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 1.4 1993/05/22 11:41:52 cgd 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 cttyopen(dev, flag, mode, p) 53 dev_t dev; 54 int flag, mode; 55 struct proc *p; 56 { 57 struct vnode *ttyvp = cttyvp(p); 58 int error; 59 60 if (ttyvp == NULL) 61 return (ENXIO); 62 VOP_LOCK(ttyvp); 63 error = VOP_ACCESS(ttyvp, 64 (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p); 65 if (!error) 66 error = VOP_OPEN(ttyvp, flag, NOCRED, p); 67 VOP_UNLOCK(ttyvp); 68 return (error); 69 } 70 71 /*ARGSUSED*/ 72 cttyread(dev, uio, flag) 73 dev_t dev; 74 struct uio *uio; 75 { 76 register struct vnode *ttyvp = cttyvp(uio->uio_procp); 77 int error; 78 79 if (ttyvp == NULL) 80 return (EIO); 81 VOP_LOCK(ttyvp); 82 error = VOP_READ(ttyvp, uio, flag, NOCRED); 83 VOP_UNLOCK(ttyvp); 84 return (error); 85 } 86 87 /*ARGSUSED*/ 88 cttywrite(dev, uio, flag) 89 dev_t dev; 90 struct uio *uio; 91 { 92 register struct vnode *ttyvp = cttyvp(uio->uio_procp); 93 int error; 94 95 if (ttyvp == NULL) 96 return (EIO); 97 VOP_LOCK(ttyvp); 98 error = VOP_WRITE(ttyvp, uio, flag, NOCRED); 99 VOP_UNLOCK(ttyvp); 100 return (error); 101 } 102 103 /*ARGSUSED*/ 104 cttyioctl(dev, cmd, addr, flag, p) 105 dev_t dev; 106 int cmd; 107 caddr_t addr; 108 int flag; 109 struct proc *p; 110 { 111 struct vnode *ttyvp = cttyvp(p); 112 113 if (ttyvp == NULL) 114 return (EIO); 115 if (cmd == TIOCNOTTY) { 116 if (!SESS_LEADER(p)) { 117 p->p_flag &= ~SCTTY; 118 return (0); 119 } else 120 return (EINVAL); 121 } 122 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p)); 123 } 124 125 /*ARGSUSED*/ 126 cttyselect(dev, flag, p) 127 dev_t dev; 128 int flag; 129 struct proc *p; 130 { 131 struct vnode *ttyvp = cttyvp(p); 132 133 if (ttyvp == NULL) 134 return (1); /* try operation to get EOF/failure */ 135 return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p)); 136 } 137