effort.py spews on Crtl-C (ros ticket #3088)

[ahendrix]

When I run effort.py and hit Ctrl-C, I get this:

{{{
^CStopped quick_effort_controller_16724093 successfully
Unloaded quick_effort_controller_16724093 successfully
Traceback (most recent call last):
File "./effort.py", line 82, in
main()
File "./effort.py", line 78, in main
effort = float(sys.stdin.readline().strip())
IOError: [Errno 4] Interrupted system call
}}}

There should be a cleaner output, or a better way of exiting.

trac data:

• Owner: sglaser
• Reporter: vpradeep
• Reported at: Tue Nov 10 15:21:42 2009
• URL: https://code.ros.org/trac/wg-ros-pkg/ticket/3088