FD_ISSET          612 include/ruby/win32.h #undef FD_ISSET
FD_ISSET          613 include/ruby/win32.h #define FD_ISSET(f, s)		rb_w32_fdisset(f, s)
FD_ISSET         3562 thread.c       #undef FD_ISSET
FD_ISSET         3567 thread.c       #define FD_ISSET(i, f)	rb_fd_isset((i), (f))
FD_ISSET         3615 thread.c       #undef FD_ISSET
FD_ISSET         3620 thread.c       #define FD_ISSET(i, f)	rb_fd_isset((i), (f))
FD_ISSET         2680 win32/win32.c  #undef FD_ISSET