Hello All! I am having problems with signals using perl 5.8.0 on win2K. Probably has to do with my inexperience with them. My humble script is acting as a ping server and uses the Net::ping module. I fork a child that starts a ping. When commanded to do so the parent will kill the child. Initally I was sending the KILL (9) to the child but this consumed memory so I switched to TERM. The problem is that the child does not always catch the signal. The problem seems to mostly exist when I am pinging an IP address that does not respond. My assumption is that the program is in the net:ping module waiting for a timeout when the signal is sent and is thus missed, but that is merely a guess. The acutal ping process is here: 
sub ProcessPing 
{
    my ($Id, $IpAddr, $Command) = @_;
    $pingobject = Net::Ping->new(icmp,1);     
    if ($child_pid = fork())
    {
        #We must be the parent process
        return $child_pid;
    }
    
    elsif (defined $child_pid) 
    {   # We must be the child process
        $SIG{TERM} = \&int_handler ; #Since we are the child set up a 
                                     #Signal handler. TERM was chosen
                                     #to try and eliminate memory cons
+umption.
        while (1) 
        {
            if ($pingobject->ping($IpAddr)) 
            {
                print "Ping successfull to $IpAddr for Id $Id\n";
                sleep 1;
            }
            else 
            {
                print "Ping timeout occured on $IpAddr for Id $Id\n";
            }
        }
    }
}

[download]
The interrupt handler is: 
sub int_handler
{        #Only called by the child.
        print "Caught the signal!!!!!!!!!!!!!!\n";
        my $signal = shift;
        die "Caught the signal, Exiting!!!\n";
}

[download]
And the kill command used in another part of the program is: kill ("TERM", $child_pid_to_kill); When the signal is missed I do not see the output from the debug statement: print "Caught the signal!!!!!!!!!!!!!!\n";

Another interesting tidbit is if I switch the signal used to KILL the child dies everytime! Any ideas? Thanks

In reply to Child not Consistantly Terminating by sdl3

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