LXR linux-old/include/linux/file.h

   1/*
   2 * Wrapper functions for accessing the file_struct fd array.
   3 */
   4
   5#ifndef __LINUX_FILE_H
   6#define __LINUX_FILE_H
   7
   8extern void FASTCALL(fput(struct file *));
   9extern struct file * FASTCALL(fget(unsigned int fd));
  10 
  11static inline int get_close_on_exec(unsigned int fd)
  12{
  13        struct files_struct *files = current->files;
  14        int res;
  15        read_lock(&files->file_lock);
  16        res = FD_ISSET(fd, files->close_on_exec);
  17        read_unlock(&files->file_lock);
  18        return res;
  19}
  20
  21static inline void set_close_on_exec(unsigned int fd, int flag)
  22{
  23        struct files_struct *files = current->files;
  24        write_lock(&files->file_lock);
  25        if (flag)
  26                FD_SET(fd, files->close_on_exec);
  27        else
  28                FD_CLR(fd, files->close_on_exec);
  29        write_unlock(&files->file_lock);
  30}
  31
  32static inline struct file * fcheck_files(struct files_struct *files, unsigned int fd)
  33{
  34        struct file * file = NULL;
  35
  36        if (fd < files->max_fds)
  37                file = files->fd[fd];
  38        return file;
  39}
  40
  41/*
  42 * Check whether the specified fd has an open file.
  43 */
  44static inline struct file * fcheck(unsigned int fd)
  45{
  46        struct file * file = NULL;
  47        struct files_struct *files = current->files;
  48
  49        if (fd < files->max_fds)
  50                file = files->fd[fd];
  51        return file;
  52}
  53
  54extern void put_filp(struct file *);
  55
  56extern int get_unused_fd(void);
  57
  58static inline void __put_unused_fd(struct files_struct *files, unsigned int fd)
  59{
  60        FD_CLR(fd, files->open_fds);
  61        if (fd < files->next_fd)
  62                files->next_fd = fd;
  63}
  64
  65static inline void put_unused_fd(unsigned int fd)
  66{
  67        struct files_struct *files = current->files;
  68
  69        write_lock(&files->file_lock);
  70        __put_unused_fd(files, fd);
  71        write_unlock(&files->file_lock);
  72}
  73
  74void fd_install(unsigned int fd, struct file * file);
  75void put_files_struct(struct files_struct *fs);
  76
  77#endif /* __LINUX_FILE_H */
  78