I believe (not 100% sure but seems to work on my Debian with 3.10.3 kernel) that in /proc/net/tcp the sockets in listen-state have a state-code of "0A" and for those the receive-queue entry holds the number of pending (i.e. not yet accepted) connections.

This is how such an entry looks like:

1: 00000000:1A0B 00000000:0000 0A 00000000:00000002 00:00000000 00000000  1000        0 1117932 1 ffff880031e70040 100 0 0 10 0

The fist column is the local address (here a server-socket listening on port 6667) the next the remote address, then the state (here 0A for listening) then the transmit and receive queue-lengths.

Here my server has 2 connections pending.

So using the address your server listens you should be able to extract the information you need from /proc/net/tcp.

Maybe Linux::Proc::Net::TCP can help here, but I have never used it.

In reply to Re^3: How to count the number of pending clients in socket queue? by morgon
in thread How to count the number of pending clients in socket queue? by mrbark

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.