

If there is an error we always call the onError callback and never the onClosed callback.

On Windows there is the issue that both closing the connection correctly and terminating one end gives the same error (ERROR_NETNAME_DELETED) so both are reported as connection close. Pulling out the network cable gives a different (real) error on Windows though.

On Mac OS it turned out the for kqueue EV_EOF is also used to indicate errors with the error code set in the fflags field. EV_ERROR is only reported if there is an internal error in  kevent processing (see http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man2/kqueue.2.html).

R=ager@google.com

BUG=
TEST=

Committed: https://code.google.com/p/dart/source/detail?r=5709

[Mads Ager (google), 2012-03-20 15:11:58]

LGTM!

https://chromiumcodereview.appspot.com/9720045/diff/5001/runtime/bin/eventhan...
File runtime/bin/eventhandler_linux.cc (right):

https://chromiumcodereview.appspot.com/9720045/diff/5001/runtime/bin/eventhan...
runtime/bin/eventhandler_linux.cc:264: } else if (((events & EPOLLHUP) != 0)) {
Remove one set of parenthesis?

https://chromiumcodereview.appspot.com/9720045/diff/5001/runtime/bin/eventhan...
runtime/bin/eventhandler_linux.cc:267: if (((events & EPOLLERR) != 0)) {
Remove one set of parenthesis?

https://chromiumcodereview.appspot.com/9720045/diff/5001/runtime/bin/eventhan...
File runtime/bin/eventhandler_macos.cc (right):

https://chromiumcodereview.appspot.com/9720045/diff/5001/runtime/bin/eventhan...
runtime/bin/eventhandler_macos.cc:261: if (event->fflags != 0) {
Thanks!

[Søren Gjesse, 2012-03-21 09:33:36]

https://chromiumcodereview.appspot.com/9720045/diff/5001/runtime/bin/eventhan...
File runtime/bin/eventhandler_linux.cc (right):

https://chromiumcodereview.appspot.com/9720045/diff/5001/runtime/bin/eventhan...
runtime/bin/eventhandler_linux.cc:264: } else if (((events & EPOLLHUP) != 0)) {
On 2012/03/20 15:11:58, Mads Ager wrote:
> Remove one set of parenthesis?

Done.

https://chromiumcodereview.appspot.com/9720045/diff/5001/runtime/bin/eventhan...
runtime/bin/eventhandler_linux.cc:267: if (((events & EPOLLERR) != 0)) {
On 2012/03/20 15:11:58, Mads Ager wrote:
> Remove one set of parenthesis?

Done.