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author | phk <phk@FreeBSD.org> | 2003-01-19 10:23:47 +0000 |
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committer | phk <phk@FreeBSD.org> | 2003-01-19 10:23:47 +0000 |
commit | a2409464e746bf354b17be1296bf4b3e38fd0182 (patch) | |
tree | 57cfb57d06dac1e2940c216e697fa31d0d863ee6 | |
parent | e5b097b12a766783bf5bf3a9a96f7f533903a51e (diff) | |
download | FreeBSD-src-a2409464e746bf354b17be1296bf4b3e38fd0182.zip FreeBSD-src-a2409464e746bf354b17be1296bf4b3e38fd0182.tar.gz |
When we use DEVFS, we don't need the /dev/tty pseudo-driver to do
more than return ENXIO from its open routine, so most of this file
is unneeded.
A straight #ifdef'ing would look quite messy, and make the file
quite unreadable, so instead I have simply added the DEVFS version
of the file at the top, protected by #ifndef NODEVFS.
Once we have removed NODEVFS option, we can retain 86 the 86 lines at
the top and drop the other 287 lines.
-rw-r--r-- | sys/kern/tty_tty.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/sys/kern/tty_tty.c b/sys/kern/tty_tty.c index a3a7a39..3a5524e 100644 --- a/sys/kern/tty_tty.c +++ b/sys/kern/tty_tty.c @@ -1,3 +1,91 @@ +#ifndef NODEVFS +/*- + * Copyright (c) 2003 Poul-Henning Kamp. All rights reserved. + * + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * $FreeBSD$ + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/conf.h> +#include <sys/kernel.h> +#include <sys/proc.h> +#include <sys/vnode.h> + +static d_open_t cttyopen; + +#define CDEV_MAJOR 1 + +static struct cdevsw ctty_cdevsw = { + /* open */ cttyopen, + /* close */ nullclose, + /* read */ noread, + /* write */ nowrite, + /* ioctl */ noioctl, + /* poll */ nopoll, + /* mmap */ nommap, + /* strategy */ nostrategy, + /* name */ "ctty", + /* maj */ CDEV_MAJOR, + /* dump */ nodump, + /* psize */ nopsize, + /* flags */ D_TTY, +}; + +static dev_t ctty; + +static int +cttyopen(dev_t dev, int flag, int mode, struct thread *td) +{ + + return (ENXIO); +} + +static void +ctty_clone(void *arg, char *name, int namelen, dev_t *dev) +{ + + if (*dev != NODEV) + return; + if (strcmp(name, "tty")) + return; + if (curthread->td_proc->p_flag & P_CONTROLT) + *dev = curthread->td_proc->p_session->s_ttyvp->v_rdev; + else + *dev = ctty; +} + +static void +ctty_drvinit(void *unused) +{ + + EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000); + ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty"); +} + +SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL) +#else /*- * Copyright (c) 1982, 1986, 1991, 1993 * The Regents of the University of California. All rights reserved. @@ -282,3 +370,4 @@ ctty_drvinit(unused) } SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL) +#endif |