$Bill Luebkert <> wrote:
> Barry Brevik wrote:
>
>> I've created a server application that listens on a port. It works
>> great. While it is running, it prints diagnostic messages to the
>> screen. It seems that as soon as the app does an accept():
>>
>> $client_addr = accept(CLIENT, SERVER);
>>
>> ...for example, print() statements to STDOUT do not show on the
>> screen until the app terminates.
>>
>> I discovered that if I do:
>>
>> print STDERR "my message\n";
>>
>> ...I get the result I am looking for.
>>
>> My question is: I just want to understand this. Why do I have to
>> write to STDERR after opening a socket? Is it maybe a bad idea to do
>> this??
>
> Try unbuffering your I/O to STDOUT. $| = 1; (make sure STDOUT is
> selected at the time - it's the default if you haven't done a select
> yet)
Perhaps, but that hasn't been a problem in my experience of socket i/o.
There may of course be some other reason. If Barry could provide a
small, self contained script that demonstrates the problem it might be a
lot easier to see. For example, the following simple server script
doesn't have the problem described, at least when I run it.
---------------------------------------------
use strict;
use warnings;
use IO::Socket::INET;
my $l = IO::Socket::INET->new(LocalPort => 9876,
Listen => 1,
ReuseAddr => 1);
defined $l or die "Failed to create listener: $!\n";
print "Listening\n";
while (my $s = $l->accept) {
my $peer = $s->peerhost;
print "Accepted connection from $peer\n";
while (<$s>) {
chomp;
print "Received: $_\n";
}
close $s;
print "Socket closed - listening again\n";
}
---------------------------------------------
HTH
--
Brian Raven
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