?? sys.c
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#/* *//* * 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);}?? 快捷鍵說明
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