Function getchaninfo

tools/ifconfig/ifieee80211.c:231–245

* Collect channel info from the kernel. We use this (mostly) * to handle mapping between frequency and IEEE channel number. */

 * to handle mapping between frequency and IEEE channel number.
 */
static void
getchaninfo(int s)
{
	if (chaninfo != NULL)
		return;
	chaninfo = malloc(IEEE80211_CHANINFO_SIZE(MAXCHAN));
	if (chaninfo == NULL)
		errx(1, "no space for channel list");
	if (get80211(s, IEEE80211_IOC_CHANINFO, chaninfo,
	    IEEE80211_CHANINFO_SIZE(MAXCHAN)) < 0)
		err(1, "unable to get channel information");
	ifmr = ifmedia_getstate(s);
	gethtconf(s);
	getvhtconf(s);
}

static struct regdata *
getregdata(void)