/usr/share/texmf-texlive/metapost/support/charlib/ci is in texlive-metapost 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | % $Id: ci,v 1.2 2004/09/19 21:47:11 karl Exp $
% Public domain.
vardef C.ci(expr n) =
save p; picture p;
p=nullpicture;
addto p doublepath makepath pencircle shifted(.5,.5)
withpen pencircle scaled.0444;
p scaled(.75*fontsize n)
enddef;
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