Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _LINUX_SCHED_USER_H
2#define _LINUX_SCHED_USER_H
3
4#include <linux/uidgid.h>
5#include <linux/atomic.h>
6
7struct key;
8
9/*
10 * Some day this will be a full-fledged user tracking system..
11 */
12struct user_struct {
13 atomic_t __count; /* reference count */
14 atomic_t processes; /* How many processes does this user have? */
15 atomic_t sigpending; /* How many pending signals does this user have? */
16#ifdef CONFIG_FANOTIFY
17 atomic_t fanotify_listeners;
18#endif
19#ifdef CONFIG_EPOLL
20 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
21#endif
22#ifdef CONFIG_POSIX_MQUEUE
23 /* protected by mq_lock */
24 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
25#endif
26 unsigned long locked_shm; /* How many pages of mlocked shm ? */
27 unsigned long unix_inflight; /* How many files in flight in unix sockets */
28 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */
29
30#ifdef CONFIG_KEYS
31 struct key *uid_keyring; /* UID specific keyring */
32 struct key *session_keyring; /* UID's default session keyring */
33#endif
34
35 /* Hash table maintenance information */
36 struct hlist_node uidhash_node;
37 kuid_t uid;
38
39#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL)
40 atomic_long_t locked_vm;
41#endif
42};
43
44extern int uids_sysfs_init(void);
45
46extern struct user_struct *find_user(kuid_t);
47
48extern struct user_struct root_user;
49#define INIT_USER (&root_user)
50
51
52/* per-UID process charging. */
53extern struct user_struct * alloc_uid(kuid_t);
54static inline struct user_struct *get_uid(struct user_struct *u)
55{
56 atomic_inc(&u->__count);
57 return u;
58}
59extern void free_uid(struct user_struct *);
60
61#endif /* _LINUX_SCHED_USER_H */