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/*
* Wrapper functions for accessing the file_struct fd array.
*/
#ifndef __LINUX_FILE_H
#define __LINUX_FILE_H
#include <asm/atomic.h>
#include <linux/posix_types.h>
#include <linux/compiler.h>
#include <linux/spinlock.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 BITS_PER_LONG
/*
* Open file table structure
*/
struct files_struct {
atomic_t count;
rwlock_t file_lock; /* Protects all the below members. Nests inside tsk->alloc_lock */
int max_fds;
int max_fdset;
int next_fd;
struct file ** fd; /* current fd array */
fd_set *close_on_exec;
fd_set *open_fds;
fd_set close_on_exec_init;
fd_set open_fds_init;
struct file * fd_array[NR_OPEN_DEFAULT];
};
extern void FASTCALL(__fput(struct file *));
extern void FASTCALL(fput(struct file *));
extern struct file * FASTCALL(fget(unsigned int fd));
extern void FASTCALL(set_close_on_exec(unsigned int fd, int flag));
extern void put_filp(struct file *);
extern int get_unused_fd(void);
extern void FASTCALL(put_unused_fd(unsigned int fd));
static inline struct file * fcheck_files(struct files_struct *files, unsigned int fd)
{
struct file * file = NULL;
if (fd < files->max_fds)
file = files->fd[fd];
return file;
}
/*
* Check whether the specified fd has an open file.
*/
#define fcheck(fd) fcheck_files(current->files, fd)
extern void FASTCALL(fd_install(unsigned int fd, struct file * file));
void FASTCALL(put_files_struct(struct files_struct *fs));
#endif /* __LINUX_FILE_H */
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