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 */ 104