Added comments to RPi interrupt files.

utility/RPi/interrupt.c

+/*
+Interrupts functions extruded from wiringPi library by Oitzu.
+
+wiringPi Copyright (c) 2012 Gordon Henderson
+https://projects.drogon.net/raspberry-pi/wiringpi
+wiringPi is free software: GNU Lesser General Public License
+see <http://www.gnu.org/licenses/>
+*/
+
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>

utility/RPi/interrupt.h

 /*
 Interrupts functions extruded from wiringPi library by Oitzu.
+
+wiringPi Copyright (c) 2012 Gordon Henderson
+https://projects.drogon.net/raspberry-pi/wiringpi
+wiringPi is free software: GNU Lesser General Public License
+see <http://www.gnu.org/licenses/>
 */
 
 #include "RF24_arch_config.h"
@@ -9,13 +14,43 @@ Interrupts functions extruded from wiringPi library by Oitzu.
 #define INT_EDGE_RISING         2
 #define INT_EDGE_BOTH           3
 
+/*
+ * interruptHandler:
+ *      This is a thread and gets started to wait for the interrupt we're
+ *      hoping to catch. It will call the user-function when the interrupt
+ *      fires.
+ *********************************************************************************
+ */
 static void *interruptHandler (void *arg);
 
 #ifdef __cplusplus
 extern "C" {
 #endif
+/*
+ * waitForInterrupt:
+ *      Pi Specific.
+ *      Wait for Interrupt on a GPIO pin.
+ *      This is actually done via the /sys/class/gpio interface regardless of
+ *      the wiringPi access mode in-use. Maybe sometime it might get a better
+ *      way for a bit more efficiency.
+ *********************************************************************************
+ */
 extern int waitForInterrupt (int pin, int mS);
+
+/*
+ * piHiPri:
+ *      Attempt to set a high priority schedulling for the running program
+ *********************************************************************************
+ */
 extern int piHiPri (const int pri);
+
+/*
+ * attachInterrupt (Original: wiringPiISR):
+ *      Pi Specific.
+ *      Take the details and create an interrupt handler that will do a call-
+ *      back to the user supplied function.
+ *********************************************************************************
+ */
 extern int attachInterrupt (int pin, int mode, void (*function)(void));
 #ifdef __cplusplus
 }