1/*-
2 * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Portions of this software were developed under sponsorship from Snow
6 * B.V., the Netherlands.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
|
31__FBSDID("$FreeBSD: head/sys/kern/tty_pty.c 196378 2009-08-19 14:30:46Z ed $");
|
| 31__FBSDID("$FreeBSD: head/sys/dev/pty/pty.c 196480 2009-08-23 20:26:09Z ed $"); |
32
33#include <sys/param.h>
34#include <sys/conf.h>
35#include <sys/eventhandler.h>
36#include <sys/fcntl.h>
37#include <sys/kernel.h>
|
| 38#include <sys/module.h> |
39#include <sys/proc.h>
40#include <sys/sysctl.h>
41#include <sys/syslog.h>
42#include <sys/systm.h>
43#include <sys/tty.h>
44
45/*
46 * This driver implements a BSD-style compatibility naming scheme for
47 * the pts(4) driver. We just call into pts(4) to create the actual PTY.
48 * To make sure we don't use the same PTY multiple times, we abuse
49 * si_drv1 inside the cdev to mark whether the PTY is in use.
50 */
51
52static unsigned int pty_warningcnt = 1;
53SYSCTL_UINT(_kern, OID_AUTO, tty_pty_warningcnt, CTLFLAG_RW,
54 &pty_warningcnt, 0,
55 "Warnings that will be triggered upon legacy PTY allocation");
56
57static int
58ptydev_fdopen(struct cdev *dev, int fflags, struct thread *td, struct file *fp)
59{
60 int error;
61 char name[6]; /* "ttyXX" */
62
63 if (!atomic_cmpset_ptr((uintptr_t *)&dev->si_drv1, 0, 1))
64 return (EBUSY);
65
66 /* Generate device name and create PTY. */
67 strcpy(name, devtoname(dev));
68 name[0] = 't';
69
70 error = pts_alloc_external(fflags & (FREAD|FWRITE), td, fp, dev, name);
71 if (error != 0) {
72 destroy_dev_sched(dev);
73 return (error);
74 }
75
76 /* Raise a warning when a legacy PTY has been allocated. */
77 if (pty_warningcnt > 0) {
78 pty_warningcnt--;
79 log(LOG_INFO, "pid %d (%s) is using legacy pty devices%s\n",
80 td->td_proc->p_pid, td->td_name,
81 pty_warningcnt ? "" : " - not logging anymore");
82 }
83
84 return (0);
85}
86
87static struct cdevsw ptydev_cdevsw = {
88 .d_version = D_VERSION,
89 .d_fdopen = ptydev_fdopen,
90 .d_name = "ptydev",
91};
92
93static void
94pty_clone(void *arg, struct ucred *cr, char *name, int namelen,
95 struct cdev **dev)
96{
97
98 /* Cloning is already satisfied. */
99 if (*dev != NULL)
100 return;
101
102 /* Only catch /dev/ptyXX. */
103 if (namelen != 5 || bcmp(name, "pty", 3) != 0)
104 return;
105
106 /* Only catch /dev/pty[l-sL-S]X. */
107 if (!(name[3] >= 'l' && name[3] <= 's') &&
108 !(name[3] >= 'L' && name[3] <= 'S'))
109 return;
110
111 /* Only catch /dev/pty[l-sL-S][0-9a-v]. */
112 if (!(name[4] >= '0' && name[4] <= '9') &&
113 !(name[4] >= 'a' && name[4] <= 'v'))
114 return;
115
116 /* Create the controller device node. */
117 *dev = make_dev_credf(MAKEDEV_REF, &ptydev_cdevsw, 0,
118 NULL, UID_ROOT, GID_WHEEL, 0666, "%s", name);
119}
120
|
120static void
121pty_init(void *unused)
|
121static int
122pty_modevent(module_t mod, int type, void *data) |
123{
124
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124 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
|
125 switch(type) {
126 case MOD_LOAD:
127 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
128 break;
129 case MOD_SHUTDOWN:
130 break;
131 case MOD_UNLOAD:
132 /* XXX: No unloading support yet. */
133 return (EBUSY);
134 default:
135 return (EOPNOTSUPP);
136 }
137
138 return (0); |
139}
140
|
127SYSINIT(pty, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, pty_init, NULL);
|
| 141DEV_MODULE(pty, pty_modevent, NULL); |
|