Writing The Client Process; Creating A Socket - HP Rp3440-4 - 9000 - 0 MB RAM Programmer's Manual

Using Internet Stream Sockets

Writing the Client Process

Writing the Client Process
This section explains the calls your client process must make to connect
with and be served by a server process.

Creating a Socket

The client process must call socket to create a communication endpoint.
socket and its parameters are described in the following table.
Include files:
#include <sys/types.h>
#include <sys/socket.h>
System call:
s = socket(af, type, protocol)
int af, type, protocol;
Parameter Description of Contents
af address family
type socket type
protocol underlying protocol to be
used
Function result: socket number (HP-UX file descriptor), –1 if failure
occurs.
Example:
s = socket (AF_INET, SOCK_STREAM, 0);
The socket number returned is the socket descriptor for the newly
created socket. This number is an HP-UX file descriptor and can be used
for reading, writing or any standard file system calls after a BSD Sockets
connection is established. A socket descriptor is treated like a file
descriptor for an open file.
When to Create Sockets
The client process should create sockets before requesting a connection.
Refer to the socket(2) man page for more information on socket.
40
INPUT Value
AF_INET
SOCK_STREAM
0 (default) or value
returned by
getprotobyname
Chapter 2