Programming :: Ptrace System Command Not Working Properly In X86 Platform
Apr 20, 2011
basically in the child process iam just calling the ptrace(PTRACE_TRACEME, 0, NULL, NULL) system call but if add this stsyem call rest of the code not working properly. i found the reason basically what happening is when we have ptrace() system call its printing the same variable 3 times i.e its not executing it 3 times but just it is printing 3 times .iam just wondering how it could be possible.
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Mar 22, 2011
I created a user named Bob. Now i want to change its home directory to be Bob1. I did this
usermod -d /home/Bob1 Bob
but not effect !!!
The name was still Bob. What might be issue ?
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May 27, 2011
My Question is I have installed the ssh key authentication in Server A. User can connect this using key file via SSH. without authentication user can't connect this system via SSH. Now I am trying to copy the file from Server B through SCP command. But it is not working. While I am trying use this command from Server B I am getting below error "ssh: connect to host xxx.xxx.xxx.xxx port 22: Connection timed out lost connection". xxx.xxx.xxx.xxx is Server A. SSH is enabled in both server A,B.
why SCP command is not working?
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Mar 2, 2011
I have installed Ubuntu 10.10 to a live USB stick and created a new user with an encrypted home directory.Everything is working fine apart from a weird problem.when I create a new file or directory in the encrypted home it does not show up in directory listing.eg:cd ~/Documentstouch test.txtls -aldrwxr-xr-x 2 USER USER 4096 2011-03-02 14:12 .drwx------ 32 USER USER 8192 2011-03-02 13:03 ..if I try editing the file by entering the path, it works, even though ls does not list it!eg: nano ./testls as root makes no difference and the file is not hidden.If I create a file in nautilus, it shows there but still does not show in the terminal or any other app
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Feb 19, 2011
I have a webpage in html that uses <frameset> tag. One of the frames is a Table of Contents (toc.htm) that lists a series of images. The other frame is called 'canvas.htm'. My framset is laid out as follows:
<frameset rows="20%, 80%">
<frame src="./banner_sp.htm" ></frame>
<frameset cols="15, 85">
<frame name="toc" src="./toc.htm" ></frame>
[Code]....
The frameset is created properly and I can load the images manually (i.e. I can access the images from my browser and/or image editing tool). The problem comes when I attempt to access the images from the toc.htm frame. Instead of opening the image in the canvas.htm frame, a new window is displayed in my browser, instead of the image being displayed in the target window (canvas.htm). This happens on all of my browsers (firefox, safari, IE7/8 and Opera) on Windows, debian-linux and OS X 10.5/10.6.
If I change my src attribute (in the canvas frame) to toc.htm, I see the Table of Contents (toc.htm) displayed side-by-side until I click on the first drawing in the list. At this point, the frame 'behaves' half-arsed the way I want it to. I have searched on google till I am blue(er) in the face with no luck.
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May 13, 2010
I am creating a simple program using C# to print the contents of the todo.txt file once it has run. Problem is when I run the program, I get this warning.
PHP Code:
[code]....
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Apr 14, 2011
I am busy writing this script to get a pixel count of a large batch of images in a directory for a research project. To do this I'm using a loop to get all the images in the directory. To make the whole procedure more user friendly for some colleagues I decided to use zenity, something I haven't yet really worked with. As not to make sure that the users don't have to watch to this blank screen during the actual processing of the images I'm trying to get the zenity progress bar working. So far the progress bar comes up but instead of changing over time it stays "empty" till all the images are processed and then becomes 100% when all images are done. What servers my needs for now, but since I am trying to learn more about zenity I was wondering how I could change the script to get the progress bar properly working? Below is the piece of script I am talking about.
Code:
cd $input #goto path of image directory
(for a in *jpg *JPG *jpeg *JPEG; do
if [ -f "$a" ]; then #was it a image file
b="$a" #set b to $a
convert -resize 1000x1000! ${b} -depth 1 -format %c histogram:info:$b.txt #get pixelcount and write to .txt file
fi
done) | zenity --progress
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Aug 10, 2010
I have a problem with sshd daemon on a target linux system:The system has only one user (root) without password.The sshd_config looks like:
Code:
Port 22
Protocol 2
[code]...
