getaddr.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 63 行

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date	97.09.21.19.27.59;	author dls;	state Dist;
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@/* getaddr.c - getaddr, getiaddr */

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

/*------------------------------------------------------------------------
 *  getaddr - obtain this hosts's primary IP address
 *------------------------------------------------------------------------
 */
SYSCALL getaddr(ip)
IPaddr	ip;
{
	return getiaddr(NI_PRIMARY, ip);
}

/*------------------------------------------------------------------------
 *  getiaddr  -  obtain this interface's complete address (IP address)
 *------------------------------------------------------------------------
 */
IPaddr getiaddr(inum)
int	inum;
{
	struct netif	*pif;

	if (inum == NI_LOCAL || inum < 0 || inum >= Net.nif)
		return SYSERR;
	pif = &nif[inum];
	wait (rarpsem);
	if (!pif->ni_ivalid && pif->ni_state == NIS_UP) {
		rarpsend(inum);
	}
	signal(rarpsem);

	if (!pif->ni_ivalid)
		return SYSERR;
	return pif->ni_ip;
}
@