Preparing Address Variables; Declaring Socket Address Variables - HP Rp3440-4 - 9000 - 0 MB RAM Programmer's Manual

Using UNIX Domain Stream Sockets

Preparing Address Variables

Preparing Address Variables
Before you begin to create a connection, establish the correct variables
and collect the information that you need to request a connection.
Your server process needs to:
• Declare socket address variables.
• Get the pathname (character string) for the service you want to
provide.
Your client process needs to:
• Declare socket address variables.
• Get the pathname (character string) for the service you want to use.
These activities are described next. Refer to the program example at the
end of this chapter to see how these activities work together.

Declaring Socket Address Variables

You need to declare a variable of type struct sockaddr_un to use for
socket addresses. For example, the following declarations are used in the
example client program:
struct sockaddr_un myaddr; /* for local socket address
struct sockaddr_un peeraddr; /* for peer socket address
sockaddr_un is a special case of sockaddr and is used with the
AF_UNIX address domain .
The sockaddr_un address structure consists of the following fields:
Field
short sun_family
u_char sun_path[92]
126
Description
Specifies the address family and should
always be set to AF_UNIX.
Specifies the pathname to which the
socket is bound or will be bound (e.g.
/tmp/mysocket).
*/
*/
Chapter 6