On slower Windows machines, waiting 0.1 seconds can sometimes not be
enough for a subprocess to start and be ready to accept signals, causing
the test to fail. One buildbot is also choking on input()/EOFError so
that was changed to not depend on input.
os.kill takes one of two newly added signals, CTRL_C_EVENT and
CTRL_BREAK_EVENT, or any integer value. The events are a special case
which work with subprocess console applications which implement a
special console control handler. Any other value but those two will
cause os.kill to use TerminateProcess, outright killing the process.
This change adds win_console_handler.py, which is a script to implement
SetConsoleCtrlHandler and applicable handler function, using ctypes.
subprocess also gets another attribute which is a necessary flag to
creationflags in Popen in order to send the CTRL events.
Brian Curtin
Benjamin Peterson