I've been working on a very simple server to learn how things work and I'm having one major problem that I can't get past. If I run more that one client at a time and either client is killed then the server won't accept any more connections until all clients are killed.

For example: client 1 connects, client 2 connects, client 2 is killed, client 3 tries to connect but hangs until client 1 is killed.

The server code is below:

#!/usr/bin/perl 
use IO::Socket;
use Sys::Hostname;
use POSIX qw(:sys_wait_h);
#testserver
$version=".00";
$debug=0;
$myip='192.168.0.2';
$true=1;


#---------------------------------- BetQ.d Main ----------------------
+--------------------
&do_socket;
#---------------------------------- BetQ.d Main ----------------------
+--------------------


#---------------------------------- Subroutines ----------------------
+--------------------

sub S_print {
        print $new_sock (@_);
}


sub do_socket {
        $SIG{CHLD} = \&REAP;
        $sock = new IO::Socket::INET(
                   LocalHost => $myip,
                   LocalPort => 8721,
                   Proto     => 'tcp',
                   Listen    => SOMAXCONN,
                   Reuse     => 1);
        $sock or die "no socket :$!";
        STDOUT->autoflush(1);
        while (($new_sock, $c_addr) = $sock->accept()) {
                ($client_port, $c_ip) = sockaddr_in($c_addr);
                $client_ipnum = inet_ntoa($c_ip);
                $client_host = gethostbyaddr($c_ip, AF_INET);
        # execute a fork, if this is
        # the parent, its work is done,
        # go straight to continue
                $i=0;
                $done=0;
                $betsend=0;
                print "[$client_ipnum] $client_host connected\n";
                next if $kid = fork;
                die "fork: $!" unless defined $kid;
        # child now...
        # close the server - not needed
                #print "closing sock\n";
                close $sock;
                #print "Forked child printing CMDSTART to client\n";
                $date=`date`;
                print $new_sock "[$client_ipnum] $client_host $date co
+nnection attempt logged\n";
                print $new_sock "This is a private server.\n";
                print $new_sock "username:\n";
                if (defined($lineread = <$new_sock>)) {
                        print "un received: $lineread";
                        print $new_sock "$lineread";
                        print $new_sock "password:\n";
                }
                if (defined($lineread = <$new_sock>)) {
                        print "pw received: $lineread";
                        print $new_sock "$lineread";
                }
                if ($lineread eq "start\n"){
                        print $new_sock "Accepted\n";
                        $first=1;
                        &Send_Bets;
                }else{
                        sleep(5);
                        print $new_sock "Denied and logged\n";
                }
                print "lineread is -->$lineread<--\n";
                print "Breaking connection to [$client_ipnum] $client_
+host\n";
                exit;
        } continue {
        # parent closes the client since
        # it is not needed
                print "closing new sock\n";
                close $new_sock;
        }
        print "IN 7\n";
}

sub REAP {
        print "reaping\n";
    1 until (-1 == waitpid(-1, WNOHANG));
    $SIG{CHLD} = \&REAP;
}

sub Send_Bets {
        $done=0;
        while(!$done){
                if ($first || defined($lineread = <$new_sock>)) {
                        print "startcmd is $lineread";
                        $first=0;
                        for ($f=0;$f<=10;$f++) {
                                print "sending: $f";
                                &S_print (" sent $f\n");
                        }
                        print "sending: EOF\n";
                        &S_print ("EOF\n");
                }
                if ($lineread ne "start\n"){
                        $done=$true;
                }
        }
}
[download]

edited: Mon Nov 18 15:30:18 2002 by jeffa - s/pre/code/g

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