usr/src/lib/libbc/inc/include/sys/sem.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1986 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #ifndef _sys_sem_h
  31 #define _sys_sem_h
  32
  33 #pragma ident   "%Z%%M% %I%     %E% SMI"
  34
  35 /*
  36  *      IPC Semaphore Facility.
  37  */
  38
  39 /*
  40  *      Semaphore Operation Flags.
  41  */
  42 #define SEM_UNDO        010000  /* set up adjust on exit entry */
  43
  44 /*
  45  *      Semctl Command Definitions.
  46  */
  47
  48 #define GETNCNT 3       /* get semncnt */
  49 #define GETPID  4       /* get sempid */
  50 #define GETVAL  5       /* get semval */
  51 #define GETALL  6       /* get all semval's */
  52 #define GETZCNT 7       /* get semzcnt */
  53 #define SETVAL  8       /* set semval */
  54 #define SETALL  9       /* set all semval's */
  55
  56 /*
  57  *      Structure Definitions.
  58  */
  59
  60 /*
  61  *      There is one semaphore id data structure for each set of semaphores
  62  *              in the system.
  63  */
  64
  65 struct semid_ds {
  66         struct ipc_perm sem_perm;       /* operation permission struct */
  67         struct sem      *sem_base;      /* ptr to first semaphore in set */
  68         ushort          sem_nsems;      /* # of semaphores in set */
  69         time_t          sem_otime;      /* last semop time */
  70         time_t          sem_ctime;      /* last change time */
  71 };
  72
  73 /*
  74  *      There is one semaphore structure for each semaphore in the system.
  75  */
  76
  77 struct sem {
  78         ushort  semval;         /* semaphore text map address */
  79         short   sempid;         /* pid of last operation */
  80         ushort  semncnt;        /* # awaiting semval > cval */
  81         ushort  semzcnt;        /* # awaiting semval = 0 */
  82 };
  83
  84 /*
  85  *      User semaphore template for semop system calls.
  86  */
  87
  88 struct sembuf {
  89         short   sem_num;        /* semaphore # */
  90         short   sem_op;         /* semaphore operation */
  91         short   sem_flg;        /* operation flags */
  92 };
  93
  94 /*
  95  *      'arg' argument template for semctl system calls.
  96  */
  97 union semun {
  98         int             val;    /* value for SETVAL */
  99         struct semid_ds *buf;   /* buffer for IPC_STAT & IPC_SET */
 100         ushort          *array; /* array for GETALL & SETALL */
 101 };
 102
 103 #endif /* !_sys_sem_h */