1/*- 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
| 1/*- 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
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34 * $FreeBSD: head/sys/kern/tty_tty.c 83366 2001-09-12 08:38:13Z julian $
| 34 * $FreeBSD: head/sys/kern/tty_tty.c 91140 2002-02-23 11:12:57Z tanimura $
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35 */ 36 37/* 38 * Indirect driver for controlling tty. 39 */ 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/conf.h> 44#include <sys/kernel.h> 45#include <sys/lock.h>
| 35 */ 36 37/* 38 * Indirect driver for controlling tty. 39 */ 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/conf.h> 44#include <sys/kernel.h> 45#include <sys/lock.h>
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| 46#include <sys/mutex.h> 47#include <sys/sx.h>
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46#include <sys/proc.h> 47#include <sys/ttycom.h> 48#include <sys/vnode.h> 49 50static d_open_t cttyopen; 51static d_read_t cttyread; 52static d_write_t cttywrite; 53static d_ioctl_t cttyioctl; 54static d_poll_t cttypoll; 55 56#define CDEV_MAJOR 1 57 58static struct cdevsw ctty_cdevsw = { 59 /* open */ cttyopen, 60 /* close */ nullclose, 61 /* read */ cttyread, 62 /* write */ cttywrite, 63 /* ioctl */ cttyioctl, 64 /* poll */ cttypoll, 65 /* mmap */ nommap, 66 /* strategy */ nostrategy, 67 /* name */ "ctty", 68 /* maj */ CDEV_MAJOR, 69 /* dump */ nodump, 70 /* psize */ nopsize, 71 /* flags */ D_TTY, 72}; 73 74#define cttyvp(td) ((td)->td_proc->p_flag & P_CONTROLT ? (td)->td_proc->p_session->s_ttyvp : NULL) 75 76/*ARGSUSED*/ 77static int 78cttyopen(dev, flag, mode, td) 79 dev_t dev; 80 int flag, mode; 81 struct thread *td; 82{
| 48#include <sys/proc.h> 49#include <sys/ttycom.h> 50#include <sys/vnode.h> 51 52static d_open_t cttyopen; 53static d_read_t cttyread; 54static d_write_t cttywrite; 55static d_ioctl_t cttyioctl; 56static d_poll_t cttypoll; 57 58#define CDEV_MAJOR 1 59 60static struct cdevsw ctty_cdevsw = { 61 /* open */ cttyopen, 62 /* close */ nullclose, 63 /* read */ cttyread, 64 /* write */ cttywrite, 65 /* ioctl */ cttyioctl, 66 /* poll */ cttypoll, 67 /* mmap */ nommap, 68 /* strategy */ nostrategy, 69 /* name */ "ctty", 70 /* maj */ CDEV_MAJOR, 71 /* dump */ nodump, 72 /* psize */ nopsize, 73 /* flags */ D_TTY, 74}; 75 76#define cttyvp(td) ((td)->td_proc->p_flag & P_CONTROLT ? (td)->td_proc->p_session->s_ttyvp : NULL) 77 78/*ARGSUSED*/ 79static int 80cttyopen(dev, flag, mode, td) 81 dev_t dev; 82 int flag, mode; 83 struct thread *td; 84{
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83 struct vnode *ttyvp = cttyvp(td);
| 85 struct vnode *ttyvp;
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84 int error; 85
| 86 int error; 87
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| 88 PROC_LOCK(td->td_proc); 89 SESS_LOCK(td->td_proc->p_session); 90 ttyvp = cttyvp(td); 91 SESS_UNLOCK(td->td_proc->p_session); 92 PROC_UNLOCK(td->td_proc); 93
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86 if (ttyvp == NULL) 87 return (ENXIO); 88 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); 89 error = VOP_OPEN(ttyvp, flag, NOCRED, td); 90 VOP_UNLOCK(ttyvp, 0, td); 91 return (error); 92} 93 94/*ARGSUSED*/ 95static int 96cttyread(dev, uio, flag) 97 dev_t dev; 98 struct uio *uio; 99 int flag; 100{ 101 struct thread *td = uio->uio_td;
| 94 if (ttyvp == NULL) 95 return (ENXIO); 96 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); 97 error = VOP_OPEN(ttyvp, flag, NOCRED, td); 98 VOP_UNLOCK(ttyvp, 0, td); 99 return (error); 100} 101 102/*ARGSUSED*/ 103static int 104cttyread(dev, uio, flag) 105 dev_t dev; 106 struct uio *uio; 107 int flag; 108{ 109 struct thread *td = uio->uio_td;
