Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

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

Replies are listed 'Best First'.
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)

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://806070]
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others surveying the Monastery: (6)
As of 2018-03-19 19:08 GMT
Find Nodes?
    Voting Booth?
    When I think of a mole I think of:

    Results (246 votes). Check out past polls.