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).
I am new to Linux Kernel. I want to disable branch prediction in kernel and recompile for my research purpose. Can anyone point me to clear instructions on where i can find the kernel config file in ubuntu and steps to recompile the updated kernel
I`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�
Bottom line first: Is there a GUI or otherwise friendly tool to modify the kernel parameters? One that will give help on a highlighted parameters?
Now as to my reason for this question:
In preparing for an Informix installation, I may need to change some kernel parameters. I could follow the advice of G�rard BIGOT from a couple of years ago at this URL. However, messing with the kernel this way, by directly editing /etc/sysctl.conf, is a bit scary. I have already backed up the current one and started editing according the Informix machine notes. However, I have commented out my new settings. [:Chicken]
The scariest aspect of this is that the notes recommend settings to kernel parameters that I do not find in /proc/sys/kernel. for example, it recommends setting SHMMIN to 1 but when I can /proc/sys.kernel/shmmin, there is no such file. (I did find shmmax.) Similarly for the very logical shmseg (max number of shared memory segments) - not found. I am afraid to add these into sysctl.conf if the equivalent pseudo-files don't exist.
Additional question: Where [on-line] do I find all kernel parameters documented? This is so that I am more certain of what I am doing instead of relying on my memory. For example, I don't recall the names of the parameters that control Kernel-Asynchronous I/O (KAIO) events.
I'd like to create a custom squeeze kernel. Is it a really bad idea to edit to edit the kernel config file directly instead of using "make config", "make menuconfig" or "make gconfig"? My problem is I missing a search function, for example in "make menuconfig" and cannot find some entries.
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.
I want to start to play with "homemade" kernels. (To get some experiences in this subject). I want to do this step-by-step. I have already read a lot about this. I have a Fedora 10 running. So I want to start with this. I have read that there is a "special" way to create a kernel for Fedora. [URL] OK. I understand this +/-. When you build a new kernel with an other version number, you have to rebuild all the modules with this new kernelversion, and you have to install these also.
But : I want to start with modify only some parameters in my kernel config. Do I need to rebuild and re-install the modules also? Will it not be enough to rebuild only the kernel? (vmlinuz) Where can I find some information about the options I can disable in my kernel to speedup my system? (boot process ed). I want to suppress the loading of unneeded modules. I want to understand the options in menuconfig (and there are a lot of options ! ! )
My Slackware boots using the huge kernel. I am not using LILO; I am using GRUB from the extras directory on the DVD. I followed the tutorial @ [URL] up to the point where it discusses modifying LILO. My /boot/grub/menu.lst reads, in part:
# Linux bootable partition config begins title Slackware Linux on (/dev/sda7) root (hd0,6) kernel /boot/vmlinuz root=/dev/sda7 ro vga=normal # Linux bootable partition config ends
This boots the huge kernel. What changes must I make to the above menu.lst entry to boot using the generic kernel?
Now we are implementing our own shell using C++. What upseting us is the history command function, we use an array to store the history commands, and print the when receiving the up and down arrow buttons. The problem is we cannot modify the history command already printed on the terminal, we even cannot move the cursur, let alone modifying the command.
Okay so I'm working on a program here as I'm learning java,I have an array that is initialized with 5 objects that are hard coded. I have made a GUI that takes the input needed and creates an object with those values.I need to add that object to the ArrayList that I have previously made.Okay, so I have three classes, guiclass.java, main.java and gladiator.java Objects are made and defined in "gladiator".Main contains my public static void main section, launches my gui, creates my five hard coded objects, creates my ArrayList and adds my five hard coded objects to the ArrayList.Now, I need to add the object that I generated in the guiSection [action Listener]to the ArrayList that I created in my main class's public static void main string... section. Problem is my arraylist "cannot be resolved" from guiclass.
I have a CDL netlist with 5630 lines. 512 of the lines are over 128 characters. The tool I am using to read in the CDL returns an error for each line over 128 characters.
If the line is too long I can fix it by adding a line continuation symbol, in this case a "/", somewhere prior to the 128th character then a line feed, obviously, and a "+" to the continuation.
example (pretend its a long line); before; this line is too long after; this line / + is too long
Part of the problem is that I can't use a constant point prior to the 128th character because I can't break up a term.
bad; this line i / + s too long
If I can replace the last space before the 128th character with " / + " on all lines that are over 128 characters then I'm golden. I'm not sure if I need to escape the + or not. If so then the substitution is " / + ". And if I use sed then I'll escape the .
