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_UTSNAME_H
3#define _LINUX_UTSNAME_H
4
5
6#include <linux/sched.h>
7#include <linux/kref.h>
8#include <linux/nsproxy.h>
9#include <linux/ns_common.h>
10#include <linux/err.h>
11#include <uapi/linux/utsname.h>
12
13enum uts_proc {
14 UTS_PROC_OSTYPE,
15 UTS_PROC_OSRELEASE,
16 UTS_PROC_VERSION,
17 UTS_PROC_HOSTNAME,
18 UTS_PROC_DOMAINNAME,
19};
20
21struct user_namespace;
22extern struct user_namespace init_user_ns;
23
24struct uts_namespace {
25 struct kref kref;
26 struct new_utsname name;
27 struct user_namespace *user_ns;
28 struct ucounts *ucounts;
29 struct ns_common ns;
30} __randomize_layout;
31extern struct uts_namespace init_uts_ns;
32
33#ifdef CONFIG_UTS_NS
34static inline void get_uts_ns(struct uts_namespace *ns)
35{
36 kref_get(&ns->kref);
37}
38
39extern struct uts_namespace *copy_utsname(unsigned long flags,
40 struct user_namespace *user_ns, struct uts_namespace *old_ns);
41extern void free_uts_ns(struct kref *kref);
42
43static inline void put_uts_ns(struct uts_namespace *ns)
44{
45 kref_put(&ns->kref, free_uts_ns);
46}
47#else
48static inline void get_uts_ns(struct uts_namespace *ns)
49{
50}
51
52static inline void put_uts_ns(struct uts_namespace *ns)
53{
54}
55
56static inline struct uts_namespace *copy_utsname(unsigned long flags,
57 struct user_namespace *user_ns, struct uts_namespace *old_ns)
58{
59 if (flags & CLONE_NEWUTS)
60 return ERR_PTR(-EINVAL);
61
62 return old_ns;
63}
64#endif
65
66#ifdef CONFIG_PROC_SYSCTL
67extern void uts_proc_notify(enum uts_proc proc);
68#else
69static inline void uts_proc_notify(enum uts_proc proc)
70{
71}
72#endif
73
74static inline struct new_utsname *utsname(void)
75{
76 return ¤t->nsproxy->uts_ns->name;
77}
78
79static inline struct new_utsname *init_utsname(void)
80{
81 return &init_uts_ns.name;
82}
83
84extern struct rw_semaphore uts_sem;
85
86#endif /* _LINUX_UTSNAME_H */