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 int unshare_utsname(unsigned long unshare_flags, 53 struct uts_namespace **new_uts); 54 extern int copy_utsname(int flags, struct task_struct *tsk); 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 int unshare_utsname(unsigned long unshare_flags, 63 struct uts_namespace **new_uts) 64 { 65 if (unshare_flags & CLONE_NEWUTS) 66 return -EINVAL; 67 68 return 0; 69 } 70 71 static inline int copy_utsname(int flags, struct task_struct *tsk) 72 { 73 if (flags & CLONE_NEWUTS) 74 return -EINVAL; 75 return 0; 76 } 77 static inline void put_uts_ns(struct uts_namespace *ns) 78 { 79 } 80 #endif 81 82 static inline struct new_utsname *utsname(void) 83 { 84 return ¤t->nsproxy->uts_ns->name; 85 } 86 87 static inline struct new_utsname *init_utsname(void) 88 { 89 return &init_uts_ns.name; 90 } 91 92 extern struct rw_semaphore uts_sem; 93 94 #endif /* __KERNEL__ */ 95 96 #endif /* _LINUX_UTSNAME_H */ 97