FreeBSD listen() again

[3APA3A () SECURITY NNOV RU (3APA3A)]

Hello vulN-DEV@,

 I wasn't right in defining the problem for backlog in listen()

  as it was correctly pointed by Sebastian <scut () nb in-berlin de>:

-=-=-=-=-
For some unknown reasons berkeley derived implementations multiply backlog
with 1.5. (backlog = 5 will turn to 8 for example).
-=-=-=-=-

  It seems real queue length is counted as
     backlog + (backlog+1)>>1

  that's  why  listen(sock,  1)  will never work as it should. It will
  allow  to  establish  2 connections. It's for both FreeBSD 2.2.x and
  3.x, so the problem is even deeper.

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