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Re: Identifying whether a process is running

by snoopy (Deacon)
on Nov 09, 2009 at 23:15 UTC ( #806070=note: print w/ replies, xml ) Need Help??


in reply to Identifying whether a process is running

If you already know the process id(s), and own the processes, the kill builtin function might be of use.

From the doco:

   kill SIGNAL, LIST
   .... 
        $cnt = kill 1, $child1, $child2
        kill 9, @goners;

    If SIGNAL is zero, no signal is sent to the process, but the
    kill(2) system call will check whether it's possible to send
    a signal to it (that means, to be brief, that the process is
    owned by the same user, or we are the super user).  This is
    a useful way to check that a child process is alive.


Comment on Re: Identifying whether a process is running
Re^2: Identifying whether a process is running
by astroboy (Chaplain) on Nov 10, 2009 at 20:51 UTC
    Alas, this didn't work for me. I'm trying to see from a web page whether a daemon that should be running as root is actually there. The apache user can't issue a kill 0 to root's process (well it can, but it doesn't report the result correctly)

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