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TOMOYO Linux Cross Reference
Linux/include/linux/utsname.h

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  1 #ifndef _LINUX_UTSNAME_H
  2 #define _LINUX_UTSNAME_H
  3 
  4 
  5 #include <linux/sched.h>
  6 #include <linux/kref.h>
  7 #include <linux/nsproxy.h>
  8 #include <linux/err.h>
  9 #include <uapi/linux/utsname.h>
 10 
 11 enum uts_proc {
 12         UTS_PROC_OSTYPE,
 13         UTS_PROC_OSRELEASE,
 14         UTS_PROC_VERSION,
 15         UTS_PROC_HOSTNAME,
 16         UTS_PROC_DOMAINNAME,
 17 };
 18 
 19 struct user_namespace;
 20 extern struct user_namespace init_user_ns;
 21 
 22 struct uts_namespace {
 23         struct kref kref;
 24         struct new_utsname name;
 25         struct user_namespace *user_ns;
 26         unsigned int proc_inum;
 27 };
 28 extern struct uts_namespace init_uts_ns;
 29 
 30 #ifdef CONFIG_UTS_NS
 31 static inline void get_uts_ns(struct uts_namespace *ns)
 32 {
 33         kref_get(&ns->kref);
 34 }
 35 
 36 extern struct uts_namespace *copy_utsname(unsigned long flags,
 37         struct user_namespace *user_ns, struct uts_namespace *old_ns);
 38 extern void free_uts_ns(struct kref *kref);
 39 
 40 static inline void put_uts_ns(struct uts_namespace *ns)
 41 {
 42         kref_put(&ns->kref, free_uts_ns);
 43 }
 44 #else
 45 static inline void get_uts_ns(struct uts_namespace *ns)
 46 {
 47 }
 48 
 49 static inline void put_uts_ns(struct uts_namespace *ns)
 50 {
 51 }
 52 
 53 static inline struct uts_namespace *copy_utsname(unsigned long flags,
 54         struct user_namespace *user_ns, struct uts_namespace *old_ns)
 55 {
 56         if (flags & CLONE_NEWUTS)
 57                 return ERR_PTR(-EINVAL);
 58 
 59         return old_ns;
 60 }
 61 #endif
 62 
 63 #ifdef CONFIG_PROC_SYSCTL
 64 extern void uts_proc_notify(enum uts_proc proc);
 65 #else
 66 static inline void uts_proc_notify(enum uts_proc proc)
 67 {
 68 }
 69 #endif
 70 
 71 static inline struct new_utsname *utsname(void)
 72 {
 73         return &current->nsproxy->uts_ns->name;
 74 }
 75 
 76 static inline struct new_utsname *init_utsname(void)
 77 {
 78         return &init_uts_ns.name;
 79 }
 80 
 81 extern struct rw_semaphore uts_sem;
 82 
 83 #endif /* _LINUX_UTSNAME_H */
 84 

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