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Apr 13, 2010
I am using Fedora 12. I have the following problem, when i working with system-config-samba dialog:I add the new user on the server:as following:
Unix username: vova
Windows username:test
As described in Customisation Guide for Red Hat 9: "If the user has a different username on a Windows machine and will be logging into the Samba serverfrom the Windows machine, specify that Windows username in the Windows Username field."So i logged from the Windows machine not under test(Windows username) but under vova.And i logged in without the problem. However it seems that samba should check windows username=test (as have written in samba-config) and ask an password for different users. And additionally, if samba check the currect user in Windows itself and verify it with Unix user, what for we need write the Windows username in samba config? I don't understand
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Mar 29, 2010
I installed Mythbuntu 9.04 about 9 months to a year ago and (for the most part) I haven't had any problems with mythwelcome, automatic shutdown or the system clock. The "for the most part" relates to the fact that the clock on mythbuntu has always been 4 minutes fast. Then, just last week, the system started acting up - for some reason the system clock changed to 8-10 minutes fast (6 minutes faster than it was previously). To fix this problem, I have tried manually setting the "time and date" setting, and I have also tried setting the "time and date" setting to sync with an internet server. Lastly, I tried changing the system time through the motherboard bios. In each situation, mythwelcome would initially start up with the correct time. Then, several seconds later, the time shown in mythwelcome would change to being 4 minutes fast (as I described above). The time would also be 4 minutes fast when I enter the frontend.
I was willing to live with this, but the weird part is that when I start the system now (assuming I don't have any programs scheduled to record), mythwelcome boots up fine and I see the indication that "MythTV is idel and will shutdown in XXX seconds". Then, it flashes to "MythTV is idle" - like it used to; except now, it doesn't flash back to the countdown for shutting down mythtv. One time when I started the system when I was adjusting the time as mentioned above, I noticed that mythwelcome went to the "MythTV is idle" around the same time it changed the clock to 4 minutes fast - I think there is definitely a correlation here.
I checked out all the settings and nothing else has been changed that would otherwise affect MythTV from shutting itself down. The other interesting part is that I can get the shutdown countdown back if I go to "Utilities / Setup", "Setup", and "Mythbuntu". In the popup screen I choose "MythTV Configuration" and select "Launch MythTV Setup". I get a popup box that says that the mythbackend must be closed (as expected). Then I immediately exit mythtv-setup and the system runs "mythfilldatabase". I exit the Mythbuntu Control Centre and exit the frontend. When I get back to mythwelcome, the shutdown countdown comes back.
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Apr 13, 2010
I am writing a perl script which uses the matlab compiler to compile a .m file.
I am using the system("mcc �m file.m"). I have matlab installed and both script and exe are in the same drive.But i get the following error .
'mcc' is not a recognised as an internal or external command ,operable in program or batch file.
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Mar 7, 2010
Groovy is an object-oriented programming language for the Java platform. I do not have experience in Java, only perl and shell scripts. Recently I have been asked to maintain a software written in groovy (also to make enhancements). So can I learn groovy without knowing java language. or isit I have to learn java before venturing into groovy.
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Oct 30, 2009
I have some files which are UTF8 and have first line as blank. It shows as data file by "file" command. If I remove the blank line, it shows it as UTF8 text file. I have to choose displayable text files from many files, so I used "file" command.
Note: I do not have permission to attach file. So not able to attach sample file here.
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Mar 21, 2011
I am trying to ptrace a vsftpd server process on linux to be able to get control whenever vsftpd process makes a system call. I start the vsftpd process and pass this process id as command line to the following program which traces vsftpd. however, when I run the following program it just hangs and does not print anything.
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
[code]....
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Dec 27, 2009
I've recently installed from scratch Suse 11.2, and I'm having a bit of an issue with kdesu. Basically everytime I try to start an application using kdesu (e.g. Yast), the windows where to put the password appears, but when I click on OK, or I press enter nothing happens, the windows stays where it was, and of course the program does not start. The same issue occurs when I type the password to open kwalletmanager, I suppose the two things are connected.
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May 12, 2011
I've just started using gdb at my new job, and I'm having a small issue debugging C++ with it. After I execute "continue" or "run" through gdb, I'm not able to return control to gdb. Based on the documentation I read, I should be able to use Control-C to interrupt the program, and have control return to gdb.
This does not work on my setup. Not sure if it's related, but I'm debugging on a remote machine. I tried through PuTTY and xterm using Exceed XServer. In both cases, gdb does not respond to Control-C. This is quite annoying because I have to restart my program every time I want to set a breakpoint.
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Apr 22, 2011
I have prepared a script which will login to each server and search for a keyword.
I want output on same machine from where m running script.
