Hello I am trying to create an custom application where I can read and write to the files. I can use it using stdio.h library in C code. How can use this operation while building with yocto. I can create an executable, when the flash the image on my microcontroller built with my application it says there is no input files (Yocto dosnt do file handling)
Do i need to do kernel configuration? (If yes how should i do it)
inherit autotools pkgconfig
inherit meson
PRIORITY = "optional"
SECTION = "examples"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
SRC_URI = "file://appxyz/"
S = "${WORKDIR}"
B = "${WORKDIR}/build_dir"
MESON_SOURCEPATH = "${S}/appxyz"
do_install() {
install -d ${D}${bindir}
install -d ${D}${libdir}
install -m 0755 ${B}/appxyz ${D}${bindir}
}
FILES_${PN} += "${bindir}/ ${bindir}/appxyz"
This is recipe for my application, appxyz is the executable, how can change it to reading files?
Related
I added iptables package to my device image, using CORE_IMAGE_EXTRA_INSTALL += "iptables".
I tried to run it on the device and get the following error message:
modprobe: FATAL: Module ip_tables not found in directory /lib/modules/4.9.11-1.0.0+gc27010d
iptables v1.6.1: can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
Seems like I have missing kernel module.
Need your help in adding standard kernel module to the image (Where can I find all modules files and how should I add and load it to the image).
You must add the iptables module to your kernel. I had the same problem and I could solve it with these steps:
Run bitbake -c menuconfig virtual/kernel
Activate CONFIG_IP_NF_IPTABLES module (you can search its location on that menu typing slash '/').
Save it and run bitbake -c savedefconfig virtual/kernel for saving that file as a defconfig.
Copy defconfig file from returned path to yocto-distro/layer-name/recipes-kernel/linux/files/ (make this directory if it does not exist).
Create a .bbappend file inside yocto-distro/layer-name/recipes-kernel/linux/ with the same name as your original recipe file from meta layer.
Edit your file and append lines below:
SRC_URI += "file://defconfig"
KERNEL_DEFCONFIG = "${WORKDIR}/defconfig"
FILESEXTRAPATHS_prepend := "${THISDIR}/files"
~
Relaunch bitbake your-image-name
It worked on my situation. Btw, I got that info from the following webs:
http://variwiki.com/index.php?title=Yocto_Customizing_the_Linux_kernel
https://www.linuxtopia.org/Linux_Firewall_iptables/x651.html
Have a nice day! :D
My app uses library: boost, ffmpeg (avcodec, avformat,...). I want to pack my app to run on Ubuntu 14 or higher. I don't want to use static build.
I have checked on some computers which install Ubuntu. Here is results:
Ubuntu 14.04:
ls -l libavcodec*
libavcodec.a
libavcodec.so -> libavcodec.so.54.35.1
libavcodec.so.54.35.1
ls -l libboost_thread*
libboost_thread.a
libboost_thread.so -> libboost_thread.so.1.54.0
libboost_thread.so.1.54.0
Ubuntu 16.04:
ls -l libavcodec*
libavcodec.a -> libavcodec-ffmpeg.a
libavcodec-ffmpeg.a
libavcodec-ffmpeg.so -> libavcodec-ffmpeg.so.56.60.100
libavcodec-ffmpeg.so.56 -> libavcodec-ffmpeg.so.56.60.100
libavcodec-ffmpeg.so.56.60.100
libavcodec.so -> libavcodec-ffmpeg.so
ls -l libboost_thread*
libboost_thread.a
libboost_thread.so -> libboost_thread.so.1.58.0
libboost_thread.so.1.58.0
My app
objdump -p ControlStation | grep NEEDED
NEEDED libavcodec-ffmpeg.so.56
NEEDED libavformat-ffmpeg.so.56
NEEDED libavutil-ffmpeg.so.54
NEEDED libswscale-ffmpeg.so.3
NEEDED libboost_system.so.1.58.0
NEEDED libboost_thread.so.1.58.0
....
I compile on Ubuntu 16, so my app uses file libavcodec-ffmpeg.so.56 and libboost_thread.so.1.58.0. Therefore, it couldn't run on other computers.
