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