problem about kernel-programming-Collection of common programming errors
Kernel Programmer
c linux linux-kernel embedded-linux kernel-programming
I have:A C program main.c with the main function that has the function call. Another C program test.c with function definitions. A header test.h has the common declarations.Pls read Carefully my objective my objective is to have a kernel object and a appliction that uses it. and i need to give some inputs to the function at runtime and process with that.i’m using it in terminal. Can anyone please help me out?
Orcris
ApprenticeHacker
c++ operating-system kernel kernel-programming
From what I know, even though the common OS have parts written in other languages, the kernel is entirely written in C.I want to know if it’s feasible to write a Kernel in C++ and if not, what would be the drawbacks.
Anders Abel
c visual-c++ driver kernel-programming winddk
I am writing a windows kernel mode driver in which I will have to manipulate lots of strings. Everywhere it has been advised to use “Safe String” functions instead of normal C functions. However, many of the string functions haven’t been implemented e.g. strchr, strstr.My question is whether there are any functions which I can use to search for strings within strings in kernel mode?
pmjordan
osx terminal kernel-programming iokit
Now i am developing my own driver.I develop in i/o kitDriver template.I build my code it is executed successfully but the problem in terminal. I developed the code in below manner in header file #include <IOKit/IOService.h>class com_osxkernel_driver_IOKIT : public IOService {OSDeclareDefaultStructors(com_osxkernel_driver_IOKIT) public:virtual bool init (OSDictionary* dictionary = NULL);virtual void free (void);virtual IOService* probe (IOService* provider, SInt32* score);virtual
ThiefMaster
c windows driver kernel-programming bsod
One of the drivers I’m developing has caused a BSOD. Unfortunately a dump file was not created since it was not configured / low resources. I was trying to reproduce this crash but no luck so far.Is there any way to get some info using WinDbg or any other tool? I have this information:A screenshot of the BSOD The .sys file. Its pdb The source code The machine it was crashed onI have everything except the dump itself.Your help will be much appreciated.As I said above, no dump (/minidump) exists.
Alex
android linux-kernel kernel-programming
I’M writing some stuff in the wonderful world of system libraries, and I’m getting crashes in libc, which my library is apparently passing bad values. Is there any way that I can have Android generate a core dump for the crashing application so I can decompose the application stack? Im particular, I’m causing system_server to crash, if that helps. EDIT: The gist of my problem is this: When the application crashes within a library like libc, then the tombstone that gets output shows a stack trace
WedaPashi
linux linux-kernel linux-device-driver kernel-programming
I was trying to read a loopback device that I have created through a kernel module in periods of 200ms, but it is crashing the kernel, when I try to insert it.I think there is problem with my read module, but it works fine without timer.I am new to kernel programming,please help. Thank you in advance:D #include <linux/kernel.h> #include <linux/module.h> #include <linux/timer.h> #include<linux/fs.h> #include <linux/init.h> #include <asm/segment.h> #include <
user872661
windbg kernel-programming
My driver have crashed in the target pc with the error:Access violation – code c0000005 (!!! second chance !!!) aebae9d9 8911 mov dword ptr [ecx],edxSince I’m debugging in kernel mode my target is now freezed. If I restarting WinDbg at the host I still end up with the target freezed.How do I force a kill (from WinDbg) of my hung driver in the target machine. I know about .crash but it would be nice not to have to restart the computer, zzz…
ray pixar
c open-source device-driver kernel-programming
Are there any open source C Library (not c++) for Windows Driver Development ?I am developing a network device driver that need some functionality such as RegEx, string manipulation, Object Oriented by C and XML and so on…thanks.
Prathamesh Raut
visual-c++ visual-studio-2012 kernel-programming filter-driver
I am trying to save certain data like some bitmap by using the structure astypedef struct _BITMAPDATA {CHAR* bitmapData;ULONG bitmapSize; }BITMAPDATA,*PBITMAPDATA;I have created these bitmap through filter driver, bitmaps is working fine but,how can i store that bitmap in an persistent storage like hard disk. So that whenever system gets crashed or shutdown accidently, driver must store all the bitmaps created in an persistent storage and when system restart, it will reload them.
Kernel Programmer
linux-kernel kernel-programming kernel-module
http://www.makelinux.net/ldd3/chp-2-sect-3#chp-2-ITERM-4135 this link describes the user space and kernel space communication. could anyone explain it with a simple user space application program in c that links & communicates(send / receives values) to the kernel object.?
