inet_ntop
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/inet_ntop.html
Gnulib module: inet_ntop
Portability problems fixed by Gnulib:
<netdb.h> instead of <arpa/inet.h>
on some platforms:
NonStop Kernel.
<ws2tcpip.h>, with a POSIX incompatible
declaration, on some platforms:
MSVC 9 on Windows >= Vista.
Portability problems not fixed by Gnulib:
size_t instead of
socklen_t on some platforms:
OSF/1 5.1, Solaris 10.