in reply to Logging out

Update

Well, the following snippet of code is pretty ugly, but it seems to work. It is executed by the server program in response to a command from the client via SOAP. 

my @ps = `ps -ef`;
my @pid = (split(/ +/, (grep(/login -- mrc/, @ps))[0]))[1];
my @kill;
while (1) {
  last unless @pid = grep {$_ > 1} @pid;
  push @kill, @pid;
  my $pidlist = join('|', @pid);
  last unless @pid = grep(/\s+[\d]+\s+($pidlist) /, @ps);
  @pid = map {(split(/\s+/, $_))[1]} @pid;
}
kill 'TERM', @kill

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What this does is get a list of all running processes, finds one named "login -- mrc", then goes through the list looking for all its children, children's children, etc. Once it's done this, it kills them all. Ugh.

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Re: Re: Logging out
by rob_au (Abbot) on Oct 28, 2001 at 10:09 UTC
    As I'm a great proponent of implementing in Perl rather than relying on external programs, I came up with the following more generic code which is a bit cleaner in that it doesn't depend on the external execution of ps : 

    sub killchd ($;$) {
    use Proc::ProcessTable;
    my $sig = ($_[1] =~ /^\-?\d+$/) ? $_[1] : 0;
    my $proc = Proc::ProcessTable->new;
    my %fields = map { $_ => 1 } $proc->fields;
    return undef unless exists $fields{'ppid'};
    foreach (@{$proc->table}) {
        kill $sig, $_->pid if ($_->ppid == $_[0]);
    };
    kill $sig, $_[0];
};

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    This subroutine takes two arguments, the parent process ID and the numeric signal to pass to the processes (which would be 9 if you wanted to issue a -TERM). Using Proc::Process you could find the process ID of the process login -- mrc with something similar to the following : 

    my $proc = Proc::ProcessTable->new;
my @ps = map { $_->pid if ($_->cmndline =~ /login -- mrc/) } @{$proc->
+table};
&killchd($_, 9) foreach @ps;

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    Ooohhh, Rob no beer function well without!

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[d/l]
[select]
      Yes, I like that much better. Thanks!
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