projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 0edd06b4 KT |
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; |