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1.1 root 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: }
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