Jubba
c++ windows memory-management driver kernel-programming
I have a program that allocates a buffer whose pointer is passed to a kernel driver through a custom IOCTL. In the driver I get an Mdl and lock the pages of the user-program buffer with “MmGetSystemAddressForMdlSafe” and then use the Mdl to fill the user program buffer.If in the user program the buffer was a normal array, the driver always works as it should. (WORD buffer[256], where word is an unsigned short)If the user program buffer was instead allocated with the new keyword (WORD *buffer = n
San
linux-kernel kernel-programming ioctl
I am trying to implement ioctl in kernel space to write some date into the register, I am getting a crash in cmd of ioctl.Below is my code:Kernel side:static struct file_operations fops = { .compat_ioctl = device_ioctl };int device_ioctl(struct inode *inode, struct file *filep, unsigned int cmd, unsigned long arg) {int len = 200;printk (KERN_INFO “In Device_ioctl !!\n”);switch(cmd){case IOCTL_WRITE_REG:write_ioctl((unsigned long *)arg);break;default:printk (KERN_INFO “default\n”);return -ENOTTY;
Cody Gray
windows crash kernel-programming kernel-mode
I wrote a kernel driver that hooks into a process and hides a folder. This driver works very well, until I connect an external hard disk.At this point, my OS (either Windows XP or Server 2003) crashes with a blue screen of death (BSOD).What could be causing this crash, and how can I modify my driver to solve it?
Dnyanesh
c++ operating-system kernel kernel-programming
I am currently programming a kernel in c++. So as the basic part of kernel i have implemented a interrupt handling module in my kernel and it works well. But it is not working for RTC IRQ8 interrupt.This is the my code for enabling irq:void IDT::enable_irq(unsigned short x, void (*handler)(), unsigned char control){current_mask &= ~(1<<x) ; //Zero off the IRQ mask to enable if (x>=8) {current_mask &= ~(1<<2);set_int((x + SLAVE_VEC – 7),(unsigned long) handler, control);
Mathieu Devos
android network-programming linux-kernel kernel-module kernel-programming
I have quite a specific piece of code here and so far the internet has been of little help. I’m trying to write a piece of code that (for starters) should just be able to read out an 802.11 (wireless) packet and print information from the MAC header. I tried composing my code out of different tutorials, pieces of kernel information, … The program that I’m trying to write is a loadable kernel module for android (although linux kernel is very similar). While I can currently receive sk_buff packe
seba0691
c raspberry-pi kernel-programming syscall
I have been trying to write a new system call(called sys_defclose) in the raspberry’s kernel, but upon compiling i get this error:arch/arm/kernel/built-in.o: In function `__sys_trace_return’: :(.text+0xd50): undefined reference to `sys_defclose’i have modified the following file:-include/linux/syscalls.h : where i put the prototype of my syscall-arch/arm/include/asm/unistd.h : where i put the new raw of the syscall table: #define __NR_sys_defclose (__NR_SYSCALL_BASE+380)-arch/arm/kernel/call
ndasusers
c linux-device-driver kernel-programming backtrace
So I am trying to find out what kernel processes are calling some functions in a block driver. I thought including backtrace() in the C library would make it easy. But I am having trouble to load the backtrace. I copied this example function to show the backtrace:http://www.linuxjournal.com/files/linuxjournal.com/linuxjournal/articles/063/6391/6391l1.htmlAll attempts to compile have error in one place or another that a file cannot be found or that the functions are not defined. Here is what come
Scott Davies
c osx-snow-leopard kernel-programming
I am experimenting with the Mac OS X 10.6.5 kernel libraries. Specifically, I am attempting to do a very simple call to the crget() function (please see: http://fxr.watson.org/fxr/source/sys/ucred.h?v=DFBSD#L101 for function prototype).The code is only:#include <sys/param.h> #include <sys/ucred.h>// Main().int main (void) {// Return a ucred struct from kernel for this process.struct ucred *processCredentials = crget();// Rest of code…return 0; }XCode reports:Undefined symbols for
Peter Mortensen
c linux-kernel kernel kernel-programming
I am using Ubuntu 9.04 with kernel 2.8.32. I created a simple system call that counts the number of clone and execve calls. When the user/shell calls this system call, I would like it to pass back to the user these two values. As of now I am using:#include <linux/sched.h> #include <linux/asmlinkage>/* These two variables are extern longs which are defined in sched.h and initialized in process_32.c */total_execve; total_clones;long mycall* (int i){int array[2];array[0] = total_execve;
prap19
filesystems makefile kernel-programming static-linking kernel-module
i have created a kernel module that uses kernel level functions such as vfs_read, write etc. This module has a makefile that builds this module to get the .ko file. I want to analyze the objdump output of this .ko file. However I observed that kernel functions such as vfs_read and write are not resolved in the .ko file. They are just called and my guess is that they are resolved at run time. Is it possible to make some changes in the makefile and statically link all these functions in the sing
vinay
c linux-device-driver kernel-programming
I have a Module.symvers files which has the symbols (from Module A) I need to use in other module say B. But I cant make changes to the original module A. Is there a way to tell Module B, to get symbols as per the Module.symvers file. I have included it in my build directory, its still gives be undefined symbols error while compiling module A. Appreciate your help.
