Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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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};
27extern struct uts_namespace init_uts_ns;
28
29#ifdef CONFIG_UTS_NS
30static inline void get_uts_ns(struct uts_namespace *ns)
31{
32 kref_get(&ns->kref);
33}
34
35extern struct uts_namespace *copy_utsname(unsigned long flags,
36 struct task_struct *tsk);
37extern void free_uts_ns(struct kref *kref);
38
39static inline void put_uts_ns(struct uts_namespace *ns)
40{
41 kref_put(&ns->kref, free_uts_ns);
42}
43#else
44static inline void get_uts_ns(struct uts_namespace *ns)
45{
46}
47
48static inline void put_uts_ns(struct uts_namespace *ns)
49{
50}
51
52static inline struct uts_namespace *copy_utsname(unsigned long flags,
53 struct task_struct *tsk)
54{
55 if (flags & CLONE_NEWUTS)
56 return ERR_PTR(-EINVAL);
57
58 return tsk->nsproxy->uts_ns;
59}
60#endif
61
62#ifdef CONFIG_PROC_SYSCTL
63extern void uts_proc_notify(enum uts_proc proc);
64#else
65static inline void uts_proc_notify(enum uts_proc proc)
66{
67}
68#endif
69
70static inline struct new_utsname *utsname(void)
71{
72 return ¤t->nsproxy->uts_ns->name;
73}
74
75static inline struct new_utsname *init_utsname(void)
76{
77 return &init_uts_ns.name;
78}
79
80extern struct rw_semaphore uts_sem;
81
82#endif /* _LINUX_UTSNAME_H */