servers/mfs/file.h

   1 /* This is the filp table.  It is an intermediary between file descriptors and
   2  * inodes.  A slot is free if filp_count == 0.
   3  */
   4
   5 EXTERN struct filp {
   6   mode_t filp_mode;             /* RW bits, telling how file is opened */
   7   int filp_flags;               /* flags from open and fcntl */
   8   int filp_count;               /* how many file descriptors share this slot?*/
   9   struct inode *filp_ino;       /* pointer to the inode */
  10   off_t filp_pos;               /* file position */
  11
  12   /* the following fields are for select() and are owned by the generic
  13    * select() code (i.e., fd-type-specific select() code can't touch these).
  14    */
  15   int filp_selectors;           /* select()ing processes blocking on this fd */
  16   int filp_select_ops;          /* interested in these SEL_* operations */
  17
  18   /* following are for fd-type-specific select() */
  19   int filp_pipe_select_ops;
  20 } filp[NR_FILPS];
  21
  22 #define FILP_CLOSED     0       /* filp_mode: associated device closed */
  23
  24 #define NIL_FILP (struct filp *) 0      /* indicates absence of a filp slot */