Your server is only reading one line from the client. If your client sends multiple lines, it's possible that the server has closed the socket before the client finishes sending all of his information. In this case, the attempt to print to the socket is probably getting a SIGPIPE aborting your client before it even gets a chance to read the socket. By adding the sleep() call, you have given the client more time to finish writing all of the extra data to the socket and it can complete successfully.

Try adding $SIG{PIPE} = sub { print "SIGPIPE\n"; }; to your client code somewhere near the top. If 'SIGPIPE' ever gets printed at the client end, then what I described above is happening.

90% of every Perl application is already written. ⇒
dragonchild

In reply to Re: IO::Socket::UNIX close() discards data when called "too soon"? by pfaut
in thread IO::Socket::UNIX close() discards data when called "too soon"? by ddzeko

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.