[linux-2.6-block.git] / include / uapi / linux / shm.h

#ifndef _UAPI_LINUX_SHM_H_
#define _UAPI_LINUX_SHM_H_

#include <linux/ipc.h>
#include <linux/errno.h>
#ifndef __KERNEL__
#include <unistd.h>
#endif

/*
 * SHMMNI, SHMMAX and SHMALL are default upper limits which can be
 * modified by sysctl. The SHMMAX and SHMALL values have been chosen to
 * be as large possible without facilitating scenarios where userspace
 * causes overflows when adjusting the limits via operations of the form
 * "retrieve current limit; add X; update limit". It is therefore not
 * advised to make SHMMAX and SHMALL any larger. These limits are
 * suitable for both 32 and 64-bit systems.
 */
#define SHMMIN 1			 /* min shared seg size (bytes) */
#define SHMMNI 4096			 /* max num of segs system wide */
#define SHMMAX (ULONG_MAX - (1UL << 24)) /* max shared seg size (bytes) */
#define SHMALL (ULONG_MAX - (1UL << 24)) /* max shm system wide (pages) */
#define SHMSEG SHMMNI			 /* max shared segs per process */

/* 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;
	__kernel_ulong_t shm_tot;	/* total allocated shm */
	__kernel_ulong_t shm_rss;	/* total resident shm */
	__kernel_ulong_t shm_swp;	/* total swapped shm */
	__kernel_ulong_t swap_attempts;
	__kernel_ulong_t swap_successes;
};


#endif /* _UAPI_LINUX_SHM_H_ */
Commit	Line	Data
607ca46e DH	1	#ifndef _UAPI_LINUX_SHM_H_
	2	#define _UAPI_LINUX_SHM_H_
	3
	4	#include <linux/ipc.h>
	5	#include <linux/errno.h>
	6	#ifndef __KERNEL__
	7	#include <unistd.h>
	8	#endif
	9
	10	/*
f57a19a7 DB	11	* SHMMNI, SHMMAX and SHMALL are default upper limits which can be
	12	* modified by sysctl. The SHMMAX and SHMALL values have been chosen to
	13	* be as large possible without facilitating scenarios where userspace
	14	* causes overflows when adjusting the limits via operations of the form
	15	* "retrieve current limit; add X; update limit". It is therefore not
	16	* advised to make SHMMAX and SHMALL any larger. These limits are
	17	* suitable for both 32 and 64-bit systems.
607ca46e	18	*/
607ca46e DH	19	#define SHMMIN 1 /* min shared seg size (bytes) */
607ca46e DH	20	#define SHMMNI 4096 /* max num of segs system wide */
f57a19a7 DB	21	#define SHMMAX (ULONG_MAX - (1UL << 24)) /* max shared seg size (bytes) */
f57a19a7 DB	22	#define SHMALL (ULONG_MAX - (1UL << 24)) /* max shm system wide (pages) */
607ca46e DH	23	#define SHMSEG SHMMNI /* max shared segs per process */
607ca46e DH	24
607ca46e DH	25	/* Obsolete, used only for backwards compatibility and libc5 compiles */
	26	struct shmid_ds {
	27	struct ipc_perm shm_perm; /* operation perms */
	28	int shm_segsz; /* size of segment (bytes) */
	29	__kernel_time_t shm_atime; /* last attach time */
	30	__kernel_time_t shm_dtime; /* last detach time */
	31	__kernel_time_t shm_ctime; /* last change time */
	32	__kernel_ipc_pid_t shm_cpid; /* pid of creator */
	33	__kernel_ipc_pid_t shm_lpid; /* pid of last operator */
	34	unsigned short shm_nattch; /* no. of current attaches */
	35	unsigned short shm_unused; /* compatibility */
	36	void shm_unused2; / ditto - used by DIPC */
	37	void shm_unused3; / unused */
	38	};
	39
	40	/* Include the definition of shmid64_ds and shminfo64 */
	41	#include <asm/shmbuf.h>
	42
	43	/* permission flag for shmget */
	44	#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
	45	#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
	46
	47	/* mode for attach */
	48	#define SHM_RDONLY 010000 /* read-only access */
	49	#define SHM_RND 020000 /* round attach address to SHMLBA boundary */
	50	#define SHM_REMAP 040000 /* take-over region on attach */
	51	#define SHM_EXEC 0100000 /* execution access */
	52
	53	/* super user shmctl commands */
	54	#define SHM_LOCK 11
	55	#define SHM_UNLOCK 12
	56
	57	/* ipcs ctl commands */
	58	#define SHM_STAT 13
	59	#define SHM_INFO 14
	60
	61	/* Obsolete, used only for backwards compatibility */
	62	struct shminfo {
	63	int shmmax;
	64	int shmmin;
	65	int shmmni;
	66	int shmseg;
	67	int shmall;
	68	};
	69
	70	struct shm_info {
	71	int used_ids;
f8dcdf01 L	72	__kernel_ulong_t shm_tot; /* total allocated shm */
	73	__kernel_ulong_t shm_rss; /* total resident shm */
	74	__kernel_ulong_t shm_swp; /* total swapped shm */
	75	__kernel_ulong_t swap_attempts;
	76	__kernel_ulong_t swap_successes;
607ca46e DH	77	};
	78
	79
	80	#endif /* _UAPI_LINUX_SHM_H_ */