exception KeyboardInterrupt and os.system command

[jepler at unpythonic.net]

You can tell by the exit code from system() whether the subprocess
exited due to a signal.  Consider this code:
    import os
    while 1:
        print os.system("sleep 1")
unless you happen to hit ctrl-c at the right time, you'll see it print
"2" (and "0" when the sleep finishes).  The exit code can be interpreted
according to the waitpid manpage, though I am not sure where the Python
equivalent of the WIFSIGNALED and WTERMSIG macros are.

Jeff
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