Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
9struct 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
32struct sysv_shm {
33 struct list_head shm_clist;
34};
35
36long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
37 unsigned long shmlba);
38bool is_file_shm_hugepages(struct file *file);
39void exit_shm(struct task_struct *task);
40#define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
41#else
42struct sysv_shm {
43 /* empty */
44};
45
46static inline long do_shmat(int shmid, char __user *shmaddr,
47 int shmflg, unsigned long *addr,
48 unsigned long shmlba)
49{
50 return -ENOSYS;
51}
52static inline bool is_file_shm_hugepages(struct file *file)
53{
54 return false;
55}
56static inline void exit_shm(struct task_struct *task)
57{
58}
59static inline void shm_init_task(struct task_struct *task)
60{
61}
62#endif
63
64#endif /* _LINUX_SHM_H_ */