The following works for me, without timeouts, on both Linux and Windows XP SP2 and ActiveState perl 5.10.0:
use strict;
use warnings;
use Socket;
my $host = 'localhost';
my $port = shift || '8888';
my $timeout = 30;
my $result = portAlive();
print "result = $result\n";
sub portAlive {
my $proto = getprotobyname('tcp');
my $iaddr = inet_aton($host);
my $paddr = sockaddr_in($port, $iaddr);
socket(SOCKET, PF_INET, SOCK_STREAM, $proto) || warn "socket: $!";
eval {
local $SIG{ALRM} = sub { die "timeout" };
alarm($timeout);
connect(SOCKET, $paddr) || error();
alarm(0);
};
if ($@) {
close SOCKET || warn "close: $!";
# print "$hostname is NOT listening on tcp port $portnumber.\n";
return 0;
}
else {
close SOCKET || warn "close: $!";
# print "$hostname is listening on tcp port $portnumber.\n";
return 1;
}
}
The code you posted is incomplete. Is it possible that your problem is elsewhere in your code?
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