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f1ecf06854
Adding support for poll() in sysctl fs allows userspace to receive notifications of changes in sysctl entries. This adds a infrastructure to allow files in sysctl fs to be pollable and implements it for hostname and domainname. [akpm@linux-foundation.org: s/declare/define/ for definitions] Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi> Cc: Greg KH <gregkh@suse.de> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
114 lines
2.1 KiB
C
114 lines
2.1 KiB
C
#ifndef _LINUX_UTSNAME_H
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#define _LINUX_UTSNAME_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[__NEW_UTS_LEN + 1];
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char nodename[__NEW_UTS_LEN + 1];
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char release[__NEW_UTS_LEN + 1];
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char version[__NEW_UTS_LEN + 1];
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char machine[__NEW_UTS_LEN + 1];
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char domainname[__NEW_UTS_LEN + 1];
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};
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#ifdef __KERNEL__
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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 <linux/err.h>
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enum uts_proc {
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UTS_PROC_OSTYPE,
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UTS_PROC_OSRELEASE,
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UTS_PROC_VERSION,
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UTS_PROC_HOSTNAME,
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UTS_PROC_DOMAINNAME,
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};
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struct user_namespace;
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extern struct user_namespace init_user_ns;
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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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struct user_namespace *user_ns;
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};
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extern struct uts_namespace init_uts_ns;
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#ifdef CONFIG_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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extern struct uts_namespace *copy_utsname(unsigned long flags,
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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 void get_uts_ns(struct uts_namespace *ns)
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{
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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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static inline struct uts_namespace *copy_utsname(unsigned long flags,
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struct task_struct *tsk)
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{
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if (flags & CLONE_NEWUTS)
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return ERR_PTR(-EINVAL);
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return tsk->nsproxy->uts_ns;
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}
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#endif
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#ifdef CONFIG_PROC_SYSCTL
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extern void uts_proc_notify(enum uts_proc proc);
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#else
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static inline void uts_proc_notify(enum uts_proc proc)
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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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extern struct rw_semaphore uts_sem;
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#endif /* __KERNEL__ */
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#endif /* _LINUX_UTSNAME_H */
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