unix-history:unix-v6:usr:sys:dmr:sys.c
Unix V6 /usr/sys/dmr/sys.c
/* * indirect driver for controlling tty. */ #include "../param.h" #include "../conf.h" #include "../user.h" #include "../tty.h" #include "../proc.h" syopen(dev, flag) { register *tp; if(tp = syttyp()) (*cdevsw[tp->t_dev.d_major].d_open)(tp->t_dev, flag); } syread(dev) { register *tp; if(tp = syttyp()) (*cdevsw[tp->t_dev.d_major].d_read)(tp->t_dev); } sywrite(dev) { register *tp; if(tp = syttyp()) (*cdevsw[tp->t_dev.d_major].d_write)(tp->t_dev); } sysgtty(dev, flag) { register *tp; if(tp = syttyp()) (*cdevsw[tp->t_dev.d_major].d_sgtty)(tp->t_dev, flag); } syttyp() { register tp; tp = u.u_procp->p_ttyp; if(tp == NULL) u.u_error = ENXIO; return(tp); }
unix-history/unix-v6/usr/sys/dmr/sys.c.txt ยท Last modified: 2006/07/26 07:34 by 127.0.0.1