FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_tty.c
1 /*-
2 * Copyright (c) 2003 Poul-Henning Kamp. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD: releng/5.1/sys/kern/tty_tty.c 111815 2003-03-03 12:15:54Z phk $
26 */
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/conf.h>
31 #include <sys/kernel.h>
32 #include <sys/proc.h>
33 #include <sys/vnode.h>
34
35 static d_open_t cttyopen;
36
37 #define CDEV_MAJOR 1
38
39 static struct cdevsw ctty_cdevsw = {
40 .d_open = cttyopen,
41 .d_close = nullclose,
42 .d_name = "ctty",
43 .d_maj = CDEV_MAJOR,
44 .d_flags = D_TTY,
45 };
46
47 static dev_t ctty;
48
49 static int
50 cttyopen(dev_t dev, int flag, int mode, struct thread *td)
51 {
52
53 return (ENXIO);
54 }
55
56 static void
57 ctty_clone(void *arg, char *name, int namelen, dev_t *dev)
58 {
59
60 if (*dev != NODEV)
61 return;
62 if (strcmp(name, "tty"))
63 return;
64 if (!(curthread->td_proc->p_flag & P_CONTROLT))
65 *dev = ctty;
66 else if (curthread->td_proc->p_session->s_ttyvp == NULL)
67 *dev = ctty;
68 else
69 *dev = curthread->td_proc->p_session->s_ttyvp->v_rdev;
70 }
71
72 static void
73 ctty_drvinit(void *unused)
74 {
75
76 EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000);
77 ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty");
78 }
79
80 SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
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