Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _LINUX_UTSNAME_H
2#define _LINUX_UTSNAME_H
3
4#define __OLD_UTS_LEN 8
5
6struct oldold_utsname {
7 char sysname[9];
8 char nodename[9];
9 char release[9];
10 char version[9];
11 char machine[9];
12};
13
14#define __NEW_UTS_LEN 64
15
16struct old_utsname {
17 char sysname[65];
18 char nodename[65];
19 char release[65];
20 char version[65];
21 char machine[65];
22};
23
24struct new_utsname {
25 char sysname[65];
26 char nodename[65];
27 char release[65];
28 char version[65];
29 char machine[65];
30 char domainname[65];
31};
32
33#ifdef __KERNEL__
34
35#include <linux/sched.h>
36#include <linux/kref.h>
37#include <linux/nsproxy.h>
38#include <asm/atomic.h>
39
40struct uts_namespace {
41 struct kref kref;
42 struct new_utsname name;
43};
44extern struct uts_namespace init_uts_ns;
45
46static inline void get_uts_ns(struct uts_namespace *ns)
47{
48 kref_get(&ns->kref);
49}
50
51#ifdef CONFIG_UTS_NS
52extern int unshare_utsname(unsigned long unshare_flags,
53 struct uts_namespace **new_uts);
54extern int copy_utsname(int flags, struct task_struct *tsk);
55extern void free_uts_ns(struct kref *kref);
56
57static inline void put_uts_ns(struct uts_namespace *ns)
58{
59 kref_put(&ns->kref, free_uts_ns);
60}
61#else
62static inline int unshare_utsname(unsigned long unshare_flags,
63 struct uts_namespace **new_uts)
64{
65 if (unshare_flags & CLONE_NEWUTS)
66 return -EINVAL;
67
68 return 0;
69}
70
71static inline int copy_utsname(int flags, struct task_struct *tsk)
72{
73 return 0;
74}
75static inline void put_uts_ns(struct uts_namespace *ns)
76{
77}
78#endif
79
80static inline struct new_utsname *utsname(void)
81{
82 return ¤t->nsproxy->uts_ns->name;
83}
84
85static inline struct new_utsname *init_utsname(void)
86{
87 return &init_uts_ns.name;
88}
89
90extern struct rw_semaphore uts_sem;
91
92#endif /* __KERNEL__ */
93
94#endif /* _LINUX_UTSNAME_H */