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gerrit-public.fairphone.software / kernel / msm-4.9 / 71b3346d182355f19509fadb8fe45114a35cc499 / . / include / linux / utsname.h
blob: 11232676bfff59af017b4b3343c67dc430004c4b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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
Cedric Le Goaterb119f132006-10-04 02:15:19 -0700[diff] [blame]33#ifdef __KERNEL__
34
35#include <linux/sched.h>
36#include <linux/kref.h>
37#include <linux/nsproxy.h>
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800[diff] [blame]38#include <linux/err.h>
Cedric Le Goaterb119f132006-10-04 02:15:19 -0700[diff] [blame]39#include <asm/atomic.h>
40
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700[diff] [blame]41struct uts_namespace {
42 struct kref kref;
43 struct new_utsname name;
44};
45extern struct uts_namespace init_uts_ns;
46
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800[diff] [blame]47#ifdef CONFIG_UTS_NS
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700[diff] [blame]48static inline void get_uts_ns(struct uts_namespace *ns)
49{
50 kref_get(&ns->kref);
51}
52
Eric W. Biederman213dd262007-07-15 23:41:15 -0700[diff] [blame]53extern struct uts_namespace *copy_utsname(unsigned long flags,
54 struct uts_namespace *ns);
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700[diff] [blame]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}
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800[diff] [blame]61#else
62static inline void get_uts_ns(struct uts_namespace *ns)
63{
64}
65
66static inline void put_uts_ns(struct uts_namespace *ns)
67{
68}
69
70static inline struct uts_namespace *copy_utsname(unsigned long flags,
71 struct uts_namespace *ns)
72{
73 if (flags & CLONE_NEWUTS)
74 return ERR_PTR(-EINVAL);
75
76 return ns;
77}
78#endif
79
Serge E. Hallyn0bdd7aa2006-10-02 02:18:10 -0700[diff] [blame]80static inline struct new_utsname *utsname(void)
81{
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700[diff] [blame]82 return &current->nsproxy->uts_ns->name;
Serge E. Hallyn0bdd7aa2006-10-02 02:18:10 -0700[diff] [blame]83}
84
85static inline struct new_utsname *init_utsname(void)
86{
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700[diff] [blame]87 return &init_uts_ns.name;
Serge E. Hallyn0bdd7aa2006-10-02 02:18:10 -0700[diff] [blame]88}
89
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]90extern struct rw_semaphore uts_sem;
Cedric Le Goaterb119f132006-10-04 02:15:19 -0700[diff] [blame]91
92#endif /* __KERNEL__ */
93
94#endif /* _LINUX_UTSNAME_H */