/* ttyopen.c - ttyopen */

#include <conf.h>
#include <kernel.h>
#include <tty.h>

/*------------------------------------------------------------------------
 * ttyopen - associate a tty with a hardware device
 *------------------------------------------------------------------------
 */
int ttyopen(pdev, dvnum)
struct devsw	*pdev;
int		dvnum;
{
    struct tty	*ptty, *ttynew();

    if (pdev->dvioblk)	/* already open */
	if (ptty->tty_iflags & TIF_EXCLUSIVE)
	    return SYSERR;
	else
	    return OK;
    
    ptty = ttynew();
    if (ptty == 0)
	return SYSERR;
    
    pdev->dvioblk = (char *)ptty;
    ptty->tty_pdev = (struct devsw *)pdev;
    ptty->tty_phw = (struct devsw *)&devtab[dvnum];
    devtab[dvnum].dvioblk = (char *)pdev;
    ptty->tty_iflags = ptty->tty_oflags = 0;
    ptty->tty_uid = -1;
    return OK;
}