Search Results

Search found 16947 results on 678 pages for 'kernel programming'.

Page 31/678 | < Previous Page | 27 28 29 30 31 32 33 34 35 36 37 38  | Next Page >

  • Converting kernel image from ELF to PE

    - by Frank Miller
    I am using Msys to build a home brew kernel that I wrote under Linux. Linux used ELF for its binary format and Msys uses PE. I have the source setup to allow it to be booted by Grub using the Multiboot spec. At the end of the build, I get some undefined symbols: init.o:init.S:(.text+0x14): undefined reference to `edata' main.o:main.c:(.text+0x121): undefined reference to `_alloca' main.o:main.c:(.text+0x126): undefined reference to `__main' ../../lib\libkern.a(mem.o):mem.c:(.text+0x242): undefined reference to `_end' ../../lib\libkern.a(mem.o):mem.c:(.text+0x323): undefined reference to `_end' These appear to be ELF oriented symbols. If anyone can advise me on how these should be dealt with in the PE world, e.g. if there are equivalents, it would help me out a lot!

    Read the article

  • Where does output of print in kernel go?

    - by apoorv020
    I am debugging a driver for linux (specifically ubuntu server 9.04), and there are several printf statements in the code. Where can I view the output of these statements? EDIT1: What i'm trying to do is write to kernel using the proc file-system. The print code is static int proc_fractel_config_write(struct file *file, const char *argbuf, unsigned long count, void *data) { printk(KERN_DEBUG "writing fractel config\n"); ... In kern.log when I see the following message when i try to overwrite the file /proc/net/madwifi/ath1/fractel_config (with varying time of course). [ 8671.924873] proc write [ 8671.924919] Any explainations?

    Read the article

  • Programmatically check whether a linux kernel module exists or not at runtime

    - by dgraziotin
    I am writing a C daemon, which depends on the existence of two kernel modules in order to do its job. The program does not directly use these (or any other) modules. It only needs them to exist. Therefore, I would like to programmatically check whether these modules are already loaded or not, in order to warn the user at runtime. Before I start to do things like parsing /proc/modules or lsmod output, does a utility function already exist somewhere? Something like is_module_loaded(const char* name); I am pretty sure this has been asked before. However, I think I am missing the correct terms to search for this. Thanks!

    Read the article

  • Is it possible to figure out (approximately) what line of source code a kernel module is hung on, fr

    - by Mike Heinz
    I'm trying to debug what appears to be a completion queue issue: Apr 14 18:39:15 ST2035 kernel: Call Trace: Apr 14 18:39:15 ST2035 kernel: [<ffffffff8049b295>] schedule_timeout+0x1e/0xad Apr 14 18:39:15 ST2035 kernel: [<ffffffff8049a81c>] wait_for_common+0xd5/0x13c Apr 14 18:39:15 ST2035 kernel: [<ffffffffa01ca32b>] ib_unregister_mad_agent+0x376/0x4c9 [ib_mad] Apr 14 18:39:16 ST2035 kernel: [<ffffffffa03058f4>] ib_umad_close+0xbd/0xfd Is it possible to turn those hex numbers into something close to line numbers?

    Read the article

  • What are the reasons to select Object Oriented Programming over Procedural Programming?

    - by Starx
    Nowadays, Standard Coding has become Synonymous to Object Oriented Programming. But what are the reasons that forced classical procedural programming out of the way and rose the new concept of Object Oriented Programming. What were the limitations that Procedural Programming could not accomplish? and Does procedural language still hold some value in the field of programming? If yes, What are they, and What are there advantages over OOP?

    Read the article

  • Linux Kernel wait_for_completion_timeout not wakeup by complete

    - by Jun Li
    I am working on a strange issue with the i2c-omap driver. I am not sure if the problem happens at other time or not, but it happens around 5% of the time I tried to power off the system. During system power off, I write to some registers in the PMIC via I2C. In i2c-omap.c, I can see that the calling thread is waiting on wait_for_completion_timeout with a timeout value set to 1 second. And I can see the IRQ called "complete" (I added printk AFTER "complete"). However, after "complete" gets called, the wait_for_completion_timeout did not return. Instead, it takes up to 5 MINUTES before it returns. And the return value of wait_for_completion_timeout is positive indicating that there is no timeout. And the whole I2C transaction was successful. In the meantime, I can see printk messages from other drivers. And the serial console still works. It is on Android, and if I use "top" I can see system_server is taking about 95% of the CPU. Killing system_server can make the wait_for_completion_timeout return immediately. So my question is what could a user space app (system_server) do to make a kernel "wait_for_completion_timeout" not being wake up? Thanks!

