linux/include/linux/fdtable.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * descriptor table internals; you almost certainly want file.h instead.
 */

#ifndef __LINUX_FDTABLE_H
#define __LINUX_FDTABLE_H

#include <linux/posix_types.h>
#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/nospec.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/fs.h>

#include <linux/atomic.h>

/*
 * The default fd array needs to be at least BITS_PER_LONG,
 * as this is the granularity returned by copy_fdset().
 */
#define NR_OPEN_DEFAULT …
#define NR_OPEN_MAX …

struct fdtable { … };

/*
 * Open file table structure
 */
struct files_struct { … };

struct file_operations;
struct vfsmount;
struct dentry;

#define rcu_dereference_check_fdtable(files, fdtfd) …

#define files_fdtable(files) …

/*
 * The caller must ensure that fd table isn't shared or hold rcu or file lock
 */
static inline struct file *files_lookup_fd_raw(struct files_struct *files, unsigned int fd)
{ … }

static inline struct file *files_lookup_fd_locked(struct files_struct *files, unsigned int fd)
{ … }

struct file *lookup_fdget_rcu(unsigned int fd);
struct file *task_lookup_fdget_rcu(struct task_struct *task, unsigned int fd);
struct file *task_lookup_next_fdget_rcu(struct task_struct *task, unsigned int *fd);

static inline bool close_on_exec(unsigned int fd, const struct files_struct *files)
{ … }

struct task_struct;

void put_files_struct(struct files_struct *fs);
int unshare_files(void);
struct files_struct *dup_fd(struct files_struct *, unsigned, int *) __latent_entropy;
void do_close_on_exec(struct files_struct *);
int iterate_fd(struct files_struct *, unsigned,
		int (*)(const void *, struct file *, unsigned),
		const void *);

extern int close_fd(unsigned int fd);
extern int __close_range(unsigned int fd, unsigned int max_fd, unsigned int flags);
extern struct file *file_close_fd(unsigned int fd);
extern int unshare_fd(unsigned long unshare_flags, unsigned int max_fds,
		      struct files_struct **new_fdp);

extern struct kmem_cache *files_cachep;

#endif /* __LINUX_FDTABLE_H */