Re: Communicating with a servlet using NIO?

Lew <>
Fri, 07 Dec 2007 20:47:53 -0500
George Neuner wrote:

On Thu, 06 Dec 2007 05:42:28 GMT, Esmond Pitt
<> wrote:

George Neuner wrote:

constantly in a busy system. Not only do most programs let the system
select outgoing ports, but the system also selects the incoming ports
for most server programs.

This is not correct. TCP/IP uses the same port number as the listening
port for incoming connections.

When a connection is made to a TCP
listen port, the system selects a free port and transfers the incoming
connection to it - all communication beyond the initial connection by
the client takes place through that randomly assigned port.

This is not correct. See above.

Sorry, but it is you who are wrong. Look in your help or man pages
for the description of the "accept" call.

You may be thinking that sockets can be shared and multiplexed - which
is true - but that's not how the accept call works.

<QUOTE> from FreeBSD man page accept(2)
Accept removes the next connection request from the queue (or waits
until a connection request arrives), creates a new socket for the
request, and returns the descriptor for the new socket. Accept only
applies to stream sockets (e.g., those used with TCP).

All of these references say "creates a new socket", none say "assigns a new port".


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