    Read the article

  • OSX / Kernel extensions: problem locating a driver (that extends IOSCSIPeripheralDeviceType00)

    - by LG
    Hi, I'm implementing a driver that extends IOSCSIPeripheralDeviceType00 as I need to send custom SCSI commands to a device. I'm following the VendorSpecificType00 and SimpleUserClient examples and http://wagerlabs.com/writing-a-mac-osx-usb-device-driver-that-impl as an example. I built my kernel extension and it loads fine with kextload and it shows up in kextstat. The problem is that I can't locate it in my user space code. Here's the important (I think) part of: my driver code: #define super IOSCSIPeripheralDeviceType00 OSDefineMetaClassAndStructors(com_mycompany_driver_Foo, IOSCSIPeripheralDeviceType00) my user client code: #define super IOUserClient OSDefineMetaClassAndStructors(com_mycompany_driver_FooUserClient, IOUserClient) the plist: CFBundleIdentifier -> com.mycompany.driver.Foo IOCLass -> com_mycompany_driver_Foo IOUserClientClass -> com_mycompany_driver_FooUserClient IOProviderClass -> IOSCSIPeripheralDeviceNub Here's how I try to locate the driver in my user space code (similar to SimpleUserClient): dictRef = IOServiceMatching("com_mycompany_driver_Foo"); kernResult = IOServiceGetMatchingServices(kIOMasterPortDefault, dictRef, &iterator); When I execute the code, iterator is 0. I noticed that in the VendorSpecificType00 code, the localization of the driver is done differently: dictRef = IOServiceMatching("IOBlockStorageServices"); kr = IOServiceGetMatchingServices(kIOMasterPortDefault, dictRef, &iter); while ((service = IOIteratorNext(iter))) { io_registry_entry_t parent; kr = IORegistryEntryGetParentEntry(service, kIOServicePlane, &parent); ... // We're only interested in the parent object if it's our driver class. if (IOObjectConformsTo(parent, "com_apple_dts_driver_VendorSpecificType00")) { I tried doing that but it didn't work either. Thanks for reading and your help, -L

    Read the article

  • Get_user running at kernel mode returns error

    - by Fangkai Yang
    Hi, all, I have a problem with get_user() macro. What I did is as follows: I run the following program int main() { int a = 20; printf("address of a: %p", &a); sleep(200); return 0; } When the program runs, it outputs the address of a, say, 0xbff91914. Then I pass this address to a module running in Kernel Mode that retrieves the contents at this address (at the time when I did this, I also made sure the process didn't terminate, because I put it to sleep for 200 seconds... ): The address is firstly sent as a string, and I cast them into pointer type. int * ptr = (int*)simple_strtol(buffer, NULL,16); printk("address: %p",ptr); // I use this line to make sure the cast is correct. When running, it outputs bff91914, as expected. int val = 0; int res; res= get_user(val, (int*) ptr); However, res is always not 0, meaning that get_user returns error. I am wondering what is the problem.... Thank you!! -- Fangkai

    Read the article

  • explain notifier.c from the Linux kernel

    - by apollon
    I'm seeking to fully understand the following code snippet from kernel/notifier.c. I have read and built simple link lists and think I get the construct from K&R's C programming. The second line below which begins with the 'int' appears to be two items together which is unclear. The first is the (*notifier_call) which I believe has independent but related significance with the second containing a 'notifier block' term. Can you explain how it works in detail? I understand that there is a function pointer and multiple subscribers possible. But I lack the way to tie these facts together, and could use a primer or key so I exactly understand how the code works. The third line looks to contain the linking structure, or recursive nature. Forgive my terms, and correct them as fit as I am a new student of computer science terminology. struct notifier_block { int (*notifier_call)(struct notifier_block *, unsigned long, void *); struct notifier_block *next; int priority; };

    Read the article

  • Checking out systems programming, what should I learn, using what resources?

    - by Anto
    I have done some hobby application development, but now I'm interested in checking out systems programming (mainly operating systems, Linux kernel etc.). I know low-level languages like C, and I know minimal amounts of x86 Assembly (should I improve on it?). What resources/books/websites/projects etc. do you recommend for one to get started with systems programming and what topics are important? Note that I know close to nothing about the subject, so whatever resources you suggest should be introductory resources. I still know what the subject is and what it includes etc., but I have not done systems programming before (but some application development, as previously noted, and I'm familiar with a bunch of programming languages as well as software engineering in general and algorithms, data structures etc.).

    Read the article

  • How to obtain flow while pair programming in agile development?

