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[__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
  40struct uts_namespace {
  41        struct kref kref;
  42        struct new_utsname name;
  43};
  44extern struct uts_namespace init_uts_ns;
  45
  46#ifdef CONFIG_UTS_NS
  47static inline void get_uts_ns(struct uts_namespace *ns)
  48{
  49        kref_get(&ns->kref);
  50}
  51
  52extern struct uts_namespace *copy_utsname(unsigned long flags,
  53                                        struct uts_namespace *ns);
  54extern void free_uts_ns(struct kref *kref);
  55
  56static inline void put_uts_ns(struct uts_namespace *ns)
  57{
  58        kref_put(&ns->kref, free_uts_ns);
  59}
  60#else
  61static inline void get_uts_ns(struct uts_namespace *ns)
  62{
  63}
  64
  65static inline void put_uts_ns(struct uts_namespace *ns)
  66{
  67}
  68
  69static inline struct uts_namespace *copy_utsname(unsigned long flags,
  70                                        struct uts_namespace *ns)
  71{
  72        if (flags & CLONE_NEWUTS)
  73                return ERR_PTR(-EINVAL);
  74
  75        return ns;
  76}
  77#endif
  78
  79static inline struct new_utsname *utsname(void)
  80{
  81        return &current->nsproxy->uts_ns->name;
  82}
  83
  84static inline struct new_utsname *init_utsname(void)
  85{
  86        return &init_uts_ns.name;
  87}
  88
  89extern struct rw_semaphore uts_sem;
  90
  91#endif /* __KERNEL__ */
  92
  93#endif /* _LINUX_UTSNAME_H */
  94