/dev/tty takes flag and passes to line discipline, also -

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

/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
*      @(#)tty_tty.c   7.3 (Berkeley) %G%
*/

/*
* Indirect driver for controlling tty.
*
* THIS IS GARBAGE: MUST SOON BE DONE WITH struct inode * IN PROC TABLE.
*/
#include "param.h"
#include "systm.h"
#include "conf.h"
#include "dir.h"
#include "user.h"
#include "ioctl.h"
#include "tty.h"
#include "proc.h"
#include "uio.h"

/*ARGSUSED*/
syopen(dev, flag)
       dev_t dev;
       int flag;
{

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

/*ARGSUSED*/
syread(dev, uio, flag)
       dev_t dev;
       struct uio *uio;
{

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

/*ARGSUSED*/
sywrite(dev, uio, flag)
       dev_t dev;
       struct uio *uio;
{

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

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

       if (cmd == TIOCNOTTY) {
               if (SESS_LEADER(u.u_procp)) {
                       /* 
                        * XXX - check posix draft
                        */
                       u.u_ttyp->t_session = 0;
                       u.u_ttyp->t_pgid = 0;
               }
               u.u_ttyp = 0;
               u.u_ttyd = 0;
               return (0);
       }
       if (u.u_ttyp == NULL)
               return (ENXIO);
       return ((*cdevsw[major(u.u_ttyd)].d_ioctl)(u.u_ttyd, cmd, addr, flag));
}

/*ARGSUSED*/
syselect(dev, flag)
       dev_t dev;
       int flag;
{

       if (u.u_ttyp == NULL) {
               u.u_error = ENXIO;
               return (0);
       }
       return ((*cdevsw[major(u.u_ttyd)].d_select)(u.u_ttyd, flag));
}