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diff --git a/gears/services/devfile/devfile_guest_fd_tracker.h b/gears/services/devfile/devfile_guest_fd_tracker.h
new file mode 100644
index 0000000..27ef088
--- /dev/null
+++ b/gears/services/devfile/devfile_guest_fd_tracker.h
@@ -0,0 +1,129 @@
+/* 
+   Device File Virtualization Guest Preload Library Helpers
+
+   (c) Akhil Guliani and William Gross, 2015
+     
+   Adapted from MPI module (c) 2012 Peter Dinda
+
+*/
+
+#define MAX_DEV_NAME_LENGTH 80
+#define MAX_DEVICES 100
+
+//PYTHONSCRIPTBREAK1
+#define DEV_COUNT 9
+//PYTHONSCRIPTBREAK2
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <errno.h>
+
+
+
+#define MIN(a,b) \
+    ({ __typeof__ (a) _a = (a); \
+     __typeof__ (b) _b = (b); \
+     _a < _b ? _a : _b; })
+
+
+char *strcpy(char *dest, const char *src)
+{
+    unsigned i;
+    for (i=0; src[i] != '\0'; ++i)
+        dest[i] = src[i];
+    dest[i] = '\0';
+    return dest;
+}
+
+size_t strlen(const char * str)
+{
+    const char *s;
+    for (s = str; *s; ++s) {}
+    return(s - str);
+}
+
+
+//taken from: https://stuff.mit.edu/afs/sipb/project/tcl80/src/tcl8.0/compat/strstr.c
+char* strstr(const char* string,char* substring)
+    //    register char *string;  /* String to search. */
+    //    char *substring;        /* Substring to try to find in string. */
+{
+    register char *a, *b;
+
+    /* First scan quickly through the two strings looking for a
+     *      * single-character match.  When it's found, then compare the
+     *           * rest of the substring.
+     *                */
+
+    b = substring;
+    if (*b == 0) {
+        return (char*)string;
+    }
+    for ( ; *string != 0; string += 1) {
+        if (*string != *b) {
+            continue;
+        }
+        a = (char*)string;
+        while (1) {
+            if (*b == 0) {
+                return (char*)string;
+            }
+            if (*a++ != *b++) {
+                break;
+            }
+        }
+        b = substring;
+    }
+    return (char *) 0;
+}
+
+
+//Used to keep track of the active file descriptor for the supported devices
+//Initially the fd is -1 to indicate that the device has not yet been opened
+typedef struct dev_file_fd_tracker {
+    char devName[MAX_DEV_NAME_LENGTH];
+    int devFD;
+} dev_tracker;
+
+
+dev_tracker dtrack[] = {
+//PYTHONSCRIPTBREAK3
+{"/dev/urandom",-1},
+{"/dev/input/mouse0",-1},
+{"/dev/input/event0",-1},
+{"/dev/input/event1",-1},
+{"/dev/ttyS0",-1},
+{"/dev/ttyS1",-1},
+{"/dev/ttyS2",-1},
+{"/dev/ttyS3",-1},
+{"/dev/newDevice",-1}
+//PYTHONSCRIPTBREAK4
+
+};
+
+//returns -1, means no match is found
+//other than -1, is the index in the dtracker array of the match
+int check_name(const char* path, dev_tracker tracker[]){
+    int i;
+    for(i=0; i<DEV_COUNT; i++){
+        if (strstr(path,tracker[i].devName)!=NULL){
+            return i;
+        }
+    }
+    return -1;
+}
+//returns -1, means no match found
+//other than -1, is the index in the dtracker array of the match
+int check_fd(int fd, dev_tracker tracker[]){
+    int i;
+    for(i=0; i<DEV_COUNT; i++){
+        if(tracker[i].devFD == fd){
+            return i;
+        }
+    }
+    return -1;
+}
+
+
+