/*
Copyright (c) 1993 Xerox Corporation.  All rights reserved.
*/
/*
 */

#ifndef __XR_sys_shm_h
#define __XR_sys_shm_h

#include <config/PCR_OS.h>

#include <xr/XR_sys_types.h>
#include <xr/XR_sys_ipc.h>

#include <sys/shm.h>

/*
 *	Shared Memory Operation Flags.
 */

#define	XR_SHM_RDONLY	010000	/* attach read-only (else read-write) */
#define	XR_SHM_RND	020000	/* round attach address to SHMLBA */

/*
 * Shmctl Command Definitions.
 */

#define XR_SHM_LOCK	3	/* Lock segment in core */
#define XR_SHM_UNLOCK	4	/* Unlock segment */

/*
 *	Implementation Constants.
 */
#define	XR_SHMLBA	0x1000	/* segment low boundary address multiple */
				/* (SHMLBA must be a power of 2) */

/*
 *	Structure Definitions.
 */

/*
 *	There is a shared mem id data structure for each segment in the system.
 */

struct XR_shmid_ds {
	struct XR_ipc_perm shm_perm;	/* operation permission struct */
	unsigned int	shm_segsz;	/* size of segment in bytes */
	unsigned short	shm_lpid;	/* pid of last shmop */
	unsigned short	shm_cpid;	/* pid of creator */
	unsigned short	shm_nattch;	/* number of current attaches */
	XR_time_t	shm_atime;	/* last shmat time */
	XR_time_t	shm_dtime;	/* last shmdt time */
	XR_time_t	shm_ctime;	/* last change time */
	void		*shm_amp;	/* segment anon_map pointer */
};

#if defined(PCR_OS_SUNOS4)

#   define XR_sys_shm_FlagsToHost(flags)	(flags)
#   define XR_sys_shm_CmdToHost(cmd)		(cmd)

extern void
XR_sys_shm_DSToHost(struct shmid_ds *hds, struct XR_shmid_ds *xds);

extern void
XR_sys_shm_DSFromHost(struct XR_shmid_ds *xds, struct shmid_ds *hds);

#elif defined(PCR_OS_SUNOS5)

#   define XR_sys_shm_FlagsToHost(flags)	(flags)

extern int
XR_sys_shm_CmdToHost(int cmd);

extern void
XR_sys_shm_DSToHost(struct shmid_ds *hds, struct XR_shmid_ds *xds);

extern void
XR_sys_shm_DSFromHost(struct XR_shmid_ds *xds, struct shmid_ds *hds);

#else
#   error os ?
#endif




#endif /*!__XR_sys_shm_h*/