Programming :: Learn Basic C++ - Implement Something Using System() Or Popen() Without Success

Jul 21, 2010

I've got a (very) simple perl xinetd server that I'd like to port to C++. implement something similar using system() or popen() without success.


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Programming :: System For Create Project And Learn Web Server?

Jun 27, 2010

I am web developer, i am work with php,and want choice best linux for create my project
and learn web server

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Programming :: Where To Download To Learn / Program Java For System?

Oct 5, 2009

I went to the sun website but all I see are upgrades to JDK 6, I dont see where to download the actual JDK.

Anyone know where I can download the JDK for Linux?

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Programming :: Implement A System Call For Displaying The System Statistics

Nov 6, 2010

I have been assigned to implement a system call that report the system statistics over all memory which are

Total Pages in Active LRU list
Total Pages in Inactive LRU List

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Programming :: How To Implement Whole New Writing System

Aug 11, 2010

So basically, there is a really cool writing system I have been working on. It could be viewed (for simplification purposes) like an encryption method for the Latin script.

Facts about the writing system:
It has a little over 300 symbols.
It is syllable-driven.
It is highly compositional (eg. "c", "ca", "cae", "ca " and "ci." all map to different symbols - and NOT by overlaying elements)
Symbols have medium graphical complexity (comparable to Korean Hangul, or Japanese Hiragana)
Has a rather complex set of diacritics (~10, some of which can go on any symbol)
Has no ligatures

How transliteration occurs:
Sequences of Latin symbols map to certain symbols. Example below:[G][rou][p ][hu][g.]Characters sequences between "[" and "]" map to a single symbol (so it would take only 5 symbols to write "Group hug.").

How I want it to work:
I would like to have a daemon that: Intercepts all text displayed on the screen.
Converts it to my writing system (changes letter sequences with individual Unicode codes)
Leaves unsupported symbols unchanged.
Displays all the text on the screen using my font and characters intertwined with the fonts and characters left unchanged.

For example, if you take the following line of C++ code:for (i = 1; i <= n; i++)
I would like it displayed like this:[fo][r ]([i ]= [1]; [i ]<= [n]; [i]++)
Bold-symbols should be in my Unicode font with special symbols defined for this writing system, and the rest should be in its original font and encoding. Also, I would like this encoding to hold for display-purposes only. The data in the memory should remain unaffected. This also means real-time adjustments: if I open a text editor (say, from the OpenOffice Suite) and I start typing, I would like to see what I type encoded with my writing system, even though the document actually contains Latin letters. This also means that the symbol immediately before the cursor may change as you type.

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Programming :: How To Extract Output Ulimit Under Popen

Jan 30, 2011

A strange question, I guess. I'm running processes called from a c main program. The calling is performed (for now) as: FILE * res=popen(ulimit -t 1; prg args); So I can read the stdout of the process as a file and analyze it. The time limit is important for me.

2 questions:
1. How do I get to know if the process terminated on its own or by the ulimit?
2. How do I limit to times that are less than 1 sec (I have many of those).

I know that setrlimit exists, just before I change my whole approach I wanted to see if I can deal with these things from the outside.

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Programming :: Is Popen Thread Safe Via Pthreads?

Sep 17, 2010

I don't seem to find a conclusive answer to this one...."Is popen thread safe via pthreads?"

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Programming :: Segmentation Fault With Popen And Fgetws?

Dec 12, 2010

Is it ok to read a process output with fgetws? I get segmentation fault when I try that.

#include <iostream>
#include <cstdio>
int main()
wchar_t line[4096];


I can read the output from the process if I use fgets instead of fgetws.But I am getting special characters in the output for some commands, that is why I wanted to try with fgetws.

