Getting INSERT values on a trigger

I am trying to use a C function to get the values inputted for a given
row.  I have defined the trigger as:
CREATE TRIGGER test AFTER INSERT OR UPDATE OR DELETE on testrel FOR
EACH ROW EXECUTE PROCEDURE testfunc();

Now say if I do a 'INSERT INTO testrel VALUES('1','string');' how can I
grab the values for each field within testfunc() and act on them (in
this case spit them out to another file)?

I have read the docs and can't seem to find how to retrieve the
values...

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| Hitesh Patel                    |  Voice: (541) 759-3126     |
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perl -e 'print pack("B*", "0100100100100000011101000110100001" .
"101001011011100110101100100000010010010010000001100100011100" .
"100110000101101110011010110010000001110011011011110110110101" .
"100101001000000110001001100001011001000010000001001110011110" .
"010111000101110101011010010110110000001010");'