[mirror_ubuntu-artful-kernel.git] / include / linux / utsname.h

#ifndef _LINUX_UTSNAME_H
#define _LINUX_UTSNAME_H

#define __OLD_UTS_LEN 8

struct oldold_utsname {
	char sysname[9];
	char nodename[9];
	char release[9];
	char version[9];
	char machine[9];
};

#define __NEW_UTS_LEN 64

struct old_utsname {
	char sysname[65];
	char nodename[65];
	char release[65];
	char version[65];
	char machine[65];
};

struct new_utsname {
	char sysname[__NEW_UTS_LEN + 1];
	char nodename[__NEW_UTS_LEN + 1];
	char release[__NEW_UTS_LEN + 1];
	char version[__NEW_UTS_LEN + 1];
	char machine[__NEW_UTS_LEN + 1];
	char domainname[__NEW_UTS_LEN + 1];
};

#ifdef __KERNEL__

#include <linux/sched.h>
#include <linux/kref.h>
#include <linux/nsproxy.h>
#include <linux/err.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 /* __KERNEL__ */

#endif /* _LINUX_UTSNAME_H */
Commit	Line	Data
	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[__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
	40	enum uts_proc {
	41	UTS_PROC_OSTYPE,
	42	UTS_PROC_OSRELEASE,
	43	UTS_PROC_VERSION,
	44	UTS_PROC_HOSTNAME,
	45	UTS_PROC_DOMAINNAME,
	46	};
	47
	48	struct user_namespace;
	49	extern struct user_namespace init_user_ns;
	50
	51	struct uts_namespace {
	52	struct kref kref;
	53	struct new_utsname name;
	54	struct user_namespace *user_ns;
	55	};
	56	extern struct uts_namespace init_uts_ns;
	57
	58	#ifdef CONFIG_UTS_NS
	59	static inline void get_uts_ns(struct uts_namespace *ns)
	60	{
	61	kref_get(&ns->kref);
	62	}
	63
	64	extern struct uts_namespace *copy_utsname(unsigned long flags,
	65	struct task_struct *tsk);
	66	extern void free_uts_ns(struct kref *kref);
	67
	68	static inline void put_uts_ns(struct uts_namespace *ns)
	69	{
	70	kref_put(&ns->kref, free_uts_ns);
	71	}
	72	#else
	73	static inline void get_uts_ns(struct uts_namespace *ns)
	74	{
	75	}
	76
	77	static inline void put_uts_ns(struct uts_namespace *ns)
	78	{
	79	}
	80
	81	static 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
	92	extern void uts_proc_notify(enum uts_proc proc);
	93	#else
	94	static inline void uts_proc_notify(enum uts_proc proc)
	95	{
	96	}
	97	#endif
	98
	99	static inline struct new_utsname *utsname(void)
	100	{
	101	return &current->nsproxy->uts_ns->name;
	102	}
	103
	104	static inline struct new_utsname *init_utsname(void)
	105	{
	106	return &init_uts_ns.name;
	107	}
	108
	109	extern struct rw_semaphore uts_sem;
	110
	111	#endif /* __KERNEL__ */
	112
	113	#endif /* _LINUX_UTSNAME_H */