UNIX 6th Ed. - /usr/sys/conf.h

   1: /*
   2:  * Used to dissect integer device code
   3:  * into major (driver designation) and
   4:  * minor (driver parameter) parts.
   5:  */
   6: struct
   7: {
   8:     char    d_minor;
   9:     char    d_major;
  10: };
  11: 
  12: /*
  13:  * Declaration of block device
  14:  * switch. Each entry (row) is
  15:  * the only link between the
  16:  * main unix code and the driver.
  17:  * The initialization of the
  18:  * device switches is in the
  19:  * file conf.c.
  20:  */
  21: struct  bdevsw
  22: {
  23:     int (*d_open)();
  24:     int (*d_close)();
  25:     int (*d_strategy)();
  26:     int *d_tab;
  27: } bdevsw[];
  28: 
  29: /*
  30:  * Nblkdev is the number of entries
  31:  * (rows) in the block switch. It is
  32:  * set in binit/bio.c by making
  33:  * a pass over the switch.
  34:  * Used in bounds checking on major
  35:  * device numbers.
  36:  */
  37: int nblkdev;
  38: 
  39: /*
  40:  * Character device switch.
  41:  */
  42: struct  cdevsw
  43: {
  44:     int (*d_open)();
  45:     int (*d_close)();
  46:     int (*d_read)();
  47:     int (*d_write)();
  48:     int (*d_sgtty)();
  49: } cdevsw[];
  50: 
  51: /*
  52:  * Number of character switch entries.
  53:  * Set by cinit/tty.c
  54:  */
  55: int nchrdev;

Defined variables

Defined struct's

Usage of this include