Neil
kernel-programming kconfig
I have the following entry in drivers/media/video/Kconfig:config VIDEO_OMAP3tristate “OMAP 3 Camera support”select VIDEOBUF_GENselect VIDEOBUF_DMA_SGselect OMAP_IOMMUdepends on VIDEO_V4L2 && ARCH_OMAP34XX—help—Driver for an OMAP 3 camera controller.When I search for VIDEO_OMAP3 in menuconfig I get:Symbol: VIDEO_OMAP3 [=n] Prompt: OMAP 3 Camera supportDefined at drivers/media/video/Kconfig:836Depends on: MEDIA_SUPPORT [=y] && VIDEO_CAPTURE_DRIVERS [=y] && VIDEO_V4L2 [=
Dew Kumar
linux-kernel linux-device-driver kernel-programming kernel-module
I have written a sample hello.ko kernel module:#include <linux/module.h> /* Needed by all modules */ #include <linux/kernel.h> /* Needed for KERN_INFO */int init_module(void) {printk(KERN_INFO “Hello world.\n”);return 0; }void cleanup_module(void) {printk(KERN_INFO “Goodbye world 1.\n”); }Here, I have used “printk” method which is a Kernel API exposed by Linux. I can see the Linux exported symbols in “/proc/kallsyms”. I am curious to know how do gcc/ld links the called Kern
Wojciech Reszelewski
c kernel-programming kernel-module
I’ ve got such a functionstatic ssize_t read_mydevice(struct file *filp, char* buf, size_t count, loff_t* ppos) {char *text = “Device is empty\n”;int len = strlen(text);if (*ppos != 0)return 0;if(count>bytesindev) count=bytesindev;if(bytesindev==0) {if (copy_to_user(buf, text, len))return -EINVAL;} else {while(count>0) {if (copy_to_user(buf++, msg_Ptr, (unsigned long) 1)) {return -EINVAL;} else {strcpy(msg_Ptr, (msg_Ptr+1));bytesindev-=1;*(msg_Ptr+bytesindev) = ‘\0’;}count-=1;printk(KERN_I
ctuffli
linux linux-kernel linux-device-driver kernel-programming kernel-module
I am porting a Linux module (PageMgrMod) to a more recent kernel, but now the functions are not visible to other modules. For example, loading a module that uses PageMgrMod gives the errorno symbol version for init_pgmgrUnknown symbol init_pgmgrBut reading /proc/kallsyms shows the symbol existsffffffff81883c0d T x86_init_pgd_noopffffffffa012a5c0 r __ksymtab_init_pgmgr [PageMgrMod]ffffffffa012a669 r __kstrtab_init_pgmgr [PageMgrMod]ffffffffa012a600 r __kcrctab_init_pgmgr [PageMgrMod]ffffffffa012a
vidzi
c linux-kernel kernel kernel-module kernel-programming
I am trying to implement a kernel module, which can access the task_struct of a user process, whose Process ID is already known to me. I am using find_get_pid and pid_task to get the task_struct of the process:#include <linux/kernel.h> #include <linux/module.h> #include <linux/sched.h> #include <linux/pid.h> #include <linux/pid_namespace.h>int init_module( void ) { //Declaring the variablesint p_id = 6980; //6980 is the process ID of my user processstruct pid *pi
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