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102 register struct vnode *ttyvp = cttyvp(td);
| 110 register struct vnode *ttyvp;
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103 int error; 104
| 111 int error; 112
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| 113 PROC_LOCK(td->td_proc); 114 SESS_LOCK(td->td_proc->p_session); 115 ttyvp = cttyvp(td); 116 SESS_UNLOCK(td->td_proc->p_session); 117 PROC_UNLOCK(td->td_proc); 118
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105 if (ttyvp == NULL) 106 return (EIO); 107 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); 108 error = VOP_READ(ttyvp, uio, flag, NOCRED); 109 VOP_UNLOCK(ttyvp, 0, td); 110 return (error); 111} 112 113/*ARGSUSED*/ 114static int 115cttywrite(dev, uio, flag) 116 dev_t dev; 117 struct uio *uio; 118 int flag; 119{ 120 struct thread *td = uio->uio_td;
| 119 if (ttyvp == NULL) 120 return (EIO); 121 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); 122 error = VOP_READ(ttyvp, uio, flag, NOCRED); 123 VOP_UNLOCK(ttyvp, 0, td); 124 return (error); 125} 126 127/*ARGSUSED*/ 128static int 129cttywrite(dev, uio, flag) 130 dev_t dev; 131 struct uio *uio; 132 int flag; 133{ 134 struct thread *td = uio->uio_td;
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121 struct vnode *ttyvp = cttyvp(uio->uio_td);
| 135 struct vnode *ttyvp;
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122 struct mount *mp; 123 int error; 124
| 136 struct mount *mp; 137 int error; 138
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| 139 PROC_LOCK(td->td_proc); 140 SESS_LOCK(td->td_proc->p_session); 141 ttyvp = cttyvp(td); 142 SESS_UNLOCK(td->td_proc->p_session); 143 PROC_UNLOCK(td->td_proc); 144
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125 if (ttyvp == NULL) 126 return (EIO); 127 mp = NULL; 128 if (ttyvp->v_type != VCHR && 129 (error = vn_start_write(ttyvp, &mp, V_WAIT | PCATCH)) != 0) 130 return (error); 131 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); 132 error = VOP_WRITE(ttyvp, uio, flag, NOCRED); 133 VOP_UNLOCK(ttyvp, 0, td); 134 vn_finished_write(mp); 135 return (error); 136} 137 138/*ARGSUSED*/ 139static int 140cttyioctl(dev, cmd, addr, flag, td) 141 dev_t dev; 142 u_long cmd; 143 caddr_t addr; 144 int flag; 145 struct thread *td; 146{
| 145 if (ttyvp == NULL) 146 return (EIO); 147 mp = NULL; 148 if (ttyvp->v_type != VCHR && 149 (error = vn_start_write(ttyvp, &mp, V_WAIT | PCATCH)) != 0) 150 return (error); 151 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); 152 error = VOP_WRITE(ttyvp, uio, flag, NOCRED); 153 VOP_UNLOCK(ttyvp, 0, td); 154 vn_finished_write(mp); 155 return (error); 156} 157 158/*ARGSUSED*/ 159static int 160cttyioctl(dev, cmd, addr, flag, td) 161 dev_t dev; 162 u_long cmd; 163 caddr_t addr; 164 int flag; 165 struct thread *td; 166{
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147 struct vnode *ttyvp = cttyvp(td);
| 167 struct vnode *ttyvp; 168 int error;
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148
| 169
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| 170 PROC_LOCK(td->td_proc); 171 SESS_LOCK(td->td_proc->p_session); 172 ttyvp = cttyvp(td); 173 SESS_UNLOCK(td->td_proc->p_session); 174 PROC_UNLOCK(td->td_proc); 175
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149 if (ttyvp == NULL) 150 return (EIO); 151 if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */ 152 return EINVAL; /* to controlling tty -- infinite recursion */ 153 if (cmd == TIOCNOTTY) {
| 176 if (ttyvp == NULL) 177 return (EIO); 178 if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */ 179 return EINVAL; /* to controlling tty -- infinite recursion */ 180 if (cmd == TIOCNOTTY) {
