[unix-history] / usr / src / sys / kern / tty_tty.c

/*      tty_tty.c       3.2     %G%     */

/*
*      indirect driver for controlling tty.
*/
#include "../h/param.h"
#include "../h/systm.h"
#include "../h/conf.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/tty.h"
#include "../h/proc.h"

/*ARGSUSED*/
syopen(dev, flag)
{

       if(u.u_ttyp == NULL) {
               u.u_error = ENXIO;
               return;
       }
       (*cdevsw[major(u.u_ttyd)].d_open)(u.u_ttyd, flag);
}

/*ARGSUSED*/
syread(dev)
{

       (*cdevsw[major(u.u_ttyd)].d_read)(u.u_ttyd);
}

/*ARGSUSED*/
sywrite(dev)
{

       (*cdevsw[major(u.u_ttyd)].d_write)(u.u_ttyd);
}

/*ARGSUSED*/
syioctl(dev, cmd, addr, flag)
caddr_t addr;
{

       (*cdevsw[major(u.u_ttyd)].d_ioctl)(u.u_ttyd, cmd, addr, flag);
}