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 #include <asm/atomic.h> 40 41 struct uts_namespace { 42 struct kref kref; 43 struct new_utsname name; 44 }; 45 extern struct uts_namespace init_uts_ns; 46 47 #ifdef CONFIG_UTS_NS 48 static inline void get_uts_ns(struct uts_namespace *ns) 49 { 50 kref_get(&ns->kref); 51 } 52 53 extern struct uts_namespace *copy_utsname(unsigned long flags, 54 struct uts_namespace *ns); 55 extern void free_uts_ns(struct kref *kref); 56 57 static inline void put_uts_ns(struct uts_namespace *ns) 58 { 59 kref_put(&ns->kref, free_uts_ns); 60 } 61 #else 62 static inline void get_uts_ns(struct uts_namespace *ns) 63 { 64 } 65 66 static inline void put_uts_ns(struct uts_namespace *ns) 67 { 68 } 69 70 static inline struct uts_namespace *copy_utsname(unsigned long flags, 71 struct uts_namespace *ns) 72 { 73 if (flags & CLONE_NEWUTS) 74 return ERR_PTR(-EINVAL); 75 76 return ns; 77 } 78 #endif 79 80 static inline struct new_utsname *utsname(void) 81 { 82 return ¤t->nsproxy->uts_ns->name; 83 } 84 85 static inline struct new_utsname *init_utsname(void) 86 { 87 return &init_uts_ns.name; 88 } 89 90 extern struct rw_semaphore uts_sem; 91 92 #endif /* __KERNEL__ */ 93 94 #endif /* _LINUX_UTSNAME_H */ 95