/* $FreeBSD: src/sys/sys/shm.h,v 1.23 2005/04/02 12:33:36 das Exp $ */

 /*	$NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $	*/

 /*-

  * Copyright (c) 1994 Adam Glass

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  * 1. Redistributions of source code must retain the above copyright

  *    notice, this list of conditions and the following disclaimer.

  * 2. Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in the

  *    documentation and/or other materials provided with the distribution.

  * 4. The name of the author may not be used to endorse or promote products

  *    derived from this software without specific prior written permission

  *

  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  *

  *  Portions Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies).

  */

 /*

  * As defined+described in "X/Open System Interfaces and Headers"

  *                         Issue 4, p. XXX

  */

 #ifndef _SYS_SHM_H_

 #define _SYS_SHM_H_

 #include <sys/cdefs.h>

 #include <sys/ipc.h>

 #include <sys/_types.h>

 #define SHM_RDONLY  010000  /* Attach read-only (else read-write) */

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

 #define SHMLBA      PAGE_SIZE /* Segment low boundary address multiple */

 /* "official" access mode definitions; somewhat braindead since you have

    to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */

 #define SHM_R       (IPC_R)

 #define SHM_W       (IPC_W)

 /* predefine tbd *LOCK shmctl commands */

 #define	SHM_LOCK	11

 #define	SHM_UNLOCK	12

 /* ipcs shmctl commands */

 #define	SHM_STAT	13

 #define	SHM_INFO	14

 #ifndef _PID_T_DECLARED

 typedef	__pid_t		pid_t;

 #define	_PID_T_DECLARED

 #endif

 #ifndef _TIME_T_DECLARED

 typedef	__time_t	time_t;

 #define	_TIME_T_DECLARED

 #endif

 #ifndef _SIZE_T_DECLARED

 typedef	__size_t	size_t;

 #define	_SIZE_T_DECLARED

 #endif

 struct shmid_ds {

 	struct ipc_perm shm_perm;	/* operation permission structure */

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

 	pid_t           shm_lpid;   /* process ID of last shared memory op */

 	pid_t           shm_cpid;	/* process ID of creator */

 	short		shm_nattch;	/* number of current attaches */

 	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() */

 	void           *shm_internal;   /* sysv stupidity */

 };

 #ifdef _KERNEL

 /*

  * System 5 style catch-all structure for shared memory constants that

  * might be of interest to user programs.  Do we really want/need this?

  */

 struct shminfo {

 	int	shmmax,		/* max shared memory segment size (bytes) */

 		shmmin,		/* min shared memory segment size (bytes) */

 		shmmni,		/* max number of shared memory identifiers */

 		shmseg,		/* max shared memory segments per process */

 		shmall;		/* max amount of shared memory (pages) */

 };

 /* 

  * Add a kernel wrapper to the shmid_ds struct so that private info (like the

  * MAC label) can be added to it, without changing the user interface.

  */

 struct shmid_kernel {

 	struct shmid_ds u;

 	struct label *label;	/* MAC label */

 };

 extern struct shminfo	shminfo;

 struct shm_info {

 	int used_ids;

 	unsigned long shm_tot;

 	unsigned long shm_rss;

 	unsigned long shm_swp;

 	unsigned long swap_attempts;

 	unsigned long swap_successes;

 };

 struct thread;

 struct proc;

 struct vmspace;

 #else /* !_KERNEL */

 #include <sys/cdefs.h>

 #ifndef _SIZE_T_DECLARED

 typedef __size_t        size_t;

 #define _SIZE_T_DECLARED

 #endif

 // FUNCTION PROTOTYPES

 // FORWARD DECLARATIONS

 // CLASS/STRUCT/FUNCTION DECLARATION

 __BEGIN_DECLS

 /*

 * Get shared memory identifier using the IPC key generated by ftok.

 */

 IMPORT_C int shmget(key_t key, int size, int shmflg);

 /*

 * Attaches the shared memory segment associated with the shared memory identifier 

 * specified by shmid to the address space of the calling process.

 */

 IMPORT_C void* shmat(int shmid, const void *shmaddr, int shmflg);

 /*

 * Detaches the shared memory segment located at the address specified by shmaddr 

 * from the address space of the calling process.

 */

 IMPORT_C int shmdt(const void *shmaddr);

 /*

 * Provides a variety of shared memory control operations as specified by cmd.

 */

 IMPORT_C int shmctl(int shmid, int cmd, struct shmid_ds *buf);

 __END_DECLS

 #endif /* !_KERNEL */

 #endif // SHM_H

 //  End of File