io_flush_buffer_sync 1037 io.c VALUE result = io_flush_buffer_sync(arg); io_flush_buffer_sync 1050 io.c return rb_thread_io_blocking_region(io_flush_buffer_sync, fptr, fptr->fd); io_flush_buffer_sync 4221 io.c if ((int)io_flush_buffer_sync(fptr) < 0 && NIL_P(err))