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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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 {
Dan Smitha7d932a2009-06-16 15:33:33 -070025 char sysname[__NEW_UTS_LEN + 1];
26 char nodename[__NEW_UTS_LEN + 1];
27 char release[__NEW_UTS_LEN + 1];
28 char version[__NEW_UTS_LEN + 1];
29 char machine[__NEW_UTS_LEN + 1];
30 char domainname[__NEW_UTS_LEN + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070031};
32
Cedric Le Goaterb119f132006-10-04 02:15:19 -070033#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 -080038#include <linux/err.h>
Cedric Le Goaterb119f132006-10-04 02:15:19 -070039
Serge E. Hallyn59607db2011-03-23 16:43:16 -070040struct user_namespace;
41extern struct user_namespace init_user_ns;
42
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -070043struct uts_namespace {
44 struct kref kref;
45 struct new_utsname name;
Serge E. Hallyn59607db2011-03-23 16:43:16 -070046 struct user_namespace *user_ns;
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -070047};
48extern struct uts_namespace init_uts_ns;
49
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -080050#ifdef CONFIG_UTS_NS
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -070051static inline void get_uts_ns(struct uts_namespace *ns)
52{
53 kref_get(&ns->kref);
54}
55
Eric W. Biederman213dd262007-07-15 23:41:15 -070056extern struct uts_namespace *copy_utsname(unsigned long flags,
Serge E. Hallynbb96a6f2011-03-23 16:43:18 -070057 struct task_struct *tsk);
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -070058extern void free_uts_ns(struct kref *kref);
59
60static inline void put_uts_ns(struct uts_namespace *ns)
61{
62 kref_put(&ns->kref, free_uts_ns);
63}
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -080064#else
65static inline void get_uts_ns(struct uts_namespace *ns)
66{
67}
68
69static inline void put_uts_ns(struct uts_namespace *ns)
70{
71}
72
73static inline struct uts_namespace *copy_utsname(unsigned long flags,
Serge E. Hallynbb96a6f2011-03-23 16:43:18 -070074 struct task_struct *tsk)
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -080075{
76 if (flags & CLONE_NEWUTS)
77 return ERR_PTR(-EINVAL);
78
Serge E. Hallynbb96a6f2011-03-23 16:43:18 -070079 return tsk->nsproxy->uts_ns;
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -080080}
81#endif
82
Serge E. Hallyn0bdd7aa2006-10-02 02:18:10 -070083static inline struct new_utsname *utsname(void)
84{
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -070085 return &current->nsproxy->uts_ns->name;
Serge E. Hallyn0bdd7aa2006-10-02 02:18:10 -070086}
87
88static inline struct new_utsname *init_utsname(void)
89{
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -070090 return &init_uts_ns.name;
Serge E. Hallyn0bdd7aa2006-10-02 02:18:10 -070091}
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093extern struct rw_semaphore uts_sem;
Cedric Le Goaterb119f132006-10-04 02:15:19 -070094
95#endif /* __KERNEL__ */
96
97#endif /* _LINUX_UTSNAME_H */