getprotobyname ¶POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/getprotobyname.html
Gnulib module: —
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
<winsock2.h> instead of <netdb.h>
on some platforms:
mingw, MSVC 14.