1 #ifndef _LINUX_UTSNAME_H 2 #define _LINUX_UTSNAME_H 3 4 #include <linux/sched.h> 5 #include <linux/kref.h> 6 #include <linux/nsproxy.h> 7 #include <asm/atomic.h> 8 9 #define __OLD_UTS_LEN 8 10 11 struct oldold_utsname { 12 char sysname[9]; 13 char nodename[9]; 14 char release[9]; 15 char version[9]; 16 char machine[9]; 17 }; 18 19 #define __NEW_UTS_LEN 64 20 21 struct old_utsname { 22 char sysname[65]; 23 char nodename[65]; 24 char release[65]; 25 char version[65]; 26 char machine[65]; 27 }; 28 29 struct new_utsname { 30 char sysname[65]; 31 char nodename[65]; 32 char release[65]; 33 char version[65]; 34 char machine[65]; 35 char domainname[65]; 36 }; 37 38 struct uts_namespace { 39 struct kref kref; 40 struct new_utsname name; 41 }; 42 extern struct uts_namespace init_uts_ns; 43 44 static inline void get_uts_ns(struct uts_namespace *ns) 45 { 46 kref_get(&ns->kref); 47 } 48 49 #ifdef CONFIG_UTS_NS 50 extern int unshare_utsname(unsigned long unshare_flags, 51 struct uts_namespace **new_uts); 52 extern int copy_utsname(int flags, struct task_struct *tsk); 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 int unshare_utsname(unsigned long unshare_flags, 61 struct uts_namespace **new_uts) 62 { 63 if (unshare_flags & CLONE_NEWUTS) 64 return -EINVAL; 65 66 return 0; 67 } 68 69 static inline int copy_utsname(int flags, struct task_struct *tsk) 70 { 71 return 0; 72 } 73 static inline void put_uts_ns(struct uts_namespace *ns) 74 { 75 } 76 #endif 77 78 static inline struct new_utsname *utsname(void) 79 { 80 return ¤t->nsproxy->uts_ns->name; 81 } 82 83 static inline struct new_utsname *init_utsname(void) 84 { 85 return &init_uts_ns.name; 86 } 87 88 extern struct rw_semaphore uts_sem; 89 #endif 90