rb_w32_setsockopt  227 include/ruby/win32.h extern int    WSAAPI rb_w32_setsockopt(int, int, int, const char *, int);
rb_w32_setsockopt  473 include/ruby/win32.h #define setsockopt(s, v, n, o, l) rb_w32_setsockopt(s, v, n, o, l)