iw: show age of last scan

Commit Message

Holger Schurig Sept. 24, 2009, 9:20 a.m. UTC

This shows how old a scan result entry is.

---

Example:

# ./iw eth1 scan trigger freq 2412
# sleep 1
# ./iw eth1 scan dump | grep seen
        last seen: 832 ms ago
        last seen: 852 ms ago
        last seen: 852 ms ago
# sleep 1
# ./iw eth1 scan dump | grep seen
        last seen: 1836 ms ago
        last seen: 1856 ms ago
        last seen: 1856 ms ago

Patch

Index: iw/scan.c
===================================================================
--- iw.orig/scan.c	2009-09-21 14:06:47.000000000 +0200
+++ iw/scan.c	2009-09-24 09:57:02.000000000 +0200
@@ -754,6 +754,7 @@  static int print_bss_handler(struct nl_m
 		[NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
 		[NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
 		[NL80211_BSS_STATUS] = { .type = NLA_U32 },
+		[NL80211_BSS_AGE_MS] = { .type = NLA_U32 },
 	};
 	struct scan_params *params = arg;
 
@@ -845,6 +846,10 @@  static int print_bss_handler(struct nl_m
 		unsigned char s = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
 		printf("\tsignal: %d/100\n", s);
 	}
+	if (bss[NL80211_BSS_AGE_MS]) {
+		int age = nla_get_u32(bss[NL80211_BSS_AGE_MS]);
+		printf("\tlast seen: %d ms ago\n", age);
+	}
 	if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
 		print_ies(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
 			  nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
Index: iw/nl80211.h
===================================================================
--- iw.orig/nl80211.h	2009-09-24 09:55:57.000000000 +0200
+++ iw/nl80211.h	2009-09-24 09:56:29.000000000 +0200
@@ -1261,6 +1261,7 @@  enum nl80211_channel_type {
  * @NL80211_BSS_SIGNAL_UNSPEC: signal strength of the probe response/beacon
  *	in unspecified units, scaled to 0..100 (u8)
  * @NL80211_BSS_STATUS: status, if this BSS is "used"
+ * @NL80211_BSS_AGE_MS: age of this BSS entry in ms
  * @__NL80211_BSS_AFTER_LAST: internal
  * @NL80211_BSS_MAX: highest BSS attribute
  */
@@ -1275,6 +1276,7 @@  enum nl80211_bss {
 	NL80211_BSS_SIGNAL_MBM,
 	NL80211_BSS_SIGNAL_UNSPEC,
 	NL80211_BSS_STATUS,
+	NL80211_BSS_AGE_MS,
 
 	/* keep last */
 	__NL80211_BSS_AFTER_LAST,