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  • Reliance on the compiler

    - by koan
    I've been programming in C and C++ for some time, although I would say I'm far from being expert. For some time I've been using various strategies to develop my code such as unit tests, test driven design, code reviews and so on. When I wrote my first programs in BASIC I typed in long listings before finding they would not run and they were a nightmare to debug. So I learnt to write a small bit and then test it. These days I often find myself repeatedly writing a small bit of code then using the compiler to find all the mistakes. That's OK if it picks up a typo but when you start adjusting the parameters types etc just to make it compile you can screw up the design. It also seems that the compiler is creeping into the design process when it should only be used for checking syntax. There's a danger here of over reliance on the compiler to make my programs better. Are there better strategies than this ? I vaguely remember some time ago an article on a company developing a type of C compiler where an extra header file also specified the prototypes. The idea was that inconsistencies in the API definition would be easier to catch if you had to define it twice in different ways.

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  • Windows 7 booting and startup repair issues

    - by aardvark
    I have a MSI FR720 laptop with Windows 7 and Lubuntu partions. For quite a while (6 months or so) I've been having issues booting from my hard drive, it'd take me between 5 minutes and several hours for me to be able to have it recognize the hard drive as a bootable device. I did several disk checks on it, and my hard drive seems in perfect condition, and the fact that booting would usually only work after removing the hard drive and trying to reset it in its slot or lightly shaking it makes me think it had something to do with the connection in the hard drive slot as opposed to the hard drive itself. I was having particular issues with it detecting the hard drive today so I decided to try booting it from an external hard drive dock. It detected it first try and so far has had no problems finding the bootable partitions on my hard drive. When I selected my Windows 7 partition from the boot menu it said that it hadn't been shut down properly last time and needed startup repair. I've done this several times over the last 6 months, so this is hardly unusual. I do startup repair, it fails, and then I try to do a system restore. The system restore also failed, and it says that no files were changed. I restart and try it again. However, this time when I get to the startup repair it's not detecting a Windows OS. I tried clicking next and doing a startup repair but the repair is always failing. If I ignore the startup repair option and instead select "Launch windows normally" it will get to the windows animation, stop halfway through and then crash into a BSoD. I can't read the error on the screen because it immediately switches to back and tries to restart. This is my first time asking a question like this online, so let me know if I need to provide any extra information and I'll do my best to give it I tried using diskpart to find the list of partitions and see if one's labelled as an active partition, but it says that no disk were detected. I can run Lubuntu just fine. I can also see all of my Windows 7 files from it EDIT: The startup repair diagnosis and repair log is this: -- Number of repair attempts: 1 Session details System Disk = Windows directory = AutoChk Run = 0 Number of root causes = 1 Test Performed: Name: Check for updates Result: Completed successfully. Error code = 0x0 Time taken = 15ms Test Performed: Name: System disk test Result: Completed successfully. Error code = 0x0 Time taken = 31ms Root cause found. If a hard disk is installed, it is not responding. -- Any chance that this is a result of me doing this through an external dock through a USB drive?

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  • Fedora: "Login Incorrect"

    - by darkblackcorner
    I've just set up a minimal install on my netbook (the default was too resource hungry, so I figured I'd customize the install and learn something about linux at the same time!) No problems logging in as root, but when I create a new user and try to login as them I just get the "Login incorrect" error. I'm certain the password is correct, though the secure log displays an authentication error. Am I missing a permission somewhere? useradd test usermod -p [pwd] test Shell is added automatically I think (checking password file says shell is /bin/bash) I've tried adding the user to the sudo-ers group usermod -a -G wheel which doesn't help. I've kept the password simple in order to rule out human error.

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  • Intel to Unleash Atom-ic Power at Computex

    <b>Hardware Central:</b> "Intel plans to introduce a series of new Atom processors at the opening of the giant Computex show in Taipei this week, as well as offer a preview a number of other offerings. But Atom will be the star of the show."

