servers/vfs/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
  11   struct vnode *filp_vno;
  12
  13   u64_t filp_pos;               /* file position */
  14
  15   /* the following fields are for select() and are owned by the generic
  16    * select() code (i.e., fd-type-specific select() code can't touch these).
  17    */
  18   int filp_selectors;           /* select()ing processes blocking on this fd */
  19   int filp_select_ops;          /* interested in these SEL_* operations */
  20
  21   /* following are for fd-type-specific select() */
  22   int filp_pipe_select_ops;
  23 } filp[NR_FILPS];
  24
  25 #define FILP_CLOSED     0       /* filp_mode: associated device closed */
  26
  27 #define NIL_FILP (struct filp *) 0      /* indicates absence of a filp slot */