software functions availablity

I have a query, it would be of great help to me if you clarify the following.

  1. Does the below functions exist in QNX?

int mcRead(mcChan *Chan, unsigned char *Buffer, ReqSize) and

int mcWrite(mcChan *Chan, unsigned char *Buffer, Size)

void mcChanInit(mcDev *mcDevPtr, mcChan *Chan)

  1. If yes, Does these functions is to be called from the device driver or from the application ?

  2. If you have any example programs which uses these functions can you please send .

Appreciate your immediate response