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It seems as though the following calls do what you’d expect (close the stream and not allow any further input – anything waiting for input on the stream returns error), but is it guaranteed to be correct across all compilers/platforms?
close(fileno(stdin)); fclose(stdin);
Nothing is guaranteed correct across every possible operating system. However, calling fclose(stdin) will work on any POSIX compliant operating system as well as Windows operating systems, so you should hit pretty much anything in general use at the moment.
As stated by the previous answer as well as my comment, there is no need to call close on the file handle. fclose() will properly close everything down for you.