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Home » U++ Library support » U++ Core » Write an app to start and kill another app periodically
Re: Write an app to start and kill another app periodically [message #26389 is a reply to message #26388] Thu, 29 April 2010 17:51 Go to previous messageGo to previous message
koldo is currently offline  koldo
Messages: 3443
Registered: August 2008
Senior Veteran
jpderyck wrote on Thu, 29 April 2010 17:33

Hello,
Under Linux, I would like to write a small application which can check for a hung application periodically. If it is hung, it should kill the process and restart the application.

The application to be checked periodically was written in u++: it reads a data module acquisition connected by usb every 10 seconds. It runs for +/- 2 months and then it crash. I suppose the problem is with the usb driver or the usb module itself. I made the same program reading a different module connected by rs232 port with no problem.

I know that I have to use command like 'killall app'
How to start this kind of command from an u++ gui program ?

The best should be if the small checking app was a linux service. I saw a service app sample for windows, but does anybody have sample for linux ?

best regards
Jean-Paul


Hello jpderyck

I am not an expert but this works.

You can use function int kill(pid_t pid, int sig);

pid is the id of the process to be killed.

There are these options from less to more aggresive:

#include <sys/types.h>
#include <signal.h>
#include <unistd.h>
...
	pid_t pid;
...
	kill(pid, SIGTSTP);
	kill(pid, SIGTERM);
	kill(pid, SIGHUP);
	kill(pid, SIGKILL);


You can put sleep() between kill() functions just to give the program a little opportunity to stop itself.

To get the pid you can use getpid() and put this value somewhere where the killer process can take it.

Best regards
Iñaki

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