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  • postfix + mysql, user unknown

    - by stoned
    I have installed postfix with dovecot and postfix admin and all seemed well at the beginning. I can log in with thunderbird and check the mailboxes (all empty now) and TRY to send mail, even TLS works. The problem comes when I try to send mail. This is the output of mail.log when I try to send mail from an address to the same address: Nov 23 16:41:55 mailforge postfix/local[6322]: 297792467C: to=, relay=local, delay=0.01, delays=0/0/0/0.01, dsn=5.1.1, status=bounced (unknown user: "test") Nov 23 16:41:55 mailforge postfix/qmgr[6293]: 297792467C: removed To me it looks like as if postfix tries to look for the user "test" while in the mysql database users are named as [email protected] . Where should I change this behaviour?

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  • In a GUI based Application in Linux It is working properly in some systems,But segmentation fault (Because of SIGSEGV signal) is coming in others.Why? [closed]

    - by Sreejith
    The application consists of Driver code,a Source Object file(.so) ,and a Application code to interact with a hardware Card.. The problem comes in a mmap().It reads address from a card. But it is not getting the correct address in some systems.The Error is because of It is receiving a SIGSEGV signal and segmentation fault followed to that.But in some system which having the same version of kernel is not at all facing the problem and working properly. So please any one suggest the Reason and Remedy for this Problem.

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  • How to change memory for DomU runtime

    - by saffron
    I have a xen server with xen-4.1.3, linux-image-3.2.0-3-amd64, debian squeeze and 16Gb of RAM. The domain-0 has 1Gb of ram, the rest of memory belongs to the hypervisor. I want to start a guest domain with a minimal amount of memory and increase it runtime later. When I start a guest domain with 256Mb of ram and run xm mem-set domu 4Gb, I get ~3Gb only in domu and a guest domain free says: root@test:~# free total used free shared buffers cached Mem: 2830620 72868 2757752 0 2432 43504 -/+ buffers/cache: 26932 2803688 Swap: 1048572 0 1048572 And a guest domain dmesg says: [ 0.000000] Memory: 175912k/2883584k available (3527k kernel code, 448k absent, 2707224k reserved, 3210k data, 612k init) When I start a guest domain with 2Gb of ram I can run xm mem-set domu 7Gb and get ~7Gb of ram in a guest domain: root@test:~# free total used free shared buffers cached Mem: 6828228 74944 6753284 0 1328 12568 -/+ buffers/cache: 61048 6767180 Swap: 1048572 0 1048572 And a guest domain dmesg: [ 0.000000] Memory: 1674960k/16651264k available (3527k kernel code, 448k absent, 14975856k reserved, 3210k data, 612k init) How can I start a guest domain with a minimal amount of ram (256Mb) and increase it under 15Gb?

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  • Down to the Wire - Yet More Solaris Things to See at OpenWorld (and JavaOne!)

