1#ifndef _LINUX_UTSNAME_H 2#define _LINUX_UTSNAME_H 3 4#define __OLD_UTS_LEN 8 5 6struct 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 16struct old_utsname { 17 char sysname[65]; 18 char nodename[65]; 19 char release[65]; 20 char version[65]; 21 char machine[65]; 22}; 23 24struct 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 40enum uts_proc { 41 UTS_PROC_OSTYPE, 42 UTS_PROC_OSRELEASE, 43 UTS_PROC_VERSION, 44 UTS_PROC_HOSTNAME, 45 UTS_PROC_DOMAINNAME, 46}; 47 48struct user_namespace; 49extern struct user_namespace init_user_ns; 50 51struct uts_namespace { 52 struct kref kref; 53 struct new_utsname name; 54 struct user_namespace *user_ns; 55}; 56extern struct uts_namespace init_uts_ns; 57 58#ifdef CONFIG_UTS_NS 59static inline void get_uts_ns(struct uts_namespace *ns) 60{ 61 kref_get(&ns->kref); 62} 63 64extern struct uts_namespace *copy_utsname(unsigned long flags, 65 struct task_struct *tsk); 66extern void free_uts_ns(struct kref *kref); 67 68static inline void put_uts_ns(struct uts_namespace *ns) 69{ 70 kref_put(&ns->kref, free_uts_ns); 71} 72#else 73static inline void get_uts_ns(struct uts_namespace *ns) 74{ 75} 76 77static inline void put_uts_ns(struct uts_namespace *ns) 78{ 79} 80 81static inline struct uts_namespace *copy_utsname(unsigned long flags, 82 struct task_struct *tsk) 83{ 84 if (flags & CLONE_NEWUTS) 85 return ERR_PTR(-EINVAL); 86 87 return tsk->nsproxy->uts_ns; 88} 89#endif 90 91#ifdef CONFIG_PROC_SYSCTL 92extern void uts_proc_notify(enum uts_proc proc); 93#else 94static inline void uts_proc_notify(enum uts_proc proc) 95{ 96} 97#endif 98 99static inline struct new_utsname *utsname(void) 100{ 101 return ¤t->nsproxy->uts_ns->name; 102} 103 104static inline struct new_utsname *init_utsname(void) 105{ 106 return &init_uts_ns.name; 107} 108 109extern struct rw_semaphore uts_sem; 110 111#endif /* __KERNEL__ */ 112 113#endif /* _LINUX_UTSNAME_H */ 114