Normally, a shared library should be
libName.so ---> libName.so.MAJOR
libName.so.MAJOR --> real library file
But ffmpeg has many versions, boost library doesn't have symbolic file libboost_thread.so.1
Could anyone help me about this problem ? Thank you !
I am working on yocto, I want to compile some C files in yocto and install the resulting binary to external filesystem.
Before doing that I tried creating a separate reciepe and compile c code from it.
I am unable to compile it.
I am not sure to understand the question since it is not precise enough.
Including C files in recipe tree
If you want to have the C files in your recipe, having a file tree like this:
recipe-example/example/example_0.1.bb
recipe-example/example/example-0.1/helloworld.c
You can generate this example when you create a new layer using
yocto-layer <your-layer-name>
Your bb file will look like this:
#
# This file was derived from the 'Hello World!' example recipe in the
# Yocto Project Development Manual.
#
SUMMARY = "Simple helloworld application"
SECTION = "examples"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
SRC_URI = "file://helloworld.c"
S = "${WORKDIR}"
do_compile() {
${CC} helloworld.c -o helloworld
}
do_install() {
install -d ${D}${bindir}
install -m 0755 helloworld ${D}${bindir}
}
It will compile the hello world file and install it into /usr/bin on your image.
From a Git repo
You also can compile from a git repository, I advise you to read the manual and examples in your yocto folder. Here is an example here of wiringPi:
DESCRIPTION = "A library to control Raspberry Pi GPIO channels"
HOMEPAGE = "https://projects.drogon.net/raspberry-pi/wiringpi/"
SECTION = "devel/libs"
LICENSE = "LGPLv3+"
LIC_FILES_CHKSUM = "file://COPYING.LESSER;md5=e6a600fd5e1d9cbde2d983680233ad02"
# tag 2.29
SRCREV = "d79506694d7ba1c3da865d095238289d6175057d"
S = "${WORKDIR}/git"
SRC_URI = "git://git.drogon.net/wiringPi \
file://0001-Add-initial-cross-compile-support.patch \
file://0001-include-asm-ioctl.h-directly-for-_IOC_SIZEBITS.patch \
"
COMPATIBLE_MACHINE = "raspberrypi"
CFLAGS_prepend = "-I${S}/wiringPi -I${S}/devLib"
EXTRA_OEMAKE += "'INCLUDE_DIR=${D}${includedir}' 'LIB_DIR=${D}${libdir}'"
EXTRA_OEMAKE += "'DESTDIR=${D}/usr' 'PREFIX=""'"
do_compile() {
oe_runmake -C devLib
oe_runmake -C wiringPi
oe_runmake -C gpio 'LDFLAGS=${LDFLAGS} -L${S}/wiringPi -L${S}/devLib'
}
do_install() {
oe_runmake -C devLib install
oe_runmake -C wiringPi install
oe_runmake -C gpio install
}
It is fetching from a git repository, applying patches generated by git, using oe_runmake to compile with the makefiles.
With devtool
It has been asked in a comment on how to add a recipe with devtool.
We will still use wiringPi as an example again. Download it doing
https://github.com/WiringPi/WiringPi
The Makefile is is the folder wiringPi.
You can then do
devtool add <name_of_recipe> <path_to_Makefile_folder>
Take care of the warning from devtool
NOTE: Creating workspace layer in /home/dbensoussan/new_poky/poky/build/workspace
NOTE: Enabling workspace layer in bblayers.conf
NOTE: Using source tree as build directory since that would be the default for this recipe
NOTE: Recipe /home/dbensoussan/new_poky/poky/build/workspace/recipes/project/project.bb has been automatically created; further editing may be required to make it fully functional
This is generating the recipe as follow:
