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1.1 root 1: /* $Header: /usr/src/sys/i8086/drv/RCS/semcon.c,v 2.1 88/09/03 13:11:55 src Exp $
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11: * An unpublished work by INETCO Systems, Ltd.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 Semaphore Device Driver
17: *
18: * This device driver provides System V compatible semaphore operations.
19: * Operations are performed through the semaphore device (/dev/sem).
20: * and are implemented as ioctl calls from semctl, semget, semop
21: * utilities.
22: *
23: * Author: Allan Cornish, INETCO Systems Ltd., Sep 1984
24: *
25: * $Log: /usr/src/sys/i8086/drv/RCS/semcon.c,v $
26: * Revision 2.1 88/09/03 13:11:55 src
27: * *** empty log message ***
28: *
29: * Revision 1.1 88/03/24 17:06:26 src
30: * Initial revision
31: *
32: * 87/03/02 Allan Cornish /usr/src/sys/i8086/drv/semcon.c
33: * Semioctl() now supports long key [was short] on SEMGET operations.
34: * This allows compatability with System V.
35: *
36: * 85/08/06 Allan Cornish
37: * Sem.c split into configuration (semcon.c) and implementation (sem.c).
38: * Semload() renamed to seminit().
39: *
40: * 85/07/03 Allan Cornish
41: * Eliminated semopen() and semclose() functions.
42: *
43: * 84/09/30 Allan Cornish
44: * Initial Revision.
45: */
46:
47: #include <coherent.h>
48: #include <types.h>
49: #include <uproc.h>
50: #include <errno.h>
51: #include <con.h>
52: #include <sem.h>
53:
54: /*
55: * Functions.
56: */
57:
58: int seminit();
59: int semioctl();
60: int nulldev();
61: int nonedev();
62:
63: /*
64: * Device Configuration.
65: */
66:
67: CON semcon = {
68: DFCHR, /* Flags */
69: 23, /* Major Index */
70: nulldev, /* Open */
71: nulldev, /* Close */
72: nonedev, /* Block */
73: nonedev, /* Read */
74: nonedev, /* Write */
75: semioctl, /* Ioctl */
76: nulldev, /* Power fail */
77: nulldev, /* Timeout */
78: seminit, /* Load */
79: nulldev /* Unload */
80: };
81:
82: /*
83: * Semaphore Device Ioctl.
84: */
85:
86: static
87: semioctl( dev, com, vec )
88:
89: dev_t dev;
90: int com;
91: register int *vec;
92:
93: {
94: switch ( com ) {
95:
96: case SEMCTL:
97: putuwd( vec+0,
98: usemctl(getuwd( vec+1 ),
99: getuwd( vec+2 ),
100: getuwd( vec+3 ),
101: getuwd( vec+4 ) ));
102: return;
103:
104: case SEMGET:
105: putuwd( vec+0,
106: usemget(getuwd( vec+1 ),
107: getuwd( vec+2 ),
108: getuwd( vec+3 ),
109: getuwd( vec+4 ) ));
110: return;
111:
112: case SEMOP:
113: putuwd( vec+0,
114: usemop( getuwd( vec+1 ),
115: getuwd( vec+2 ),
116: getuwd( vec+3 ) ));
117: return;
118:
119: default:
120: u.u_error = EINVAL;
121: return;
122: }
123: }
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