    - by bizso09
    Flow is is concept introduced by Mihaly Csikszentmihalyi In short, it means what most to get into the "zone". You feel immeresed in the task you are doing, you are in deep focus and concentration and the task difficulty is just right for you, but challenging at the same time. When people acquire flow their prodctivity shoots up. Programming requires great deal of mental focus and programmers need to juggle several things in their mind at once. Many like to work in a quite environment where they can direct their full attention to the task. If they are interreupted, it may take several minutes, sometimes hours to get back into flow. I understand that agile way of doing software development is called pair prograaming. This is pormoted in Extreme programming too. It means you put the whole software development team in one room so that communication is seamless. You do programming with your pair because this way you get instant code reviews and fix bugs sooner. However, I alwys had problem obtaining flow while doing pair programming because of the contant stream of interrupts. I'm thinking deep about an issue then all of sudden someone asks me a question from another pair. My train of thought is all lost. How can you obtain and keep flow while doing agile pair programming?

    Read the article

  • Are there any books that teach techniques for effective pair programming?

    - by Paul D. Waite
    I’ve just read the pair programming chapter of ‘Making Software’ by Andy Oram, and I’d like to try it when I next get an opportunity. The chapter mentions that in one of the studies, the subjects were initially given instruction on effective pair programming. Are there any books (or chapters of books) that I could read to get a good grounding in how to do pair programming effectively, so that I’m more prepared?

    Read the article

  • Donald Ferguson says end-user programming is next big thing. Is it?

    - by Joris Meys
    You can guess how I came to ask this question... Anyway : http://www.bbc.co.uk/news/business-11944966 Donald Ferguson claiming that his websphere was his biggest disaster and proclaiming that end-user programming will be the way forward. This genuinely spurs the question : what with current programming languages. Honestly, I don't think that end-user programming will go much beyond a rather rigid template where you can build some apps around. If you see how many people actually manage to understand the basic functionality of functions in EXCEL... Plus, I fail to see how complex and performant systems can be built in such an end-user programming language ( Visual Basic, anyone?) Nice to play around with, but for many applications they're just not the thing. So no worries for the old languages if you ask me. What's your ideas?

    Read the article

  • As a programmer, should I know low and high-level programming languages?

    - by job
    I been contacted to do some work remote controlling LEDs displays over TCP/IP, but my experience and preparation is mostly about high-level programming language. I said that to the person who contact me about the work and he told me that: "if you call yourself a programmer you should know all these things" Should a programmer really know the details of low-level programming? Or can I treat it as a black box concept, as theoretical knowledge but not necessarily doing it or implementing low level language solutions, having in mind that low-level programming is not my expertise?

    Read the article

  • Is the slow performance of programming languages a bad thing?

    - by Emanuil
    Here's how I see it. There's machine code and it's all that the computers needs in order to run something. The computers don't care about programming languages. It doesn't matter to them if the machine code comes from Perl, Python or PHP. Programming languages exist to serve programmers. Some programming languages run slower than others but that's not necessarily because there is something wrong with them. In many cases it's just because they do more things that otherwise programmers would have to do and by doing these things, they do better what they are supposed to do - serve programmers. So is the slower performance (at runtime) of a programming language really a bad thing?

    Read the article

  • How to learn programming for a medium scale project form a beginner? [closed]

    - by Lin Xiangyu
    I study programming by myself.I have learn servel programming languages. but I never write a project more than 1000 lines. I know the best way to improve programming skills is practise. The problem is many books, just talk about the programming language, or talk about build a project from a high level. Fews of books will teach how to build a middle scale project. For example, I want to build a simple HTTP Server(Nor like Apache or just a simple listenr to a port), a Markdown Parser, or a download tools just like emule or wget. I don't know what to do. I may found peaces of code in the web, or found familiar project in the Github. I don't know how to read the code. I want to some tutorial that can told me how to build the project step by step, teacher me how to write thousands lines of code. Any suggest?

    Read the article

  • What syntax element do you hate most in a programming language you use frequently?

    - by Timwi
    No matter how much you love a programming language, there are always a few details in it that aren’t quite as nice as they could be. In this question, I would like to specifically focus on syntax elements. In a programming language that you use frequently (perhaps your favourite programming language, or perhaps the one you are forced to use at work), which syntax element do you find most unreadable, unclear, inconvenient or unpleasant?

    Read the article

  • What triggered the popularity of lambda functions in modern programming languages?

    - by Giorgio
    In the last few years anonymous functions (AKA lambda functions) have become a very popular language construct and almost every major / mainstream programming language has introduced them or is planned to introduce them in an upcoming revision of the standard. Yet, anonymous functions are a very old and very well-known concept in Mathematics and Computer Science (invented by the mathematician Alonzo Church around 1936, and used by the Lisp programming language since 1958, see e.g. here). So why didn't today's mainstream programming languages (many of which originated 15 to 20 years ago) support lambda functions from the very beginning and only introduced them later? And what triggered the massive adoption of anonymous functions in the last few years? Is there some specific event, new requirement or programming technique that started this phenomenon?

