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 #ifdef CONFIG_UTS_NS
  52 extern struct uts_namespace *copy_utsname(int flags, struct uts_namespace *ns);
  53 extern void free_uts_ns(struct kref *kref);
  54
  55 static inline void put_uts_ns(struct uts_namespace *ns)
  56 {
  57         kref_put(&ns->kref, free_uts_ns);
  58 }
  59 #else
  60 static inline struct uts_namespace *copy_utsname(int flags,
  61                                                 struct uts_namespace *ns)
  62 {
  63         return ns;
  64 }
  65
  66 static inline void put_uts_ns(struct uts_namespace *ns)
  67 {
  68 }
  69 #endif
  70
  71 static inline struct new_utsname *utsname(void)
  72 {
  73         return &current->nsproxy->uts_ns->name;
  74 }
  75
  76 static inline struct new_utsname *init_utsname(void)
  77 {
  78         return &init_uts_ns.name;
  79 }
  80
  81 extern struct rw_semaphore uts_sem;
  82
  83 #endif /* __KERNEL__ */
  84
  85 #endif /* _LINUX_UTSNAME_H */