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Manu's Public Articles and Projects | articles.manugarg.com Reviews
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Articles : Manu's public articles
articles.manugarg.com
Backing up Windows machines using rsync and ssh
http://articles.manugarg.com/backup_rsync.html
Backing up Windows machines using rsync and ssh. Economical backup solution: rsync and ssh. Rsync daemon requires a configuration file rsyncd.conf. For my use, I have set it up like this:. Manu@amusbocldmon01 ]$ cat rsyncd.conf use chroot = no [backup] path = /backup read only = no comment = backup area. Do no chroot (required because I'll run it as a non-root user). Backup] specifies a module named backup. Backup is the path to backup module on filesystem. First, we need to start rsync daemon at the ser...
Procedure Call Sequence in C
http://articles.manugarg.com/stack.html
Procedure Call Sequence in C. When you call a function in C, you need to ensure mainly 5 things:. Store the returning address somewhere, so that we can continue executing the current function after completion of called function. Saving other information about current function. (Later, we'll see that it boils down to saving current frame pointer (EBP) somewhere.). Providing the callee with the parameters. Providing called function some space to store its automatic variables. Salient Features of Stack:.
Mighty Sockets
http://articles.manugarg.com/socket.html
Sockets are indeed the window to networking and networking drives the whole world some way or other, that's why the name "Mighty Sockets". 1 HOW DO WE CREATE THEM? As always we have a system call to do the job for us :). Int sockfd = socket(AF INET, SOCK STREAM, 0); / socket(2) prototype: socket(int domain, int type, int protocol). 2 NAMING THE SOCKET. Naming or addressing of a socket is very important. This is how data is supposed to reach right process. How sockets are addressed depends upon the domain...
Sysenter Based System Call Mechanism in Linux 2.6
http://articles.manugarg.com/systemcallinlinux2_6.html
Sysenter Based System Call Mechanism in Linux 2.6. 1 What are system calls? System calls provide userland processes a way to request services from the kernel. What kind of services? 2 What happens in a system call? A kernel code snippet is run on request of a user process. This code runs in ring 0 (with current privilege level -CPL- 0), which is the highest level of privilege in x86 architecture. All user processes run in ring 3 (CPL 3). So, to implement system call mechanism, what we need is...That this...
About ELF Auxiliary Vectors
http://articles.manugarg.com/aboutelfauxiliaryvectors.html
About ELF Auxiliary Vectors. Mysterious carriers of information from kernelspace to userspace.". ELF auxiliary vectors are a mechanism to transfer certain kernel level information to the user processes. An example of such an information is the pointer to the system call. Entry point in the memory (AT SYSINFO); this information is dynamic in nature and is only known after kernel has finished up loading. 0 (virtual) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -. Since all entry ty...
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manu's blog: Leh'ed Again
http://www.manugarg.com/2010/10/lehed-again.html
Travel, tech, thoughts. October 8, 2010. Rest of the story and the pics to follow soon. Friday, October 08, 2010. Subscribe to: Post Comments (Atom). An ‘explorer’ who likes traveling to mountains. Strong believer of KISS (Keep It Simple, Stupid) principle and an ardent admirer of Feynman. I know a few things about ‘computers’. I am a Site Reliability Engineer. My views here are mine only and do not in any way represent my employer’s stand.). Pactester - a tool to test proxy auto-config (PAC) files.
manu's blog: October 2010
http://www.manugarg.com/2010_10_01_archive.html
Travel, tech, thoughts. October 20, 2010. Pics from Leh and Pangong. Click on the image for complete gallery and more :). Wednesday, October 20, 2010. October 12, 2010. After spending 2 days acclimatizing in Leh. And the picture of a soldier launching a shell to the other side of the border with "From Raveena Tandon to Nawaj Sharif, with Love" written on it :). Next on the way was Magnetic Hill which we skipped for the later. We were going by Indus river. Confluence of Zanskar and Indus rivers. A pass is...
manu's blog: Continuing disrupted file transfer: magic of dd and netcat
http://www.manugarg.com/2005/11/continuing-disrupted-file-transfer.html
Travel, tech, thoughts. November 16, 2005. Continuing disrupted file transfer: magic of dd and netcat. Knowing that ftp copies file sequentially, I was pretty much confident that there must be some way to continue with that 3.3 GB file. My acquaintance with dd and nc came to rescue. This is how I did it-. At server side (amusprddb06):. Dd if=prdcma fullexp 200511032230.dmp.gz iseek=3265440 bs=1024 /nc -l -p 2005. At the client side (amusqadb02):. This is how I calculated seek required:. Block size can be...
