/* 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