/* Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _SYS_SEM_H
# error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
#endif

#include <sys/types.h>

/* Flags for `semop'.  */
#define SEM_UNDO       0x1000          /* undo the operation on exit */

/* Commands for `semctl'.  */
#define GETPID         11              /* get sempid */
#define GETVAL         12              /* get semval */
#define GETALL         13              /* get all semval's */
#define GETNCNT                14              /* get semncnt */
#define GETZCNT                15              /* get semzcnt */
#define SETVAL         16              /* set semval */
#define SETALL         17              /* set all semval's */


/* Data structure describing a set of semaphores.  */
struct semid_ds
{
  struct ipc_perm sem_perm;            /* operation permission struct */
  unsigned int __unused1;
  __time_t sem_otime;                  /* last semop() time */
  unsigned int __unused2;
  __time_t sem_ctime;                  /* last time changed by semctl() */
  unsigned long int sem_nsems;         /* number of semaphores in set */
  unsigned long __unused3;
  unsigned long __unused4;
};

/* The user should define a union like the following to use it for arguments
   for `semctl'.

   union semun
   {
     int val;                          <= value for SETVAL
     struct semid_ds *buf;             <= buffer for IPC_STAT & IPC_SET
     unsigned short int *array;                <= array for GETALL & SETALL
     struct seminfo *__buf;            <= buffer for IPC_INFO
   };

   Previous versions of this file used to define this union but this is
   incorrect.  One can test the macro _SEM_SEMUN_UNDEFINED to see whether
   one must define the union or not.  */
#define _SEM_SEMUN_UNDEFINED   1

#ifdef __USE_MISC

/* ipcs ctl cmds */
# define SEM_STAT 18
# define SEM_INFO 19

struct  seminfo
{
  int semmap;
  int semmni;
  int semmns;
  int semmnu;
  int semmsl;
  int semopm;
  int semume;
  int semusz;
  int semvmx;
  int semaem;
};

#endif /* __USE_MISC */
