1#ifndef _LINUX_SHM_H_ 2#define _LINUX_SHM_H_ 3 4#include <linux/ipc.h> 5#include <linux/errno.h> 6#ifdef __KERNEL__ 7#include <asm/page.h> 8#else 9#include <unistd.h> 10#endif 11 12/* 13 * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can 14 * be increased by sysctl 15 */ 16 17#define SHMMAX 0x2000000 /* max shared seg size (bytes) */ 18#define SHMMIN 1 /* min shared seg size (bytes) */ 19#define SHMMNI 4096 /* max num of segs system wide */ 20#ifdef __KERNEL__ 21#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */ 22#else 23#define SHMALL (SHMMAX/getpagesize()*(SHMMNI/16)) 24#endif 25#define SHMSEG SHMMNI /* max shared segs per process */ 26 27#ifdef __KERNEL__ 28#include <asm/shmparam.h> 29#endif 30 31/* Obsolete, used only for backwards compatibility and libc5 compiles */ 32struct shmid_ds { 33 struct ipc_perm shm_perm; /* operation perms */ 34 int shm_segsz; /* size of segment (bytes) */ 35 __kernel_time_t shm_atime; /* last attach time */ 36 __kernel_time_t shm_dtime; /* last detach time */ 37 __kernel_time_t shm_ctime; /* last change time */ 38 __kernel_ipc_pid_t shm_cpid; /* pid of creator */ 39 __kernel_ipc_pid_t shm_lpid; /* pid of last operator */ 40 unsigned short shm_nattch; /* no. of current attaches */ 41 unsigned short shm_unused; /* compatibility */ 42 void *shm_unused2; /* ditto - used by DIPC */ 43 void *shm_unused3; /* unused */ 44}; 45 46/* Include the definition of shmid64_ds and shminfo64 */ 47#include <asm/shmbuf.h> 48 49/* permission flag for shmget */ 50#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */ 51#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */ 52 53/* mode for attach */ 54#define SHM_RDONLY 010000 /* read-only access */ 55#define SHM_RND 020000 /* round attach address to SHMLBA boundary */ 56#define SHM_REMAP 040000 /* take-over region on attach */ 57#define SHM_EXEC 0100000 /* execution access */ 58 59/* super user shmctl commands */ 60#define SHM_LOCK 11 61#define SHM_UNLOCK 12 62 63/* ipcs ctl commands */ 64#define SHM_STAT 13 65#define SHM_INFO 14 66 67/* Obsolete, used only for backwards compatibility */ 68struct shminfo { 69 int shmmax; 70 int shmmin; 71 int shmmni; 72 int shmseg; 73 int shmall; 74}; 75 76struct shm_info { 77 int used_ids; 78 unsigned long shm_tot; /* total allocated shm */ 79 unsigned long shm_rss; /* total resident shm */ 80 unsigned long shm_swp; /* total swapped shm */ 81 unsigned long swap_attempts; 82 unsigned long swap_successes; 83}; 84 85#ifdef __KERNEL__ 86struct shmid_kernel /* private to the kernel */ 87{ 88 struct kern_ipc_perm shm_perm; 89 struct file * shm_file; 90 unsigned long shm_nattch; 91 unsigned long shm_segsz; 92 time_t shm_atim; 93 time_t shm_dtim; 94 time_t shm_ctim; 95 pid_t shm_cprid; 96 pid_t shm_lprid; 97 struct user_struct *mlock_user; 98}; 99 100/* shm_mode upper byte flags */ 101#define SHM_DEST 01000 /* segment will be destroyed on last detach */ 102#define SHM_LOCKED 02000 /* segment will not be swapped */ 103#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */ 104#define SHM_NORESERVE 010000 /* don't check for reservations */ 105 106#ifdef CONFIG_SYSVIPC 107long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr); 108extern int is_file_shm_hugepages(struct file *file); 109#else 110static inline long do_shmat(int shmid, char __user *shmaddr, 111 int shmflg, unsigned long *addr) 112{ 113 return -ENOSYS; 114} 115static inline int is_file_shm_hugepages(struct file *file) 116{ 117 return 0; 118} 119#endif 120 121#endif /* __KERNEL__ */ 122 123#endif /* _LINUX_SHM_H_ */ 124