/* 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_SHM_H

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

#endif

#include <bits/types.h>

/* Flags for `shmat'.  */

#define SHM_RDONLY	010000		/* attach read-only else read-write */

#define SHM_RND		020000		/* round attach address to SHMLBA */

#define SHM_REMAP	040000		/* take-over region on attach */

/* Commands for `shmctl'.  */

#define SHM_LOCK	11		/* lock segment (root only) */

#define SHM_UNLOCK	12		/* unlock segment (root only) */

__BEGIN_DECLS

/* Segment low boundary address multiple.  */

#define SHMLBA		(__getpagesize ())

extern int __getpagesize (void) __THROW __attribute__ ((__const__));

/* Type to count number of attaches.  */

typedef unsigned short int shmatt_t;

/* Data structure describing a shared memory segment.  */

struct shmid_ds

  {

    struct ipc_perm shm_perm;		/* operation permission struct */

    size_t shm_segsz;			/* size of segment in bytes */

    __time_t shm_atime;			/* time of last shmat() */

    __time_t shm_dtime;			/* time of last shmdt() */

    __time_t shm_ctime;			/* time of last change by shmctl() */

    __pid_t shm_cpid;			/* pid of creator */

    __pid_t shm_lpid;			/* pid of last shmop */

    shmatt_t shm_nattch;		/* number of current attaches */

  };

__END_DECLS