1 #ifndef _LINUX_SHM_H_ 2 #define _LINUX_SHM_H_ 3 4 #include <asm/page.h> 5 #include <uapi/linux/shm.h> 6 7 #define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */ 8 #include <asm/shmparam.h> 9 struct shmid_kernel /* private to the kernel */ 10 { 11 struct kern_ipc_perm shm_perm; 12 struct file * shm_file; 13 unsigned long shm_nattch; 14 unsigned long shm_segsz; 15 time_t shm_atim; 16 time_t shm_dtim; 17 time_t shm_ctim; 18 pid_t shm_cprid; 19 pid_t shm_lprid; 20 struct user_struct *mlock_user; 21 22 /* The task created the shm object. NULL if the task is dead. */ 23 struct task_struct *shm_creator; 24 }; 25 26 /* shm_mode upper byte flags */ 27 #define SHM_DEST 01000 /* segment will be destroyed on last detach */ 28 #define SHM_LOCKED 02000 /* segment will not be swapped */ 29 #define SHM_HUGETLB 04000 /* segment will use huge TLB pages */ 30 #define SHM_NORESERVE 010000 /* don't check for reservations */ 31 32 #ifdef CONFIG_SYSVIPC 33 long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr, 34 unsigned long shmlba); 35 extern int is_file_shm_hugepages(struct file *file); 36 extern void exit_shm(struct task_struct *task); 37 #else 38 static inline long do_shmat(int shmid, char __user *shmaddr, 39 int shmflg, unsigned long *addr, 40 unsigned long shmlba) 41 { 42 return -ENOSYS; 43 } 44 static inline int is_file_shm_hugepages(struct file *file) 45 { 46 return 0; 47 } 48 static inline void exit_shm(struct task_struct *task) 49 { 50 } 51 #endif 52 53 #endif /* _LINUX_SHM_H_ */ 54