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I have just started programming and would like to implement a file monitoring system from scratch in C.
I have used the Watch Service API in java but I would like to learn how to build one from scratch. I would really appreciate some assistance and guidance.
Thanks.
You can:
either rely on existing system calls that will push you notifications on file system modifications (eg: inotify)
implement your own kernel module that will intercept file system modification and notify you (if you really want to reimplement the wheel)
use a polling-approach, rebuild the filesystem tree in-memory and compare it every second or so. This will be very cpu/io/memory consuming, but it can be instructive.
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I'm really confused when I'm writing a driver? just need to know which file should I write first header file, or the configuration file otherwise the code file. just for example keypad driver using C. if there any resources to understand more these steps for writing driver I will be very thankful
Be it a driver development or application development,
Very first step is be clear with requirement,
Then have a proper design and then go for coding.
Note that coding without design is a disaster.
Which file to start with is your question?
If you are so much confused just start with code file.
Keep entire code in that file.
Later on you can re arrange your code to different files like header file , Config file , code file etc...
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i have created a server client application using TCP in C in linux environment,and it is working very well.
I wish to improve the application by including a cryptographic algorithm into it so that the server just gets to know about who has logged in and out of the server but not about the information shared between the clients.
Any suggestions for algorithm that i should employ in my project to achieve the desired result.
I am currently looking into MD5 algorithm.
As far as I understand you want to encrypt/decrypt messages between users. If so MD5 won't do it as it is just a hash function.
https://en.wikipedia.org/wiki/MD5
Probably the best algorithm to do so would be AES:
https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
There are many implementation (including in C) on the web so you can literally copy-paste the code (mind the license ;) ).
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If I want to create a game in C with SDL for example, is there a reason of why I should use a scripting language like Lua with it (since alot of commercial games uses a scripting language)? I have heard that scripting languages often are faster to write and easier to read, but what should they do? (graphics? ai? input? etc).
They should interact with the various "programming primitives" that the native code implements. That is, the native code should only do enough to allow the scripts to function within the game (although "function" can sometimes mean speed-wise).
If that sounds cyclical... it is. There's no complete way to define at the beginning of development what responsibilities the native code will have as the project progresses.
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I would like to write virtual machine. Ideally I want to write program, which will be run(emulate) windows 7(from .iso) and show it in window on Windows 7 parent. But I can't understand how to do it. I understand how to emulate cpu, for example, just write wrapper(interface) which will be provide real cpu resources(http://www.codeproject.com/Articles/43176/How-to-create-your-own-virtual-machine), but what next? how to run OS, which will be use this abstraction interface of cpu. Bios starts OS, should I emulate bios? how to do it? From what should I start? Please, describe me the basic steps to implement my task.
Thank you very much!
I'm sure years and years of work go into these type of programs. However, to get a taste of emulating CPU and coding it yourself, have a look at nand2tetris.
It starts by looking at the logic and arithmetic first, slowly working your way towards program control, high-level language and making a operating system.
Hope this helps!
(BTW it provides all materials and software for free!)
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I need to develop a web server using c in Linux. Using that we need to start and configure services. is their any help like pseudo code or sample programs like that.
http://www.gnu.org/software/libc/manual/html_node/Server-Example.html
This is a simple multi-user web server built in C. I had to do one of these last year for a class, and I find it quite cool, though a little bit frustrating.
The Apache HTTP server, the world's most popular HTTP server, is written in C. Its documentation, and source downloads are located here