linux-stable/include/linux/utsname.h
Dan Smith a7d932af06 utsname.h: make new_utsname fields use the proper length constant
The members of the new_utsname structure are defined with magic numbers
that *should* correspond to the constant __NEW_UTS_LEN+1.  Everywhere
else, code assumes this and uses the constant, so this patch makes the
structure match.

Originally suggested by Serge here:

https://lists.linux-foundation.org/pipermail/containers/2009-March/016258.html

Signed-off-by: Dan Smith <danms@us.ibm.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 19:47:47 -07:00

94 lines
1.7 KiB
C

#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>
#include <asm/atomic.h>
struct uts_namespace {
struct kref kref;
struct new_utsname name;
};
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 */