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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _LINUX_SHM_H_ |
| 2 | #define _LINUX_SHM_H_ |
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| 3 | |||
| 4 | #include <linux/ipc.h> |
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| 5 | #include <asm/page.h> |
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| 6 | |||
| 7 | /* |
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| 8 | * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can |
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| 9 | * be increased by sysctl |
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| 10 | */ |
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| 11 | |||
| 12 | #define SHMMAX 0x2000000 /* max shared seg size (bytes) */ |
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| 13 | #define SHMMIN 1 /* min shared seg size (bytes) */ |
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| 14 | #define SHMMNI 4096 /* max num of segs system wide */ |
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| 15 | #define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */ |
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| 16 | #define SHMSEG SHMMNI /* max shared segs per process */ |
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| 17 | |||
| 18 | #include <asm/shmparam.h> |
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| 19 | |||
| 20 | /* Obsolete, used only for backwards compatibility and libc5 compiles */ |
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| 21 | struct shmid_ds { |
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| 22 | struct ipc_perm shm_perm; /* operation perms */ |
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| 23 | int shm_segsz; /* size of segment (bytes) */ |
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| 24 | __kernel_time_t shm_atime; /* last attach time */ |
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| 25 | __kernel_time_t shm_dtime; /* last detach time */ |
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| 26 | __kernel_time_t shm_ctime; /* last change time */ |
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| 27 | __kernel_ipc_pid_t shm_cpid; /* pid of creator */ |
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| 28 | __kernel_ipc_pid_t shm_lpid; /* pid of last operator */ |
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| 29 | unsigned short shm_nattch; /* no. of current attaches */ |
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| 30 | unsigned short shm_unused; /* compatibility */ |
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| 31 | void *shm_unused2; /* ditto - used by DIPC */ |
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| 32 | void *shm_unused3; /* unused */ |
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| 33 | }; |
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| 34 | |||
| 35 | /* Include the definition of shmid64_ds and shminfo64 */ |
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| 36 | #include <asm/shmbuf.h> |
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| 37 | |||
| 38 | /* permission flag for shmget */ |
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| 39 | #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */ |
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| 40 | #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */ |
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| 41 | |||
| 42 | /* mode for attach */ |
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| 43 | #define SHM_RDONLY 010000 /* read-only access */ |
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| 44 | #define SHM_RND 020000 /* round attach address to SHMLBA boundary */ |
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| 45 | #define SHM_REMAP 040000 /* take-over region on attach */ |
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| 46 | |||
| 47 | /* super user shmctl commands */ |
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| 48 | #define SHM_LOCK 11 |
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| 49 | #define SHM_UNLOCK 12 |
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| 50 | |||
| 51 | /* ipcs ctl commands */ |
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| 52 | #define SHM_STAT 13 |
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| 53 | #define SHM_INFO 14 |
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| 54 | |||
| 55 | /* Obsolete, used only for backwards compatibility */ |
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| 56 | struct shminfo { |
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| 57 | int shmmax; |
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| 58 | int shmmin; |
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| 59 | int shmmni; |
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| 60 | int shmseg; |
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| 61 | int shmall; |
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| 62 | }; |
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| 63 | |||
| 64 | struct shm_info { |
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| 65 | int used_ids; |
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| 66 | unsigned long shm_tot; /* total allocated shm */ |
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| 67 | unsigned long shm_rss; /* total resident shm */ |
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| 68 | unsigned long shm_swp; /* total swapped shm */ |
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| 69 | unsigned long swap_attempts; |
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| 70 | unsigned long swap_successes; |
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| 71 | }; |
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| 72 | |||
| 73 | #ifdef __KERNEL__ |
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| 74 | struct shmid_kernel /* private to the kernel */ |
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| 75 | { |
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| 76 | struct kern_ipc_perm shm_perm; |
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| 77 | struct file * shm_file; |
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| 78 | int id; |
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| 79 | unsigned long shm_nattch; |
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| 80 | unsigned long shm_segsz; |
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| 81 | time_t shm_atim; |
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| 82 | time_t shm_dtim; |
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| 83 | time_t shm_ctim; |
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| 84 | pid_t shm_cprid; |
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| 85 | pid_t shm_lprid; |
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| 86 | }; |
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| 87 | |||
| 88 | /* shm_mode upper byte flags */ |
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| 89 | #define SHM_DEST 01000 /* segment will be destroyed on last detach */ |
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| 90 | #define SHM_LOCKED 02000 /* segment will not be swapped */ |
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| 91 | #define SHM_HUGETLB 04000 /* segment will use huge TLB pages */ |
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| 92 | |||
| 93 | long sys_shmat (int shmid, char __user *shmaddr, int shmflg, unsigned long *addr); |
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| 94 | asmlinkage long sys_shmget (key_t key, size_t size, int flag); |
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| 95 | asmlinkage long sys_shmdt (char __user *shmaddr); |
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| 96 | asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf); |
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| 97 | |||
| 98 | #endif /* __KERNEL__ */ |
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| 99 | |||
| 100 | #endif /* _LINUX_SHM_H_ */ |