    Read the article

  • How a graphic designer can get into game programming?

    - by Robert Valdez
    I'm a graphic design student hoping to pursue a career as a video game artist. However, I want to do some game development as a hobby. I'd like to develop games for the desktop or mobile phones. The only programming experience I have is that I took an intro to programming with java class in which I learned how to make web applets using java's swing library. It was awful. I think the only things I took from the class was what OOP is and how to work with variables and data types and some methods. I also learned some actionscript myself which was fun unfortunately my flash tutorial expired and it's too expensive to buy;( What I was looking to do is learn one programming language and build a game with it without having to go through so many hoops and with minimum cost. If it's possible. I would love to learn C++, but I read it's not best for a beginning programmer. What programming languages or maybe software kits/platforms would you recommend?

    Read the article

  • Is slower performance, of programming languages, really, a bad thing?

    - by Emanuil
    Here's how I see it. There's machine code and it's all that computers needs in order to run something. Computers don't care about programming languages. It doesn't matter to them whether the machine code comes from Perl, Python or PHP. Programming languages don't serve computers. They serve programmers. Some programming languages run slower than others but that's not necessarily because there is something wrong with them. In many cases, it's because they do more things that programmers would otherwise have to do (i.e. memory management) and by doing these things, they are better in what they are supposed to do - serve programmers. So, is slower performance, of programming languages, really, a bad thing?

    Read the article

  • How can you achieve and maintain flow while pair programming?

    - by bizso09
    Flow is a concept introduced by Mihaly Csikszentmihalyi; in short, it means to get into the "zone". You feel immersed in your task, focused; the task can be difficult but challenging at the same time. When people achieve flow their productivity shoots up. Programming requires a great deal of mental focus because we often need to juggle several things in our minds at once. Many like to work in a quiet environment where they can direct their full attention to the task. If they are interrupted, it may take several minutes or even hours to get back into flow. I understand there's a practice in agile development and extreme programming called pair programming. It means you put the whole software development team in one room so that communication is seamless. You do write code with your pair because this way you get instant code reviews and fewer bugs get through. I've always had problems achieving flow while doing pair programming because of constant interruptions. I'm thinking deep about an issue then all of sudden someone asks me a question from another pair. My train of thought is lost. How can you achieve and maintain flow while pair programming?

    Read the article

  • How do you get a high paying job programming in finance?

    - by q303
    Hi, I'm interested in eventually programming for a financial company. Unfortunately, I have a degree in linguistics with a minor in CS along with 4 years experience in .NET. I picked .NET because I thought that it would be more used in the financial world. I've heard some horror stories about badly done VBA Excel programming and being way underpaid...but then I've heard great stories about highly skilled C++ programming along with high pay (including some feedback to previous questions). I just get the impression that unless you have a MS in CS from a top 10/20 school, it might not be realistic. For those of you doing programming for bankers/traders, how did you break in?

    Read the article

  • How can be data oriented programming applied for GUI system?

    - by Miro
    I've just learned basics of Data oriented programming design, but I'm not very familiar with that yet. I've also read Pitfalls of Object Oriented Programming GCAP 09. It seems that data oriented programming is much better idea for games, than OOP. I'm just creating my own GUI system and it's completely OOP. I'm thinking if is data oriented programming design applicable for structured things like GUI. The main problem I see is that every type widget has different data, so I can hardly group them into arrays. Also every type of widget renders differently so I still need to call virtual functions.

    Read the article

  • Why are slower programming languages considered worse than faster ones?

    - by Emanuil
    Here's how I see it. There's machine code and it's all that the computers needs in order to run something. The computers don't care about programming languages. It doesn't matter to them if the machine code comes from Perl, Python or PHP. Programming languages exist to serve programmers. Some programming languages run slower then others but that's not because there is something wrong with them. It's often because they do more things that otherwise programmers would do and by doing these things, they do better what they are supposed to do - serve programmers. So why are slower programming languages considered worse than faster ones?

    Read the article

  • What syntax element do you hate most in a programming language you use frequently? [closed]

    - by Timwi
    No matter how much you love a programming language, there are always a few details in it that aren’t quite as nice as they could be. In this question, I would like to specifically focus on syntax elements. In a programming language that you use frequently (perhaps your favourite programming language, or perhaps the one you are forced to use at work), which syntax element do you find most unreadable, unclear, inconvenient or unpleasant?

    Read the article

< Previous Page | 27 28 29 30 31 32 33 34 35 36 37 38  | Next Page >