manu's blog: pactester - a tool to test proxy auto-config (PAC) files
http://www.manugarg.com/2007/01/google-code-introducing-pactester.html
Travel, tech, thoughts. January 25, 2007. Pactester - a tool to test proxy auto-config (PAC) files. Hackers and Sysadmins :-). Google has recently released " pactester. A tool to test proxy auto-configuration (PAC). Project home page: http:/ code.google.com/p/pactester. Project download: http:/ http:/ code.google.com/p/pactester/downloads/list. Quick Documentation: http:/ pactester.googlecode.com/svn/trunk/README. Mailing list and discussion group: http:/ groups.google.com/group/pactester. How r u doing?
manu's blog: valley of flowers: part VII
http://www.manugarg.com/2009/01/valley-of-flowers-part-vii.html
Travel, tech, thoughts. January 3, 2009. Valley of flowers: part VII. I think, it's the time to finish the VoF series. In my previous post. We were sleeping in Badrinath, at the end of Day 5 of our journey. Badrinath was a 'Rivendell' for us, a place to relax and rejuvenate. The dawn of Day 6 (Thursday Aug 28, 2008). Pul, a bridge over a mountain cleft, made of a huge single rock. The legend has it that it was made by Bheem when Draupadi. Later we went to the Vyas Gufa, the cave where Ved Vyas. Shop that...
manu's blog: Comfort and Bliss, In the lap of Himalayas
http://www.manugarg.com/2010/07/comfort-and-bliss-in-lap-of-himalayas.html
Travel, tech, thoughts. July 13, 2010. Comfort and Bliss, In the lap of Himalayas. I've got to write about our honeymoon trip in October last year. This place was so amazing that not writing about is outright unfair. But, writing about the honeymoon trip can be very difficult, as you can imagine :) We went to this very beautiful resort, Kalmatia Sangam Himalaya Resort or just Kalmatia. View from our breakfast table. Temple - one of the only 12 jyotirlings. We had hired a car from our hometown Hasanpur.
manu's blog: Tail'ing in Python
http://www.manugarg.com/2007/04/tailing-in-python.html
Travel, tech, thoughts. April 2, 2007. Or, finding last line of a huge file. How do you find the last line of a 2 GB log file from within your program? You don't want to go through the whole file, right? Right What you want to do is, you want to start reading from end until you find a newline character. Here is how I did it in Python:. Def Tail(filepath, read size=1024):. This function returns the last line of a file. Filepath: path to file. IOError if file cannot be processed. Offset = read size. Why to...
manu's blog: Trip to Ireland
http://www.manugarg.com/2010/04/trip-to-ireland.html
Travel, tech, thoughts. April 5, 2010. It's been long, very long, since I last wrote. Not that I didn't have anything to write about. I was just being lazy. In fact there are quite a few things that I should write about - trip to Ireland, honeymoon trip to Himalayas, some other random topics. Well, I'll start with trip to Ireland. That's where I was when I wrote the last post. The trail that I picked up for walking in the greens of Ireland is called the wicklow way. Monday, April 05, 2010. Dịch vụ giao h...
manu's blog: BackTrack 2.0 beta on USB stick
http://www.manugarg.com/2006/11/backtrack-20-beta-on-usb-stick.html
Travel, tech, thoughts. November 6, 2006. BackTrack 2.0 beta on USB stick. I have been playing with backtrack installation on USB since last 3 days. Just thought of sharing my experiences with you. I have a 2 GB USB stick. I wanted to create 2 partitions on it and install backtrack in one of them. Don't ask my why - I just wanted to play with different boot options on a USB stick. Here is what I learned from last 3 days of head breaking:. To install backtrack on USB stick (I've been looking for these ins...
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Manu's Public Articles and Projects
Manu's public articles and projects. Sysenter Based System Call Mechanism in Linux 2.6. Starting with version 2.5, linux kernel introduced a new system call entry mechanism on Pentium II processors. Due to performance issues on Pentium IV processors with existing software interrupt method, an alternative system call entry mechanism was implemented using SYSENTER/SYSEXIT instructions available on Pentium II processors. This article explores this new mechanism. About ELF Auxiliary Vectors. A chrome extensi...
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Maritime Propulsion | marine propulsion technologies
The Propulsion System of the Future. At July 12, 2016 11:16. What will the future look like for MTU’s research and development? What will the marine propulsion system of the future look like? An interview with Dr. Andreas Lingens, Executive Vice President Development at MTU. What will the future look like for MTU’s research and development? What is behind MTU’s green and high-tech program? Will ships still be powered by internal combustion engines in 2020? So what are "smart engines"? Well-engineered pro...
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A culture of accountability and a unique compelling brand are what drive change today. Sunday, October 9, 2011. Small Businesses Blogging Best Practices. How often should I blog? What topics should I discuss? How long should my blog posts be? What else should I have in my blog? How do I get people to see my blog posts? We hope these tips help you with your blogging efforts. Please let us know if you need any assistance with setting or managing your own blog. Contact us at info@sbanetwork.org. Get my news...
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