[Rd] Ctrl-c crashes R when run as sudo (PR#7819)

[Manuel.A.Morales at williams.edu]

I tried to submit this in R, but not sure if it worked.

When running R as sudo, using ctrl-c dumps me to the command line.
Hitting exit to exit the terminal window results in R taking 100% of
resources.

I am using R-2.1.0 on Fedora Core 3.

Thanks.

Manuel