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Programming :: Your Opinions Of The Best Combination Of Programming Languages To Learn

Jun 10, 2010

I want to know your opinions on the best combination of programming languages to learn if you want to learn more than one. An explanation of your choices would be real nice. I've included a multiple-choice poll that has the langauges from the Member's Choice Awards 2009 list of best programming languages on it. Please vote for your choice of languages also. It should be interesting to see what the numbers are like when people can vote this way, and choose more than one language.I'm voting for Python/C just as an "overall" opinion. It's what I'm going to learn. I've done quite a bit of reading and experimenting and this is what I've personally settled on. My opinion is just a personal "overall" opinion. You can also pick just a single language, and vote for just a single language if you think it's better to learn just one.

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Programming :: How To Learn ASM

Mar 4, 2010

I wanted to try learning Assembler, I wonder if you know of any good tutorials or hints? I have an x86_64 CPU running (obviously) Linux.

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Programming :: Book To Learn Programming In C ANSI?

Jul 11, 2011

What book you recommend to learn programming in C ANSI ?

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Fedora :: Learn About System And Usages?

Jan 26, 2010

Anyone know a manual to tell me the many things about Fedora? Like what is usr or a bin or a lib... Stuff like that I have a month to kill and I want to become an expert on this OS.

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General :: Best Place To Start To Learn System?

Jan 24, 2011

I am starting to dive into Linux after being a Microsoft geek for years. Where is the best place to start?

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Server :: Learn System Commands / Want To Do A Certification

Sep 21, 2010

I want to learn Linux commands and want to do a certification.

PLEASE HELP with the key points and if you have anything important about it.

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Programming :: Use Socket Programming In Order To Implement Chatting Feature?

Aug 25, 2010

how to use socket programming in order to implement chatting feature

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Ubuntu :: Programming Languages For Projects \ Which Ones The Best To Learn

Mar 25, 2010

have a previous background in internet programming languages such as XHTML, DHTML, CSS and javacsript. I would like to start programming and managing my linux system (like an expert) and starting on linux projects also. My question is which is the best programming language to learn: C, C++ (may b even C+), python, Perl etc... I'm learning BASH right now cause I know its a necessity for linux systems. but what would you guys suggest after that I learn.

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Ubuntu :: SPE - Learn Programming In Python, But Can't Type Anything?

May 15, 2011

ubuntu terminal mingling made me want to learn programming, i started with python, using idle workspace (is this the right term?)i got to the stage when i need and want to use SPE workspace.i have downloaded it, but can't type in it - when i type, nothing happens at all.where have i been wrong please ?

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General :: Which Programming Languages Do Need To Learn For Career?

May 4, 2011

I am just starting to learn Linux and am interested in a career in Linux. Actually I wanna go for RHCE, which is the first step for Sys Admin..right?? Basically I do NOT want to go into programming/developing as I don't feel it's my cup of tea (and also may be it sort of boggles me). Still, from what I gather I am having confusions regarding whether I should learn any programming language for a career in Linux.

Here I am avoiding programming..and now I get to hear that Linux career uses programming..That's sort of frustrating...My friend told me I need to "master" C. Do I need to learn some programming language?? If yes, then to how much extent?

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Programming :: Perl Vs Python Which Is Easier To Learn

Jan 21, 2011

i want to learn a scripting language,which one should i go for ,among perl and python.

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Programming :: Good Book To Learn About Threads In C / C++?

Oct 30, 2010

A good book to learn about threads in C/C++?

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Programming :: Which Scripting Language To Learn For Administration?

May 26, 2011

Which scripting language to learn for Linux Administration? Python, Ruby, Perl, or PHP?

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Programming :: Languages To Learn For Dynamic Website Design?

Nov 23, 2010

So a friend and I are new-ish to linux (I am reasonably comfortable with basic /etc text editing, command admin). We are, however, completely new to programming and (x)html. We have a few (what we think are) interesting ideas for dynamic websites.Ideally we would like to develop our own course of study to get to the point where we have a basic understanding of programming so that our adventures in the programming of a dynamic website would be possible. Much of what we need learn to do is the following: use daily updated public-domain data from several other sites, manipulate that data algorithmically, which would then yield updating output on our site. Here is what I would like to do:

1. learn the basics of programming with a language that would teach good code habits and fundamental understanding.
2. become comfortable with (x)html
3. learn another language for the extension of (x)html into a dynamic data-heavy website.

