Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_SHM_H_
3#define _LINUX_SHM_H_
4
5#include <linux/list.h>
6#include <asm/page.h>
7#include <uapi/linux/shm.h>
8#include <asm/shmparam.h>
9
10struct shmid_kernel /* private to the kernel */
11{
12 struct kern_ipc_perm shm_perm;
13 struct file *shm_file;
14 unsigned long shm_nattch;
15 unsigned long shm_segsz;
16 time64_t shm_atim;
17 time64_t shm_dtim;
18 time64_t shm_ctim;
19 pid_t shm_cprid;
20 pid_t shm_lprid;
21 struct user_struct *mlock_user;
22
23 /* The task created the shm object. NULL if the task is dead. */
24 struct task_struct *shm_creator;
25 struct list_head shm_clist; /* list by creator */
26} __randomize_layout;
27
28/* shm_mode upper byte flags */
29#define SHM_DEST 01000 /* segment will be destroyed on last detach */
30#define SHM_LOCKED 02000 /* segment will not be swapped */
31
32#ifdef CONFIG_SYSVIPC
33struct sysv_shm {
34 struct list_head shm_clist;
35};
36
37long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
38 unsigned long shmlba);
39bool is_file_shm_hugepages(struct file *file);
40void exit_shm(struct task_struct *task);
41#define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
42#else
43struct sysv_shm {
44 /* empty */
45};
46
47static inline long do_shmat(int shmid, char __user *shmaddr,
48 int shmflg, unsigned long *addr,
49 unsigned long shmlba)
50{
51 return -ENOSYS;
52}
53static inline bool is_file_shm_hugepages(struct file *file)
54{
55 return false;
56}
57static inline void exit_shm(struct task_struct *task)
58{
59}
60static inline void shm_init_task(struct task_struct *task)
61{
62}
63#endif
64
65#endif /* _LINUX_SHM_H_ */