Re: [LIP] check instance of a running application

On Wed, Dec 24, 2003 at 04:45:43AM -0800, Ram wrote:
> For checking whether app is still running , I tried by
>  writing the  PID value to a file and later checked
> whether it exists or not. is there any other way to do
> this....

Your method is fine. On startup, log the PID in a file somewhere. To
check if the application is running or not, use kill().

from kill(2) manpage:

       If sig is 0, then no signal is sent, but error checking is still
       performed.

ie, something like:

if (kill (pid, 0) == 0) {
	printf ("PID %d is running\n", pid);
} else {
	if (errno == ESRCH) {
		printf ("PID %d is not running\n", pid);
	}
}

Binand

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