utsname.h

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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;
};
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 task_struct *tsk);
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 task_struct *tsk)
{
    if (flags & CLONE_NEWUTS)
        return ERR_PTR(-EINVAL);

    return tsk->nsproxy->uts_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 */