I´ve written some PostgreSQL C-Extensions (for the first time...) and they work as expected.
But now I want to call other functions from inside the C-Extensions (but not via SPI_execute), for example "regexp_match()" or from other extensions like PostGIS "ST_POINT" etc... I think "fmgr" is the key - but I didn't find any examples. Greetings from Berlin -Stefan Wolf-
