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-\page hostapd_ctrl_iface_page hostapd control interface
-hostapd implements a control interface that can be used by
-external programs to control the operations of the hostapd
-daemon and to get status information and event notifications. There is
-a small C library, in a form of a single C file, wpa_ctrl.c, that
-provides helper functions to facilitate the use of the control
-interface. External programs can link this file into them and then use
-the library functions documented in wpa_ctrl.h to interact with
-%wpa_supplicant. This library can also be used with C++. hostapd_cli.c
-is an example program using this library.
-There are multiple mechanisms for inter-process communication. For
-example, Linux version of hostapd is using UNIX domain sockets for the
-control interface. The use of the functions defined in wpa_ctrl.h can
-be used to hide the details of the used IPC from external programs.
-\section using_ctrl_iface Using the control interface
-External programs, e.g., a GUI or a configuration utility, that need to
-communicate with hostapd should link in wpa_ctrl.c. This
-allows them to use helper functions to open connection to the control
-interface with wpa_ctrl_open() and to send commands with
-hostapd uses the control interface for two types of communication:
-commands and unsolicited event messages. Commands are a pair of
-messages, a request from the external program and a response from
-hostapd. These can be executed using wpa_ctrl_request().
-Unsolicited event messages are sent by hostapd to the control
-interface connection without specific request from the external program
-for receiving each message. However, the external program needs to
-attach to the control interface with wpa_ctrl_attach() to receive these
-unsolicited messages.
-If the control interface connection is used both for commands and
-unsolicited event messages, there is potential for receiving an
-unsolicited message between the command request and response.
-wpa_ctrl_request() caller will need to supply a callback, msg_cb,
-for processing these messages. Often it is easier to open two
-control interface connections by calling wpa_ctrl_open() twice and
-then use one of the connections for commands and the other one for
-unsolicited messages. This way command request/response pairs will
-not be broken by unsolicited messages. wpa_cli is an example of how
-to use only one connection for both purposes and wpa_gui demonstrates
-how to use two separate connections.
-Once the control interface connection is not needed anymore, it should
-be closed by calling wpa_ctrl_close(). If the connection was used for
-unsolicited event messages, it should be first detached by calling
-\section ctrl_iface_cmds Control interface commands
-Following commands can be used with wpa_ctrl_request():
-\subsection ctrl_iface_PING PING
-This command can be used to test whether hostapd is replying
-to the control interface commands. The expected reply is \c PONG if the
-connection is open and hostapd is processing commands.