cnbell|cnbell cnclose|cnclose cnflush|cnflush cngetc|cngetc cngetsn|cngetsn cnhalt|cnhalt cnioctl|cnioctl cnkqfilter|cnkqfilter cnopen|cnopen cnpoll|cnpoll cnpollc|cnpollc cnputc|cnputc cnread|cnread cnwrite|cnwrite cn_destroy_magic|cn_destroy_magic cn_get_magic|cn_get_magic cn_init_magic|cn_init_magic cn_set_magic|cn_set_magic