reg_int_cb-Register callback for a particular interrupt pin

Hi,

I want to use eMPL for Microchip platform. As it says on the libraries "inv_mpu.c" and "inv_mpu_dmp_motion_driver.c" it is necessary create a few functions.

One of them is:
reg_int_cb(void (*cb)(void), unsigned char port, unsigned char pin)

...but it don´t know exactly how to implement on PIC32 mcu´s and if it´s necessary. What i understood, this function is for use interrupts without specify which one is exactly.

Any help about this??
Thanks.