When i try to run command on any machine.. It works well.
w=$(grep -irH "keyword.com" /home/*/public_html/*);if [ $? -eq 0 ];then echo -e "
$HOSTNAME";echo $(grep -irH "keyword.com" /home/*/public_html/* | cut -d: -f1 | uniq | awk '{for (i=1;i<=NF;i++) printf "%s
",$i}');fi
[Code]....
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Feb 16, 2010
I can't get exec ping to work on my system. wish is located in /usr/bin/wish8.4
Code:
#!/usr/bin/wish8.4
text .txt
set in [open "/root/hosts.txt" r]
while {[gets $in line] != -1} {
[Code]....
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Jul 8, 2009
Yum command is not working on my system today!
when i write any commands using yum, such as yum check-update or
yum install some package it shows the following code...
shall add something to my repository?
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Jul 28, 2011
I am making a text search engine. I need to first convert binary documents to text. I want to go with cross-platform (we develop both on windows and linux) command line (so that I can get the output via python subprocess). What are the choices for this?
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Jun 8, 2014
What are the availability`s for cross platform sql , gui, application development using raw code in the Debian environment. I would rather work with raw code. I have been working with PHP MySQL, need to advance to Universe Application Development cross platform Raw Code for both mobile and desk top.
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May 14, 2010
I have an odd thing. And thats the following:
I entered: gcc raw.c -m32 -g -static -o raw
And I got:
I installed all bin32 libs I am on a x64 system.
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Aug 28, 2010
I am in my final year B.tech....I want to make a project which have involvement of linux platform...i have basic knowledge of c,c++,java and PHP...i have a LAN in my college...so LAN networking is also possible...Any ideas are most welcome even silly ideas too because i am lacking of ideas right now...also suggest basic type of projects not very hi-fi..
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Apr 13, 2010
hi i want to lock my usb port of system.i am using linux fedora 11 operating system. so for that purpose i want to know or i want the detection code that detect any external devices plug in to system.
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Apr 5, 2010
I am trying to run a script to setup environment variables and then run other commands in a make file. But the source or the dot operator (shell is bash) does not seem to take any effect as the subsequent command didn't pick the environment up. Do I have to put every lines of the environment setup in the first script into the makefile instead?
sample setenv.sh
#!/bin/sh
export MYDIR=/somedir
sample makefile:
all: source ./setenv.sh
echo $(MYDIR)
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Feb 19, 2014
I was writing code to execute system command, using GDM3 an logged in as root (just commented line #auth required
pam_succeed_if.so user != root quiet_success , in /etc/pam.d/gdm3).
When i execute:
Code: Select allvoid criarWindowsDialog::on_pushButton_2_clicked() {
ui->commandTextEdit->append("Processo iniciado ...");
QProcess processo;
QString comando;
QStringList args;
QString fullCommand;
QString stdOut;
QString stdError;
[CODE]..
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May 20, 2010
I'm trying to call a system command in perl and am having an issue with it.
Here's an example of a command i'd like to call: Code: sed -i '4 c192.168.1.4 www.something.com' hosts this is the section in my perl script where I create the variable and call it: Code: $doit = `sed -i '$line c$ip $host hosts'`system($doit); The $line, $ip, and $host variables are working fine becasue I can replace that section with "prints" and they come out fine. I imagine the problem is where I am creating the $doit variable.
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May 15, 2010
I have found this from a site [url]
Code:
But it does not work for me, segfault.
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Dec 17, 2009
I am calling another executable in my application (C programing) using "system" command
which is user interactive program. now i want to pass those args in system command only.
system(" executable ");
Executable will expect 1,2 or 3.
1 is to continue
2 for do changes in settings
3 exit from application
how to pass these in to system command
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Oct 30, 2014
I'm looking for a way to create a cross-platform GUI application. The result must be able to run on linux, windows and OSX. And it must be a point-and-click GUI.For development I should be able to rely on Open-Source tools on linux only (that means no access to Windows or OSX)The target should be able to install the result relatively easily, that means any dependencies must be freely available, and the setup steps must be very minimal (probably means no installing development tools or running compilers)
My first thought was java, but the standard Swing GUI can look a bit ugly on some platforms. So I'm wondering if there's anything else. My next thought was C++/Qt, but I don't think I can cross-compile this from Debian for Windows or OSX, can I? Next I thought of python and PyQt, but it looks like PyQt isn't available for OSX. And finally I even thought of making some kind of web application running on a tiny web server of some kind, then accessing it with a native browser, but I'm pretty sure this doesn't meet the "easy to install" criteria. I'm finding this so tricky, do all the existing cross-platform applications use natively-compiled C++ for this? Or is there an obvious alternative that I'm overlooking?
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