LINUX programming Forum RSS Feed (Replies Included)

NS-2 simulator question!!

Sat, 16 Feb 2013 15:06:49 -0700

hi all,
I just want to ask if any1 can help me in my project.
I'm trying to build a framework for cognitive radio using NS-2 simulator under linux fedora, so if any1 can help me please notify me, and I'll appreciate that.

thanks all,
Doulat

linux help

Sun, 10 Feb 2013 09:25:42 -0700

Hey, I'm kinda new here and I'm here to ask you for a favor. So I've got a homework on linux programming and I'll need to explain this whole script to my lecturer in tomorrow. Can any of you please explain what does each segment of this script does? Thanks in advance.

#!/bin/bash

echo '1. New entry (Name, Surname, phone number, e-mail):'
echo '2. Entry search'
echo '3. List all entries'
echo '4. Delete an entry'
echo '5. Edit an entry'
echo '6. Quit'

choice=0
while [ $choice -ne 6 ]
do

read choice

case $choice in

1)
echo 'Ener Name, surname, phone number and e-mail, separated by spaces:'
read id
echo $id >> info.txt
;;

2)
echo 'Enter id data to search for:'
read search
grep -n $search info.txt
;;

3)
echo 'Full entry-list:'
cat -n info.txt
;;

4)
echo 'Specify an entry # for removal:'
cat -n info.txt
read del
sed $del'd' info.txt>temp
mv temp info.txt
cat -n info.txt
;;

5)
echo 'Specify an entry # for editing:'
cat -n info.txt
read edit
echo 'Enter new data:'
read id
sed -i "${edit} s/.*/${id}/" info.txt
;;

6)
echo 'bye'
;;

*)
echo 'Wrong selection'
;;
esac
done

linux help

Sun, 10 Feb 2013 09:22:51 -0700

Re: using open(), etc. to move data on a disk with mounted partitions

Sun, 27 Jan 2013 13:21:37 -0700

Sorry about the multi-post, the forum was giving me errors on posting and I thought the posts failed.

using system calls to move data on a disk with mounted partitions

Sun, 27 Jan 2013 13:08:53 -0700

I need to be able to move data around a disk that has mounted
partitions on Linux. I am not touching data inside the mounted
partitions or the MBR, only the free space around it or unmounted
partitions. So, for example, I would need access to "/dev/sdb" while
"/dev/sdb1" is mounted.

Currently I am using libparted functions but the move is giving me
corruption when the disk is busy. Would the system call open(pathname,
flags) work here? If I use open() are there any major gotchas I should
be aware of? Also, what flags would be a good idea? I'll need
O_LARGEFILE and O_NOATIME but I am wondering about O_DIRECT for
example.

Thank you.

using open(), etc. to move data on a disk with mounted partitions

Sun, 27 Jan 2013 13:03:12 -0700

using open(), etc. to move data on a disk with mounted partitions

Sun, 27 Jan 2013 12:57:10 -0700

Integration of PyQt/PySide issue

Wed, 23 Jan 2013 01:23:47 -0700

There is an application (Salome) that includes interpretor Python and Qt and PyQt libs.
Also there is a module for this application written on Python.
Specially for this module we need to include additional version of PyQt or PySide that will be distributed with our module.
It doesn’t really matter whether it will be PyQt (commercial, modified with the help of Vendor ID utility) or PySide.

The problem is when i try to load any of those libs in Salome, i get the next import error message.
PyQt: undefined symbol: _ZN10QTableView13doItemsLayoutEv
PySide: undefined symbol: _ZN9QMetaType15registerTypedefEPKci

When importing those modules the same way in test script and running it through interpretor installed in the system everything is working fine.

Also we tried to recompile the Python 2.6.6 and rebuild PyQt/PySide, but got the same errors.

Please advise what can cause such problem and how can it be solved.

P.S: in case with integration of PySide there is another problem: PySide is referring to a lib that has to be located in the system folder
/usr/lib/i386-linux-gnu/libpyside-python2.7.so, while in our case all paths should be relative.

Any help or advice will be appreciated!

integration of PyQt/PySide issue

Wed, 23 Jan 2013 01:14:50 -0700

Re: Programming for Linux

Tue, 30 Oct 2012 13:54:01 -0700

No, because everybody has a Windows Machine and I am sure that a program written for Windows will work everywhere. For Linux is not the same. I know.
www.denisgottardello.it
Skype: mrdebug
Videosurveillance and home automation!
http://www.denisgottardello.it/DomusBoss/DomusBossIndice.php

Re: Programming for Linux

Tue, 30 Oct 2012 13:48:35 -0700

[deleted]

Tue, 25 Sep 2012 12:29:55 -0700

[duplicate]

Best Video Conferencing solution for Us?

Tue, 25 Sep 2012 12:26:50 -0700

We are trying to integrate a simple Video Conferencing (open source) solution into our existing application which is written in C++ and it runs on Linux.

I am currently looking at using Ekiga (formely known as GnomeMeeting) or Homer Conferencing (short: Homer).

My plan is to "integrate" an existing Video Conferencing client into our existing software.

Please give me recommendation on which 3rd party application or library to use to add video conferencing feature to our application.

Programming for Linux

Wed, 12 Sep 2012 16:33:14 -0700

Why do you feel people only program for Windows or Macintosh? Is it because they don't want to release their source code, lack of knowledge of alternative operating systems?

Re: attribute in C programing

Wed, 27 Jun 2012 02:17:51 -0700

Hi,

I have just noticed that all my files have the attribute C. I've been running XP on the machine for several years, and I never noticed that before.

