I want to test my system call that be goint to add to kernel, But when i finish compiling kernel, i found my system call code not work. the code i want to return the system time "struct timespec":
/*----------Start of mycall.c----------*/
#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/kernel.h>
[code]....
so i want a method to test the new system call before compiling kernel.
Does anyone have straightforward simple example document for adding a system call on fedora 14 kernel?
View 12 Replies View RelatedI`m trying to compile sources of kernel module which has been written for kernel 2.6.9. There were many changes in kernel headers since then in current kernel sources. I`ve found that old /asm/system.h was moved under architecture dedicated directory /arch/*/include/asm/system.h. Anyway during sources compilation I`m having errors related to kernel sources. It looks like there is something wrong with this /asm/system.h
Code:
../asm/system.h: In function �__cmpxchg�:
../asm/system.h:248: error: expected string literal before �LOCK_PREFIX�
../asm/system.h:254: error: expected string literal before �LOCK_PREFIX�
[code]....
I have logged into one Linux VM and I want to test remote access to another Linux server on the same network but I cannot recall the Linux application to call?
View 10 Replies View RelatedMy ubuntu version is 9.10
I was working on adding a call system to my linux kernel.
I tried a lot of threads and .pdf files which explaining how to add a system call. Like :
1- This thread
2- .pdf file
and many ..
I tried working with linux-2.6.18.1 , 2.6.33.1 , 2.6.28.1 and many many.
But , all of them are returning -1 as result ..
I prefer working on 2.6.28 kernel version or above like 2.6.33.1
i want to add a new system call.im following this guide [URL] in this step 6 he said add __NR_mycall to some number, in unistd.h. in include/asm/unistd.h there are are around 1079 calls for different hardwares. and the __NR_SYSCALLS is also defined many places. I don't know where to add my new system call. and another qn is. whether the number for syscall in unistd.h and arch/x86/syscall_32.s both should be same?or they can be different.
View 2 Replies View RelatedI have been assigned to implement a system call that report the system statistics over all memory which are
Total Pages in Active LRU list
Total Pages in Inactive LRU List
in below program why was new_args[0], rather than the reference the_cmd, passed to the execvp system call?
Code:
/*
A _very_ limited shell program
[code]....
I have a process that forks, where the childs puts some data of random size and exits while the parent should get the data and does some manipulation.. here I have used a pipe for child to write the data and parent to read the data.. Child simply dumps the data, and the data is of any size even child and parent doesnt know.
I have used select in the parent to see whether there is any data coming on the reading end of the pipe.. if there is a data.. I copy into a buffer.. Im reading the data continusly when the child exits after closing the writing end of pipe. Parent gets blocked on the read part But my question is how parent know the other of pipe is closed when using the select call. In otherwords.. while using select in readfds, how would i know the other end has closed the pipe..
I am trying to figure out how i would go about finding out where system call is made and error checking is not done. I have code below, if somebody can point me in the right direction where system call is made but error checking is not done.Quote:
#include "shell.h"
#include <stdio.h>
#include <string.h>
[code]....
I successfully added a new system call in CentOS Kernel but I don't know where to view it! My kernel version is -2.6.32.5
View 2 Replies View Relatedhow to create a new system call Linux? what is the process of creating ?my project is to create a system call for displaying owner of a file..where exactly we have to write the system call code? and where are the places need to change ?
View 5 Replies View RelatedI have just started learning Device driver programming in Linux and am stuck in my first program. Its just to see init_module and cleanup_module calls to use printk and see results using dmesg. program is:
Code:
#define MODULE
#include<linux/module.h>
int init_module(void)
[code].....
I want to learning and developing the kernel on the practice(not kernel module). What are some ways to boot the test kernel on the same system(with stable kernel) where I`m building a test kernel for debugging purposes.
How to configure and use the host to boot a test kernel then I can boot the system(with stable kernel) and fix the test kernel.
Anyone know the reason why a sleep( ) on a Redhat Linux OS would cause the system to indefinitely hang? It's doing this every 10 or so calls in my program and I have to press the reboot button on my computer. My program is reading from a UDP port that has messages sent to it 20 times per second. When I sleep I assume the internal UDP buffer is getting more and more filled.
View 14 Replies View RelatedI just finished building a cross-compiler for i386-elf. But when I try to use it, the terminal gives me this error:
Code: Select all/home/isaac/Cross-compiler/lib/gcc/i386-elf/4.8.2/../../../../i386-elf/bin/ld: cannot find crt0.o: No such file or directory
/home/isaac/Cross-compiler/lib/gcc/i386-elf/4.8.2/../../../../i386-elf/bin/ld: cannot find -lc
collect2: error: ld returned 1 exit status
I'm trying to compile a Linux kernel module called hello-2.c using the command "make -C /lib/modules/$(uname -r)/build M=${PWD} modules" (without the quotes) (which I found online), and the following is the (seemingly successful) output.:
Code: Select allmake: Entering directory `/usr/src/linux-headers-3.2.0-4-amd64'
Building modules, stage 2.
