include/sys/sem.h

   1 /*      $NetBSD: sem.h,v 1.29 2009/01/19 19:39:41 christos Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
   9  * NASA Ames Research Center.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * SVID compatible sem.h file
  35  *
  36  * Author: Daniel Boulet
  37  */
  38
  39 #ifndef _SYS_SEM_H_
  40 #define _SYS_SEM_H_
  41
  42 #include <sys/featuretest.h>
  43
  44 #include <sys/ipc.h>
  45
  46 struct semid_ds {
  47         struct ipc_perm sem_perm;             /* operation permission struct */
  48         time_t          sem_otime;            /* last semop() time */
  49         unsigned long int __unused1;
  50         time_t          sem_ctime;            /* last time changed by semctl() */
  51         unsigned long int __unused2;
  52         unsigned long int sem_nsems;          /* number of semaphores in set */
  53         unsigned long int __unused3;
  54         unsigned long int __unused4;
  55 };
  56
  57 /*
  58  * semop's sops parameter structure
  59  */
  60 struct sembuf {
  61         unsigned short  sem_num;        /* semaphore # */
  62         short           sem_op;         /* semaphore operation */
  63         short           sem_flg;        /* operation flags */
  64 };
  65 #define SEM_UNDO        0x1000          /* undo changes on process exit */
  66
  67 /*
  68  * commands for semctl
  69  */
  70 #define GETPID          11              /* get sempid */
  71 #define GETVAL          12              /* get semval */
  72 #define GETALL          13              /* get all semval's */
  73 #define GETNCNT         14              /* get semncnt */
  74 #define GETZCNT         15              /* get semzcnt */
  75 #define SETVAL          16              /* set semval */
  76 #define SETALL          17              /* set all semval's */
  77
  78 #ifdef __USE_MISC
  79
  80 /* ipcs ctl cmds */
  81 # define SEM_STAT 18
  82 # define SEM_INFO 19
  83
  84 /*
  85  * semaphore info struct
  86  */
  87 struct seminfo {
  88         int32_t semmap;         /* # of entries in semaphore map */
  89         int32_t semmni;         /* # of semaphore identifiers */
  90         int32_t semmns;         /* # of semaphores in system */
  91         int32_t semmnu;         /* # of undo structures in system */
  92         int32_t semmsl;         /* max # of semaphores per id */
  93         int32_t semopm;         /* max # of operations per semop call */
  94         int32_t semume;         /* max # of undo entries per process */
  95         int32_t semusz;         /* size in bytes of undo structure */
  96         int32_t semvmx;         /* semaphore maximum value */
  97         int32_t semaem;         /* adjust on exit max value */
  98 };
  99
 100 #endif /* __USE_MISC */
 101
 102 /*
 103  * Configuration parameters
 104  */
 105 #define SEMMNI  128
 106 #define SEMMSL  250
 107 #define SEMMNS  (SEMMSL*SEMMNI)
 108
 109 #define SEMOPM  32
 110 #define SEMVMX  32767
 111
 112
 113 #include <sys/cdefs.h>
 114
 115 __BEGIN_DECLS
 116 int     semctl(int, int, int, ...);
 117 int     semget(key_t, int, int);
 118 int     semop(int, struct sembuf *, size_t);
 119 __END_DECLS
 120
 121 #endif /* !_SYS_SEM_H_ */