# Recipe created by recipetool
# This is the basis of a recipe and may need further editing in order to be fully functional.
# (Feel free to remove these comments when editing.)
#
# WARNING: the following LICENSE and LIC_FILES_CHKSUM values are best guesses - it is
# your responsibility to verify that the values are complete and correct.
LICENSE = "Unknown"
LIC_FILES_CHKSUM = "file://COPYING.LESSER;md5=e6a600fd5e1d9cbde2d983680233ad02"
# No information for SRC_URI yet (only an external source tree was specified)
SRC_URI = ""
# NOTE: this is a Makefile-only piece of software, so we cannot generate much of the
# recipe automatically - you will need to examine the Makefile yourself and ensure
# that the appropriate arguments are passed in.
do_configure () {
# Specify any needed configure commands here
:
}
do_compile () {
# You will almost certainly need to add additional arguments here
oe_runmake
}
do_install () {
# This is a guess; additional arguments may be required
oe_runmake install 'DESTDIR=${D}'
}
You can then edit your recipe to suit your configuration
With externalsrc
It is possible to use a directory present on the filesystem by using externalsrc.
I did not try it myself, nor have I the workspace ready to do, but #71GA in the comment tested the tutorial from the Koan software company https://wiki.koansoftware.com/index.php/Building_Software_from_an_External_Source and it worked. I will copy the content here:
in this case use the externalsrc class - you can inherit this in the original bb recipe or a bbappend:
inherit externalsrc
EXTERNALSRC = "/path/to/sources"
Depending on the type of build (eg, 'inherit module' for out of tree Linux kernel modules) you may or may not need to set EXTERNALSRC_BUILD.
inherit externalsrc
EXTERNALSRC = "/some/path"
EXTERNALSRC_BUILD = "/some/path"
If you're going to use it across a number of recipes you can inherit it globally at the configuration level (perhaps via an inc file that you include/require there):
INHERIT += "externalsrc"
EXTERNALSRC_pn-<recipename> = "/path/to/sources"
Recipe example using an external source for nInvaders package
#
# Recipe example with externalsrc
#
# (C)2019 Marco Cavallini - KOAN - <https://koansoftware.com>
#
LICENSE = "CLOSED"
LIC_FILES_CHKSUM = ""
inherit externalsrc
EXTERNALSRC = "/home/koan/yocto-qemuarm-sumo/ninvaders-0.1.1"
EXTERNALSRC_BUILD = "${EXTERNALSRC}"
DEPENDS = "ncurses"
EXTRA_OEMAKE = "-e"
do_install() {
install -d ${D}${bindir}
install -m 0755 nInvaders ${D}${bindir}
}
FILES_${PN} = "${bindir}/*"
You can just go to the official documentation to find your answer.
In the chapter 7.3 Writting a New Recipe of the yocto mega-manual, the very first example is exactly is what you need (Single .c File Package (Hello World!)).
I want to use a webservice in C code. I am trying to make a client. I need something to do what Axis2java does and generates the classes from a wsdl files.
I found that Axis2c makes (.c) files generated from wsdl file.
I downloaded it from here . unzipped it. I created the environment variable for AXIS2C_HOME and I created AXIS2C_CLASSPATH.
but I can't make it work.
when I type this command :
WSDL2C -uri -ss -sd -d none -u -f -o
I get this error :
echo off
Error: Could not find or load main class org.apache.axis2.wsdl.WSDL2C
how can I solve this problem. and please tell me how to use this Axis2c tool properly.
Thank you in advance.
#loentar : I installed Axis2/Java and I set the environment variable for it. now I run the wsdl2c.bat I get this :
E:\dev\Tools\axis2c-bin-1.6.0-win32\bin\tools\wsdl2c>WSDL2C.bat
E:\dev\Tools\axis2c-bin-1.6.0-win32\bin\tools\wsdl2c>echo off
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
-d32 use a 32-bit data model if available
-d64 use a 64-bit data model if available
-server to select the "server" VM
The default VM is server.
-cp
-classpath
A ; separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D=
set a system property
-verbose:[class|gc|jni]
enable verbose output
-version print product version and exit
-version:
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -no-jre-restrict-search
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:...|:]
-enableassertions[:...|:]
enable assertions with specified granularity
-da[:...|:]
-disableassertions[:...|:]
disable assertions with specified granularity
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:[=]
load native agent library , e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:[=]
load native agent library by full pathname
-javaagent:[=]
load Java programming language agent, see java.lang.instrument
-splash:
show splash screen with specified image
See http://www.oracle.com/technetwork/java/javase/documentation/index.html for m
ore details.
after that I run this command :
E:\dev\Tools\axis2c-bin-1.6.0-win32\bin\tools\wsdl2c>WSDL2C.bat -uri hello.wsdl
-u -uw
E:\dev\Tools\axis2c-bin-1.6.0-win32\bin\tools\wsdl2c>echo off
Unrecognized option: -uri
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
what can I do ?
