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  • x86 Instruction Format: "ba 0e 00 00 00" ... "mov $0xe,%edx"

    - by Andrew Tomazos - Fathomling
    I'm getting the following line in the disassembly from objdump -d of an x86 linux program... 4000b0: ba 0e 00 00 00 mov $0xe,%edx I'm trying to understand how the machine code "ba 0e 00 00 00" maps to "mov $0xe,%edx" In the manual move immediate 32-bit is: B8 + rd ... MOV r32, imm32 ie "B8" not "BA" In fact none of the MOV opcodes are "BA". If someone could break down "ba 0e 00 00 00" and explain bit-wise how to get to "mov $0xe,%edx" it would be most helpful.

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  • Load balanced proxies to avoid an API request limit

    - by ClickClickClick
    There is a certain API out there which limits the number of requests per day per IP. My plan is to create a bunch of EC2 instances with elastic IPs to sidestep the limitation. I'm familiar with EC2 and am just interested in the configuration of the proxies and a software load balancer. I think I want to run a simple TCP Proxy on each instance and a software load balancer on the machine I will be requesting from. Something that allows the following to return a response from a different IP (round robin, availability, doesn't really matter..) eg. curl http://www.bbc.co.uk -x http://myproxyloadbalancer:port Could anyone recommend a combination of software or even a link to an article that details a pleasing way to pull it off? (My client won't be curl but is proxy aware.. I'll be making the requests from a Ruby script..)

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  • Stored Procedure in postgresql, multiple queries w/ agreggates.

    - by fenix
    I'm trying to write a store procedure that can take some input parameters (obviously), run multiple queries against those, taking the output from those and doing calculations, and from those calculations and the original queries, outputting a formatted text string like: Number of Rows for max(Z) matching condition x and y of total rows matching x (x&y/x*100). To explain the max(Z) bit, this will be the username field, it won't matter which actual entry is picked, because the where clause will filter the results by user id, is there a saner way to do this?

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  • hidden folders in Internet

    - by lego69
    very often in Internet I see links like this: www.abcde.com/~main/material/hello and this part ~main/material/hello is grey, if I remove hello I receive access forbidden, can somebody explain, what is this system, and is it possible receive access?

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  • C# Why does code compile fine when there is an ambiguous virtual method?

    - by Jimbo
    I have a class (Class B) that inherits another class (Class A) that contains virtual methods. Mistakenly, I omitted the override keyword when declaring a (supposed to be) overriding method in Class B. Class A public class ClassA{ public virtual void TestMethod(){ } } Class B public class ClassB : ClassA{ public void TestMethod(){ } } The code compiled without a problem. Can anyone explain why?

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  • Use `dd` linux program to save / recover a disk's MBR

    - by Graduate
    I have an Ubuntu OS installed on my laptop. I want to install Windows 7 as well to another disk partition (I will do it by recovering it from a special partition on my laptop). After installing Windows, I want to recover my hard drive MBR to be able to load Ubuntu. I have a plan to use linux dd program: 1) (Before installing, perform this command in Linux) dd if=/dev/sda of=/home/user/mbr_backup bs=512 count=1 2) (after installing, load Ubuntu Live CD and launch this) dd if=/home/user/mbr_backup of=/dev/sda bs=512 count=1 3) Load Ubuntu on PC and re-configure the GRUB2 to be able start Windows I need your advice, I want to be sure I won't damage the disk (it's partition table).

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  • Single PC Satellite Office Firewall

    - by Carl
    We are setting up a small, single PC office about 200 miles away. We plan on getting a cable internet connection but need some advice on a sufficient firewall. We would like to keep it under $100 if possible. 2 options we are considering are: Cisco RVS4000 (got some bad reviews) Linksys WRT120N (running DD-WRT) We need the ability for VPN but other than that we don't need anything special. We just want to keep that PC as safe as possible but easily maintainable because most work will be done remotely. What suggestions or solutions can you recommend for this application?

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  • Inserting "£" in a string to a text file

    - by Harry
    iPhone Application writes data to a text file, saves it on the Documnets folder. Great that works If I place "£" in the string, or use [currencyStyle stringFromNumber] the text file will not be created. The "£" and the [currencyStyle stringFromNumber] works if the information is printed to a "New View" page on the simulator, pound and all Can someone please explain what's happening?

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  • very confused please answer [closed]

    - by davit-datuashvili
    hi i am very surpise when somebody post question everybody are saying it is homework please show us your effort now i have done this code http://stackoverflow.com/questions/2902781/priority-queue-implementation question is is this implementation correct? and nobody tell me answer also this one http://stackoverflow.com/questions/2896811/question-about-siftdown-operation-on-heap-closed can anybody explain me what is happened?no one answer me why?

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  • ASP.NET C# Sending Information Back to Client While Processing Web Page

    - by user204588
    Hi, Not sure if I'll explain this properly but here goes. I having written an asp.net app using C# for the code behind. After the user makes some selection and hits the "run" button I pass off the processing to a dll written in C# but what I want is a way to periodically send information back to the client so they can see what's going on like how many records have been processed and things like that. How can I accomplish this? thanks

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  • Mac OS X: getting file system changes of the last minute?

    - by Patrick
    From older times (Mac OS 10.4) I had found this command line on the web somewhere: mdfind '(kMDItemFSContentChangeDate >= $time.now(-60)) && (kMDItemFSContentChangeDate <= $time.now)' it gave me a list of files that where changed in the last minute. This does not work anymore on Mac OS 10.6. Can anybody explain why this doesn't work? And even suggest a working command line?

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  • How do I sync a subset of tables between two databases on the same mysql database server

    - by Mike
    would like to be able to sync a subset of tables between two mysql databases that are running on the same server. One of the databases acts as the master where inserts, updates and deletes can be made. The second database uses those same tables for read-only operations. I do not want to use federated tables to achieve this. The long term goal will be to separate the 2 databases to multiple servers, The second database that has the subset of tables as read-only may also be replicated a few times over to distribute geographically for load and performance purposes each with unqiue data.... Once that is achieved, I plan to use binlog to replicate those specific tables on the secondary databases. In the meantime, I'd like to keep these tables in sync. Is there a more elegant way to do this than other than using a cronjob and mysqldump?

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  • Why does this eval not work in Ruby

    - by Anil
    Can you explain this? I want to eval values and calculations from two different sources. One source gives me the following info(programmatically): 'a = 2' The second source gives me this expression to evaluate: 'a + 3' This works: a = 2 eval 'a + 3' This also works: eval 'a = 2; a + 3' But what I really need is this, and it doesn't work: eval 'a = 2' eval 'a + 3' I would like to understand the difference, and how can I make the last option work. Thanks for your help.

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  • Usage of Native in Java.

    - by vaibhav
    I am basically a web application developer, never in my career got a chance of trying out this.. can someone explain the whys and the wherefores for using Native code in java? Thanks a Ton in advance!

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  • compiling a c++ program including mysql

    - by wyatt
    I'm new to gcc, and trying to compile a c++ program which includes mysql.h using the command: g++ -o test test.cpp -L/usr/include/mysql -lmysqlclient -I/usr/include/mysql It works without issue, but I was wondering if someone could explain the arguments to me. I don't like using commands I don't understand. Thanks

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