Any postgres API available to get errorcode for PQerrorMessage

HI,

PQerrorMessage pirints the error message like (no space available,etc). Does postgres provide

any  API which gives the error code listed in the below appendix;

http://www.postgresql.org/docs/9.1/static/errcodes-appendix.html

I need the exact error code so that I can shutdown my application whenever I face  the “no space available” problem.

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Thanks and Regards,

Rupesh