4865ecf131
This patch defines the uts namespace and some manipulators. Adds the uts namespace to task_struct, and initializes a system-wide init namespace. It leaves a #define for system_utsname so sysctl will compile. This define will be removed in a separate patch. [akpm@osdl.org: build fix, cleanup] Signed-off-by: Serge Hallyn <serue@us.ibm.com> Cc: Kirill Korotaev <dev@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Andrey Savochkin <saw@sw.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
81 lines
1.4 KiB
C
81 lines
1.4 KiB
C
#ifndef _LINUX_UTSNAME_H
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#define _LINUX_UTSNAME_H
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#include <linux/sched.h>
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#include <linux/kref.h>
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#include <linux/nsproxy.h>
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#include <asm/atomic.h>
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#define __OLD_UTS_LEN 8
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struct oldold_utsname {
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char sysname[9];
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char nodename[9];
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char release[9];
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char version[9];
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char machine[9];
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};
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#define __NEW_UTS_LEN 64
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struct old_utsname {
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char sysname[65];
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char nodename[65];
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char release[65];
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char version[65];
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char machine[65];
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};
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struct new_utsname {
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char sysname[65];
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char nodename[65];
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char release[65];
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char version[65];
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char machine[65];
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char domainname[65];
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};
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struct uts_namespace {
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struct kref kref;
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struct new_utsname name;
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};
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extern struct uts_namespace init_uts_ns;
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static inline void get_uts_ns(struct uts_namespace *ns)
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{
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kref_get(&ns->kref);
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}
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#ifdef CONFIG_UTS_NS
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extern int copy_utsname(int flags, struct task_struct *tsk);
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extern void free_uts_ns(struct kref *kref);
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static inline void put_uts_ns(struct uts_namespace *ns)
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{
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kref_put(&ns->kref, free_uts_ns);
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}
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#else
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static inline int copy_utsname(int flags, struct task_struct *tsk)
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{
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return 0;
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}
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static inline void put_uts_ns(struct uts_namespace *ns)
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{
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}
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#endif
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static inline struct new_utsname *utsname(void)
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{
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return ¤t->nsproxy->uts_ns->name;
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}
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static inline struct new_utsname *init_utsname(void)
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{
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return &init_uts_ns.name;
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}
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#define system_utsname init_uts_ns.name
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extern struct rw_semaphore uts_sem;
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#endif
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