Programming :: Programmers And People That Understand The OS?
Apr 24, 2011
Well I get my other 2 questions answered , I have one last question that has been buggy me.Anyone know why windows use so many files just to keep the OS going and so bloated? The under line of files of windows is messy and loads self every where and very bloated with windows and windows vista and windows 7 very much so.I'm not sure if Linux /Mac OS X is like this or not .
I know windows needs to support alot more software and hardwar but is that not where drivers come in for the hardware.And programmers need to write the software for windows or Linux / Mac OS X.
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Mar 22, 2010
Why are all of the Pygame games so slow? Even a simple platform-hopping game moves like a snail. Other enourmously more complicated games, not Python in origin, don't seem to have such a problem on the same hardware. Is it that the programmers are (just like me), too inexperienced? Or can I just not expect to get good performance from Pygame?
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Mar 10, 2010
I write a little script by bash.
#!/bin/bash
a=`gawk '/Iterations /{print $0}' hoge.log | gawk 'BEGIN{FS=" "}{print ($4)}'`
a=`expr 3 '*' $a`
[code]...
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Dec 9, 2010
In my book, this is an example of a recursive algorithm:
var reverseArray = function(x,indx,str) {
return indx == 0 ? str : reverseArray(x,--indx,(str+= " " + x[indx])) ;; }
var arr = new Array('apple','orange','peach','lime');
var str = reverseArray(arr,arr.length,"");
alert(str) ;
I'm trying to understand it, I'm stuck at the (str+= " " + x[indx])) part - that part of the function definition expects an ARGUMENT, am I right? What's being passed to it is a bit of PROGRAM, the str+= stuff. So - how is it working?
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Aug 25, 2010
I have just started using Valgrind,which really is great. Most of the reported errors look kinda weird, though I can't really understand what's going on here, for example:
==00:00:02:52.033 7754== Invalid read of size 4
==00:00:02:52.033 7754== at 0x80B0987: MyCls::MyPrintf(long, char*, ...) (MyCls.cpp:270) ...
==00:00:02:52.033 7754== Address 0x47a5ee8 is 0 bytes after a block of size 296 alloc'd ...
==00:00:02:52.033 7754== by 0x809A6C1: ClsMain::taskRun(int, char**) (ClsMain.cpp:177)
==00:00:02:52.033 7754== by 0x816CFE8: main (main-C.cpp:2060)
==7754== ---- Attach to debugger ? --- [Return/N/n/Y/y/C/c] ---- Y
==00:00:02:57.410 7754== starting debugger with cmd: /usr/bin/gdb -nw /proc/7765/fd/1014 7765
GNU gdb Red Hat Linux (6.5-25.el5rh)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as
"i386-redhat-linux-gnu"...Using host libthread_db library "/lib/libthread_db.so.1".
Attaching to program: /proc/7765/fd/1014, process 7765
MyCls::MyPrintf (this=0x47a5dc0, iPrm=3,
sMsg=0x6974320 "blablabla"...) at MyCls.cpp:270
270 cout<<endl<<"m_FilePtr="<<hex<<m_FilePtr<<dec<<endl;
Basically, Valgrind reported the "Invalid Read" error at line 270 of file MyCls.cpp, which is simply a cout of the m_FilePtr variable, which is a member variable of the MyCls class. It's a FILE* variable I use to write repeatedly on a text file. The address reported (0x47a5ee8) is 296 bytes after the "this" pointer (0x47a5dc0),as Valgrind correctly tells me but I honestly don't understand that. And of course, I need to read that variable, not only for the cout (indeed,the error is reported at every reading attempt). Besides, the application doesn't crash, but still I would like to understand if I really have to worry about this "error".
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Mar 4, 2011
I am unable to understand the highlighted code/syntax here and what do variable names starting with an underscore represent?
Code:
#include <iostream>
template <class Class, typename ReturnType, typename Parameter>
[code]....
