linux/include/linux/utsname.h
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   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[__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];
  31};
  32
  33#ifdef __KERNEL__
  34
  35#include <linux/sched.h>
  36#include <linux/kref.h>
  37#include <linux/nsproxy.h>
  38#include <linux/err.h>
  39
  40enum uts_proc {
  41        UTS_PROC_OSTYPE,
  42        UTS_PROC_OSRELEASE,
  43        UTS_PROC_VERSION,
  44        UTS_PROC_HOSTNAME,
  45        UTS_PROC_DOMAINNAME,
  46};
  47
  48struct user_namespace;
  49extern struct user_namespace init_user_ns;
  50
  51struct uts_namespace {
  52        struct kref kref;
  53        struct new_utsname name;
  54        struct user_namespace *user_ns;
  55};
  56extern struct uts_namespace init_uts_ns;
  57
  58#ifdef CONFIG_UTS_NS
  59static inline void get_uts_ns(struct uts_namespace *ns)
  60{
  61        kref_get(&ns->kref);
  62}
  63
  64extern struct uts_namespace *copy_utsname(unsigned long flags,
  65                                          struct task_struct *tsk);
  66extern void free_uts_ns(struct kref *kref);
  67
  68static inline void put_uts_ns(struct uts_namespace *ns)
  69{
  70        kref_put(&ns->kref, free_uts_ns);
  71}
  72#else
  73static inline void get_uts_ns(struct uts_namespace *ns)
  74{
  75}
  76
  77static inline void put_uts_ns(struct uts_namespace *ns)
  78{
  79}
  80
  81static inline struct uts_namespace *copy_utsname(unsigned long flags,
  82                                                 struct task_struct *tsk)
  83{
  84        if (flags & CLONE_NEWUTS)
  85                return ERR_PTR(-EINVAL);
  86
  87        return tsk->nsproxy->uts_ns;
  88}
  89#endif
  90
  91#ifdef CONFIG_PROC_SYSCTL
  92extern void uts_proc_notify(enum uts_proc proc);
  93#else
  94static inline void uts_proc_notify(enum uts_proc proc)
  95{
  96}
  97#endif
  98
  99static inline struct new_utsname *utsname(void)
 100{
 101        return &current->nsproxy->uts_ns->name;
 102}
 103
 104static inline struct new_utsname *init_utsname(void)
 105{
 106        return &init_uts_ns.name;
 107}
 108
 109extern struct rw_semaphore uts_sem;
 110
 111#endif /* __KERNEL__ */
 112
 113#endif /* _LINUX_UTSNAME_H */
 114
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