1 #ifndef _LINUX_SHM_H_ 2 #define _LINUX_SHM_H_ 3 4 #include <linux/list.h> 5 #include <asm/page.h> 6 #include <uapi/linux/shm.h> 7 #include <asm/shmparam.h> 8 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 time64_t shm_atim; 16 time64_t shm_dtim; 17 time64_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 struct list_head shm_clist; /* list by creator */ 25 } __randomize_layout; 26 27 /* shm_mode upper byte flags */ 28 #define SHM_DEST 01000 /* segment will be destroyed on last detach */ 29 #define SHM_LOCKED 02000 /* segment will not be swapped */ 30 31 #ifdef CONFIG_SYSVIPC 32 struct sysv_shm { 33 struct list_head shm_clist; 34 }; 35 36 long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr, 37 unsigned long shmlba); 38 bool is_file_shm_hugepages(struct file *file); 39 void exit_shm(struct task_struct *task); 40 #define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist) 41 #else 42 struct sysv_shm { 43 /* empty */ 44 }; 45 46 static inline long do_shmat(int shmid, char __user *shmaddr, 47 int shmflg, unsigned long *addr, 48 unsigned long shmlba) 49 { 50 return -ENOSYS; 51 } 52 static inline bool is_file_shm_hugepages(struct file *file) 53 { 54 return false; 55 } 56 static inline void exit_shm(struct task_struct *task) 57 { 58 } 59 static inline void shm_init_task(struct task_struct *task) 60 { 61 } 62 #endif 63 64 #endif /* _LINUX_SHM_H_ */ 65