linux/include/linux/time_namespace.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_TIMENS_H
#define _LINUX_TIMENS_H


#include <linux/sched.h>
#include <linux/nsproxy.h>
#include <linux/ns_common.h>
#include <linux/err.h>
#include <linux/time64.h>

struct user_namespace;
extern struct user_namespace init_user_ns;

struct vm_area_struct;

struct timens_offsets { … };

struct time_namespace { … } __randomize_layout;

extern struct time_namespace init_time_ns;

#ifdef CONFIG_TIME_NS
extern int vdso_join_timens(struct task_struct *task,
			    struct time_namespace *ns);
extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns);

static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
{ … }

struct time_namespace *copy_time_ns(unsigned long flags,
				    struct user_namespace *user_ns,
				    struct time_namespace *old_ns);
void free_time_ns(struct time_namespace *ns);
void timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk);
struct page *find_timens_vvar_page(struct vm_area_struct *vma);

static inline void put_time_ns(struct time_namespace *ns)
{ … }

void proc_timens_show_offsets(struct task_struct *p, struct seq_file *m);

struct proc_timens_offset { … };

int proc_timens_set_offset(struct file *file, struct task_struct *p,
			   struct proc_timens_offset *offsets, int n);

static inline void timens_add_monotonic(struct timespec64 *ts)
{ … }

static inline void timens_add_boottime(struct timespec64 *ts)
{ … }

static inline u64 timens_add_boottime_ns(u64 nsec)
{ … }

static inline void timens_sub_boottime(struct timespec64 *ts)
{ … }

ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim,
				struct timens_offsets *offsets);

static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
{ … }

#else
static inline int vdso_join_timens(struct task_struct *task,
				   struct time_namespace *ns)
{
	return 0;
}

static inline void timens_commit(struct task_struct *tsk,
				 struct time_namespace *ns)
{
}

static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
{
	return NULL;
}

static inline void put_time_ns(struct time_namespace *ns)
{
}

static inline
struct time_namespace *copy_time_ns(unsigned long flags,
				    struct user_namespace *user_ns,
				    struct time_namespace *old_ns)
{
	if (flags & CLONE_NEWTIME)
		return ERR_PTR(-EINVAL);

	return old_ns;
}

static inline void timens_on_fork(struct nsproxy *nsproxy,
				 struct task_struct *tsk)
{
	return;
}

static inline struct page *find_timens_vvar_page(struct vm_area_struct *vma)
{
	return NULL;
}

static inline void timens_add_monotonic(struct timespec64 *ts) { }
static inline void timens_add_boottime(struct timespec64 *ts) { }

static inline u64 timens_add_boottime_ns(u64 nsec)
{
	return nsec;
}

static inline void timens_sub_boottime(struct timespec64 *ts) { }

static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
{
	return tim;
}
#endif

struct vdso_data *arch_get_vdso_data(void *vvar_page);

#endif /* _LINUX_TIMENS_H */