When using stdout/stderr it is no longer necessary to explicitly
close the streams for the program to terminate. The automatic
close is handled by always closing the associated receive port
for write only streams when not waiting for any events. If a
close or error handler is installed for stdout/stderr these will
still keep the program alive.
For stdin better handling of the difference between sockets and
pipes have been immplemented. As a special case for stdin when
reading from a terminal the a POLLIN signal with 0 available
bytes is treated as end-of-file. This will trigger when pressing
ctrl-d in a terminal as POLLHUP is not set in that situation.
R=ager@google.com
BUG=
TEST=
Review URL: http://codereview.chromium.org//8533005
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@1507 260f80e4-7a28-3924-810f-c04153c831b5
Sockets now supports being half-closed for either reading or writing. When a socket is closed it is by default closed for both read and write and the underlying file descriptor is destroyed. However the socket close can be asked to only half-close the socket to send end of stream to the other end and still have the ability to receive more data.
The close event on a socket is only emitted when the socket is closed by the other end. Both half-close and full-close by the other end is reported as a close event. If a socket is already half closed the close event will automatically destroy the socket.
The streams on the sockets also takes advantage of this. A socket input stream will report a close event when the other end closed. A socket output stream will half-close the socket when close is called making it possible to still receive data on the input stream. When both streams have been closed the socket is destroyed.
For sockets operating on pipes they are initially created as half-closed for either reading or writing depending on which type of pipe a socket object is based on. A pipe for writing will start half-closed for reading so if it is only half-closed for writing the socket will still be destroyed. Same with a pipe for reading that will start half-closed for writing and when a close event is received half-closing the other direction will destroy the socket. Socket objects based on pipes are only exposed through streams.
Extended the socket close test to test a number of different scenarios.
Also refactor the socket data C++ object to encapsulate more socket information and operations.
Now the Linux and Mac OS versions are 100% the same as it turned out that using POLLRDHUP on Linux was not required any more.
R=ager@google.com
BUG=
TEST=
Review URL: http://codereview.chromium.org//8437090
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@1196 260f80e4-7a28-3924-810f-c04153c831b5
This moved some of the handling of the data on a socket to a socket data object.
This is a step in preparation for another change where more state will be stored on socket data object.
This is also a step in moving from an array of socket data objects indexed by the file descriptor to a hash map of socket data objects.
R=ager@google.com
BUG=
TEST=
Review URL: http://codereview.chromium.org//8431027
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@1001 260f80e4-7a28-3924-810f-c04153c831b5
