1 /*- 2 * Copyright (c) 1982, 1986, 1991 The Regents of the University of California. 3 * 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 * from: @(#)tty_tty.c 7.15 (Berkeley) 5/28/91 34 * $Id: tty_tty.c,v 1.5 1993/06/27 06:01:58 andrew Exp $ 35 */ 36 37 /* 38 * Indirect driver for controlling tty. 39 */ 40 #include "param.h" 41 #include "systm.h" 42 #include "conf.h" 43 #include "ioctl.h" 44 #include "tty.h" 45 #include "proc.h" 46 #include "vnode.h" 47 #include "file.h" 48 49 #define cttyvp(p) ((p)->p_flag&SCTTY ? (p)->p_session->s_ttyvp : NULL) 50 51 /*ARGSUSED*/ 52 int 53 cttyopen(dev, flag, mode, p) 54 dev_t dev; 55 int flag, mode; 56 struct proc *p; 57 { 58 struct vnode *ttyvp = cttyvp(p); 59 int error; 60 61 if (ttyvp == NULL) 62 return (ENXIO); 63 VOP_LOCK(ttyvp); 64 error = VOP_ACCESS(ttyvp, 65 (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p); 66 if (!error) 67 error = VOP_OPEN(ttyvp, flag, NOCRED, p); 68 VOP_UNLOCK(ttyvp); 69 return (error); 70 } 71 72 /*ARGSUSED*/ 73 int 74 cttyread(dev, uio, flag) 75 dev_t dev; 76 struct uio *uio; 77 int flag; 78 { 79 register struct vnode *ttyvp = cttyvp(uio->uio_procp); 80 int error; 81 82 if (ttyvp == NULL) 83 return (EIO); 84 VOP_LOCK(ttyvp); 85 error = VOP_READ(ttyvp, uio, flag, NOCRED); 86 VOP_UNLOCK(ttyvp); 87 return (error); 88 } 89 90 /*ARGSUSED*/ 91 int 92 cttywrite(dev, uio, flag) 93 dev_t dev; 94 struct uio *uio; 95 int flag; 96 { 97 register struct vnode *ttyvp = cttyvp(uio->uio_procp); 98 int error; 99 100 if (ttyvp == NULL) 101 return (EIO); 102 VOP_LOCK(ttyvp); 103 error = VOP_WRITE(ttyvp, uio, flag, NOCRED); 104 VOP_UNLOCK(ttyvp); 105 return (error); 106 } 107 108 /*ARGSUSED*/ 109 int 110 cttyioctl(dev, cmd, addr, flag, p) 111 dev_t dev; 112 int cmd; 113 caddr_t addr; 114 int flag; 115 struct proc *p; 116 { 117 struct vnode *ttyvp = cttyvp(p); 118 119 if (ttyvp == NULL) 120 return (EIO); 121 if (cmd == TIOCNOTTY) { 122 if (!SESS_LEADER(p)) { 123 p->p_flag &= ~SCTTY; 124 return (0); 125 } else 126 return (EINVAL); 127 } 128 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p)); 129 } 130 131 /*ARGSUSED*/ 132 int 133 cttyselect(dev, flag, p) 134 dev_t dev; 135 int flag; 136 struct proc *p; 137 { 138 struct vnode *ttyvp = cttyvp(p); 139 140 if (ttyvp == NULL) 141 return (1); /* try operation to get EOF/failure */ 142 return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p)); 143 } 144