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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61#define CDEV_MAJOR 1 62/* Don't make static, fdesc_vnops uses this. */ 63struct cdevsw ctty_cdevsw = 64 { cttyopen, nullclose, cttyread, cttywrite, /*1*/ 65 cttyioctl, nullstop, nullreset, nodevtotty,/* tty */ 66 cttypoll, nommap, NULL, "ctty", NULL, -1 };
| 61#define CDEV_MAJOR 1 62/* Don't make this static, since fdesc_vnops uses it. */ 63struct cdevsw ctty_cdevsw = { 64 cttyopen, nullclose, cttyread, cttywrite, 65 cttyioctl, nullstop, nullreset, nodevtotty, 66 cttypoll, nommap, NULL, "ctty", 67 NULL, -1, nodump, nopsize, 68 D_TTY, 69};
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69#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 70 71/*ARGSUSED*/ 72static int 73cttyopen(dev, flag, mode, p) 74 dev_t dev; 75 int flag, mode; 76 struct proc *p; 77{ 78 struct vnode *ttyvp = cttyvp(p); 79 int error; 80 81 if (ttyvp == NULL) 82 return (ENXIO); 83 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p); 84#ifdef PARANOID 85 /* 86 * Since group is tty and mode is 620 on most terminal lines 87 * and since sessions protect terminals from processes outside 88 * your session, this check is probably no longer necessary. 89 * Since it inhibits setuid root programs that later switch 90 * to another user from accessing /dev/tty, we have decided 91 * to delete this test. (mckusick 5/93) 92 */ 93 error = VOP_ACCESS(ttyvp, 94 (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p); 95 if (!error) 96#endif /* PARANOID */ 97 error = VOP_OPEN(ttyvp, flag, NOCRED, p); 98 VOP_UNLOCK(ttyvp, 0, p); 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 proc *p = uio->uio_procp; 110 register struct vnode *ttyvp = cttyvp(p); 111 int error; 112 113 if (ttyvp == NULL) 114 return (EIO); 115 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p); 116 error = VOP_READ(ttyvp, uio, flag, NOCRED); 117 VOP_UNLOCK(ttyvp, 0, p); 118 return (error); 119} 120 121/*ARGSUSED*/ 122static int 123cttywrite(dev, uio, flag) 124 dev_t dev; 125 struct uio *uio; 126 int flag; 127{ 128 struct proc *p = uio->uio_procp; 129 struct vnode *ttyvp = cttyvp(uio->uio_procp); 130 int error; 131 132 if (ttyvp == NULL) 133 return (EIO); 134 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p); 135 error = VOP_WRITE(ttyvp, uio, flag, NOCRED); 136 VOP_UNLOCK(ttyvp, 0, p); 137 return (error); 138} 139 140/*ARGSUSED*/ 141static int 142cttyioctl(dev, cmd, addr, flag, p) 143 dev_t dev; 144 u_long cmd; 145 caddr_t addr; 146 int flag; 147 struct proc *p; 148{ 149 struct vnode *ttyvp = cttyvp(p); 150 151 if (ttyvp == NULL) 152 return (EIO); 153 if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */ 154 return EINVAL; /* to controlling tty -- infinite recursion */ 155 if (cmd == TIOCNOTTY) { 156 if (!SESS_LEADER(p)) { 157 p->p_flag &= ~P_CONTROLT; 158 return (0); 159 } else 160 return (EINVAL); 161 } 162 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p)); 163} 164 165/*ARGSUSED*/ 166static int 167cttypoll(dev, events, p) 168 dev_t dev; 169 int events; 170 struct proc *p; 171{ 172 struct vnode *ttyvp = cttyvp(p); 173 174 if (ttyvp == NULL) 175 /* try operation to get EOF/failure */ 176 return (seltrue(dev, events, p)); 177 return (VOP_POLL(ttyvp, events, p->p_ucred, p)); 178} 179 180static int ctty_devsw_installed; 181#ifdef DEVFS 182static void *ctty_devfs_token; 183#endif 184 185static void ctty_drvinit __P((void *unused)); 186static void 187ctty_drvinit(unused) 188 void *unused; 189{ 190 dev_t dev; 191 192 if( ! ctty_devsw_installed ) { 193 dev = makedev(CDEV_MAJOR,0); 194 cdevsw_add(&dev,&ctty_cdevsw,NULL); 195 ctty_devsw_installed = 1; 196#ifdef DEVFS 197 ctty_devfs_token = 198 devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0, 199 0666, "tty"); 200#endif 201 } 202} 203 204SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
