/* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

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

#ifndef _SYS_IPC_BUF_H

#define _SYS_IPC_BUF_H	1
#include <features.h>

#include <sys/types.h>

/* Mode bits for `msgget', `semget', and `shmget'.  */
#define IPC_CREAT	01000		/* Create key if key does not exist. */
#define IPC_EXCL	02000		/* Fail if key exists.  */
#define IPC_NOWAIT	04000		/* Return error on wait.  */

/* Control commands for `msgctl', `semctl', and `shmctl'.  */
#define IPC_RMID	0		/* Remove identifier.  */
#define IPC_SET		1		/* Set `ipc_perm' options.  */
#define IPC_STAT	2		/* Get `ipc_perm' options.  */
#define IPC_INFO	3		/* See ipcs.  */


__BEGIN_DECLS

/* Special key values.  */
#define IPC_PRIVATE	((__key_t) 0)	/* Private key.  */


/* Data structure used to pass permission information to IPC operations.  */
struct ipc_perm
  {
    __key_t __key;			/* Key.  */
    unsigned short int uid;		/* Owner's user ID.  */
    unsigned short int gid;		/* Owner's group ID.  */
    unsigned short int cuid;		/* Creator's user ID.  */
    unsigned short int cgid;		/* Creator's group ID.  */
    unsigned short int mode;		/* Read/write permission.  */
    unsigned short int __seq;		/* Sequence number.  */
  };


/* Kludge to work around Linux' restriction of only up to five
   arguments to a system call.  */
struct ipc_kludge
  {
    void *msgp;
    long int msgtyp;
  };

/* The actual system call: all functions are multiplexed by this.  */
extern int __ipc __P ((int __call, int __first, int __second, int __third,
		       void *__ptr));

/* The codes for the functions to use the multiplexer `__ipc'.  */
#define IPCOP_semop	 1
#define IPCOP_semget	 2
#define IPCOP_semctl	 3
#define IPCOP_msgsnd	11
#define IPCOP_msgrcv	12
#define IPCOP_msgget	13
#define IPCOP_msgctl	14
#define IPCOP_shmat	21
#define IPCOP_shmdt	22
#define IPCOP_shmget	23
#define IPCOP_shmctl	24

__END_DECLS

#endif /* bits/ipc_buf.h */