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 */ 95 #define SHM_NORESERVE 010000 /* don't check for reservations */ 96 97 #ifdef CONFIG_SYSVIPC 98 long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr); 99 #else 100 static inline long do_shmat(int shmid, char __user *shmaddr, 101 int shmflg, unsigned long *addr) 102 { 103 return -ENOSYS; 104 } 105 #endif 106 107 #endif /* __KERNEL__ */ 108 109 #endif /* _LINUX_SHM_H_ */ 110