    - by Larry Wake
    San Francisco is bracing for the annual invasion. The airport's jammed, the tweets are flying, and the numbers are crazy: more than 50,000 attendees and 2,500+ sessions, taking over Moscone Convention Center, two streets, Union Square, and seemingly every hotel in town (98,000 hotel room nights). So yeah, it's busy. And it's not just OpenWorld--we've also got JavaOne, MySQL Connect, and four other sub-events going on as well. Speaking of JavaOne, you can find Solaris-related activity there, too -- I've highlighted one hands-on lab below. Here's a last pre-event roundup of activities for consideration; enjoy the show(s)! (Remember, Schedule Builder is your friend; use it with the session numbers below to register.) Monday, October 1st: 3:15 PM - General Session: Accelerate Your Business with the Oracle Hardware Advantage(GEN9691, Moscone North Hall D) John Fowler, head of Oracle's Systems organization, will talk about Oracle hardware technology and how it's co-engineered with other key technologies, including Oracle Solaris. Tuesday, October 2nd: 10:15 AM - Building an IaaS Platform with SPARC, Oracle Solaris 11, and Oracle VM Server for SPARC(CON4431, Moscone South 270)Get the birds-eye lowdown (whatever that means) on how U.S. Cellular  built its Infrastructure as a Service (IaaS) cloud delivery platform with Oracle’s SPARC T4 servers, Oracle Solaris 11, Oracle Solaris Cluster 4, and Oracle VM Server for SPARC. The session covers the high-level design, business case made, implementation details, and lessons learned. 11:45 AM - Oracle Solaris 11 Panel: Insights and Directions from Oracle Solaris Core Engineering(CON8790, Moscone South 252) This has been one of the livelier Solaris-related sessions in years past (and I'm not saying that just because I get to moderate it this year). A panel of core engineers responsible for a wide range of key Solaris technologies will talk about some of the interesting work they've been doing -- but mostly we keep time open for the panel to take questions from attendees, because that's the fun part. Wednesday, October 3rd: 10:00 AM - Tracing Your Java Application Tuning on Oracle Solaris with DTrace(HOL10214, Hilton San Francisco, Franciscan A/B/C/D) This JavaOne hands-on lab will show how to use the DTrace framework to dynamically trace your Java applications on Oracle Solaris and uncover new tuning opportunities. Thursday, October 4th: 12:45 PM - Oracle Solaris 11: Optimized for Oracle Database, Oracle WebLogic Server, and Java(CON8800, Moscone South 252) Explore how Oracle Solaris 11 has been built to be the best platform for the cloud and enterprise applications, with built-in optimizations to improve performance and deliver unique functionality with Oracle Database, Oracle WebLogic Server, and Java.

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  • Tool to automate basic connectivity testing

    - by feicipet
    After our vendors have setup a certain test environment, we need to go in to perform connectivity testing between PC to servers and also between servers. The problem is that we run a range of tests to telnet between 2 nodes on several ports and this is a manual and rather tedious process. Does anyone know of a small tool or script that I can take input on the range of ports to be test and will run an automated range of testing against those ports? All I need to do is to validate whether a TCP connection can be established from the source PC / server to the target server IP address / port. Thanks, Wong

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  • How do I configure upstart to run a script on shutdown when the process takes longer than 10secs?

    - by Tiris
    I am running ubuntu 11.10 in a virtual machine (VirtualBox) to learn more about development in linux. I am using a git repository to save my work and have written a script to bundle my work up and save it to the shared folder for use while the virtual machine is not running. I would like to automatically run this script before shutdown so that my work is always available if the vm is off (currently I have to manually run the script). I don't know if upstart is the best way to accomplish this, but this is the config that I wrote as a test: description "test script to run at shutdown" start on runlevel [056] task script touch /media/sf_LinuxEducation/start sleep 15 touch /media/sf_LinuxEducation/start-long end script pre-start script touch /media/sf_LinuxEducation/pre-start sleep 15 touch /media/sf_LinuxEducation/pre-start-long end script post-start script touch /media/sf_LinuxEducation/post-start sleep 15 touch /media/sf_LinuxEducation/post-start-long end script pre-stop script touch /media/sf_LinuxEducation/pre-stop sleep 15 touch /media/sf_LinuxEducation/pre-stop-long end script post-stop script touch /media/sf_LinuxEducation/post-stop sleep 15 touch /media/sf_LinuxEducation/post-stop-long end script The result is that only one touch is accomplished (the first touch in pre-start). What do I need to change to see one of the touches after the sleep to work? Or Is there an easier way to get this accomplished? Thanks in advance.

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  • Debian SMB share having permission issues in windows 7

    - by xxpor
    Hi Everyone, I setup a Debian squeeze server with samba. I then shared my /media directory with the following configuration: [media] comment=Hard Drives read only = no locking = no path = /media guest ok = yes browsable = yes directory mask = 0777 When the drives are mapped in Windows 7, the user can write to all of the subdirectories of media (sdb1, sdc1, etc), but cannot write to any folders that they create themselves in the subdirectories of media. For example, if the user mapped /media/sdb1 to Z:, and then creates a folder Z:\test, the folder is created successfully, but no files can be written to Z:\test. If the user ssh's into the server, they have no problems writing to these directories. I have included the screenshots, in order, of what happens on Windows. This samba share is mounted with ntfs-3g, if it makes a difference. Screenshots are here

