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Test Your Knowledge in Computers #280
Difficulty: Easy
CPU modes (also called processor modes, CPU states, CPU privilege levels and other names) are operating modes for the central processing unit of some computer architectures that place restrictions on the type and scope of operations that can be performed by certain processes being run by the CPU.
True or False?
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ieee80211_get_channel(9) [centos man page]

IEEE80211_GET_CHANNE(9) 					 Utility functions					   IEEE80211_GET_CHANNE(9)

NAME
ieee80211_get_channel - get channel struct from wiphy for specified frequency SYNOPSIS
struct ieee80211_channel * ieee80211_get_channel(struct wiphy * wiphy, int freq); ARGUMENTS
wiphy the struct wiphy to get the channel for freq the center frequency of the channel RETURN
The channel struct from wiphy at freq. AUTHOR
Johannes Berg <johannes@sipsolutions.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 IEEE80211_GET_CHANNE(9)

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STRUCT 
CFG80211_BSS(9) Scanning and BSS list handling STRUCT CFG80211_BSS(9) NAME
struct_cfg80211_bss - BSS description SYNOPSIS
struct cfg80211_bss { struct ieee80211_channel * channel; const struct cfg80211_bss_ies __rcu * ies; const struct cfg80211_bss_ies __rcu * beacon_ies; const struct cfg80211_bss_ies __rcu * proberesp_ies; struct cfg80211_bss * hidden_beacon_bss; s32 signal; u16 beacon_interval; u16 capability; u8 bssid[ETH_ALEN]; u8 priv[0]; }; MEMBERS
channel channel this BSS is on ies the information elements (Note that there is no guarantee that these are well-formed!); this is a pointer to either the beacon_ies or proberesp_ies depending on whether Probe Response frame has been received. It is always non-NULL. beacon_ies the information elements from the last Beacon frame (implementation note: if hidden_beacon_bss is set this struct doesn't own the beacon_ies, but they're just pointers to the ones from the hidden_beacon_bss struct) proberesp_ies the information elements from the last Probe Response frame hidden_beacon_bss in case this BSS struct represents a probe response from a BSS that hides the SSID in its beacon, this points to the BSS struct that holds the beacon data. beacon_ies is still valid, of course, and points to the same data as hidden_beacon_bss->beacon_ies in that case. signal signal strength value (type depends on the wiphy's signal_type) beacon_interval the beacon interval as from the frame capability the capability field in host byte order bssid[ETH_ALEN] BSSID of the BSS priv[0] private area for driver use, has at least wiphy->bss_priv_size bytes DESCRIPTION
This structure describes a BSS (which may also be a mesh network) for use in scan results and similar. AUTHOR
Johannes Berg <johannes@sipsolutions.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT CFG80211_BSS(9)

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