Hi,

I have a parent process (which is a package) with the following loop:

while (1) {
    $self->check_start();
    $self->check_run();

    # Sleep 1/10 second
    select(undef, undef, undef, 0.1);
}

[download]
This runs perfectly forever, without every stopping (check_start and check_run fork off child processes if needed to do some work). To clean up zombie processes, I added the following code:

$SIG{CHLD} = \&reaper;
while (1) {
    $self->check_start();
    $self->check_run();

    # Sleep 1/10 second
    select(undef, undef, undef, 0.1);
}

sub reaper {
    my $pid;
    do {
        $pid = waitpid(-1, &WNOHANG);
    } while ($pid > 0);
    $SIG{CHLD} = \&reaper;
}

[download]
Since then, my parent process is being killed every now and then (check_start and check_run were left unchanged)

Question 1: Does this have anything to do with the added code?
Question 2: How can I determine what killed to parent process, so I can fix this? (I already catch SIGTERM and SIGINT, which are not the signal killing the parent)

TIA!

Title change per author's request - dvergin 2002-04-23

In reply to Determining process cause of death by Marcello

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