MODPOST 0 modules
make: Leaving directory `/usr/src/linux-headers-3.2.0-4-amd64'
However, I don't see a hello-2.ko (in the same folder or anywhere else for that matter). I'm Using Debian GNU/Linux 7.6.
Everything I am doing is within a folder/directory called "thefolder" (without the quotes) in the "/tmp" directory (without the quotes).
Why I can't see a hello-2.ko, and what to do to get it?
i've written small tool in C which makes measurements on my router (OpenWrt White Russian).
It is working as a deamon. If the tool is started manually, everything works fine. If it is started per script on startup, the following system call doesn't work :
Code: sprintf(command,"/bin/cat /root/%s%s | /usr/bin/ssh -p2222 user(at)host -i /root/.ssh/id_rsa "/bin/cat >> result/%s%s"", apmac, source, apmac, dest);
rc = system (command); the returned rc in this case is 256.
first i thought it is a problems with the user rights for the tool, so i have added +s to it. but that didn't help. as i said, when the daemon is started by hand, the system call works fine.
I am making a library, but I am facing a strange problem while sending data over network using ethernet.
I am sending 39 bytes of the data from one server to slave application but some time slave receives 39 bytes and some time it receives 29 bytes. And when ever slave receives 29 bytes all the memories to which my pointers are pointing get changed. This problem is only when I am sending data from the server to slave, while sending data from slave to server I am facing no such issue.
I have a script for dd command and i am using it in an application using system() call. Now i want to have the output of the script file (i.e output of dd command) in the application file itself.
View 1 Replies View RelatedIn practice I have a script that call a java program that call a linux system command. The script if I run it, from a shell functions well,so it is not a java problem. The problem come out when i put this script in a crontab schedulation. The result in this case is that java do not execute the system command. I think it depends on crontab
View 4 Replies View Relatedwe have a multi threaded program on Linux where one thread is waiting on poll() system call with event set to POLLIN, & another thread has closed the same socket fd (which is passed to poll) , but the poll() did not return, is this the expected behavior? From man page of poll we found that the poll should return POLLNVAL if the socket fd is closed, is my understanding correct or is there any bug in the poll()?In Solaris we observed that the poll system call is returning with POLLNVAL if the socket is closed.
View 3 Replies View RelatedI have the following code:
Code:
#include <stdio.h>
#include <stdlib.h>
int main() {
system("ps -ef | grep myprocessname");
return 0; }
When I run this program it outputs the following list of running processes:
Code:
root 10279 10275 0 13:02 ? 00:00:00 myprocessname myvar1=value1 myvar2=value2
root 10341 10337 1 13:02 ? 00:00:00 myprocessname myvar1=value1 myvar2=value2
What I want to really do is instead of writing the output to screen I want to read the output and parse the various values value1, value2 etc. What is the best way to do this?
How to use execv from kernel space to call a user space program writtenfor socket prog.
I tried to write code for socket in kernel but its not working.
Socket code in kernel is also needed.
Ever sense i updated to 10.4 skype's video calling for me has turned a light shade of blue, nothing that really tampers with my call, just annoying the snot out of me because the person im talking to is blue.
Also I do not think its my cameras drivers because not only am I a shade of blue, but the person I am talking to is also blue and they say that I on their screen look fine. When i run a camera test with skype everything is a shade of blue as well.
I cannot for the life of me find a way to test my camera outside of skype.
i'm using this guide videos - howto: debian linux kernel compilation, part 1 and the author says i need kernel 2.6.26 this version of kernel doesnt longer exist in kernel.org website and the only 2.6.26 i found is a patch here. should i use the patch? or download another version of kernel?
View 2 Replies View Relatedcurl: try 'curl --help' or 'curl --manual' for more information so here curl is working when I'm trying php test.php I got: PHP Fatal error: Call to undefined function: curl_init() in /root/test.php on line 142
Also in php.ini is missing extension=php_curl.dll but I added and the same problem
I'm using gmake (v3.81) to build some c executables. As the first step in the process I run the files through a preprocessor (for embedded SQL). The preprocessor completes successfully, but the gmake reports an error and discontinues buiding the remaining dependencies...
make *** [myfile.c] Error 4
which (according to /usr/include/asm-generic/errno-base.h) means "interrupted System Call". My preprocessor doesn't raise any signals, so I'm not sure what's causing this error.
For my work, I have to modify the routing lookup process at Linux kernel.
The details is below:
A-----B.
We have pcA, pcB (using Linux OS kernel 2.6.26.5) connect together. We need to modify the source code of kernel at B in order to if A sends the packets with destination IP address as C, pcB still receives this packet and send to transport layer (that means, it bypass the routing lookup process at kernel).
The solution I used as the following code...
I have a kernel function device_ioctl(). How do I define it in file_operations?
1. struct file_operations memory_fops = {
ioctl:device_ioctl
};
2. struct file_operations memory_fops = {
.ioctl=device_ioctl
};
3. struct file_operations memory_fops = {
device_ioctl
};
which one is the right one?