Re: ldirectord fork a new daemon?

Horms <horms <at> verge.net.au> writes:

> 
> On Tue, Aug 30, 2005 at 08:57:33AM +0000, Eric Chan wrote:
> > Hi, 
> > 
> > We have modified the /usr/sbin/ldirectord perl script. The aim is to add a 
> > check_process function using rsh to check for existence of remote process.
> > 
> > For the ldirectord, there is the below procedure
> > 
> > sub ld_daemon
> > 
> > This seems to cause our system call to rsh to fork a new daemon. 
> > 
> > system("rsh 192.168.0.111 ps -ef|grep java");
> > 
> > As a result, there are many time_wait for the port 514 (rsh listen port) on 
the 
> > ldirectord side. [netstat -na|grep 514 show many time_wait]
> > 
> > Is there any ways to solve this problem? We don't want to have so much 
> > time_wait. Thx.
> > 
> > Best regards,
> 
> ld_deaemon() is run as part of ldirectord's initilalisation sequence
> to detatch it from the terminal, and do other things that are
> appropirate for a deamon. Once ldirectord is up and running,
> it should not have any effect on child processes, unless
> they expect to be attached to a terminal (perhaps rsh does).
> 
> On a related note, if you want to call system() from inside
> ldirectord I recommend using system_wrapper()
> 
Dear Horms,

Thanks for your reply.I have carried out another test using a simple perl 
script as below

#!/usr/bin/perl
while(1){
 system("rsh pct62 /tmp/alivetcp");
 sleep 1;
}

There is no time wait problem. It seems that the problem is not related to the 
rsh.

I have put the above perl script within the ldirectord perl script as below and 
the time wait problem occur.


if ($opt_h) {
	&system_wrapper("/usr/bin/perldoc -U $LDIRECTORD");
} else {
	# There is a memory leak in perl's socket code when
	# the default IO layer is used. So use "perlio" unless
	# something else has been explicitly set.
	# http://archive.develooper.com/[email protected]/msg85468.html
	unless(defined($ENV{'PERLIO'})) {
		$ENV{'PERLIO'} = "perlio";
		exec_wrapper($0, @OLD_ARGV);
	}

	$initializing = 1;
	ld_init();
	ld_setup();
	ld_start();
	ld_cmd_children("start", %LD_INSTANCE);
	$initializing = 0;
	#ld_main();
        while(1){
           system("rsh pct62 /tmp/alivetcp");
           sleep 1;
        }
}


However, once I have comment the call to the &ld_daemon() within ld_init(), the 
problem disappear.


Best regards,
Eric








-- 
Ultra Monkey - http://www.ultramonkey.org/
To UNSUBSCRIBE, email to [email protected], with a body:
unsubscribe ultramonkey-users [email protected]
where "[email protected]" is YOUR email address.