hglookup.c

来自「TCP-IP红宝书源代码」· C语言 代码 · 共 29 行

/* hglookup.c - hglookup */

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

/*------------------------------------------------------------------------
 *  hglookup  -  get host group entry (if any) for a group
 * 	N.B. - Assumes HostGroup.hi_mutex *held*
 *------------------------------------------------------------------------
 */
struct hg *
hglookup(unsigned ifnum, IPaddr ipa)
{
	struct hg	*phg;
	int		i;

	
	phg = &hgtable[0];
	for (i=0; i < HG_TSIZE; ++i, ++phg) {
		if (phg->hg_state == HGS_FREE)
			continue;
		if (ifnum == phg->hg_ifnum && ipa == phg->hg_ipa)
			return phg;
	}
	return 0;
}