Sockaddr casting example

gistfile1.c

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>

int main(void)
{
	struct sockaddr_in *server;
	server->sin_family = AF_INET;

	struct sockaddr *sa = (struct sockaddr *)server;

	if(sa->sa_family == AF_INET)
		printf("AF_INET\n");
	else
		printf("AF_UNSPEC\n");

	return 0;
}