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  • Horrible time with WAMP, Joomla and Windows 7 (Permissions)

    - by jax
    I have WAMP and Joomla installed on Windows 7. I have made a virtual host outside of the www directory that houses a test joomla site. I have also made a joomla component that I want to install and test on this virtual host. I am having constant problems with permissions. I have given all users full access to the folder containing the files under the security Tab in Win7. It seems to me that when (Apache/PHP) creates a file it put restrictions on the permissions which does not allow it to delete or edit the file anymore so I have to manually go and delete the files when I want to uninstall my component. Also, I cannot install the .zip - instead I have to unzip manually to the tmp folder because when I upload the zip in the Joomla Installer I get the same permissions problems as above. How can I get rid of these issues once an for all?

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  • Insanity Day 3

    - by D'Arcy Lussier
    So on Tuesday (Sept 25th) I did my 2nd Insanity workout (for those keeping track, I’m not counting the fit test as #1) and it was MURDER on my legs. I wasn’t able to get to it yesterday, and I’m noticing a trend in this first week – I can easily push to do it every 2nd day, but life is just too crazy busy right now (yeah yeah, excuses right? I look at it more like priorities – I have a tech conference I’m running next week, crazy days right now). Today I moved to the 3rd workout – but honestly I couldn’t get into it. It was the cardio recovery day, which is a lot of stretching and stuff. I think if I had been doing the first two sessions back to back I’d need it, but I didn’t want to cool down today – I wanted to push! So I moved to the next DVD in the series but for some reason couldn’t get it to run on my computer, even with SlyDVD. So – back to Disc 1 and the Plyometric Cardio Circuit! Fantastic workout again this morning. Don’t get me wrong, I’m not all of a sudden in amazing shape, but I am noticing already that I seem to be somewhat better – I’m really looking forward to my next fit test at the end of the month!

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  • How to rsync just the current folder?

    - by Michael
    I want to sync some files from a remote server to my local computer. How can I make rsync to just copy the files with a certain file extension in the directory but no subdirectories? I assumed this to be an easy task, but embarassingly I'm not getting it for nearly 2 hours. So could someone give me an example? I did various experiments with something like the following command: rsync -a --include=what? --exclude=what? -e ssh [email protected]:/test /test

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  • Getting current time in milliseconds

    - by user90293423
    How to get the current time in milliseconds? I'm working on a hacking simulation game and when ever someone connects to another computer/NPC, a login screen popups with a button on the side called BruteForce. When BruteForce is clicked, what i want the program to do is, calculate how many seconds cracking the password is going to take based on the player's CPU speed but that's the easy part. The hard part is i want to enter a character in the password's box every X milliseconds based on a TimeToCrack divided by PasswordLength formula. But since i don't know how to find how many milliseconds have elapsed since the second has passed, the program waits until the CurrentTime is higher than the TimeBeforeTheLoopStarted + HowLongItTakesToTypeaCharacter which is always going to be a second. How would you handle my problems? I've commented the game breaking part. std::vector<QString> hardware = user.getHardware(); QString CPU = hardware[0]; unsigned short Speed = 0; if(CPU == "OMG SingleCore 1.8GHZ"){ Speed = 2; } const short passwordLength = password.length(); /* It's equal to 16 */ int Time = passwordLength / Speed; double TypeSpeed = Time / passwordLength; time_t t = time(0); struct tm * now = localtime(&t); unsigned short EndTime = (now->tm_sec + Time) % 60; unsigned short CurrentTime = 0; short i = passwordLength - 1; do{ t = time(0); now = localtime(&t); CurrentTime = now->tm_sec; do{ t = time(0); now = localtime(&t); }while(now->tm_sec < CurrentTime + TypeSpeed); /* Highly flawed */ /* Do this while your integer value is under this double value */ QString tempPass = password; tempPass.chop(i); ui->lineEdit_2->setText(tempPass); i--; }while(CurrentTime != EndTime);

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  • My Computer will not turn on?

