Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _LINUX_UTSNAME_H
2#define _LINUX_UTSNAME_H
3
4
5#include <linux/sched.h>
6#include <linux/kref.h>
7#include <linux/nsproxy.h>
8#include <linux/err.h>
9#include <uapi/linux/utsname.h>
10
11enum uts_proc {
12 UTS_PROC_OSTYPE,
13 UTS_PROC_OSRELEASE,
14 UTS_PROC_VERSION,
15 UTS_PROC_HOSTNAME,
16 UTS_PROC_DOMAINNAME,
17};
18
19struct user_namespace;
20extern struct user_namespace init_user_ns;
21
22struct uts_namespace {
23 struct kref kref;
24 struct new_utsname name;
25 struct user_namespace *user_ns;
26 unsigned int proc_inum;
27};
28extern struct uts_namespace init_uts_ns;
29
30#ifdef CONFIG_UTS_NS
31static inline void get_uts_ns(struct uts_namespace *ns)
32{
33 kref_get(&ns->kref);
34}
35
36extern struct uts_namespace *copy_utsname(unsigned long flags,
37 struct user_namespace *user_ns, struct uts_namespace *old_ns);
38extern void free_uts_ns(struct kref *kref);
39
40static inline void put_uts_ns(struct uts_namespace *ns)
41{
42 kref_put(&ns->kref, free_uts_ns);
43}
44#else
45static inline void get_uts_ns(struct uts_namespace *ns)
46{
47}
48
49static inline void put_uts_ns(struct uts_namespace *ns)
50{
51}
52
53static inline struct uts_namespace *copy_utsname(unsigned long flags,
54 struct user_namespace *user_ns, struct uts_namespace *old_ns)
55{
56 if (flags & CLONE_NEWUTS)
57 return ERR_PTR(-EINVAL);
58
59 return old_ns;
60}
61#endif
62
63#ifdef CONFIG_PROC_SYSCTL
64extern void uts_proc_notify(enum uts_proc proc);
65#else
66static inline void uts_proc_notify(enum uts_proc proc)
67{
68}
69#endif
70
71static inline struct new_utsname *utsname(void)
72{
73 return ¤t->nsproxy->uts_ns->name;
74}
75
76static inline struct new_utsname *init_utsname(void)
77{
78 return &init_uts_ns.name;
79}
80
81extern struct rw_semaphore uts_sem;
82
83#endif /* _LINUX_UTSNAME_H */