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