Article 3181 of comp.lang.perl:
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From:
[email protected] (Joachim Huober)
Subject: Re: socket SO_KEEPALIVE example needed
Message-ID: <
[email protected]>
Keywords: perl socket IPC KEEPALIVE tcp
Sender: huober_j@oracle (Joachim Huober)
Organization: Universitaet Ulm
References: <
[email protected]>
Date: Fri, 4 Jun 1993 09:34:30 GMT
Lines: 63
Sorry but I can't mail to '
[email protected]' (Returned mail: Host unknown)
so I post here:
The following works fine for me:
#! /usr/bin/perl
require 'sys/socket.ph';
require 'sys/wait.ph';
($server,$port) = @ARGV;
$port = 2350 unless $port;
$server = 'echo server not specified' unless $server;
$SIG{'CHLD'} = 'childhdl';
sub childhdl
{
local($pid) = waitpid(-1,&WNOHANG);
}
$socketaddr = 'S n a4 x8';
(($name, $aliases, $proto) = getprotobyname('tcp')) || die;
((($name, $aliases, $port) = getservbyname($port, 'tcp')) || die)
unless $port =~ /^\d+$/;
$this = pack($socketaddr, &AF_INET, $port, "\0\0\0\0");
select(NS); $| = 1; select(stdout);
socket(S, &PF_INET, &SOCK_STREAM, $proto) || die "socket: $!";
bind(S, $this) || die "bind: $!";
listen(S, 5) || die "listen: $!";
select(S); $| = 1; select(STDOUT);
for (;;) {
until (defined($addr = accept(NS,S)))
{}
if ($child = fork)
{
close(NS);
}
elsif (defined($child))
{
setsockopt(NS,&SOL_SOCKET,&SO_KEEPALIVE,undef,undef) || warn "setsockopt: $!";
open(STDIN,"<&NS") || die "open: $!";
open(STDOUT,">&NS") || die "open: $!";
exec($server) || die "exec $!";
close(NS);
exit;
}
else
{
warn "Can't fork $!";
close(NS);
}
}
Hope this helps :-)
Yours Joachim
