What vec() does is construct a bit vector, in this case related to the fileno of the client socket. Every filehandle on the OS has an actual file number. Consider: 

print fileno(STDIN), $", fileno(STDOUT), $", fileno(STDERR);
__DATA__
0 1 2

[download]

So STDIN is fileno 0, etc. When you open a file or a socket a unique fileno that identifies it is stored by the OS in the file table. So what the first vec is doing is generating a bitmask in $bits1 that represents that. What 4 arg select does is return values for handles that can be READ, WRITTEN and HAVE ERRORS. It waits the specified time and then returns. It returns the data in a bitmap type format. We use vec again to see if the bit that corresponds to the filehandle we are interested in has been set in the returned value. (vec returns true if it is set, false if not).

I don't know what you mean about how you get the ip address of the source - it is there in the code and being printed?

cheers

tachyon

In reply to Re^3: IO::Socket::INET -- Jettero verses non-blocking in windows by tachyon
in thread IO::Socket::INET -- jettero verses non-blocking in windows by jettero

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.