[deliverable/linux.git] / include / linux / shm.h

#ifndef _LINUX_SHM_H_
#define _LINUX_SHM_H_

#include <linux/ipc.h>
#include <linux/errno.h>
#include <asm/page.h>

/*
 * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
 * be increased by sysctl
 */

#define SHMMAX 0x2000000		 /* max shared seg size (bytes) */
#define SHMMIN 1			 /* min shared seg size (bytes) */
#define SHMMNI 4096			 /* max num of segs system wide */
#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */
#define SHMSEG SHMMNI			 /* max shared segs per process */

#ifdef __KERNEL__
#include <asm/shmparam.h>
#endif

/* Obsolete, used only for backwards compatibility and libc5 compiles */
struct shmid_ds {
	struct ipc_perm		shm_perm;	/* operation perms */
	int			shm_segsz;	/* size of segment (bytes) */
	__kernel_time_t		shm_atime;	/* last attach time */
	__kernel_time_t		shm_dtime;	/* last detach time */
	__kernel_time_t		shm_ctime;	/* last change time */
	__kernel_ipc_pid_t	shm_cpid;	/* pid of creator */
	__kernel_ipc_pid_t	shm_lpid;	/* pid of last operator */
	unsigned short		shm_nattch;	/* no. of current attaches */
	unsigned short 		shm_unused;	/* compatibility */
	void 			*shm_unused2;	/* ditto - used by DIPC */
	void			*shm_unused3;	/* unused */
};

/* Include the definition of shmid64_ds and shminfo64 */
#include <asm/shmbuf.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> */

/* mode for attach */
#define	SHM_RDONLY	010000	/* read-only access */
#define	SHM_RND		020000	/* round attach address to SHMLBA boundary */
#define	SHM_REMAP	040000	/* take-over region on attach */
#define	SHM_EXEC	0100000	/* execution access */

/* super user shmctl commands */
#define SHM_LOCK 	11
#define SHM_UNLOCK 	12

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

/* Obsolete, used only for backwards compatibility */
struct	shminfo {
	int shmmax;
	int shmmin;
	int shmmni;
	int shmseg;
	int shmall;
};

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

#ifdef __KERNEL__
struct shmid_kernel /* private to the kernel */
{	
	struct kern_ipc_perm	shm_perm;
	struct file *		shm_file;
	unsigned long		shm_nattch;
	unsigned long		shm_segsz;
	time_t			shm_atim;
	time_t			shm_dtim;
	time_t			shm_ctim;
	pid_t			shm_cprid;
	pid_t			shm_lprid;
	struct user_struct	*mlock_user;
};

/* 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 will use huge TLB pages */
#define SHM_NORESERVE   010000  /* don't check for reservations */

#ifdef CONFIG_SYSVIPC
long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr);
extern int is_file_shm_hugepages(struct file *file);
#else
static inline long do_shmat(int shmid, char __user *shmaddr,
				int shmflg, unsigned long *addr)
{
	return -ENOSYS;
}
static inline int is_file_shm_hugepages(struct file *file)
{
	return 0;
}
#endif

