1 #ifndef _LINUX_SHM_H_
2 #define _LINUX_SHM_H_
3
4 #include <linux/ipc.h>
5 #include <asm/page.h>
6
7 /*
8 * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
9 * be increased by sysctl
10 */
11
12 #define SHMMAX 0x2000000 /* max shared seg size (bytes) */
13 #define SHMMIN 1 /* min shared seg size (bytes) */
14 #define SHMMNI 4096 /* max num of segs system wide */
15 #define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */
16 #define SHMSEG SHMMNI /* max shared segs per process */
17
18 #include <asm/shmparam.h>
19
20 /* Obsolete, used only for backwards compatibility and libc5 compiles */
21 struct shmid_ds {
22 struct ipc_perm shm_perm; /* operation perms */
23 int shm_segsz; /* size of segment (bytes) */
24 __kernel_time_t shm_atime; /* last attach time */
25 __kernel_time_t shm_dtime; /* last detach time */
26 __kernel_time_t shm_ctime; /* last change time */
27 __kernel_ipc_pid_t shm_cpid; /* pid of creator */
28 __kernel_ipc_pid_t shm_lpid; /* pid of last operator */
29 unsigned short shm_nattch; /* no. of current attaches */
30 unsigned short shm_unused; /* compatibility */
31 void *shm_unused2; /* ditto - used by DIPC */
32 void *shm_unused3; /* unused */
33 };
34
35 /* Include the definition of shmid64_ds and shminfo64 */
36 #include <asm/shmbuf.h>
37
38 /* permission flag for shmget */
39 #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
40 #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
41
42 /* mode for attach */
43 #define SHM_RDONLY 010000 /* read-only access */
44 #define SHM_RND 020000 /* round attach address to SHMLBA boundary */
45 #define SHM_REMAP 040000 /* take-over region on attach */
46
47 /* super user shmctl commands */
48 #define SHM_LOCK 11
49 #define SHM_UNLOCK 12
50
51 /* ipcs ctl commands */
52 #define SHM_STAT 13
53 #define SHM_INFO 14
54
55 /* Obsolete, used only for backwards compatibility */
56 struct shminfo {
57 int shmmax;
58 int shmmin;
59 int shmmni;
60 int shmseg;
61 int shmall;
62 };
63
64 struct shm_info {
65 int used_ids;
66 unsigned long shm_tot; /* total allocated shm */
67 unsigned long shm_rss; /* total resident shm */
68 unsigned long shm_swp; /* total swapped shm */
69 unsigned long swap_attempts;
70 unsigned long swap_successes;
71 };
72
73 #ifdef __KERNEL__
74
75 /* shm_mode upper byte flags */
76 #define SHM_DEST 01000 /* segment will be destroyed on last detach */
77 #define SHM_LOCKED 02000 /* segment will not be swapped */
78
79 asmlinkage long sys_shmget (key_t key, size_t size, int flag);
80 asmlinkage long sys_shmat (int shmid, char *shmaddr, int shmflg, unsigned long *addr);
81 asmlinkage long sys_shmdt (char *shmaddr);
82 asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds *buf);
83 extern void shm_unuse(swp_entry_t entry, struct page *page);
84
85 #endif /* __KERNEL__ */
86
87 #endif /* _LINUX_SHM_H_ */
88
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