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154 if (!SESS_LEADER(td->td_proc)) {
| 181 PROC_LOCK(td->td_proc); 182 SESS_LOCK(td->td_proc->p_session); 183 error = 0; 184 if (!SESS_LEADER(td->td_proc))
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155 td->td_proc->p_flag &= ~P_CONTROLT;
| 185 td->td_proc->p_flag &= ~P_CONTROLT;
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156 return (0); 157 } else 158 return (EINVAL);
| 186 else 187 error = EINVAL; 188 SESS_UNLOCK(td->td_proc->p_session); 189 PROC_UNLOCK(td->td_proc); 190 return (error);
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159 } 160 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, td)); 161} 162 163/*ARGSUSED*/ 164static int 165cttypoll(dev, events, td) 166 dev_t dev; 167 int events; 168 struct thread *td; 169{
| 191 } 192 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, td)); 193} 194 195/*ARGSUSED*/ 196static int 197cttypoll(dev, events, td) 198 dev_t dev; 199 int events; 200 struct thread *td; 201{
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170 struct vnode *ttyvp = cttyvp(td);
| 202 struct vnode *ttyvp;
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171
| 203
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| 204 PROC_LOCK(td->td_proc); 205 SESS_LOCK(td->td_proc->p_session); 206 ttyvp = cttyvp(td); 207 SESS_UNLOCK(td->td_proc->p_session); 208 PROC_UNLOCK(td->td_proc); 209
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172 if (ttyvp == NULL) 173 /* try operation to get EOF/failure */ 174 return (seltrue(dev, events, td)); 175 return (VOP_POLL(ttyvp, events, td->td_proc->p_ucred, td)); 176} 177 178static void ctty_clone __P((void *arg, char *name, int namelen, dev_t *dev)); 179 180static dev_t ctty; 181 182static void 183ctty_clone(void *arg, char *name, int namelen, dev_t *dev) 184{ 185 struct vnode *vp; 186 187 if (*dev != NODEV) 188 return; 189 if (strcmp(name, "tty")) 190 return; 191 vp = cttyvp(curthread); 192 if (vp == NULL) { 193 if (ctty) 194 *dev = ctty; 195 } else 196 *dev = vp->v_rdev; 197} 198 199 200static void ctty_drvinit __P((void *unused)); 201static void 202ctty_drvinit(unused) 203 void *unused; 204{ 205 206 if (devfs_present) { 207 EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000); 208 ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty"); 209 } else { 210 make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "tty"); 211 } 212} 213 214SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
| 210 if (ttyvp == NULL) 211 /* try operation to get EOF/failure */ 212 return (seltrue(dev, events, td)); 213 return (VOP_POLL(ttyvp, events, td->td_proc->p_ucred, td)); 214} 215 216static void ctty_clone __P((void *arg, char *name, int namelen, dev_t *dev)); 217 218static dev_t ctty; 219 220static void 221ctty_clone(void *arg, char *name, int namelen, dev_t *dev) 222{ 223 struct vnode *vp; 224 225 if (*dev != NODEV) 226 return; 227 if (strcmp(name, "tty")) 228 return; 229 vp = cttyvp(curthread); 230 if (vp == NULL) { 231 if (ctty) 232 *dev = ctty; 233 } else 234 *dev = vp->v_rdev; 235} 236 237 238static void ctty_drvinit __P((void *unused)); 239static void 240ctty_drvinit(unused) 241 void *unused; 242{ 243 244 if (devfs_present) { 245 EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000); 246 ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty"); 247 } else { 248 make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "tty"); 249 } 250} 251 252SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
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