#endif /* __KERNEL__ */

#endif /* _LINUX_SHM_H_ */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_SHM_H_
	2	#define _LINUX_SHM_H_
	3
	4	#include <linux/ipc.h>
	5	#include <linux/errno.h>
	6	#include <asm/page.h>
	7
	8	/*
	9	* SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
	10	* be increased by sysctl
	11	*/
	12
	13	#define SHMMAX 0x2000000 /* max shared seg size (bytes) */
	14	#define SHMMIN 1 /* min shared seg size (bytes) */
	15	#define SHMMNI 4096 /* max num of segs system wide */
	16	#define SHMALL (SHMMAX/PAGE_SIZE(SHMMNI/16)) / max shm system wide (pages) */
	17	#define SHMSEG SHMMNI /* max shared segs per process */
	18
4029a917	19	#ifdef __KERNEL__
1da177e4	20	#include <asm/shmparam.h>
4029a917	21	#endif
1da177e4 LT	22
	23	/* Obsolete, used only for backwards compatibility and libc5 compiles */
	24	struct shmid_ds {
	25	struct ipc_perm shm_perm; /* operation perms */
	26	int shm_segsz; /* size of segment (bytes) */
	27	__kernel_time_t shm_atime; /* last attach time */
	28	__kernel_time_t shm_dtime; /* last detach time */
	29	__kernel_time_t shm_ctime; /* last change time */
	30	__kernel_ipc_pid_t shm_cpid; /* pid of creator */
	31	__kernel_ipc_pid_t shm_lpid; /* pid of last operator */
	32	unsigned short shm_nattch; /* no. of current attaches */
	33	unsigned short shm_unused; /* compatibility */
	34	void shm_unused2; / ditto - used by DIPC */
	35	void shm_unused3; / unused */
	36	};
	37
	38	/* Include the definition of shmid64_ds and shminfo64 */
	39	#include <asm/shmbuf.h>
	40
	41	/* permission flag for shmget */
	42	#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
	43	#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
	44
	45	/* mode for attach */
	46	#define SHM_RDONLY 010000 /* read-only access */
	47	#define SHM_RND 020000 /* round attach address to SHMLBA boundary */
	48	#define SHM_REMAP 040000 /* take-over region on attach */
	49	#define SHM_EXEC 0100000 /* execution access */
	50
	51	/* super user shmctl commands */
	52	#define SHM_LOCK 11
	53	#define SHM_UNLOCK 12
	54
	55	/* ipcs ctl commands */
	56	#define SHM_STAT 13
	57	#define SHM_INFO 14
	58
	59	/* Obsolete, used only for backwards compatibility */
	60	struct shminfo {
	61	int shmmax;
	62	int shmmin;
	63	int shmmni;
	64	int shmseg;
	65	int shmall;
	66	};
	67
	68	struct shm_info {
	69	int used_ids;
	70	unsigned long shm_tot; /* total allocated shm */
	71	unsigned long shm_rss; /* total resident shm */
	72	unsigned long shm_swp; /* total swapped shm */
	73	unsigned long swap_attempts;
	74	unsigned long swap_successes;
	75	};
	76
	77	#ifdef __KERNEL__
	78	struct shmid_kernel /* private to the kernel */
	79	{
	80	struct kern_ipc_perm shm_perm;
	81	struct file * shm_file;
1da177e4 LT	82	unsigned long shm_nattch;
	83	unsigned long shm_segsz;
	84	time_t shm_atim;
	85	time_t shm_dtim;
	86	time_t shm_ctim;
	87	pid_t shm_cprid;
	88	pid_t shm_lprid;
	89	struct user_struct *mlock_user;
	90	};
	91
	92	/* shm_mode upper byte flags */
	93	#define SHM_DEST 01000 /* segment will be destroyed on last detach */
	94	#define SHM_LOCKED 02000 /* segment will not be swapped */
	95	#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */
bf8f972d	96	#define SHM_NORESERVE 010000 /* don't check for reservations */
1da177e4 LT	97
	98	#ifdef CONFIG_SYSVIPC
	99	long do_shmat(int shmid, char __user shmaddr, int shmflg, unsigned long addr);
516dffdc	100	extern int is_file_shm_hugepages(struct file *file);
1da177e4 LT	101	#else
	102	static inline long do_shmat(int shmid, char __user *shmaddr,
	103	int shmflg, unsigned long *addr)
	104	{
	105	return -ENOSYS;
	106	}
516dffdc AL	107	static inline int is_file_shm_hugepages(struct file *file)
	108	{
	109	return 0;
	110	}
1da177e4 LT	111	#endif
	112
	113	#endif /* __KERNEL__ */
	114
	115	#endif /* _LINUX_SHM_H_ */