include/linux/utsname.h

   1 #ifndef _LINUX_UTSNAME_H
   2 #define _LINUX_UTSNAME_H
   3
   4 #define __OLD_UTS_LEN 8
   5
   6 struct 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
  16 struct old_utsname {
  17         char sysname[65];
  18         char nodename[65];
  19         char release[65];
  20         char version[65];
  21         char machine[65];
  22 };
  23
  24 struct 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 <asm/atomic.h>
  39
  40 struct uts_namespace {
  41         struct kref kref;
  42         struct new_utsname name;
  43 };
  44 extern struct uts_namespace init_uts_ns;
  45
  46 static inline void get_uts_ns(struct uts_namespace *ns)
  47 {
  48         kref_get(&ns->kref);
  49 }
  50
  51 extern struct uts_namespace *copy_utsname(int flags, struct uts_namespace *ns);
  52 extern void free_uts_ns(struct kref *kref);
  53
  54 static inline void put_uts_ns(struct uts_namespace *ns)
  55 {
  56         kref_put(&ns->kref, free_uts_ns);
  57 }
  58 static inline struct new_utsname *utsname(void)
  59 {
  60         return &current->nsproxy->uts_ns->name;
  61 }
  62
  63 static inline struct new_utsname *init_utsname(void)
  64 {
  65         return &init_uts_ns.name;
  66 }
  67
  68 extern struct rw_semaphore uts_sem;
  69
  70 #endif /* __KERNEL__ */
  71
  72 #endif /* _LINUX_UTSNAME_H */