include/linux/proc_fs.h

/*
 * The proc filesystem constants/structures
 */
#ifndef _LINUX_PROC_FS_H
#define _LINUX_PROC_FS_H

#include <linux/types.h>
#include <linux/fs.h>

struct proc_dir_entry;

#ifdef CONFIG_PROC_FS

extern void proc_root_init(void);
extern void proc_flush_task(struct task_struct *);

extern struct proc_dir_entry *proc_symlink(const char *,
		struct proc_dir_entry *, const char *);
extern struct proc_dir_entry *proc_mkdir(const char *, struct proc_dir_entry *);
extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t,
					      struct proc_dir_entry *, void *);
extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t,
					      struct proc_dir_entry *);
 
extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
					       struct proc_dir_entry *,
					       const struct file_operations *,
					       void *);

static inline struct proc_dir_entry *proc_create(
	const char *name, umode_t mode, struct proc_dir_entry *parent,
	const struct file_operations *proc_fops)
{
	return proc_create_data(name, mode, parent, proc_fops, NULL);
}

extern void proc_set_size(struct proc_dir_entry *, loff_t);
extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
extern void *PDE_DATA(const struct inode *);
extern void *proc_get_parent_data(const struct inode *);
extern void proc_remove(struct proc_dir_entry *);
extern void remove_proc_entry(const char *, struct proc_dir_entry *);
extern int remove_proc_subtree(const char *, struct proc_dir_entry *);
extern struct pid *tgid_pidfd_to_pid(const struct file *file);

#else /* CONFIG_PROC_FS */

static inline void proc_root_init(void)
{
}

static inline void proc_flush_task(struct task_struct *task)
{
}

static inline struct proc_dir_entry *proc_symlink(const char *name,
		struct proc_dir_entry *parent,const char *dest) { return NULL;}
static inline struct proc_dir_entry *proc_mkdir(const char *name,
	struct proc_dir_entry *parent) {return NULL;}
static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
	umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
	umode_t mode, struct proc_dir_entry *parent) { return NULL; }
#define proc_create(name, mode, parent, proc_fops) ({NULL;})
#define proc_create_data(name, mode, parent, proc_fops, data) ({NULL;})

static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
static inline void *PDE_DATA(const struct inode *inode) {BUG(); return NULL;}
static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); return NULL; }

static inline void proc_remove(struct proc_dir_entry *de) {}
#define remove_proc_entry(name, parent) do {} while (0)
static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) { return 0; }

static inline struct pid *tgid_pidfd_to_pid(const struct file *file)
{
	return ERR_PTR(-EBADF);
}

#endif /* CONFIG_PROC_FS */

#ifdef CONFIG_PROC_UID
extern void proc_register_uid(kuid_t uid);
#else
static inline void proc_register_uid(kuid_t uid) {}
#endif

struct net;

static inline struct proc_dir_entry *proc_net_mkdir(
	struct net *net, const char *name, struct proc_dir_entry *parent)
{
	return proc_mkdir_data(name, 0, parent, net);
}

#endif /* _LINUX_PROC_FS_H */