I am trying to access a generic netlink family to send messages from user-space to the kernel. I am using libnl example here [URL].. The problem is that I keep getting
Code:
error: netlink/genl/genl.h: No such file or directory
error: netlink/genl/ctrl.h: No such file or directory
You would think I have not installed libnl and libnl-devel but I have.
[Code]...
i'am tring to use generic netlink and can't find function for blocking not busy waiting receive. I'll try to explain myself. Generic netlink receive mechanism based on callback function - when module receives something,this function invoked. But this is not so good if you need to send something and receive answer. I mean something like that :
sendmsg(); if(recvmsg() < 0) goto err; I need generic netlink recv() function, or some mechanism to implement it. I just want to stay in "recvmsg()" function until i have answer(until call_back function invoked).
Is there an interface whereby a userspace program can retrieve the raw keycodes/scancodes from a keyboard? I'm trying to make something in the way of a piano keyboard, and I need to know when keys are pressed (possibly simultaneously), and when they are released.
View 14 Replies View RelatedI'm trying to call some kernel functions from userspace, but I'm not sure if I'm doing it right. The functions control a pulse width modulator on an embedded platform. To pick one at random, the function:
Code:
struct pwm_device *pwm_request(int pwm_id, const char *label);
is defined in linux/pwm.h, and the implementation uses the macro EXPORT_SYMBOL(pwm_request), so I should be able to call this from user-space... right?
Anyway, I've got linux/pwm.h to #include in my source so the compiler knows what it's doing, but what do I link against? The only place in by kernel build tree where I can see a symbol pwm_request defined is in object files like vmlinux.o, built-in.o in the directory, etc. which I don't think I should be linking against.
I am looking for a way to delete the systems default gateway from the routing table via the NETLINK API.Unfortunately, the documentation I found about NETLINK is incomplete.There are some basics (communicating with the kernel, reading the routing table) but not much more.Does anyone know the packet format for deleting a routing table entry, especially deleting the default gateway? I can set or change the default gateway with the following parameters (there are more, but I left out all the non-essential ones):
NL-Msg Header:
nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
nlmsg_type = RTM_NEWROUTE;
[code]....
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?
I can give the driver code if it is necessary.
I am trying to figure out how to load the generic kernel in Grub2.
I have run the /usr/hare/mkinitrd/mkinitrd_command_generator.sh and ran the output:
Code:
Why this will not load.
As you know that GNU-C provides qsort() function in <cstdlib> in this prototype
Code:
You may know about Selection Sort Algorithm already, I want to write a function to perform Selection Sort but it can apply generally for many type: int, long, float, double... like qsort() above.
I am a windows programmer. There I wrote a firewall and VPN System. It was easy. Simply, I USED WINPKFilter by ntkernel.com.What I need is to GET, Edit, and Send the raw Layer 2 packet before reaching to IP Stack.My friends were saying that linux is Ideal for Networking purposes. But for now I say that Linux is very bad in this field and I should say that windows is much better (I beg your pardon)After tens of hours for searching I got nothing good. The hook system of IPtables is not GOOD for me because it has not Ethernet header and also the packets are defragmented when I caught them.
I tried ebtables but it has no user space queue like IPTABLES. What I exactly need is to be able to reach to the chain of raw Ethernet packets and be able to modify them and resend or inject some ethernet packet packet. I Dont Want to go inside the KERNEL. (As windows I want a userspcae library). Dear linux expert I beg your help. Do not let me turn back to windows.
I was facing trouble getting my second monitor to even get detected (GeForce GTX 260) so out of desperation i apt-get'd nvidia-glx-179 drivers, I then used Jockey to enable that driver.
Since then, whenever Ubuntu tries to boot, it kills itself. And this is the process:
I power up the tower, the screen goes that nice brown shade as I wait for the graphical ubuntu logo to show me its loading, when it eventually does it very quickly cuts into a full screen not-really-interactive terminal window that shows the boot hanging at random spots in the boot process. Theres no clear pattern. At the time of writing, it hangs on "setting sensors limits" after "Starting AppArmor Profiles".
Im going to restart again, This time it hung up at "Checking battery state..." im going to restart again, Hung up at "PulseAudio configured for per-user sessions saned disabled; edit /etc/default/saned" Ill restart again, Hung up at "Stopping userspace bootsplash"
As much fun as this is, I have a website to develop and this is seriously setting me back. All i wanted was to display the site on my second monitor so i didnt have to swap window depths in rapid succession. This is.. more trouble than it seems to be worth... How do i NOT lose my data?
Its worth noting that all the lines say "OK" next to them, not one mentions a fail of any sort.
When i Ctrl+C to break out, it doesnt, just gives me ^C
I used the Netlink mechanism before but it seems that it is not High-Efficiency.Is there another way or other ways better?
