projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 4460d508 | 1 | /* tty_tty.c 4.2 %G% */ |
| 63c57592 BJ |
2 | |
| 3 | /* | |
| 4 | * indirect driver for controlling tty. | |
| 5 | */ | |
| 6 | #include "../h/param.h" | |
| 7 | #include "../h/systm.h" | |
| 8 | #include "../h/conf.h" | |
| 9 | #include "../h/dir.h" | |
| 10 | #include "../h/user.h" | |
| 11 | #include "../h/tty.h" | |
| 12 | #include "../h/proc.h" | |
| 13 | ||
| 14 | /*ARGSUSED*/ | |
| 15 | syopen(dev, flag) | |
| 16 | { | |
| 17 | ||
| 4460d508 | 18 | if(u.u_ttyp == NULL || (u.u_procp->p_flag&SDETACH)) { |
| 63c57592 BJ |
19 | u.u_error = ENXIO; |
| 20 | return; | |
| 21 | } | |
| 22 | (*cdevsw[major(u.u_ttyd)].d_open)(u.u_ttyd, flag); | |
| 23 | } | |
| 24 | ||
| 25 | /*ARGSUSED*/ | |
| 26 | syread(dev) | |
| 27 | { | |
| 28 | ||
| 4460d508 BJ |
29 | if (u.u_procp->p_flag&SDETACH) { |
| 30 | u.u_error = ENXIO; | |
| 31 | return; | |
| 32 | } | |
| 63c57592 BJ |
33 | (*cdevsw[major(u.u_ttyd)].d_read)(u.u_ttyd); |
| 34 | } | |
| 35 | ||
| 36 | /*ARGSUSED*/ | |
| 37 | sywrite(dev) | |
| 38 | { | |
| 39 | ||
| 4460d508 BJ |
40 | if (u.u_procp->p_flag&SDETACH) { |
| 41 | u.u_error = ENXIO; | |
| 42 | return; | |
| 43 | } | |
| 63c57592 BJ |
44 | (*cdevsw[major(u.u_ttyd)].d_write)(u.u_ttyd); |
| 45 | } | |
| 46 | ||
| 47 | /*ARGSUSED*/ | |
| 48 | syioctl(dev, cmd, addr, flag) | |
| 49 | caddr_t addr; | |
| 50 | { | |
| 51 | ||
| 4460d508 BJ |
52 | if (u.u_procp->p_flag&SDETACH) { |
| 53 | u.u_error = ENXIO; | |
| 54 | return; | |
| 55 | } | |
| 63c57592 BJ |
56 | (*cdevsw[major(u.u_ttyd)].d_ioctl)(u.u_ttyd, cmd, addr, flag); |
| 57 | } |