To demonstrate the getaddrinfo() and getnameinfo() functions, we will implement a short program. This program takes a name or IP address for its only argument. It then uses getaddrinfo() to resolve that name or that IP address into an address structure, and the program prints that IP address using getnameinfo() for the text conversion. If multiple addresses are associated with a name, it prints each of them. It also indicates any errors.
To begin with, we need to include our required header for this chapter. We also define AI_ALL for systems that are missing it. The code for this is as follows:
/*lookup.c*/#include "chap05.h"#ifndef AI_ALL#define AI_ALL 0x0100#endi
We can then begin the main() function and check ...
