The long awaited quest of the USB On-the-Go with mainline Linux kernel 4.x.
As already documented here before, it is possible to configure FriendlyARM's NanoPi Neo to behave as an USB Ethernet/RNDIS gadget device. Unfortunately this functionality relied on legacy/hacked sunxi kernel. This kernel (3 ...
The FrameDecorator example given in the documentation does not work?
If you naïvely try the implement your own MyFrameFilter following the example of the InlineFilter given in the gdb (holy?) documentation [1], you may face the following python errors.
class MyFrameDecorator(FrameDecorator): TypeError: Error when calling the metaclass ...
How to begin with nginx?
Easy, just start at the beginners' guide [1].
user www-data;
pid /run/nginx.pid;
http {
# Basic Settings
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
include /etc/nginx/mime.types;
default_type application/octet-stream;
# Logging Settings
access_log /var/log/nginx/access.log;
error_log /var ...How to start a parameterized task on a jenkins server with curl?
The answer to this question seems simple at first after seen this page [1]. Unfortunately, it does not work as described:
vjp@inabox:~$ curl -i -X POST http://localhost:8080/job/inapp_GenerateDocs/build --form file0 ...
How to run a docker container from another docker container?
Create a docker image which runs jenkins. A jenkins task will prepare a data folder to be used along with another docker container. At the end the two containers will run side by side. The container spawned by the jenkins ...
read moreYou have your shinny new Jenkins installation, but how to make it more personal? How to change the logo of Jenkins?
The butler face is nice, but what if I wanted to add something to the logo?
In <jenkins_home>, there is an interesting file named title.png coming ...
Store and load a docker image from USB storage.
# docker save -o /mnt/docker/inapp-v0.1-armhf.tar inapp # ls -l /mnt/docker/inapp-v0.1-armhf.tar -rwxr-xr-x 1 root root 212420096 Mar 28 19:27 /mnt/docker/inapp-v0.1-armhf.tar # docker load -i /mnt/docker/inapp-v0.1-armhf.tar Loaded image: inapp ...read more
Build a docker container for inapp.
Run a Debian image for tests:
sudo docker run -ti --rm debian:jessie-slim bash
...and validate the build sequence:
apt-get update apt-get install make apt-get install g++ apt-get install qtbase5-dev apt-get install libqt5websockets5-dev apt-get install liblttng-ust-dev apt-get install ...
Is it possible to run docker containers on NanoPi NEO?
Your Linux kernel version 3.4.113-sun8i is not supported for running docker. Please upgrade your kernel to 3.10.0 or newer.
Unfortuntely no, it does not work with the default legacy kernel 3.4.113-sun8i.
Preparing JSON files from command-line using Python base library.
Python has a library to process JSON by default. See [1].
Using Python on command-line, simple scripts can be written for preparing JSON configurations (e.g., with a Makefile).
Want to stringify a JSON file in order to embedded it ...
Installing inapp on Armbian.
Update everything after the fresh installation to get the latest kernel and packages:
apt-get update apt-get upgrade
Disable the NetworkManager deamon and save ~6MB of RAM:
root@nanopineo:~# systemctl disable NetworkManager Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service. Removed symlink /etc/systemd/system/multi-user ...read more
Setting-up the USB OTG port as an Ethernet 'gadget' device.
sunxi is the community working on the open-source environment for Allwinner chips... but it has to be kept in mind, and they write it right on the top of the front page [1], that:
Allwinner [...] is violating the ...
Now the operating system. Take two with Armbian.
Get the OS image Armbian_5.25_Nanopineo_Ubuntu_xenial_default_3.4.113.7z at [1].
Write the image to the SD-card (4GB min):
sudo dd if=Armbian_5.25_Nanopineo_Ubuntu_xenial_default_3.4.113.img of=/dev/mmcblk0 ...
Now the operating system. Take one with the official image from FriendlyArm.
Get the OS image nanopi-neo-ubuntu-core-qte-sd4g-20170204.img.zip at [1].
Write the image to the SD-card (4GB min):
sudo dd if=nanopi-neo-ubuntu-core-qte-sd4g-20170204.img of=/dev/mmcblk0 bs ...
Cute little ARM board (inner active ingredient) + Tiny 3D-printed housing (color plastic hull) + Transparent sticker (attractive branding) = your new medication for pretty printing.
The Nano Pi Neo is a cheap Chinese ARM board with everything needed (Ethernet, On-the-Go USB) and a tiny 40x40mm form-factor [1].
The ...
