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15637ed4 RG |
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 | * | |
600f7f07 | 33 | * from: @(#)tty_tty.c 7.15 (Berkeley) 5/28/91 |
4c45483e | 34 | * $Id: tty_tty.c,v 1.2 1993/10/16 15:25:05 rgrimes Exp $ |
15637ed4 RG |
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*/ | |
4c45483e | 52 | int |
15637ed4 RG |
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*/ | |
4c45483e | 73 | int |
15637ed4 RG |
74 | cttyread(dev, uio, flag) |
75 | dev_t dev; | |
76 | struct uio *uio; | |
4c45483e | 77 | int flag; |
15637ed4 RG |
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*/ | |
4c45483e | 91 | int |
15637ed4 RG |
92 | cttywrite(dev, uio, flag) |
93 | dev_t dev; | |
94 | struct uio *uio; | |
4c45483e | 95 | int flag; |
15637ed4 RG |
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*/ | |
4c45483e | 109 | int |
15637ed4 RG |
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); | |
4c45483e GW |
121 | if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */ |
122 | return EINVAL; /* to controlling tty - infinite recursion */ | |
123 | else if (cmd == TIOCNOTTY) { | |
15637ed4 RG |
124 | if (!SESS_LEADER(p)) { |
125 | p->p_flag &= ~SCTTY; | |
126 | return (0); | |
127 | } else | |
128 | return (EINVAL); | |
129 | } | |
130 | return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p)); | |
131 | } | |
132 | ||
133 | /*ARGSUSED*/ | |
4c45483e | 134 | int |
15637ed4 RG |
135 | cttyselect(dev, flag, p) |
136 | dev_t dev; | |
137 | int flag; | |
138 | struct proc *p; | |
139 | { | |
140 | struct vnode *ttyvp = cttyvp(p); | |
141 | ||
142 | if (ttyvp == NULL) | |
143 | return (1); /* try operation to get EOF/failure */ | |
144 | return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p)); | |
145 | } |