/* Copyright (C) 1995-2018 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, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _SYS_IPC_H

# error "Never use <bits/ipc.h> directly; include <sys/ipc.h> instead."

#endif

#include <bits/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.  */

#ifdef __USE_GNU

# define IPC_INFO	3		/* See ipcs.  */

#endif

/* 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.  */

  };