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 user_namespace;
  41extern struct user_namespace init_user_ns;
  42
  43struct uts_namespace {
  44        struct kref kref;
  45        struct new_utsname name;
  46        struct user_namespace *user_ns;
  47};
  48extern struct uts_namespace init_uts_ns;
  49
  50#ifdef CONFIG_UTS_NS
  51static inline void get_uts_ns(struct uts_namespace *ns)
  52{
  53        kref_get(&ns->kref);
  54}
  55
  56extern struct uts_namespace *copy_utsname(unsigned long flags,
  57                                          struct task_struct *tsk);
  58extern 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}
  64#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,
  74                                                 struct task_struct *tsk)
  75{
  76        if (flags & CLONE_NEWUTS)
  77                return ERR_PTR(-EINVAL);
  78
  79        return tsk->nsproxy->uts_ns;
  80}
  81#endif
  82
  83static inline struct new_utsname *utsname(void)
  84{
  85        return &current->nsproxy->uts_ns->name;
  86}
  87
  88static inline struct new_utsname *init_utsname(void)
  89{
  90        return &init_uts_ns.name;
  91}
  92
  93extern struct rw_semaphore uts_sem;
  94
  95#endif /* __KERNEL__ */
  96
  97#endif /* _LINUX_UTSNAME_H */
  98