$Bill Luebkert <> wrote:
> Brian Raven wrote:
>
>> Well the example in 'perldoc IO::Select' seems to provide a basic
>> skeleton that can be fleshed out. However, as I am feeling generous
>> today for some reason, as well as suggesting that you RTFM, I have
>> fleshed it out a little.
>>
>> ----------------------------------------------------
>> use strict;
>> use warnings;
>> use IO::Select;
>> use IO::Socket;
>> my $lsn = new IO::Socket::INET(Listen => 1, LocalPort => 9876,
>> ReuseAddr => 1); my $sel = new IO::Select( $lsn ); while (my @ready
>> = $sel->can_read) { foreach my $fh (@ready) {
>> if ($fh == $lsn) {
>> my $new = $lsn->accept;
>> $sel->add($new);
>> my $host = $new->peerhost;
>> print "[Accepting connection from $host]\n";
>> } else {
>> my $line = <$fh>;
>
> I would normally not be doing <> IO on a socket. sysread is the
> better way to go IMO.
>
>> $line =~ s/\s+$//;
>> if ($line =~ /^quit/i) {
>> my $host = $fh->peerhost;
>> $sel->remove($fh);
>> $fh->close;
>> print "Connection from $host terminated\n";
>> }
>> else {
>> print $fh->peerhost, " said '$line'\n";
>> print $fh "You said: '$line'\n";
>
> This echo print can lock you up. can_write should be used to
> determine if write is prudent. This is why a Qing system is probably
> the way to go for multi-client single server setup.
>
>> }
>> }
>> }
>> }
Valid points, but as I said I was just fleshing out an existing example.
I was doing as little work as possible to generate a working, if
simplistic, demo. In general, for a single process, single threaded,
multi client server, then select, non-blocking i/o, sysread and syswrite
would be preferred for a more bomb proof solution. It also need a lot
more error checking, etc.
Also, it might be simpler, depending on requirements and design, to just
call syswrite instead of can_write. If using non-blocking i/o the
syswrite will either return EWOULDBLOCK or indicate a partial write if
tcp buffers are full. But yes you would need some mechanism such as a
queue to retain unsent data to try again later, whichever method you
chose.
HTH
--
Brian Raven
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