FD_ISSET          429 include/ruby/win32.h #undef FD_ISSET
FD_ISSET          430 include/ruby/win32.h #define FD_ISSET(f, s)		rb_w32_fdisset(f, s)
FD_ISSET         2245 thread.c       #undef FD_ISSET
FD_ISSET         2250 thread.c       #define FD_ISSET(i, f)	rb_fd_isset(i, f)
FD_ISSET         2291 thread.c       #undef FD_ISSET
FD_ISSET         2296 thread.c       #define FD_ISSET(i, f)	rb_fd_isset(i, f)
FD_ISSET         2000 win32/win32.c  #undef FD_ISSET