Commit | Line | Data |
---|---|---|
6e210388 DR |
1 | # |
2 | /* | |
3 | */ | |
4 | ||
5 | /* | |
6 | * indirect driver for controlling tty. | |
7 | */ | |
8 | #include "../param.h" | |
9 | #include "../conf.h" | |
10 | #include "../user.h" | |
11 | #include "../tty.h" | |
12 | #include "../proc.h" | |
13 | ||
14 | syopen(dev, flag) | |
15 | { | |
16 | register *tp; | |
17 | ||
18 | if(tp = syttyp()) | |
19 | (*cdevsw[tp->t_dev.d_major].d_open)(tp->t_dev, flag); | |
20 | } | |
21 | ||
22 | syread(dev) | |
23 | { | |
24 | register *tp; | |
25 | ||
26 | if(tp = syttyp()) | |
27 | (*cdevsw[tp->t_dev.d_major].d_read)(tp->t_dev); | |
28 | } | |
29 | ||
30 | sywrite(dev) | |
31 | { | |
32 | register *tp; | |
33 | ||
34 | if(tp = syttyp()) | |
35 | (*cdevsw[tp->t_dev.d_major].d_write)(tp->t_dev); | |
36 | } | |
37 | ||
38 | sysgtty(dev, flag) | |
39 | { | |
40 | register *tp; | |
41 | ||
42 | if(tp = syttyp()) | |
43 | (*cdevsw[tp->t_dev.d_major].d_sgtty)(tp->t_dev, flag); | |
44 | } | |
45 | ||
46 | syttyp() | |
47 | { | |
48 | register tp; | |
49 | ||
50 | tp = u.u_procp->p_ttyp; | |
51 | if(tp == NULL) | |
52 | u.u_error = ENXIO; | |
53 | return(tp); | |
54 | } |