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Oct 18, 2010
I have got a program using semctl(). I cant understand the value returned by semctl using GETPID option and its difference with the actual pid obtined by getpid()as in the following code:
Code:
int semid,retval;
semid=semget(0*20,1,0666 | IPC_CREAT);
retval = semctl(semid,0,GETPID,0);
[code]....
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Jun 4, 2010
I am getting shift/reduce and reduce/reduce conflict in my yacc grammar code. yacc generates (i.e yacc -d -v parser.y) its grammar and state information in the parser.output file.
How can i interpret the below information and understand which grammar state is conflicting with other grammar state? Please help me to understand.
State 159 conflicts: 1 shift/reduce
State 1863 conflicts: 1 shift/reduce
State 1865 conflicts: 1 shift/reduce
State 1960 conflicts: 1 shift/reduce
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Nov 12, 2010
Currently i'm doing a script for my project and I want to prevent people from exiting the terminal by clicking the "X" at the top right. when I run the script, user cannot exit out of the terminal unless the scipt finish running.
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Apr 14, 2010
Does anybody installed PeopleSoft People Tools 8.50 on Red Hat Lunux. If yes can you list challenges you have been faced and any spcific kernel settings you did to make peoplesoft works. We are in the process of installing PeopleTools on LINUX.
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Dec 2, 2010
I am a linux newbie (more so with using RedHat). I am trying to use yum to install packages, but have never really able to get this thing right. I want to install libXp-devel package. However, running yum install libXp-devel doesn't work.
When I downloaded the rpm for libXp-devel and tried to run yum install libXp-devel-1.0.0-8.1.el5.x86_64.rpm, I get the following:
Code:
Resolving Dependencies
--> Running transaction check
---> Package libXp-devel.x86_64 0:1.0.0-8.1.el5 set to be updated
--> Processing Dependency: libXp = 1.0.0-8.1.el5 for package: libXp-devel
--> Processing Dependency: libXau-devel for package: libXp-devel
[code]...
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Dec 21, 2010
i need to send a list of tasks each morning from a document to my team and i wanna do this from home; the thing is that i can only access my pc via ssh and i have to type the command for each person and takes to damn long. What i want is to send the document to a list of emails using only one command or a script.
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Aug 23, 2010
I am anticipating that someone could give more further information about that, not only simple explanations. How to understand User Time, sys time, wait time, idle time of CPU
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Jul 14, 2009
I am facing a really weird kind of issues where my boss has asked me block everybody from changing their wallpapers and put a default one there.
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Aug 9, 2011
Does anyone know how to contact the people at bugs.kde.org ?I have tried to register but the site is not excepting the @ in my email adress.As a result, I never get the logon info.
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Jul 18, 2010
Just incase anyone is suffering from the same problem as I was after upgrading to 11.3 that there was no such file or directory in /var/lib/nxserver/db/running/sessionID. I found the answer in another forum and thought i would post it here. Basically there is a change in the openssl library used to calculate the md5sum used by nx which stopped it from connecting.
Putting
COMMAND_MD5SUM="md5sum"
at the end of /etc/nxserver/node.conf fixes the problem.
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Mar 7, 2010
I'm using Ubuntu 9.10 (2.6.31-20-generic) and I've installed my camera (Microdia Win2 PC Camera 0c45:613b) and it works fine and everything locally. But as soon as it connects to a contact on MSN or skype and I've tried a web chatroom aswell. and same issue.
Now is it the Camera? 'Coz when I've had the cam installed on Windows XP it wouldn't work on MSN either. But if it the camera then, why does it work locally like it should on the net....
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Jul 10, 2010
i'm trying to find a convenient way to share files without having to upload to a server via FTP. i suppose ubuntuone might work, but i have no idea whether the files can be made public
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Jan 1, 2011
I was wondering how can I see who is using my wireless router to connect to my Internet connection, and how can I block them so they can't access it.