I'm trying to modify the code for gblink so that it can read from my usb to parallel port cable. I know that the address for a normal parallel port (/dev/lp0) is 0x3bc, but how can I find out the address for /dev/usb/lp0?
The output of a command changed and I need to extract the data and print it out in a different fassion:
Code: abcd1=aaaa xx abcd 2 aaa xx bbb abcd2=aaaa xy ab 2 xx aaa bbb ccc xxx should be transformed to:
[Code]...
Currently I used sed "search1|search2|search3" to get the lines that need to be transformed. But I also need to search for substrings in those lines and I need to print those substrings in a specific order together with other characters. How is this done with sed?
i have just modify tcp.c file in/usr/src/linux/net/ ipv4 location.Now should i compile the complete kernel?if not then how to compile that net/ipv4 package or etc.
I'm running RHEL5.5 and nagios 3.2.0. The real question deals with how to change the printed output so nagios will work with it.I have made a script that will calculate network throughput on interfaces. The script is going through and finding all interfaces (eth, bond, lan) and doing the math to calculate throughput.The output is mainly for nagios to report and trend the values. As nagios wants to see nothing but perf data after the '|' character, I somehow need to have only one '|' character for all of the output.
I have around 600 empty text files that I need to add the name of this file as part of the data, I mean files from "file1.txt to "file599.txt, all of them empty, and I need to get the name inside the file, so, when I open the file show the name as part of the data "file1".
I have developed an application, in C language, that should received the EPOCH time (6 bytes) at about every 30 min. What function should I use as a non root user to modify the System Time.? The idea is that the same application could update the System Time. I am using Ubuntu.
I don't think this is a "perl one-liner" of find and replace. I'm trying to auto-fill some information in a listing of files. The simplest example is that in the files the following exists:
I would want the script to find this and populate it with something like -- Date : 20101004-1758
I have a few more similar fields to autofill, and I'd like to do this from within a larger perl script I'm developing to process these files. So, how I perform in-place file modification from within a perl script?
There is a file with that format of each models' information.I don't think that's good format, but I cannot change that format. I needed to modify the model name, 'model = xxx' as 'model = abc'.And I don't know how to parse and modify 'model = iii' and 'model = ddd'.The only clue to parse 'model = ddd' is the second 'model = ' after the second 'system information'. But how to parse the second keyword?Is it possible with 'sed'?I sometimes have to modify the information of the file.using shell script if possible.Python is ok. (Shell script is better for me.)
So far so good. Now, I want to define two variables (e.g. e1,e2) in the bash file, so that their values would correspond to 00.00 and 30.00, as read from the input file. This one I have not found yet, thus asking for your advice. At the end, writing echo $e1 $e2, I should get 10.00 30.00 This is even harder to me: I want to replace the values emin,emax in a new file "modify.dat" which looks like that:
with the values e1 and e2 I have in my bash file. In other words, I want to call "modify.dat", find these two lines and replace the numeric values with the e1 and e2. At the end, my file should be like:
As awk programmers may know, we can print range of lines with awk, from an initial pattern until a final pattern as follow:
Code:
awk '/Initial_String/,/Final_String/' inputfile
Well, I have this inputfile:
Code:
[code]...
Once having those elements in that way within an array(a[]), I want to be able to manipulate the array (a[]) and copy its elements to another array (b[]) in different order (all lines joined in a single line separated with commas), as follow:
I write the network driver. Transmission of packets in user space I do through netlink socket`s. In user space there is a handling of packets and their transmission on other device (however, it isn't important).
Problem in that any time, packets through the driver in system, and is reverse, are transferred normally. But then there comes the moment when the kernel crash. If to look in syslog it seems to me that comes deadlock. Also I think that it is related with netlink socket`s.
I can't find the information on that anywhere how correctly to use netlink socket`s in kernel space. Can at you will any a reason into the account of synchronization of sockets and the driver in kernel space?
How do I add/delete modify the menu system on the Fedora Menu Bar, i.e. If I want to add a custom menu to the "Applications/Office" menu how do I do it?
Fedora Core 14 On Gnome 2.32.0 (Linux xxxxx 2.6.35.6-45.fc14.i686 #1 SMP Mon Oct 18 23:56:17 UTC 2010 i686 i686 i386 GNU/Linux)
Which command should I use programmatically (in ldap.h) to change only ONE of the attributes above? say i only want to change the userPassword from value secret -> notasecret
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.
