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 user_namespace; 41 extern struct user_namespace init_user_ns; 42 43 struct uts_namespace { 44 struct kref kref; 45 struct new_utsname name; 46 struct user_namespace *user_ns; 47 }; 48 extern struct uts_namespace init_uts_ns; 49 50 #ifdef CONFIG_UTS_NS 51 static inline void get_uts_ns(struct uts_namespace *ns) 52 { 53 kref_get(&ns->kref); 54 } 55 56 extern struct uts_namespace *copy_utsname(unsigned long flags, 57 struct task_struct *tsk); 58 extern void free_uts_ns(struct kref *kref); 59 60 static inline void put_uts_ns(struct uts_namespace *ns) 61 { 62 kref_put(&ns->kref, free_uts_ns); 63 } 64 #else 65 static inline void get_uts_ns(struct uts_namespace *ns) 66 { 67 } 68 69 static inline void put_uts_ns(struct uts_namespace *ns) 70 { 71 } 72 73 static inline struct uts_namespace *copy_utsname(unsigned long flags, 74 struct task_struct *tsk) 75 { 76 if (flags & CLONE_NEWUTS) 77 return ERR_PTR(-EINVAL); 78 79 return tsk->nsproxy->uts_ns; 80 } 81 #endif 82 83 static inline struct new_utsname *utsname(void) 84 { 85 return ¤t->nsproxy->uts_ns->name; 86 } 87 88 static inline struct new_utsname *init_utsname(void) 89 { 90 return &init_uts_ns.name; 91 } 92 93 extern struct rw_semaphore uts_sem; 94 95 #endif /* __KERNEL__ */ 96 97 #endif /* _LINUX_UTSNAME_H */ 98