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I am Dave (Jing) Tian, an Associate Professor in the Department of Computer Science at Purdue University working on system security. My research involves embedded systems, operating systems, trusted and confidential computing, and hardware security. All opinions are my own.
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Category Archives: Programming
nex – Linux netlink programming for kernel and user spaces
There are ways to communicate with Linux kernel, including /proc, debugfs, syscall and etc. Most of them are unidirectional, from the kernel to the user space. /proc could be used to ‘write’ to the kernel but mostly in small data … Continue reading
relay – linux kernel relay filesystem
Relay (Relay filesystem) is a mechanisim used to transfer the data from the kernel space to the user space within the Linux OS. The advantage of relay comparing with other means like debugfs or proc is its ability to handle … Continue reading
Some pitfalls in Python ~ remove, recursion and sign
This post is the summary of some pitfalls of Python programming I have encountered. May it help:) 1. remove() List’s remove function is used to remove certain item from the list. However, remove function always removes the first item it … Continue reading
myssh – an interactive ssh management tool
Inspired by the putty manager on Windows system, I have spent the whole afternoon to write ‘myssh’ – an interactive ssh management tool providing the ability to save, display, choose and connect your ssh connection automatically. I am not sure … Continue reading
Pointer in Python
There is no pointers in Python but there are pointers in Python indeed. Among different kinds of pointer implementation in Python, this post demonstrate an elegant way to use pointers, especially object pointers when doing Python OOP. Detailed ‘ctypes’ module … Continue reading
Jython – Combination of Java and Python
This post is used for final project of CIS610 – Teaching Effectiveness in CIS dept at UO, dedicated to the students with background of CIS122 – Intro to Algorithms and Problem Solving Using Python. Background of Java is not mandatory … Continue reading
tmt – Tomcat monitor tool
Our Tomcat server sometimes crushes either process killed or no response from httpd. Before falling into the ‘long-term’ debugging, we have implemented ‘tmt’, which is used to moniter the status of Tomcat process and httpd by restarting the Tomcat timely. … Continue reading
Python learning – Sieve of Eratosthenes
Get all the information about ‘Sieve of Eratosthenes’ on wikipedia (http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes). This algorithm does tell us there should be some algorithms with better time complexcity or space complexcity. Fun! (pic took from Wikipedia) [daveti@aimlab python]$ cat sea.py #!/bin/env python # … Continue reading
Python learning – Caesar Cipher
Get all the information about the old, famous and interesing Caesar Cipher (http://en.wikipedia.org/wiki/Caeser_cipher). In this post we will implement the Caeser Cipher Encoder (cce.py), Caeser Cipher Decoder (ccd.py) and Caeser Cipher Brute Force Decipher (ccbfd.py). Have FUN:) (BTW, I have … Continue reading
Python learning – regular expression
Right now, I am a teaching assistent in University of Oregon (UO) for CIS-122 (Introduction to Programming and Algorithms Using Python). We would like our students to make full use of CScircles of CS department at University of Waterloo (http://cscircles.cemc.uwaterloo.ca/), … Continue reading
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