/* Copyright (C) 1995, 1996, 1997, 2000, 2002, 2004, 2009
   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_SHM_H
# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
#endif

#include <bits/types.h>

/* Permission flag for shmget.  */
#define SHM_R                0400                /* or S_IRUGO from <linux/stat.h> */
#define SHM_W                0200                /* or S_IWUGO from <linux/stat.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 */
#define SHM_EXEC        0100000                /* execution access */

/* 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 long 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() */
#if __WORDSIZE == 32
    unsigned long int __unused1;
#endif
    __time_t shm_dtime;                        /* time of last shmdt() */
#if __WORDSIZE == 32
    unsigned long int __unused2;
#endif
    __time_t shm_ctime;                        /* time of last change by shmctl() */
#if __WORDSIZE == 32
    unsigned long int __unused3;
#endif
    __pid_t shm_cpid;                        /* pid of creator */
    __pid_t shm_lpid;                        /* pid of last shmop */
    shmatt_t shm_nattch;                /* number of current attaches */
    unsigned long int __unused4;
    unsigned long int __unused5;
  };

#ifdef __USE_MISC

/* ipcs ctl commands */
# define SHM_STAT         13
# define SHM_INFO         14

/* shm_mode upper byte flags */
# define SHM_DEST        01000        /* segment will be destroyed on last detach */
# define SHM_LOCKED        02000   /* segment will not be swapped */
# define SHM_HUGETLB        04000        /* segment is mapped via hugetlb */
# define SHM_NORESERVE        010000        /* don't check for reservations */

struct        shminfo
  {
    unsigned long int shmmax;
    unsigned long int shmmin;
    unsigned long int shmmni;
    unsigned long int shmseg;
    unsigned long int shmall;
    unsigned long int __unused1;
    unsigned long int __unused2;
    unsigned long int __unused3;
    unsigned long int __unused4;
  };

struct shm_info
  {
    int used_ids;
    unsigned long int shm_tot;        /* total allocated shm */
    unsigned long int shm_rss;        /* total resident shm */
    unsigned long int shm_swp;        /* total swapped shm */
    unsigned long int swap_attempts;
    unsigned long int swap_successes;
  };

#endif /* __USE_MISC */

__END_DECLS