Programming :: Use Generic Netlink Receive Function - Error "sendmsg(); If(recvmsg() < 0)"
Jan 2, 2010
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).
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Jun 7, 2010
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]...
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Apr 15, 2010
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]....
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Apr 20, 2010
I'm learning how to program kernel drivers, and I'm making a hello world module for that. But I can't find the cause of some errors... My module as three files:
test_regulator.c: Code: /*test_regulator.c
2 */
3 #include <linux/test_regulator.h>
4 #include <linux/module.h>
5 #include <linux/kernel.h>
6 #include <linux/regulator/driver.h>
code....
I don't understand, because I had declared the test_regulator_driver.
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Nov 11, 2010
I have been trying to build a file called main.cpp through my make file which is in Linux.
There are functions like
Which are being called. I have included all the necessary headers and also have included the necessary lib.a files in the make file as below:
I am still getting the below error. I use make -j makefile.mak clean all command to make the build.
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Oct 9, 2010
I'm trying to compile the hidtouch driver, but hit a snag. The error I get is
[code]....
Context: this is the driver for the touchscreen attached to an LTSP client. The server uses the AMD64 arch, the client uses the 1386 arch, both Debian. The client does start, but lacking a pointer device the pointer is useless. The build takes place on the server, in the i386 chroot of the LTSP setup. Basically, I'm stuck now...
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Nov 5, 2010
Am getting errors about "mysql_connect()" for the following code:
Have compiled PHP with MySQL support using the following:
Thought PHP 5.3 has a built-in replacement called mysqlnd, and there's no need to install "php-mysql" RPM.
However, according to the following site this is still required: [url]
Give me an idea whether I really have to install php-mysql RPM in order to use mysql_connect() for PHP?
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Apr 13, 2011
I've having problems with my Makefile.
I'm trying to create a program from 2 files - main.cpp that contains the main function, and modules.c that contains the definitions of the functions that are called in main(). modules.c only contain function definitions, no main function.
My Makefile is as follows:
Code:
I have included "modules.h", which contains all the function declarations, in my main.cpp.
When I try to make using this Makefile, I get the error
Code:
If I switch the order of modules.o and main.o in my $(TARGET) line, then I get errors that say "undefined reference to" the functions I have defined in modules.c, in main.cpp.
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Aug 1, 2010
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.
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Nov 16, 2010
Code:
#include <iostream>
using namespace std;
[code]...
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May 18, 2010
I am doing some Linux kernel programming for my research project. I need to record the timestamp (by using cpuid and rdtsc) when an interrupt handler (top half) is first invoked. Due to the time critical nature of the problem itself, I have to do the timestamping inside the interrupt handler itself (the first operation when the handler is called). However, I understand that tasks that are not so time critical should be deferred to a tasklet function (bottom half) for processing because other interrupts are disabled in a (top-half) interrupt handler. I am currently out of idea on how I can pass the timestamp information that I have obtained in the interrupt handler to the corresponding tasklet function.
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Jul 19, 2011
I wrote a test program for learning usage of realloc() and I thin I did everything right but I get this error exactly with my 4th time that while tries to reallocate memory in MakeDSt function for DSt->SArray:
Quote:
realloc(): invalid next size
this is my complete code :
Code:
#include <stdio.h>
#include <stdlib.h>
typedef struct DRA
{
code....
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Aug 31, 2010
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.
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Apr 2, 2010
what "Message too long" error returned by the function dn_expand means?
The function call I used is as follows:
dn_expand(poutput, poutput + output_space_used, *out_rr, output_qname, 255);
I assumed that the error was due to the difference between the 1st argument and 2nd argument, However, changing the difference to the accepted dns message size (512 bytes) or even to no difference at all did nothing to remove the error.
Further, I am trying to check the output after having first compressed a domain name using dn_comp into *out_rr. This function call is in order to check whether the compression is happening correctly.
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Mar 3, 2010
I have a shell script 'Test.sh' echo "Enter The File Name" read FILE_NAME echo "Enter The First Column"
read Col
RowNum=2
Diff=4
Data=" "
ColNumFrom=`grep -i $Col Data.csv | cut -d "," -f2`
ColNumFrom=`expr $ColNumFrom - 1`
[Code]...
When I run the File for Col 'AA02', it works fine but for Col as 'AB01', is throws following error sed: Function 2s@(.{302}).{4}@1 @ cannot be parsed.
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May 24, 2010
I want to declare a function in a function, but had no success till now, see the error code below and visit the project at sourceforge
[Code]...
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Jun 20, 2010
I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.
#!/bin/bash
addelementtoarray()
{
local arrayname=$1
[code]....
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Feb 6, 2010
I'm trying to debug a gtk app on ubuntu that crashes from time to time when I open a dialog. Lately I have found a sequence of actions that always reproduces the bug. And I always get this error: Assertion 'pthread_setspecific(t->key, userdata) == 0' failed at pulsecore/thread-posic.c:200, function pa_tls_set(). Aborting.
So my app seems to crash because an error in pulseaudio, which is strange. I made some google search and apparently, this problem exists with other apps. Then, following a suggestion in a bug report, I opened sound-preferences and disabled windows and buttons sounds. And surprise? No more crash. I know that gtk handles events from windows and buttons and so does pulseaudio. So, could it possibly be a bug in pulseaudio instead of in my app? Does anyone have an idea of what's going on here?
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Jan 4, 2011
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.
