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When using an interactive process started with Process.start you have to drain the stdout and stderr streams to make sure that all resources are freed. If you do that the dart:io library will make sure to free all system resources for you. R=sgjesse@google.com BUG= Review URL: https://codereview.chromium.org//11343009 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@14187 260f80e4-7a28-3924-810f-c04153c831b5