Auto-Running a C Program on Raspberry PI

问题

how can I make my C code to auto-run on my Raspberry PI? I have seen a tutorial so as to achieve that but I do not really know what I am still missing. My initialization script is shown as it follows:

#! /bin/sh
# /etc/init.d/my_settings
#
# Something that could run always can be written here
### BEGIN INIT INFO
# Provides:     my_settings
# Required-Start:   $remote_fs $syslog
# Required-Stop:    $remote_fs $syslog
# Default-Start:    2 3 4 5 
# Default-Stop: 0 1 6
# X-Interactive:    true
# Short-Description:    Script to start C program at boot time
# Description:      Enable service provided by my_settings
### END INIT INFO

# Carry out different functions when asked to by the system
case "$1" in 
start)
echo "Starting RPi Data Collector Program"
# run application you want to start
sudo /home/pi/Documents/C_Projects/cfor_RPi/charlie &
;;
stop)
echo "Killing RPi Data Collector Program"
# kills the application you want to stop
sudo killall charlie
;;
*)
echo "Usage: /etc/init.d/my_settings {start | stop}"
exit 1  
;;
esac
exit 0

The problem is that my program does not run at boot time and I do not really know why. What would I be missing? Is this "killall" statement "killing" some useful process during execution time? I am making this code to run as a background application but I know that after a few seconds, when the RPi is initializing, it asks for an username and a password in order to initialize the session. Is it possible that my RPi is not executing this code because I am not providing the logging information? I do not have a monitor so that my program has to run once I plug my Rpi in. Thanks a lot in advance!!

回答1:

How scripts/services are run at startuptime, generally depends on the type of init system used. Off the top of my head, I'd distginguish the following 4 types:

Embedded style: A single shell script has all the commands to start the system. Usually the script is at one off the paths the kernel tries to start as init process.
BSD style
System V style: This uses /etc/inittab and latr scripts in /etc/rc*.d/ to start services one by one
systemd

Raspbian dervices from Debian, so I suppose System V style. You have to symlink your script to /etc/rc2.d like

ln -s /etc/init.d/your-script /etc/rc2.d/S08my-script

Not the structure of the link name: It says, it should be started when the run level is entered, and the '08' determines the position (do a ls /etc/rc2.d/ to see the other links).

More details: init(8).

update-rc.d(8) is the proper wway to create the symlinks on debian. See the manpage:

update-rc.d - install and remove System-V style init script links

I advice to read at least the man pages update-rc.d(8) and init(8).

回答2:

You'll have to create links to that init script in the proper /etc/rcX.d folders. On raspbian this is done by:

sudo update-rc.d YOUR_INIT_SCRIPT_NAME defaults

You can read this debian how-to for further information. Also you should read more about run levels in Debian.

回答3:

http://www.akeric.com/blog/?p=1976

Here a tutorial on how to auto-loggin and start a script at boot.

If it still don t work, there s either a problem in your script or in your C program.

来源：https://stackoverflow.com/questions/18197252/auto-running-a-c-program-on-raspberry-pi

标签

Linux

raspberry-pi

raspbian