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