I'm using windows 8 by the way.
In addition to Axis2/C you must have Axis2/Java installed.
AXIS2_HOME must point to Axis2/Java installation.
For details please see README of codegen.
The complete list of commands to create and compile client is:
# create stubs
sh $AXIS2C_HOME/bin/tools/wsdl2c/WSDL2C.sh -uri Calculator.wsdl -u -uw
# implement main() in src/your_client.c
# see samples/codegen/client/calculator for example
# compile and link client
gcc -o calculator_client src/*.c -I$AXIS2C_HOME/include/axis2-1.6.0 -L$AXIS2C_HOME/lib -laxutil -laxis2_axiom -laxis2_parser -laxis2_engine -lpthread -laxis2_http_sender -laxis2_http_receiver -ldl -Wl,--rpath -Wl,$AXIS2C_HOME/lib
I set the envinroment variable for JAVA_HOME, AXIS2_HOME, AXIS2C_HOME, and added their lib folder to CLASSPATH. after running this command:
WSDL2C.bat -uri hello.wsdl -u -uw
I got this message:
echo off
Error: Could not find or load main class org.apache.axis2.wsdl.WSDL2C
I found the solution myself. :)
I double checked if I had created the environment variable for AXIS2_HOME and I saw that it is there, correctly.
in spite of it's existence I tried to set it again in command prompt. so I typed:
SET AXIS2_HOME=E:\dev\Tools\axis2-1.6.2
then I typed the command for WSDL2C code generator:
WSDL2C.bat -uri hello.wsdl -u -uw
And BAM ! it worked properly.
Now I can generate C files from WSDL file.
I am just beginning to develop a simple openssl engine. In this process, I referred to this nice website http://sinodun.com/2009/02/developing-an-engine-for-openssl/
I downloaded openssl 1.0.0c and compiled in my own folder as follows:
./config --prefix=/home/workingDir/openssl --openssldir=/home/workingDir/openssl
make
make install
Then I proceeded to copy this simple_engine.c file and compiled it to simple_engine.o and then built shared library simple_engine.so.
These are found in 'workingDir'
After these steps, I changed the 2 openssl.cnf files available under openssl/apps and openssl1.0.0c/ main folders such that:
openssl_conf = openssl_def
[openssl_def]
engines = engines_section
[engines_section]
simple = simple_section
[simple_section]
engine_id = simple
dynamic_path = /home/workingDir/simple_engine.so
MODULE_PATH = /home/workingDir/simple_engine.so
init = 0
[req]
distinguished_name = req_distinguished_name
[req_distinguished_name]
After this I set the LD_LIBRARY_PATH to point to /home/workingDir
Then when I did:
./openssl engine
I get the following error:
Error configuring OpenSSL
3076019848:error:25066067:DSO support routines:DLFCN_LOAD:could not load the shared library:dso_dlfcn.c:185:filename(/home/workingDir/simple_engine.so): /home/workingDir/simple_engine.so: undefined symbol: ENGINE_get_static_state
3076019848:error:25070067:DSO support routines:DSO_load:could not load the shared library:dso_lib.c:244:
3076019848:error:260B6084:engine routines:DYNAMIC_LOAD:dso not found:eng_dyn.c:450:
3076019848:error:260BC066:engine routines:INT_ENGINE_CONFIGURE:engine configuration error:eng_cnf.c:204:section=simple_section, name=dynamic_path, value=/home/workingDir/simple_engine.so
3076019848:error:0E07606D:configuration file routines:MODULE_RUN:module initialization error:conf_mod.c:235:module=engines, value=engines_section, retcode=-1
What is the problem? Please help. I am unable to proceed and don't find any documentation.
Thanks
The problem was the MODULE_PATH in the openssl.cnf. When I removed it , it works after recompiling the openssl with shared libs!