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Apr 1, 2010
I just completed migrating a Redhat 9 server to new hardware and a virtual machine. If I attempt to alter the time or date with the date command I receive the following message. "date: relocation error:/lib/tls/lib pthread.so.0: symbol __resp, version GLIBC_PRIVATE not defined in the file libc.so.6 with link time reference"
This also comes up during the bootup process along with "sleep: relocation error". I have never done I migration like this before and would consider myself a novice to linux. This server runs an old software package and I would prefer not having to totally reload it. The software we run appears to be run fine at first glance but I don't want to roll this out until all errors are resolved..
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May 14, 2010
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.
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Mar 17, 2009
I'm not sure what when wrong since I have a few DVDs and they all play well in my normal DVD player, I later attempt to mount it in my Ubuntu 8.10 I'm presented with the following message:
DBus error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
May I know what does this really mean?Is there something in my computer that require a fix?
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May 11, 2010
I am trying to send data via UDP using sendmsg on the sending side, and recvfrom() on the receiving end.The setup for my data is to have an iovec that has a packet hdr, followed by an iovec that has a payload, then to have subsequent sets of these two types of iovecs. On the receive end, I have a while true loop that does a recvfrom() receiving a size of 1 hdr/payload combination.When I do send out a message that has a total of just 4 iovecs (hdr/payload/hdr/payload) and I use recvfrom on the remote end with a receive size of a hdr/payload set,only the first hdr/payload of the sendmsg is received.I was under the impression that using this while true loop would allow me to receive multiple sets of this hdr/payload combination that is sent out by sendmsg().
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Feb 16, 2010
I couldn't install everything during setup of my debian server, so I installed post setup through the Add/Remove Programs. My guess is there is so much installed that either DHCP is not setup properly or there is a firewall installed. My computer found an IP address from my router but cannot connect to the DNS service or ping my router. I type: ping 192.168.1.1 computer resp: "ping: sendmsg: Operation not permitted"
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Apr 28, 2010
I've recently decided to migrate the infrastructure in my workplace from ubuntu to fedora, every thing except the printers went perfectly. When I try to print as an user It just throws an generic error and stops, as a root it doesn't even show the error.
This is the debug log:
Code:
D [28/Apr/2010:04:22:03 +0200] cupsdSetBusyState: Dirty files
D [28/Apr/2010:04:22:03 +0200] cupsdReadClient: 12 POST / HTTP/1.1
D [28/Apr/2010:04:22:03 +0200] cupsdSetBusyState: Active clients and dirty files
D [28/Apr/2010:04:22:03 +0200] cupsdAuthorize: No authentication data provided.
D [28/Apr/2010:04:22:03 +0200] cupsdReadClient: 12 1.1 Get-Jobs 1
D [28/Apr/2010:04:22:03 +0200] Get-Jobs ipp://localhost/printers/ .....
It worked fine in debian and ubuntu, so we can assume that the drivers are ok, any ideas?
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Apr 29, 2011
I am trying to install fltk-2.0.x-alpha-r8570 on Ubuntu 10.04, I get following error during make process
Code:
root@programmer-desktop:/opt/fltk-2.0.x-r7680# make
=== making src ===
Makefile:223: makedepend: No such file or directory
Compiling add_idle.cxx...
add_idle.cxx:1: error: bad value (generic) for -mtune= switch
[code]....
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Feb 27, 2011
I'm on Ubuntu 10.10 - fresh install 2 days ago, I marked all packages for upgrade in Synaptic, everything upgraded except 'linux-image-2.6.35-22-generic' kernel image. Now everytime I use apt-get or synaptic it takes ages as it tries to update the kernel image every time. The error I am receiving is as follows:
[Code]....
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Sep 16, 2010
fit a surface i.e. W(x,y) using svdfit() provided by "Numerical Recipes in C". svdfit() is written for curve fitting and not for surface fitting.But one can use svdfit(), as claimed by authors of NR book, to do surface fitting. On page 680 of NR book, authors have given a hint on how to use svdfit() for fitting a surface. But I have not understood it.This link may be helpful (Chapter 15 th is relevant here.):[URL]This is my problem:
Code:
I have a set of 100 numbers. I want to fit a 2-Dimensional function W(x,y) to these numbers.
[code]....
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May 11, 2015
I am trying to build a socket to retrieve the ethernet packets from ECU(I do not know much about the ECU). When i run my code on windows there is no problem and the code runs correctly. But when i run my code on Debian it gets stuck at s.recv(1024).
I have already set static ip in /etc/network/interfaces as follows:
Code: Select alliface eth0 inet static
address 160.48.199.91
netmask 255.255.255.0
gateway 160.48.199.254
The simple code is as below:
Code: Select all import socket
import sys
HOST = "160.48.199.91"
port = 30490
s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_UDP)
s.bind((HOST, 30490))
while True:
data = s.recvfrom(1024)
print(data)
There is no LAN or Router. When i check netstat -s i see that there are 0 UDP and 0 TCP messages received. But when i check in Wireshark on Debian i could see the displayed UDP packets. Does it mean that the UDP packets are reaching the Raspberry Pi but not received by Debian ? Or are these packets being dropped?
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Jun 8, 2010
I have configured pppoe connection via NetworkManager through key-file plugin. The problem is that after a while i cant load any web page. All connections r up, nothing bad in /var/log/messages. Ping produce mystical error message:
Code:
sendmsg: no buffer space available
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