Senthil,

I don't think your gethost_addrinfo() function will work. On a v6-
enabled machine, it will only return v6 or v4 names. Shouldn't it 
return both (since a machine could have both v4 and v6 addresses)? For 
example, on my machine, I have the following addresses for 
"localhost": ::1, fe80::1%lo0, 127.0.0.1.

Also, why is the AI_CANONNAME flag set? The canonname field isn't used. 
And you only appear to take the last IP address returned (sa[0]). 
Shouldn't you return all the addresses?