How to serve a website by merging multiple base folders?
mod_alias is the answer! [1]
/opt/ina/all/www/
term/www/
cli/www/
pp/www/
dbg/www/
alias.url += ( "/all" => "/opt/ina/all/www/" ) alias.url += ( "/term" => "/opt/ina/term/www/" ) [...]
/etc/lighttpd/conf-available/50-inaterm.conf:
server.modules += ( "mod_alias" ) alias ...read more
How to create a systemd-friendly QWebSocket server?
Surprisingly, there does not seem to be any official Qt documentation for this use-case. Enjoy.
The keyword here is socket-based activation. [1]
systemd will create the socket first and listen to incoming connections. On first incoming connection, the ...
What is this timestamp in each kernel printk message?
Quote from [1].
Printk-time uses the routine sched_clock() in the kernel. On some platforms, sched_clock() only has a resolution of 1 jiffy (which may be 10 milliseconds or longer). This means that you will only see the time increment at this ...read more
Prepare a Debian virtual image to build packages.
Get the netinstall 248MB image (e.g., debian-8.7.1-amd64-netinst.iso) at this address [1], and start a new virtualbox machine.
Only need a minimalistic system.
Ready!
A short introduction ...
Highly insecure!
Create a user with a password, and delete it later ([1]):
root@inabox:/home/ina# adduser test [...give a password...] root@inabox:/home/ina# passwd -d test passwd: password expiry information changed.
In /etc ...
Initial example for setting a kernel tracepoint and forward the trace output over DLT (Autosar Diagnostic Log and Trace).
This example is taken straight out of the Linux kernel documentation at [1]. For details about the kprobes internals, see [2].
# The tracing facility is in the ...
https://wiki.linuxfoundation.org/images/1/1c/Network_data_flow_through_kernel.png https://wiki.linuxfoundation.org/networking/kernel_flow
perf uses kprobes/uprobes for dynamique tracing.
perf for ...
read moreHow do Linux kernel probes (kprobes) work
Everything below comes from reading kprobes.txt at [1].
There are kprobes and jprobes. jprobes are specialized kprobes for function calls, making it easier to get the function parameters. It is usually useful to filter function call traces according to the value ...
What else is happening again?
(process:704): GLib-WARNING **: poll(2) failed due to: Invalid argument.
$ sysctl net.core.somaxconn net.core.somaxconn = 128
$ find /usr/include -name socket.h /usr/include/asm-generic/socket.h /usr/include/linux/socket.h /usr/include/x86_64-linux-gnu/bits/socket.h /usr/include/x86_64-linux-gnu ...
But wait! What happens when I use Chinese input? ...types CTRL+Space and start composing... Oh shit!~ [1]
Capturing key strokes is nice, but it does not support virtual keyboard like on tablet or smartphones and more advanced input methods such as Chinese/Japanese or other writing systems.
The problem ...
read more
std::string l;
// Read lines here
while(std::getline(std::cin, l))
{
// Send Unicode string
emit newLine(QString::fromStdString(l));
}
This works because \n (newline) is a single byte in UTF-8.
char c;
// Read bytes here
while(std::cin.get(c))
{
// Send Unicode single ...A story which begins on the keyboard, goes through a pseudo-terminal, and ends up on the screen.
Now that you love ptypipe (see previous post), we are ready to pipe everything and finally control gdb:
$ makefifo input.cli $ python ptypipe.py "" "gdb -q" < input.cli | myGreatControlProgram > input.cli
You can pipe commands to gdb, but how to have auto-complete on those commands?
A initial little try is promising, we can pipe commands to gdb:
~$ echo "show endian" | gdb -q (gdb) The target endianness is set automatically (currently little endian) (gdb) quit
The command show endian was ...
Questioning about the "target triplet" <CPU>-<vendor>-<OS> used by the GNU build system to describe a target
When building gdb targeting a different platform, one must choose --host, --build, and --target parameters.
The target parameter has the following format [1]:
<CPU>-<vendor>-<OS>
You can get the target of ...
read moreMany websites host HTML rendering of man pages. How to make them yourself?
Stackoverflow always has an answer for those questions [1].
A tool without many dependencies is mandoc [2], and of course, it has its mandatory HTML man page there [3].
./configure make ./mandoc -Thtml -Ostyle=mandoc.css ../man-pages-4 ...read more
gcc has an extensive documentation [1] in the texinfo format (.texi file extention). texinfo [2] can be converted into many different output formats, such as HTML, PDF, ...and generic XML.
I would like to write a quick-and-dirty script to extract the description of each command-line argument of gcc. I could ...
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