2.11BSD#431 - /usr/src/sys/sys/tty_tty.c

   1: /*
   2:  * Copyright (c) 1986 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)tty_tty.c	1.2 (2.11BSD GTE) 11/29/94
   7:  */
   8: 
   9: /*
  10:  * Indirect driver for controlling tty.
  11:  *
  12:  */
  13: #include "param.h"
  14: #include "user.h"
  15: #include "proc.h"
  16: #include "ioctl.h"
  17: #include "tty.h"
  18: #include "conf.h"
  19: 
  20: /*ARGSUSED*/
  21: syopen(dev, flag)
  22:     dev_t dev;
  23:     int flag;
  24: {
  25:     if (u.u_ttyp == NULL)
  26:         return (ENXIO);
  27:     return((*cdevsw[major(u.u_ttyd)].d_open)(u.u_ttyd, flag));
  28: }
  29: 
  30: /*ARGSUSED*/
  31: syread(dev, uio, flag)
  32:     dev_t dev;
  33:     struct uio *uio;
  34:     int flag;
  35: {
  36:     if (u.u_ttyp == NULL)
  37:         return (ENXIO);
  38:     return ((*cdevsw[major(u.u_ttyd)].d_read)(u.u_ttyd, uio, flag));
  39: }
  40: 
  41: /*ARGSUSED*/
  42: sywrite(dev, uio, flag)
  43:     dev_t dev;
  44:     struct uio *uio;
  45: {
  46:     if (u.u_ttyp == NULL)
  47:         return (ENXIO);
  48:     return ((*cdevsw[major(u.u_ttyd)].d_write)(u.u_ttyd, uio, flag));
  49: }
  50: 
  51: /*ARGSUSED*/
  52: syioctl(dev, cmd, addr, flag)
  53:     dev_t dev;
  54:     u_int cmd;
  55:     caddr_t addr;
  56:     int flag;
  57: {
  58:     if (cmd == TIOCNOTTY) {
  59:         u.u_ttyp = 0;
  60:         u.u_ttyd = 0;
  61:         u.u_procp->p_pgrp = 0;
  62:         return (0);
  63:     }
  64:     if (u.u_ttyp == NULL)
  65:         return (ENXIO);
  66:     return ((*cdevsw[major(u.u_ttyd)].d_ioctl)(u.u_ttyd, cmd, addr, flag));
  67: }
  68: 
  69: /*ARGSUSED*/
  70: syselect(dev, flag)
  71:     dev_t dev;
  72:     int flag;
  73: {
  74: 
  75:     if (u.u_ttyp == NULL) {
  76:         u.u_error = ENXIO;
  77:         return (0);
  78:     }
  79:     return ((*cdevsw[major(u.u_ttyd)].d_select)(u.u_ttyd, flag));
  80: }

Defined functions