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1.1 root 1: /* $Header: /kernel/kersrc/io.286/msgcon.c,v 1.1 92/07/17 15:24:36 bin Exp Locker: bin $
2: *
3: * The information contained herein is a trade secret of INETCO
4: * Systems, and is confidential information. It is provided under
5: * a license agreement, and may be copied or disclosed only under
6: * the terms of that agreement. Any reproduction or disclosure of
7: * this material without the express written authorization of
8: * INETCO Systems or persuant to the license agreement is unlawful.
9: *
10: * Copyright (c) 1987, 1985, 1984.
11: * An unpublished work by INETCO Systems, Ltd.
12: * All rights reserved.
13: */
14:
15: /*
16: * System V Compatible Message Device Driver
17: *
18: * This device driver provides System V compatible messaging operations.
19: * Operations are performed through the message device (/dev/msg).
20: * and are implemented as ioctl calls from msgctl, msgget, msgsnd, msgrcv
21: * utilities.
22: *
23: * Author: Allan Cornish, INETCO Systems Ltd., Oct 1984
24: *
25: * $Log: msgcon.c,v $
26: * Revision 1.1 92/07/17 15:24:36 bin
27: * Initial revision
28: *
29: * Revision 2.1 88/09/03 13:09:32 src
30: * *** empty log message ***
31: *
32: * Revision 1.1 88/03/24 17:05:49 src
33: * Initial revision
34: *
35: * 87/03/02 Allan Cornish /usr/src/sys/i8086/drv/msgcon.c
36: * Msgioctl() now supports long key [was short] on MSGGET operations.
37: * This allows compatability with System V.
38: *
39: * 85/08/06 Allan Cornish
40: * Msg.c split into configuration (msgcon.c) and implementation (msg.c).
41: *
42: * 85/07/03 Allan Cornish
43: * Simplified msgopen by ignoring minor device, which previously had to be 0.
44: *
45: * 84/01/30 Allan Cornish
46: * Initial revision.
47: */
48:
49: #include <coherent.h>
50: #include <types.h>
51: #include <errno.h>
52: #include <con.h>
53: #include <msg.h>
54:
55: /*
56: * Functions.
57: */
58:
59: int msgopen();
60: int msgioctl();
61: int nulldev();
62: int nonedev();
63:
64: /*
65: * Device Configuration.
66: */
67:
68: CON msgcon = {
69: DFCHR, /* Flags */
70: 25, /* Major Index */
71: msgopen, /* Open */
72: nulldev, /* Close */
73: nonedev, /* Block */
74: nonedev, /* Read */
75: nonedev, /* Write */
76: msgioctl, /* Ioctl */
77: nulldev, /* Power fail */
78: nulldev, /* Timeout */
79: nulldev, /* Load */
80: nulldev /* Unload */
81: };
82:
83: /*
84: * Message Device Open.
85: */
86:
87: static
88: msgopen( dev, mode )
89:
90: dev_t dev;
91: int mode;
92:
93: {
94: extern struct msqid_ds * msqs; /* Pointer to array of message queues */
95:
96: if ( ! msqs ) /* message queues not initialized */
97: msginit();
98:
99: if ( ! msqs ) /* no message queues */
100: u.u_error = ENODEV;
101: }
102:
103: /*
104: * Message Device Ioctl.
105: */
106:
107: static
108: msgioctl( dev, com, vec )
109:
110: dev_t dev;
111: int com;
112: register int *vec;
113:
114: {
115: switch ( com ) {
116:
117: case MSGCTL:
118: putuwd( vec+0,
119: umsgctl(getuwd( vec+1 ),
120: getuwd( vec+2 ),
121: getuwd( vec+3 ) ));
122: return;
123:
124: case MSGGET:
125: putuwd( vec+0,
126: umsgget(getuwd( vec+1 ),
127: getuwd( vec+2 ),
128: getuwd( vec+3 ) ));
129: return;
130:
131: case MSGSND:
132: putuwd( vec+0,
133: umsgsnd(getuwd( vec+1 ),
134: getuwd( vec+2 ),
135: getuwd( vec+3 ),
136: getuwd( vec+4 ) ));
137: return;
138:
139: case MSGRCV:
140: putuwd( vec+0,
141: umsgrcv(getuwd( vec+1 ),
142: getuwd( vec+2 ),
143: getuwd( vec+3 ),
144: getuwd( vec+4 ),
145: getuwd( vec+5 ),
146: getuwd( vec+6 ) ));
147: return;
148:
149: default:
150: u.u_error = EINVAL;
151: return;
152: }
153: }
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