C Programming, Disassembly, Debugging, Linux, GDB

[2012goingNutz]

is that how you get all the women? LMAO loser!

[yullashu]

I subbed, good information mate.

[sebster3gmail]

this is a great video and well explained. thank you very much.

[MotaPratik]

Hii,

Which IDE is this ? during writing program its showing Intelligence also..

[themanyone]

@MotaPratik It is the SciTE text editor. I have just now added that info to the video description.

[geomorillo]

aaaah dissasembling i remember those times.... thanks for this, have to read a lot now...

[AlphaNorcalli]

Emacs for the wolf.

[lukmackul]

what is the cool editor with auto completion feature?

[themanyone]

@KiranaForever Good analogy. =D

[jivealways]

Thanks for this, really helped me transition to gdb

[FOXnewsAlien]

so what is this good for? Its useless babble.

[kotapaka]

what an idiot. Yeah, looking at the asm is very useful for a 5 line program and a tutorial on gdb for beginners

[keirzev]

Thank you for posting such an interesting and inspiring tutorial! I am just getting back into programming and want to experiment with C. You have definitely given me some inspiration to actually learn curiously instead of seriously :). (The former seems to always get me so much further!) Thank you!!!!!!

[osiris1503]

this is a very good tutorial thanks for posting :)

i hope i can learn more from you.

[silverpizza100]

WTF? Try JAVA.

[bblokar1]

@silverpizza100

Enjoy your bloated jre.

[pithikoulis]

@silverpizza100 Java? C is the mother language of all.

[decodedthoughtDT]

how do I like print the nasm file output into another file ?? and also the output of gdb ?

[themanyone]

@decodedthoughtDT Don't you hate it when people say RTFM without providing a link? ManBashRedirect(dot)tk

[decodedthoughtDT]

nice tut thanks

[davidlanham99]

Wow. How do you guys avoid blowing your brains out? This is exciting!

[bulllsize]

I m pursuing Graduation in Computer Science and want to know some answers:

1.Who calls main() and I dont expect OS as answer..plz be specific

2.How does fork() return 2 values being a function?

3.how does fork() return 2 values at 2 places i.e parent(pid of child) and child( return val=0)?

plz urgent help

[themanyone]

@bulllsize I call main(), hehe. OK to be more specific, fork() is not returning 2 values at the same time. It returns the PID of the child process to the parent and that's that. However, if fork() is then called by the child, fork() will return 0 to the child process that called it. This lets the child know that it is the child (in many other respects the child is a copy of the parent). Yep, confusing. They can pay me to use fork(), but I'd rather use popen().

[themanyone]

@bulllsize oops, I mean it's getppid()'s job to tell you who called main(). If you call fork() and it returns 0, that means you are in a child process. You can then call getppid() to get the ID of the parent or who called main. (Again, probably the shell.)

[learnwithtechies]

@bulllsize

For the first question: who calls main:

learnwithtechies(dot)com/index­.php/component/content/article­/4-c/25-who-calls-main-in-c-pr­ogram

[ThunderAppeal]

Very good video, I also get bothered a lot by some of the things I read about C which take for granted that there are people who want to make the connection between the code and how it runs on the machine. The term 'stack' is also an abstract concept with relation to what I think you intended with this video. But thats not a big deal, I'm just being really picky I guess. I've picked up a C book again recently and found this video when searching for C programming. Very good stuff.

[TeenNewsLive]

Where exactly can you learn to do this from please pm me. Really interested but its extremely difficult for me to learn just by watching videos and reading tuts

[themanyone]

@TeenNewsLive I learned by using apropos and reading the man pages for each command and by looking at other people's programs. Most of the C statements also have man pages. The SciTE text editor, most text editors actually, let you highlight a keyword, press F1, and automatically open a man page for it. Remaining questions were answered by web searches. Use the ##C IRC channel web site but not the chat room. They cater to professionals and have a short fuse when it comes to FAQs.

[MakarovD]

i hate c, basic rulez

[NawafLol]

C is better and powerful ,you can make a whole operating system with C !

[coilgunner2]

@NawafLol Yeah I love writing C code in Linux, for some reason I just find if funny that I can be writing code to be run on an OS that was made from the same compiler. Even the same version of the compiler if I really wanted to.

I also have the 0.01 version of the kernel to look over when I'm bored and feel like understanding it a little better.

[0121ryanh117]

for 64 bit numbers you can use __int64. Just thought id throw that in their.

[jayagk]

Great video

[vincjenzo]

Hi,very nice video! Can you make a tutorial on buffer overflows and exploiting them?

[ChaperonNoir]

WoW. I am seeing this right but a wide character is 4 bytes on Linux? (32 bits!!)

What the hell.

[gerbrandt92]

Isnt' it also 4 bytes on windows? wchars are used for unicode and unucode has quite a lot of characters.

[themanyone]

wchar_t is implementation defined. Windows defines it as 16 bit. Doesn't really matter though, unless you're looking at the debugger or maybe doing something you shouldn't... The pointer (wchar_t *) is of course a 32 bit pointer (or 64 bit pointer on a 64 bit implementation) that points to the (implementation-defined) data type (usually 16 or 32 bits, but could be anything. Only reason I used it was to figure out some other programs that use that data type and compare them to this.

[Sotacap]

Nice dude! At last someone who uses GDB lol.

[themanyone]

Thanks. I should have probably mentioned valgrind. It wouldn't be useful here, but it really helped me sort out those memory and threading errors I get from late night stupidity.

[ejmarkow]

Excellent and helpful...thanks! Can you do some more helpful tutorials? Great stuff.

[washumagic]

thank you for doing this. love you man.

[MrApplication]

there are many virsions of c# this is not the c# i know. I know microsoft c#

[MindTrip51]

ok, I'll bite. This is obviously C. Big difference.

You spelled version wrong.

[tunglour]

Pfft, this is C. Not damn C#, nothing to do with M$

[shalola5]

please till me what is the name of this IDE

[themanyone]

It's not an IDE. It's the scite text editor. The LINUX Operating System itself is my Integrated Development Environment (IDE)! I used the Compiz window manager to glue scite and terminal windows together and flip them around in 3D. I also added a bunch of lua script add-ons from the scite lua script page. All free.

[ZeeManDWeasel]

@themanyone

Any chance of a link to the scite lua scripts you used? Looking for a feature to provide something similar to intellisense in visual studio. pls? :)

[themanyone]

@ZeeManDWeasel I lost the lua wiki link for a while. Finally found it by searching google for scite lua users wiki. I contributed 4 or 5 of them myself!

[Pablos544]

Didn't get why you used hexdump. What was that doing?

[themanyone]

I am preparing to crack some anti debugger code.

[Pablos544]

I used Turbo Debugger a lot in MS-DOS days, gdb is a simple version, command version, and I heard of ELF on Linux, and I can see what you were doing by anti-debugging with hexdump, but what on earth is ndisasm? I didnt get that.

[themanyone]

ndisasm comes bundled with the Netwide Assembler (nasm) package.

[lalitsrana]

Nicely done, thanks..

[themanyone]

There are much better videos on gdb, conditional breakpoints and such. I only had time to touch on a few tools. Also forgot to mention that the terminal should support wide character streams (most do, although gdb doesn't appear to yet...)