Re: NetServer::Generic -- welcome message ??
- From: anno4000@xxxxxxxxxxxxxxxxxxxxxxx (Anno Siegel)
- Date: 30 Mar 2006 12:54:27 GMT
Babacio <babacio@xxxxxxx> wrote in comp.lang.perl.misc:
More precisely, I would appreciate any suggestion of a simple
way to run a forked/preforked tcp server, that would behave
like the following one. (Any comment on the code is welcome
as well).
use IO::Socket;
my $server = IO::Socket::INET->new(LocalPort => 9101,
Type => SOCK_STREAM,
Reuse => 1,
Listen => 10 )
or die "$@\n";
while (my $client = $server->accept()) {
print $client "Welcome! Say 'quit' to leave.\n";
Why did you put this interaction outside the client loop?
while(1) {
my $x = <$client>;
last if $x =~ /^quit/i;
I'd put that last, so the "quit" interaction is logged as well.
$x =~ s/[\r|\n]//g;
print $client "You said $x!\n";
}
}
close($server);
To make a plain forked server, there isn't much to add. Just run
the client loop ("while ( 1 )...") in a forked process and exit after
the loop. Add a sigchld handler against zombies and error checking
and you're basically done. This is the loop (marginally tested)
$SIG{ CHLD} = 'IGNORE'; # good enough on most systems
while (my $client = $server->accept()) {
if ( my $pid = fork ) {
# parent does nothing here
} else {
print $client "Welcome! Say 'quit' to leave.\n";
die "can't fork" unless defined $pid;
while(1) {
my $x = <$client>;
$x =~ s/[\r|\n]//g;
print $client "(pid $$) You said $x!\n";
last if $x =~ /^quit/i;
}
exit;
}
}
If you need the ability for every client process to shut down the main
server, kill() the main process through an appropriate signal from the
child.
Anno
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