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From: Jim Lucas on 10 Sep 2009 13:15
APseudoUtopia wrote:
> Hey list,
>
> I have a php cli script that listens on a UDP socket and, when data is
> sent to the socket, the script inserts it into a database. I'm using
> the real BSD socket functions, not fsock.
>
> The script runs socket_create(), then socket_bind(). Then it starts a
> while(TRUE) loop. Within the loop, it runs socket_recvfrom(). I have
> it running 24/7 inside a screen window.
>
> I'm curious as to the cpu/memory/etc usage of a while(true) loop. The
> `top` command shows that the process is in the sbwait state (the OS is
> FreeBSD). I'm contemplating adding a usleep or even a sleep inside to
> loop. Would this be beneficial? I'm not too sure of how the internals
> of PHP work in terms of loops and such.
>
> Thanks.
>


Here is something I wrote a few years ago. I still have this running on
my system today...

#!/usr/local/bin/php -q
<?php
error_reporting(E_ALL);
ini_set('display_errors', 'On');

// Set time limit to indefinite execution
set_time_limit(0);

// Set the ip and port we will listen on
define('LISTEN_IP', 'x.x.x.x'); // IP to listin on
define('LISTEN_PORT', 28000); // Port number to listen on
define('PACKET_SIZE', 512); // 512 bytes
define('SOCKET_TIMOUT', 2); // In Seconds

/* Open a server socket to port 1234 on localhost */
if ( $socket = @stream_socket_server('udp://'.LISTEN_IP.':'.LISTEN_PORT,
$errno, $errstr, STREAM_SERVER_BIND) ) {

echo "Running!!!\n";

while ( true ) {

// Output something to the screen to indicate that it is running
echo '.';

/* Get the exact same packet again, but remove it from the buffer
* this time.
*/
$buff = stream_socket_recvfrom($socket, PACKET_SIZE, 0, $remote_ip);

# Checking to see if someone is sending an invalid packet to my
# server
# Minimum packet size is 4 bytes
if ( strlen($buff) <= 4 ) {
continue;
}
print_r($buff);
}
fclose($socket);
}
echo "Done!!!\n";

###################END

Until recently, I was using screen also, but I have now switched over to
a new start/stop script. I run OpenBSD 4.3 & 4.5 on most of my boxes.

Once configured, this shell script can start/stop/status the given process.

I have been told that this does not start a /true/ daemon. But for me
it is close enough.

change the 4 variables at the top, just under the set -e line, and you
should have it.

Let me know if you have any problems.

#! /bin/ksh
#
# tms_daemon
#
# Starts a listening daemon that acts as a Tribes Master Server
#
# Author: Jim Lucas <jlucas(a)cmsws.com>
#
# Version: 0.0.1
#

set -e

DESC="Name of service"
DAEMON=/path/to/file.php
PIDFILE=/var/run/<NAME>.pid
SCRIPTNAME=tms_daemon

# Gracefully exit if the package has been removed.
test -x $DAEMON || exit 0

#
# Function that starts the daemon/service.
#
d_start() {
if [ -f $PIDFILE ]; then
echo "$DESC already running: PID# `cat $PIDFILE`"
exit 1
else
echo -n "Starting $DESC"
nohup $DAEMON 2>&1 1>/dev/null &
sleep 0.5
ps aux | grep $DAEMON | grep -v grep | awk -F' ' '{print $2} ' >
$PIDFILE
echo ". [`cat $PIDFILE`]"
fi
}

#
# Function that stops the daemon/service.
#
d_stop() {
if [ -f $PIDFILE ]; then
echo -n "Stopping $DESC"
kill `cat $PIDFILE`
rm $PIDFILE
echo "."
else
echo "$DESC is not running"
exit 1
fi
}

case "$1" in
start)
d_start
;;
stop)
d_stop
;;
status)
if [ -f $PIDFILE ]; then
echo "$DESC is running: PID# `cat $PIDFILE`"
else
echo "$DESC is not running"
fi
;;
cleanup)
PID="`ps aux | grep $DAEMON | grep -v grep | awk -F' ' '{print $2}'`"
kill $PID
rm $PIDFILE
;;
restart|force-reload)
d_stop
sleep 0.5
d_start
;;
*)
echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
exit 1
;;
esac

exit 0

##############END


Jim Lucas

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