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View 1 Replies View RelatedDuring my startup I saw this line; Code: err, eth0: netlink: No such process My internet connection went down when I log on to my system.Any idea on this problem.I use realtek RTL8211CL network card,the built-in network card in my inspiron 1440.
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View 3 Replies View RelatedI switched to the generic-pae kernal image, which works great, but update now wants to update both generic and generic-pae.
How can I set it up so that it only uses generic-pae?
If I try to deselect generic in synaptic it just wants to mark it again.
I just installed gewsense on my dell studio xps. I have a dual boot with windows vista. Problem is I cant get the internet to work via lan or wireless. I have read it could be incompatibility with my hardware but wanted to know what can I do to troubleshoot and resolve.
View 3 Replies View RelatedI'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.
I'm looking for a way to access the raw data on a CD.I have a small program that I'm using to play raw PCM data pushed into stdin.I'd assumed that I could just use:play-pcm < /dev/cdromBut this isn't producing any data.Will I need to do this programatically or is there a simple way for me to grab raw data from an audio cd in the same way I might do so for a data cd?
View 2 Replies View RelatedI'm trying access binary records that were created in Borland Delphi and stored in a SQL Server database (as a BLOB). What the heck is the syntax for accessing a two-D array in C#? Here's an example:
Code:
const
MAX_BOWLERS = 8;
gMAX_FRAMES = 40;
...
type
[code]...
I've successfully got a valid "GameRec" over to C#-land. I want to access array element "GameRec.Frames[iBowler, iFrame]".
How do I define a C# type "TFrames = Array[1..Max_Bowlers, 0..gMax_Frames] of TFrame;" so that I can do it?
I have never used multidimensional array for a long time so please consider this as a newbie question. I am editing a program that uses a 4 dimensional array and I think I'm losing track of the indexes.
day = 0 to 30
hour = 0 to 23
channel = 0 to 7
len = 0 to 63
unsigned char idx[day][channel][hour][len];
I have seen that the assignment to a string is
snprintf(idx[day][hour][channel], 64, "%s/%s", dayofmonth, hourofday);
Is this correct? Because when I access with a day argument, that day value goes into the hour part.
I want to access the timestamp field of the packet being sent or received. I am not getting clear idea as to which ioctl I should use, and how it should be used in the program. Anyone explain rough flow of the program for accessing the timestamp.
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View 1 Replies View RelatedI have a single board computer previously running DOS. I recently made Linux running on it. Now that the system is running Linux, I have to translate the code that was supported by DOS. The code has segments that allow direct access of memory mapped registers through the macro _MK_FP and do read/write. I have read that where DOS allows this kind of direct memory access, Linux does not. Is there a way to do this in Linux?
View 6 Replies View Relatedi want to make a program to write the result of access to a file ,i mean for example a user wants to (open,delete,edit)a file but if he has no access to this file ,something write to a log file.so after that i can check which user got access denied by accessing to which file.or if any tools available that can do this?or if there is any built in log access file that record the permission denied to files?
View 4 Replies View RelatedI am using ssh on windows XP to remotely connect to a UNIX server that provides web application development services. The server is called snapper and is also designed to run computer-intensive engineering and GIS applications. I have been able to successful access the server. However, when I try to run an application I get an error message saying:Application initialization failed: no display name and no $DISPLAY environment variable
The ANSYS Launcher could not be started The most likely reason is that your DISPLAY environment variable I either not set (i.e. issue setenv DISPLAY dev:0.0 where dev is your device name) or is set to a device that is not accepting the connection. I was hoping someone could explain to me what the DISPLAY environment variable is and how to set it.
I've heard back and forth about whether the generic ATI drivers in Fedora 11 provides functional 3d support...as of installing F11 (64) i was impressed by the initial capability of the generic drivers but no 3d support as Desktop Effects could not be enabled.( using ATI Radeon HD 2400 ) what are the usual tips and tricks to get 3d functionality in this environment?
View 14 Replies View RelatedWhen I try to compile this code:
#include <math.h>
int main (void) {
double x, y;
x = 2;
y = sqrt(x);
return 0;
}
With the command:
$ gcc test.c
I got this message:
/tmp/cc5QZmCN.o: In function 'main':
test.c:(.text+0x16): undefined reference to 'sqrt'
collect2: error: ld returned 1 exit status
I tried this on a fresh jessie install. I have the same problem on wheezy.
i was trying to access the address of the character pointer it gives me the values stored in the variable.
Code: #include<iostream>
using namespace std;
int main()
{
char *i;
[Code]....
why is my code not giving the address of the variable i when it is a character pointer.
I am implementing c program to access ext3 file system's metadata. I want to know how to access members of the in-memory superblock structure. I am able access on-disk ext3_super_block structure but dont know how to access in- memory structure and its members.
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