Thank you Arguile.

I did have some trouble with buffering, but not in these areas. STDIN and STDOUT are autoflushed when connected to an interactive terminal, but not when redirected. Because of this, my code worked fine when run directly, but hung miserably when run under djb's tcpserver. i finally added: 

# turn on autoflush for STDIN and STDOUT
select STDIN;
$|=1;
select STDOUT;
$|=1;
select STDERR;

[download]

to deal with that.

Likewise in the log file, I'm doing much the same thing, except I'm not keeping the filehandle when not in use. 

sub logger {
  # set up a file handle for a log file.
  open LOG, ">>$log_file" or die("Could not open log file for appendin
+g.");
  select LOG;
  $|=1;
  select STDERR;
  print LOG "weldd $$: ", scalar(localtime), " @_\n";
  close LOG;
}

[download]

Alas, the IO::Socket stuff shouldn't require autoflushing, per perldoc: 

perldoc IO::Socket
...
NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE

As of VERSION 1.18 all IO::Socket objects have aut-
oflush turned on by default. This was not the case
with earlier releases.

NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE
...

The uptake of this is that, while I did have problems with buffering, I don't think it's the current problem :(

ginseng

In reply to Re: Re: Flaky Server (IO::Socket and IO::Select Question) by ginseng
in thread Flaky Server (IO::Socket and IO::Select Question) by ginseng

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.