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kernel/linux-imx6_3.14.28/include/linux/utsname.h 1.61 KB
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  #ifndef _LINUX_UTSNAME_H
  #define _LINUX_UTSNAME_H
  
  
  #include <linux/sched.h>
  #include <linux/kref.h>
  #include <linux/nsproxy.h>
  #include <linux/err.h>
  #include <uapi/linux/utsname.h>
  
  enum uts_proc {
  	UTS_PROC_OSTYPE,
  	UTS_PROC_OSRELEASE,
  	UTS_PROC_VERSION,
  	UTS_PROC_HOSTNAME,
  	UTS_PROC_DOMAINNAME,
  };
  
  struct user_namespace;
  extern struct user_namespace init_user_ns;
  
  struct uts_namespace {
  	struct kref kref;
  	struct new_utsname name;
  	struct user_namespace *user_ns;
  	unsigned int proc_inum;
  };
  extern struct uts_namespace init_uts_ns;
  
  #ifdef CONFIG_UTS_NS
  static inline void get_uts_ns(struct uts_namespace *ns)
  {
  	kref_get(&ns->kref);
  }
  
  extern struct uts_namespace *copy_utsname(unsigned long flags,
  	struct user_namespace *user_ns, struct uts_namespace *old_ns);
  extern void free_uts_ns(struct kref *kref);
  
  static inline void put_uts_ns(struct uts_namespace *ns)
  {
  	kref_put(&ns->kref, free_uts_ns);
  }
  #else
  static inline void get_uts_ns(struct uts_namespace *ns)
  {
  }
  
  static inline void put_uts_ns(struct uts_namespace *ns)
  {
  }
  
  static inline struct uts_namespace *copy_utsname(unsigned long flags,
  	struct user_namespace *user_ns, struct uts_namespace *old_ns)
  {
  	if (flags & CLONE_NEWUTS)
  		return ERR_PTR(-EINVAL);
  
  	return old_ns;
  }
  #endif
  
  #ifdef CONFIG_PROC_SYSCTL
  extern void uts_proc_notify(enum uts_proc proc);
  #else
  static inline void uts_proc_notify(enum uts_proc proc)
  {
  }
  #endif
  
  static inline struct new_utsname *utsname(void)
  {
  	return &current->nsproxy->uts_ns->name;
  }
  
  static inline struct new_utsname *init_utsname(void)
  {
  	return &init_uts_ns.name;
  }
  
  extern struct rw_semaphore uts_sem;
  
  #endif /* _LINUX_UTSNAME_H */