| 71#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 72 73/*ARGSUSED*/ 74static int 75cttyopen(dev, flag, mode, p) 76 dev_t dev; 77 int flag, mode; 78 struct proc *p; 79{ 80 struct vnode *ttyvp = cttyvp(p); 81 int error; 82 83 if (ttyvp == NULL) 84 return (ENXIO); 85 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p); 86#ifdef PARANOID 87 /* 88 * Since group is tty and mode is 620 on most terminal lines 89 * and since sessions protect terminals from processes outside 90 * your session, this check is probably no longer necessary. 91 * Since it inhibits setuid root programs that later switch 92 * to another user from accessing /dev/tty, we have decided 93 * to delete this test. (mckusick 5/93) 94 */ 95 error = VOP_ACCESS(ttyvp, 96 (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p); 97 if (!error) 98#endif /* PARANOID */ 99 error = VOP_OPEN(ttyvp, flag, NOCRED, p); 100 VOP_UNLOCK(ttyvp, 0, p); 101 return (error); 102} 103 104/*ARGSUSED*/ 105static int 106cttyread(dev, uio, flag) 107 dev_t dev; 108 struct uio *uio; 109 int flag; 110{ 111 struct proc *p = uio->uio_procp; 112 register struct vnode *ttyvp = cttyvp(p); 113 int error; 114 115 if (ttyvp == NULL) 116 return (EIO); 117 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p); 118 error = VOP_READ(ttyvp, uio, flag, NOCRED); 119 VOP_UNLOCK(ttyvp, 0, p); 120 return (error); 121} 122 123/*ARGSUSED*/ 124static int 125cttywrite(dev, uio, flag) 126 dev_t dev; 127 struct uio *uio; 128 int flag; 129{ 130 struct proc *p = uio->uio_procp; 131 struct vnode *ttyvp = cttyvp(uio->uio_procp); 132 int error; 133 134 if (ttyvp == NULL) 135 return (EIO); 136 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p); 137 error = VOP_WRITE(ttyvp, uio, flag, NOCRED); 138 VOP_UNLOCK(ttyvp, 0, p); 139 return (error); 140} 141 142/*ARGSUSED*/ 143static int 144cttyioctl(dev, cmd, addr, flag, p) 145 dev_t dev; 146 u_long cmd; 147 caddr_t addr; 148 int flag; 149 struct proc *p; 150{ 151 struct vnode *ttyvp = cttyvp(p); 152 153 if (ttyvp == NULL) 154 return (EIO); 155 if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */ 156 return EINVAL; /* to controlling tty -- infinite recursion */ 157 if (cmd == TIOCNOTTY) { 158 if (!SESS_LEADER(p)) { 159 p->p_flag &= ~P_CONTROLT; 160 return (0); 161 } else 162 return (EINVAL); 163 } 164 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p)); 165} 166 167/*ARGSUSED*/ 168static int 169cttypoll(dev, events, p) 170 dev_t dev; 171 int events; 172 struct proc *p; 173{ 174 struct vnode *ttyvp = cttyvp(p); 175 176 if (ttyvp == NULL) 177 /* try operation to get EOF/failure */ 178 return (seltrue(dev, events, p)); 179 return (VOP_POLL(ttyvp, events, p->p_ucred, p)); 180} 181 182static int ctty_devsw_installed; 183#ifdef DEVFS 184static void *ctty_devfs_token; 185#endif 186 187static void ctty_drvinit __P((void *unused)); 188static void 189ctty_drvinit(unused) 190 void *unused; 191{ 192 dev_t dev; 193 194 if( ! ctty_devsw_installed ) { 195 dev = makedev(CDEV_MAJOR,0); 196 cdevsw_add(&dev,&ctty_cdevsw,NULL); 197 ctty_devsw_installed = 1; 198#ifdef DEVFS 199 ctty_devfs_token = 200 devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0, 201 0666, "tty"); 202#endif 203 } 204} 205 206SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
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