comiin.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 54 行

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1.1
date	97.09.21.19.23.38;	author dls;	state Dist;
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@pre-3e code
@


1.1
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@Initial revision
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@/* comiin.c comiin */

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

static	int	state;

/*------------------------------------------------------------------------
 *  comiin  --  lower-half com device driver for input interrupts
 *------------------------------------------------------------------------
 */
INTPROC	comiin(pcom)
struct comsoft	*pcom;
{
	struct devsw	*pdev = pcom->com_pdev;
	unsigned int	ch;

	ch = inb(pdev->dvcsr + DATA);
	if (pdev->dvioblk == 0)
		return OK;		/* no tty device associated */
	pdev = (struct devsw *)pdev->dvioblk;	/* get tty dev pointer */
	if (pdev == 0)
		return OK;		/* no tty structure associated */
	(pdev->dviint)(pdev, ch);
	return OK;
}
@