Syntax and Semantic

If you ask "how do I get a video from Netflix to my TV screen?" you will probably get a variety of answers depending on whom you ask. Here are a TL;DR of the answers you are most likely to get: the home setting answer "your access point gets the video from the Netflix over the Internet and sends it over wifi to your TV"  the smart apps and video encoding answer "the Netflix app creates an HTTP request specifying your account and some chunks of the video you are about to watch and the Netflix server replies with HTTP responses that contain the chunks" the Internet Protocol (IP) answer "your smart TV creates packets addressed to the Netflix server by its IP address. Based on the IP address, the packets are first sent to the access point which sends it over fiber or telephone landlines to the Internet Service Provider (ISP), like AT&T, the ISP then sends it to other networks which eventually deliver it to Netflix (the ISP can also directly deliv...

wpa_supplicant is a popular cross platform tool for wifi network configuration. On linux kernel, wpa_supplicant can use NetLink ( nl80211 ) to pass commands and arguments to the configuration API of IEEE 802.11 (cfg80211). In this post, I will go through the different edits needed to pass arguments from userspace to mac80211 through wpa_supplicant. I will use my work on WiFi augmentation which allows wpa_supplicant to configure mac80211 to control its medium access control behavior. wpa_supplicant has two main components: wpa_supplicant daemon and the wpa_cli client program. The edits I will present will be in both the daemon and the client. My edits assumes the existence of some functions in kernel that the user of wpa_supplicant is attempting to invoke. The edit starts with the wpa_cli (client) code. The wpa_cli code maintains an array of all commands it can process mapped to callback functions that should be executed on the invocation of that command. The array can be foun...