AF_INET PF_INET difference - socket programming

[brunoyalgi]

In socket programming in C++ WIN32 / UNIX / LINUX , we use AF_INET for Address family and PF_NET for protocol family.

socket( AF_INET, SOCK_STREAM, IPPROTO_IP )
serv_addr.sin_f amily = AF_INET;

socket( PF_INET, SOCK_STREAM, IPPROTO_IP )
serv_addr.sin_f amily = PF_INET;

I would like to know where we need to use AF_NET & PF_NET respectively?

[ashitpro]

AF_* stands for Address Family
PF_* stands for Protocol Family

BSD man page promises:
"The protocol family generally is the same as the address family", and subsequent standards use AF_* everywhere.

Even linux/socket.h specifies as

#define PF_INET AF_INET

Yet, we can say

int socket(int family,int type,int prototype);

Here,family identifies family by address or protocol.Addres s family identifies a collection of protocol with the SAME ADDRESS FORMAT,while protocol family identifies a collection of protocol having SAME ARCHITECTURE.