    - by user269120
    I recently built a gaming pc. It was working fine before the following events: I installed a graphics card driver update then: in windows it said that the user experience index needed to be refreshed, so i started the test and somewhere in the middle of the test my pc just switched off. No shutting down just stopped. Now it won't turn back on. I have checked its plugged in and the switch on psu is down, i tried a different power cable and i checked all the connections. When i press the power button nothing happens, no fans no lights no post beep. Computer Parts: Motherboard: Gigabyte GA78LMT-USB3 CPU: AMD FX-6350 @ 3.9 Ghz RAM: 2x4gb Crucial Ballistix Sport Power Supply: Tesla 750w psu Graphics card: XFX Radeon 7870 DD Case: CiT Vantage R Gaming Case Hard Drive: 2TB Western Digital Caviar Green Please help me, this computer is only a week old since i built it. All anwsers are appreciated :)

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  • trying to copy security groups to a user using dsmod group utility in AD

    - by newbie
    i am trying to create a batch file that asks to enter source samid and destination samid. then using dsquery and dsget find out what security groups source samid is assigned to and assign destination samid to those security groups using dsmod. everything works except the dsmod group command. it doesnt do anything and batch file stops. if i literally put "CN=marketing,OU=test group,DC=abc,DC=com" instead of %%g and "CN=test1,OU=test group,DC=abc,DC=com" instead of %dusercn%, it works fine. can anyone help with this? i have pasted my scrip here. this last small thing is killing me. echo off echo %date% at %time% set /p susername=enter source user name: set /P dusername=enter destination user name: echo %susername% echo %dusername% set dusercn= %dusercn%=dsquery user -samid %dusername% echo %dusercn% for /f "tokens=*" %%g in ('dsquery user -samid %susername% ^|dsget user -memberof') do (dsmod group %%g -addmbr %dusercn%) echo completed pause

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  • An In-depth Look at Gentoo Linux

    <b>Kernel News:</b> "Imagine an Operating System that only includes the features that you actually want and use. An Operating System that is finely tuned to your computer hardware. One that doesn't include any resource hogging applications that you don't need such as "Desktop Search" or huge bloated software..."

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  • Large OSX 10.6 to Windows 7 smb transfers fail?

    - by user41724
    I'm connecting to a windows 7 box from a OSX 10.6 box via smb: smb://ftp1 Connection works fine, I can transfer individual files one at a time, but as soon as I try and move an entier folder I get the following error: The Finder can’t complete the operation because some data in “test” can’t be read or written. (Error code -36) This error happens on all our OSX boxes when trying to push the entier folder to the Win7 box. The folder TEST in the above error message has -R 777 permissions. I can move every image file to the windows box one by one with no errors. But if I try an move the entier folder. bam error out. This error seems to kill the smb client on the Windows box as well. There's an FTP server on the windows box and I can FTP in from the OSX box and move everything just fine. Not sure what is going on here?

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  • Netbook Buying Guide

    The plethora of netbook choices may appear remarkably similar, yet the differences in hardware make all the difference for the busy professional. Here are some tips on selecting the best netbook for your needs.

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  • The Perfect Desktop - Kubuntu 10.04

    <b>Howtoforge:</b> "This tutorial shows how you can set up a Kubuntu 10.04 desktop that is a full-fledged replacement for a Windows desktop, i.e. that has all the software that people need to do the things they do on their Windows desktops. The advantages are clear: you get a secure system without DRM restrictions that works even on old hardware"

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  • What's the lightest Ubuntu desktop environment? [duplicate]

    - by user242125
    This question already has an answer here: How do I find out which version and derivative of Ubuntu is right for my hardware in terms of minimal system requirements? 5 answers My computer has 1GB ram and a very low graphic card, but I don't know how much powerful it is. My computer is very slow with Ubuntu Unity and I saw that there are many desktop environments which are much faster, even for a slow computer. So, what's the lightest desktop environment.

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