Question could you please suggest a way about going about 1>2>3?Ideally the language of (1) would be something that would not be "wasted" just on web design etc. As a language, C really appeals to me. However, if learning this wouldn't lend itself to being helpful in learning another language for webdesign maybe I shouldn't use it(?).If (1) weren't to be C, what language would be funadmental enough to teach good coding but also be helpful in learning (3)

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Networking :: Good Tutorial In Order To Learn IPSec Vpn With System?

Dec 17, 2010

I've no experience with IPSec. I've used many times OpenVPN (with static key or certificates x509).
Could anyone suggest me a good tutorial in order to learn IPSec vpn with Linux?

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Software :: Webiste To Download A Free Version Of System To Learn?

Mar 11, 2010

I wish to download a free version of Linux x86 (Debian, Mandriva, Red Hat or Ubuntu) so that I can install it and learn linux. The reason why I have mention the above versions is that I need to Install Oracle 10G on it to learn Oracle on Linux x86.

Can someone please post me the webiste url/s that I can download a free version of linux to learn?

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Programming :: Implement The OOP In Interpreter?

Mar 7, 2011

I have a partially completed interpreter that has first-calss functions and can store scopes in variables. That way it is possible to implement a simple class like this:


MyClass = func () {
value = 0;
setValue = func (x) value = x;;


But what about inheritance, and what if I want to know the type of the object?

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Programming :: Implement Two Periodical Processes In C++?

Jul 28, 2010

I am doing real time programming in C++, under Linux. I have two processes, let me say A and B. A process is being started periodically, every 5ms. B process is being started every 10ms. The process A is doing data processing. The process B is reading that data and displays it. I am confused about how to run periodically processes. The problem is that the period of process A should be as much as it is possible accurate (5ms). For the process B it isn't so important. I have created independent processes, each in one .cpp file, and I am starting them from bash file. Is that OK? I don't have to make child processes in order to have parallel processes?

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Programming :: How To Implement Count Word

Nov 9, 2010

I have these but not working.

size_t count_words(const std::string& s)
std::istringstream is(s);
return distance( std::istream_iterator<std::string>(is),
std::string s; // word count
unsigned int wordno = 0;
while(getline(myfile, s))
{ ++wordno;
if(s.empty())++ wordno;
else wordno += count_words(s);
std::cout << s << '

myoutput1<< "Number of words : " << wordno << '
myoutput1 << "
Word" <<" " <<" Occurrence" <<endl;
myoutput2<< "Number of words : " << wordno << '
myoutput2 << "
Word" <<" " <<" Occurrence" <<endl;

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Programming :: Implement Own Protocol With AgenjJ?

Feb 9, 2011

I developed a protocol "it's a modification of OLSR" for wireless networks, it was with JAVA and I try to simulate it on NS2, I used AgentJ, so in the TCL I did any thing like usual;

set val(chan) Channel/WirelessChannel ;# channel type
set val(prop)Propagation/TwoRayGround ;# radio-propagation model
set val(netif) Phy/WirelessPhy ;# network interface type


and I didn't specified the protocol because I attached my nodes to the JAVA class responsible for the protocol, but when I run it generates errors, it claims the protocol to use, so I don't know how proceeding.

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Programming :: Implement Persistent SSL Connection ?

May 14, 2011

I implemented a SSL client using openssl on Linux and it's working fine i am getting response from server...

But my problem is I have a separate thread for each request comes form front end and i have to do SSL communication in each thread, for this i have to create a separate SSL Context for each thread and this is taking too much time hence my transaction is getting delayed

My question is can we implement Persistent SSL connection where i will do SSL Handshake only at the time of application startup and use that connection in all the threads....

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Programming :: Implement A Set Class (like In Stl) Using A Vector?

Sep 3, 2010

i need to implement a Set class(like in stl) using a vector.Here is my code that doesnt work corectly:

#include <iostream>
#include <vector>
template<class T>
class Set


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