Practical C Programming

struct sockaddr_in structure

This structure references the socket's elements that are used for keeping addresses. The following are the built-in members of this structure:

struct sockaddr_in { short int sin_family; unsigned short int sin_port; struct in_addr sin_addr; unsigned char sin_zero[8];};

Here, we have the following:

• sin_family: Represents an address family. The valid options are AF_INET, AF_UNIX, AF_NS, and AF_IMPLINK. In most applications, the address family that's used is AF_INET.
• sin_port: Represents the 16-bit service port number.
• sin_addr: Represents a 32-bit IP address.
• sin_zero: This is not used and is usually set to NULL.

struct in_addr comprise one member, as follows:

struct in_addr {     unsigned long s_addr; };

Here, s_addr ...