FreeBSD/Linux Kernel Cross Reference
sys/servers/fs/file.h

     /* This is the filp table.  It is an intermediary between file descriptors and
      * inodes.  A slot is free if filp_count == 0.
      */
     
     EXTERN struct filp {
       mode_t filp_mode;             /* RW bits, telling how file is opened */
       int filp_flags;               /* flags from open and fcntl */
       int filp_count;               /* how many file descriptors share this slot?*/
       struct inode *filp_ino;       /* pointer to the inode */
      off_t filp_pos;               /* file position */
    
      /* the following fields are for select() and are owned by the generic
       * select() code (i.e., fd-type-specific select() code can't touch these).
       */
      int filp_selectors;           /* select()ing processes blocking on this fd */
      int filp_select_ops;          /* interested in these SEL_* operations */
    
      /* following are for fd-type-specific select() */
      int filp_pipe_select_ops;
    } filp[NR_FILPS];
    
    #define FILP_CLOSED     0       /* filp_mode: associated device closed */
    
    #define NIL_FILP (struct filp *) 0      /* indicates absence of a filp slot */

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