title: obtaining received signal strength of neighboring devices
body: <p>I use AR9271 chipset usb WiFi device on Debian 7 on kernel 3.12.rc5. I use <code>ath9k_htc</code> and <code>nl80211</code> drivers. </p>
  
  <p>I create an ad-hoc WLAN via <code>wpa_supplicant 2.0</code> and I would like to obtain received signal strength of the neighboring device in a C program. </p>
  
  <p>What function or API can I use to obtain that information?</p>