diff options
Diffstat (limited to 'sys/kern/tty_conf.c')
| -rw-r--r-- | sys/kern/tty_conf.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/sys/kern/tty_conf.c b/sys/kern/tty_conf.c new file mode 100644 index 0000000..0609dc9 --- /dev/null +++ b/sys/kern/tty_conf.c @@ -0,0 +1,210 @@ +/*- + * Copyright (c) 1982, 1986, 1991, 1993 + * The Regents of the University of California. All rights reserved. + * (c) UNIX System Laboratories, Inc. + * All or some portions of this file are derived from material licensed + * to the University of California by American Telephone and Telegraph + * Co. or Unix System Laboratories, Inc. and are reproduced herein with + * the permission of UNIX System Laboratories, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)tty_conf.c 8.4 (Berkeley) 1/21/94 + * $FreeBSD$ + */ + +#include "opt_compat.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/tty.h> +#include <sys/conf.h> + +#ifndef MAXLDISC +#define MAXLDISC 9 +#endif + +static l_open_t l_noopen; +static l_close_t l_noclose; +static l_rint_t l_norint; +static l_start_t l_nostart; + +/* + * XXX it probably doesn't matter what the entries other than the l_open + * entry are here. The l_nullioctl and ttymodem entries still look fishy. + * Reconsider the removal of nullmodem anyway. It was too much like + * ttymodem, but a completely null version might be useful. + */ +#define NODISC(n) \ + { l_noopen, l_noclose, l_noread, l_nowrite, \ + l_nullioctl, l_norint, l_nostart, ttymodem } + +struct linesw linesw[MAXLDISC] = +{ + /* 0- termios */ + { ttyopen, ttylclose, ttread, ttwrite, + l_nullioctl, ttyinput, ttstart, ttymodem }, + NODISC(1), /* 1- defunct */ + /* 2- NTTYDISC */ +#ifdef COMPAT_43 + { ttyopen, ttylclose, ttread, ttwrite, + l_nullioctl, ttyinput, ttstart, ttymodem }, +#else + NODISC(2), +#endif + NODISC(3), /* loadable */ + NODISC(4), /* SLIPDISC */ + NODISC(5), /* PPPDISC */ + NODISC(6), /* NETGRAPHDISC */ + NODISC(7), /* loadable */ + NODISC(8), /* loadable */ +}; + +int nlinesw = sizeof (linesw) / sizeof (linesw[0]); + +static struct linesw nodisc = NODISC(0); + +#define LOADABLE_LDISC 7 +/* + * ldisc_register: Register a line discipline. + * + * discipline: Index for discipline to load, or LDISC_LOAD for us to choose. + * linesw_p: Pointer to linesw_p. + * + * Returns: Index used or -1 on failure. + */ +int +ldisc_register(discipline, linesw_p) + int discipline; + struct linesw *linesw_p; +{ + int slot = -1; + + if (discipline == LDISC_LOAD) { + int i; + for (i = LOADABLE_LDISC; i < MAXLDISC; i++) + if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) { + slot = i; + } + } + else if (discipline >= 0 && discipline < MAXLDISC) { + slot = discipline; + } + + if (slot != -1 && linesw_p) + linesw[slot] = *linesw_p; + + return slot; +} + +/* + * ldisc_deregister: Deregister a line discipline obtained with + * ldisc_register. + * + * discipline: Index for discipline to unload. + */ +void +ldisc_deregister(discipline) + int discipline; +{ + if (discipline < MAXLDISC) { + linesw[discipline] = nodisc; + } +} + +static int +l_noopen(dev, tp) + dev_t dev; + struct tty *tp; +{ + + return (ENODEV); +} + +static int +l_noclose(tp, flag) + struct tty *tp; + int flag; +{ + + return (ENODEV); +} + +int +l_noread(tp, uio, flag) + struct tty *tp; + struct uio *uio; + int flag; +{ + + return (ENODEV); +} + +int +l_nowrite(tp, uio, flag) + struct tty *tp; + struct uio *uio; + int flag; +{ + + return (ENODEV); +} + +static int +l_norint(c, tp) + int c; + struct tty *tp; +{ + + return (ENODEV); +} + +static int +l_nostart(tp) + struct tty *tp; +{ + + return (ENODEV); +} + +/* + * Do nothing specific version of line + * discipline specific ioctl command. + */ +int +l_nullioctl(tp, cmd, data, flags, td) + struct tty *tp; + u_long cmd; + char *data; + int flags; + struct thread *td; +{ + + return (ENOIOCTL); +} |