Re: attribute in C programing

Wed, 27 Jun 2012 02:15:59 -0700

Hi,

I have just noticed that all my files have the attribute C. I've been running XP on the machine for several years, and I never noticed that before.

Website Design Company | Graphics Design Services

Semaphore aquiring issue in a Process,which is spawned by other proc

Thu, 08 Mar 2012 20:52:52 -0700

Hi,

I am building a system where a script will start one process (suppose the process name is procA). This procA will in turn spawn another process (procB) through execv(). The environment is Linux and the coding language used is C/C++.

If the script content is "./procA &" means if procA is started in background, procB (which is spawned by procA) does not starts properly. That happens because procB while starting tries to get a semaphore, which it could not get and hangs there. This is the first place where it tries to get that semaphore so no possibility of the semaphore to be locked by someone else.

Even strange is, when the script content is "./procA" means procA is started in foreground, this problem does not arise and procB starts properly. Its also able to get that semaphore.

Can some one please help??

Thanks,
viv2012

Semaphore aquiring issue in a Process,which is spawned by other proc

Thu, 08 Mar 2012 20:51:01 -0700

linux newbie

Thu, 09 Feb 2012 01:15:29 -0700

I'm working in a automation company since 5 yrs..I've experience in micro controller embedded c programming..now I want to learn Linux and RTOS programming...from where I can start..is there any good book for it.

Thanks,

bind fails on socket

Thu, 26 Jan 2012 01:47:24 -0700

Hi! Here's my problem: I create, bind, set to listen a TCP socket (non-blocking mode). Then client connects, I accept connection, data is transferred properly. Now if client first disconnects and only then I close my application (closing data socket, then listening one) I can start this application again (i.e listen on the same port again) without any problems. However if close my application before client disconnects (still closing both data and listening sockets) I can not listen on the same port again for about 30-40 seconds (bind fails, system says port in use). After 30-40 seconds I can listen again. I use shutdown and close to close sockets and always first close data socket and only then listening one. Does anyone know why system thinks that port is still in use if close server application before client disconnects? Client, by the way, detects disconnect and quits too.

kbhit with up arrow

Wed, 11 Jan 2012 13:11:19 -0700

Since _kbhit is with windows, I have a routine done
on linux, however, I am not able to get the up arrow
key ( the one with the command history ) to work properly
within the console. Please help.

Is there any routine that can retrieve the history when
the up arrow key is recognized?

Re: attribute in C programing

Mon, 05 Dec 2011 01:04:40 -0700

The article is since 2001 but I will answer anyway.

Take for example this code:

struct Packaging {
    char c;
    int i;
} Packaging;

sizeof(Packaging) will be 8 Bytes.

or you could do:

#pragma pack(push)
#pragma pack(1)

struct Packaging {
    char c;
    int i;
} Packaging;

#pragma pack(pop)

sizeof(Packaging) will be 5 Bytes because of aliasing.

We can use __attribute__ instead of #pragma, like this:

struct Packaging {
    char c;
    int i;
} __attribute__((packed)) Packaging;

It will have the same effect as pragma.
And there are a lot of other uses for __attribute__.

I have 2 important problems to solve guys!

Mon, 24 Oct 2011 13:40:47 -0700

Hello,

I study Computer Engineering in Poland. I have 2 important problems to solve on Linux Terminal...

1. Write a script which takes input from a user and display on the monitor. It's square.
e.g. 5^2 = 25
Tip: Use "read" command.

2. Write a script which verifies your current date and time and if it coincides with your lab classes it should print "I wish you good work!" and if not your lab time must write "Do you rest, go to work!"

I am looking forward to hear good news from you! :) I really have to solve these problems!

Thanks a lot,

Best Regards...

script on linux terminal

Mon, 24 Oct 2011 13:40:36 -0700

I want to write a script which calculates square of a number by using read command on Linux. How can i write??? please can anyone help me???

app that hashes host's mac address and c.name and submits to server

Thu, 06 Oct 2011 02:50:45 -0700

Hi to all. I want to create a desktop or web app / service that hashes the host's mac address with the computer's name along with other computer attributes (cpu,hdisks,os etc..) and creates an id. Then it sends this id to the server to get stored into a binary file. Now every time the client requests from server , the server gets this generated id from client and authenticates, so it knows it is the same computer. I need to make this in order to create a secure server-client access lock. OS = linux.

I have not done anything similar so any help would be highly appreciated.
Are there any ready apps-algorithms that would do sth like that?

LINUX programming Forum RSS Feed (Replies Included)

NS-2 simulator question!!

linux help

linux help

Re: using open(), etc. to move data on a disk with mounted partitions

using system calls to move data on a disk with mounted partitions

using open(), etc. to move data on a disk with mounted partitions

using open(), etc. to move data on a disk with mounted partitions

Integration of PyQt/PySide issue

integration of PyQt/PySide issue

Re: Programming for Linux

Re: Programming for Linux

[deleted]

Best Video Conferencing solution for Us?

Programming for Linux

Re: __attribute__ in C programing

Re: __attribute__ in C programing

Semaphore aquiring issue in a Process,which is spawned by other proc

Semaphore aquiring issue in a Process,which is spawned by other proc

linux newbie

bind fails on socket

kbhit with up arrow

Re: __attribute__ in C programing

I have 2 important problems to solve guys!

script on linux terminal

app that hashes host's mac address and c.name and submits to server

Re: attribute in C programing

Re: attribute in C programing

Re: attribute in C programing