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Aug 7, 2010
What do people generally do with FLAC files? Do they directly play them either with a stand-alone player or with the computer or, on the contrary, they first create audio CDs with them? Please understand my post is not about not knowing what a FLAC file is. I've used programs that create an audio CD from a FLAC file many times and also, others that haven't been converted, I play them directly.
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Nov 15, 2010
I've noticed a lot of this sort of thing in the torrent details.
Code:
d: We'd download from this peer if they'd let us U: Uploading to this peer Is there any way to set it up to ban those kind of people? I have no want to upload to people who block downloads. I can iptables each IP, but that's a hassle.
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Dec 10, 2009
I am using centos 5.4, recently i come to know that people are'nt able to connect to my system using ssh.1. but i can easily connect to them. 2. I checked the firewall settings also, it seems ok to me.3. I tried restarting sshd also. " /etc/init.d/sshd restart " but to no avail.4. Before when i was using 5.3, it was not a problem..!!5. I tried the following command on other system. It shows the following output.
# ssh -v -l niks 43.88.101.99
OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
debug1: Reading configuration data /etc/ssh/ssh_config
[code]....
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Mar 29, 2011
(inside R) I am using system.time function to measure the execution time of two functions
> system.time(lapply(seq(1:1000000),returni))
user system elapsed
0.982 0.100 1.057
[code]....
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Oct 19, 2010
I cant understand y there is no dock option in this
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Apr 19, 2011
I'm in way over my head and have absolutely no idea what I am doing.I set up a lamp server earlier today on ubuntu 10.10 and I'm trying to upload files to wordpress which I installed at local host using vsftpd. I am so lost.Something about this entire process has not clicked in my head;
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Apr 28, 2011
In the beginning there is MBR. MBR looks for the active partition and tranfers control to the VBR of the active partition. MBR is where grub may be installed. which allows the user to choose an OS(a VBR) I am not sure what the program in the VBR does,but it manages to loads the OS. What am I trying to do: Backup. I ma tired of losign my partitions my bootloaders. I want to backup them all! partitions/MBR /VBR everything short of creating an disk image.
My questions:
1. say the ubuntu partition is formatted, will grub still load? if not is there a bootloader that would?am I making sense? i hope so...
2. what exactly does the VBR contain ?
2. How do I go about backing up? The mbr and the partiton table are backed up with a simple dd command. Then what else needs to be backed ? VBR's of every partition?
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Aug 9, 2011
I have taken putty session of a server from two separate machines namely HOST1(3 sessions) and HOST2(1 Session) . However w command says there are 5 users
Code:
# w
09:29:36 up 34 days, 15:48, 5 users, load average: 0.62, 4.33, 8.16
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/17 HOST1 09:18 4:26 0.01s 0.01s -bash
root pts/18 HOST1 09:27 1:21 0.00s 0.00s -bash
root pts/21 HOST2 09:29 0.00s 0.00s 0.00s w
root pts/20 HOST1 09:29 1:39 0.00s 0.00s -bash
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May 23, 2011
This problem is occurring on Red Hat EL 5 WS. However, I have two CentOS 5 systems, with similar configuration to RH EL 5, where this problem does not occur.
I am getting this error:
Can't exec "sendmail": No such file or directory at ./0logwatch line 1018, <TESTFILE> line 1.
Can't execute sendmail -t: No such file or directory
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Sep 20, 2010
I don't understand the output from 'free' cmd.
[Code]....
WHy in first line in columns representing 'used', 'free', 'buffers', 'cached' are such values? I can't count them properly.
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Mar 19, 2009
I'm doing a research to protect my pc from physical access. What I'm facing here is that my company created a program for fedora 8 and plans to sell the unit away. We created a function where you can configure the program using any web browser from a network so we do not want anybody to have access to the fedora except for out personnel.
Based on my research, I've found [URL] this guide to protect people from accessing grub and single user. I am currently researching on preventing others to clone the harddisk. I would like to know if there are any other methods to prevent people from unauthorized access to fedora.
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