controlling terminal is a vnode

[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   7.5 (Berkeley) %G%
*/

/*
* Indirect driver for controlling tty.
*/
#include "param.h"
#include "systm.h"
#include "conf.h"
#include "user.h"
#include "ioctl.h"
#include "tty.h"
#include "proc.h"
#include "vnode.h"
#include "file.h"
#include "uio.h"

#define cttyvp(p) ((p)->p_flag&SCTTY ? (p)->p_session->s_ttyvp : NULL)

static off_t dummyoff;

/*ARGSUSED*/
syopen(dev, flag)
       dev_t dev;
       int flag;
{
       struct vnode *ttyvp = cttyvp(u.u_procp);
       int error;

       if (ttyvp == NULL)
               return (ENXIO);
       if (error = VOP_ACCESS(ttyvp,
          (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), u.u_cred))
               return (error);
       return (VOP_OPEN(ttyvp, flag, NOCRED));
}

/*ARGSUSED*/
syread(dev, uio, flag)
       dev_t dev;
       struct uio *uio;
{
       struct vnode *ttyvp = cttyvp(u.u_procp);

       if (ttyvp == NULL)
               return (ENXIO);
       return (VOP_READ(ttyvp, uio, &dummyoff, flag, NOCRED));
}

/*ARGSUSED*/
sywrite(dev, uio, flag)
       dev_t dev;
       struct uio *uio;
{
       struct vnode *ttyvp = cttyvp(u.u_procp);

       if (ttyvp == NULL)
               return (ENXIO);
       return (VOP_WRITE(ttyvp, uio, &dummyoff, flag, NOCRED));
}

/*ARGSUSED*/
syioctl(dev, cmd, addr, flag)
       dev_t dev;
       int cmd;
       caddr_t addr;
       int flag;
{
       struct vnode *ttyvp = cttyvp(u.u_procp);

       if (ttyvp == NULL)
               return (ENXIO);
       if (cmd == TIOCNOTTY) {
               if (!SESS_LEADER(u.u_procp)) {
                       u.u_procp->p_flag &= ~SCTTY;
                       return (0);
               } else
                       return (EINVAL);
       }
       return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED));
}

/*ARGSUSED*/
syselect(dev, flag)
       dev_t dev;
       int flag;
{
       struct vnode *ttyvp = cttyvp(u.u_procp);

       if (ttyvp == NULL)
               return (ENXIO);
       return (VOP_SELECT(ttyvp, flag, NOCRED));
}