LXR linux/include/linux/utsname.h

   1#ifndef _LINUX_UTSNAME_H
   2#define _LINUX_UTSNAME_H
   3
   4
   5#include <linux/sched.h>
   6#include <linux/kref.h>
   7#include <linux/nsproxy.h>
   8#include <linux/ns_common.h>
   9#include <linux/err.h>
  10#include <uapi/linux/utsname.h>
  11
  12enum uts_proc {
  13        UTS_PROC_OSTYPE,
  14        UTS_PROC_OSRELEASE,
  15        UTS_PROC_VERSION,
  16        UTS_PROC_HOSTNAME,
  17        UTS_PROC_DOMAINNAME,
  18};
  19
  20struct user_namespace;
  21extern struct user_namespace init_user_ns;
  22
  23struct uts_namespace {
  24        struct kref kref;
  25        struct new_utsname name;
  26        struct user_namespace *user_ns;
  27        struct ns_common ns;
  28};
  29extern struct uts_namespace init_uts_ns;
  30
  31#ifdef CONFIG_UTS_NS
  32static inline void get_uts_ns(struct uts_namespace *ns)
  33{
  34        kref_get(&ns->kref);
  35}
  36
  37extern struct uts_namespace *copy_utsname(unsigned long flags,
  38        struct user_namespace *user_ns, struct uts_namespace *old_ns);
  39extern void free_uts_ns(struct kref *kref);
  40
  41static inline void put_uts_ns(struct uts_namespace *ns)
  42{
  43        kref_put(&ns->kref, free_uts_ns);
  44}
  45#else
  46static inline void get_uts_ns(struct uts_namespace *ns)
  47{
  48}
  49
  50static inline void put_uts_ns(struct uts_namespace *ns)
  51{
  52}
  53
  54static inline struct uts_namespace *copy_utsname(unsigned long flags,
  55        struct user_namespace *user_ns, struct uts_namespace *old_ns)
  56{
  57        if (flags & CLONE_NEWUTS)
  58                return ERR_PTR(-EINVAL);
  59
  60        return old_ns;
  61}
  62#endif
  63
  64#ifdef CONFIG_PROC_SYSCTL
  65extern void uts_proc_notify(enum uts_proc proc);
  66#else
  67static inline void uts_proc_notify(enum uts_proc proc)
  68{
  69}
  70#endif
  71
  72static inline struct new_utsname *utsname(void)
  73{
  74        return &current->nsproxy->uts_ns->name;
  75}
  76
  77static inline struct new_utsname *init_utsname(void)
  78{
  79        return &init_uts_ns.name;
  80}
  81
  82extern struct rw_semaphore uts_sem;
  83
  84#endif /* _LINUX_UTSNAME_H */
  85