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C$ calls are generally independent of our COBOL drivers.
If you look in ctreeacu.c we implement the documented interface as required by AcuCOBOL. Note too, that while ACUCOBOL and ExtFH are similar, they are different standards and we have specifically implemented each. We are not using ExtFH for our AcuCOBOL support, rather, we directly implemented their documented dispatched file handler. C$ calls sit above that.
It is possible that some C$ commands map to a matching op code, however, this is not guaranteed.
In the lib/direct.c module, you will find provisions to implement custom C routines.
The c-treeRTG drivers do not provide any direct C$ operations.
