[linux.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>

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 uts_namespace *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 uts_namespace *ns)
{
	if (flags & CLONE_NEWUTS)
		return ERR_PTR(-EINVAL);

	return ns;
}
#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
1da177e4 LT	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 {
a7d932af DS	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];
1da177e4 LT	31	};
1da177e4 LT	32
b119f13f CLG	33	#ifdef __KERNEL__
	34
	35	#include <linux/sched.h>
	36	#include <linux/kref.h>
	37	#include <linux/nsproxy.h>
58bfdd6d	38	#include <linux/err.h>
b119f13f	39
59607db3 SH	40	struct user_namespace;
	41	extern struct user_namespace init_user_ns;
	42
4865ecf1 SH	43	struct uts_namespace {
	44	struct kref kref;
	45	struct new_utsname name;
59607db3	46	struct user_namespace *user_ns;
4865ecf1 SH	47	};
	48	extern struct uts_namespace init_uts_ns;
	49
58bfdd6d	50	#ifdef CONFIG_UTS_NS
4865ecf1 SH	51	static inline void get_uts_ns(struct uts_namespace *ns)
	52	{
	53	kref_get(&ns->kref);
	54	}
	55
213dd266 EB	56	extern struct uts_namespace *copy_utsname(unsigned long flags,
213dd266 EB	57	struct uts_namespace *ns);
4865ecf1 SH	58	extern void free_uts_ns(struct kref *kref);
	59
	60	static inline void put_uts_ns(struct uts_namespace *ns)
	61	{
	62	kref_put(&ns->kref, free_uts_ns);
	63	}
58bfdd6d PE	64	#else
	65	static inline void get_uts_ns(struct uts_namespace *ns)
	66	{
	67	}
	68
	69	static inline void put_uts_ns(struct uts_namespace *ns)
	70	{
	71	}
	72
	73	static inline struct uts_namespace *copy_utsname(unsigned long flags,
	74	struct uts_namespace *ns)
	75	{
	76	if (flags & CLONE_NEWUTS)
	77	return ERR_PTR(-EINVAL);
	78
	79	return ns;
	80	}
	81	#endif
	82
0bdd7aab SH	83	static inline struct new_utsname *utsname(void)
0bdd7aab SH	84	{
4865ecf1	85	return &current->nsproxy->uts_ns->name;
0bdd7aab SH	86	}
	87
	88	static inline struct new_utsname *init_utsname(void)
	89	{
4865ecf1	90	return &init_uts_ns.name;
0bdd7aab SH	91	}
0bdd7aab SH	92
1da177e4	93	extern struct rw_semaphore uts_sem;
b119f13f CLG	94
	95	#endif /* __KERNEL__ */
	96
	97	#endif /* _LINUX_UTSNAME_H */