LXR linux/include/linux/utsname.h

   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 <linux/err.h>
  39#include <asm/atomic.h>
  40
  41struct uts_namespace {
  42        struct kref kref;
  43        struct new_utsname name;
  44};
  45extern struct uts_namespace init_uts_ns;
  46
  47#ifdef CONFIG_UTS_NS
  48static inline void get_uts_ns(struct uts_namespace *ns)
  49{
  50        kref_get(&ns->kref);
  51}
  52
  53extern struct uts_namespace *copy_utsname(unsigned long flags,
  54                                        struct uts_namespace *ns);
  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 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
  80static inline struct new_utsname *utsname(void)
  81{
  82        return &current->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 */
  95