SVC_IO_GetReadBuffer
Returns the pointer to consecutive input buffer, chunks will be consolidated if required.
The user can then directly access the full input buffer via the pointer.
Synopsis
unsigned int SVC_IO_GetReadBuffer(FmMsgHandle token, void **read_pointer);
Input requirements
read_pointer must be the address of a void * variable that will be assigned the read buffer address.
Output parameters
The function returns the number of bytes available in the read buffer.