dgcntl.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 63 行

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date	97.09.21.19.25.42;	author dls;	state Dist;
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@/* dgcntl.c - dgcntl */

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

/*------------------------------------------------------------------------
 *  dgcntl  -  control function for datagram pseudo-devices
 *------------------------------------------------------------------------
 */
dgcntl(devptr, func, arg)
struct	devsw	*devptr;
int		func;
int		arg;
{
	STATWORD	ps;    
	struct	dgblk	*dgptr;
	int		ret, freebuf();

	disable(ps);
	dgptr = (struct dgblk *)devptr->dvioblk;
	ret = OK;
	switch (func) {

		case DG_SETMODE:	/* set mode bits */
			dgptr->dg_mode = arg;
			break;

		case DG_CLEAR:		/* clear queued packets */
			preset(dgptr->dg_xport, freebuf);
			break;

		default:
			ret = SYSERR;
	}
	restore(ps);
	return(ret);
}
@