rb_fd_select      321 include/ruby/intern.h int rb_fd_select(int, rb_fdset_t *, rb_fdset_t *, rb_fdset_t *, struct timeval *);
rb_fd_select     10132 io.c                   return rb_fd_select(n, rfds, wfds, efds, timeout);
rb_fd_select     10166 io.c                   ret = rb_fd_select(rb_fd_max(&stp->fds), NULL, &stp->fds, NULL, NULL);
rb_fd_select     1092 thread_pthread.c     return rb_fd_select(n, readfds, writefds, exceptfds, timeout);