View source for Automatically launch your application

You've just developed a state of the art application and want it to be launched each time you boot your APF ? Then this small tutorial is for you !

==System startup==
First, a small remainder: when you start your board, here is how all things are started:
# U-Boot initializes the processor, vital peripherals and then load Linux image from Flash,
# U-Boot starts Linux image by passing it some parameters, the ''bootargs'',
# Linux starts, mounts its rootfs and launches ''/sbin/init'',
# ''init'' process checks its ''/etc/inittab'' config file and executes the instructions it contains,
# this config file generally asks ''init'' to launch ''/etc/init.d/rcS'' at some point,
# ''/etc/init.d/rcS'' look at all scripts in ''/etc/init.d/'' directory which start with a '''S''', and executes them in ascending order

==Adding your own application in the start process==
* creates a shell script in ''/etc/init.d/'':
<pre class="apf">
 # touch /etc/init.d/S99app
 # chmod a+x /etc/init.d/S99app
</pre>
* edit it
<pre class="apf">
 # vi /etc/init.d/S99app
</pre>
* put in it the following content (replace ''/usr/bin/your_app'' with your application name & path):

<source lang="bash">
#!/bin/sh

# Loading the modules needed by my app:
modprobe xxxxx
 
# Launching my app:
/usr/bin/your_app &          # <-- Don't forget the "&" otherwise other system stuff won't start until you leave your app !!!

exit 0
</source>
* save your changes and '''!! Test it !!'''
<pre class="apf">
# /etc/init.d/S99app
</pre>

* That's it ! You can now reboot:
<pre class="apf">
# sync
# reboot
</pre>

==Links==
* [[Linux_Boot_Logo| How to customize your boot Logo]]

[[Category:Startup]]