libcamera: Rename 'method' to 'function'

Usage of 'method' to refer to member functions comes from Java. The C++
standard uses the term 'function' only. Replace 'method' with 'function'
or 'member function' through the whole code base and documentation.
While at it, fix two typos (s/backeng/backend/).

The BoundMethod and Object::invokeMethod() are left as-is here, and will
be addressed separately.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/ipc_unixsocket.cpp

@@ -58,7 +58,7 @@ LOG_DEFINE_CATEGORY(IPCUnixSocket)
  *
  * Establishment of an IPC channel is asymmetrical. The side that initiates
  * communication first instantiates a local side socket and creates the channel
- * with create(). The method returns a file descriptor for the remote side of
+ * with create(). The function returns a file descriptor for the remote side of
  * the channel, which is passed to the remote process through an out-of-band
  * communication method. The remote side then instantiates a socket, and binds
  * it to the other side by passing the file descriptor to bind(). At that point
@@ -80,11 +80,11 @@ IPCUnixSocket::~IPCUnixSocket()
 /**
  * \brief Create an new IPC channel
  *
- * This method creates a new IPC channel. The socket instance is bound to the
- * local side of the channel, and the method returns a file descriptor bound to
- * the remote side. The caller is responsible for passing the file descriptor to
- * the remote process, where it can be used with IPCUnixSocket::bind() to bind
- * the remote side socket.
+ * This function creates a new IPC channel. The socket instance is bound to the
+ * local side of the channel, and the function returns a file descriptor bound
+ * to the remote side. The caller is responsible for passing the file descriptor
+ * to the remote process, where it can be used with IPCUnixSocket::bind() to
+ * bind the remote side socket.
  *
  * \return A file descriptor on success, negative error code on failure
  */
@@ -112,9 +112,9 @@ int IPCUnixSocket::create()
  * \brief Bind to an existing IPC channel
  * \param[in] fd File descriptor
  *
- * This method binds the socket instance to an existing IPC channel identified
+ * This function binds the socket instance to an existing IPC channel identified
  * by the file descriptor \a fd. The file descriptor is obtained from the
- * IPCUnixSocket::create() method.
+ * IPCUnixSocket::create() function.
  *
  * \return 0 on success or a negative error code otherwise
  */
@@ -162,7 +162,7 @@ bool IPCUnixSocket::isBound() const
  * \brief Send a message payload
  * \param[in] payload Message payload to send
  *
- * This method queues the message payload for transmission to the other end of
+ * This function queues the message payload for transmission to the other end of
  * the IPC channel. It returns immediately, before the message is delivered to
  * the remote side.
  *
@@ -197,7 +197,7 @@ int IPCUnixSocket::send(const Payload &payload)
  * \brief Receive a message payload
  * \param[out] payload Payload where to write the received message
  *
- * This method receives the message payload from the IPC channel and writes it
+ * This function receives the message payload from the IPC channel and writes it
  * to the \a payload. If no message payload is available, it returns
  * immediately with -EAGAIN. The \ref readyRead signal shall be used to receive
  * notification of message availability.
@@ -329,7 +329,7 @@ void IPCUnixSocket::dataNotifier([[maybe_unused]] EventNotifier *notifier)
 	/*
 	 * If the payload has arrived, disable the notifier and emit the
 	 * readyRead signal. The notifier will be reenabled by the receive()
-	 * method.
+	 * function.
 	 */
 	struct pollfd fds = { fd_, POLLIN, 0 };
 	ret = poll(&fds, 1, 0);