MODE_TO_LOAD     1881 ruby.c         # define MODE_TO_LOAD (O_RDONLY | O_NONBLOCK)
MODE_TO_LOAD     1883 ruby.c         # define MODE_TO_LOAD (O_RDONLY | O_NDELAY)
MODE_TO_LOAD     1885 ruby.c         # define MODE_TO_LOAD (O_RDONLY)