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/*
11 * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
12 * be increased by sysctl
13 */
14
15#define SHMMAX 0x2000000		 /* max shared seg size (bytes) */
16#define SHMMIN 1			 /* min shared seg size (bytes) */
17#define SHMMNI 4096			 /* max num of segs system wide */
18#ifndef __KERNEL__
19#define SHMALL (SHMMAX/getpagesize()*(SHMMNI/16))
20#endif
21#define SHMSEG SHMMNI			 /* max shared segs per process */
22
23
24/* Obsolete, used only for backwards compatibility and libc5 compiles */
25struct shmid_ds {
26	struct ipc_perm		shm_perm;	/* operation perms */
27	int			shm_segsz;	/* size of segment (bytes) */
28	__kernel_time_t		shm_atime;	/* last attach time */
29	__kernel_time_t		shm_dtime;	/* last detach time */
30	__kernel_time_t		shm_ctime;	/* last change time */
31	__kernel_ipc_pid_t	shm_cpid;	/* pid of creator */
32	__kernel_ipc_pid_t	shm_lpid;	/* pid of last operator */
33	unsigned short		shm_nattch;	/* no. of current attaches */
34	unsigned short 		shm_unused;	/* compatibility */
35	void 			*shm_unused2;	/* ditto - used by DIPC */
36	void			*shm_unused3;	/* unused */
37};
38
39/* Include the definition of shmid64_ds and shminfo64 */
40#include <asm/shmbuf.h>
41
42/* permission flag for shmget */
43#define SHM_R		0400	/* or S_IRUGO from <linux/stat.h> */
44#define SHM_W		0200	/* or S_IWUGO from <linux/stat.h> */
45
46/* mode for attach */
47#define	SHM_RDONLY	010000	/* read-only access */
48#define	SHM_RND		020000	/* round attach address to SHMLBA boundary */
49#define	SHM_REMAP	040000	/* take-over region on attach */
50#define	SHM_EXEC	0100000	/* execution access */
51
52/* super user shmctl commands */
53#define SHM_LOCK 	11
54#define SHM_UNLOCK 	12
55
56/* ipcs ctl commands */
57#define SHM_STAT 	13
58#define SHM_INFO 	14
59
60/* Obsolete, used only for backwards compatibility */
61struct	shminfo {
62	int shmmax;
63	int shmmin;
64	int shmmni;
65	int shmseg;
66	int shmall;
67};
68
69struct shm_info {
70	int used_ids;
71	__kernel_ulong_t shm_tot;	/* total allocated shm */
72	__kernel_ulong_t shm_rss;	/* total resident shm */
73	__kernel_ulong_t shm_swp;	/* total swapped shm */
74	__kernel_ulong_t swap_attempts;
75	__kernel_ulong_t swap_successes;
76};
77
78
79#endif /* _UAPI_LINUX_SHM_H_ */
80