ttyoin.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 110 行

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1.2
date	97.09.21.19.30.23;	author dls;	state Dist;
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next	1.1;

1.1
date	94.05.08.06.01.42;	author dls;	state Old;
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1.2
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@pre-3e code
@
text
@/* ttyoin.c - ttyoin */

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

/*------------------------------------------------------------------------
 * ttyoin - handle transmit interrupt on tty
 *------------------------------------------------------------------------
 */
int
ttyoin(ptty, ch)
struct tty	*ptty;
unsigned char	ch;
{
	kprintf("ttyoin\n");
}
@


1.1
log
@Initial revision
@
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@a5 5
#include <io.h>
#include <slu.h>
#include <zsreg.h>

extern char *foob1;
d8 1
a8 1
 *  ttyoin  --  lower-half tty device driver for output interrupts
d11 4
a14 2
INTPROC	ttyoin(iptr)
	register struct	tty   *iptr;
d16 1
a16 40
	STATWORD ps;    
	register struct	zscc_device	*zptr;
	int	ct;

	zptr = iptr->ioaddr;
	
        disable(ps);	

	if (iptr->ehead	!= iptr->etail)	{
		zptr->zscc_data = iptr->ebuff[iptr->etail++];
		if (iptr->etail	>= EBUFLEN)
			iptr->etail = 0;
		restore(ps);
		return;
	}
	if (iptr->oheld) {			/* honor flow control	*/
		ttyostop(iptr);
		restore(ps);
		return;
	}
	if ((ct=iptr->ocnt) > 0) {
		/**foob1++ = iptr->obuff[iptr->otail];*/
		zptr->zscc_data = iptr->obuff[iptr->otail++];
	        --iptr->ocnt;
		if (iptr->otail	>= OBUFLEN)
			iptr->otail = 0;
#ifdef NOTYET		
		if (ct > OBMINSP)
#endif		  
			signal(iptr->osem);
#ifdef NOTYET		
		else if	( ++(iptr->odsend) == OBMINSP) {
			iptr->odsend = 0;
			signaln(iptr->osem, OBMINSP);
		}
#endif			
	} else
	        ttyostop(iptr);

	restore(ps);
@