BSD Sockets Interface Programmer's Guide

48 Chapter 2

Using Internet Stream Sockets

Example Using Internet Stream Sockets

NOTE These programs are provided as examples only of stream socket usage

and are not Hewlett-Packard supported products.

These program examples demonstrate how to set up and use internet

stream sockets. These sample programs are in the

/usr/lib/demos/networking/socket directory. The client program

is intended to run in conjunction with the server program. The client

program requests a service called example from the server program.

The server process receives requests from the remote client process,

handles the request and returns the results to the client process. Note

that the server:

• Uses the wildcard address for the listen socket.

• Uses the ntohs address conversion call to show porting to a host that

requires it.

• Uses the SO_LINGER option for a graceful disconnect.

The client process creates a connection, sends requests to the server

process and receives the results from the server process. Note that the

client:

• Uses shutdown to indicate that it is done sending requests.

• Uses getsockname to see what socket address was assigned to the

local socket by the host.

• Uses the ntohs address conversion call to show porting to a host that

requires it.

Before you run the example programs, make the following entry in the

two host's /etc/services ﬁles:

example 22375/tcp

The source code for these two programs follows

* S E R V . T C P

* This is an example program that demonstrates the use of stream

* sockets as a BSD Sockets mechanism. This contains the server,

* and is intended to operate in conjunction with the client

* program found in client.tcp. Together, these two programs